/* =========================================================
   GRAPHING LAB
   ========================================================= */

:root
{
    --gl-navy: #102a43;
    --gl-navy-dark: #081c2f;
    --gl-blue: #1f6f8b;
    --gl-teal: #159a9c;
    --gl-teal-dark: #117b7d;
    --gl-green: #198754;
    --gl-red: #c0392b;
    --gl-orange: #d97706;
    --gl-purple: #6f42c1;

    --gl-light: #f5f8fb;
    --gl-lighter: #fbfcfe;
    --gl-white: #ffffff;

    --gl-border: #dbe5ee;
    --gl-border-dark: #c6d5e1;

    --gl-text: #243b53;
    --gl-muted: #627d98;
    --gl-muted-light: #829ab1;

    --gl-shadow:
        0 18px 45px rgba(16, 42, 67, 0.11);

    --gl-shadow-small:
        0 8px 24px rgba(16, 42, 67, 0.08);

    --gl-shadow-control:
        0 4px 14px rgba(16, 42, 67, 0.10);

    --gl-expression-1: #159a9c;
    --gl-expression-2: #6f42c1;
    --gl-expression-3: #d97706;
    --gl-expression-4: #c0392b;
    --gl-expression-5: #1f6f8b;
    --gl-expression-6: #198754;
}


/* =========================================================
   GENERAL PAGE
   ========================================================= */

.graphing-lab-page
{
    margin: 0;
    background: var(--gl-white);
    color: var(--gl-text);
    font-family: "Inter", sans-serif;
}

.graphing-lab-page *,
.graphing-lab-page *::before,
.graphing-lab-page *::after
{
    box-sizing: border-box;
}

.graphing-lab-page button,
.graphing-lab-page input,
.graphing-lab-page select,
.graphing-lab-page textarea
{
    font-family: inherit;
}

.graphing-lab-page button
{
    cursor: pointer;
}

.graphing-lab-page button:disabled
{
    cursor: not-allowed;
}

.gl-page-container
{
    width: min(100%, 1520px);
    margin: 0 auto;
    padding-left: clamp(1rem, 3vw, 2.5rem);
    padding-right: clamp(1rem, 3vw, 2.5rem);
}


/* =========================================================
   COMPACT HERO
   ========================================================= */

.gl-hero
{
    position: relative;
    overflow: hidden;
    padding: 3.25rem 0 2.9rem;
    background:
        radial-gradient(
            circle at 12% 0%,
            rgba(21, 154, 156, 0.18),
            transparent 32rem
        ),
        linear-gradient(
            135deg,
            var(--gl-navy-dark) 0%,
            var(--gl-navy) 55%,
            #123b52 100%
        );
    color: var(--gl-white);
}

.gl-hero::after
{
    content: "";
    position: absolute;
    right: -110px;
    bottom: -170px;
    width: 420px;
    height: 420px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    box-shadow:
        0 0 0 55px rgba(255, 255, 255, 0.025),
        0 0 0 110px rgba(255, 255, 255, 0.018);
    pointer-events: none;
}

.gl-hero-content
{
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 3rem;
}

.gl-hero-copy
{
    max-width: 820px;
}

.gl-eyebrow
{
    margin: 0 0 0.55rem;
    color: var(--gl-teal-dark);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.gl-hero .gl-eyebrow
{
    color: #75d9da;
}

.gl-hero h1
{
    margin: 0 0 0.8rem;
    color: var(--gl-white);
    font-size: clamp(2.3rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.03em;
}

.gl-hero-description
{
    max-width: 760px;
    margin: 0;
    color: #d6e3ec;
    font-size: clamp(1rem, 2vw, 1.12rem);
    line-height: 1.75;
}

.gl-hero-actions
{
    flex: 0 0 auto;
}


/* =========================================================
   GRAPHING LAB SECTION
   ========================================================= */

.gl-section
{
    position: relative;
    padding: clamp(2rem, 5vw, 4.5rem) 0;
    background:
        radial-gradient(
            circle at top left,
            rgba(21, 154, 156, 0.07),
            transparent 34rem
        ),
        linear-gradient(
            180deg,
            #ffffff 0%,
            #f5f8fb 100%
        );
}


/* =========================================================
   APP SHELL
   ========================================================= */

.gl-app
{
    width: 100%;
    overflow: hidden;
    border: 1px solid rgba(198, 213, 225, 0.92);
    border-radius: 1.35rem;
    background: var(--gl-white);
    box-shadow: var(--gl-shadow);
}


/* =========================================================
   APPLICATION HEADER
   ========================================================= */

.gl-app-header
{
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    min-height: 88px;
    padding: 1.15rem 1.45rem;
    border-bottom: 1px solid var(--gl-border);
    background:
        linear-gradient(
            180deg,
            #ffffff 0%,
            #fbfcfe 100%
        );
}

.gl-app-heading
{
    display: flex;
    align-items: center;
    gap: 1rem;
}

.gl-app-eyebrow
{
    margin: 0 0 0.2rem;
    color: var(--gl-teal-dark);
    font-size: 0.7rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.gl-app-heading h2
{
    margin: 0;
    color: var(--gl-navy);
    font-size: clamp(1.25rem, 2vw, 1.55rem);
    font-weight: 800;
    line-height: 1.2;
}


/* =========================================================
   2D / 3D MODE SWITCHER
   ========================================================= */

.gl-mode-switcher
{
    display: inline-flex;
    align-items: stretch;
    gap: 0.25rem;
    padding: 0.3rem;
    border: 1px solid var(--gl-border);
    border-radius: 0.8rem;
    background: var(--gl-light);
}

.gl-mode-button
{
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    min-height: 38px;
    padding: 0.45rem 0.85rem;
    border: 0;
    border-radius: 0.6rem;
    background: transparent;
    color: var(--gl-muted);
    font-size: 0.82rem;
    font-weight: 800;
    transition:
        background-color 0.2s ease,
        color 0.2s ease,
        box-shadow 0.2s ease;
}

.gl-mode-button.is-active
{
    background: var(--gl-white);
    color: var(--gl-teal-dark);
    box-shadow: 0 3px 9px rgba(16, 42, 67, 0.09);
}

.gl-mode-button:disabled
{
    opacity: 0.68;
}

.gl-coming-soon
{
    padding: 0.2rem 0.42rem;
    border-radius: 999px;
    background: rgba(98, 125, 152, 0.12);
    color: var(--gl-muted);
    font-size: 0.62rem;
    font-weight: 800;
    white-space: nowrap;
}


/* =========================================================
   MAIN WORKSPACE
   ========================================================= */

.gl-workspace
{
    display: grid;
    grid-template-columns: 390px minmax(0, 1fr);
    min-height: 680px;
    background: var(--gl-white);
}


/* =========================================================
   EXPRESSION SIDEBAR
   ========================================================= */

.gl-expression-panel
{
    position: relative;
    display: flex;
    flex-direction: column;
    min-width: 0;
    border-right: 1px solid var(--gl-border);
    background:
        linear-gradient(
            180deg,
            #ffffff 0%,
            #fbfcfe 100%
        );
}

.gl-expression-panel-header
{
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.25rem 1.2rem 1rem;
    border-bottom: 1px solid var(--gl-border);
}

.gl-panel-label
{
    display: block;
    margin-bottom: 0.3rem;
    color: var(--gl-navy);
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.gl-expression-panel-header p,
.gl-panel-heading-row p
{
    margin: 0;
    color: var(--gl-muted);
    font-size: 0.78rem;
    line-height: 1.5;
}

.gl-expression-list
{
    flex: 1 1 auto;
}


/* =========================================================
   EXPRESSION ROW
   ========================================================= */

.gl-expression-row
{
    position: relative;
    border-bottom: 1px solid var(--gl-border);
    background: var(--gl-white);
    transition:
        background-color 0.2s ease,
        box-shadow 0.2s ease;
}

.gl-expression-row:hover
{
    background: #fbfdff;
}

.gl-expression-row.is-active
{
    background:
        linear-gradient(
            90deg,
            rgba(21, 154, 156, 0.055),
            rgba(21, 154, 156, 0.015)
        );
}

.gl-expression-row.is-active::before
{
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 4px;
    background: var(--gl-teal);
}

.gl-expression-row-main
{
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem 0.9rem 1rem 1rem;
}

.gl-expression-color
{
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    width: 28px;
    height: 34px;
    padding: 0;
    border: 0;
    background: transparent;
}

.gl-color-dot
{
    display: block;
    width: 15px;
    height: 15px;
    border: 2px solid rgba(255, 255, 255, 0.96);
    border-radius: 50%;
    box-shadow:
        0 0 0 1px rgba(16, 42, 67, 0.14),
        0 2px 6px rgba(16, 42, 67, 0.12);
}

.gl-color-1
{
    background: var(--gl-expression-1);
}

.gl-color-2
{
    background: var(--gl-expression-2);
}

.gl-color-3
{
    background: var(--gl-expression-3);
}

.gl-color-4
{
    background: var(--gl-expression-4);
}

.gl-color-5
{
    background: var(--gl-expression-5);
}

.gl-color-6
{
    background: var(--gl-expression-6);
}

.gl-expression-content
{
    min-width: 0;
}

.gl-math-input-wrap
{
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    gap: 0.6rem;
}

.gl-expression-number
{
    color: var(--gl-muted-light);
    font-size: 0.72rem;
    font-weight: 800;
}

.gl-expression-input
{
    width: 100%;
    min-width: 0;
    min-height: 40px;
    padding: 0.35rem 0.4rem;
    border: 0;
    border-bottom: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    color: var(--gl-navy-dark);
    font-size: 1.12rem;
    font-weight: 650;
    line-height: 1.4;
    outline: none;
    transition:
        border-color 0.2s ease,
        background-color 0.2s ease;
}

