/* base.css -- foundational styles every page needs
   includes: reset, css variables, dark mode, typography, container,
   sticky header, tab navigation, disclaimer, icons, narrative sections,
   cards, badges, card grids, callout boxes, learn-more expandable,
   buttons, filter bar, peptide card, spectrum/stats, timeline,
   modal, footer (learn page), svg container, entrance animations,
   touch enhancements, scrollbar, comparison slots, tier list,
   scale container, body diagram container, calculator layout,
   btn-reset, landing hero (styles.css version), landing stats,
   landing sections, learning path, course grid (styles.css version),
   pricing grid (styles.css version), faq, landing footer ref,
   course page styles, explorer credits badge, cert cta, community card,
   gated loading skeleton */

/* ============================================== */
/* Reset and base */
/* ============================================== */

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

:root {
    --color-bg: #fafafa;
    --color-surface: #ffffff;
    --color-text: #1a1a1a;
    --color-text-muted: #666666;
    --color-border: #e0e0e0;
    --color-primary: #34d399;
    --color-primary-hover: #10b981;
    --color-disabled: #9ca3af;
    --color-disabled-bg: #f3f4f6;
    --color-success: #10b981;
    --color-warning: #f97316;
    --color-danger: #ef4444;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', Consolas, monospace;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --radius-lg: 12px;
    --transition: 150ms ease;

    /* spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* glass and animation */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-blur: blur(12px) saturate(180%);
    --color-bg-alt: #f0f2f5;
    --color-bg-card: rgba(0, 0, 0, 0.03);
    --color-text-secondary: #444444;
    --color-muted: #666666;
    --color-amber: #d97706;
    --color-accent-glow: rgba(52, 211, 153, 0.15);
    --transition-smooth: 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
    --transition-slow: 0.6s cubic-bezier(0.25, 0.1, 0.25, 1);
    --section-bg-odd: rgba(52, 211, 153, 0.02);

    /* amino acid property colors */
    --aa-hydrophobic: #d97706;
    --aa-polar: #2563eb;
    --aa-positive: #dc2626;
    --aa-negative: #7c3aed;
    --aa-special: #059669;

    /* evidence tier colors */
    --tier-approved: #10b981;
    --tier-human-data: #eab308;
    --tier-animal: #f97316;
    --tier-anecdotal: #ef4444;

    /* tab */
    --header-height: auto;
}

/* ============================================== */
/* Dark mode */
/* ============================================== */

html.dark {
    --color-bg: #111114;
    --color-surface: #1c1c20;
    --color-text: #e8e8ec;
    --color-text-muted: #9898a0;
    --color-border: #333338;
    --color-primary: #34d399;
    --color-primary-hover: #10b981;
    --color-disabled: #6b7280;
    --color-disabled-bg: #232328;
    --color-success: #34d399;
    --color-warning: #fbbf24;
    --color-danger: #f87171;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.6);
    --glass-bg: rgba(255, 255, 255, 0.06);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-blur: blur(12px) saturate(150%);
    --color-bg-alt: #18181c;
    --color-bg-card: rgba(255, 255, 255, 0.05);
    --color-text-secondary: rgba(255, 255, 255, 0.8);
    --color-muted: rgba(255, 255, 255, 0.5);
    --color-amber: #f59e0b;
    --color-accent-glow: rgba(52, 211, 153, 0.25);
    --section-bg-odd: rgba(52, 211, 153, 0.04);

    --aa-hydrophobic: #fbbf24;
    --aa-polar: #60a5fa;
    --aa-positive: #f87171;
    --aa-negative: #a78bfa;
    --aa-special: #34d399;

    --tier-approved: #34d399;
    --tier-human-data: #fbbf24;
    --tier-animal: #fb923c;
    --tier-anecdotal: #f87171;
}

html.dark body {
    background-image:
        radial-gradient(ellipse at 20% 0%, rgba(52, 211, 153, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 100%, rgba(52, 211, 153, 0.05) 0%, transparent 50%);
}

html.dark .sticky-header {
    background: rgba(17, 17, 20, 0.82);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow:
        0 1px 3px rgba(0, 0, 0, 0.4),
        inset 0 -1px 0 rgba(255, 255, 255, 0.04);
}

html.dark .card {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

html.dark .card:hover {
    background: rgba(255, 255, 255, 0.09);
    box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

html.dark .callout-box {
    background: rgba(52, 211, 153, 0.1);
    border-color: rgba(52, 211, 153, 0.2);
}

html.dark .callout-content {
    color: #c7d2fe;
}

html.dark .callout-box.callout-warning {
    background: rgba(251, 191, 36, 0.1);
    border-color: rgba(251, 191, 36, 0.25);
}

html.dark .callout-box.callout-warning .callout-content {
    color: #fcd34d;
}

html.dark .callout-box.callout-warning .callout-icon {
    color: #fbbf24;
}

html.dark .callout-box.callout-danger {
    background: rgba(248, 113, 113, 0.1);
    border-color: rgba(248, 113, 113, 0.2);
}

html.dark .callout-box.callout-danger .callout-content {
    color: #fca5a5;
}

html.dark .callout-box.callout-danger .callout-icon {
    color: #f87171;
}

html.dark .modal {
    background: rgba(0, 0, 0, 0.75);
}

html.dark .modal-content {
    background: rgba(28, 28, 32, 0.95);
    border-color: rgba(255, 255, 255, 0.1);
}

html.dark .disclaimer-banner {
    background: rgba(248, 113, 113, 0.08);
    border-color: rgba(248, 113, 113, 0.2);
}

html.dark .tab-btn.active {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

html.dark .interactive-area {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.08);
}

html.dark .badge {
    background: rgba(255, 255, 255, 0.08);
}

html.dark .learn-more-content {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.08);
}

