/* =========================================================
   SPECIAL RIGHT TRIANGLES GUIDE
   ========================================================= */

:root
{
    --srt-navy: #0f172a;
    --srt-slate: #475569;
    --srt-muted: #64748b;
    --srt-border: #d7e2ec;
    --srt-surface: #f8fafc;
    --srt-teal: #0f766e;
    --srt-teal-bright: #159e9c;
    --srt-teal-soft: #ecfdf5;
    --srt-blue: #2563eb;
    --srt-blue-soft: #eff6ff;
    --srt-violet: #7c3aed;
    --srt-violet-soft: #f5f3ff;
    --srt-gold: #d97706;
    --srt-gold-soft: #fff7ed;
    --srt-white: #ffffff;
    --srt-shadow: 0 1rem 2.5rem rgba(15, 23, 42, 0.08);
}


/* =========================================================
   GENERAL TYPOGRAPHY
   ========================================================= */

.srt-guide-intro,
.srt-content-section,
.srt-related-section
{
    color: var(--srt-slate);
    font-family: Inter, Arial, sans-serif;
}

.srt-content-section
{
    margin-top: clamp(4.5rem, 8vw, 7rem);
    scroll-margin-top: 2rem;
}

.srt-section-heading
{
    max-width: 52rem;
    margin-bottom: 1.5rem;
}

.srt-section-heading h2
{
    margin: 0;
    color: var(--srt-navy);
    font-size: clamp(1.85rem, 4vw, 2.65rem);
    font-weight: 800;
    letter-spacing: -0.035em;
    line-height: 1.12;
}

.srt-section-heading > p:last-child
{
    margin: 0.75rem 0 0;
    font-size: 1.05rem;
    line-height: 1.75;
}

.srt-content-section > p
{
    font-size: 1.05rem;
    line-height: 1.8;
}

.srt-eyebrow,
.srt-figure-eyebrow,
.srt-card-eyebrow,
.srt-example-label,
.srt-rule-label,
.srt-summary-label
{
    margin: 0 0 0.45rem;
    color: var(--srt-teal);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.105em;
    line-height: 1.3;
    text-transform: uppercase;
}


/* =========================================================
   TABLE OF CONTENTS
   ========================================================= */

.srt-toc
{
    padding: clamp(1.35rem, 3vw, 2rem);
    background:
        linear-gradient(
            135deg,
            rgba(236, 253, 245, 0.9),
            rgba(239, 246, 255, 0.85)
        );
    border: 1px solid rgba(13, 148, 136, 0.22);
    border-radius: 1.25rem;
}

.srt-toc h2
{
    color: var(--srt-navy);
    font-weight: 800;
}

.srt-toc ul
{
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem 1.5rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.srt-toc a
{
    position: relative;
    display: inline-block;
    padding-left: 1.1rem;
    color: var(--srt-teal);
    font-weight: 700;
    line-height: 1.5;
    text-decoration: none;
}

.srt-toc a::before
{
    content: "";
    position: absolute;
    top: 0.62em;
    left: 0;
    width: 0.4rem;
    height: 0.4rem;
    background: var(--srt-teal-bright);
    border-radius: 50%;
}

.srt-toc a:hover
{
    color: var(--srt-navy);
    text-decoration: underline;
    text-underline-offset: 0.2rem;
}


/* =========================================================
   TRIANGLE FAMILY OVERVIEW
   ========================================================= */

.srt-family-grid
{
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
    margin-top: 2rem;
}

.srt-family-card
{
    position: relative;
    display: flex;
    min-height: 100%;
    flex-direction: column;
    padding: clamp(1.4rem, 3vw, 2rem);
    overflow: hidden;
    background: var(--srt-white);
    border: 1px solid var(--srt-border);
    border-radius: 1.25rem;
    box-shadow: 0 0.8rem 2rem rgba(15, 23, 42, 0.06);
}

.srt-family-card::after
{
    content: "";
    position: absolute;
    right: -3rem;
    bottom: -4rem;
    width: 10rem;
    height: 10rem;
    background: rgba(21, 158, 156, 0.07);
    border-radius: 50%;
    pointer-events: none;
}

