/* ============================================================
   NOTIONS PREMIUM — Shared styles for all notion pages
   Covers: notions-global, notions-index, notion-hub
   Design system: uses --cq-* tokens from design-system.css
   ============================================================ */

/* ── FOUNDATIONS ─────────────────────────────────────────── */

.notions-page {
    --notions-accent: var(--cq-primary, #6366f1);
    --notions-accent-light: var(--cq-primary-light, #818cf8);
    --notions-accent-dark: var(--cq-primary-dark, #4f46e5);
    --notions-glow: rgba(99, 102, 241, 0.15);
    --notions-glow-strong: rgba(99, 102, 241, 0.25);
    --notions-surface: #ffffff;
    --notions-surface-alt: #f8fafc;
    --notions-surface-elevated: #ffffff;
    --notions-border: rgba(148, 163, 184, 0.2);
    --notions-border-hover: rgba(99, 102, 241, 0.4);
    --notions-text: #0f172a;
    --notions-text-secondary: #64748b;
    --notions-text-muted: #94a3b8;
    --notions-card-shadow: 0 1px 3px rgba(15, 23, 42, 0.04), 0 4px 12px rgba(15, 23, 42, 0.03);
    --notions-card-shadow-hover: 0 8px 30px rgba(99, 102, 241, 0.12), 0 2px 8px rgba(15, 23, 42, 0.06);
    --notions-radius: 16px;
    --notions-radius-sm: 10px;
    --notions-radius-pill: 999px;
    --notions-transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

body.qcm-dark .notions-page,
[data-theme="dark"] .notions-page {
    --notions-surface: #0f172a;
    --notions-surface-alt: #111827;
    --notions-surface-elevated: #1e293b;
    --notions-border: rgba(100, 116, 139, 0.25);
    --notions-border-hover: rgba(129, 140, 248, 0.5);
    --notions-text: #f1f5f9;
    --notions-text-secondary: #94a3b8;
    --notions-text-muted: #64748b;
    --notions-card-shadow: 0 1px 3px rgba(0, 0, 0, 0.2), 0 4px 12px rgba(0, 0, 0, 0.15);
    --notions-card-shadow-hover: 0 8px 30px rgba(99, 102, 241, 0.2), 0 2px 8px rgba(0, 0, 0, 0.2);
    --notions-glow: rgba(129, 140, 248, 0.12);
    --notions-glow-strong: rgba(129, 140, 248, 0.2);
}

/* ── SCROLL REVEAL ──────────────────────────────────────── */

.notions-reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.notions-reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.notions-reveal-stagger > * {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.notions-reveal-stagger.is-visible > *:nth-child(1) { transition-delay: 0ms; }
.notions-reveal-stagger.is-visible > *:nth-child(2) { transition-delay: 60ms; }
.notions-reveal-stagger.is-visible > *:nth-child(3) { transition-delay: 120ms; }
.notions-reveal-stagger.is-visible > *:nth-child(4) { transition-delay: 180ms; }
.notions-reveal-stagger.is-visible > *:nth-child(5) { transition-delay: 240ms; }
.notions-reveal-stagger.is-visible > *:nth-child(6) { transition-delay: 300ms; }
.notions-reveal-stagger.is-visible > *:nth-child(7) { transition-delay: 360ms; }
.notions-reveal-stagger.is-visible > *:nth-child(8) { transition-delay: 420ms; }
.notions-reveal-stagger.is-visible > *:nth-child(9) { transition-delay: 480ms; }

.notions-reveal-stagger.is-visible > * {
    opacity: 1;
    transform: translateY(0);
}

/* ── SECTION SPACING ────────────────────────────────────── */

.notions-section {
    margin-bottom: 3.5rem;
    padding: 0;
}

.notions-section__header {
    margin-bottom: 1.75rem;
}

.notions-section__title {
    font-size: clamp(1.25rem, 2.5vw, 1.65rem);
    font-weight: 800;
    color: var(--notions-text);
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin: 0 0 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.625rem;
}

.notions-section__title-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--notions-radius-sm);
    background: linear-gradient(135deg, var(--notions-accent), var(--notions-accent-light));
    color: #fff;
    font-size: 1rem;
    flex-shrink: 0;
    box-shadow: 0 2px 8px var(--notions-glow);
}