.gl-expression-input:hover
{
    background: rgba(16, 42, 67, 0.025);
}

.gl-expression-input:focus
{
    border-bottom-color: var(--gl-teal);
    background: rgba(21, 154, 156, 0.035);
}

.gl-expression-meta
{
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.65rem;
    margin-top: 0.45rem;
    padding-left: 1.45rem;
}

.gl-expression-type
{
    color: var(--gl-muted);
    font-size: 0.72rem;
    font-weight: 700;
}

.gl-inline-action
{
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--gl-teal-dark);
    font-size: 0.72rem;
    font-weight: 800;
}

.gl-inline-action:hover
{
    color: var(--gl-navy);
    text-decoration: underline;
}

.gl-expression-error
{
    margin-top: 0.55rem;
    margin-left: 1.45rem;
    padding: 0.55rem 0.65rem;
    border: 1px solid rgba(192, 57, 43, 0.18);
    border-radius: 0.55rem;
    background: rgba(192, 57, 43, 0.055);
    color: #922b21;
    font-size: 0.72rem;
    font-weight: 650;
    line-height: 1.45;
}

.gl-expression-error[hidden]
{
    display: none !important;
}

.gl-expression-actions
{
    display: flex;
    align-items: center;
    gap: 0.2rem;
}


/* =========================================================
   ICON BUTTONS
   ========================================================= */

.gl-icon-button
{
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    flex: 0 0 auto;
    padding: 0;
    border: 0;
    border-radius: 0.55rem;
    background: transparent;
    color: var(--gl-muted);
    transition:
        background-color 0.2s ease,
        color 0.2s ease,
        transform 0.2s ease;
}

.gl-icon-button svg
{
    width: 17px;
    height: 17px;
}

.gl-icon-button:hover
{
    background: rgba(16, 42, 67, 0.06);
    color: var(--gl-navy);
}

.gl-icon-button:active
{
    transform: scale(0.96);
}

.gl-icon-button:focus-visible,
.gl-toolbar-button:focus-visible,
.gl-graph-control-button:focus-visible,
.gl-learning-button:focus-visible,
.gl-add-expression-button:focus-visible,
.gl-sidebar-utility-button:focus-visible,
.gl-test-point-floating-button:focus-visible,
.gl-mode-button:focus-visible
{
    outline: 3px solid rgba(21, 154, 156, 0.22);
    outline-offset: 2px;
}

.gl-visibility-button.is-visible
{
    color: var(--gl-teal-dark);
}


/* =========================================================
   ADD EXPRESSION AREA
   ========================================================= */

.gl-expression-add-area
{
    padding: 0.9rem 1rem;
    border-bottom: 1px solid var(--gl-border);
}

.gl-add-expression-button
{
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.55rem;
    width: 100%;
    min-height: 44px;
    padding: 0.7rem 1rem;
    border: 1px dashed #aac2d3;
    border-radius: 0.7rem;
    background: rgba(21, 154, 156, 0.035);
    color: var(--gl-teal-dark);
    font-size: 0.82rem;
    font-weight: 800;
    transition:
        border-color 0.2s ease,
        background-color 0.2s ease,
        color 0.2s ease;
}

.gl-add-expression-button svg
{
    width: 17px;
    height: 17px;
}

.gl-add-expression-button:hover
{
    border-color: var(--gl-teal);
    background: rgba(21, 154, 156, 0.075);
}


/* =========================================================
   SIDEBAR UTILITIES
   ========================================================= */

.gl-expression-utilities
{
    display: flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.8rem 0.9rem;
    margin-top: auto;
    border-top: 1px solid var(--gl-border);
    background: var(--gl-lighter);
}

.gl-sidebar-utility-button
{
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    flex: 1 1 0;
    min-height: 38px;
    padding: 0.5rem 0.65rem;
    border: 1px solid var(--gl-border);
    border-radius: 0.6rem;
    background: var(--gl-white);
    color: var(--gl-muted);
    font-size: 0.72rem;
    font-weight: 750;
}

.gl-sidebar-utility-button svg
{
    width: 15px;
    height: 15px;
}

.gl-sidebar-utility-button:hover
{
    border-color: rgba(21, 154, 156, 0.45);
    color: var(--gl-teal-dark);
}


/* =========================================================
   GRAPH AREA
   ========================================================= */

.gl-graph-area
{
    position: relative;
    min-width: 0;
    overflow: hidden;
    background: var(--gl-white);
}

.gl-graph-toolbar
{
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    min-height: 54px;
    padding: 0.6rem 0.8rem;
    border-bottom: 1px solid var(--gl-border);
    background: rgba(251, 252, 254, 0.96);
}

.gl-graph-toolbar-left,
.gl-graph-toolbar-right
{
    display: flex;
    align-items: center;
    gap: 0.45rem;
}

.gl-toolbar-button
{
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    min-height: 36px;
    padding: 0.48rem 0.7rem;
    border: 1px solid var(--gl-border);
    border-radius: 0.6rem;
    background: var(--gl-white);
    color: var(--gl-navy);
    font-size: 0.72rem;
    font-weight: 750;
    box-shadow: 0 2px 7px rgba(16, 42, 67, 0.045);
    transition:
        border-color 0.2s ease,
        background-color 0.2s ease,
        color 0.2s ease;
}

.gl-toolbar-button svg
{
    width: 16px;
    height: 16px;
}

.gl-toolbar-button:hover
{
    border-color: rgba(21, 154, 156, 0.45);
    background: rgba(21, 154, 156, 0.045);
    color: var(--gl-teal-dark);
}

.gl-mobile-expression-toggle
{
    display: none;
}


/* =========================================================
   GRAPH VIEWPORT
   ========================================================= */

.gl-graph-viewport
{
    position: relative;
    width: 100%;
    height: 625px;
    overflow: hidden;
    background: #ffffff;
    touch-action: none;
}

.gl-graph-board
{
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    background: #ffffff;
}

.gl-graph-board svg,
.gl-graph-board canvas
{
    display: block;
    width: 100%;
    height: 100%;
}


/* =========================================================
   GRAPH LOADING / STATUS
   ========================================================= */

.gl-graph-status
{
    position: absolute;
    top: 50%;
    left: 50%;
    z-index: 4;
    transform: translate(-50%, -50%);
    padding: 0.75rem 1rem;
    border: 1px solid var(--gl-border);
    border-radius: 0.75rem;
    background: rgba(255, 255, 255, 0.94);
    color: var(--gl-muted);
    font-size: 0.82rem;
    font-weight: 700;
    box-shadow: var(--gl-shadow-small);
    pointer-events: none;
}


/* =========================================================
   COORDINATE READOUT
   ========================================================= */

.gl-coordinate-readout
{
    position: absolute;
    top: 0.85rem;
    left: 0.85rem;
    z-index: 5;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    min-height: 34px;
    padding: 0.4rem 0.65rem;
    border: 1px solid rgba(198, 213, 225, 0.95);
    border-radius: 0.6rem;
    background: rgba(255, 255, 255, 0.94);
    color: var(--gl-muted);
    font-size: 0.72rem;
    box-shadow: var(--gl-shadow-control);
    backdrop-filter: blur(7px);
}

.gl-coordinate-readout strong
{
    color: var(--gl-navy);
    font-size: 0.75rem;
}

.gl-coordinate-readout[hidden]
{
    display: none !important;
}


/* =========================================================
   ZOOM CONTROLS
   ========================================================= */

.gl-zoom-controls
{
    position: absolute;
    right: 0.9rem;
    bottom: 0.9rem;
    z-index: 5;
    display: grid;
    gap: 0.35rem;
}

.gl-graph-control-button
{
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    padding: 0;
    border: 1px solid rgba(198, 213, 225, 0.95);
    border-radius: 0.65rem;
    background: rgba(255, 255, 255, 0.96);
    color: var(--gl-navy);
    box-shadow: var(--gl-shadow-control);
    transition:
        border-color 0.2s ease,
        background-color 0.2s ease,
        color 0.2s ease,
        transform 0.2s ease;
}

.gl-graph-control-button svg
{
    width: 19px;
    height: 19px;
}

.gl-graph-control-button:hover
{
    border-color: rgba(21, 154, 156, 0.55);
    color: var(--gl-teal-dark);
    transform: translateY(-1px);
}


/* =========================================================
   TEST A POINT FLOATING CONTROL
   ========================================================= */

.gl-test-point-floating-button
{
    position: absolute;
    left: 0.9rem;
    bottom: 0.9rem;
    z-index: 5;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    min-height: 42px;
    padding: 0.65rem 0.85rem;
    border: 1px solid rgba(21, 154, 156, 0.38);
    border-radius: 0.7rem;
    background: rgba(255, 255, 255, 0.96);
    color: var(--gl-teal-dark);
    font-size: 0.76rem;
    font-weight: 800;
    box-shadow: var(--gl-shadow-control);
    transition:
        background-color 0.2s ease,
        color 0.2s ease,
        border-color 0.2s ease,
        transform 0.2s ease;
}

.gl-test-point-floating-button svg
{
    width: 17px;
    height: 17px;
}

.gl-test-point-floating-button:hover
{
    background: rgba(21, 154, 156, 0.07);
    transform: translateY(-1px);
}

.gl-test-point-floating-button[aria-pressed="true"]
{
    border-color: var(--gl-teal);
    background: var(--gl-teal);
    color: var(--gl-white);
}


/* =========================================================
   GRAPH SETTINGS
   ========================================================= */

