/* ============================================
   Ms. Brandolini's Science — Shared Styles
   ============================================ */

:root {
    /* Backgrounds */
    --bg-deep: #0a0e1a;
    --bg-card: #111827;
    --bg-card-hover: #1a2234;

    /* Course accent colors (see styles/REFERENCE.md) */
    --accent-bio: #34d399;
    --accent-env: #60a5fa;
    --accent-chem: #f472b6;
    --accent-earth: #d97706;
    --accent-anat: #f87171;
    --accent-crim: #a78bfa;
    --accent-ocean: #22d3ee;
    --accent-phys: #facc15;
    --accent-astro: #c084fc;
    --accent-warm: #fbbf24;

    /* Text */
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-dim: #64748b;

    /* Borders */
    --border-subtle: rgba(255,255,255,0.06);
    --border-hover: rgba(255,255,255,0.12);

    /* Radii */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'DM Sans', sans-serif;
    background: var(--bg-deep);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ---- Ambient Background ---- */
.bg-atmosphere {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
}

.bg-atmosphere::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(52, 211, 153, 0.04) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(96, 165, 250, 0.04) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(244, 114, 182, 0.03) 0%, transparent 50%);
}

.bg-atmosphere::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
    background-size: 60px 60px;
}

/* ---- Layout ---- */
.page-wrap {
    position: relative;
    z-index: 1;
    min-height: 100vh;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.container--narrow {
    max-width: 800px;
}

/* ---- Topbar ---- */
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 2rem;
    border-bottom: 1px solid var(--border-subtle);
}

.topbar-brand {
    font-family: 'Source Serif 4', serif;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: color 0.2s;
}

.topbar-brand:hover {
    color: var(--text-primary);
}

.topbar-nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.topbar-link {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-dim);
    letter-spacing: 0.03em;
    transition: color 0.2s;
}

.topbar-link:hover {
    color: var(--text-primary);
}

.topbar-role {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0.35rem 0.85rem;
    border-radius: 100px;
    border: 1px solid var(--border-subtle);
    color: var(--text-dim);
    flex-shrink: 0;
    white-space: nowrap;
}

.topbar-role--student { border-color: rgba(52, 211, 153, 0.3); color: var(--accent-bio); }
.topbar-role--teacher { border-color: rgba(251, 191, 36, 0.3); color: var(--accent-warm); }

/* ---- Typography ---- */
.heading-display {
    font-family: 'Source Serif 4', serif;
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    font-weight: 600;
    line-height: 1.1;
    margin-bottom: 1rem;
}

.heading-section {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.text-gradient-bio {
    background: linear-gradient(135deg, var(--accent-bio), var(--accent-env));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-gradient-warm {
    background: linear-gradient(135deg, var(--accent-warm), #fb923c);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-sub {
    font-size: 1.15rem;
    color: var(--text-secondary);
    font-weight: 300;
    line-height: 1.6;
}

.tag-label {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-dim);
    border: 1px solid var(--border-subtle);
    padding: 0.35rem 0.9rem;
    border-radius: 100px;
    margin-bottom: 1.25rem;
}

/* ---- Cards ---- */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 2rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
}

.card--bio::before    { background: linear-gradient(90deg, var(--accent-bio), transparent); }
.card--earth::before  { background: linear-gradient(90deg, var(--accent-earth), transparent); }
.card--anat::before   { background: linear-gradient(90deg, var(--accent-anat), transparent); }
.card--crim::before   { background: linear-gradient(90deg, var(--accent-crim), transparent); }
.card--ocean::before  { background: linear-gradient(90deg, var(--accent-ocean), transparent); }
.card--phys::before   { background: linear-gradient(90deg, var(--accent-phys), transparent); }
.card--env::before    { background: linear-gradient(90deg, var(--accent-env), transparent); }
.card--astro::before  { background: linear-gradient(90deg, var(--accent-astro), transparent); }
.card--chem::before   { background: linear-gradient(90deg, var(--accent-chem), transparent); }

.card-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.card-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.card-title--bio    { color: var(--accent-bio); }
.card-title--earth  { color: var(--accent-earth); }
.card-title--anat   { color: var(--accent-anat); }
.card-title--crim   { color: var(--accent-crim); }
.card-title--ocean  { color: var(--accent-ocean); }
.card-title--phys   { color: var(--accent-phys); }
.card-title--env    { color: var(--accent-env); }
.card-title--astro  { color: var(--accent-astro); }
.card-title--chem   { color: var(--accent-chem); }

.card-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    font-weight: 300;
}

.card-meta {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    margin-top: 1.25rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-dim);
    letter-spacing: 0.05em;
}

.card-meta-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
}

.card-meta-dot--bio    { background: var(--accent-bio); }
.card-meta-dot--earth  { background: var(--accent-earth); }
.card-meta-dot--anat   { background: var(--accent-anat); }
.card-meta-dot--crim   { background: var(--accent-crim); }
.card-meta-dot--ocean  { background: var(--accent-ocean); }
.card-meta-dot--phys   { background: var(--accent-phys); }
.card-meta-dot--env    { background: var(--accent-env); }
.card-meta-dot--astro  { background: var(--accent-astro); }
.card-meta-dot--chem   { background: var(--accent-chem); }