.notions-section__subtitle {
    font-size: 0.95rem;
    color: var(--notions-text-secondary);
    line-height: 1.6;
    margin: 0;
    max-width: 640px;
}

/* ── HERO NOTION OVERRIDE ───────────────────────────────── */

.qcm-hub-hero--notion {
    background: var(--cq-hero-gradient, linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%)) !important;
    color: white;
    padding: 64px 40px 56px;
    border-radius: var(--cq-hero-radius, 24px);
    margin-bottom: 2.5rem;
    box-shadow: 0 20px 60px rgba(99, 102, 241, 0.25), 0 8px 24px rgba(0, 0, 0, 0.08);
}

.qcm-hub-hero--notions-index,
.qcm-hub-hero--notions-global {
    margin-bottom: 2.5rem;
}

/* E-E-A-T badge row */
.notion-eeat-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-top: 1.25rem;
}

.notion-eeat-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 0.875rem;
    border-radius: var(--notions-radius-pill);
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.18);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    font-size: 0.8125rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.95);
    white-space: nowrap;
}

.notion-eeat-badge__icon {
    font-size: 0.875rem;
    opacity: 0.9;
}

/* Hero stats bar */
.notion-stats-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.notion-stat {
    text-align: center;
}

.notion-stat__value {
    display: block;
    font-size: 1.75rem;
    font-weight: 800;
    line-height: 1;
    color: #fff;
    letter-spacing: -0.02em;
}

.notion-stat__label {
    display: block;
    font-size: 0.75rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.75);
    margin-top: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* ── SECTION NAV (ANCHOR PILLS) ─────────────────────────── */

.notions-nav {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    padding: 1rem 1.25rem;
    border-radius: var(--notions-radius);
    background: var(--notions-surface-elevated);
    border: 1px solid var(--notions-border);
    box-shadow: var(--notions-card-shadow);
    margin-bottom: 2rem;
    position: sticky;
    top: 80px;
    z-index: 20;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.notions-nav__item {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 0.875rem;
    border-radius: var(--notions-radius-pill);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--notions-text-secondary);
    text-decoration: none;
    border: 1px solid transparent;
    background: transparent;
    transition: all var(--notions-transition);
    white-space: nowrap;
}

.notions-nav__item:hover,
.notions-nav__item.is-active {
    color: var(--notions-accent);
    background: var(--notions-glow);
    border-color: var(--notions-border-hover);
}

/* ── NOTION CARDS ────────────────────────────────────────── */

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

.notions-grid--compact {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}

.notions-grid--wide {
    grid-template-columns: repeat(3, 1fr);
}

.notion-card {
    display: flex;
    flex-direction: column;
    padding: 1.25rem 1.375rem;
    border-radius: var(--notions-radius);
    background: var(--notions-surface-elevated);
    border: 1px solid var(--notions-border);
    box-shadow: var(--notions-card-shadow);
    text-decoration: none;
    color: inherit;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1),
                box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1),
                border-color 0.3s ease;
    position: relative;
    overflow: hidden;
}

.notion-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--notions-accent), var(--notions-accent-light));
    opacity: 0.5;
    transition: opacity var(--notions-transition), height 0.3s ease;
}

.notion-card:hover {
    border-color: var(--notions-border-hover);
    box-shadow: var(--notions-card-shadow-hover), 0 0 0 1px var(--notions-glow);
    transform: translateY(-4px);
}

.notion-card:hover::before {
    opacity: 1;
    height: 3px;
}

.notion-card__title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--notions-text);
    margin: 0 0 0.5rem;
    line-height: 1.3;
    overflow-wrap: anywhere;
}

.notion-card__desc {
    font-size: 0.875rem;
    color: var(--notions-text-secondary);
    line-height: 1.55;
    margin: 0 0 0.75rem;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.notion-card__meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.8125rem;
    color: var(--notions-text-muted);
    margin-top: auto;
}

.notion-card__meta-item {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.notion-card__count {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--notions-accent);
}

.notion-card__arrow {
    margin-left: auto;
    font-size: 0.875rem;
    color: var(--notions-text-muted);
    transition: transform var(--notions-transition), color var(--notions-transition);
}

