:root {
    --purple-400: #c084fc;
    --purple-500: #a855f7;
    --purple-600: #9333ea;
    --purple-900: #581c87;
    --bg-dark: #0a0a0f;
    --bg-section: #111118;
    --bg-card: #1a1a24;
    --text-primary: #f5f5f7;
    --text-secondary: #a1a1aa;
    --text-muted: #828288;
    --border: #27272a;
    --radius: 12px;
    --radius-lg: 16px;
    --max-width: 1120px;
    --surface-secondary: #1a1a24;
    --ease-out: cubic-bezier(0.25, 0.1, 0.25, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'SF Pro Display', 'Inter', system-ui, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    letter-spacing: -0.011em;
    font-feature-settings: 'kern' 1, 'liga' 1;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* Global focus ring — Apple-style blue outline */
:focus-visible {
    outline: 2px solid var(--purple-400);
    outline-offset: 3px;
    border-radius: 4px;
}
a:focus-visible, button:focus-visible {
    outline: 2px solid var(--purple-400);
    outline-offset: 3px;
}

.skip-link {
    position: absolute;
    top: -100px;
    left: 16px;
    background: var(--purple-600);
    color: white;
    padding: 10px 16px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    border-radius: var(--radius);
    z-index: 100;
    transition: top 0.2s;
}
.skip-link:focus { top: 16px; }

/* Screen reader only — visually hidden but accessible */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.site-page { min-height: 100vh; display: flex; flex-direction: column; }

/* Header — Apple-style frosted glass nav */
.header-site {
    position: sticky;
    top: 0;
    z-index: 100;
    z-index: 50;
    background: rgba(10, 10, 15, 0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.header-site-nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.header-site-brand {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.025em;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
}
.accent { color: var(--purple-400); }
.accent-gradient {
    background: linear-gradient(135deg, var(--purple-400), var(--purple-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.site-nav-links { display: flex; gap: 24px; align-items: center; }
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 8px 12px;
    min-width: 44px;
    min-height: 44px;
}
.header-site-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
    padding: 10px 4px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
}
.header-site-link:hover { color: var(--text-primary); }
.header-signin-btn {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 10px 18px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.08);
    border: none;
    border-radius: 980px;
    transition: all 0.3s var(--ease-out);
}
.header-signin-btn:hover {
    background: rgba(255, 255, 255, 0.14);
}

/* Hero */
.site-hero {
    padding: 96px 24px 64px;
    text-align: center;
    overflow: hidden;
}
.site-hero-inner { max-width: 720px; margin: 0 auto; will-change: transform, opacity; }
.site-hero-title {
    font-size: clamp(2.5rem, 5.5vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 20px;
}
.site-hero-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 540px;
    margin: 0 auto 32px;
    line-height: 1.6;
}
.site-cta-row { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.site-btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 12px 28px;
    background: linear-gradient(135deg, var(--purple-500), var(--purple-600));
    color: white;
    font-weight: 600;
    font-size: 0.9375rem;
    border-radius: 980px;
    text-decoration: none;
    transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out), filter 0.3s var(--ease-out);
    letter-spacing: -0.01em;
}
.site-btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(168, 85, 247, 0.35);
    filter: brightness(1.1);
}
.site-btn-primary:active { transform: scale(0.98); }
.site-btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 12px 28px;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.9375rem;
    border: 1px solid var(--border);
    border-radius: 980px;
    text-decoration: none;
    transition: all 0.3s var(--ease-out);
    letter-spacing: -0.01em;
}
.site-btn-secondary:hover {
    color: var(--text-primary);
    border-color: var(--text-muted);
    background: rgba(255, 255, 255, 0.03);
}
.site-btn-secondary:active { transform: scale(0.98); }

/* Stats bar */
.site-stats-bar {
    background: var(--bg-section);
    padding: 48px 24px;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.site-stats-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}
.site-stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--purple-400);
    letter-spacing: -0.03em;
    line-height: 1.2;
}
.site-stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-top: 4px;
}

/* Sections */
.site-section { padding: 80px 24px; }
.site-section-alt {
    padding: 80px 24px;
    background: var(--bg-section);
}
.site-container {
    max-width: var(--max-width);
    margin: 0 auto;
}
.text-center { text-align: center; }
.site-section-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--purple-400);
    text-transform: uppercase;
    margin-bottom: 12px;
}
.site-section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}
.site-section-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
}

/* Cards */
.site-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-top: 32px;
}
.site-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    transition: transform 0.2s, border-color 0.2s;
}
.site-card:hover {
    transform: translateY(-4px);
    border-color: var(--purple-500);
}
.site-card-emoji { font-size: 2.5rem; margin-bottom: 16px; }
.site-card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
}
.site-card-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Homepage — Tier Grid */
.homepage-tier-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 40px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}
.homepage-tier-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    transition: transform 0.3s, border-color 0.3s;
}
.homepage-tier-card:hover { transform: translateY(-2px); border-color: var(--purple-500); }
.homepage-tier-emoji { font-size: 2.5rem; margin-bottom: 12px; }
.homepage-tier-name { font-size: 1.1rem; font-weight: 600; color: var(--text-primary); margin-bottom: 4px; }
.homepage-tier-count { font-size: 2rem; font-weight: 800; color: var(--purple-400); margin-bottom: 8px; }
.homepage-tier-label { font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 12px; }
.homepage-tier-desc { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.5; }

/* Homepage — Steps Grid */
.homepage-steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}
.homepage-step { text-align: center; padding: 24px; }
.homepage-step-icon {
    width: 48px; height: 48px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 16px; font-size: 1.4rem;
}
.homepage-step-icon--learn { background: rgba(52, 211, 153, 0.1); }
.homepage-step-icon--study { background: rgba(168, 85, 247, 0.1); }
.homepage-step-icon--prove { background: rgba(251, 146, 60, 0.1); }
.homepage-step-title { font-size: 1rem; font-weight: 600; color: var(--text-primary); margin-bottom: 8px; }
.homepage-step-desc { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.55; }

/* Homepage — Blog Grid */
.homepage-blog-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 32px;
}
.homepage-blog-card {
    display: block;
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: inherit;
    transition: transform 0.3s, border-color 0.3s;
}
.homepage-blog-card:hover { transform: translateY(-2px); border-color: var(--purple-500); }
.homepage-blog-date { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 8px; }
.homepage-blog-title { font-size: 1rem; font-weight: 600; color: var(--text-primary); margin-bottom: 8px; line-height: 1.3; }
.homepage-blog-desc {
    font-size: 0.875rem; color: var(--text-secondary); line-height: 1.5;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}

/* Homepage — Final CTA */
.homepage-final-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
    color: var(--text-primary);
}
.homepage-final-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 480px;
    margin: 0 auto 32px;
    line-height: 1.6;
}

/* Homepage — Card tier label */
.site-card-tier {
    font-size: 0.75rem;
    color: var(--purple-400);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}
.site-card-tier-wrap {
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
}
.homepage-cta-wrap { margin-top: 32px; }

/* Related articles (blog post) */
.related-grid { display: grid; gap: 16px; }
.related-card {
    display: block;
    padding: 20px;
    min-height: 44px;
    border-radius: 12px;
    background: var(--surface-secondary);
    text-decoration: none;
    transition: background 0.2s, border-color 0.2s;
    border: 1px solid transparent;
}
.related-card:hover { border-color: var(--purple-500); background: var(--bg-card); }
.related-card-title { font-weight: 600; color: var(--text-primary); margin-bottom: 6px; }
.related-card-desc { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.5; }
.related-section { padding: 40px 0; }
.related-heading { font-size: 1.1rem; font-weight: 700; margin-bottom: 24px; color: var(--text-primary); }
.blog-article-tags { margin-bottom: 32px; }
.blog-article-footer { text-align: center; padding: 20px 0 40px; }
.blog-cta {
    text-align: center !important;
    padding: 40px 32px;
    margin: 32px 0;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}
.blog-cta .blog-cta-heading {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    text-align: center;
}
.blog-cta .blog-cta-text {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    text-align: center;
}

