/* ==========================================================================
   Become an FDE — Premium Course Design System v3.1
   Serving dark first, light via [data-theme=light].
   Fonts: Plus Jakarta Sans (UI) & JetBrains Mono (Code).
   ========================================================================== */

:root,
[data-theme="dark"] {
    color-scheme: dark;
    --bg: #070a12;
    --bg-elev: #0e1424;
    --bg-elev-2: #141c32;
    --bg-elev-3: #1a2542;
    --bg-code: #0b101c;
    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.16);
    --border-glow: rgba(99, 102, 241, 0.4);
    
    --text: #f1f5f9;
    --text-muted: #8e9cb5;
    --text-subtle: #5d6b82;
    --heading: #ffffff;

    --accent: #6366f1;
    --accent-strong: #818cf8;
    --accent-cyan: #06b6d4;
    --accent-violet: #8b5cf6;
    --accent-ink: #ffffff;
    --accent-soft: rgba(99, 102, 241, 0.12);
    --accent-glow: 0 0 24px rgba(99, 102, 241, 0.25);

    --success: #10b981;
    --success-soft: rgba(16, 185, 129, 0.12);
    --success-border: rgba(16, 185, 129, 0.28);

    --danger: #f43f5e;
    --danger-soft: rgba(244, 63, 94, 0.12);
    --danger-border: rgba(244, 63, 94, 0.28);

    --warn: #f59e0b;
    --warn-soft: rgba(245, 158, 11, 0.12);
    --warn-border: rgba(245, 158, 11, 0.28);

    --tip: #06b6d4;
    --tip-soft: rgba(6, 182, 212, 0.12);
    --tip-border: rgba(6, 182, 212, 0.28);

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.35);
    --shadow-md: 0 4px 16px -2px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 12px 36px -4px rgba(0, 0, 0, 0.65);
    --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.5), inset 0 1px 0 0 rgba(255, 255, 255, 0.05);
}

[data-theme="light"] {
    color-scheme: light;
    --bg: #f8fafc;
    --bg-elev: #ffffff;
    --bg-elev-2: #f1f5f9;
    --bg-elev-3: #e2e8f0;
    --bg-code: #0f172a;
    --border: #e2e8f0;
    --border-strong: #cbd5e1;
    --border-glow: rgba(79, 70, 229, 0.25);

    --text: #0f172a;
    --text-muted: #475569;
    --text-subtle: #94a3b8;
    --heading: #020617;

    --accent: #4f46e5;
    --accent-strong: #4338ca;
    --accent-cyan: #0284c7;
    --accent-violet: #7c3aed;
    --accent-ink: #ffffff;
    --accent-soft: rgba(79, 70, 229, 0.08);
    --accent-glow: 0 0 20px rgba(79, 70, 229, 0.15);

    --success: #059669;
    --success-soft: rgba(5, 150, 105, 0.08);
    --success-border: rgba(5, 150, 105, 0.25);

    --danger: #e11d48;
    --danger-soft: rgba(225, 29, 72, 0.08);
    --danger-border: rgba(225, 29, 72, 0.25);

    --warn: #d97706;
    --warn-soft: rgba(217, 119, 6, 0.08);
    --warn-border: rgba(217, 119, 6, 0.25);

    --tip: #0891b2;
    --tip-soft: rgba(8, 145, 178, 0.08);
    --tip-border: rgba(8, 145, 178, 0.25);

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 14px -2px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 28px -4px rgba(0, 0, 0, 0.12);
    --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.04), 0 1px 3px rgba(0, 0, 0, 0.02);
}

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

html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-behavior: smooth;
    scroll-padding-top: 5.5rem;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.68;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-wrap: break-word;
    letter-spacing: -0.01em;
    background-image: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.12), transparent);
    background-repeat: no-repeat;
    background-attachment: fixed;
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { transition: none !important; animation: none !important; }
}

::selection {
    background: var(--accent);
    color: var(--accent-ink);
}

img, svg, video { max-width: 100%; display: block; }

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.15s ease, opacity 0.15s ease;
}
a:hover {
    color: var(--accent-strong);
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 6px;
}

h1, h2, h3, h4, h5 {
    color: var(--heading);
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.025em;
    margin: 0 0 0.6em;
}

h1 { font-size: clamp(2rem, 1.4rem + 2.8vw, 3.25rem); font-weight: 800; letter-spacing: -0.035em; }
h2 { font-size: clamp(1.4rem, 1.15rem + 1.2vw, 2rem); letter-spacing: -0.025em; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.05rem; }

p, ul, ol, table, pre, blockquote, details, figure { margin: 0 0 1.25rem; }

code, kbd, pre, samp {
    font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.88em;
}

:not(pre) > code {
    background: var(--bg-elev-2);
    border: 1px solid var(--border);
    color: var(--accent-strong);
    border-radius: 6px;
    padding: 0.15em 0.42em;
    overflow-wrap: anywhere;
}
[data-theme="light"] :not(pre) > code {
    color: var(--accent);
}

kbd {
    background: var(--bg-elev-2);
    border: 1px solid var(--border-strong);
    border-bottom-width: 2px;
    border-radius: 6px;
    padding: 0.1em 0.45em;
}

pre {
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.15rem 1.25rem;
    overflow-x: auto;
    line-height: 1.6;
    -webkit-overflow-scrolling: touch;
    tab-size: 4;
    color: #e2e8f0;
    position: relative;
}

pre code { background: none; border: 0; padding: 0; font-size: 0.88rem; color: inherit; }

hr {
    border: 0;
    border-top: 1px solid var(--border);
    margin: 2.5rem 0;
}

