/* =========================================================
   UNIT CIRCLE PRACTICE
   Core styles
   ========================================================= */

:root {
    --ucp-navy: #0f172a;
    --ucp-slate: #475569;
    --ucp-muted: #64748b;
    --ucp-border: #dbe4ee;
    --ucp-border-strong: #cbd5e1;
    --ucp-surface: #ffffff;
    --ucp-surface-soft: #f8fafc;
    --ucp-surface-blue: #eff6ff;
    --ucp-surface-teal: #ecfdfb;
    --ucp-teal: #0f766e;
    --ucp-teal-dark: #115e59;
    --ucp-teal-light: #14b8a6;
    --ucp-blue: #2563eb;
    --ucp-violet: #7c3aed;
    --ucp-gold: #d97706;
    --ucp-green: #15803d;
    --ucp-radius: 1.1rem;
    --ucp-radius-small: 0.8rem;
    --ucp-shadow:
        0 16px 35px rgba(15, 23, 42, 0.08);
    --ucp-shadow-small:
        0 8px 22px rgba(15, 23, 42, 0.06);
}


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

#unit-circle-practice {
    scroll-margin-top: 6rem;
}

#unit-circle-practice > .container > .row > div > .lead {
    color: var(--ucp-navy);
    font-size: clamp(1.08rem, 1.8vw, 1.25rem);
    font-weight: 500;
    line-height: 1.75;
}

.ucp-card-eyebrow,
.ucp-level-label,
.ucp-problem-number,
.ucp-solution-label,
.ucp-visual-label {
    color: var(--ucp-teal);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.09em;
    line-height: 1.35;
    text-transform: uppercase;
}

.ucp-card-eyebrow,
.ucp-level-label,
.ucp-problem-number,
.ucp-solution-label,
.ucp-visual-label {
    margin-bottom: 0.6rem;
}


/* =========================================================
   INTRODUCTION CARD
   ========================================================= */

.ucp-intro-card {
    background:
        linear-gradient(
            135deg,
            var(--ucp-surface-teal),
            var(--ucp-surface-blue)
        );
    border: 1px solid #bfe3e2;
    border-radius: calc(var(--ucp-radius) + 0.15rem);
    box-shadow: var(--ucp-shadow);
    padding: clamp(1.4rem, 4vw, 2rem);
}

.ucp-intro-card h2 {
    color: var(--ucp-navy);
    font-weight: 800;
    letter-spacing: -0.02em;
}

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

.ucp-essentials-grid article {
    background: rgba(255, 255, 255, 0.82);
    border: 1px solid rgba(190, 220, 225, 0.95);
    border-radius: var(--ucp-radius-small);
    min-width: 0;
    padding: 1.15rem;
}

.ucp-essentials-grid h3 {
    color: var(--ucp-teal-dark);
    font-weight: 800;
    margin-bottom: 0.65rem;
}

.ucp-essentials-grid p {
    color: var(--ucp-slate);
    line-height: 1.65;
}

.ucp-mini-formula {
    color: var(--ucp-navy);
    overflow-x: auto;
    text-align: center;
}

.ucp-mini-formula mjx-container[display="true"] {
    margin: 0.4rem 0 !important;
}


/* =========================================================
   RESOURCE BUTTONS
   ========================================================= */

.ucp-resource-actions {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 0.85rem;
}

.ucp-resource-actions .btn {
    align-items: center;
    display: inline-flex;
    justify-content: center;
    min-height: 2.8rem;
}


/* =========================================================
   LEVEL HEADINGS
   ========================================================= */

.ucp-level-heading {
    background: var(--ucp-navy);
    border-radius: var(--ucp-radius);
    box-shadow: var(--ucp-shadow-small);
    color: #ffffff;
    margin-bottom: 1.25rem;
    overflow: hidden;
    padding: 1.4rem 1.5rem;
    position: relative;
}

.ucp-level-heading::after {
    background:
        radial-gradient(
            circle,
            rgba(45, 212, 191, 0.2) 0,
            rgba(45, 212, 191, 0) 70%
        );
    content: "";
    height: 12rem;
    pointer-events: none;
    position: absolute;
    right: -3rem;
    top: -5rem;
    width: 12rem;
}

.ucp-level-label {
    color: #5eead4;
    position: relative;
    z-index: 1;
}

.ucp-level-heading h2 {
    color: #ffffff;
    font-weight: 800;
    letter-spacing: -0.02em;
    position: relative;
    z-index: 1;
}