/* Homepage responsive — mobile-first collapse */
@media (max-width: 768px) {
    .homepage-tier-grid { grid-template-columns: 1fr; gap: 16px; }
    .homepage-steps-grid { grid-template-columns: 1fr; gap: 16px; }
    .homepage-blog-grid { grid-template-columns: 1fr; gap: 12px; }
    .homepage-tier-card { padding: 24px 20px; }
    .homepage-step { padding: 16px; }
    .site-section { padding: 60px 16px; }
    .site-section-alt { padding: 60px 16px; }
}

/* API status */
.api-status {
    margin-top: 24px;
    padding: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: inline-block;
}

/* Footer */
.footer-site {
    margin-top: auto;
    border-top: 1px solid var(--border);
    padding: 48px 24px 24px;
    background: var(--bg-section);
}
.footer-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}
.footer-col-title {
    font-size: .75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--text-primary);
    margin-bottom: 12px;
}
.footer-link {
    display: flex;
    align-items: center;
    min-height: 44px;
    font-size: .85rem;
    color: var(--text-muted);
    text-decoration: none;
    padding: 4px 0;
    transition: color .2s;
}
.footer-link:hover { color: var(--purple-400); }
.footer-subscribe-desc {
    font-size: .8rem;
    color: var(--text-muted);
    margin-bottom: 10px;
    line-height: 1.4;
}
.footer-subscribe-form {
    display: flex;
    gap: 6px;
}
.footer-subscribe-input {
    flex: 1;
    padding: 10px 12px;
    min-height: 44px;
    font-size: .85rem;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    outline: none;
}
.footer-subscribe-input:focus { border-color: var(--purple-400); }
.footer-subscribe-input::placeholder { color: var(--text-muted); }
.footer-subscribe-btn {
    padding: 10px 14px;
    min-height: 44px;
    font-size: .75rem;
    font-weight: 600;
    background: var(--purple-600);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    white-space: nowrap;
    transition: background .2s;
}
.footer-subscribe-btn:hover { background: var(--purple-500); }
.subscribe-success { color: var(--green, #34d399); font-size: .8rem; margin-top: 6px; }
.subscribe-error { color: #f87171; font-size: .8rem; margin-top: 6px; }
.footer-bottom {
    max-width: var(--max-width);
    margin: 32px auto 0;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: .75rem;
    color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); text-decoration: none; padding: 10px 0; min-height: 44px; display: inline-flex; align-items: center; }
.footer-bottom a:hover { color: var(--purple-400); }
.footer-bottom-links { display: flex; gap: 16px; align-items: center; }
@media (max-width: 768px) {
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}
@media (max-width: 480px) {
    .footer-grid { grid-template-columns: 1fr; }
}

/* ============================================
   SIGN IN
   ============================================ */
.signin-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    padding: 14px 24px;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-bottom: 16px;
    min-height: 56px;
    font-family: inherit;
    cursor: pointer;
    border: none;
    box-sizing: border-box;
}
.signin-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}
.signin-btn:focus-visible {
    outline: 2px solid var(--purple-400);
    outline-offset: 2px;
}
.signin-apple {
    background: #fff;
    color: #000;
}
.signin-google {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
}
.signin-email {
    background: var(--purple-400);
    color: #fff;
}
.signin-email:disabled {
    opacity: .6;
    cursor: not-allowed;
    transform: none;
}
.signin-email-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 100%;
}
.signin-email-input {
    width: 100%;
    padding: 14px 18px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    outline: none;
    transition: border-color .2s;
    box-sizing: border-box;
    min-height: 52px;
}
.signin-email-input:focus {
    border-color: var(--purple-400);
}
.signin-email-input::placeholder {
    color: var(--text-muted);
}
.signin-email-status {
    margin-top: 12px;
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: .85rem;
}
.signin-email-sent {
    background: rgba(52, 211, 153, .1);
    border: 1px solid rgba(52, 211, 153, .3);
    color: #34d399;
}
.signin-divider {
    display: flex;
    align-items: center;
    gap: 16px;
    margin: 28px 0;
    color: var(--text-muted);
    font-size: .8rem;
}
.signin-divider::before, .signin-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}
.signin-error {
    margin-top: 16px;
    padding: 10px 16px;
    background: rgba(239, 68, 68, .1);
    border: 1px solid rgba(239, 68, 68, .3);
    border-radius: var(--radius);
    color: #f87171;
    font-size: .85rem;
}

/* ============================================
   ACADEMY
   ============================================ */

/* Academy Hero */
.academy-hero {
    padding: 64px 24px 32px;
    text-align: center;
    background: linear-gradient(180deg, rgba(88, 28, 135, 0.08) 0%, transparent 100%);
}
.academy-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--purple-400);
    text-transform: uppercase;
    margin-bottom: 16px;
    padding: 6px 16px;
    border: 1px solid rgba(192, 132, 252, 0.2);
    border-radius: 9999px;
}
.academy-title {
    font-size: clamp(2.25rem, 5vw, 3.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 12px;
}
.academy-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 520px;
    margin: 0 auto 28px;
    line-height: 1.6;
}
.academy-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    flex-wrap: wrap;
}
.academy-stat { text-align: center; }
.academy-stat-num {
    display: block;
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--purple-400);
    letter-spacing: -0.03em;
    line-height: 1.2;
}
.academy-stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-top: 2px;
}

/* Academy Filters */
.academy-filters {
    padding: 0 24px;
    margin-bottom: 24px;
    position: sticky;
    top: 65px;
    z-index: 40;
    background: rgba(10, 10, 15, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
}
.academy-filter-row {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    gap: 8px;
    padding: 12px 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}
.academy-filter-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s;
    font-family: inherit;
    min-height: 44px;
}
.academy-filter-btn:hover {
    border-color: var(--purple-400);
    color: var(--text-primary);
}
.academy-filter-btn.active {
    background: rgba(168, 85, 247, 0.15);
    border-color: var(--purple-500);
    color: var(--purple-400);
    font-weight: 600;
}
.filter-count {
    font-size: 0.75rem;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.05);
    padding: 2px 8px;
    border-radius: 9999px;
}

/* Academy Course Grid */
.academy-courses { padding: 0 24px 80px; }
.academy-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

/* Course Card */
.course-card {
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-decoration: none;
    color: inherit;
    transition: transform 0.3s var(--ease-out), border-color 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
    position: relative;
    overflow: hidden;
}
.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--purple-400), var(--purple-600));
    opacity: 0;
    transition: opacity 0.3s var(--ease-out);
}
.course-card:hover {
    transform: translateY(-2px);
    border-color: rgba(168, 85, 247, 0.25);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(168, 85, 247, 0.1);
}
.course-card:hover::before { opacity: 1; }
.course-card:focus-visible {
    outline: 2px solid var(--purple-400);
    outline-offset: 2px;
}
.course-card-emoji {
    font-size: 2.5rem;
    margin-bottom: 14px;
    line-height: 1;
}
.course-card-level {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--purple-400);
    text-transform: uppercase;
    margin-bottom: 8px;
}
.course-card-title {
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 8px;
    color: var(--text-primary);
}
.course-card-desc {
    font-size: 0.875rem;
    color: #b4b4be;
    line-height: 1.55;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.course-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}
.course-card-lessons {
    font-size: 0.8rem;
    color: var(--text-muted);
}
.course-card-tier {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: capitalize;
    padding: 2px 10px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 9999px;
}