/* ============================================== */
/* Base typography and body */
/* ============================================== */

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
    scroll-padding-top: 88px;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    background-image:
        radial-gradient(ellipse at 20% 0%, rgba(52, 211, 153, 0.04) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 100%, rgba(16, 185, 129, 0.03) 0%, transparent 50%);
    background-attachment: fixed;
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ============================================== */
/* Container */
/* ============================================== */

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: var(--spacing-sm);
    padding-top: var(--spacing-md);
}

@media (min-width: 768px) {
    .container {
        padding: var(--spacing-lg) var(--spacing-md);
    }
}

/* ============================================== */
/* Sticky header with tab navigation */
/* ============================================== */

.sticky-header {
    position: sticky;
    top: 0;
    z-index: var(--z-nav);
    background: rgba(255, 255, 255, 0.78);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    box-shadow:
        0 1px 3px rgba(0, 0, 0, 0.04),
        inset 0 -1px 0 rgba(255, 255, 255, 0.5);
    padding: var(--spacing-xs) var(--spacing-sm);
    transition: box-shadow var(--transition-smooth), background var(--transition-smooth);
}

.sticky-header-content {
    max-width: 1100px;
    margin: 0 auto;
    text-align: center;
    position: relative;
}

.sticky-header h1 {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.15rem;
    color: var(--color-text);
}

.sticky-header .subtitle {
    color: var(--color-text-muted);
    font-size: 0.75rem;
    line-height: 1.4;
    margin: 0 0 0.5rem 0;
}

@media (min-width: 768px) {
    .sticky-header {
        padding: var(--spacing-xs) var(--spacing-md);
    }

    .sticky-header h1 {
        font-size: 1.35rem;
        margin-bottom: 0.2rem;
    }

    .sticky-header .subtitle {
        font-size: 0.85rem;
        margin-bottom: 0.6rem;
    }
}

/* theme toggle */
.academy-header-actions .theme-toggle {
    position: absolute;
    right: 0;
    top: 0.25rem;
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    background: var(--color-surface);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--transition-smooth);
    -webkit-tap-highlight-color: transparent;
}

.academy-header-actions .theme-toggle:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.academy-header-actions .theme-toggle [data-lucide] {
    width: 16px;
    height: 16px;
}

.academy-header-actions .theme-toggle .icon-moon { display: block; }
.academy-header-actions .theme-toggle .icon-sun { display: none; }
html.dark .academy-header-actions .theme-toggle .icon-moon { display: none; }
html.dark .academy-header-actions .theme-toggle .icon-sun { display: block; }

/* ============================================== */
/* Tab navigation */
/* ============================================== */

.tab-nav {
    display: flex;
    gap: 0.25rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: 0 2rem;
    justify-content: center;
}

.tab-nav::-webkit-scrollbar {
    display: none;
}

.tab-btn {
    flex-shrink: 0;
    padding: 0.4rem 0.75rem;
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--color-text-muted);
    background: transparent;
    border: 1px solid transparent;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-smooth);
    white-space: nowrap;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    font-family: var(--font-sans);
    letter-spacing: -0.01em;
}

.tab-btn:hover {
    color: var(--color-text);
    background: var(--color-disabled-bg);
}

.tab-btn.active {
    color: #fff;
    background: var(--color-primary);
    border-color: var(--color-primary);
    box-shadow: 0 1px 3px rgba(52, 211, 153, 0.3);
}

@media (min-width: 768px) {
    .tab-nav {
        gap: 0.35rem;
    }

    .tab-btn {
        padding: 0.45rem 1rem;
        font-size: 0.8rem;
    }
}

/* ============================================== */
/* Tab content */
/* ============================================== */

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ============================================== */
/* Medical disclaimer banner */
/* ============================================== */

.disclaimer-banner {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: var(--radius);
    padding: 0.6rem 0.75rem;
    margin-bottom: var(--spacing-md);
    font-size: 0.78rem;
    line-height: 1.5;
    color: #991b1b;
}

.disclaimer-banner .disclaimer-icon {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
    margin-top: 1px;
}

.disclaimer-banner a {
    color: inherit;
    text-decoration: underline;
}

@media (min-width: 768px) {
    .disclaimer-banner {
        padding: 0.75rem 1rem;
        font-size: 0.82rem;
        gap: 0.75rem;
    }

    .disclaimer-banner .disclaimer-icon {
        width: 18px;
        height: 18px;
    }
}

/* ============================================== */
/* Lucide icons */
/* ============================================== */