.srt-family-icon
{
    display: grid;
    width: 3.25rem;
    height: 3.25rem;
    margin-bottom: 1rem;
    place-items: center;
    color: var(--srt-teal);
    background: var(--srt-teal-soft);
    border-radius: 0.95rem;
}

.srt-family-icon svg
{
    width: 1.55rem;
    height: 1.55rem;
    stroke-width: 2.1;
}

.srt-family-label
{
    margin: 0 0 0.4rem;
    color: var(--srt-muted);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

.srt-family-card h3
{
    margin: 0;
    color: var(--srt-navy);
    font-size: clamp(1.25rem, 2.5vw, 1.55rem);
    font-weight: 800;
    line-height: 1.25;
}

.srt-family-card > p:not(.srt-family-label)
{
    color: var(--srt-slate);
    line-height: 1.7;
}

.srt-family-card > a
{
    position: relative;
    z-index: 1;
    display: inline-flex;
    align-items: center;
    margin-top: auto;
    padding-top: 0.75rem;
    color: var(--srt-teal);
    font-size: 0.9rem;
    font-weight: 800;
    text-decoration: none;
}

.srt-family-card > a:hover
{
    color: var(--srt-navy);
}

.srt-ratio-display
{
    display: grid;
    min-height: 5rem;
    margin: 1.1rem 0;
    place-items: center;
    color: var(--srt-teal);
    font-size: clamp(1.35rem, 3vw, 1.8rem);
    font-weight: 800;
    background: var(--srt-teal-soft);
    border: 1px solid rgba(13, 148, 136, 0.18);
    border-radius: 0.9rem;
}

.srt-ratio-display mjx-container,
.srt-rule-formula mjx-container,
.srt-step-math mjx-container,
.srt-answer-box mjx-container,
.srt-formula-badge mjx-container
{
    margin: 0 !important;
}


/* =========================================================
   KEY POINT AND WARNING CALLOUTS
   ========================================================= */

.srt-key-point,
.srt-warning-card
{
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    margin-top: 1.5rem;
    padding: 1.25rem 1.35rem;
    border-radius: 1rem;
}

.srt-key-point
{
    background: var(--srt-teal-soft);
    border: 1px solid rgba(13, 148, 136, 0.25);
}

.srt-warning-card
{
    background: var(--srt-gold-soft);
    border: 1px solid rgba(217, 119, 6, 0.27);
}

.srt-key-point-icon,
.srt-warning-icon
{
    display: grid;
    flex: 0 0 2.65rem;
    width: 2.65rem;
    height: 2.65rem;
    place-items: center;
    border-radius: 0.8rem;
}

.srt-key-point-icon
{
    color: var(--srt-teal);
    background: rgba(20, 184, 166, 0.13);
}

.srt-warning-icon
{
    color: var(--srt-gold);
    background: rgba(245, 158, 11, 0.14);
}

.srt-key-point-icon svg,
.srt-warning-icon svg
{
    width: 1.25rem;
    height: 1.25rem;
}

.srt-key-point-label,
.srt-warning-label
{
    margin: 0 0 0.25rem;
    color: var(--srt-navy);
    font-size: 0.92rem;
    font-weight: 800;
}

.srt-key-point p:last-child,
.srt-warning-card p:last-child
{
    color: var(--srt-slate);
    line-height: 1.65;
}


/* =========================================================
   GRAPH FIGURES
   ========================================================= */

.srt-figure
{
    margin: 2rem 0;
    overflow: hidden;
    background: var(--srt-white);
    border: 1px solid var(--srt-border);
    border-radius: 1.35rem;
    box-shadow: var(--srt-shadow);
}

.srt-figure-header
{
    display: flex;
    gap: 1.25rem;
    align-items: center;
    justify-content: space-between;
    padding: 1.4rem 1.6rem;
    background:
        linear-gradient(
            135deg,
            rgba(236, 253, 245, 0.88),
            rgba(239, 246, 255, 0.85)
        );
    border-bottom: 1px solid var(--srt-border);
}