/* Reading Column — shared by course detail, lesson, blog post */
.reading-column {
    max-width: 680px;
    margin: 0 auto;
    padding: 0 24px;
}
.course-back {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    margin: 24px 0 20px;
    transition: color 0.3s var(--ease-out);
}
.course-back:hover { color: var(--purple-400); }

/* Course Detail — compact, content-first */
.course-detail { padding: 0 0 40px; }
.course-detail-header {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    margin-bottom: 32px;
}
.course-detail-emoji {
    font-size: 3rem;
    line-height: 1;
    flex-shrink: 0;
}
.course-detail-info { flex: 1; }
.course-detail-title {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 8px;
    line-height: 1.2;
}
.course-detail-desc {
    font-size: 1rem;
    color: #b4b4be;
    line-height: 1.55;
    margin-bottom: 8px;
}
.course-detail-meta {
    display: flex;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.85rem;
}
.course-lesson-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 12px;
}
.course-lesson-heading {
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

/* ============================================
   BLOG
   ============================================ */
.blog-list { display: flex; flex-direction: column; gap: 16px; }
.blog-card {
    display: block;
    padding: 28px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: inherit;
    transition: transform 0.3s var(--ease-out), border-color 0.3s var(--ease-out);
}
.blog-card:hover {
    transform: translateY(-2px);
    border-color: rgba(168, 85, 247, 0.25);
}
.blog-card:focus-visible {
    outline: 2px solid var(--purple-400);
    outline-offset: 3px;
}
.blog-card-meta {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 8px;
}
.blog-card-date {
    font-size: 0.8rem;
    color: var(--text-muted);
}
.blog-card-author {
    font-size: 0.8rem;
    color: var(--purple-400);
    font-weight: 500;
}
.blog-card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.015em;
    line-height: 1.3;
}
.blog-card-desc {
    font-size: 0.9rem;
    color: #b4b4be;
    line-height: 1.55;
    margin-bottom: 12px;
}
.blog-card-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.blog-tag, .academy-tag {
    font-size: 0.75rem;
    color: var(--text-secondary);
    padding: 3px 10px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 9999px;
    text-transform: lowercase;
}
/* Blog Article */
.blog-article { padding: 0 0 40px; }
.blog-article-meta {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 12px;
}
.blog-article-title {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 700;
    letter-spacing: -0.025em;
    line-height: 1.2;
    margin-bottom: 12px;
}
.blog-article-lede {
    font-size: 1.1rem;
    color: #b4b4be;
    line-height: 1.55;
    margin-bottom: 16px;
}
.article-divider {
    border: none;
    border-top: 1px solid var(--border);
    margin: 32px 0;
}

/* Article Content — shared by blog posts and lessons */
.article-content {
    font-size: 1.05rem;
    line-height: 1.75;
    color: #d4d4dc;
    letter-spacing: -0.003em;
    overflow-wrap: break-word;
    word-wrap: break-word;
}
.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}
.article-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 2.5rem 0 0.75rem;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}
.article-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 2rem 0 0.5rem;
    color: var(--text-primary);
}
.article-content p { margin-bottom: 1.25rem; }
.article-content ul, .article-content ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
}
.article-content li {
    margin-bottom: 0.5rem;
    line-height: 1.65;
}
.article-content code {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.875em;
    background: rgba(255, 255, 255, 0.06);
    padding: 2px 7px;
    border-radius: 4px;
    color: var(--purple-400);
}
.article-content pre {
    background: #161622;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    overflow-x: auto;
    margin: 1.5rem 0;
    max-width: 100%;
}
.article-content pre code {
    background: none;
    padding: 0;
    color: #d4d4dc;
    font-size: 0.875rem;
    line-height: 1.6;
}
.article-content a {
    color: var(--purple-400);
    text-decoration: underline;
    text-decoration-color: rgba(192, 132, 252, 0.3);
    text-underline-offset: 3px;
    transition: text-decoration-color 0.3s var(--ease-out);
}
.article-content a:hover {
    text-decoration-color: var(--purple-400);
}
.article-content strong {
    color: var(--text-primary);
    font-weight: 600;
}
.article-content blockquote {
    border-left: 3px solid var(--purple-500);
    padding-left: 20px;
    margin: 1.5rem 0;
    color: var(--text-secondary);
    font-style: italic;
}
.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: .9rem;
    overflow-x: auto;
    display: block;
    max-width: 100%;
}
.article-content thead { border-bottom: 2px solid var(--border); }
.article-content th {
    text-align: left;
    padding: 10px 14px;
    font-weight: 600;
    color: var(--text-primary);
    background: rgba(255,255,255,.03);
    white-space: nowrap;
}
.article-content td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
    vertical-align: top;
}
.article-content tr:hover td { background: rgba(255,255,255,.02); }
.article-content tbody tr:nth-child(even) td { background: rgba(255,255,255,.015); }

/* Lesson List */
.lesson-list { display: flex; flex-direction: column; gap: 4px; }
.lesson-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    transition: border-color 0.3s var(--ease-out), transform 0.3s var(--ease-out);
    min-height: 52px;
    text-decoration: none;
    color: inherit;
}
.lesson-row:hover {
    border-color: rgba(168, 85, 247, 0.3);
    transform: translateX(2px);
}
.lesson-row:focus-visible {
    outline: 2px solid var(--purple-400);
    outline-offset: 2px;
}
.lesson-row-left { display: flex; align-items: center; gap: 14px; }
.lesson-row-right { display: flex; align-items: center; gap: 10px; }
.lesson-num {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
    min-width: 22px;
    text-align: center;
}
.lesson-title {
    font-size: 0.925rem;
    font-weight: 500;
    color: var(--text-primary);
}
.lesson-badge {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 9999px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.lesson-free {
    color: #34d399;
    background: rgba(52, 211, 153, 0.1);
}
.lesson-pro {
    color: var(--purple-400);
    background: rgba(168, 85, 247, 0.1);
}
.lesson-arrow {
    color: var(--text-muted);
    font-size: 0.85rem;
    transition: transform 0.3s var(--ease-out);
}
.lesson-row:hover .lesson-arrow { transform: translateX(3px); color: var(--purple-400); }
.lesson-lock { font-size: 0.75rem; opacity: 0.5; }

/* Lesson Page */
.lesson-topbar {
    position: sticky;
    top: 53px;
    z-index: 35;
    background: rgba(10, 10, 15, 0.92);
    backdrop-filter: saturate(180%) blur(16px);
    -webkit-backdrop-filter: saturate(180%) blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    padding: 10px 24px;
}
.lesson-topbar-course {
    display: flex;
    align-items: center;
    gap: 8px;
    min-height: 44px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: color 0.3s var(--ease-out);
}
.lesson-topbar-course:hover { color: var(--purple-400); }
.lesson-topbar-emoji { font-size: 1.1rem; }
.lesson-topbar-pos {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}
.lesson-article { padding: 40px 0 60px; }
.lesson-page-title {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 700;
    letter-spacing: -0.025em;
    line-height: 1.2;
    margin-bottom: 32px;
}
.lesson-content .wrap { max-width: 100%; }
.lesson-content .learn-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 24px;
    margin: 24px 0;
}
.lesson-content .learn-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin: 0 0 10px;
    color: var(--text-primary);
}
.lesson-content .learn-card ul {
    padding-left: 1.25rem;
    margin: 0;
}
.lesson-content .learn-card li {
    font-size: 0.9rem;
    margin-bottom: 4px;
    color: #b4b4be;
}
.lesson-content .lesson-section {
    margin: 32px 0;
}
.lesson-content .section-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--purple-400);
    text-transform: uppercase;
    margin-bottom: 6px;
}
.lesson-content .section-title {
    font-size: 1.35rem;
    font-weight: 600;
    letter-spacing: -0.015em;
    margin-bottom: 12px;
    color: var(--text-primary);
}
.lesson-content .section-text {
    font-size: 1rem;
    line-height: 1.7;
    color: #d4d4dc;
    margin-bottom: 12px;
}