/* ---- Companion links (teacher) ---- */
.companion-dot--bio    { background: var(--accent-bio); }
.companion-dot--earth  { background: var(--accent-earth); }
.companion-dot--anat   { background: var(--accent-anat); }
.companion-dot--crim   { background: var(--accent-crim); }
.companion-dot--ocean  { background: var(--accent-ocean); }
.companion-dot--phys   { background: var(--accent-phys); }
.companion-dot--env    { background: var(--accent-env); }
.companion-dot--astro  { background: var(--accent-astro); }
.companion-dot--chem   { background: var(--accent-chem); }

/* ---- Footer ---- */
.site-footer {
    text-align: center;
    padding: 4rem 0 2rem;
    color: var(--text-dim);
    font-size: 0.85rem;
}

.site-footer .hearts {
    font-size: 1.1rem;
    letter-spacing: 0.3em;
    margin-bottom: 0.5rem;
}

/* ---- Animations ---- */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-16px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes float {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-20px) scale(1.2); }
}

.anim-fade { animation: fadeIn 0.7s ease both; }
.anim-slide { animation: slideUp 0.6s ease both; }

.anim-delay-1 { animation-delay: 0.1s; }
.anim-delay-2 { animation-delay: 0.2s; }
.anim-delay-3 { animation-delay: 0.3s; }
.anim-delay-4 { animation-delay: 0.4s; }
.anim-delay-5 { animation-delay: 0.5s; }
.anim-delay-6 { animation-delay: 0.6s; }

/* ---- Floating molecules ---- */
.molecule {
    position: fixed;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    opacity: 0.25;
    animation: float 8s ease-in-out infinite;
    pointer-events: none;
    z-index: 0;
}

.molecule:nth-child(1) { top: 15%; left: 8%; background: var(--accent-bio); }
.molecule:nth-child(2) { top: 25%; right: 12%; background: var(--accent-env); animation-delay: 2s; }
.molecule:nth-child(3) { top: 60%; left: 5%; background: var(--accent-chem); animation-delay: 4s; }
.molecule:nth-child(4) { top: 70%; right: 8%; background: var(--accent-astro); animation-delay: 1s; }
.molecule:nth-child(5) { top: 45%; left: 15%; background: var(--accent-ocean); animation-delay: 3s; }

/* ---- Mobile ---- */
@media (max-width: 640px) {
    .container { padding: 1rem; }
    .topbar { padding: 1rem; }
    .topbar-nav { gap: 0.75rem; }
    .card-grid { grid-template-columns: 1fr; }
}


/* ---- Additional course card colors ---- */
.card--earth::before { background: linear-gradient(90deg, var(--accent-earth), transparent); }
.card--anat::before { background: linear-gradient(90deg, var(--accent-anat), transparent); }
.card--crim::before { background: linear-gradient(90deg, var(--accent-crim), transparent); }
.card--ocean::before { background: linear-gradient(90deg, var(--accent-ocean), transparent); }
.card--phys::before { background: linear-gradient(90deg, var(--accent-phys), transparent); }
.card--astro::before { background: linear-gradient(90deg, var(--accent-astro), transparent); }

.card-title--earth { color: var(--accent-earth); }
.card-title--anat { color: var(--accent-anat); }
.card-title--crim { color: var(--accent-crim); }
.card-title--ocean { color: var(--accent-ocean); }
.card-title--phys { color: var(--accent-phys); }
.card-title--astro { color: var(--accent-astro); }

.card-meta-dot--earth { background: var(--accent-earth); }
.card-meta-dot--anat { background: var(--accent-anat); }
.card-meta-dot--crim { background: var(--accent-crim); }
.card-meta-dot--ocean { background: var(--accent-ocean); }
.card-meta-dot--phys { background: var(--accent-phys); }
.card-meta-dot--astro { background: var(--accent-astro); }

/* WIP badge */
.wip-badge {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--bg-deep);
    background: var(--accent-warm);
    padding: 0.2rem 0.55rem;
    border-radius: 4px;
    margin-left: 0.5rem;
    vertical-align: middle;
}

/* Teacher companion dots */
.companion-dot--earth { background: var(--accent-earth); }
.companion-dot--anat { background: var(--accent-anat); }
.companion-dot--crim { background: var(--accent-crim); }
.companion-dot--ocean { background: var(--accent-ocean); }
.companion-dot--phys { background: var(--accent-phys); }
.companion-dot--astro { background: var(--accent-astro); }

/* ---- Light Theme Override ---- */
[data-theme="light"] {
    --bg-deep: #fafafa;
    --bg-card: #ffffff;
    --bg-card-hover: #f7fafc;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --text-dim: #a0aec0;
    --border-subtle: #e2e8f0;
    --border-hover: #cbd5e0;
}

[data-theme="light"] .bg-atmosphere::before {
    background-image:
        radial-gradient(circle at 20% 30%, rgba(52, 211, 153, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(96, 165, 250, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(244, 114, 182, 0.04) 0%, transparent 50%);
}