.srt-figure-header h3
{
    margin: 0;
    color: var(--srt-navy);
    font-size: clamp(1.2rem, 2.6vw, 1.55rem);
    font-weight: 800;
    line-height: 1.3;
}

.srt-formula-badge
{
    display: grid;
    flex: 0 0 auto;
    min-height: 3.25rem;
    padding: 0.55rem 1.1rem;
    place-items: center;
    color: var(--srt-teal);
    font-size: 1.1rem;
    font-weight: 800;
    background: rgba(255, 255, 255, 0.86);
    border: 1px solid rgba(13, 148, 136, 0.24);
    border-radius: 999px;
}

.srt-graph
{
    position: relative;
    width: 100%;
    height: clamp(28rem, 53vw, 38rem);
    overflow: hidden;
    background: var(--srt-white);
    touch-action: pan-y;
}

.srt-unit-circle-graph
{
    height: clamp(30rem, 56vw, 40rem);
}

.srt-graph.jxgbox,
.srt-example-graph.jxgbox
{
    border: 0;
}

.srt-graph .JXGtext,
.srt-example-graph .JXGtext
{
    font-family: Inter, Arial, sans-serif !important;
}

.srt-figure figcaption
{
    margin: 0;
    padding: 1rem 1.5rem;
    color: var(--srt-slate);
    font-size: 0.98rem;
    line-height: 1.65;
    text-align: center;
    background: var(--srt-surface);
    border-top: 1px solid var(--srt-border);
}


/* =========================================================
   SIDE BREAKDOWN
   ========================================================= */

.srt-side-breakdown
{
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}

.srt-side-breakdown article
{
    padding: 1.25rem;
    text-align: center;
    background: var(--srt-white);
    border: 1px solid var(--srt-border);
    border-top: 4px solid var(--srt-teal);
    border-radius: 1rem;
}

.srt-side-name
{
    margin: 0;
    color: var(--srt-muted);
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.srt-side-value
{
    margin: 0.75rem 0;
    color: var(--srt-teal);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 800;
}

.srt-side-breakdown article > p:last-child
{
    margin: 0;
    color: var(--srt-slate);
    font-size: 0.9rem;
    line-height: 1.55;
}


/* =========================================================
   RULE CARDS
   ========================================================= */

.srt-rule-card
{
    display: grid;
    grid-template-columns: 5.5rem minmax(0, 1fr);
    gap: 1.35rem;
    margin: 2rem 0;
    padding: clamp(1.35rem, 3vw, 2rem);
    color: var(--srt-navy);
    background: var(--srt-blue-soft);
    border: 1px solid rgba(37, 99, 235, 0.22);
    border-radius: 1.2rem;
}

.srt-rule-card-gold
{
    background: var(--srt-gold-soft);
    border-color: rgba(217, 119, 6, 0.24);
}

.srt-rule-number
{
    display: grid;
    width: 5.25rem;
    height: 5.25rem;
    place-items: center;
    color: var(--srt-white);
    font-size: 1.65rem;
    font-weight: 800;
    background: var(--srt-blue);
    border-radius: 1.1rem;
}

.srt-rule-card-gold .srt-rule-number
{
    background: var(--srt-gold);
}

.srt-rule-card h3
{
    margin: 0;
    color: var(--srt-navy);
    font-size: 1.45rem;
    font-weight: 800;
}

.srt-rule-formula
{
    display: inline-grid;
    min-height: 3.5rem;
    margin: 1rem 0;
    padding: 0.45rem 1rem;
    place-items: center;
    color: var(--srt-blue);
    font-size: 1.35rem;
    font-weight: 800;
    background: rgba(255, 255, 255, 0.78);
    border-radius: 0.75rem;
}

.srt-rule-card-gold .srt-rule-formula
{
    color: var(--srt-gold);
}

.srt-rule-card ul
{
    margin: 0;
    padding-left: 1.25rem;
    color: var(--srt-slate);
}