.container {
    width: 100%;
    max-width: 980px;
    margin: 0 auto;
    padding-left: max(1.25rem, env(safe-area-inset-left));
    padding-right: max(1.25rem, env(safe-area-inset-right));
}

main.container {
    flex: 1;
    padding-top: 2rem;
    padding-bottom: 4rem;
}

.skip-link {
    position: absolute;
    left: -999px;
    top: 0.75rem;
    background: var(--accent);
    color: var(--accent-ink);
    padding: 0.6rem 1.1rem;
    border-radius: 8px;
    font-weight: 600;
    z-index: 100;
}
.skip-link:focus { left: 1rem; }

.muted { color: var(--text-muted); }

/* ---------- Reading Progress Bar ---------- */

.reading-progress-track {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    z-index: 100;
    background: transparent;
    pointer-events: none;
}

.reading-progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #6366f1, #3b82f6, #06b6d4);
    transition: width 0.1s linear;
}

/* ---------- Header & Brand ---------- */

.site-header {
    position: sticky;
    top: 0;
    z-index: 60;
    background: color-mix(in srgb, var(--bg) 82%, transparent);
    backdrop-filter: blur(16px) saturate(160%);
    -webkit-backdrop-filter: blur(16px) saturate(160%);
    border-bottom: 1px solid var(--border);
    padding-top: env(safe-area-inset-top);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    min-height: 4rem;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--heading);
    text-decoration: none;
}

.brand-mark {
    display: inline-grid;
    place-items: center;
    height: 2.25rem;
    padding: 0 0.65rem;
    border-radius: 10px;
    background: linear-gradient(135deg, #6366f1 0%, #3b82f6 50%, #06b6d4 100%);
    color: #ffffff;
    font-size: 0.82rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    box-shadow: 0 2px 10px rgba(99, 102, 241, 0.35);
}

.brand-info {
    display: flex;
    flex-direction: column;
}

.brand-title {
    font-weight: 750;
    font-size: 1.05rem;
    color: var(--heading);
    line-height: 1.2;
}

.brand-sub {
    font-size: 0.76rem;
    color: var(--text-muted);
    font-weight: 500;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    padding: 0.45rem 0.8rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-muted);
    transition: all 0.15s ease;
}
.nav-link:hover {
    color: var(--heading);
    background: var(--bg-elev-2);
}
.nav-link-active {
    color: var(--accent);
    background: var(--accent-soft);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    min-height: 2.35rem;
    padding: 0 0.85rem;
    border-radius: 999px;
    border: 1px solid var(--border-strong);
    background: var(--bg-elev);
    color: var(--text);
    font: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}
.theme-toggle:hover {
    border-color: var(--accent);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}
.theme-toggle svg {
    width: 1.05rem;
    height: 1.05rem;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}
.theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: inline; }

/* ---------- Buttons & Badges ---------- */

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-height: 2.75rem;
    padding: 0.6rem 1.25rem;
    border-radius: 11px;
    border: 1px solid var(--border-strong);
    background: var(--bg-elev);
    color: var(--text);
    font: inherit;
    font-size: 0.95rem;
    font-weight: 650;
    text-decoration: none;
    cursor: pointer;
    text-align: center;
    transition: all 0.18s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: var(--shadow-sm);
}
.button:hover {
    border-color: var(--accent);
    color: var(--heading);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}
.button:active {
    transform: translateY(0);
}

.button-primary {
    background: linear-gradient(135deg, #6366f1, #4f46e5);
    border-color: transparent;
    color: #ffffff !important;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
}
.button-primary:hover {
    background: linear-gradient(135deg, #818cf8, #6366f1);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.45);
}

.button-secondary {
    background: var(--bg-elev-2);
    border-color: var(--border-strong);
    color: var(--text);
}
.button-secondary:hover {
    background: var(--bg-elev-3);
    border-color: var(--accent);
}

.button-lg {
    min-height: 3.25rem;
    padding: 0.75rem 1.6rem;
    font-size: 1.02rem;
    border-radius: 12px;
}

.button-subtle {
    background: transparent;
    border-color: var(--border);
    color: var(--text-muted);
}
.button-subtle:hover {
    background: var(--bg-elev-2);
    color: var(--heading);
}

.btn-subtle {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    font: inherit;
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.3rem 0.65rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s ease;
}
.btn-subtle:hover {
    color: var(--heading);
    border-color: var(--border-strong);
    background: var(--bg-elev-2);
}

.badge, .tag {
    display: inline-flex;
    align-items: center;
    font-size: 0.74rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--accent);
    background: var(--accent-soft);
    border: 1px solid rgba(99, 102, 241, 0.25);
    border-radius: 999px;
    padding: 0.2em 0.7em;
    line-height: 1.3;
}
.badge-indigo { color: var(--accent); background: var(--accent-soft); border-color: rgba(99, 102, 241, 0.25); }
.badge-cyan { color: var(--accent-cyan); background: var(--tip-soft); border-color: var(--tip-border); }
.badge-amber { color: var(--warn); background: var(--warn-soft); border-color: var(--warn-border); }
.badge-rose { color: var(--danger); background: var(--danger-soft); border-color: var(--danger-border); }
.badge-emerald { color: var(--success); background: var(--success-soft); border-color: var(--success-border); }
.badge-danger { color: var(--danger); background: var(--danger-soft); border-color: var(--danger-border); }