.notion-card:hover .notion-card__arrow {
    transform: translateX(3px);
    color: var(--notions-accent);
}

/* Card header row (step number + enriched badge) */
.notion-card__header-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.notion-card__step {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    font-size: 0.7rem;
    font-weight: 800;
    flex-shrink: 0;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--notions-accent), var(--notions-accent-light));
    color: #fff;
}

.notion-card__enriched-badge {
    font-size: 0.7rem;
    color: var(--notions-accent);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* Card footer (count + arrow) */
.notion-card__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
}

/* Card: "à enrichir" variant */
.notion-card--enrich {
    border-color: rgba(245, 158, 11, 0.25);
}

.notion-card--enrich::before {
    background: linear-gradient(90deg, #f59e0b, #fbbf24);
}

.notion-card--enrich .notion-card__count {
    color: #d97706;
}

/* Card: chapter variant */
.notion-card--chapter {
    padding: 1.5rem;
}

/* ── ALPHABET NAV ────────────────────────────────────────── */

.notions-alphabet {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    justify-content: center;
    padding: 1rem 1.25rem;
    border-radius: var(--notions-radius);
    background: var(--notions-surface-elevated);
    border: 1px solid var(--notions-border);
    box-shadow: var(--notions-card-shadow);
    margin-bottom: 2rem;
    position: sticky;
    top: 80px;
    z-index: 20;
}

.notions-alphabet__letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--notions-radius-sm);
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--notions-text-secondary);
    text-decoration: none;
    transition: all var(--notions-transition);
    border: 1px solid transparent;
}

.notions-alphabet__letter:hover,
.notions-alphabet__letter.is-active {
    color: #fff;
    background: var(--notions-accent);
    border-color: var(--notions-accent);
    box-shadow: 0 2px 8px var(--notions-glow-strong);
}

/* ── LETTER GROUPS ──────────────────────────────────────── */

.notions-letter-group {
    margin-bottom: 2rem;
}

.notions-letter-group__heading {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--notions-border);
}

.notions-letter-group__letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--notions-radius-sm);
    background: linear-gradient(135deg, var(--notions-accent), var(--notions-accent-light));
    color: #fff;
    font-size: 1.125rem;
    font-weight: 800;
    flex-shrink: 0;
}

.notions-letter-group__count {
    font-size: 0.8125rem;
    color: var(--notions-text-muted);
    font-weight: 500;
}

.notions-letter-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 0.625rem;
}

.notions-letter-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-radius: var(--notions-radius-sm);
    background: var(--notions-surface-elevated);
    border: 1px solid var(--notions-border);
    text-decoration: none;
    color: inherit;
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1),
                border-color 0.25s ease,
                background 0.25s ease,
                box-shadow 0.25s ease;
    gap: 0.75rem;
}

.notions-letter-item:hover {
    border-color: var(--notions-border-hover);
    background: var(--notions-glow);
    transform: translateX(4px);
    box-shadow: 0 2px 12px var(--notions-glow);
}

.notions-letter-item__name {
    font-weight: 600;
    color: var(--notions-text);
    font-size: 0.9375rem;
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.notions-letter-item__badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: rgba(99, 102, 241, 0.1);
    color: var(--notions-accent);
    flex-shrink: 0;
}

.notions-letter-item--enriched {
    border-color: rgba(99, 102, 241, 0.15);
}

.notions-letter-item--enriched:hover {
    border-color: var(--notions-accent);
}

.notions-letter-item__count {
    font-size: 0.8125rem;
    color: var(--notions-text-muted);
    white-space: nowrap;
    flex-shrink: 0;
}

.notions-letter-item:hover .notions-letter-item__name {
    color: var(--notions-accent);
}

/* ── FILTERS BAR (Global index) ──────────────────────────── */

.notions-filters {
    display: grid;
    grid-template-columns: repeat(4, 1fr) auto;
    gap: 0.625rem;
    margin-bottom: 1.5rem;
    padding: 1.25rem;
    border-radius: var(--notions-radius);
    background: var(--notions-surface-elevated);
    border: 1px solid var(--notions-border);
    box-shadow: var(--notions-card-shadow);
}