/* Lesson Visual Aids */
.lesson-visual {
    margin: 16px 0;
    background: #0a0a0f;
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius);
    padding: 16px;
    overflow: hidden;
}
.lesson-visual svg {
    width: 100%;
    height: auto;
    display: block;
}
.quiz-visual {
    margin-bottom: 12px;
    background: #0a0a0f;
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 10px;
    padding: 12px;
    overflow: hidden;
}
.quiz-visual svg {
    width: 100%;
    height: auto;
    display: block;
}

/* Lesson Progress */
.lesson-complete-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px;
    margin-top: 32px;
    background: rgba(52, 211, 153, 0.06);
    border: 1px solid rgba(52, 211, 153, 0.15);
    border-radius: var(--radius);
    color: #34d399;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s var(--ease-out);
}
.lesson-complete-bar:hover {
    background: rgba(52, 211, 153, 0.1);
    border-color: rgba(52, 211, 153, 0.25);
}
.lesson-complete-bar.completed {
    background: rgba(52, 211, 153, 0.08);
    border-color: rgba(52, 211, 153, 0.2);
    pointer-events: none;
}
.lesson-row.lesson-done {
    border-color: rgba(52, 211, 153, 0.15);
}
.lesson-row.lesson-done .lesson-num {
    color: #34d399;
}
.lesson-done-check {
    color: #34d399;
    font-size: 0.8rem;
    font-weight: 700;
}
.course-progress-bar {
    height: 4px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 2px;
    overflow: hidden;
    margin-top: 8px;
}
.course-progress-fill {
    height: 100%;
    background: #34d399;
    border-radius: 2px;
    transition: width 0.5s var(--ease-out);
}
.course-progress-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* Lesson Navigation */
.lesson-nav {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
}
.lesson-nav-btn {
    display: flex;
    flex-direction: column;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-decoration: none;
    transition: border-color 0.3s var(--ease-out), transform 0.3s var(--ease-out);
    max-width: 48%;
}
.lesson-nav-btn:hover {
    border-color: rgba(168, 85, 247, 0.3);
    transform: translateY(-1px);
}
.lesson-nav-next { text-align: right; margin-left: auto; }
.lesson-nav-label {
    font-size: 0.75rem;
    color: var(--purple-400);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}
.lesson-nav-title {
    font-size: 0.9rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* ============================================
   QUIZZES & FLASHCARDS
   ============================================ */

/* Quiz Block */
.quiz-block, .flash-block {
    margin: 32px 0;
    padding: 24px;
    background: var(--bg-section);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}
.quiz-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
    letter-spacing: -0.01em;
}

/* Quiz Questions */
.quiz-question {
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}
.quiz-question:last-of-type { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.quiz-q {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.5;
    display: flex;
    gap: 10px;
    align-items: flex-start;
}
.quiz-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 28px;
    height: 28px;
    background: rgba(168, 85, 247, 0.1);
    color: var(--purple-400);
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 700;
    flex-shrink: 0;
}

/* Quiz Options */
.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.quiz-option {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: inherit;
    text-align: left;
    cursor: pointer;
    transition: border-color 0.3s var(--ease-out), background 0.3s var(--ease-out);
    min-height: 48px;
    line-height: 1.4;
}
.quiz-option:hover {
    border-color: rgba(168, 85, 247, 0.3);
    background: rgba(168, 85, 247, 0.04);
}
.quiz-option:focus-visible {
    outline: 2px solid var(--purple-400);
    outline-offset: 2px;
}
.quiz-letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 28px;
    height: 28px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    flex-shrink: 0;
}

/* Quiz Correct/Wrong States */
.quiz-option.quiz-correct {
    border-color: #34d399;
    background: rgba(52, 211, 153, 0.08);
}
.quiz-option.quiz-correct .quiz-letter {
    background: rgba(52, 211, 153, 0.2);
    color: #34d399;
}
.quiz-option.quiz-wrong {
    border-color: #f87171;
    background: rgba(248, 113, 113, 0.08);
}
.quiz-option.quiz-wrong .quiz-letter {
    background: rgba(248, 113, 113, 0.2);
    color: #f87171;
}
/* After answering, dim all other options */
.quiz-options.revealed .quiz-option:not(.quiz-correct):not(.quiz-wrong) {
    opacity: 0.4;
    pointer-events: none;
}
.quiz-options.revealed .quiz-option { pointer-events: none; }

/* Sequential quiz mode — one question at a time */
.quiz-block.quiz-sequential .quiz-question { display: none; }
.quiz-block.quiz-sequential .quiz-question.quiz-active { display: block; }
.quiz-progress {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}
.quiz-progress-text {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}
.quiz-progress-dots {
    display: flex;
    gap: 6px;
}
.quiz-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
    transition: background 0.3s var(--ease-out);
}
.quiz-dot.dot-correct { background: #34d399; }
.quiz-dot.dot-wrong { background: #f87171; }
.quiz-dot.dot-current { background: var(--purple-400); }
.quiz-next-btn {
    display: none;
    width: 100%;
    padding: 12px;
    margin-top: 16px;
    background: rgba(168, 85, 247, 0.12);
    border: 1px solid rgba(168, 85, 247, 0.25);
    border-radius: 10px;
    color: var(--purple-400);
    font-size: 0.9rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.3s var(--ease-out);
    min-height: 48px;
}
.quiz-next-btn:hover {
    background: rgba(168, 85, 247, 0.18);
    border-color: rgba(168, 85, 247, 0.4);
}
.quiz-next-btn.visible { display: block; }
.quiz-complete-msg {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}
.quiz-complete-msg strong { color: #34d399; }

/* Quiz Explanation */
.quiz-explanation {
    margin-top: 12px;
    padding: 14px 16px;
    background: rgba(52, 211, 153, 0.04);
    border-left: 3px solid #34d399;
    border-radius: 0 8px 8px 0;
    font-size: 0.875rem;
    line-height: 1.55;
    color: #b4b4be;
}
.quiz-explanation strong { color: #34d399; }

/* Flashcard Deck */
.flash-card {
    margin-bottom: 6px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    transition: border-color 0.3s var(--ease-out);
}
.flash-card:hover { border-color: rgba(168, 85, 247, 0.2); }
.flash-card[open] { border-color: rgba(168, 85, 247, 0.3); }
.flash-front {
    padding: 14px 16px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 48px;
}
.flash-front::-webkit-details-marker { display: none; }
.flash-front::after {
    content: '+';
    font-size: 1.2rem;
    color: var(--text-muted);
    font-weight: 400;
    transition: transform 0.3s var(--ease-out);
}
.flash-card[open] .flash-front::after {
    content: '\2212';
    color: var(--purple-400);
}
.flash-back {
    padding: 0 16px 16px;
    font-size: 0.875rem;
    line-height: 1.6;
    color: #b4b4be;
    border-top: 1px solid var(--border);
    padding-top: 12px;
}

/* Quiz Score Counter */
.quiz-score {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    margin-bottom: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: border-color 0.3s var(--ease-out);
}
.quiz-score-label { font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; font-size: 0.75rem; }
.quiz-score-correct { color: #34d399; font-weight: 700; font-size: 1.1rem; font-variant-numeric: tabular-nums; }
.quiz-score-wrong { color: #f87171; font-weight: 700; font-size: 1.1rem; font-variant-numeric: tabular-nums; }
.quiz-score-divider { color: var(--border); }
.quiz-score-total { color: var(--text-muted); font-size: 0.8rem; }
.quiz-score.quiz-score-perfect { border-color: rgba(52, 211, 153, 0.3); background: rgba(52, 211, 153, 0.04); }
.quiz-score-bar {
    flex: 1;
    height: 4px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 2px;
    overflow: hidden;
}
.quiz-score-fill {
    height: 100%;
    background: linear-gradient(90deg, #34d399, #34d399);
    border-radius: 2px;
    width: 0%;
    transition: width 0.5s var(--ease-out);
}