/* ---------- Home Page Hero & Command Center ---------- */

.hero {
    padding: 2.5rem 0 1.5rem;
    text-align: center;
    max-width: 860px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.35rem 0.95rem;
    border-radius: 999px;
    background: var(--bg-elev);
    border: 1px solid var(--border-strong);
    color: var(--accent-strong);
    font-size: 0.82rem;
    font-weight: 650;
    letter-spacing: 0.02em;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.pulse-dot {
    width: 0.55rem;
    height: 0.55rem;
    border-radius: 50%;
    background: var(--accent-cyan);
    box-shadow: 0 0 10px var(--accent-cyan);
    animation: pulseGlow 2s infinite;
}

@keyframes pulseGlow {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.4; transform: scale(0.85); }
}

.hero-title {
    margin-bottom: 1.25rem;
    line-height: 1.15;
}

.gradient-text {
    background: linear-gradient(135deg, #ffffff 40%, #cbd5e1 75%, #818cf8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
[data-theme="light"] .gradient-text {
    background: linear-gradient(135deg, #090d16 45%, #4f46e5 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.lead {
    font-size: 1.15rem;
    line-height: 1.7;
    color: var(--text-muted);
    max-width: 760px;
    margin: 0 auto 2.25rem;
}

.hero-command-card {
    background: var(--bg-elev);
    border: 1px solid var(--border-strong);
    border-radius: 20px;
    padding: 1.75rem 2rem;
    box-shadow: var(--shadow-card);
    text-align: left;
    margin-top: 1rem;
    position: relative;
    overflow: hidden;
}

.hero-command-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, #6366f1, #3b82f6, #06b6d4);
}

.command-card-header {
    display: flex;
    align-items: center;
    justify-content: space-around;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1.25rem;
}

.command-card-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}
.stat-num {
    font-size: 2rem;
    font-weight: 800;
    color: var(--heading);
    line-height: 1.1;
    font-variant-numeric: tabular-nums;
}
.stat-slash {
    font-size: 1.2rem;
    color: var(--text-subtle);
    margin: 0 0.15rem;
}
.stat-total {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-muted);
}
.stat-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.command-card-divider {
    width: 1px;
    height: 2.75rem;
    background: var(--border);
}

.hero-progress {
    margin: 1.25rem 0 1.75rem;
}

.progress-bar {
    height: 0.65rem;
    border-radius: 999px;
    background: var(--bg-elev-2);
    border: 1px solid var(--border);
    overflow: hidden;
    position: relative;
}
.progress-bar span {
    display: block;
    height: 100%;
    background: linear-gradient(90deg, #6366f1, #3b82f6, #06b6d4);
    border-radius: inherit;
    transition: width 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.command-card-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ---------- Stats Grid ---------- */

.stats-section {
    margin: 2.5rem 0 3.5rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
}

.stat-card {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.25rem 1.4rem;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}
.stat-card:hover {
    border-color: var(--border-strong);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-icon-wrap {
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 12px;
    display: grid;
    place-items: center;
    flex-shrink: 0;
}
.stat-icon-wrap svg { width: 1.35rem; height: 1.35rem; }

.stat-icon-indigo { background: rgba(99, 102, 241, 0.12); color: #818cf8; border: 1px solid rgba(99, 102, 241, 0.25); }
.stat-icon-cyan { background: rgba(6, 182, 212, 0.12); color: #22d3ee; border: 1px solid rgba(6, 182, 212, 0.25); }
.stat-icon-violet { background: rgba(139, 92, 246, 0.12); color: #c084fc; border: 1px solid rgba(139, 92, 246, 0.25); }
.stat-icon-amber { background: rgba(245, 158, 11, 0.12); color: #fbbf24; border: 1px solid rgba(245, 158, 11, 0.25); }
.stat-icon-emerald { background: rgba(16, 185, 129, 0.12); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.25); }
.stat-icon-rose { background: rgba(244, 63, 94, 0.12); color: #fb7185; border: 1px solid rgba(244, 63, 94, 0.25); }

.stat-body strong {
    display: block;
    font-size: 1.45rem;
    color: var(--heading);
    line-height: 1.2;
    margin-bottom: 0.2rem;
}
.stat-body span {
    color: var(--text-muted);
    font-size: 0.88rem;
    line-height: 1.4;
}

/* ---------- Section Headers ---------- */

.section {
    margin: 4rem 0;
}

.section-header {
    margin-bottom: 2rem;
}

.section-tag {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-muted);
    margin: 0;
}

/* ---------- Methodology Grid ---------- */

.methodology-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
}

.method-card {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 1.6rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
}
.method-card:hover {
    border-color: var(--border-strong);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.method-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.method-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--text-subtle);
}

.method-card h3 {
    margin-bottom: 0.6rem;
    font-size: 1.2rem;
}
.method-card p {
    color: var(--text-muted);
    font-size: 0.94rem;
    line-height: 1.6;
    margin-bottom: 0;
}

/* ---------- Weekly Schedule Card ---------- */

.schedule-card {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 1.75rem;
    box-shadow: var(--shadow-card);
}