.srt-rule-card li
{
    margin-bottom: 0.45rem;
    line-height: 1.6;
}

.srt-rule-card li:last-child
{
    margin-bottom: 0;
}


/* =========================================================
   WORKED EXAMPLES
   ========================================================= */

.srt-example-card
{
    margin-top: 1.5rem;
    padding: clamp(1.35rem, 3.5vw, 2.25rem);
    background: var(--srt-white);
    border: 1px solid var(--srt-border);
    border-radius: 1.25rem;
    box-shadow: 0 0.8rem 2.25rem rgba(15, 23, 42, 0.06);
}

.srt-example-heading
{
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 1.25rem;
}

.srt-example-heading h3
{
    margin: 0;
    color: var(--srt-navy);
    font-size: clamp(1.3rem, 3vw, 1.75rem);
    font-weight: 800;
    line-height: 1.25;
}

.srt-difficulty
{
    flex: 0 0 auto;
    padding: 0.42rem 0.72rem;
    color: var(--srt-blue);
    font-size: 0.68rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    background: var(--srt-blue-soft);
    border-radius: 999px;
}

.srt-example-card > p
{
    color: var(--srt-slate);
    line-height: 1.75;
}

.srt-example-layout
{
    display: grid;
    grid-template-columns: minmax(16rem, 0.85fr) minmax(0, 1.15fr);
    gap: 1.5rem;
    align-items: stretch;
    margin-top: 1.5rem;
}

.srt-example-diagram
{
    min-width: 0;
    overflow: hidden;
    background:
        linear-gradient(
            145deg,
            var(--srt-surface),
            var(--srt-teal-soft)
        );
    border: 1px solid var(--srt-border);
    border-radius: 1rem;
}

.srt-example-graph
{
    position: relative;
    width: 100%;
    height: 22rem;
    overflow: hidden;
    background: transparent;
    touch-action: pan-y;
}

.srt-example-steps
{
    padding: 1.25rem;
    background: var(--srt-surface);
    border: 1px solid var(--srt-border);
    border-radius: 1rem;
}

.srt-example-steps ol
{
    margin: 0;
    padding-left: 1.35rem;
}

.srt-example-steps li
{
    margin-bottom: 1.15rem;
    padding-left: 0.35rem;
    color: var(--srt-slate);
}

.srt-example-steps li::marker
{
    color: var(--srt-teal);
    font-weight: 800;
}

.srt-example-steps li > strong
{
    color: var(--srt-navy);
}

.srt-example-steps li p
{
    margin: 0.3rem 0 0;
    line-height: 1.6;
}

.srt-step-math
{
    margin-top: 0.55rem;
    padding: 0.7rem;
    overflow-x: auto;
    color: var(--srt-teal);
    font-weight: 700;
    text-align: center;
    background: var(--srt-white);
    border: 1px solid var(--srt-border);
    border-radius: 0.7rem;
}

.srt-answer-box
{
    display: flex;
    gap: 1rem;
    align-items: center;
    justify-content: space-between;
    margin-top: 1.25rem;
    padding: 1rem 1.2rem;
    color: var(--srt-teal);
    font-size: 1.1rem;
    font-weight: 800;
    background: var(--srt-teal-soft);
    border: 1px solid rgba(13, 148, 136, 0.25);
    border-radius: 0.85rem;
}

.srt-answer-box > span
{
    color: var(--srt-navy);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.srt-equation-steps
{
    display: grid;
    gap: 0.8rem;
    margin-top: 1.5rem;
}

.srt-equation-row
{
    display: grid;
    grid-template-columns: minmax(10rem, 0.8fr) minmax(0, 1.2fr);
    gap: 1rem;
    align-items: center;
    min-height: 4.75rem;
    padding: 0.8rem 1rem;
    overflow-x: auto;
    color: var(--srt-teal);
    background: var(--srt-surface);
    border: 1px solid var(--srt-border);
    border-radius: 0.85rem;
}