.ucp-level-heading > p:last-child {
    color: #cbd5e1;
    line-height: 1.65;
    max-width: 44rem;
    position: relative;
    z-index: 1;
}


/* =========================================================
   PROBLEM CARDS
   ========================================================= */

.ucp-problem-card {
    background: var(--ucp-surface);
    border: 1px solid var(--ucp-border);
    border-radius: var(--ucp-radius);
    box-shadow: var(--ucp-shadow-small);
    overflow: hidden;
    transition:
        border-color 180ms ease,
        box-shadow 180ms ease,
        transform 180ms ease;
}

.ucp-problem-card:hover {
    border-color: #acdcd6;
    box-shadow: var(--ucp-shadow);
    transform: translateY(-2px);
}

.ucp-problem-body {
    padding: clamp(1.25rem, 4vw, 1.7rem);
}

.ucp-problem-heading {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem 1rem;
    justify-content: space-between;
    margin-bottom: 0.9rem;
}

.ucp-problem-number {
    margin-bottom: 0;
}

.ucp-problem-skill {
    background: var(--ucp-surface-teal);
    border: 1px solid #b9e6df;
    border-radius: 999px;
    color: var(--ucp-teal-dark);
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.025em;
    padding: 0.4rem 0.7rem;
}

.ucp-problem-card h3 {
    color: var(--ucp-navy);
    font-weight: 750;
    line-height: 1.45;
}

.ucp-problem-expression {
    align-items: center;
    background:
        linear-gradient(
            135deg,
            var(--ucp-surface-soft),
            var(--ucp-surface-blue)
        );
    border: 1px solid var(--ucp-border);
    border-radius: var(--ucp-radius-small);
    color: var(--ucp-navy);
    display: flex;
    flex-direction: column;
    font-size: 1.08rem;
    justify-content: center;
    margin: 1.15rem 0 1.25rem;
    min-height: 5.5rem;
    overflow-x: auto;
    padding: 1rem 1.2rem;
    text-align: center;
}

.ucp-problem-expression mjx-container[display="true"] {
    margin: 0.35rem 0 !important;
}

.ucp-problem-card > .ucp-problem-body > .btn {
    min-width: 9.5rem;
}

.ucp-problem-card > .ucp-problem-body > .btn[aria-expanded="true"] {
    background: var(--ucp-navy);
    border-color: var(--ucp-navy);
    color: #ffffff;
}


/* =========================================================
   EXPANDABLE SOLUTIONS
   ========================================================= */

.ucp-solution {
    background: var(--ucp-surface-soft);
    border: 1px solid var(--ucp-border);
    border-radius: var(--ucp-radius-small);
    margin-top: 1.25rem;
    padding: clamp(1.1rem, 4vw, 1.5rem);
}

.ucp-solution-label {
    color: var(--ucp-teal);
}

.ucp-solution > p:not(.ucp-solution-label) {
    color: var(--ucp-slate);
    line-height: 1.72;
}

.ucp-solution h4 {
    color: var(--ucp-navy);
    font-weight: 800;
}

.ucp-solution-math {
    background: #ffffff;
    border: 1px solid var(--ucp-border);
    border-left: 4px solid var(--ucp-blue);
    border-radius: var(--ucp-radius-small);
    color: var(--ucp-navy);
    margin: 1rem 0;
    overflow-x: auto;
    padding: 0.9rem 1.1rem;
}

.ucp-solution-math mjx-container[display="true"] {
    margin: 0.45rem 0 !important;
}

.ucp-final-answer {
    background: var(--ucp-surface-teal);
    border: 1px solid #a7e4da;
    border-left: 5px solid var(--ucp-teal);
    border-radius: var(--ucp-radius-small);
    color: var(--ucp-teal-dark);
    line-height: 1.65;
    margin-top: 1.1rem;
    overflow-x: auto;
    padding: 1rem 1.15rem;
}

.ucp-final-answer strong {
    color: var(--ucp-teal-dark);
}

.ucp-final-answer mjx-container[display="true"] {
    margin: 0.45rem 0 !important;
}


/* =========================================================
   COLLAPSE MOTION
   ========================================================= */

.ucp-problem-card .collapsing {
    transition: height 250ms ease;
}

@media (prefers-reduced-motion: reduce) {
    .ucp-problem-card,
    .ucp-problem-card .collapsing {
        transition: none;
    }

    .ucp-problem-card:hover {
        transform: none;
    }
}

/* =========================================================
   SOLUTION VISUALS AND GRAPHS
   ========================================================= */