.schedule-visual-bar {
    display: flex;
    height: 0.65rem;
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: 1.75rem;
    background: var(--bg-elev-2);
}
.bar-recall { background: #38bdf8; }
.bar-concept { background: #818cf8; }
.bar-build { background: #34d399; }
.bar-drill { background: #fbbf24; }
.bar-job { background: #f472b6; }

.schedule-table th, .schedule-table td {
    padding: 0.75rem 1rem;
}

.dot {
    display: inline-block;
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    margin-right: 0.4rem;
    vertical-align: middle;
}
.dot-recall { background: #38bdf8; }
.dot-concept { background: #818cf8; }
.dot-build { background: #34d399; }
.dot-drill { background: #fbbf24; }
.dot-fde { background: #a78bfa; }
.dot-job { background: #f472b6; }
.dot-gate { background: #fb7185; }

.schedule-footer-note {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 1.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
}
.rule-chip {
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--warn-soft);
    color: var(--warn);
    border: 1px solid var(--warn-border);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
}
.schedule-footer-note p { margin: 0; font-size: 0.92rem; color: var(--text-muted); }

/* ---------- Capstone Showcase ---------- */

.capstone-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.capstone-card {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
    transition: all 0.2s ease;
}
.capstone-card:hover {
    border-color: var(--border-strong);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.capstone-pill {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 750;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.3rem 0.8rem;
    border-radius: 999px;
    margin-bottom: 1.1rem;
}
.capstone-v1 { background: rgba(56, 189, 248, 0.12); color: #38bdf8; border: 1px solid rgba(56, 189, 248, 0.25); }
.capstone-v2 { background: rgba(168, 85, 247, 0.12); color: #c084fc; border: 1px solid rgba(168, 85, 247, 0.25); }

.capstone-card h3 { font-size: 1.35rem; margin-bottom: 0.75rem; }
.capstone-card p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.65; margin-bottom: 1.5rem; }

.capstone-specs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}

.spec-tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.76rem;
    font-weight: 600;
    padding: 0.25rem 0.6rem;
    border-radius: 6px;
    background: var(--bg-elev-2);
    border: 1px solid var(--border);
    color: var(--text-muted);
}

/* ---------- Curriculum Toolbar & Weeks Accordion ---------- */

.curriculum-header-row {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.accordion-controls {
    display: flex;
    gap: 0.5rem;
}

.curriculum-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
    padding: 0.85rem 1.1rem;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 14px;
}

.search-input-wrap {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    flex: 1 1 260px;
}
.search-icon {
    width: 1.15rem;
    height: 1.15rem;
    color: var(--text-subtle);
    flex-shrink: 0;
}
#day-search {
    width: 100%;
    background: transparent;
    border: 0;
    color: var(--text);
    font: inherit;
    font-size: 0.92rem;
    outline: none;
}
#day-search::placeholder {
    color: var(--text-subtle);
}

.filter-pills {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    flex-wrap: wrap;
}

.filter-pill {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    font: inherit;
    font-size: 0.82rem;
    font-weight: 600;
    padding: 0.3rem 0.75rem;
    border-radius: 999px;
    cursor: pointer;
    transition: all 0.15s ease;
}
.filter-pill:hover {
    color: var(--heading);
    background: var(--bg-elev-2);
}
.filter-pill.is-active {
    background: var(--accent-soft);
    border-color: rgba(99, 102, 241, 0.3);
    color: var(--accent);
}

.weeks-container {
    display: grid;
    gap: 1rem;
}

.week-card {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 18px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: border-color 0.2s ease;
}
.week-card:hover {
    border-color: var(--border-strong);
}

.week-summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.15rem 1.4rem;
    cursor: pointer;
    list-style: none;
    min-height: 3.75rem;
}
.week-summary::-webkit-details-marker { display: none; }

.week-header-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.week-badge {
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--accent);
    background: var(--accent-soft);
    padding: 0.2rem 0.65rem;
    border-radius: 6px;
    border: 1px solid rgba(99, 102, 241, 0.25);
    white-space: nowrap;
}

.level-badge {
    font-size: 0.72rem;
    font-weight: 750;
    text-transform: uppercase;
    background: var(--bg-elev-2);
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 0.18rem 0.5rem;
    border-radius: 5px;
}

.week-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--heading);
    margin: 0;
}

.week-summary-meta {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    flex-shrink: 0;
}

.week-progress-pill {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    background: var(--bg-elev-2);
    padding: 0.25rem 0.7rem;
    border-radius: 999px;
    border: 1px solid var(--border);
    font-variant-numeric: tabular-nums;
}
.week-progress-pill.has-published {
    background: var(--success-soft);
    border-color: var(--success-border);
    color: var(--success);
}

.chevron-icon {
    display: grid;
    place-items: center;
    color: var(--text-muted);
    transition: transform 0.2s ease;
}
.week-card[open] .chevron-icon {
    transform: rotate(180deg);
}

.week-content {
    padding: 0 1.4rem 1.4rem;
    border-top: 1px solid var(--border);
    padding-top: 1.25rem;
}

.week-objective {
    font-size: 0.94rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 1.25rem;
}

.week-meta-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-bottom: 1.5rem;
}