.gl-settings-panel
{
    position: absolute;
    top: 64px;
    right: 1rem;
    z-index: 20;
    width: min(360px, calc(100% - 2rem));
    padding: 1rem;
    border: 1px solid var(--gl-border);
    border-radius: 0.85rem;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--gl-shadow);
    backdrop-filter: blur(10px);
}

.gl-settings-panel[hidden]
{
    display: none !important;
}

.gl-panel-heading-row
{
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    padding-bottom: 0.8rem;
    border-bottom: 1px solid var(--gl-border);
}

.gl-settings-grid
{
    display: grid;
    gap: 0.25rem;
    padding-top: 0.75rem;
}

.gl-switch-row
{
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    min-height: 42px;
    padding: 0.45rem 0.3rem;
    color: var(--gl-navy);
    font-size: 0.79rem;
    font-weight: 700;
    cursor: pointer;
}

.gl-switch-row input
{
    width: 18px;
    height: 18px;
    accent-color: var(--gl-teal);
}


/* =========================================================
   LEARNING BAR
   ========================================================= */

.gl-learning-bar
{
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    padding: 1rem 1.2rem;
    border-top: 1px solid var(--gl-border);
    background:
        linear-gradient(
            90deg,
            rgba(21, 154, 156, 0.045),
            rgba(31, 111, 139, 0.03)
        );
}

.gl-learning-bar-copy
{
    display: flex;
    align-items: center;
    gap: 0.8rem;
    min-width: 0;
}

.gl-learning-icon
{
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    width: 40px;
    height: 40px;
    border-radius: 0.75rem;
    background: rgba(21, 154, 156, 0.1);
    color: var(--gl-teal-dark);
}

.gl-learning-icon svg
{
    width: 19px;
    height: 19px;
}

.gl-learning-bar-copy strong
{
    display: block;
    margin-bottom: 0.15rem;
    color: var(--gl-navy);
    font-size: 0.84rem;
    font-weight: 800;
}

.gl-learning-bar-copy span
{
    display: block;
    color: var(--gl-muted);
    font-size: 0.75rem;
    line-height: 1.45;
}

.gl-learning-actions
{
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.5rem;
}

.gl-learning-button
{
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    min-height: 40px;
    padding: 0.55rem 0.78rem;
    border: 1px solid var(--gl-border);
    border-radius: 0.65rem;
    background: var(--gl-white);
    color: var(--gl-navy);
    font-size: 0.74rem;
    font-weight: 800;
    transition:
        border-color 0.2s ease,
        background-color 0.2s ease,
        color 0.2s ease,
        transform 0.2s ease;
}

.gl-learning-button svg
{
    width: 16px;
    height: 16px;
}

.gl-learning-button:hover
{
    border-color: rgba(21, 154, 156, 0.5);
    background: rgba(21, 154, 156, 0.055);
    color: var(--gl-teal-dark);
    transform: translateY(-1px);
}

.gl-learning-button-primary
{
    border-color: transparent;
    background:
        linear-gradient(
            135deg,
            var(--gl-teal),
            var(--gl-blue)
        );
    color: var(--gl-white);
    box-shadow: 0 7px 18px rgba(21, 154, 156, 0.2);
}

.gl-learning-button-primary:hover
{
    border-color: transparent;
    background:
        linear-gradient(
            135deg,
            var(--gl-teal-dark),
            var(--gl-blue)
        );
    color: var(--gl-white);
}


/* =========================================================
   BOTTOM PANELS
   ========================================================= */

.gl-bottom-panel
{
    border-top: 1px solid var(--gl-border);
    background: var(--gl-white);
}

.gl-bottom-panel[hidden]
{
    display: none !important;
}

.gl-bottom-panel-header
{
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.15rem 1.25rem;
    border-bottom: 1px solid var(--gl-border);
    background: var(--gl-lighter);
}

.gl-bottom-panel-header h3
{
    margin: 0;
    color: var(--gl-navy);
    font-size: 1.05rem;
    font-weight: 800;
}

.gl-analysis-content,
.gl-table-content,
.gl-understand-content
{
    padding: 1.25rem;
}

.gl-panel-empty-state
{
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.65rem;
    min-height: 90px;
    padding: 1rem;
    border: 1px dashed var(--gl-border-dark);
    border-radius: 0.8rem;
    background: var(--gl-lighter);
    color: var(--gl-muted);
    text-align: center;
}

.gl-panel-empty-state svg
{
    width: 20px;
    height: 20px;
    flex: 0 0 auto;
    color: var(--gl-teal-dark);
}

.gl-panel-empty-state p
{
    margin: 0;
    max-width: 600px;
    font-size: 0.82rem;
    line-height: 1.55;
}


/* =========================================================
   ANALYSIS COMPONENTS
   ========================================================= */

.gl-analysis-grid
{
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.8rem;
}

.gl-analysis-item
{
    padding: 1rem;
    border: 1px solid var(--gl-border);
    border-radius: 0.8rem;
    background: var(--gl-lighter);
}

.gl-analysis-item span
{
    display: block;
    margin-bottom: 0.35rem;
    color: var(--gl-muted);
    font-size: 0.7rem;
    font-weight: 750;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.gl-analysis-item strong
{
    display: block;
    color: var(--gl-navy);
    font-size: 1rem;
    font-weight: 800;
    overflow-wrap: anywhere;
}


/* =========================================================
   TABLE COMPONENTS
   ========================================================= */

.gl-value-table-wrap
{
    width: 100%;
    overflow-x: auto;
}

.gl-value-table
{
    width: 100%;
    border-collapse: collapse;
}

.gl-value-table th,
.gl-value-table td
{
    padding: 0.7rem 0.85rem;
    border-bottom: 1px solid var(--gl-border);
    color: var(--gl-text);
    font-size: 0.8rem;
    text-align: center;
}

.gl-value-table th
{
    background: var(--gl-lighter);
    color: var(--gl-navy);
    font-weight: 800;
}

.gl-value-table tbody tr
{
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.gl-value-table tbody tr:hover
{
    background: rgba(21, 154, 156, 0.055);
}


/* =========================================================
   UNDERSTAND THIS GRAPH
   ========================================================= */

.gl-understand-panel
{
    background:
        linear-gradient(
            180deg,
            #ffffff,
            rgba(21, 154, 156, 0.025)
        );
}

.gl-understand-step-list
{
    display: grid;
    gap: 0.75rem;
}

.gl-understand-step
{
    display: grid;
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 0.85rem;
    align-items: flex-start;
    padding: 0.9rem;
    border: 1px solid var(--gl-border);
    border-radius: 0.8rem;
    background: var(--gl-white);
}

.gl-understand-step-number
{
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: rgba(21, 154, 156, 0.1);
    color: var(--gl-teal-dark);
    font-size: 0.78rem;
    font-weight: 800;
}

.gl-understand-step h4
{
    margin: 0 0 0.25rem;
    color: var(--gl-navy);
    font-size: 0.88rem;
    font-weight: 800;
}

.gl-understand-step p
{
    margin: 0;
    color: var(--gl-muted);
    font-size: 0.8rem;
    line-height: 1.6;
}


/* =========================================================
   INFO SECTION
   ========================================================= */

.gl-info-section
{
    padding: 4.5rem 0;
    background: var(--gl-white);
}

.gl-info-grid
{
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.4rem;
}

.gl-info-card
{
    padding: 1.6rem;
    border: 1px solid var(--gl-border);
    border-radius: 1rem;
    background: var(--gl-white);
    box-shadow: var(--gl-shadow-small);
    transition:
        transform 0.2s ease,
        box-shadow 0.2s ease,
        border-color 0.2s ease;
}

.gl-info-card:hover
{
    transform: translateY(-4px);
    border-color: rgba(21, 154, 156, 0.35);
    box-shadow: var(--gl-shadow);
}

.gl-info-icon
{
    display: flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    margin-bottom: 1rem;
    border-radius: 0.8rem;
    background: rgba(21, 154, 156, 0.1);
    color: var(--gl-teal-dark);
}

.gl-info-icon svg
{
    width: 21px;
    height: 21px;
}

.gl-info-card h2
{
    margin: 0 0 0.7rem;
    color: var(--gl-navy);
    font-size: 1.08rem;
    font-weight: 800;
}

.gl-info-card p
{
    margin: 0;
    color: var(--gl-muted);
    font-size: 0.9rem;
    line-height: 1.7;
}


/* =========================================================
   SEO SECTION
   ========================================================= */

.gl-seo-section
{
    padding: 5rem 0;
    background:
        linear-gradient(
            180deg,
            var(--gl-lighter),
            var(--gl-white)
        );
}

.gl-seo-content
{
    width: min(100%, 880px);
    margin: 0 auto;
}

.gl-seo-content h2
{
    margin: 0 0 1rem;
    color: var(--gl-navy);
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    line-height: 1.2;
}

.gl-seo-content h3
{
    margin: 2.2rem 0 0.75rem;
    color: var(--gl-navy);
    font-size: 1.25rem;
    font-weight: 800;
}

.gl-seo-content p
{
    margin: 0 0 1rem;
    color: var(--gl-muted);
    font-size: 0.96rem;
    line-height: 1.8;
}

.gl-seo-actions
{
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.2rem;
    margin-top: 2rem;
}

.gl-resource-link
{
    color: var(--gl-teal-dark);
    font-size: 0.9rem;
    font-weight: 700;
    text-decoration: none;
}

.gl-resource-link:hover
{
    color: var(--gl-navy);
    text-decoration: underline;
}


/* =========================================================
   COLLAPSED DESKTOP EXPRESSION PANEL
   ========================================================= */

.gl-app.is-expression-panel-collapsed .gl-workspace
{
    grid-template-columns: 58px minmax(0, 1fr);
}