/* Wrong Answer Shake */
@keyframes quiz-shake {
    0%, 100% { transform: translateX(0); }
    15% { transform: translateX(-6px); }
    30% { transform: translateX(5px); }
    45% { transform: translateX(-4px); }
    60% { transform: translateX(3px); }
    75% { transform: translateX(-2px); }
    90% { transform: translateX(1px); }
}
.quiz-option.quiz-wrong {
    animation: quiz-shake 0.5s var(--ease-out);
    border-color: #f87171;
    background: rgba(248, 113, 113, 0.08);
}

/* Correct Answer Pulse */
@keyframes quiz-pulse {
    0% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.3); }
    50% { box-shadow: 0 0 0 6px rgba(52, 211, 153, 0); }
    100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); }
}
.quiz-option.quiz-correct {
    animation: quiz-pulse 0.6s var(--ease-out);
}

/* Flashcard Study Mode */
.flash-study-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}
.flash-study-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    background: rgba(168, 85, 247, 0.1);
    border: 1px solid rgba(168, 85, 247, 0.2);
    border-radius: 9999px;
    color: var(--purple-400);
    font-size: 0.8rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.3s var(--ease-out);
    min-height: 44px;
}
.flash-study-btn:hover {
    background: rgba(168, 85, 247, 0.15);
    border-color: rgba(168, 85, 247, 0.35);
}
.flash-study-btn:focus-visible {
    outline: 2px solid var(--purple-400);
    outline-offset: 2px;
}
.flash-study-btn.active {
    background: var(--purple-500);
    border-color: var(--purple-500);
    color: white;
}
.flash-study-progress {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}
.flash-block.study-mode .flash-card {
    display: none;
}
.flash-block.study-mode .flash-card.study-active {
    display: block;
}
.flash-study-nav {
    display: none;
    justify-content: center;
    gap: 12px;
    margin-top: 12px;
}
.flash-block.study-mode .flash-study-nav {
    display: flex;
}
.flash-nav-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.3s var(--ease-out);
    min-height: 44px;
}
.flash-nav-btn:hover {
    border-color: rgba(168, 85, 247, 0.3);
    color: var(--text-primary);
}
.flash-nav-btn:disabled {
    opacity: 0.3;
    pointer-events: none;
}

/* Quiz Error */
.quiz-error {
    padding: 16px;
    background: rgba(248, 113, 113, 0.05);
    border: 1px solid rgba(248, 113, 113, 0.2);
    border-radius: 8px;
    color: #f87171;
    font-size: 0.9rem;
}

/* Narration Block (used in lessons) */
.lesson-content .narration {
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    line-height: 1.6;
    color: #b4b4be;
}
.lesson-content .narration strong { color: var(--text-primary); }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
    .academy-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .site-stats-grid { grid-template-columns: repeat(2, 1fr); }
    .site-hero { padding: 80px 16px 60px; }
    .mobile-menu-btn { display: block; }
    .site-nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-dark);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        padding: 16px 24px;
        gap: 4px;
    }
    .site-nav-links.nav-open { display: flex; }
    .site-nav-links .header-site-link {
        display: block;
        padding: 10px 0;
        font-size: .95rem;
        border-bottom: 1px solid rgba(255,255,255,.04);
    }
    .site-nav-links .header-signin-btn {
        margin-top: 8px;
        text-align: center;
    }
    .academy-grid { grid-template-columns: 1fr; }
    .academy-stats { gap: 24px; }
    .academy-hero { padding: 60px 16px 32px; }
}
@media (max-width: 480px) {
    .site-cta-row { flex-direction: column; align-items: center; }
    .site-stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .academy-filter-row { gap: 6px; }
    .reading-column { padding: 0 16px; }
}

/* ============================================
   VISUAL AID SYSTEM v3
   Apple-inspired. WCAG AA. System fonts.
   Components: lo-vis, lo-steps, lo-versus, lo-calc
   ============================================ */

.lo-vis {
  --vis-bg: #0c0c10;
  --vis-surface: #141418;
  --vis-border: rgba(255,255,255,.08);
  --vis-text: #f0f0f2;
  --vis-secondary: #b0b0b8;
  --vis-tertiary: #8b8b95;
  --vis-green: #4ade80;
  --vis-purple: #c4b5fd;
  --vis-blue: #7dd3fc;
  --vis-orange: #fdba74;
  --vis-red: #fca5a5;
  --vis-green-bg: rgba(74,222,128,.06);
  --vis-purple-bg: rgba(196,181,253,.06);
  --vis-blue-bg: rgba(125,211,252,.06);
  --vis-orange-bg: rgba(253,186,116,.06);
  --vis-red-bg: rgba(252,165,165,.06);
  --vis-green-border: rgba(74,222,128,.12);
  --vis-purple-border: rgba(196,181,253,.12);
  --vis-blue-border: rgba(125,211,252,.12);
  --vis-orange-border: rgba(253,186,116,.12);
  --vis-red-border: rgba(252,165,165,.12);
  --vis-font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif;
  --vis-mono: "SF Mono", "JetBrains Mono", "Fira Code", monospace;
  --sp-1: 4px; --sp-2: 8px; --sp-3: 12px; --sp-4: 16px; --sp-6: 24px; --sp-8: 32px;
  --r-sm: 10px; --r-md: 14px; --r-lg: 18px;
  font-family: var(--vis-font);
  background: var(--vis-bg);
  border: 1px solid var(--vis-border);
  border-radius: var(--r-lg);
  padding: var(--sp-8) var(--sp-6);
  margin: var(--sp-6) 0;
  max-width: 100%;
}
.lo-vis * { box-sizing: border-box; }
.lo-vis__title {
  font-size: .75rem; font-weight: 600; color: var(--vis-tertiary);
  letter-spacing: .1em; text-transform: uppercase; text-align: center;
  margin-bottom: var(--sp-6);
}
.lo-vis__caption {
  font-size: .875rem; color: var(--vis-secondary); text-align: center;
  margin-top: var(--sp-6); line-height: 1.5;
}
.lo-vis__caption strong { color: var(--vis-text); font-weight: 600; }
@media (prefers-reduced-motion: reduce) {
  .lo-vis, .lo-vis * { animation: none !important; transition: none !important; }
}

/* lo-steps */
.lo-steps { display: grid; gap: var(--sp-3); }
.lo-steps[data-count="3"] { grid-template-columns: 1fr auto 1fr auto 1fr; }
.lo-steps[data-count="4"] { grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr; }
.lo-steps[data-count="5"] { grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr auto 1fr; }
.lo-step {
  background: var(--vis-surface); border: 1px solid var(--vis-border);
  border-radius: var(--r-md); padding: var(--sp-6) var(--sp-4);
  text-align: center; display: flex; flex-direction: column; align-items: center; gap: var(--sp-2);
}
.lo-step__num {
  font-family: var(--vis-mono); font-size: .75rem; font-weight: 600;
  letter-spacing: .08em; padding: 2px 10px; border-radius: 100px;
  border: 1.5px solid currentColor; opacity: .6;
}
.lo-step__label { font-size: .95rem; font-weight: 700; letter-spacing: -.01em; line-height: 1.2; }
.lo-step__desc { font-size: .8rem; color: var(--vis-secondary); line-height: 1.45; }
.lo-step--green  { color: var(--vis-green);  border-color: var(--vis-green-border);  background: var(--vis-green-bg); }
.lo-step--purple { color: var(--vis-purple); border-color: var(--vis-purple-border); background: var(--vis-purple-bg); }
.lo-step--blue   { color: var(--vis-blue);   border-color: var(--vis-blue-border);   background: var(--vis-blue-bg); }
.lo-step--orange { color: var(--vis-orange); border-color: var(--vis-orange-border); background: var(--vis-orange-bg); }
.lo-step--red    { color: var(--vis-red);    border-color: var(--vis-red-border);    background: var(--vis-red-bg); }
.lo-step--green .lo-step__desc, .lo-step--purple .lo-step__desc,
.lo-step--blue .lo-step__desc, .lo-step--orange .lo-step__desc,
.lo-step--red .lo-step__desc { color: var(--vis-secondary); }
.lo-steps__arrow {
  display: flex; align-items: center; justify-content: center;
  color: var(--vis-tertiary); font-size: 1rem; min-width: 20px;
}