.ucp-solution-visual
{
    margin-top: 1.5rem;
    padding: clamp(1rem, 2vw, 1.5rem);
    background: #ffffff;
    border: 1px solid var(--ucp-border);
    border-radius: 1rem;
}

.ucp-visual-label
{
    margin: 0 0 0.85rem;
    color: var(--ucp-teal-dark);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    line-height: 1.3;
    text-transform: uppercase;
}

.ucp-graph
{
    position: relative;
    width: 100%;
    height: clamp(22rem, 48vw, 34rem);
    overflow: hidden;
    background: #ffffff;
    border: 1px solid var(--ucp-border);
    border-radius: 0.9rem;
    touch-action: pan-y;
}

.ucp-graph .jxgbox
{
    width: 100%;
    height: 100%;
    border: 0;
    background: transparent;
}

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


/* =========================================================
   FINAL PRACTICE REMINDER
   ========================================================= */

.ucp-reminder-card
{
    margin-top: clamp(2.75rem, 6vw, 5rem);
    padding: clamp(1.5rem, 4vw, 2.5rem);
    overflow: hidden;
    background:
        linear-gradient(
            135deg,
            rgba(20, 184, 166, 0.1),
            rgba(59, 130, 246, 0.08)
        );
    border: 1px solid rgba(13, 148, 136, 0.25);
    border-radius: 1.4rem;
}

.ucp-reminder-card h2
{
    margin: 0 0 0.75rem;
    color: var(--ucp-navy);
    font-size: clamp(1.55rem, 3vw, 2.15rem);
    font-weight: 800;
    line-height: 1.15;
}

.ucp-reminder-card > p
{
    max-width: 52rem;
    margin: 0;
    color: var(--ucp-slate);
    font-size: clamp(1rem, 1.7vw, 1.1rem);
    line-height: 1.75;
}

.ucp-process-list
{
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
    margin: 1.75rem 0 0;
    padding: 0;
    list-style: none;
    counter-reset: unit-circle-process;
}

.ucp-process-list li
{
    position: relative;
    min-height: 100%;
    padding: 3.5rem 1.15rem 1.15rem;
    color: var(--ucp-navy);
    font-size: 0.96rem;
    font-weight: 700;
    line-height: 1.55;
    background: rgba(255, 255, 255, 0.82);
    border: 1px solid rgba(148, 163, 184, 0.3);
    border-radius: 1rem;
    counter-increment: unit-circle-process;
}

.ucp-process-list li::before
{
    content: counter(unit-circle-process);
    position: absolute;
    top: 1rem;
    left: 1.15rem;
    display: grid;
    width: 2rem;
    height: 2rem;
    place-items: center;
    color: #ffffff;
    font-size: 0.88rem;
    font-weight: 800;
    background: var(--ucp-teal);
    border-radius: 50%;
}


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

.ucp-related-section
{
    margin-top: clamp(3.5rem, 7vw, 6rem);
}

.ucp-related-section h2
{
    margin: 0 0 0.6rem;
    color: var(--ucp-navy);
    font-size: clamp(1.8rem, 4vw, 2.55rem);
    font-weight: 800;
    line-height: 1.15;
}

.ucp-related-section > p
{
    max-width: 46rem;
    margin: 0 0 1.75rem;
    color: var(--ucp-slate);
    font-size: 1.05rem;
    line-height: 1.7;
}

.ucp-related-grid
{
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.15rem;
}

.ucp-related-card
{
    position: relative;

    display: flex;
    flex-direction: column;

    min-height: 100%;
    padding: 1.35rem;

    color: var(--ucp-navy);
    text-decoration: none;

    background: #ffffff;
    border: 1px solid var(--ucp-border);
    border-radius: 1.15rem;

    box-shadow:
        0 0.65rem 1.8rem rgba(15, 23, 42, 0.06);

    transition:
        transform 180ms ease,
        border-color 180ms ease,
        box-shadow 180ms ease;
}

.ucp-related-card:hover
{
    color: var(--ucp-navy);
    text-decoration: none;
    border-color: rgba(13, 148, 136, 0.5);
    box-shadow: 0 1rem 2.2rem rgba(15, 23, 42, 0.1);
    transform: translateY(-3px);
}

.ucp-related-card-inner
{
    display: flex;
    flex-direction: column;
    width: 100%;
}

.ucp-related-icon
{
    display: grid;

    width: 2.85rem;
    height: 2.85rem;

    margin-bottom: 1rem;

    place-items: center;

    color: var(--ucp-teal-dark);
    background: var(--ucp-surface-teal);

    border-radius: 0.85rem;

    flex: 0 0 auto;
}

.ucp-related-icon svg
{
    width: 1.35rem;
    height: 1.35rem;
    stroke-width: 2.25;
}