.gl-app.is-expression-panel-collapsed .gl-expression-panel-header > div,
.gl-app.is-expression-panel-collapsed .gl-expression-list,
.gl-app.is-expression-panel-collapsed .gl-expression-add-area,
.gl-app.is-expression-panel-collapsed .gl-expression-utilities
{
    display: none;
}

.gl-app.is-expression-panel-collapsed .gl-expression-panel-header
{
    justify-content: center;
    padding: 0.85rem 0.5rem;
}

.gl-app.is-expression-panel-collapsed
.gl-desktop-panel-toggle
{
    transform: rotate(180deg);
}


/* =========================================================
   OPTIONAL ACTIVE / ERROR STATES
   ========================================================= */

.gl-expression-row.has-error
{
    background: rgba(192, 57, 43, 0.025);
}

.gl-expression-row.has-error::before
{
    background: var(--gl-red);
}

.gl-expression-row.is-hidden
{
    opacity: 0.55;
}

.gl-expression-row.is-hidden .gl-expression-input
{
    text-decoration: line-through;
    text-decoration-thickness: 1px;
}


/* =========================================================
   GENERIC HIDDEN
   ========================================================= */

.gl-app [hidden]
{
    display: none !important;
}


/* =========================================================
   LARGE DESKTOP
   ========================================================= */

@media (min-width: 1500px)
{
    .gl-workspace
    {
        grid-template-columns: 410px minmax(0, 1fr);
    }

    .gl-graph-viewport
    {
        height: 680px;
    }
}


/* =========================================================
   LAPTOP
   ========================================================= */

@media (max-width: 1200px)
{
    .gl-workspace
    {
        grid-template-columns: 340px minmax(0, 1fr);
    }

    .gl-graph-viewport
    {
        height: 590px;
    }

    .gl-learning-bar
    {
        align-items: flex-start;
        flex-direction: column;
    }

    .gl-learning-actions
    {
        width: 100%;
        justify-content: flex-start;
    }

    .gl-analysis-grid
    {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}


/* =========================================================
   TABLET
   ========================================================= */

@media (max-width: 900px)
{
    .gl-hero
    {
        padding: 2.75rem 0;
    }

    .gl-hero-content
    {
        align-items: flex-start;
        flex-direction: column;
        gap: 1.5rem;
    }

    .gl-app-header
    {
        align-items: flex-start;
        flex-direction: column;
        gap: 0.9rem;
    }

    .gl-mode-switcher
    {
        width: 100%;
    }

    .gl-mode-button
    {
        flex: 1 1 0;
    }

    .gl-workspace
    {
        display: block;
        min-height: 0;
    }

    .gl-expression-panel
    {
        position: absolute;
        top: 0;
        left: 0;
        z-index: 40;
        width: min(390px, 88%);
        height: 100%;
        border-right: 1px solid var(--gl-border);
        box-shadow: 15px 0 40px rgba(16, 42, 67, 0.16);
        transform: translateX(-105%);
        transition: transform 0.25s ease;
    }

    .gl-app.is-mobile-expression-panel-open
    .gl-expression-panel
    {
        transform: translateX(0);
    }

    .gl-app.is-mobile-expression-panel-open::after
    {
        content: "";
        position: absolute;
        inset: 0;
        z-index: 35;
        background: rgba(8, 28, 47, 0.24);
        pointer-events: none;
    }

    .gl-app
    {
        position: relative;
    }

    .gl-mobile-expression-toggle
    {
        display: inline-flex;
    }

    .gl-desktop-panel-toggle
    {
        display: none;
    }

    .gl-graph-viewport
    {
        height: 590px;
    }

    .gl-info-grid
    {
        grid-template-columns: 1fr;
    }
}


/* =========================================================
   MOBILE
   ========================================================= */

@media (max-width: 600px)
{
    .gl-page-container
    {
        padding-left: 0.85rem;
        padding-right: 0.85rem;
    }

    .gl-hero
    {
        padding: 2.35rem 0;
    }

    .gl-hero h1
    {
        font-size: 2.35rem;
    }

    .gl-hero-description
    {
        font-size: 0.96rem;
        line-height: 1.65;
    }

    .gl-section
    {
        padding: 1.8rem 0 3rem;
    }

    .gl-app
    {
        border-radius: 1rem;
    }

    .gl-app-header
    {
        min-height: auto;
        padding: 1rem;
    }

    .gl-app-heading h2
    {
        font-size: 1.2rem;
    }

    .gl-coming-soon
    {
        display: none;
    }

    .gl-graph-toolbar
    {
        padding: 0.5rem;
    }

    .gl-toolbar-button
    {
        min-width: 38px;
        padding: 0.5rem;
    }

    .gl-toolbar-text
    {
        display: none;
    }

    .gl-graph-viewport
    {
        height: 500px;
    }

    .gl-coordinate-readout
    {
        top: 0.6rem;
        left: 0.6rem;
    }

    .gl-zoom-controls
    {
        right: 0.65rem;
        bottom: 0.65rem;
    }

    .gl-graph-control-button
    {
        width: 40px;
        height: 40px;
    }

    .gl-test-point-floating-button
    {
        left: 0.65rem;
        bottom: 0.65rem;
        min-height: 40px;
        padding: 0.55rem 0.65rem;
        font-size: 0.68rem;
    }

    .gl-learning-bar
    {
        padding: 0.95rem;
    }

    .gl-learning-bar-copy
    {
        align-items: flex-start;
    }

    .gl-learning-actions
    {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        width: 100%;
    }

    .gl-learning-button
    {
        width: 100%;
    }

    .gl-learning-button-primary
    {
        grid-column: 1 / -1;
    }

    .gl-bottom-panel-header
    {
        padding: 1rem;
    }

    .gl-analysis-content,
    .gl-table-content,
    .gl-understand-content
    {
        padding: 1rem;
    }

    .gl-analysis-grid
    {
        grid-template-columns: 1fr;
    }

    .gl-info-section
    {
        padding: 3.5rem 0;
    }

    .gl-info-card
    {
        padding: 1.35rem;
    }

    .gl-seo-section
    {
        padding: 4rem 0;
    }
}


/* =========================================================
   SMALL MOBILE
   ========================================================= */

@media (max-width: 420px)
{
    .gl-expression-panel
    {
        width: 92%;
    }

    .gl-expression-row-main
    {
        grid-template-columns: auto minmax(0, 1fr);
    }

    .gl-expression-actions
    {
        grid-column: 2;
        justify-content: flex-end;
    }

    .gl-graph-viewport
    {
        height: 460px;
    }

    .gl-learning-actions
    {
        grid-template-columns: 1fr;
    }

    .gl-learning-button-primary
    {
        grid-column: auto;
    }

    .gl-test-point-floating-button span
    {
        display: none;
    }
}


/* =========================================================
   REDUCED MOTION
   ========================================================= */

@media (prefers-reduced-motion: reduce)
{
    .graphing-lab-page *,
    .graphing-lab-page *::before,
    .graphing-lab-page *::after
    {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}

/* =========================================================
   TEST A POINT RESULT
   ========================================================= */

.gl-test-point-result
{
    position: absolute;
    left: 0.9rem;
    bottom: 4.3rem;
    z-index: 15;
    width: min(360px, calc(100% - 1.8rem));
    overflow: hidden;
    border: 1px solid var(--gl-border);
    border-radius: 0.9rem;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--gl-shadow);
    backdrop-filter: blur(10px);
}

.gl-test-point-result[hidden]
{
    display: none !important;
}

.gl-test-point-result.is-correct
{
    border-color: rgba(25, 135, 84, 0.32);
}

.gl-test-point-result.is-incorrect
{
    border-color: rgba(192, 57, 43, 0.30);
}

.gl-test-point-result-header
{
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.85rem 0.9rem;
    border-bottom: 1px solid var(--gl-border);
    background: var(--gl-lighter);
}

.gl-test-point-result-eyebrow
{
    display: block;
    margin-bottom: 0.15rem;
    color: var(--gl-teal-dark);
    font-size: 0.64rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.gl-test-point-result-header strong
{
    display: block;
    color: var(--gl-navy);
    font-size: 0.85rem;
    font-weight: 800;
}

.gl-test-point-result-body
{
    padding: 0.9rem;
}

.gl-test-point-expression
{
    display: flex;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-bottom: 0.8rem;
    color: var(--gl-muted);
    font-size: 0.75rem;
}

.gl-test-point-expression strong
{
    color: var(--gl-navy);
    font-size: 0.82rem;
}

.gl-test-point-substitution
{
    padding: 0.75rem;
    border: 1px solid var(--gl-border);
    border-radius: 0.7rem;
    background: var(--gl-light);
}

.gl-test-point-substitution-label
{
    display: block;
    margin-bottom: 0.55rem;
    color: var(--gl-muted);
    font-size: 0.7rem;
    line-height: 1.45;
}

.gl-test-point-comparison
{
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    color: var(--gl-navy);
    font-size: 1.15rem;
}

.gl-test-point-comparison strong
{
    font-size: 1.2rem;
    font-weight: 800;
}

.gl-test-point-verdict
{
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    margin-top: 0.75rem;
    padding: 0.7rem 0.75rem;
    border-radius: 0.7rem;
}

.gl-test-point-verdict strong
{
    font-size: 0.78rem;
    font-weight: 800;
}

.gl-test-point-verdict span
{
    font-size: 0.7rem;
    line-height: 1.45;
}

.gl-test-point-verdict.is-correct
{
    background: rgba(25, 135, 84, 0.08);
    color: #12633e;
}

.gl-test-point-verdict.is-incorrect
{
    background: rgba(192, 57, 43, 0.07);
    color: #922b21;
}