.notions-filters__field {
    min-width: 0;
}

.notions-filters__control {
    width: 100%;
    height: 44px;
    border-radius: var(--notions-radius-sm);
    border: 1px solid var(--notions-border);
    background: var(--notions-surface);
    color: var(--notions-text);
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0 0.875rem;
    outline: none;
    transition: border-color var(--notions-transition), box-shadow var(--notions-transition);
}

.notions-filters__control:focus {
    border-color: var(--notions-accent);
    box-shadow: 0 0 0 3px var(--notions-glow);
}

.notions-filters__select {
    appearance: none;
    -webkit-appearance: none;
    padding-right: 2.25rem;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M2 4l4 4 4-4' fill='none' stroke='%2364748b' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.875rem center;
}

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

.notions-filters__btn {
    height: 44px;
    padding: 0 1.5rem;
    border-radius: var(--notions-radius-sm);
    background: linear-gradient(135deg, var(--notions-accent), var(--notions-accent-light));
    color: #fff;
    font-weight: 700;
    font-size: 0.875rem;
    border: none;
    cursor: pointer;
    transition: all var(--notions-transition);
    box-shadow: 0 4px 14px var(--notions-glow-strong);
    white-space: nowrap;
}

.notions-filters__btn:hover {
    box-shadow: 0 6px 20px var(--notions-glow-strong);
    transform: translateY(-1px);
}

/* ── CHIPS ───────────────────────────────────────────────── */

.notions-chips {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.notions-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 0.875rem;
    border-radius: var(--notions-radius-pill);
    border: 1px solid var(--notions-border);
    background: var(--notions-surface-elevated);
    color: var(--notions-text-secondary);
    font-size: 0.8125rem;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--notions-transition);
}

.notions-chip:hover {
    border-color: var(--notions-border-hover);
    color: var(--notions-accent);
    background: var(--notions-glow);
}

/* ── PAGINATION ──────────────────────────────────────────── */

.notions-pagination {
    display: flex;
    gap: 0.375rem;
    justify-content: center;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.notions-pagination__item {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 0.625rem;
    border-radius: var(--notions-radius-sm);
    border: 1px solid var(--notions-border);
    background: var(--notions-surface-elevated);
    color: var(--notions-text-secondary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all var(--notions-transition);
}

.notions-pagination__item:hover {
    border-color: var(--notions-border-hover);
    color: var(--notions-accent);
}

.notions-pagination__item.is-active {
    background: linear-gradient(135deg, var(--notions-accent), var(--notions-accent-light));
    color: #fff;
    border-color: transparent;
    box-shadow: 0 2px 8px var(--notions-glow-strong);
}

/* ── FAQ PREMIUM ─────────────────────────────────────────── */

.notions-faq {
    padding: 2rem;
    border-radius: var(--notions-radius);
    background: var(--notions-surface-alt);
    border: 1px solid var(--notions-border);
}

.notions-faq__list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.notions-faq__item {
    background: var(--notions-surface-elevated);
    border: 1px solid var(--notions-border);
    border-radius: var(--notions-radius-sm);
    overflow: hidden;
    transition: border-color var(--notions-transition);
}

.notions-faq__item[open] {
    border-color: var(--notions-border-hover);
    box-shadow: 0 2px 12px var(--notions-glow);
}

.notions-faq__question {
    padding: 1.125rem 1.25rem;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--notions-text);
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    transition: color var(--notions-transition);
}

.notions-faq__question::-webkit-details-marker {
    display: none;
}

.notions-faq__question::after {
    content: '';
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--notions-glow);
    flex-shrink: 0;
    position: relative;
    transition: all var(--notions-transition);
}

.notions-faq__question::after {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M6 2v8M2 6h8' fill='none' stroke='%236366f1' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 12px;
    background-color: var(--notions-glow);
}

.notions-faq__item[open] .notions-faq__question::after {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M2 6h8' fill='none' stroke='%236366f1' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
    background-color: var(--notions-glow-strong);
}

.notions-faq__answer {
    padding: 0 1.25rem 1.25rem;
    color: var(--notions-text-secondary);
    line-height: 1.7;
    font-size: 0.9375rem;
}