[data-lucide] {
    width: 24px;
    height: 24px;
    stroke-width: 2;
}

/* ============================================== */
/* Narrative sections */
/* ============================================== */

.narrative-section {
    margin-bottom: var(--spacing-lg);
}

.section-intro {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}


@media (min-width: 768px) {
    .section-title {
        font-size: 1.75rem;
        margin-bottom: 0.75rem;
    }
}

.section-description {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.6;
}

@media (min-width: 768px) {
    .section-description {
        font-size: 1rem;
        line-height: 1.7;
    }
}

.section-description strong {
    color: var(--color-text);
}

/* section divider */
.section-divider {
    border: none;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--color-border) 20%, var(--color-border) 80%, transparent);
    margin: var(--spacing-lg) auto;
    max-width: 150px;
}

@media (min-width: 768px) {
    .section-divider {
        margin: var(--spacing-xl) auto;
        max-width: 200px;
    }
}

/* ============================================== */
/* Card - glassmorphic container */
/* ============================================== */

.card {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(8px) saturate(150%);
    -webkit-backdrop-filter: blur(8px) saturate(150%);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius);
    padding: var(--spacing-sm);
    box-shadow:
        var(--shadow-sm),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
    transition: box-shadow var(--transition-smooth), transform var(--transition-smooth);
}

@media (min-width: 768px) {
    .card {
        padding: var(--spacing-md);
    }
}

.card:hover {
    box-shadow:
        var(--shadow-md),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
    transform: translateY(-2px);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

@media (min-width: 768px) {
    .card-header {
        margin-bottom: 1rem;
    }
}

.card-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

@media (min-width: 768px) {
    .card-header h3 {
        font-size: 1.125rem;
    }
}

/* ============================================== */
/* Badges */
/* ============================================== */

.badge {
    display: inline-block;
    font-size: 0.65rem;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    background: var(--color-disabled-bg);
    color: var(--color-text-muted);
    font-weight: 500;
    line-height: 1.4;
}

@media (min-width: 768px) {
    .badge {
        font-size: 0.72rem;
        padding: 0.2rem 0.5rem;
    }
}

.badge-approved {
    background: rgba(16, 185, 129, 0.12);
    color: var(--tier-approved);
}

.badge-research {
    background: rgba(234, 179, 8, 0.12);
    color: var(--tier-human-data);
}

.badge-animal {
    background: rgba(249, 115, 22, 0.12);
    color: var(--tier-animal);
}

.badge-anecdotal {
    background: rgba(239, 68, 68, 0.12);
    color: var(--tier-anecdotal);
}

.badge-category {
    background: rgba(52, 211, 153, 0.1);
    color: var(--color-primary);
}

/* ============================================== */
/* Card grids */
/* ============================================== */

.card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
}

@media (min-width: 600px) {
    .card-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
}

@media (min-width: 900px) {
    .card-grid.grid-3 {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ============================================== */
/* Callout boxes */
/* ============================================== */

.callout-box {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    background: #eef2ff;
    border: 1px solid #c7d2fe;
    border-radius: var(--radius);
    padding: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

@media (min-width: 768px) {
    .callout-box {
        gap: 1rem;
        padding: 1.25rem;
    }
}

.callout-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    color: var(--color-primary);
}

@media (min-width: 768px) {
    .callout-icon {
        width: 24px;
        height: 24px;
    }
}

.callout-icon [data-lucide] {
    width: 100%;
    height: 100%;
}

.callout-content {
    font-size: 0.875rem;
    line-height: 1.5;
    color: #3730a3;
}

@media (min-width: 768px) {
    .callout-content {
        font-size: 0.95rem;
        line-height: 1.6;
    }
}

.callout-box.callout-warning {
    background: #fef3c7;
    border-color: #fcd34d;
}

.callout-box.callout-warning .callout-icon {
    color: #d97706;
}

.callout-box.callout-warning .callout-content {
    color: #92400e;
}

.callout-box.callout-danger {
    background: #fef2f2;
    border-color: #fecaca;
}

.callout-box.callout-danger .callout-icon {
    color: #dc2626;
}

.callout-box.callout-danger .callout-content {
    color: #991b1b;
}

/* ============================================== */
/* Learn more expandable */
/* ============================================== */

.learn-more-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-primary);
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.25rem 0;
    transition: color var(--transition);
    font-family: var(--font-sans);
}

.learn-more-toggle:hover {
    color: var(--color-primary-hover);
}

.learn-more-toggle [data-lucide] {
    width: 14px;
    height: 14px;
    transition: transform var(--transition-smooth);
}

.learn-more-toggle.expanded [data-lucide] {
    transform: rotate(180deg);
}

.learn-more-content {
    display: none;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--spacing-sm);
    margin-top: 0.5rem;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--color-text-muted);
}

.learn-more-content.expanded {
    display: block;
}

/* ============================================== */
/* Buttons */
/* ============================================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.6rem 1rem;
    font-size: 0.85rem;
    font-weight: 500;
    font-family: var(--font-sans);
    color: var(--color-text);
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition-smooth);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.btn:hover,
.btn:active {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgba(52, 211, 153, 0.05);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.btn [data-lucide] {
    width: 16px;
    height: 16px;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.btn-primary:hover,
.btn-primary:active {
    background: var(--color-primary-hover);
    color: #fff;
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.btn-sm {
    padding: 0.35rem 0.65rem;
    font-size: 0.78rem;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
}