.srt-equation-row mjx-container
{
    margin: 0 !important;
    text-align: center !important;
}

.srt-equation-note
{
    color: var(--srt-slate);
    font-size: 0.88rem;
    font-weight: 700;
    line-height: 1.45;
}

/* =========================================================
   PROCESS CARDS
   ========================================================= */

.srt-process-grid
{
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.srt-process-card
{
    position: relative;
    min-height: 100%;
    padding: 4.25rem 1.15rem 1.25rem;
    background: var(--srt-white);
    border: 1px solid var(--srt-border);
    border-radius: 1rem;
}

.srt-process-number
{
    position: absolute;
    top: 1.15rem;
    left: 1.15rem;
    display: grid;
    width: 2.35rem;
    height: 2.35rem;
    place-items: center;
    color: var(--srt-white);
    font-size: 0.88rem;
    font-weight: 800;
    background: var(--srt-teal);
    border-radius: 50%;
}

.srt-process-card h3
{
    margin: 0 0 0.6rem;
    color: var(--srt-navy);
    font-size: 1rem;
    font-weight: 800;
    line-height: 1.35;
}

.srt-process-card p
{
    margin: 0;
    color: var(--srt-slate);
    font-size: 0.9rem;
    line-height: 1.65;
}


/* =========================================================
   DECISION GUIDE
   ========================================================= */

.srt-decision-card,
.srt-values-card
{
    margin-top: 2rem;
    overflow: hidden;
    background: var(--srt-white);
    border: 1px solid var(--srt-border);
    border-radius: 1.25rem;
    box-shadow: 0 0.8rem 2rem rgba(15, 23, 42, 0.06);
}

.srt-decision-heading,
.srt-values-heading
{
    padding: 1.4rem 1.6rem;
    background:
        linear-gradient(
            135deg,
            rgba(236, 253, 245, 0.88),
            rgba(239, 246, 255, 0.85)
        );
    border-bottom: 1px solid var(--srt-border);
}

.srt-decision-heading h3,
.srt-values-heading h3
{
    margin: 0;
    color: var(--srt-navy);
    font-size: clamp(1.25rem, 2.8vw, 1.65rem);
    font-weight: 800;
}

.srt-values-heading > p:last-child
{
    margin: 0.65rem 0 0;
    color: var(--srt-slate);
    line-height: 1.65;
}

.srt-decision-table-wrap,
.srt-values-table-wrap
{
    width: 100%;
    overflow-x: auto;
}

.srt-decision-table,
.srt-values-table
{
    width: 100%;
    min-width: 42rem;
    margin: 0;
    border-collapse: collapse;
}

.srt-decision-table th,
.srt-decision-table td,
.srt-values-table th,
.srt-values-table td
{
    padding: 1rem 1.15rem;
    vertical-align: middle;
    border-bottom: 1px solid var(--srt-border);
}

.srt-decision-table thead th,
.srt-values-table thead th
{
    color: var(--srt-white);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.055em;
    text-transform: uppercase;
    background: var(--srt-navy);
}

.srt-decision-table tbody td,
.srt-values-table tbody td,
.srt-values-table tbody th
{
    color: var(--srt-slate);
    font-size: 0.95rem;
    line-height: 1.5;
}

.srt-decision-table tbody tr:nth-child(even),
.srt-values-table tbody tr:nth-child(even)
{
    background: var(--srt-surface);
}

.srt-decision-table tbody tr:last-child td,
.srt-values-table tbody tr:last-child td,
.srt-values-table tbody tr:last-child th
{
    border-bottom: 0;
}

.srt-decision-table td:last-child
{
    color: var(--srt-teal);
    font-weight: 800;
}

.srt-values-table
{
    text-align: center;
}

.srt-values-table tbody th
{
    color: var(--srt-navy);
    font-weight: 800;
}


/* =========================================================
   COMMON MISTAKES
   ========================================================= */

.srt-mistakes-grid
{
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.srt-mistake-card
{
    display: flex;
    min-height: 100%;
    flex-direction: column;
    padding: 1.35rem;
    background: var(--srt-white);
    border: 1px solid var(--srt-border);
    border-radius: 1rem;
}