[data-theme="light"] .bg-atmosphere::after {
    background-image:
        linear-gradient(rgba(0,0,0,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,0,0,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

[data-theme="light"] .molecule { opacity: 0.15; }

[data-theme="light"] body {
    background: var(--bg-deep);
    color: var(--text-primary);
}

/* Theme toggle (shared) */
.theme-toggle {
    position: fixed;
    bottom: 1.25rem;
    right: 1.25rem;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border-subtle);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 1.1rem;
    cursor: pointer;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(0,0,0,0.25);
}

/* ---- Accessibility Panel ---- */
.a11y-btn {
    width: 34px; height: 34px; border-radius: 50%;
    border: 1px solid var(--border-subtle); background: var(--bg-card);
    font-size: 0.95rem; display: flex; align-items: center; justify-content: center;
    transition: all 0.15s; flex-shrink: 0; cursor: pointer;
}
.a11y-btn:hover { transform: scale(1.1); }
.a11y-panel {
    display: none; position: fixed; top: 56px; right: 0.75rem;
    width: 260px; background: var(--bg-card); border: 1px solid var(--border-subtle);
    border-radius: 10px; padding: 1rem; z-index: 60;
    box-shadow: 0 12px 32px rgba(0,0,0,0.4); font-family: 'DM Sans', sans-serif;
}
.a11y-panel.open { display: block; }
.a11y-panel h3 {
    font-size: 0.8rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 0.08em; color: var(--text-dim); margin-bottom: 0.75rem;
}
.a11y-row {
    display: flex; align-items: center; justify-content: space-between;
    padding: 0.5rem 0; border-bottom: 1px solid var(--border-subtle);
}
.a11y-row:last-child { border-bottom: none; }
.a11y-label { font-size: 0.85rem; font-weight: 500; }
.a11y-toggle {
    width: 40px; height: 22px; border-radius: 11px; border: none;
    background: var(--border-subtle); position: relative; cursor: pointer;
    transition: background 0.2s;
}
.a11y-toggle::after {
    content: ""; position: absolute; top: 2px; left: 2px;
    width: 18px; height: 18px; border-radius: 50%;
    background: var(--text-primary); transition: transform 0.2s;
}
.a11y-toggle.on { background: var(--accent-bio, #34d399); }
.a11y-toggle.on::after { transform: translateX(18px); }
.a11y-size-btns { display: flex; gap: 0.3rem; }
.a11y-size-btn {
    padding: 0.25rem 0.55rem; border-radius: 4px; font-weight: 600;
    border: 1px solid var(--border-subtle); background: var(--bg-deep);
    color: var(--text-secondary); cursor: pointer; transition: all 0.15s;
}
.a11y-size-btn.active { background: rgba(52,211,153,0.12); color: var(--accent-bio, #34d399); border-color: var(--accent-bio, #34d399); }

/* Dyslexic font */
[data-dyslexic="true"] body, [data-dyslexic="true"] input, [data-dyslexic="true"] button {
    font-family: "OpenDyslexic", "DM Sans", sans-serif !important;
}
[data-dyslexic="true"] h1, [data-dyslexic="true"] h2, [data-dyslexic="true"] .topbar-brand,
[data-dyslexic="true"] .heading-display {
    font-family: "OpenDyslexic", "Source Serif 4", serif !important;
}

/* Text sizes */
[data-textsize="small"] body { font-size: 14px; }
[data-textsize="medium"] body { font-size: 16px; }
[data-textsize="large"] body { font-size: 19px; }

/* Extra spacing */
[data-spacing="true"] body { line-height: 1.9; letter-spacing: 0.03em; word-spacing: 0.12em; }

/* Reduced motion */
[data-motion="reduced"] *, [data-motion="reduced"] *::before, [data-motion="reduced"] *::after {
    animation: none !important; transition: none !important;
}

/* Colorblind */
[data-colorblind="true"] .card::before { height: 6px; }

/* ---- Skip Link (accessibility) ---- */
.skip-link {
    position: absolute;
    top: -100px;
    left: 1rem;
    padding: 0.75rem 1.5rem;
    background: var(--accent, #818cf8);
    color: white;
    border-radius: 0 0 8px 8px;
    font-weight: 600;
    font-size: 0.9rem;
    z-index: 99999;
    transition: top 0.2s;
    text-decoration: none;
}
.skip-link:focus {
    top: 0;
}

/* ---- Glossary definitions ---- */
dfn[data-def] {
    border-bottom: 1.5px dotted var(--text-dim);
    cursor: help;
    position: relative;
    font-style: normal;
}
dfn[data-def]:hover::after,
dfn[data-def]:focus::after {
    content: attr(data-def);
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-card);
    border: 1.5px solid var(--border-hover);
    border-radius: 8px;
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
    line-height: 1.5;
    color: var(--text-primary);
    box-shadow: 0 4px 12px rgba(0,0,0,0.25);
    width: max-content;
    max-width: 260px;
    z-index: 100;
    pointer-events: none;
    white-space: normal;
}
dfn[data-def]:focus { outline: 2px solid var(--accent-bio); outline-offset: 2px; border-radius: 2px; }