/* lo-versus */
.lo-versus { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-4); }
.lo-versus__side { padding: var(--sp-6); border-radius: var(--r-md); }
.lo-versus__side--before { background: var(--vis-red-bg); border: 1px solid var(--vis-red-border); }
.lo-versus__side--after  { background: var(--vis-green-bg); border: 1px solid var(--vis-green-border); }
.lo-versus__tag {
  display: inline-block; font-size: .75rem; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; padding: 3px 10px; border-radius: 6px; margin-bottom: var(--sp-4);
}
.lo-versus__side--before .lo-versus__tag { color: var(--vis-red); background: rgba(252,165,165,.1); }
.lo-versus__side--after .lo-versus__tag  { color: var(--vis-green); background: rgba(74,222,128,.1); }
.lo-versus__body { font-size: .9rem; color: var(--vis-secondary); line-height: 1.6; }
.lo-versus__body strong { color: var(--vis-text); }
.lo-versus__result {
  font-size: .8rem; font-weight: 600; margin-top: var(--sp-4);
  padding-top: var(--sp-3); border-top: 1px solid var(--vis-border);
}
.lo-versus__side--before .lo-versus__result { color: var(--vis-red); }
.lo-versus__side--after .lo-versus__result  { color: var(--vis-green); }

/* lo-calc */
.lo-calc { display: grid; gap: var(--sp-3); }
.lo-calc[data-cols="3"] { grid-template-columns: 1fr auto 1fr auto 1fr; }
.lo-calc__col {
  background: var(--vis-surface); border: 1px solid var(--vis-border);
  border-radius: var(--r-md); padding: var(--sp-6) var(--sp-4);
}
.lo-calc__heading {
  font-size: .75rem; font-weight: 600; color: var(--vis-tertiary);
  letter-spacing: .08em; text-transform: uppercase; text-align: center;
  margin-bottom: var(--sp-4);
}
.lo-calc__row {
  display: flex; align-items: center; justify-content: center; gap: 6px;
  padding: 8px 10px; border-radius: var(--r-sm); margin-bottom: 6px;
  font-family: var(--vis-mono); font-size: .85rem;
}
.lo-calc__row--green  { background: var(--vis-green-bg);  border: 1px solid var(--vis-green-border); }
.lo-calc__row--purple { background: var(--vis-purple-bg); border: 1px solid var(--vis-purple-border); }
.lo-calc__row--blue   { background: var(--vis-blue-bg);   border: 1px solid var(--vis-blue-border); }
.lo-calc__val { font-weight: 700; }
.lo-calc__op  { color: var(--vis-tertiary); font-size: .75rem; }
.lo-calc__sub { font-size: .75rem; color: var(--vis-tertiary); }
.lo-calc__total {
  margin-top: var(--sp-3); padding: var(--sp-3); border-radius: var(--r-sm);
  text-align: center; font-family: var(--vis-mono); font-size: 1.1rem; font-weight: 800;
}
.lo-calc__arrow {
  display: flex; align-items: center; justify-content: center;
  color: var(--vis-tertiary); font-size: 1rem; min-width: 20px;
}

/* v2 backwards compat — map old classes to v3 */
.lo-visual { /* v2 wrapper — keep functional */
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", system-ui, sans-serif;
  background: #0c0c10; border: 1px solid rgba(255,255,255,.08);
  border-radius: 18px; padding: 32px 24px; margin: 24px 0;
  max-width: 100%;
}
.lo-visual * { box-sizing: border-box; }
.lo-visual__title {
  font-size: .75rem; font-weight: 600; color: #8b8b95;
  letter-spacing: .1em; text-transform: uppercase; text-align: center; margin-bottom: 24px;
}
.lo-visual__caption {
  font-size: .875rem; color: #b0b0b8; text-align: center; margin-top: 24px; line-height: 1.5;
}
.lo-visual__caption strong { color: #f0f0f2; font-weight: 600; }

/* v3 responsive */
@media (max-width: 640px) {
  .lo-steps[data-count] { grid-template-columns: 1fr !important; }
  .lo-steps__arrow { transform: rotate(90deg); padding: var(--sp-1) 0; justify-self: center; }
  .lo-versus { grid-template-columns: 1fr; }
  .lo-calc[data-cols] { grid-template-columns: 1fr !important; }
  .lo-calc__arrow { transform: rotate(90deg); padding: var(--sp-1) 0; justify-self: center; }
  .lo-flow { grid-template-columns: 1fr !important; gap: .5rem; }
  .lo-flow__arrow { transform: rotate(90deg); padding: .25rem 0; }
  .lo-compare { grid-template-columns: 1fr; gap: .75rem; }
  .lo-compare__divider { transform: rotate(90deg); padding: .5rem 0; }
  .lo-compute { grid-template-columns: 1fr !important; gap: .5rem; }
  .lo-compute__arrow { transform: rotate(90deg); padding: .25rem 0; }

  /* Visual containers: tighter padding on mobile */
  .lo-vis { padding: var(--sp-4) var(--sp-3); border-radius: var(--r-md); }
  .lo-visual { padding: 20px 16px; border-radius: 14px; }

  /* Code blocks: smaller font, tighter padding on mobile */
  .article-content pre { padding: 14px; font-size: 0.8rem; }
  .article-content pre code { font-size: 0.8rem; }

  /* Inline code/prompt blocks: wrap text instead of horizontal scroll on mobile */
  [style*="overflow-x:auto"], [style*="overflow-x: auto"] {
    overflow-x: visible !important;
    word-break: break-word;
    overflow-wrap: break-word;
  }

  /* Lesson visuals: let SVGs scale fully */
  .lesson-visual { padding: 10px; }
  .quiz-visual { padding: 8px; }
}

/* ═══════════════════════════════════════════
   INTERACTIVE ELEMENTS (Alpine.js)
   ═══════════════════════════════════════════ */

.lo-interactive {
  margin: 1.5rem 0;
  background: #0a0a0f;
  border: 1px solid rgba(192,132,252,.12);
  border-radius: 16px;
  padding: 1.25rem 1.5rem;
  overflow: hidden;
}
.lo-interactive__title {
  font-family: 'SF Mono','JetBrains Mono',monospace;
  font-size: .75rem;
  font-weight: 700;
  color: #c084fc;
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: 1rem;
}
.lo-interactive__body {
  display: flex;
  flex-direction: column;
  gap: .75rem;
}
.lo-interactive label {
  display: flex;
  align-items: center;
  gap: .75rem;
  font-size: .85rem;
  color: #a1a1aa;
  font-family: 'SF Mono','JetBrains Mono',monospace;
}
.lo-interactive input[type="range"] {
  flex: 1;
  accent-color: #c084fc;
  height: 4px;
  cursor: pointer;
}
.lo-interactive__result {
  margin-top: .5rem;
  padding: .75rem 1rem;
  background: rgba(255,255,255,.02);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: 10px;
  font-family: 'SF Mono','JetBrains Mono',monospace;
  font-size: .9rem;
  color: #e5e5e5;
  display: flex;
  align-items: center;
  gap: .75rem;
}
.lo-interactive__result .fires { color: #34d399; font-weight: 700; }
.lo-interactive__result .silent { color: #ef4444; font-weight: 700; }