.meta-chip {
    display: inline-flex;
    flex-direction: column;
    padding: 0.5rem 0.85rem;
    background: var(--bg-elev-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 0.82rem;
}
.meta-label {
    font-size: 0.68rem;
    font-weight: 750;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-subtle);
    margin-bottom: 0.15rem;
}
.meta-chip strong {
    color: var(--heading);
    font-weight: 650;
}

.chip-amber { background: var(--warn-soft); border-color: var(--warn-border); }
.chip-amber .meta-label { color: var(--warn); }
.chip-rose { background: var(--danger-soft); border-color: var(--danger-border); }
.chip-rose .meta-label { color: var(--danger); }

.day-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 0.55rem;
}

.day-item.is-hidden {
    display: none !important;
}

.day-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.75rem 1rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    text-decoration: none;
    color: var(--text);
    transition: all 0.18s ease;
}

.day-row.is-open {
    background: var(--bg-elev-2);
}
.day-row.is-open:hover {
    border-color: var(--accent);
    background: var(--bg-elev-3);
    transform: translateX(3px);
    box-shadow: var(--shadow-sm);
}

.day-row.is-locked {
    opacity: 0.65;
    background: transparent;
    border-style: dashed;
}

.day-badge-col {
    flex-shrink: 0;
}

.day-num {
    display: grid;
    place-items: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 10px;
    background: var(--bg);
    border: 1px solid var(--border);
    font-weight: 750;
    font-size: 0.95rem;
    font-variant-numeric: tabular-nums;
    color: var(--text-muted);
}
.is-open .day-num {
    background: linear-gradient(135deg, #6366f1, #3b82f6);
    color: #ffffff;
    border-color: transparent;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.day-info-col {
    flex: 1;
    min-width: 0;
}

.day-title {
    display: block;
    font-weight: 650;
    font-size: 0.98rem;
    color: var(--heading);
    line-height: 1.35;
    margin-bottom: 0.2rem;
}

.day-submeta {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    flex-wrap: wrap;
}

.day-date {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.status-pill {
    font-size: 0.68rem;
    font-weight: 750;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.12rem 0.5rem;
    border-radius: 999px;
}
.status-ready {
    background: var(--success-soft);
    color: var(--success);
    border: 1px solid var(--success-border);
}
.status-locked {
    background: var(--bg-elev);
    color: var(--text-subtle);
    border: 1px solid var(--border);
}

.day-action-col {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    flex-shrink: 0;
}

.day-score {
    font-size: 0.82rem;
    font-weight: 750;
    color: var(--success);
    background: var(--success-soft);
    border: 1px solid var(--success-border);
    padding: 0.2rem 0.65rem;
    border-radius: 999px;
    white-space: nowrap;
}

.open-link-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.85rem;
    font-weight: 650;
    color: var(--accent);
}

.lock-icon {
    color: var(--text-subtle);
}

/* ---------- Rules Grid ---------- */

.rules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
}

.rule-card {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}
.rule-card:hover {
    border-color: var(--border-strong);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.rule-icon-box {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.rule-card h3 {
    font-size: 1.15rem;
    margin-bottom: 0.45rem;
}
.rule-card p {
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.55;
    margin: 0;
}

/* ==========================================================================
   Day Wise Lesson Page Styles
   ========================================================================== */

.breadcrumbs {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.88rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}
.breadcrumb-item {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--text-muted);
}
.breadcrumb-item:hover {
    color: var(--heading);
}
.breadcrumb-separator {
    color: var(--text-subtle);
}
.breadcrumb-current {
    color: var(--accent);
    font-weight: 600;
}

.day-hero {
    margin-bottom: 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.day-hero-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-bottom: 1.1rem;
}

.day-chip {
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--accent);
    color: #ffffff;
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
}
.week-chip {
    font-size: 0.8rem;
    font-weight: 650;
    color: var(--text-muted);
    background: var(--bg-elev-2);
    border: 1px solid var(--border);
    padding: 0.22rem 0.7rem;
    border-radius: 999px;
}
.date-chip, .time-estimate-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.8rem;
    color: var(--text-subtle);
    background: var(--bg-elev);
    border: 1px solid var(--border);
    padding: 0.22rem 0.7rem;
    border-radius: 999px;
}

.day-main-title {
    font-size: clamp(2rem, 1.5rem + 2.5vw, 3rem);
    margin-bottom: 1rem;
    line-height: 1.18;
}

.day-main-lead {
    font-size: 1.15rem;
    line-height: 1.7;
    color: var(--text-muted);
    max-width: 820px;
    margin-bottom: 1.75rem;
}

/* ---------- Quick Jump Lesson Nav Bar ---------- */

.lesson-jump-nav {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 14px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.jump-nav-label {
    font-size: 0.76rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-subtle);
    white-space: nowrap;
}

.jump-nav-links {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.jump-link {
    display: inline-block;
    font-size: 0.84rem;
    font-weight: 600;
    color: var(--text-muted);
    padding: 0.3rem 0.7rem;
    border-radius: 8px;
    white-space: nowrap;
    transition: all 0.15s ease;
}
.jump-link:hover {
    color: var(--heading);
    background: var(--bg-elev-2);
}
.jump-link.is-active {
    color: var(--accent);
    background: var(--accent-soft);
}
.jump-link-quiz {
    color: var(--accent-cyan);
    font-weight: 700;
}