.notions-faq__answer ul {
    margin: 0.75rem 0 0 1.25rem;
    padding: 0;
}

.notions-faq__answer li {
    margin-bottom: 0.5rem;
}

.notions-faq__answer strong {
    color: var(--notions-text);
}

/* ── ACADEMIC CONTENT PREMIUM ────────────────────────────── */

.notion-academic {
    border: 1px solid var(--notions-border);
    border-radius: var(--notions-radius);
    background: var(--notions-surface-elevated);
    overflow: hidden;
}

.notion-academic__intro {
    padding: 1.75rem 2rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.06) 0%, rgba(139, 92, 246, 0.04) 100%);
    border-bottom: 1px solid var(--notions-border);
    font-size: 1rem;
    line-height: 1.75;
    color: var(--notions-text-secondary);
}

.notion-academic__intro p {
    margin: 0;
}

.notion-academic__block {
    padding: 1.75rem 2rem;
    border-bottom: 1px solid var(--notions-border);
}

.notion-academic__block:last-child {
    border-bottom: none;
}

.notion-academic__block-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--notions-text);
    margin: 0 0 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.notion-academic__block-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: var(--notions-glow);
    color: var(--notions-accent);
    font-size: 0.8125rem;
    flex-shrink: 0;
}

/* Objectives list */
.notion-academic__objectives {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.notion-academic__objectives li {
    display: flex;
    align-items: flex-start;
    gap: 0.625rem;
    padding: 0.75rem 1rem;
    border-radius: var(--notions-radius-sm);
    background: var(--notions-surface-alt);
    font-size: 0.9375rem;
    color: var(--notions-text-secondary);
    line-height: 1.5;
}

.notion-academic__objectives li::before {
    content: '→';
    color: var(--notions-accent);
    font-weight: 700;
    flex-shrink: 0;
}

/* Concept cards */
.notion-academic__concepts {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
}

.notion-academic__concept {
    padding: 1.25rem;
    border-radius: var(--notions-radius-sm);
    background: var(--notions-surface-alt);
    border: 1px solid var(--notions-border);
    transition: border-color var(--notions-transition);
}

.notion-academic__concept:hover {
    border-color: var(--notions-border-hover);
}

.notion-academic__concept-name {
    font-size: 1rem;
    font-weight: 700;
    color: var(--notions-accent);
    margin: 0 0 0.625rem;
}

.notion-academic__concept-field {
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    color: var(--notions-text-secondary);
    line-height: 1.55;
}

.notion-academic__concept-field strong {
    color: var(--notions-text);
    font-weight: 600;
}

.notion-academic__concept-field code {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    border-radius: 6px;
    background: var(--notions-glow);
    color: var(--notions-accent);
    font-size: 0.8125rem;
    font-family: 'SF Mono', 'Fira Code', monospace;
}

/* Author entries */
.notion-academic__authors-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.notion-academic__author {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    padding: 0.625rem 0;
    border-bottom: 1px dashed var(--notions-border);
    font-size: 0.9375rem;
}

.notion-academic__author:last-child {
    border-bottom: none;
}

.notion-academic__author strong {
    color: var(--notions-text);
    white-space: nowrap;
}

.notion-academic__author span {
    color: var(--notions-text-secondary);
}

/* Trap/pitfall cards */
.notion-academic__traps {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.notion-academic__trap {
    padding: 1.25rem;
    border-radius: var(--notions-radius-sm);
    background: rgba(239, 68, 68, 0.04);
    border: 1px solid rgba(239, 68, 68, 0.15);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.notion-academic__trap-row {
    margin-bottom: 0.5rem;
}

.notion-academic__trap-row:last-child {
    margin-bottom: 0;
}

.notion-academic__trap-label {
    font-weight: 700;
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.notion-academic__trap-label--error {
    color: #ef4444;
}

.notion-academic__trap-label--why {
    color: #f59e0b;
}

.notion-academic__trap-label--fix {
    color: #10b981;
}

/* Summary box */
.notion-academic__summary {
    margin: 1.75rem 2rem;
    padding: 1.5rem;
    border-radius: var(--notions-radius-sm);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(139, 92, 246, 0.06) 100%);
    border-left: 4px solid var(--notions-accent);
}