/* Step-through nav */
.lo-interactive__nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  padding-top: .75rem;
  border-top: 1px solid rgba(255,255,255,.06);
}
.lo-interactive__nav button {
  background: rgba(192,132,252,.08);
  border: 1px solid rgba(192,132,252,.2);
  color: #c084fc;
  padding: .4rem 1rem;
  border-radius: 8px;
  font-size: .8rem;
  cursor: pointer;
  transition: background .15s;
}
.lo-interactive__nav button:hover:not(:disabled) {
  background: rgba(192,132,252,.15);
}
.lo-interactive__nav button:disabled {
  opacity: .3;
  cursor: not-allowed;
}
.lo-interactive__nav span {
  font-size: .75rem;
  color: #71717a;
  font-family: 'SF Mono','JetBrains Mono',monospace;
}

/* Value display for sliders */
.lo-interactive .value-display {
  min-width: 3rem;
  text-align: right;
  font-weight: 600;
  color: #e5e5e5;
  font-size: .85rem;
}

/* Responsive */
@media (max-width: 640px) {
  .lo-interactive { padding: 1rem; }
  .lo-interactive label { flex-wrap: wrap; }
}

/* ===== PAGES: About, Pricing, Foundation ===== */
.page-hero {
    padding: 100px 20px 60px;
    text-align: center;
}
.page-hero-title {
    font-size: clamp(2rem, 5vw, 3.25rem);
    font-weight: 800;
    letter-spacing: -.03em;
    line-height: 1.1;
    margin-bottom: 16px;
    color: var(--text-primary);
}
.page-hero-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.6;
}

/* About */
.about-text {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}
.about-pillars {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 32px;
}
.about-pillar {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
}
.about-pillar-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: .85rem;
    font-weight: 700;
    margin-bottom: 16px;
}
.about-pillar-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}
.about-pillar-text {
    font-size: .875rem;
    color: var(--text-secondary);
    line-height: 1.55;
}
.about-team-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 24px;
}
.about-team-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
}
.about-team-name {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}
.about-team-role {
    font-size: .8rem;
    color: var(--purple-400);
    text-transform: uppercase;
    letter-spacing: .06em;
    font-weight: 600;
    margin-bottom: 12px;
}
.about-team-bio {
    font-size: .875rem;
    color: var(--text-secondary);
    line-height: 1.55;
}
.about-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-top: 24px;
}
.about-stat {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px 16px;
    text-align: center;
}
.about-stat-num {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--purple-400);
    letter-spacing: -.02em;
}
.about-stat-label {
    font-size: .75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: .08em;
    margin-top: 4px;
}

/* Pricing */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 8px;
}
.pricing-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    position: relative;
    display: flex;
    flex-direction: column;
}
.pricing-card-free {
    border-color: var(--purple-400);
    box-shadow: 0 0 40px rgba(168, 85, 247, .08);
}
.pricing-badge {
    font-size: .75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--purple-400);
    margin-bottom: 16px;
}
.pricing-badge-soon {
    color: var(--text-muted);
}
.pricing-plan-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}
.pricing-price {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -.03em;
    line-height: 1;
}
.pricing-period {
    font-size: .8rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}
.pricing-features {
    list-style: none;
    flex: 1;
    margin-bottom: 24px;
}
.pricing-features li {
    font-size: .875rem;
    color: var(--text-secondary);
    padding: 6px 0;
    border-bottom: 1px solid rgba(39, 39, 42, .5);
    line-height: 1.4;
}
.pricing-features li::before {
    content: "\2713  ";
    color: var(--green, #34d399);
    font-weight: 600;
}
.pricing-card-pro {
    border-color: var(--purple-400);
    box-shadow: 0 0 60px rgba(168, 85, 247, .12);
    transform: scale(1.02);
}
.pricing-badge-pro {
    color: var(--purple-400);
    background: rgba(192, 132, 252, .1);
    padding: 4px 12px;
    border-radius: 20px;
    display: inline-block;
}
.pricing-card-annual {
    border-color: rgba(212, 165, 116, .4);
    box-shadow: 0 0 40px rgba(212, 165, 116, .08);
}
.pricing-badge-save {
    color: #d4a574;
    background: rgba(212, 165, 116, .1);
    padding: 4px 12px;
    border-radius: 20px;
    display: inline-block;
}
.pricing-card-coming {
    opacity: .65;
}
.pricing-coming-label {
    font-size: .85rem;
    color: var(--text-muted);
    text-align: center;
    padding: 10px;
    border: 1px dashed var(--border);
    border-radius: var(--radius);
    margin-top: auto;
}
.pricing-faq {
    margin-top: 32px;
}
.pricing-faq-item {
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
}
.pricing-faq-q {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}
.pricing-faq-a {
    font-size: .9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Foundation */
.foundation-phases {
    display: grid;
    gap: 0;
    margin-top: 32px;
    border-left: 2px solid var(--border);
    padding-left: 0;
}
.foundation-phase {
    padding: 24px 0 24px 28px;
    position: relative;
}
.foundation-phase::before {
    content: '';
    position: absolute;
    left: -7px;
    top: 28px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--border);
    border: 2px solid var(--bg-dark);
}
.foundation-phase-active::before {
    background: var(--purple-400);
    box-shadow: 0 0 12px rgba(168, 85, 247, .4);
}
.foundation-phase-marker {
    font-size: .75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--text-muted);
    margin-bottom: 6px;
}
.foundation-phase-active .foundation-phase-marker {
    color: var(--purple-400);
}
.foundation-phase-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}
.foundation-phase-text {
    font-size: .875rem;
    color: var(--text-secondary);
    line-height: 1.55;
}
.foundation-ledger {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-top: 24px;
}
.foundation-ledger-row {
    display: flex;
    justify-content: space-between;
    padding: 14px 24px;
    border-bottom: 1px solid rgba(39, 39, 42, .5);
    font-size: .9rem;
}
.foundation-ledger-row:last-child {
    border-bottom: none;
}
.foundation-ledger-label {
    color: var(--text-muted);
}
.foundation-ledger-value {
    color: var(--text-primary);
    font-weight: 500;
}

/* ===== TRACKS ===== */
.tracks-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}
.track-card {
    display: block;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    text-decoration: none;
    color: inherit;
    transition: transform .2s, border-color .2s;
}
.track-card:hover {
    transform: translateY(-2px);
    border-color: var(--track-color, var(--purple-400));
}
.track-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}
.track-card-emoji { font-size: 2rem; }
.track-card-difficulty {
    font-size: .75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--text-secondary);
    background: rgba(255,255,255,.05);
    padding: 4px 10px;
    border-radius: 20px;
}
.track-card-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
}
.track-card-desc {
    font-size: .85rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 16px;
}
.track-card-meta {
    display: flex;
    gap: 16px;
    font-size: .75rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}
.track-card-bar {
    height: 4px;
    background: rgba(255,255,255,.05);
    border-radius: 2px;
    overflow: hidden;
}
.track-card-bar-fill {
    height: 100%;
    border-radius: 2px;
    transition: width .5s var(--ease-out);
}