/* ============================================== */
/* Button reset utility */
/* ============================================== */

.btn-reset {
    background: none;
    border: none;
    padding: 0;
    margin: 0;
    font: inherit;
    color: inherit;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

/* ============================================== */
/* Filter bar for catalog */
/* ============================================== */

.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-bottom: var(--spacing-md);
    justify-content: center;
}

.filter-btn {
    padding: 0.3rem 0.65rem;
    font-size: 0.72rem;
    font-weight: 500;
    font-family: var(--font-sans);
    color: var(--color-text-muted);
    background: var(--color-disabled-bg);
    border: 1px solid transparent;
    border-radius: 20px;
    cursor: pointer;
    transition: all var(--transition);
    -webkit-tap-highlight-color: transparent;
}

.filter-btn:hover {
    color: var(--color-text);
    background: var(--color-border);
}

.filter-btn.active {
    color: #fff;
    background: var(--color-primary);
    border-color: var(--color-primary);
}

@media (min-width: 768px) {
    .filter-btn {
        padding: 0.35rem 0.85rem;
        font-size: 0.78rem;
    }
}

/* ============================================== */
/* Peptide catalog card */
/* ============================================== */

.peptide-card {
    cursor: pointer;
}

.peptide-card .card-header {
    margin-bottom: 0.5rem;
}

.peptide-card .peptide-name {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.15rem;
}

.peptide-card .peptide-alias {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    font-style: italic;
}

.peptide-card .peptide-summary {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    margin-bottom: 0.75rem;
}

.peptide-card .peptide-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
}

@media (min-width: 768px) {
    .peptide-card .peptide-name {
        font-size: 1.05rem;
    }

    .peptide-card .peptide-summary {
        font-size: 0.875rem;
    }
}

/* ============================================== */
/* Spectrum / slider visualization */
/* ============================================== */

.spectrum-bar {
    height: 6px;
    border-radius: 3px;
    background: linear-gradient(to right, var(--color-primary), var(--color-success), var(--color-warning));
    position: relative;
    margin: var(--spacing-md) 0;
}

.spectrum-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.72rem;
    color: var(--color-text-muted);
    margin-top: 0.35rem;
}

/* ============================================== */
/* Stats / metrics */
/* ============================================== */

.stat-block {
    text-align: center;
    padding: var(--spacing-sm);
}

.stat-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    display: block;
    font-family: var(--font-mono);
}

@media (min-width: 768px) {
    .stat-number {
        font-size: 2rem;
    }
}

.stat-label {
    font-size: 0.72rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ============================================== */
/* Timeline */
/* ============================================== */

.timeline-section {
    margin: 0;
    padding: 0;
}

.timeline-container {
    position: relative;
    width: 100%;
    height: 220px;
    margin: 0 auto;
    padding: 0 0.5rem;
    overflow-x: auto;
    overflow-y: visible;
    -webkit-overflow-scrolling: touch;
}

@media (min-width: 900px) {
    .timeline-container {
        height: 200px;
        padding: 0 1rem;
        overflow-x: visible;
    }
}

.timeline-path {
    position: absolute;
    top: 50%;
    left: 0;
    width: 1200px;
    height: 120px;
    transform: translateY(-50%);
    pointer-events: none;
    overflow: visible;
}

@media (min-width: 900px) {
    .timeline-path {
        width: 100%;
    }
}

.timeline-wave {
    fill: none;
    stroke: url(#timeline-gradient);
    stroke-width: 3;
    stroke-linecap: round;
    stroke-dasharray: 8 4;
    filter: drop-shadow(0 0 4px rgba(52, 211, 153, 0.15));
}

.timeline-points {
    position: absolute;
    top: 0;
    left: 0;
    width: 1200px;
    height: 100%;
}

@media (min-width: 900px) {
    .timeline-points {
        width: 100%;
    }
}

.timeline-point {
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    z-index: var(--z-content);
    -webkit-tap-highlight-color: transparent;
    text-decoration: none;
    color: inherit;
}

.timeline-point[data-wave="up"] { transform: translate(-50%, calc(-50% - 25px)); }
.timeline-point[data-wave="down"] { transform: translate(-50%, calc(-50% + 25px)); }

.point-icon {
    width: 40px;
    height: 40px;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-smooth);
    color: var(--color-text-muted);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.point-icon [data-lucide] {
    width: 20px;
    height: 20px;
}

@media (min-width: 768px) {
    .point-icon {
        width: 44px;
        height: 44px;
    }
}

.timeline-point:hover .point-icon,
.timeline-point:active .point-icon {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
    transform: scale(1.15);
    box-shadow:
        0 4px 12px rgba(52, 211, 153, 0.3),
        0 0 0 4px rgba(52, 211, 153, 0.1);
}

.point-year {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--color-text-muted);
    margin-top: 0.4rem;
    transition: color 0.3s ease;
}