.gl-test-point-instruction
{
    margin: 0;
    color: var(--gl-muted);
    font-size: 0.75rem;
    line-height: 1.6;
}

.gl-test-point-instruction strong
{
    color: var(--gl-navy);
}


@media (max-width: 600px)
{
    .gl-test-point-result
    {
        left: 0.65rem;
        bottom: 4rem;
        width: calc(100% - 1.3rem);
    }
}

/* =========================================================
   GRAPHING LAB VALUE TABLE
   ========================================================= */

.gl-table-toolbar
{
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.gl-table-expression-info
{
    display: flex;
    align-items: center;
    gap: 0.65rem;
}

.gl-table-color-dot
{
    flex: 0 0 auto;
    width: 14px;
    height: 14px;
    border: 2px solid #ffffff;
    border-radius: 50%;
    box-shadow:
        0 0 0 1px rgba(16, 42, 67, 0.15),
        0 2px 5px rgba(16, 42, 67, 0.10);
}

.gl-table-expression-info span:not(.gl-table-color-dot)
{
    display: block;
    margin-bottom: 0.15rem;
    color: var(--gl-muted);
    font-size: 0.68rem;
    font-weight: 700;
}

.gl-table-expression-info strong
{
    display: block;
    color: var(--gl-navy);
    font-size: 0.86rem;
    font-weight: 800;
}

.gl-table-range-controls
{
    display: flex;
    align-items: flex-end;
    flex-wrap: wrap;
    gap: 0.55rem;
}

.gl-table-range-controls label
{
    display: block;
}

.gl-table-range-controls label > span
{
    display: block;
    margin-bottom: 0.25rem;
    color: var(--gl-muted);
    font-size: 0.65rem;
    font-weight: 750;
}

.gl-table-range-input
{
    width: 76px;
    min-height: 36px;
    padding: 0.4rem 0.5rem;
    border: 1px solid var(--gl-border);
    border-radius: 0.55rem;
    background: var(--gl-white);
    color: var(--gl-navy);
    font-size: 0.75rem;
    font-weight: 700;
    outline: none;
}

.gl-table-range-input:focus
{
    border-color: var(--gl-teal);
    box-shadow:
        0 0 0 3px rgba(21, 154, 156, 0.12);
}

.gl-value-table-action-heading
{
    width: 70px;
}

.gl-value-row.is-selected
{
    background: rgba(21, 154, 156, 0.09);
}

.gl-value-row.is-selected td
{
    color: var(--gl-navy);
    font-weight: 700;
}

.gl-value-row.is-undefined
{
    cursor: default;
    opacity: 0.64;
}

.gl-table-undefined
{
    color: var(--gl-muted-light);
    font-style: italic;
}

.gl-table-plot-button
{
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    border: 1px solid var(--gl-border);
    border-radius: 0.55rem;
    background: var(--gl-white);
    color: var(--gl-teal-dark);
    transition:
        border-color 0.2s ease,
        background-color 0.2s ease,
        color 0.2s ease;
}

.gl-table-plot-button svg
{
    width: 15px;
    height: 15px;
}

.gl-table-plot-button:hover:not(:disabled)
{
    border-color: rgba(21, 154, 156, 0.5);
    background: rgba(21, 154, 156, 0.06);
}

.gl-table-plot-button:disabled
{
    opacity: 0.4;
    cursor: not-allowed;
}

.gl-table-help
{
    margin: 0.85rem 0 0;
    color: var(--gl-muted);
    font-size: 0.72rem;
    line-height: 1.5;
}


@media (max-width: 700px)
{
    .gl-table-toolbar
    {
        align-items: stretch;
        flex-direction: column;
    }

    .gl-table-range-controls
    {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        width: 100%;
    }

    .gl-table-range-input
    {
        width: 100%;
    }
}


@media (max-width: 430px)
{
    .gl-table-range-controls
    {
        grid-template-columns: 1fr;
    }
}

/* =========================================================
   GRAPHING LAB
   TABLE DRAWER UX OVERRIDES
   ========================================================= */


/* =========================================================
   APP POSITIONING
   Allows the table to float over the graph instead of
   expanding the entire page vertically.
   ========================================================= */

.gl-app
{
    position: relative;
}


/* =========================================================
   TABLE PANEL — DESKTOP SIDE DRAWER
   ========================================================= */

#tablePanel.gl-bottom-panel
{
    position: absolute;
    top: 142px;
    right: 0;
    bottom: 72px;
    z-index: 30;

    display: flex;
    flex-direction: column;

    width: 380px;
    max-width: calc(100% - 80px);

    overflow: hidden;

    border-top: 0;
    border-left: 1px solid var(--gl-border);
    border-radius: 0;

    background: rgba(255, 255, 255, 0.985);

    box-shadow:
        -12px 0 35px rgba(16, 42, 67, 0.12);

    backdrop-filter: blur(10px);
}


/*
 * Preserve normal hidden behavior.
 */

#tablePanel.gl-bottom-panel[hidden]
{
    display: none !important;
}


/* =========================================================
   TABLE DRAWER HEADER
   ========================================================= */

#tablePanel .gl-bottom-panel-header
{
    flex: 0 0 auto;

    align-items: center;

    padding: 0.9rem 1rem;

    border-bottom: 1px solid var(--gl-border);

    background:
        linear-gradient(
            180deg,
            #ffffff,
            #fbfcfe
        );
}


#tablePanel .gl-bottom-panel-header .gl-panel-label
{
    margin-bottom: 0.18rem;

    font-size: 0.63rem;
}


#tablePanel .gl-bottom-panel-header h3
{
    font-size: 0.95rem;
    line-height: 1.25;
}


/* =========================================================
   TABLE DRAWER CONTENT
   ========================================================= */

#tablePanel .gl-table-content
{
    display: flex;
    flex: 1 1 auto;
    flex-direction: column;

    min-height: 0;

    padding: 0;
}


/* =========================================================
   TABLE TOOLBAR
   ========================================================= */

#tablePanel .gl-table-toolbar
{
    display: block;

    flex: 0 0 auto;

    margin: 0;
    padding: 0.9rem 1rem;

    border-bottom: 1px solid var(--gl-border);

    background: var(--gl-white);
}


/* =========================================================
   EXPRESSION IDENTIFIER
   ========================================================= */

#tablePanel .gl-table-expression-info
{
    margin-bottom: 0.8rem;
}


#tablePanel .gl-table-expression-info strong
{
    font-size: 0.86rem;
}


#tablePanel .gl-table-expression-info span:not(.gl-table-color-dot)
{
    font-size: 0.62rem;
}


/* =========================================================
   RANGE CONTROLS
   Compact single-row controls inside drawer.
   ========================================================= */

#tablePanel .gl-table-range-controls
{
    display: grid;

    grid-template-columns:
        repeat(
            3,
            minmax(0, 1fr)
        );

    gap: 0.45rem;

    width: 100%;
}


#tablePanel .gl-table-range-controls label
{
    min-width: 0;
}


#tablePanel .gl-table-range-controls label > span
{
    margin-bottom: 0.2rem;

    font-size: 0.58rem;

    white-space: nowrap;
}


#tablePanel .gl-table-range-input
{
    width: 100%;
    min-width: 0;
    min-height: 34px;

    padding: 0.35rem 0.45rem;

    font-size: 0.7rem;
}


/* =========================================================
   SCROLLABLE TABLE AREA
   Only the values scroll — not the page.
   ========================================================= */

#tablePanel .gl-value-table-wrap
{
    flex: 1 1 auto;

    min-height: 0;

    overflow-x: hidden;
    overflow-y: auto;

    overscroll-behavior: contain;

    scrollbar-width: thin;
    scrollbar-color:
        #c6d5e1
        transparent;
}


#tablePanel .gl-value-table-wrap::-webkit-scrollbar
{
    width: 7px;
}


#tablePanel .gl-value-table-wrap::-webkit-scrollbar-track
{
    background: transparent;
}


#tablePanel .gl-value-table-wrap::-webkit-scrollbar-thumb
{
    border-radius: 999px;

    background: #c6d5e1;
}


/* =========================================================
   COMPACT TABLE
   ========================================================= */

#tablePanel .gl-value-table
{
    width: 100%;

    table-layout: fixed;

    border-collapse: collapse;
}


/*
 * Keep x/y labels visible while scrolling.
 */

#tablePanel .gl-value-table thead
{
    position: sticky;
    top: 0;
    z-index: 3;
}


#tablePanel .gl-value-table th
{
    padding: 0.55rem 0.75rem;

    border-bottom: 1px solid var(--gl-border);

    background: #f7fafc;

    color: var(--gl-navy);

    font-size: 0.68rem;
    font-weight: 800;
}


#tablePanel .gl-value-table td
{
    height: 45px;

    padding: 0.55rem 0.75rem;

    border-bottom: 1px solid #e8eef4;

    color: var(--gl-text);

    font-size: 0.78rem;
    font-weight: 600;

    text-align: center;
}


/* =========================================================
   CLICKABLE ROWS
   ========================================================= */

#tablePanel .gl-value-row
{
    position: relative;

    cursor: pointer;

    outline: none;

    transition:
        background-color 0.16s ease,
        box-shadow 0.16s ease;
}


#tablePanel .gl-value-row:hover
{
    background: rgba(21, 154, 156, 0.055);
}


#tablePanel .gl-value-row:focus-visible
{
    z-index: 1;

    background: rgba(21, 154, 156, 0.075);

    box-shadow:
        inset 0 0 0 2px rgba(21, 154, 156, 0.42);
}


#tablePanel .gl-value-row.is-selected
{
    background: rgba(21, 154, 156, 0.11);

    box-shadow:
        inset 4px 0 0 var(--gl-teal);
}


#tablePanel .gl-value-row.is-selected td
{
    color: var(--gl-navy);
    font-weight: 800;
}