.srt-mistake-icon
{
    display: grid;
    width: 2.75rem;
    height: 2.75rem;
    margin-bottom: 1rem;
    place-items: center;
    color: var(--srt-gold);
    background: var(--srt-gold-soft);
    border-radius: 0.8rem;
}

.srt-mistake-icon svg
{
    width: 1.25rem;
    height: 1.25rem;
    stroke-width: 2.2;
}

.srt-mistake-card h3
{
    margin: 0 0 0.6rem;
    color: var(--srt-navy);
    font-size: 1.08rem;
    font-weight: 800;
    line-height: 1.35;
}

.srt-mistake-card > p
{
    margin-bottom: 1rem;
    color: var(--srt-slate);
    font-size: 0.94rem;
    line-height: 1.65;
}

.srt-mistake-reminder
{
    margin-top: auto;
    padding: 0.85rem 0.95rem;
    color: var(--srt-teal);
    font-size: 0.88rem;
    line-height: 1.55;
    background: var(--srt-teal-soft);
    border-left: 4px solid var(--srt-teal);
    border-radius: 0.55rem;
}

.srt-mistake-reminder mjx-container
{
    margin: 0 !important;
}


/* =========================================================
   PRACTICE PANEL
   ========================================================= */

.srt-practice-panel
{
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(16rem, 0.75fr);
    gap: 1.5rem;
    padding: clamp(1.5rem, 4vw, 2.75rem);
    overflow: hidden;
    color: var(--srt-white);
    background:
        radial-gradient(
            circle at top right,
            rgba(20, 184, 166, 0.24),
            transparent 36%
        ),
        var(--srt-navy);
    border-radius: 1.4rem;
    box-shadow: 0 1.4rem 3rem rgba(15, 23, 42, 0.16);
}

.srt-practice-content .srt-eyebrow
{
    color: #5eead4;
}

.srt-practice-content h2
{
    margin: 0 0 0.85rem;
    color: var(--srt-white);
    font-size: clamp(1.75rem, 4vw, 2.4rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.15;
}

.srt-practice-content > p
{
    max-width: 44rem;
    margin-bottom: 1.4rem;
    color: #cbd5e1;
    line-height: 1.75;
}

.srt-practice-actions
{
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.srt-practice-actions .btn-outline-dark
{
    color: var(--srt-white);
    border-color: rgba(255, 255, 255, 0.55);
}

.srt-practice-actions .btn-outline-dark:hover
{
    color: var(--srt-navy);
    background: var(--srt-white);
    border-color: var(--srt-white);
}

.srt-summary-card
{
    align-self: stretch;
    padding: 1.25rem;
    color: var(--srt-navy);
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid rgba(255, 255, 255, 0.65);
    border-radius: 1rem;
}

.srt-summary-label
{
    color: var(--srt-teal);
}

.srt-summary-rule
{
    padding: 0.85rem;
    text-align: center;
    background: var(--srt-surface);
    border: 1px solid var(--srt-border);
    border-radius: 0.75rem;
}

.srt-summary-rule + .srt-summary-rule
{
    margin-top: 0.75rem;
}

.srt-summary-rule > span
{
    display: block;
    color: var(--srt-slate);
    font-size: 0.82rem;
    font-weight: 800;
}

.srt-summary-rule > strong
{
    display: block;
    margin-top: 0.35rem;
    color: var(--srt-teal);
    font-size: 1.15rem;
}

.srt-summary-rule mjx-container
{
    margin: 0 !important;
}


/* =========================================================
   RELATED RESOURCES
   ========================================================= */

.srt-related-section
{
    margin-top: clamp(4.5rem, 8vw, 7rem);
}

.srt-related-grid
{
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.srt-related-card
{
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 1rem;
    align-items: center;
    min-height: 100%;
    padding: 1.2rem;
    color: var(--srt-navy);
    text-decoration: none;
    background: var(--srt-white);
    border: 1px solid var(--srt-border);
    border-radius: 1rem;
    box-shadow: 0 0.6rem 1.7rem rgba(15, 23, 42, 0.05);
    transition:
        transform 180ms ease,
        border-color 180ms ease,
        box-shadow 180ms ease;
}