.ucp-related-card h3
{
    margin: 0 0 0.55rem;

    color: inherit;

    font-size: 1.08rem;
    font-weight: 800;
    line-height: 1.3;
}

.ucp-related-card p
{
    margin: 0;

    color: var(--ucp-slate);

    font-size: 0.94rem;
    line-height: 1.6;
}

.ucp-related-link
{
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    margin-top: auto;
    padding-top: 1rem;
    color: var(--ucp-teal-dark);
    font-size: 0.9rem;
    font-weight: 800;
}


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

.ucp-resource-actions a:focus-visible,
.ucp-solution summary:focus-visible,
.ucp-related-card:focus-visible
{
    outline: 3px solid rgba(37, 99, 235, 0.35);
    outline-offset: 4px;
}

.ucp-solution summary:focus-visible
{
    border-radius: 0.65rem;
}


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

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

    .ucp-process-list
    {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

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


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

@media (max-width: 767.98px)
{
    .ucp-intro-card
    {
        padding: 1.35rem;
        border-radius: 1.1rem;
    }

    .ucp-essentials-grid
    {
        grid-template-columns: 1fr;
        gap: 0.8rem;
    }

    .ucp-mini-formula
    {
        padding: 1rem;
    }

    .ucp-resource-actions
    {
        display: grid;
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .ucp-resource-actions .btn
    {
        width: 100%;
        justify-content: center;
    }

    .ucp-level-heading
    {
        align-items: flex-start;
        margin-top: 3rem;
    }

    .ucp-level-label
    {
        font-size: 0.72rem;
    }

    .ucp-problem-card
    {
        margin-bottom: 1rem;
        border-radius: 1.1rem;
    }

    .ucp-problem-body
    {
        padding: 1.2rem;
    }

    .ucp-problem-heading
    {
        align-items: flex-start;
        gap: 0.75rem;
    }

    .ucp-problem-number
    {
        flex: 0 0 2.15rem;
        width: 2.15rem;
        height: 2.15rem;
        font-size: 0.88rem;
    }

    .ucp-problem-skill
    {
        font-size: 0.72rem;
    }

    .ucp-problem-expression
    {
        margin-top: 1.15rem;
        padding: 1rem 0.8rem;
        font-size: clamp(1.25rem, 6vw, 1.7rem);
        overflow-wrap: anywhere;
    }

    .ucp-solution summary
    {
        min-height: 3.25rem;
        padding: 0.9rem 1rem;
        font-size: 0.92rem;
    }

    .ucp-solution-content
    {
        padding: 0 1rem 1.15rem;
    }

    .ucp-solution-math
    {
        padding: 0.9rem;
        font-size: 1rem;
        overflow-x: auto;
    }

    .ucp-final-answer
    {
        padding: 0.95rem;
        font-size: 1rem;
    }

    .ucp-solution-visual
    {
        padding: 0.65rem;
        border-radius: 0.85rem;
    }

    .ucp-graph
    {
        height: min(28rem, 110vw);
        min-height: 20rem;
        border-radius: 0.7rem;
    }

    .ucp-reminder-card
    {
        margin-top: 3rem;
        padding: 1.35rem;
        border-radius: 1.1rem;
    }

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

    .ucp-process-list li
    {
        padding: 1rem 1rem 1rem 3.8rem;
    }

    .ucp-process-list li::before
    {
        top: 50%;
        left: 1rem;
        transform: translateY(-50%);
    }

    .ucp-related-grid
    {
        grid-template-columns: 1fr;
    }

    .ucp-related-card
    {
        padding: 1.15rem;
    }
}


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

@media (max-width: 399.98px)
{
    .ucp-problem-body
    {
        padding: 1rem;
    }

    .ucp-problem-expression
    {
        font-size: 1.2rem;
    }

    .ucp-graph
    {
        height: 21rem;
    }
}


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

@media print
{
    .ucp-resource-actions,
    .ucp-related-section,
    .ucp-solution summary
    {
        display: none !important;
    }

    .ucp-problem-card,
    .ucp-intro-card,
    .ucp-reminder-card
    {
        break-inside: avoid;
        box-shadow: none;
    }

    .ucp-solution .collapse
    {
        display: block !important;
        height: auto !important;
    }

    .ucp-graph
    {
        height: 22rem;
    }
}