@media (min-width: 768px) {
    .point-year {
        font-size: 0.7rem;
        margin-top: 0.5rem;
    }
}

.timeline-point:hover .point-year {
    color: var(--color-primary);
}

.point-tooltip {
    position: absolute;
    bottom: calc(100% + 12px);
    left: 50%;
    transform: translateX(-50%) scale(0.9);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px) saturate(150%);
    -webkit-backdrop-filter: blur(12px) saturate(150%);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius);
    padding: 0.75rem;
    width: 200px;
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.12),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
    z-index: var(--z-dropdown);
}

@media (min-width: 768px) {
    .point-tooltip {
        bottom: calc(100% + 15px);
        padding: 1rem;
        width: 240px;
    }
}

.point-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 8px solid transparent;
    border-top-color: var(--color-surface);
}

.point-tooltip.tooltip-left {
    left: auto;
    right: 0;
    transform: translateX(0) scale(0.9);
}

.point-tooltip.tooltip-left::after {
    left: auto;
    right: 15px;
}

.timeline-point:hover .point-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) scale(1);
}

.timeline-point:hover .point-tooltip.tooltip-left {
    transform: translateX(0) scale(1);
}

.point-tooltip h4 {
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 0.3rem;
    color: var(--color-text);
}

.point-tooltip p {
    font-size: 0.72rem;
    color: var(--color-text-muted);
    line-height: 1.4;
    margin: 0;
}

@media (min-width: 768px) {
    .point-tooltip h4 {
        font-size: 0.875rem;
    }

    .point-tooltip p {
        font-size: 0.78rem;
        line-height: 1.5;
    }
}

html.dark .point-tooltip {
    background: rgba(28, 28, 32, 0.95);
    border-color: rgba(255, 255, 255, 0.12);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

html.dark .point-tooltip::after {
    border-top-color: rgba(28, 28, 32, 0.95);
}

/* ============================================== */
/* Modal */
/* ============================================== */

.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: var(--z-modal);
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    box-shadow:
        0 24px 80px rgba(0, 0, 0, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

@media (min-width: 768px) {
    .modal-content {
        padding: 2rem;
    }
}

.modal-close {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--color-text-muted);
    cursor: pointer;
    border-radius: 4px;
    transition: background var(--transition);
    -webkit-tap-highlight-color: transparent;
}

.modal-close:hover {
    background: var(--color-disabled-bg);
}

.modal-close [data-lucide] {
    width: 20px;
    height: 20px;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    padding-right: 2.5rem;
}

@media (min-width: 768px) {
    .modal-title {
        font-size: 1.5rem;
        margin-bottom: 1.5rem;
    }
}

/* ============================================== */
/* Footer (learn page version) */
/* ============================================== */

.footer {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 0.8rem;
    margin-top: var(--spacing-lg);
}

@media (min-width: 768px) {
    .footer {
        font-size: 0.875rem;
        margin-top: 2rem;
    }
}

.footer-credit {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    margin-top: 0.75rem;
    flex-wrap: wrap;
}

.footer-credit a {
    display: inline-flex;
    align-items: center;
}


.footer-sources {
    margin-top: 0.5rem;
    font-size: 0.72rem;
}

.footer-sources a {
    color: var(--color-primary);
    text-decoration: none;
}

.footer-sources a:hover {
    text-decoration: underline;
}

/* ============================================== */
/* SVG containers */
/* ============================================== */

.svg-container {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.svg-container svg {
    max-width: 100%;
    height: auto;
}

/* ============================================== */
/* Entrance animations */
/* ============================================== */

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

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity var(--transition-slow),
                transform var(--transition-slow);
}

.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* stagger children within grids */
.animate-on-scroll.is-visible .card {
    animation: fadeInScale 0.5s cubic-bezier(0.25, 0.1, 0.25, 1) both;
}

.animate-on-scroll.is-visible .card:nth-child(1) { animation-delay: 0ms; }
.animate-on-scroll.is-visible .card:nth-child(2) { animation-delay: 80ms; }
.animate-on-scroll.is-visible .card:nth-child(3) { animation-delay: 160ms; }
.animate-on-scroll.is-visible .card:nth-child(4) { animation-delay: 240ms; }
.animate-on-scroll.is-visible .card:nth-child(5) { animation-delay: 320ms; }
.animate-on-scroll.is-visible .card:nth-child(6) { animation-delay: 400ms; }

/* respect reduced motion */
@media (prefers-reduced-motion: reduce) {
    .animate-on-scroll {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .animate-on-scroll.is-visible .card {
        animation: none;
    }
}

/* noscript fallback */
.no-js .animate-on-scroll {
    opacity: 1;
    transform: none;
}

/* ============================================== */
/* Touch-friendly enhancements */
/* ============================================== */

@media (hover: none) and (pointer: coarse) {
    .btn {
        min-height: 48px;
    }

    .point-icon {
        width: 48px;
        height: 48px;
    }

    .timeline-point:active .point-tooltip {
        opacity: 1;
        visibility: visible;
        transform: translateX(-50%) scale(1);
    }

    .timeline-point:active .point-tooltip.tooltip-left {
        transform: translateX(0) scale(1);
    }
}