.srt-related-card:hover
{
    color: var(--srt-navy);
    text-decoration: none;
    border-color: rgba(13, 148, 136, 0.48);
    box-shadow: 0 0.9rem 2rem rgba(15, 23, 42, 0.09);
    transform: translateY(-3px);
}

.srt-related-icon
{
    display: grid;
    width: 2.85rem;
    height: 2.85rem;
    place-items: center;
    color: var(--srt-teal);
    background: var(--srt-teal-soft);
    border-radius: 0.85rem;
}

.srt-related-icon svg
{
    width: 1.3rem;
    height: 1.3rem;
    stroke-width: 2.2;
}

.srt-related-content
{
    display: block;
    min-width: 0;
}

.srt-related-content strong
{
    display: block;
    margin-bottom: 0.3rem;
    color: var(--srt-navy);
    font-size: 0.98rem;
    font-weight: 800;
    line-height: 1.35;
}

.srt-related-content > span
{
    display: block;
    color: var(--srt-slate);
    font-size: 0.86rem;
    line-height: 1.55;
}

.srt-related-card > svg,
.srt-related-card > .fa-arrow-right
{
    color: var(--srt-teal);
}


/* =========================================================
   ACCESSIBILITY
   ========================================================= */

.srt-toc a:focus-visible,
.srt-family-card > a:focus-visible,
.srt-practice-actions a:focus-visible,
.srt-related-card:focus-visible
{
    outline: 3px solid rgba(37, 99, 235, 0.38);
    outline-offset: 4px;
}


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

@media (max-width: 991.98px)
{
    .srt-process-grid
    {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .srt-example-layout
    {
        grid-template-columns: 1fr;
    }

    .srt-example-graph
    {
        height: 25rem;
    }

    .srt-practice-panel
    {
        grid-template-columns: 1fr;
    }

    .srt-summary-card
    {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 0.75rem;
    }

    .srt-summary-label
    {
        grid-column: 1 / -1;
    }

    .srt-summary-rule + .srt-summary-rule
    {
        margin-top: 0;
    }
}


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

@media (max-width: 767.98px)
{
    .srt-content-section
    {
        margin-top: 4rem;
        scroll-margin-top: 1rem;
    }

    .srt-guide-intro .lead,
    .srt-content-section > p
    {
        font-size: 1rem;
        line-height: 1.72;
    }

    .srt-toc
    {
        padding: 1.2rem;
        border-radius: 1rem;
    }

    .srt-toc ul
    {
        grid-template-columns: 1fr;
        gap: 0.65rem;
    }

    .srt-family-grid,
    .srt-side-breakdown,
    .srt-mistakes-grid,
    .srt-related-grid
    {
        grid-template-columns: 1fr;
    }

    .srt-family-card
    {
        padding: 1.25rem;
        border-radius: 1rem;
    }

    .srt-key-point,
    .srt-warning-card
    {
        padding: 1rem;
    }

    .srt-figure
    {
        border-radius: 1.05rem;
    }

    .srt-figure-header
    {
        align-items: flex-start;
        flex-direction: column;
        padding: 1.2rem;
    }

    .srt-formula-badge
    {
        align-self: flex-start;
        font-size: 1rem;
    }

    .srt-graph,
	.srt-unit-circle-graph
	{
	    width: 100%;
	    height: clamp(18rem, 78vw, 22rem);
	    min-height: 0;
	}

    .srt-figure figcaption
    {
        padding: 1rem;
        font-size: 0.92rem;
    }

    .srt-side-breakdown
    {
        gap: 0.75rem;
    }

    .srt-side-breakdown article
    {
        display: grid;
        grid-template-columns: minmax(7rem, 0.8fr) auto minmax(8rem, 1fr);
        gap: 0.75rem;
        align-items: center;
        padding: 0.9rem 1rem;
        text-align: left;
        border-top: 1px solid var(--srt-border);
        border-left: 4px solid var(--srt-teal);
    }