/* =========================================================
   UNDEFINED ROW
   ========================================================= */

#tablePanel .gl-value-row.is-undefined
{
    cursor: default;

    opacity: 0.55;
}


#tablePanel .gl-value-row.is-undefined:hover
{
    background: transparent;
}


#tablePanel .gl-table-undefined
{
    color: var(--gl-muted-light);

    font-size: 0.7rem;
    font-style: italic;
    font-weight: 500;
}


/* =========================================================
   TABLE HELP
   ========================================================= */

#tablePanel .gl-table-help
{
    flex: 0 0 auto;

    margin: 0;
    padding: 0.7rem 1rem;

    border-top: 1px solid var(--gl-border);

    background: var(--gl-lighter);

    color: var(--gl-muted);

    font-size: 0.65rem;
    line-height: 1.45;

    text-align: center;
}


/* =========================================================
   DESKTOP DRAWER OPEN EFFECT
   Slight visual division from the graph.
   ========================================================= */

#tablePanel::before
{
    content: "";

    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;

    width: 3px;

    background:
        linear-gradient(
            180deg,
            var(--gl-teal),
            var(--gl-blue)
        );

    pointer-events: none;
}


/* =========================================================
   MEDIUM SCREENS
   Slightly narrower drawer.
   ========================================================= */

@media (max-width: 1200px)
{
    #tablePanel.gl-bottom-panel
    {
        width: 350px;
    }
}


/* =========================================================
   MOBILE / TABLET
   Bottom sheet instead of side drawer.
   ========================================================= */

@media (max-width: 900px)
{
    #tablePanel.gl-bottom-panel
    {
        top: auto;
        right: 0;
        bottom: 0;
        left: 0;

        width: 100%;
        max-width: none;

        height: min(
            52vh,
            470px
        );

        border-top: 1px solid var(--gl-border);
        border-left: 0;

        border-radius:
            1rem
            1rem
            0
            0;

        box-shadow:
            0 -15px 38px rgba(16, 42, 67, 0.16);
    }


    /*
     * On mobile the accent becomes horizontal.
     */

    #tablePanel::before
    {
        top: 0;
        right: 0;
        bottom: auto;
        left: 0;

        width: auto;
        height: 3px;
    }


    #tablePanel .gl-bottom-panel-header
    {
        padding:
            0.8rem
            0.9rem;
    }


    #tablePanel .gl-table-toolbar
    {
        padding:
            0.7rem
            0.9rem;
    }


    #tablePanel .gl-table-expression-info
    {
        margin-bottom: 0.6rem;
    }


    #tablePanel .gl-value-table th
    {
        padding:
            0.45rem
            0.6rem;
    }


    #tablePanel .gl-value-table td
    {
        height: 42px;

        padding:
            0.45rem
            0.6rem;
    }
}


/* =========================================================
   SMALL MOBILE
   ========================================================= */

@media (max-width: 500px)
{
    #tablePanel.gl-bottom-panel
    {
        height: min(
            55vh,
            440px
        );
    }


    #tablePanel .gl-bottom-panel-header h3
    {
        font-size: 0.88rem;
    }


    #tablePanel .gl-table-range-controls
    {
        gap: 0.35rem;
    }


    #tablePanel .gl-table-range-controls label > span
    {
        font-size: 0.54rem;
    }


    #tablePanel .gl-table-range-input
    {
        min-height: 32px;

        padding:
            0.3rem
            0.35rem;

        font-size: 0.67rem;
    }


    #tablePanel .gl-value-table td
    {
        height: 40px;

        font-size: 0.74rem;
    }


    #tablePanel .gl-table-help
    {
        padding:
            0.55rem
            0.75rem;

        font-size: 0.6rem;
    }
}

/* =========================================================
   TABLE HEADER CONTAINMENT FIX
   ========================================================= */

#tablePanel .gl-value-table-wrap
{
    position: relative;

    width: 100%;

    overflow-x: hidden;
    overflow-y: auto;
}


#tablePanel .gl-value-table
{
    width: 100%;
    max-width: 100%;

    table-layout: fixed;

    border-collapse: collapse;
}


#tablePanel .gl-value-table thead
{
    position: sticky;

    top: 0;

    z-index: 3;

    width: 100%;
}


#tablePanel .gl-value-table thead tr
{
    width: 100%;
}


#tablePanel .gl-value-table th
{
    width: 50%;

    box-sizing: border-box;
}


/*
 * Prevent the sticky header background from visually
 * bleeding outside the scrollable table area.
 */

#tablePanel .gl-value-table-wrap
{
    border-top: 1px solid var(--gl-border);
}


#tablePanel .gl-value-table thead::after
{
    content: "";

    position: absolute;

    right: 0;
    bottom: 0;
    left: 0;

    height: 1px;

    background: var(--gl-border);

    pointer-events: none;
}

/* =========================================================
   TABLE DRAWER LEFT EDGE FIX
   ========================================================= */

#tablePanel .gl-value-table-wrap
{
    margin-left: 3px;

    width: calc(100% - 3px);
}


#tablePanel .gl-table-toolbar
{
    margin-left: 3px;
}


#tablePanel .gl-table-help
{
    margin-left: 3px;
}

/* =========================================================
   GRAPHING LAB
   ANALYZE DRAWER
   ========================================================= */

#analysisPanel.gl-bottom-panel
{
    position: absolute;
    top: 142px;
    right: 0;
    bottom: 72px;
    z-index: 31;

    display: flex;
    flex-direction: column;

    width: 390px;
    max-width: calc(100% - 80px);

    overflow: hidden;

    border-top: 0;
    border-left: 1px solid var(--gl-border);

    background: rgba(255, 255, 255, 0.985);

    box-shadow:
        -12px 0 35px rgba(16, 42, 67, 0.12);

    backdrop-filter: blur(10px);
}


#analysisPanel.gl-bottom-panel[hidden]
{
    display: none !important;
}


#analysisPanel::before
{
    content: "";

    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;

    width: 3px;

    background:
        linear-gradient(
            180deg,
            var(--gl-teal),
            var(--gl-blue)
        );

    pointer-events: none;
}


/* =========================================================
   ANALYSIS HEADER
   ========================================================= */

#analysisPanel .gl-bottom-panel-header
{
    flex: 0 0 auto;

    align-items: center;

    padding: 0.9rem 1rem;

    background:
        linear-gradient(
            180deg,
            #ffffff,
            #fbfcfe
        );
}


#analysisPanel .gl-bottom-panel-header .gl-panel-label
{
    margin-bottom: 0.18rem;

    font-size: 0.63rem;
}


#analysisPanel .gl-bottom-panel-header h3
{
    font-size: 0.95rem;
}


/* =========================================================
   ANALYSIS CONTENT
   ========================================================= */

#analysisPanel .gl-analysis-content
{
    flex: 1 1 auto;

    min-height: 0;

    overflow-y: auto;

    padding: 1rem;

    overscroll-behavior: contain;
}


/* =========================================================
   ANALYSIS SUMMARY
   ========================================================= */

.gl-analysis-summary
{
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.8rem;

    margin-bottom: 1rem;
}


.gl-analysis-expression
{
    display: flex;
    align-items: center;
    gap: 0.6rem;

    min-width: 0;
}


.gl-analysis-color-dot
{
    flex: 0 0 auto;

    width: 14px;
    height: 14px;

    border: 2px solid #ffffff;
    border-radius: 50%;

    box-shadow:
        0 0 0 1px rgba(16, 42, 67, 0.14);
}


.gl-analysis-expression span
{
    display: block;

    margin-bottom: 0.12rem;

    color: var(--gl-muted);

    font-size: 0.62rem;
    font-weight: 700;
}


.gl-analysis-expression strong
{
    display: block;

    overflow: hidden;

    color: var(--gl-navy);

    font-size: 0.85rem;
    font-weight: 800;

    text-overflow: ellipsis;
    white-space: nowrap;
}


.gl-analysis-family-badge
{
    flex: 0 0 auto;

    padding: 0.28rem 0.5rem;

    border-radius: 999px;

    background: rgba(21, 154, 156, 0.09);

    color: var(--gl-teal-dark);

    font-size: 0.6rem;
    font-weight: 800;
}


/* =========================================================
   ANALYSIS GRID
   ========================================================= */

#analysisPanel .gl-analysis-grid
{
    grid-template-columns:
        repeat(
            2,
            minmax(0, 1fr)
        );

    gap: 0.55rem;
}


#analysisPanel .gl-analysis-item
{
    min-width: 0;

    padding: 0.8rem;

    border-radius: 0.7rem;
}


#analysisPanel .gl-analysis-item span
{
    margin-bottom: 0.3rem;

    font-size: 0.58rem;
}


#analysisPanel .gl-analysis-item strong
{
    font-size: 0.88rem;
}


/* =========================================================
   EXPLANATION
   ========================================================= */

.gl-analysis-explanation
{
    margin-top: 1rem;
    padding: 0.9rem;

    border: 1px solid var(--gl-border);
    border-radius: 0.75rem;

    background: var(--gl-lighter);
}


.gl-analysis-explanation h4
{
    margin:
        0
        0
        0.55rem;

    color: var(--gl-navy);

    font-size: 0.78rem;
    font-weight: 800;
}


.gl-analysis-explanation p
{
    margin:
        0
        0
        0.45rem;

    color: var(--gl-muted);

    font-size: 0.72rem;
    line-height: 1.55;
}


.gl-analysis-explanation p:last-child
{
    margin-bottom: 0;
}


/* =========================================================
   OVERLAY CONTROLS
   ========================================================= */