/* ============================================== */
/* Scrollbar styling */
/* ============================================== */

::-webkit-scrollbar {
    width: 8px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

.timeline-container::-webkit-scrollbar {
    height: 6px;
}

.timeline-container::-webkit-scrollbar-track {
    background: var(--color-disabled-bg);
    border-radius: 3px;
}

.timeline-container::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

/* ============================================== */
/* Comparison tool placeholder */
/* ============================================== */

.comparison-slots {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
}

.comparison-slot {
    width: 180px;
    min-height: 200px;
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    font-size: 0.85rem;
    text-align: center;
    padding: var(--spacing-sm);
    transition: all var(--transition-smooth);
    cursor: pointer;
}

.comparison-slot:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgba(52, 211, 153, 0.03);
}

.comparison-slot.filled {
    border-style: solid;
    border-color: var(--color-primary);
    background: rgba(52, 211, 153, 0.05);
}

@media (min-width: 768px) {
    .comparison-slot {
        width: 220px;
        min-height: 250px;
    }
}

/* ============================================== */
/* Evidence tier visualization */
/* ============================================== */

.tier-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.tier-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--radius);
    background: var(--color-surface);
    border-left: 4px solid transparent;
}

.tier-item.tier-1 { border-left-color: var(--tier-approved); }
.tier-item.tier-2 { border-left-color: var(--tier-human-data); }
.tier-item.tier-3 { border-left-color: var(--tier-animal); }
.tier-item.tier-4 { border-left-color: var(--tier-anecdotal); }

.tier-label {
    flex-shrink: 0;
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    min-width: 65px;
    text-align: center;
}

.tier-1 .tier-label {
    background: rgba(16, 185, 129, 0.12);
    color: var(--tier-approved);
}

.tier-2 .tier-label {
    background: rgba(234, 179, 8, 0.12);
    color: var(--tier-human-data);
}

.tier-3 .tier-label {
    background: rgba(249, 115, 22, 0.12);
    color: var(--tier-animal);
}

.tier-4 .tier-label {
    background: rgba(239, 68, 68, 0.12);
    color: var(--tier-anecdotal);
}

.tier-description {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

.tier-description strong {
    color: var(--color-text);
}

/* ============================================== */
/* Balance scale placeholder */
/* ============================================== */

.scale-container {
    display: flex;
    justify-content: center;
    align-items: flex-end;
    gap: var(--spacing-md);
    min-height: 250px;
    padding: var(--spacing-md) 0;
}

.scale-pan {
    width: 45%;
    max-width: 300px;
    min-height: 200px;
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.scale-pan.benefits {
    background: rgba(16, 185, 129, 0.05);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.scale-pan.risks {
    background: rgba(239, 68, 68, 0.05);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.scale-pan h4 {
    font-size: 0.85rem;
    font-weight: 600;
    text-align: center;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

.scale-card {
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-size: 0.78rem;
    line-height: 1.4;
    cursor: grab;
    transition: all var(--transition);
}

.scale-card:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.benefits .scale-card {
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.15);
}

.risks .scale-card {
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.15);
}

/* ============================================== */
/* Body diagram placeholder */
/* ============================================== */

.body-diagram-container {
    display: flex;
    justify-content: center;
    position: relative;
    min-height: 400px;
    padding: var(--spacing-md) 0;
}

@media (min-width: 768px) {
    .body-diagram-container {
        min-height: 500px;
    }
}

/* ============================================== */
/* Reconstitution calculator placeholder */
/* ============================================== */

.calculator-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

@media (min-width: 700px) {
    .calculator-layout {
        grid-template-columns: 1fr 1fr;
    }
}

.calculator-inputs label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 0.35rem;
    color: var(--color-text);
}

.calculator-inputs input,
.calculator-inputs select {
    width: 100%;
    padding: 0.6rem 0.75rem;
    font-size: 0.9rem;
    font-family: var(--font-mono);
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    color: var(--color-text);
    transition: border-color var(--transition-smooth), box-shadow var(--transition-smooth);
    margin-bottom: var(--spacing-sm);
}

.calculator-inputs input:focus,
.calculator-inputs select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.calculator-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ============================================== */
/* Landing hero (styles.css version) */
/* ============================================== */

.landing-hero {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.landing-hero-inner {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.85rem;
    background: rgba(52, 211, 153, 0.06);
    border: 1px solid rgba(52, 211, 153, 0.15);
    border-radius: 20px;
    font-size: 0.82rem;
    color: var(--color-primary);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.landing-hero-title {
    font-size: 2.25rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.15;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

@media (min-width: 768px) {
    .landing-hero-title {
        font-size: 3.25rem;
    }
}

.landing-hero-subtitle {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
    max-width: 550px;
    margin-left: auto;
    margin-right: auto;
}

@media (min-width: 768px) {
    .landing-hero-subtitle {
        font-size: 1.15rem;
    }
}

.landing-hero-ctas {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* ============================================== */
/* Landing stats bar */
/* ============================================== */

.landing-stats {
    padding: var(--spacing-md) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    text-align: center;
}

@media (min-width: 600px) {
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.stat-item {
    padding: var(--spacing-xs);
}