    .srt-side-value
    {
        margin: 0;
        text-align: center;
    }

    .srt-side-breakdown article > p:last-child
    {
        text-align: right;
    }

    .srt-rule-card
    {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 1.25rem;
    }

    .srt-rule-number
    {
        width: 3.5rem;
        height: 3.5rem;
        font-size: 1.15rem;
        border-radius: 0.85rem;
    }

    .srt-example-card
    {
        padding: 1.2rem;
        border-radius: 1rem;
    }

    .srt-example-heading
    {
        align-items: flex-start;
        flex-direction: column;
    }

    .srt-example-graph
    {
        height: min(25rem, 105vw);
        min-height: 20rem;
    }

    .srt-example-steps
    {
        padding: 1rem;
    }

    .srt-answer-box
	{
	    align-items: flex-start;
	    flex-direction: column;
	    gap: 0.55rem;

	    width: 100%;
	    min-width: 0;
	}
	.srt-answer-box mjx-container
	{
	    max-width: 100%;

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

	.srt-answer-box mjx-container[display="true"]
	{
	    margin: 0 !important;
	}

    .srt-equation-row
    {
        grid-template-columns: 1fr;
        gap: 0.5rem;
        min-height: auto;
        padding: 0.9rem;
    }

    .srt-equation-note
    {
        text-align: center;
    }

    .srt-process-grid
    {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .srt-process-card
    {
        min-height: auto;
        padding: 1rem 1rem 1rem 4.15rem;
    }

    .srt-process-number
    {
        top: 50%;
        left: 1rem;
        transform: translateY(-50%);
    }

    .srt-decision-heading,
    .srt-values-heading
    {
        padding: 1.2rem;
    }

    .srt-decision-table th,
    .srt-decision-table td,
    .srt-values-table th,
    .srt-values-table td
    {
        padding: 0.85rem;
        font-size: 0.86rem;
    }

    .srt-mistake-card
    {
        padding: 1.15rem;
    }

    .srt-practice-panel
    {
        padding: 1.35rem;
        border-radius: 1.1rem;
    }

    .srt-practice-actions
    {
        display: grid;
        grid-template-columns: 1fr;
    }

    .srt-practice-actions .btn
    {
        width: 100%;
        justify-content: center;
    }

    .srt-summary-card
    {
        grid-template-columns: 1fr;
    }

    .srt-summary-rule + .srt-summary-rule
    {
        margin-top: 0;
    }

    .srt-related-card
    {
        padding: 1rem;
    }

    #thirtySixtyTriangleGraph
	{
	    height: clamp(17rem, 72vw, 20rem);
	    min-height: 0;
	}
}


/* =========================================================
   VERY SMALL SCREENS
   ========================================================= */

@media (max-width: 399.98px)
{
    .srt-side-breakdown article
    {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .srt-side-breakdown article > p:last-child
    {
        text-align: center;
    }

    .srt-graph,
	.srt-unit-circle-graph
	{
	    height: 18rem;
	}

	#thirtySixtyTriangleGraph
	{
	    height: 17rem;
	}

    .srt-example-graph
    {
        height: 20rem;
    }
}


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

@media (prefers-reduced-motion: reduce)
{
    .srt-related-card
    {
        transition: none;
    }
}


/* =========================================================
   PRINT
   ========================================================= */

@media print
{
    .srt-practice-actions,
    .srt-related-section
    {
        display: none !important;
    }

    .srt-family-card,
    .srt-figure,
    .srt-rule-card,
    .srt-example-card,
    .srt-decision-card,
    .srt-values-card,
    .srt-mistake-card,
    .srt-practice-panel
    {
        break-inside: avoid;
        box-shadow: none;
    }

    .srt-graph,
    .srt-unit-circle-graph
    {
        height: 28rem;
    }

    .srt-example-graph
    {
        height: 20rem;
    }
}