/* ---------- Lesson Content Body ---------- */

.lesson {
    line-height: 1.72;
}

.lesson h2 {
    margin-top: 3.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}
.lesson section:first-child h2 {
    margin-top: 0;
    padding-top: 0;
    border-top: 0;
}

.lesson h3 {
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.lesson ul, .lesson ol {
    padding-left: 1.5rem;
}
.lesson li {
    margin-bottom: 0.45rem;
}

.lesson blockquote {
    margin-left: 0;
    padding: 0.75rem 1.25rem;
    border-left: 4px solid var(--accent);
    background: var(--accent-soft);
    border-radius: 0 10px 10px 0;
    color: var(--text);
    font-style: italic;
}

/* ---------- Timebox Grid ---------- */

.timebox {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 0.75rem;
    list-style: none;
    padding: 0 !important;
    margin: 1.5rem 0 2rem;
}
.timebox li {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.85rem 1rem;
    margin: 0;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
}
.timebox strong {
    display: block;
    font-size: 0.95rem;
    color: var(--heading);
    margin-bottom: 0.25rem;
}
.timebox span {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.84rem;
    font-weight: 600;
    color: var(--accent-strong);
}

/* ---------- Tables ---------- */

.table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border: 1px solid var(--border);
    border-radius: 14px;
    margin: 1.5rem 0;
    background: var(--bg-elev);
    box-shadow: var(--shadow-sm);
}
.table-wrap table { margin: 0; }

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
}
th, td {
    text-align: left;
    vertical-align: top;
    padding: 0.8rem 1rem;
    border-bottom: 1px solid var(--border);
}
th {
    color: var(--heading);
    background: var(--bg-elev-2);
    font-weight: 700;
    letter-spacing: -0.01em;
    white-space: nowrap;
}
tr:last-child td { border-bottom: 0; }
tr:hover td {
    background: color-mix(in srgb, var(--bg-elev-2) 40%, transparent);
}

/* ---------- Callout Boxes ---------- */

.callout {
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent);
    background: var(--accent-soft);
    border-radius: 12px;
    padding: 1.1rem 1.35rem;
    margin: 1.5rem 0;
    box-shadow: var(--shadow-sm);
}
.callout > :last-child { margin-bottom: 0; }
.callout-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 750;
    font-size: 1.02rem;
    color: var(--heading);
    margin-bottom: 0.45rem;
}

.callout-tip { border-left-color: var(--tip); background: var(--tip-soft); border-color: var(--tip-border); }
.callout-warn { border-left-color: var(--warn); background: var(--warn-soft); border-color: var(--warn-border); }
.callout-danger { border-left-color: var(--danger); background: var(--danger-soft); border-color: var(--danger-border); }
.callout-success { border-left-color: var(--success); background: var(--success-soft); border-color: var(--success-border); }

/* ---------- Step-by-Step Builds ---------- */

.steps {
    counter-reset: step;
    list-style: none;
    padding-left: 0 !important;
    position: relative;
    margin: 2rem 0;
}
.steps > li {
    counter-increment: step;
    position: relative;
    padding: 0.2rem 0 1.5rem 3.25rem;
    margin: 0;
}
.steps > li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 2.2rem;
    height: 2.2rem;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: linear-gradient(135deg, #6366f1, #3b82f6);
    color: #ffffff;
    font-size: 0.9rem;
    font-weight: 800;
    box-shadow: 0 2px 10px rgba(99, 102, 241, 0.35);
    z-index: 2;
}
.steps > li:not(:last-child)::after {
    content: "";
    position: absolute;
    left: 1.05rem;
    top: 2.2rem;
    bottom: 0;
    width: 2px;
    background: var(--border-strong);
}

/* ---------- Checklists ---------- */

.checklist {
    list-style: none;
    padding-left: 0 !important;
    margin: 1.5rem 0;
}
.checklist > li {
    position: relative;
    padding-left: 2rem;
    margin-bottom: 0.75rem;
    line-height: 1.55;
}
.checklist > li::before {
    content: "✓";
    position: absolute;
    left: 0.1rem;
    top: 0.15rem;
    width: 1.25rem;
    height: 1.25rem;
    display: grid;
    place-items: center;
    border: 1px solid var(--success-border);
    background: var(--success-soft);
    color: var(--success);
    border-radius: 6px;
    font-size: 0.78rem;
    font-weight: 900;
}

/* ---------- Details / Accordions in Lessons ---------- */

.lesson details {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0 1.25rem;
    margin-bottom: 0.85rem;
    box-shadow: var(--shadow-sm);
    transition: border-color 0.15s ease;
}
.lesson details:hover {
    border-color: var(--border-strong);
}
.lesson details > summary {
    cursor: pointer;
    font-weight: 650;
    color: var(--heading);
    padding: 0.9rem 0;
    min-height: 3rem;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.lesson details > summary::-webkit-details-marker { display: none; }
.lesson details > summary::after {
    content: "Reveal Answer ↓";
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--accent);
    background: var(--accent-soft);
    padding: 0.2rem 0.6rem;
    border-radius: 6px;
}
.lesson details[open] > summary::after {
    content: "Hide Answer ↑";
    color: var(--text-muted);
    background: var(--bg-elev-2);
}
.lesson details[open] > summary {
    border-bottom: 1px solid var(--border);
    margin-bottom: 1rem;
}
.lesson details > :last-child { margin-bottom: 1.25rem; }