.gl-analysis-controls
{
    display: grid;

    grid-template-columns:
        repeat(
            2,
            minmax(0, 1fr)
        );

    gap: 0.5rem;

    margin-top: 1rem;
}


.gl-analysis-toggle-button
{
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;

    min-height: 40px;

    padding:
        0.5rem
        0.6rem;

    border: 1px solid var(--gl-border);
    border-radius: 0.65rem;

    background: var(--gl-white);

    color: var(--gl-navy);

    font-size: 0.66rem;
    font-weight: 800;

    transition:
        border-color 0.2s ease,
        background-color 0.2s ease,
        color 0.2s ease;
}


.gl-analysis-toggle-button svg
{
    width: 15px;
    height: 15px;
}


.gl-analysis-toggle-button:hover:not(:disabled)
{
    border-color: rgba(21, 154, 156, 0.5);

    background: rgba(21, 154, 156, 0.05);

    color: var(--gl-teal-dark);
}


.gl-analysis-toggle-button.is-active
{
    border-color: var(--gl-teal);

    background: rgba(21, 154, 156, 0.1);

    color: var(--gl-teal-dark);
}


.gl-analysis-toggle-button:disabled
{
    opacity: 0.45;

    cursor: not-allowed;
}


/* =========================================================
   EQUATION TYPE DETAIL
   ========================================================= */

.gl-analysis-detail
{
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;

    margin-top: 1rem;

    padding:
        0.7rem
        0;

    border-top: 1px solid var(--gl-border);
}


.gl-analysis-detail span
{
    color: var(--gl-muted);

    font-size: 0.66rem;
    font-weight: 700;
}


.gl-analysis-detail strong
{
    color: var(--gl-navy);

    font-size: 0.7rem;
    font-weight: 800;

    text-align: right;
}


/* =========================================================
   TABLET / MOBILE
   ========================================================= */

@media (max-width: 900px)
{
    #analysisPanel.gl-bottom-panel
    {
        top: auto;
        right: 0;
        bottom: 0;
        left: 0;

        width: 100%;
        max-width: none;

        height: min(
            56vh,
            510px
        );

        border-top: 1px solid var(--gl-border);
        border-left: 0;

        border-radius:
            1rem
            1rem
            0
            0;

        box-shadow:
            0 -15px 38px rgba(16, 42, 67, 0.16);
    }


    #analysisPanel::before
    {
        top: 0;
        right: 0;
        bottom: auto;
        left: 0;

        width: auto;
        height: 3px;
    }
}


@media (max-width: 500px)
{
    #analysisPanel .gl-analysis-content
    {
        padding: 0.85rem;
    }


    .gl-analysis-summary
    {
        align-items: flex-start;
    }


    #analysisPanel .gl-analysis-grid
    {
        grid-template-columns:
            repeat(
                2,
                minmax(0, 1fr)
            );
    }


    .gl-analysis-controls
    {
        grid-template-columns: 1fr;
    }
}

/* =========================================================
   GRAPHING LAB
   UNDERSTAND THIS GRAPH DRAWER
   ========================================================= */

#understandPanel
{
    position: absolute;
    top: 142px;
    right: 0;
    bottom: 72px;
    z-index: 32;

    display: flex;
    flex-direction: column;

    width: 410px;
    max-width: calc(100% - 80px);

    overflow: hidden;

    border-left: 1px solid var(--gl-border);

    background: rgba(255, 255, 255, 0.985);

    box-shadow:
        -12px 0 35px rgba(16, 42, 67, 0.12);

    backdrop-filter: blur(10px);
}


#understandPanel[hidden]
{
    display: none !important;
}


#understandPanel::before
{
    content: "";

    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;

    width: 3px;

    background:
        linear-gradient(
            180deg,
            var(--gl-teal),
            var(--gl-blue)
        );

    pointer-events: none;
}


/* =========================================================
   UNDERSTAND HEADER
   ========================================================= */

.gl-understand-header
{
    display: flex;
    flex: 0 0 auto;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;

    padding: 0.9rem 1rem;

    border-bottom: 1px solid var(--gl-border);

    background:
        linear-gradient(
            180deg,
            #ffffff,
            #fbfcfe
        );
}


.gl-panel-eyebrow
{
    display: block;

    margin-bottom: 0.2rem;

    color: var(--gl-teal-dark);

    font-size: 0.62rem;
    font-weight: 800;

    letter-spacing: 0.08em;

    text-transform: uppercase;
}


.gl-understand-header h3
{
    margin: 0;

    color: var(--gl-navy);

    font-size: 0.95rem;
    font-weight: 800;

    line-height: 1.3;
}


.gl-panel-close
{
    display: inline-flex;
    align-items: center;
    justify-content: center;

    flex: 0 0 auto;

    width: 34px;
    height: 34px;

    padding: 0;

    border: 0;
    border-radius: 0.55rem;

    background: transparent;

    color: var(--gl-muted);
}


.gl-panel-close:hover
{
    background: rgba(16, 42, 67, 0.06);

    color: var(--gl-navy);
}


.gl-panel-close svg
{
    width: 17px;
    height: 17px;
}


/* =========================================================
   UNDERSTAND CONTENT
   ========================================================= */

#understandPanel .gl-understand-content
{
    display: flex;
    flex: 1 1 auto;
    flex-direction: column;

    min-height: 0;

    overflow-y: auto;

    padding: 1rem;

    overscroll-behavior: contain;

    scrollbar-width: thin;
    scrollbar-color:
        #c6d5e1
        transparent;
}


#understandPanel .gl-understand-content::-webkit-scrollbar
{
    width: 7px;
}


#understandPanel .gl-understand-content::-webkit-scrollbar-track
{
    background: transparent;
}


#understandPanel .gl-understand-content::-webkit-scrollbar-thumb
{
    border-radius: 999px;

    background: #c6d5e1;
}


/* =========================================================
   PROGRESS
   ========================================================= */

.gl-understand-progress
{
    margin-bottom: 1rem;
}


.gl-understand-progress-copy
{
    display: flex;
    align-items: center;
    justify-content: space-between;

    margin-bottom: 0.4rem;
}


.gl-understand-progress-copy span
{
    color: var(--gl-muted);

    font-size: 0.61rem;
    font-weight: 800;

    letter-spacing: 0.04em;
}


.gl-understand-progress-copy span:first-child
{
    color: var(--gl-teal-dark);
}


.gl-understand-progress-track
{
    position: relative;

    width: 100%;
    height: 6px;

    overflow: hidden;

    border-radius: 999px;

    background: #eaf0f5;
}


.gl-understand-progress-track > span
{
    display: block;

    height: 100%;

    border-radius: inherit;

    background:
        linear-gradient(
            90deg,
            var(--gl-teal),
            var(--gl-blue)
        );

    transition: width 0.25s ease;
}


/* =========================================================
   STEP CONTENT
   ========================================================= */

.gl-understand-step
{
    display: block;

    padding: 0;

    border: 0;

    background: transparent;
}


.gl-understand-step h4
{
    margin:
        0
        0
        0.85rem;

    color: var(--gl-navy);

    font-size: 1rem;
    font-weight: 800;

    line-height: 1.35;
}


.gl-understand-step p
{
    margin:
        0
        0
        0.85rem;

    color: var(--gl-muted);

    font-size: 0.76rem;
    line-height: 1.65;
}


.gl-understand-step p strong
{
    color: var(--gl-navy);

    font-weight: 800;
}


/* =========================================================
   TEACHING CALLOUT
   ========================================================= */

.gl-understand-callout
{
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;

    margin:
        0.9rem
        0;

    padding:
        0.85rem
        0.9rem;

    border: 1px solid rgba(21, 154, 156, 0.2);
    border-radius: 0.75rem;

    background: rgba(21, 154, 156, 0.055);
}


.gl-understand-callout span
{
    color: var(--gl-muted);

    font-size: 0.65rem;
    font-weight: 700;
}


.gl-understand-callout strong
{
    color: var(--gl-teal-dark);

    font-size: 0.95rem;
    font-weight: 800;
}


/* =========================================================
   IMPORTANT VALUE CARD
   ========================================================= */

.gl-understand-value
{
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;

    margin:
        0.85rem
        0;

    padding:
        0.8rem
        0.9rem;

    border: 1px solid var(--gl-border);
    border-radius: 0.7rem;

    background: var(--gl-lighter);
}


.gl-understand-value span
{
    color: var(--gl-muted);

    font-size: 0.65rem;
    font-weight: 700;

    text-transform: uppercase;

    letter-spacing: 0.04em;
}


.gl-understand-value strong
{
    color: var(--gl-navy);

    font-size: 1rem;
    font-weight: 800;
}


/* =========================================================
   RISE / RUN FRACTION DISPLAY
   ========================================================= */

.gl-understand-equation
{
    display: grid;
    grid-template-columns:
        1fr
        auto
        10px
        1fr
        auto;

    align-items: center;
    gap: 0.45rem;

    margin:
        0.9rem
        0;

    padding:
        0.8rem;

    border: 1px solid var(--gl-border);
    border-radius: 0.7rem;

    background: var(--gl-white);

    text-align: center;
}


.gl-understand-equation span
{
    color: var(--gl-muted);

    font-size: 0.65rem;
    font-weight: 700;
}


.gl-understand-equation strong
{
    color: var(--gl-navy);

    font-size: 1rem;
    font-weight: 800;
}


.gl-understand-divider
{
    width: 1px;
    height: 28px;

    background: var(--gl-border);
}


/* =========================================================
   MOVEMENT / RISE-RUN STEPS
   ========================================================= */