.stat-item .stat-number {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--color-primary);
    font-family: var(--font-mono);
    line-height: 1.2;
}

.stat-item .stat-label {
    font-size: 0.72rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.15rem;
    display: block;
}

/* ============================================== */
/* Landing sections */
/* ============================================== */

.landing-section {
    padding: var(--spacing-xl) 0;
}

.landing-section-alt {
    background: var(--section-bg-odd);
}

/* ============================================== */
/* Learning path cards */
/* ============================================== */

.learning-path {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-width: 700px;
    margin: 0 auto;
}

.path-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--color-text);
    transition: all var(--transition-smooth);
    position: relative;
}

.path-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md), 0 0 0 3px var(--color-accent-glow);
    transform: translateY(-2px);
}

html.dark .path-card {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.08);
}

html.dark .path-card:hover {
    background: rgba(255, 255, 255, 0.07);
}

.path-card-number {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-primary);
    background: rgba(52, 211, 153, 0.08);
    border-radius: 50%;
    flex-shrink: 0;
    font-family: var(--font-mono);
}

.path-card-content {
    flex: 1;
    min-width: 0;
}

.path-card-content h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.2rem;
}

.path-card-content p {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    line-height: 1.4;
    margin-bottom: 0.35rem;
}

.path-card-features {
    display: flex;
    gap: 0.75rem;
    font-size: 0.7rem;
    color: var(--color-text-muted);
}

.path-card-features span {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.path-card-badge {
    flex-shrink: 0;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
}

.badge-free {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
}

/* ============================================== */
/* Course grid (styles.css version / landing page) */
/* ============================================== */

.course-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
}

@media (min-width: 600px) {
    .course-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 900px) {
    .course-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.course-card {
    display: flex;
    flex-direction: column;
    padding: var(--spacing-sm);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--color-text);
    transition: all var(--transition-smooth);
}

.course-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

html.dark .course-card {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.08);
}

html.dark .course-card:hover {
    background: rgba(255, 255, 255, 0.07);
}

.course-card-header {
    display: flex;
    gap: 0.35rem;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
}

.course-card-name {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.15rem;
}

.course-card-aliases {
    font-size: 0.72rem;
    color: var(--color-text-muted);
    font-style: italic;
    margin-bottom: 0.35rem;
}

.course-card-summary {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    flex: 1;
    margin-bottom: 0.75rem;
}

.course-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 0.5rem;
    border-top: 1px solid var(--color-border);
}

.course-card-price {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-primary);
    font-family: var(--font-mono);
}

.course-card-preview {
    font-size: 0.7rem;
    color: var(--color-text-muted);
}

/* ============================================== */
/* Pricing grid (styles.css version) */
/* ============================================== */

.pricing-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    max-width: 900px;
    margin: 0 auto;
}

@media (min-width: 700px) {
    .pricing-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.pricing-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    position: relative;
    transition: all var(--transition-smooth);
}

.pricing-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

html.dark .pricing-card {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.08);
}

.pricing-card-featured {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 1px var(--color-primary), var(--shadow-md);
}

html.dark .pricing-card-featured {
    border-color: var(--color-primary);
}

.pricing-card-badge {
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: white;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.2rem 0.75rem;
    border-radius: 20px;
    white-space: nowrap;
}

.pricing-card-header {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.pricing-card-header h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.pricing-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.35rem;
}

.pricing-amount {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-text);
    font-family: var(--font-mono);
}

.pricing-period {
    font-size: 0.82rem;
    color: var(--color-text-muted);
}

.pricing-savings {
    font-size: 0.75rem;
    color: var(--color-success);
    font-weight: 500;
    margin-top: 0.25rem;
}

.pricing-features {
    list-style: none;
    flex: 1;
    margin-bottom: var(--spacing-md);
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.pricing-features li [data-lucide] {
    color: var(--color-success);
    flex-shrink: 0;
}

.pricing-cta {
    width: 100%;
    justify-content: center;
}

/* ============================================== */
/* FAQ */
/* ============================================== */

.faq-list {
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.faq-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: border-color var(--transition);
}

html.dark .faq-item {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.08);
}

.faq-item.open {
    border-color: var(--color-primary);
}

.faq-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.85rem var(--spacing-sm);
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    text-align: left;
    -webkit-tap-highlight-color: transparent;
}

.faq-toggle [data-lucide] {
    flex-shrink: 0;
    color: var(--color-text-muted);
    transition: transform 0.2s ease;
}

.faq-item.open .faq-toggle [data-lucide] {
    transform: rotate(180deg);
    color: var(--color-primary);
}

.faq-answer {
    display: none;
    padding: 0 var(--spacing-sm) var(--spacing-sm);
}

.faq-item.open .faq-answer {
    display: block;
}

.faq-answer p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ============================================== */
/* Landing footer reference */
/* ============================================== */

.landing-footer {
    padding: 80px 40px 32px;
    margin-top: 80px;
}

/* tighter footer on learn pages with sidebar */
.learn-page--with-sidebar ~ .landing-footer {
    margin-top: 0;
    padding-top: 48px;
}

/* ============================================== */
/* Course page styles */
/* ============================================== */