/* ---------- Diagrams ---------- */

.diagram {
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.25rem;
    overflow-x: auto;
    white-space: pre;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.84rem;
    line-height: 1.5;
    color: #e2e8f0;
}

/* ---------- Code Blocks with Enhanced Header & Copy Button ---------- */

.code-block-wrapper {
    position: relative;
    margin: 1.5rem 0;
    border-radius: 14px;
    border: 1px solid var(--border-strong);
    background: var(--bg-code);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.code-block-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.55rem 1rem;
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid var(--border);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.78rem;
}

.code-window-dots {
    display: flex;
    gap: 0.35rem;
}
.dot-red { width: 0.65rem; height: 0.65rem; border-radius: 50%; background: #ef4444; }
.dot-yellow { width: 0.65rem; height: 0.65rem; border-radius: 50%; background: #eab308; }
.dot-green { width: 0.65rem; height: 0.65rem; border-radius: 50%; background: #22c55e; }

.code-lang-tag {
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #94a3b8;
}

.copy-code-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: #cbd5e1;
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.65rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s ease;
}
.copy-code-btn:hover {
    background: rgba(255, 255, 255, 0.16);
    color: #ffffff;
}
.copy-code-btn.is-copied {
    background: rgba(16, 185, 129, 0.25);
    border-color: #10b981;
    color: #34d399;
}

.code-block-wrapper pre {
    border: 0;
    border-radius: 0;
    margin: 0;
    background: transparent;
}

/* ---------- Drill Timer Widget ---------- */

.drill-timer-widget {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    margin: 1.5rem 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    flex-wrap: wrap;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}
.drill-timer-widget::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--warn);
}

.timer-info-col {
    display: flex;
    flex-direction: column;
}
.timer-title {
    font-weight: 750;
    font-size: 1.05rem;
    color: var(--heading);
    margin-bottom: 0.2rem;
}
.timer-subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.timer-clock-col {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}
.timer-digits {
    font-family: 'JetBrains Mono', monospace;
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--warn);
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums;
}
.timer-controls {
    display: flex;
    gap: 0.4rem;
}
.timer-btn {
    background: var(--bg-elev-2);
    border: 1px solid var(--border-strong);
    color: var(--text);
    font: inherit;
    font-size: 0.85rem;
    font-weight: 650;
    padding: 0.45rem 0.9rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s ease;
}
.timer-btn:hover {
    background: var(--bg-elev-3);
    border-color: var(--accent);
}
.timer-btn-start {
    background: var(--accent);
    color: #ffffff;
    border-color: transparent;
}
.timer-btn-start:hover {
    background: var(--accent-strong);
}

/* ---------- Knowledge Check (Quiz) ---------- */

.quiz {
    margin-top: 4.5rem;
    padding: 2.25rem;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 24px;
    box-shadow: var(--shadow-card);
    position: relative;
}

.quiz-head {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.quiz-title-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 0.5rem;
}

.quiz-badge {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--accent);
    background: var(--accent-soft);
    padding: 0.15rem 0.6rem;
    border-radius: 999px;
    margin-bottom: 0.35rem;
}

.quiz-head h2 {
    margin: 0;
    font-size: 1.85rem;
}

.quiz-stats-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.quiz-count {
    font-size: 0.84rem;
    font-weight: 750;
    color: var(--heading);
    background: var(--bg-elev-2);
    border: 1px solid var(--border);
    padding: 0.3rem 0.75rem;
    border-radius: 8px;
}
.quiz-type-note {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.quiz-subtitle {
    font-size: 0.96rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin: 0 0 1.25rem;
}

.quiz-meta-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.quiz-progress-indicator {
    flex: 1 1 240px;
}
.progress-indicator-text {
    display: block;
    font-size: 0.84rem;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}
.progress-indicator-text strong {
    color: var(--accent-strong);
}
.quiz-progress-track {
    height: 0.45rem;
    border-radius: 999px;
    background: var(--bg-elev-2);
    border: 1px solid var(--border);
    overflow: hidden;
}
.quiz-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #6366f1, #06b6d4);
    border-radius: inherit;
    transition: width 0.25s ease;
}

.quiz-history-pill {
    font-size: 0.82rem;
    font-weight: 650;
    color: var(--text);
    background: var(--bg-elev-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.4rem 0.85rem;
}

.quiz-questions {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 1.25rem;
    counter-reset: question;
}

.question {
    counter-increment: question;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.35rem 1.5rem;
    background: var(--bg);
    transition: all 0.2s ease;
}
.question:hover {
    border-color: var(--border-strong);
}

.question fieldset {
    border: 0;
    padding: 0;
    margin: 0;
    min-width: 0;
}

.question legend {
    padding: 0;
    margin-bottom: 1rem;
    font-weight: 650;
    font-size: 1.05rem;
    color: var(--heading);
    width: 100%;
    line-height: 1.45;
}
.question legend::before {
    content: counter(question) ". ";
    color: var(--accent);
    font-weight: 800;
}

.question-type {
    display: inline-block;
    font-size: 0.68rem;
    font-weight: 750;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--text-subtle);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.1rem 0.55rem;
    margin-left: 0.5rem;
    vertical-align: middle;
}

.options {
    display: grid;
    gap: 0.6rem;
}
.options-tf {
    grid-template-columns: 1fr 1fr;
}