/* Track detail */
.track-back-link {
    display: inline-block;
    font-size: .8rem;
    color: var(--text-muted);
    text-decoration: none;
    margin-bottom: 20px;
}
.track-back-link:hover { color: var(--purple-400); }
.track-detail-header {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}
.track-detail-emoji { font-size: 3rem; }
.track-detail-title {
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    font-weight: 800;
    letter-spacing: -.02em;
    color: var(--text-primary);
    margin-bottom: 8px;
}
.track-detail-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 12px;
}
.track-detail-meta {
    display: flex;
    gap: 12px;
    align-items: center;
}
.track-detail-badge {
    font-size: .75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    padding: 4px 12px;
    border-radius: 20px;
}
.track-detail-stat {
    font-size: .8rem;
    color: var(--text-muted);
}
.track-courses-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.track-course-row {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-decoration: none;
    color: inherit;
    transition: border-color .2s;
}
.track-course-row:hover {
    border-color: var(--purple-400);
}
.track-course-num {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: rgba(168, 85, 247, .1);
    color: var(--purple-400);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: .8rem;
    font-weight: 700;
    flex-shrink: 0;
}
.track-course-info {
    display: flex;
    gap: 12px;
    align-items: center;
    flex: 1;
    min-width: 0;
}
.track-course-emoji { font-size: 1.5rem; flex-shrink: 0; }
.track-course-title {
    font-size: .95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}
.track-course-desc {
    font-size: .8rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.track-course-arrow {
    color: var(--text-muted);
    font-size: 1.1rem;
    flex-shrink: 0;
}
.track-course-status {
    flex-shrink: 0;
    min-width: 32px;
    text-align: center;
}
.track-course-done {
    border-color: rgba(52, 211, 153, .3);
}
.track-progress-wrap {
    margin-bottom: 24px;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}
.track-progress-label {
    font-size: .85rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}
.track-progress-bar {
    height: 6px;
    background: rgba(255,255,255,.05);
    border-radius: 3px;
    overflow: hidden;
}
.track-progress-fill {
    height: 100%;
    border-radius: 3px;
    transition: width .8s var(--ease-out);
}

/* ===== CERTIFICATE ===== */
.cert-page {
    padding: 80px 20px 60px;
}
.cert-frame {
    background: linear-gradient(135deg, #1a1a24 0%, #111118 100%);
    border: 2px solid var(--border);
    border-radius: 20px;
    padding: 48px 40px;
    position: relative;
    overflow: hidden;
}
.cert-frame::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--purple-400), #e879f9, var(--purple-400));
}
.cert-header {
    text-align: center;
    margin-bottom: 32px;
}
.cert-logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -.03em;
    color: var(--text-primary);
}
.cert-academy {
    font-size: .75rem;
    text-transform: uppercase;
    letter-spacing: .15em;
    color: var(--text-muted);
    margin-top: 2px;
}
.cert-type-badge {
    text-align: center;
    font-size: .75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    padding: 6px 16px;
    border-radius: 20px;
    display: inline-block;
    margin: 0 auto 32px;
    width: fit-content;
    display: block;
    margin-left: auto;
    margin-right: auto;
}
.cert-body {
    text-align: center;
    margin-bottom: 40px;
}
.cert-label {
    font-size: .8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: .08em;
    margin-bottom: 8px;
}
.cert-recipient {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -.02em;
    margin-bottom: 24px;
}
.cert-title {
    font-size: clamp(1.1rem, 3vw, 1.5rem);
    font-weight: 600;
    color: var(--purple-400);
    margin-bottom: 16px;
}
.cert-date {
    font-size: .85rem;
    color: var(--text-muted);
}
.cert-footer {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    border-top: 1px solid var(--border);
    padding-top: 24px;
}
.cert-sig-line {
    width: 120px;
    border-bottom: 1px solid var(--text-muted);
    margin-bottom: 8px;
}
.cert-sig-name {
    font-size: .9rem;
    font-weight: 600;
    color: var(--text-primary);
    font-style: italic;
}
.cert-sig-role {
    font-size: .75rem;
    color: var(--text-muted);
}
.cert-verify {
    text-align: right;
}
.cert-id {
    font-size: .75rem;
    color: var(--text-muted);
    font-family: 'SF Mono', 'JetBrains Mono', monospace;
    margin-bottom: 4px;
}
.cert-verify-url {
    font-size: .6rem;
    color: var(--text-muted);
    font-family: 'SF Mono', 'JetBrains Mono', monospace;
}
.cert-actions {
    text-align: center;
    margin-top: 24px;
}
.cert-verified {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: .85rem;
    color: var(--green, #34d399);
    font-weight: 600;
}
.cert-verified-icon {
    font-size: 1.1rem;
}
.cert-share-row {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-top: 16px;
}
.cert-share-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 12px 24px;
    font-size: .85rem;
    font-weight: 600;
    border-radius: var(--radius);
    text-decoration: none;
    transition: transform .2s, background .2s;
    background: var(--purple-400);
    color: #fff;
}
.cert-share-btn:hover { transform: translateY(-1px); }
.cert-share-copy {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
}
.cert-share-copy:hover { border-color: var(--purple-400); color: var(--text-primary); }

/* ===== ACCOUNT ===== */
.account-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
}
.account-badge {
    background: var(--purple-900);
    color: var(--purple-400);
    padding: 4px 12px;
    border-radius: 9999px;
    font-size: .8rem;
    text-transform: capitalize;
    font-weight: 600;
}
.account-section-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}
.account-empty {
    padding: 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: .9rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}
.account-cert-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-decoration: none;
    color: inherit;
    margin-bottom: 8px;
    transition: border-color .2s;
}
.account-cert-row:hover { border-color: var(--purple-400); }
.account-cert-type {
    font-size: .75rem;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--purple-400);
    font-weight: 700;
    margin-bottom: 2px;
}
.account-cert-title {
    font-size: .95rem;
    font-weight: 600;
    color: var(--text-primary);
}
.account-cert-date {
    font-size: .75rem;
    color: var(--text-muted);
    margin-top: 2px;
}
.account-cert-view {
    color: var(--text-muted);
    font-size: .85rem;
}
.account-progress-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 6px;
}
.account-progress-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 20px;
    margin-bottom: 10px;
}
.account-progress-link {
    font-size: .9rem;
    color: var(--text-primary);
    text-decoration: none;
    text-transform: capitalize;
}
.account-progress-link:hover { color: var(--purple-400); }
.account-progress-count {
    font-size: .8rem;
    color: var(--text-muted);
}

/* ===== TOAST NOTIFICATIONS ===== */
.lo-toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    padding: 14px 24px;
    border-radius: var(--radius);
    font-size: .9rem;
    font-weight: 500;
    color: #fff;
    z-index: 9999;
    transform: translateY(20px);
    opacity: 0;
    transition: transform .3s var(--ease-spring), opacity .3s;
    pointer-events: none;
}
.lo-toast-show {
    transform: translateY(0);
    opacity: 1;
}
.lo-toast-success {
    background: linear-gradient(135deg, #059669, #34d399);
    box-shadow: 0 4px 20px rgba(52, 211, 153, .3);
}
.lo-toast-gold {
    background: linear-gradient(135deg, #d97706, #fbbf24);
    box-shadow: 0 4px 20px rgba(251, 191, 36, .3);
    color: #1a1a24;
}

/* Responsive: Pages + Tracks + Certs */
@media (max-width: 768px) {
    .about-pillars { grid-template-columns: 1fr; }
    .about-team-grid { grid-template-columns: 1fr; }
    .about-stats-grid { grid-template-columns: repeat(2, 1fr); }
    .pricing-grid { grid-template-columns: 1fr; max-width: 380px; margin-left: auto; margin-right: auto; }
    .tracks-grid { grid-template-columns: 1fr; }
    .track-detail-header { flex-direction: column; }
    .track-course-desc { display: none; }
    .cert-frame { padding: 32px 24px; }
    .cert-footer { flex-direction: column; gap: 20px; align-items: center; }
    .cert-verify { text-align: center; }
}