.gl-understand-movement
{
    display: grid;
    grid-template-columns:
        minmax(0, 1fr)
        auto
        minmax(0, 1fr);

    align-items: center;
    gap: 0.65rem;

    margin:
        0.9rem
        0;
}


.gl-understand-movement > div
{
    padding:
        0.75rem
        0.7rem;

    border: 1px solid var(--gl-border);
    border-radius: 0.7rem;

    background: var(--gl-lighter);

    text-align: center;
}


.gl-understand-movement > div > span
{
    display: flex;
    align-items: center;
    justify-content: center;

    width: 24px;
    height: 24px;

    margin:
        0 auto
        0.35rem;

    border-radius: 50%;

    background: rgba(21, 154, 156, 0.11);

    color: var(--gl-teal-dark);

    font-size: 0.65rem;
    font-weight: 800;
}


.gl-understand-movement strong
{
    color: var(--gl-navy);

    font-size: 0.7rem;
    font-weight: 800;
}


.gl-understand-movement > svg
{
    width: 18px;
    height: 18px;

    color: var(--gl-muted-light);
}


/* =========================================================
   FINAL SUMMARY
   ========================================================= */

.gl-understand-summary-card
{
    margin-bottom: 1rem;

    padding:
        0.8rem
        0.9rem;

    border: 1px solid rgba(21, 154, 156, 0.22);
    border-radius: 0.75rem;

    background: rgba(21, 154, 156, 0.055);
}


.gl-understand-summary-card span
{
    display: block;

    margin-bottom: 0.2rem;

    color: var(--gl-muted);

    font-size: 0.62rem;
    font-weight: 700;
}


.gl-understand-summary-card strong
{
    display: block;

    color: var(--gl-navy);

    font-size: 0.95rem;
    font-weight: 800;
}


.gl-understand-summary-list
{
    display: grid;

    gap: 0.55rem;
}


.gl-understand-summary-list > div
{
    display: grid;
    grid-template-columns:
        20px
        minmax(0, 1fr);

    align-items: flex-start;
    gap: 0.55rem;

    padding:
        0.65rem
        0.7rem;

    border: 1px solid var(--gl-border);
    border-radius: 0.65rem;

    background: var(--gl-white);
}


.gl-understand-summary-list svg
{
    width: 17px;
    height: 17px;

    margin-top: 0.1rem;

    color: var(--gl-teal-dark);
}


.gl-understand-summary-list p
{
    margin: 0;

    font-size: 0.7rem;
    line-height: 1.55;
}


/* =========================================================
   FINAL TAKEAWAY
   ========================================================= */

.gl-understand-takeaway
{
    margin-top: 1rem;

    padding:
        0.85rem
        0.9rem;

    border-radius: 0.75rem;

    background:
        linear-gradient(
            135deg,
            rgba(21, 154, 156, 0.09),
            rgba(31, 111, 139, 0.06)
        );
}


.gl-understand-takeaway > span
{
    display: block;

    margin-bottom: 0.3rem;

    color: var(--gl-teal-dark);

    font-size: 0.62rem;
    font-weight: 800;

    letter-spacing: 0.05em;

    text-transform: uppercase;
}


.gl-understand-takeaway p
{
    margin: 0;

    color: var(--gl-text);

    font-size: 0.73rem;
    line-height: 1.6;
}


/* =========================================================
   NAVIGATION
   ========================================================= */

.gl-understand-navigation
{
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.6rem;

    margin-top: auto;
    padding-top: 1.1rem;
}


.gl-understand-nav-button
{
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;

    min-height: 40px;

    padding:
        0.55rem
        0.8rem;

    border: 1px solid var(--gl-border);
    border-radius: 0.65rem;

    background: var(--gl-white);

    color: var(--gl-navy);

    font-size: 0.7rem;
    font-weight: 800;

    transition:
        border-color 0.2s ease,
        background-color 0.2s ease,
        color 0.2s ease,
        transform 0.2s ease;
}


.gl-understand-nav-button svg
{
    width: 15px;
    height: 15px;
}


.gl-understand-nav-button:hover:not(:disabled)
{
    border-color: rgba(21, 154, 156, 0.5);

    background: rgba(21, 154, 156, 0.05);

    color: var(--gl-teal-dark);

    transform: translateY(-1px);
}


.gl-understand-nav-button:disabled
{
    opacity: 0.4;

    cursor: not-allowed;
}


.gl-understand-nav-button-primary
{
    border-color: transparent;

    background:
        linear-gradient(
            135deg,
            var(--gl-teal),
            var(--gl-blue)
        );

    color: var(--gl-white);

    box-shadow:
        0 6px 15px rgba(21, 154, 156, 0.18);
}


.gl-understand-nav-button-primary:hover:not(:disabled)
{
    border-color: transparent;

    background:
        linear-gradient(
            135deg,
            var(--gl-teal-dark),
            var(--gl-blue)
        );

    color: var(--gl-white);
}


/* =========================================================
   EMPTY / COMING SOON STATE
   ========================================================= */

.gl-understand-empty
{
    display: flex;
    flex: 1 1 auto;
    flex-direction: column;
    align-items: center;
    justify-content: center;

    min-height: 250px;

    padding: 1rem;

    text-align: center;
}


.gl-understand-empty-icon
{
    display: flex;
    align-items: center;
    justify-content: center;

    width: 50px;
    height: 50px;

    margin-bottom: 0.9rem;

    border-radius: 50%;

    background: rgba(21, 154, 156, 0.1);

    color: var(--gl-teal-dark);
}


.gl-understand-empty-icon svg
{
    width: 22px;
    height: 22px;
}


.gl-understand-empty h4
{
    margin:
        0
        0
        0.45rem;

    color: var(--gl-navy);

    font-size: 0.95rem;
    font-weight: 800;
}


.gl-understand-empty p
{
    max-width: 300px;

    margin: 0;

    color: var(--gl-muted);

    font-size: 0.73rem;
    line-height: 1.6;
}


/* =========================================================
   TABLET / MOBILE — BOTTOM SHEET
   ========================================================= */

@media (max-width: 900px)
{
    #understandPanel
    {
        top: auto;
        right: 0;
        bottom: 0;
        left: 0;

        width: 100%;
        max-width: none;

        height: min(
            62vh,
            560px
        );

        border-top: 1px solid var(--gl-border);
        border-left: 0;

        border-radius:
            1rem
            1rem
            0
            0;

        box-shadow:
            0 -15px 38px rgba(16, 42, 67, 0.16);
    }


    #understandPanel::before
    {
        top: 0;
        right: 0;
        bottom: auto;
        left: 0;

        width: auto;
        height: 3px;
    }
}


/* =========================================================
   SMALL MOBILE
   ========================================================= */

@media (max-width: 500px)
{
    #understandPanel
    {
        height: min(
            66vh,
            540px
        );
    }


    #understandPanel .gl-understand-content
    {
        padding: 0.85rem;
    }


    .gl-understand-header
    {
        padding:
            0.8rem
            0.9rem;
    }


    .gl-understand-header h3
    {
        font-size: 0.88rem;
    }


    .gl-understand-movement
    {
        gap: 0.4rem;
    }


    .gl-understand-movement > div
    {
        padding:
            0.65rem
            0.5rem;
    }


    .gl-understand-navigation
    {
        position: sticky;
        bottom: -0.85rem;

        margin:
            1rem
            -0.85rem
            -0.85rem;

        padding:
            0.75rem
            0.85rem;

        border-top: 1px solid var(--gl-border);

        background: rgba(255, 255, 255, 0.97);

        backdrop-filter: blur(8px);
    }


    .gl-understand-nav-button
    {
        flex: 1 1 0;
    }
}

/* =========================================================
   TRANSFORMATION EQUATION COMPARISON
   ========================================================= */

.gl-transform-equation-comparison
{
    display: grid;
    grid-template-columns:
        minmax(0, 1fr)
        auto
        minmax(0, 1fr);

    align-items: center;
    gap: 0.65rem;

    margin:
        0.9rem
        0;
}


.gl-transform-equation-comparison > div
{
    min-width: 0;

    padding:
        0.75rem;

    border: 1px solid var(--gl-border);
    border-radius: 0.7rem;

    background: var(--gl-lighter);

    text-align: center;
}


.gl-transform-equation-comparison span
{
    display: block;

    margin-bottom: 0.25rem;

    color: var(--gl-muted);

    font-size: 0.6rem;
    font-weight: 800;

    text-transform: uppercase;
    letter-spacing: 0.04em;
}


.gl-transform-equation-comparison strong
{
    display: block;

    overflow-wrap: anywhere;

    color: var(--gl-navy);

    font-size: 0.78rem;
    font-weight: 800;

    line-height: 1.45;
}


.gl-transform-equation-comparison > svg
{
    width: 18px;
    height: 18px;

    color: var(--gl-teal-dark);
}


@media (max-width: 500px)
{
    .gl-transform-equation-comparison
    {
        grid-template-columns: 1fr;
    }


    .gl-transform-equation-comparison > svg
    {
        margin: 0 auto;

        transform: rotate(90deg);
    }
}

/* =========================================================
   CALCULATOR RESULT
   ========================================================= */

.gl-expression-row.is-calculation .gl-expression-meta
{
    margin-top: 0.35rem;
}

.gl-expression-row.is-calculation .gl-expression-type
{
    display: inline-flex;
    align-items: center;

    min-height: 34px;
    padding: 0.35rem 0.75rem;

    border: 1px solid rgba(21, 154, 156, 0.18);
    border-radius: 0.55rem;

    background: rgba(21, 154, 156, 0.07);

    color: var(--gl-navy-dark);

    font-size: 1rem;
    font-weight: 800;
    line-height: 1.25;

    font-variant-numeric: tabular-nums;
}