.option {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.85rem 1rem;
    min-height: 3.1rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--bg-elev);
    cursor: pointer;
    line-height: 1.5;
    transition: all 0.15s ease;
}
.option:hover {
    border-color: var(--border-strong);
    background: var(--bg-elev-2);
}
.option input {
    margin: 0.25rem 0 0;
    width: 1.15rem;
    height: 1.15rem;
    flex: none;
    accent-color: var(--accent);
    cursor: pointer;
}
.option:has(input:checked) {
    border-color: var(--accent);
    background: var(--accent-soft);
    box-shadow: 0 0 0 1px var(--accent);
}

.option.is-correct {
    border-color: var(--success) !important;
    background: var(--success-soft) !important;
    box-shadow: 0 0 0 1px var(--success) !important;
}
.option.is-wrong {
    border-color: var(--danger) !important;
    background: var(--danger-soft) !important;
    box-shadow: 0 0 0 1px var(--danger) !important;
}

.quiz-form.is-graded .option {
    cursor: default;
}

.question.is-correct {
    border-color: var(--success);
}
.question.is-wrong, .question.is-unanswered {
    border-color: var(--danger);
}

.feedback {
    margin-top: 1rem;
    font-size: 0.94rem;
    border-radius: 10px;
    padding: 0.85rem 1rem;
    line-height: 1.55;
}
.feedback strong {
    display: block;
    margin-bottom: 0.2rem;
    font-weight: 750;
}
.feedback.is-correct {
    background: var(--success-soft);
    border: 1px solid var(--success-border);
}
.feedback.is-correct strong { color: var(--success); }
.feedback.is-wrong {
    background: var(--danger-soft);
    border: 1px solid var(--danger-border);
}
.feedback.is-wrong strong { color: var(--danger); }
.feedback p { margin: 0; }

.quiz-result {
    margin-top: 2rem;
    padding: 1.5rem;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: var(--bg-elev-2);
    box-shadow: var(--shadow-sm);
}
.quiz-result strong {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--heading);
    display: block;
    margin-bottom: 0.35rem;
}
.quiz-result p {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.98rem;
    line-height: 1.6;
}
.quiz-result.is-pass {
    border-color: var(--success);
    background: var(--success-soft);
}
.quiz-result.is-pass strong { color: var(--success); }
.quiz-result.is-fail {
    border-color: var(--warn);
    background: var(--warn-soft);
}
.quiz-result.is-fail strong { color: var(--warn); }
.quiz-result.is-incomplete {
    border-color: var(--danger);
    background: var(--danger-soft);
}
.quiz-result.is-incomplete strong { color: var(--danger); }

.quiz-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.85rem;
    margin-top: 2rem;
}

/* ---------- Pager Cards ---------- */

.pager {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1rem;
    margin-top: 3.5rem;
}

.pager-card {
    display: flex;
    flex-direction: column;
    padding: 1rem 1.25rem;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--bg-elev);
    text-decoration: none;
    min-height: 4.5rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}
.pager-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.pager-direction {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--text-muted);
    font-size: 0.76rem;
    font-weight: 750;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.pager-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--heading);
}

.pager-home { text-align: center; align-items: center; }
.pager-next { text-align: right; align-items: flex-end; }

.pager-card.is-disabled {
    opacity: 0.5;
    cursor: not-allowed;
}
.pager-card.is-disabled:hover {
    transform: none;
    border-color: var(--border);
    box-shadow: var(--shadow-sm);
}

/* ---------- Site Footer ---------- */

.site-footer {
    border-top: 1px solid var(--border);
    background: color-mix(in srgb, var(--bg-elev) 60%, transparent);
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: auto;
    padding: 3rem 0 calc(2rem + env(safe-area-inset-bottom));
}

.footer-inner {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 2.5rem;
    margin-bottom: 2rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}
.footer-logo strong {
    color: var(--heading);
    font-size: 1.05rem;
}

.footer-desc {
    color: var(--text-muted);
    font-size: 0.88rem;
    line-height: 1.6;
    margin: 0;
}

.footer-meta-badge {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-cyan);
    background: var(--tip-soft);
    border: 1px solid var(--tip-border);
    padding: 0.15rem 0.6rem;
    border-radius: 999px;
    margin-bottom: 0.5rem;
}

.footer-notes p {
    margin: 0;
    font-size: 0.84rem;
    line-height: 1.55;
    color: var(--text-subtle);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    font-size: 0.82rem;
    color: var(--text-subtle);
}

.back-to-top {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--text-muted);
    font-weight: 600;
}
.back-to-top:hover {
    color: var(--heading);
}

/* ---------- Responsive Breakpoints ---------- */

@media (max-width: 639px) {
    .header-nav { display: none; }
    .brand-sub { display: none; }
    .command-card-divider { display: none; }
    .command-card-header { gap: 1.25rem; }
    .options-tf { grid-template-columns: 1fr; }
    .pager { grid-template-columns: 1fr; }
    .pager-home { order: 2; }
    .pager-next { align-items: flex-start; text-align: left; }
    .footer-inner { grid-template-columns: 1fr; gap: 1.5rem; }
    .hero-command-card { padding: 1.25rem; }
    .quiz { padding: 1.25rem; }
}

@media (min-width: 640px) and (max-width: 899px) {
    .header-nav .nav-link:nth-child(n+3) { display: none; }
}