.course-badges {
    display: flex;
    gap: 0.35rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 0.75rem;
}

.course-aliases {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-style: italic;
    margin-bottom: 0.25rem;
}

.course-section-title {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.quick-facts-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
}

@media (min-width: 600px) {
    .quick-facts-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.quick-fact {
    padding: 0.75rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    text-align: center;
}

html.dark .quick-fact {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.08);
}

.quick-fact-label {
    display: block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-text-muted);
    margin-bottom: 0.25rem;
}

.quick-fact-value {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
}

/* course content lists */
.course-list {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.course-list-item {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 0.6rem 0.75rem;
    border-radius: 6px;
    font-size: 0.85rem;
    line-height: 1.5;
}

.course-list-item svg {
    flex-shrink: 0;
    margin-top: 2px;
}

.benefit-item {
    background: rgba(16, 185, 129, 0.05);
    border: 1px solid rgba(16, 185, 129, 0.12);
}

.risk-item {
    background: rgba(239, 68, 68, 0.05);
    border: 1px solid rgba(239, 68, 68, 0.12);
}

/* course sources */
.course-sources {
    max-width: 600px;
    margin: 0 auto;
}

.course-source {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    padding: 0.35rem 0;
    border-bottom: 1px solid var(--color-border);
}

.course-source:last-child {
    border-bottom: none;
}

/* ============================================== */
/* Explorer credits badge */
/* ============================================== */

.explorer-credits-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.75rem;
    background: rgba(52, 211, 153, 0.08);
    border: 1px solid rgba(52, 211, 153, 0.2);
    border-radius: var(--radius);
    color: var(--color-primary);
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

/* ============================================== */
/* Certification CTA */
/* ============================================== */

.cert-cta {
    display: flex;
    gap: 1rem;
    padding: 1.25rem;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
}

.cert-cta svg {
    flex-shrink: 0;
    margin-top: 0.15rem;
}

.cert-cta-earned svg { color: var(--color-success); }
.cert-cta-ready svg { color: var(--color-primary); }
.cert-cta-progress svg { color: var(--color-muted); }

.cert-cta-title {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--color-text);
}

.cert-cta-desc {
    font-size: 0.85rem;
    color: var(--color-muted);
    line-height: 1.5;
    margin-bottom: 0.75rem;
}

.cert-name-input-group {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.cert-name-input {
    flex: 1;
    min-width: 180px;
    padding: 0.45rem 0.65rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-bg);
    color: var(--color-text);
    font-size: 0.85rem;
}

.cert-name-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.cert-progress-bar {
    width: 100%;
    height: 6px;
    background: var(--color-bg);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 0.35rem;
}

.cert-progress-fill {
    height: 100%;
    background: var(--color-primary);
    border-radius: 3px;
    transition: width 0.3s ease;
}

.cert-progress-label {
    font-size: 0.75rem;
    color: var(--color-muted);
}

/* ============================================== */
/* Community card */
/* ============================================== */

.community-card {
    max-width: 500px;
    margin: 0 auto;
}

.community-card-inner {
    text-align: center;
    padding: 2rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg, 12px);
}

.community-card-inner svg {
    margin-bottom: 1rem;
}

.community-card-inner h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.community-card-inner p {
    font-size: 0.9rem;
    color: var(--color-muted);
    line-height: 1.6;
    margin-bottom: 1.25rem;
}

.community-join-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

/* ============================================== */
/* Loading skeleton for gated content */
/* ============================================== */

.gated-loading-skeleton {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    padding: 2rem 0;
}

.skeleton-block {
    height: 120px;
    border-radius: var(--radius-lg, 12px);
    background: linear-gradient(
        90deg,
        var(--color-border) 25%,
        rgba(52, 211, 153, 0.06) 50%,
        var(--color-border) 75%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s ease-in-out infinite;
}

.skeleton-block:nth-child(2) {
    height: 80px;
}

.skeleton-block:nth-child(3) {
    height: 60px;
    width: 75%;
}

@keyframes skeleton-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

@media (prefers-reduced-motion: reduce) {
    .skeleton-block {
        animation: none;
        opacity: 0.5;
    }
}

/* ============================================== */
/* Blog next best paths */
/* ============================================== */

.blog-next-paths {
    margin: 1rem 0 1.5rem;
    padding: 1rem 1.1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius, 8px);
    background: var(--color-bg-surface, rgba(0, 0, 0, 0.02));
}

.blog-next-paths-title {
    margin: 0;
    font-size: 1rem;
    color: var(--color-text);
}

.blog-next-paths-subtitle {
    margin: 0.45rem 0 0.9rem;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.blog-next-paths-grid {
    display: grid;
    gap: 0.65rem;
}

.blog-next-path-card {
    display: block;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 0.75rem 0.85rem;
    text-decoration: none;
    background: var(--color-disabled-bg);
    transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.blog-next-path-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(16, 24, 40, 0.08);
}

.blog-next-path-label {
    display: block;
    color: var(--color-text);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.blog-next-path-desc {
    display: block;
    color: var(--color-text-muted);
    font-size: 0.86rem;
    line-height: 1.45;
}

@media (min-width: 768px) {
    .blog-next-paths-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}