.notion-academic__summary p {
    margin: 0;
    font-size: 0.9375rem;
    color: var(--notions-text-secondary);
    line-height: 1.7;
}

/* Internal links row */
.notion-academic__links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.625rem;
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--notions-border);
}

.notion-academic__link {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 1rem;
    border-radius: var(--notions-radius-sm);
    border: 1px solid var(--notions-border);
    background: var(--notions-surface);
    color: var(--notions-text-secondary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all var(--notions-transition);
}

.notion-academic__link:hover {
    border-color: var(--notions-border-hover);
    color: var(--notions-accent);
    background: var(--notions-glow);
}

.notion-academic__link--primary {
    background: linear-gradient(135deg, var(--notions-accent), var(--notions-accent-light));
    color: #fff;
    border-color: transparent;
}

.notion-academic__link--primary:hover {
    background: linear-gradient(135deg, var(--notions-accent-dark), var(--notions-accent));
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 4px 14px var(--notions-glow-strong);
}

/* ── RELATED NOTIONS TAGS ────────────────────────────────── */

.notions-related-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.625rem;
}

.notions-related-tag {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.25rem;
    border-radius: var(--notions-radius-sm);
    background: var(--notions-surface-elevated);
    border: 1px solid var(--notions-border);
    color: var(--notions-text);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: all var(--notions-transition);
}

.notions-related-tag:hover {
    border-color: var(--notions-border-hover);
    color: var(--notions-accent);
    background: var(--notions-glow);
    transform: translateY(-2px);
    box-shadow: var(--notions-card-shadow-hover);
}

/* ── CTA BAR ─────────────────────────────────────────────── */

.notions-cta-bar {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    padding-top: 1.5rem;
    border-top: 1px solid var(--notions-border);
}

.notions-cta-link {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    min-height: 44px;
    padding: 0.625rem 1.125rem;
    border-radius: var(--notions-radius-sm);
    border: 1px solid var(--notions-border);
    background: var(--notions-surface-elevated);
    color: var(--notions-text-secondary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all var(--notions-transition);
}

.notions-cta-link:hover {
    border-color: var(--notions-border-hover);
    color: var(--notions-accent);
    background: var(--notions-glow);
    transform: translateY(-1px);
}

/* ── SEO CONTENT CARDS (fallback) ────────────────────────── */

.notions-seo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1rem;
}

.notions-seo-card {
    padding: 1.5rem;
    border-radius: var(--notions-radius);
    background: var(--notions-surface-elevated);
    border: 1px solid var(--notions-border);
    box-shadow: var(--notions-card-shadow);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1),
                box-shadow 0.3s ease,
                border-color 0.3s ease;
}

.notions-seo-card:hover {
    border-color: var(--notions-border-hover);
    transform: translateY(-3px);
    box-shadow: var(--notions-card-shadow-hover), 0 0 0 1px var(--notions-glow);
}

.notions-seo-card__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: var(--notions-radius-sm);
    background: linear-gradient(135deg, var(--notions-glow), var(--notions-glow-strong));
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.notions-seo-card__title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--notions-text);
    margin: 0 0 0.5rem;
}

.notions-seo-card__text {
    font-size: 0.875rem;
    color: var(--notions-text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* ── RESPONSIVE ──────────────────────────────────────────── */

@media (max-width: 1100px) {
    .notions-grid--wide {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 860px) {
    .notions-filters {
        grid-template-columns: repeat(2, 1fr);
    }

    .notions-filters__btn {
        grid-column: 1 / -1;
    }

    .notions-grid--wide {
        grid-template-columns: repeat(2, 1fr);
    }

    .notion-academic__concepts {
        grid-template-columns: 1fr;
    }

    .notions-seo-grid {
        grid-template-columns: 1fr;
    }
}

/* ── TABLET (768px) ──────────────────────────────────────── */

@media (max-width: 768px) {

    /* Hero */
    .qcm-hub-hero--notions-global,
    .qcm-hub-hero--notions-index {
        padding: 2.5rem 1.75rem 2rem;
        border-radius: 20px;
    }

    .qcm-hub-hero--notions-global .qcm-hub-hero__title,
    .qcm-hub-hero--notions-index .qcm-hub-hero__title {
        font-size: 1.75rem;
    }

    .qcm-hub-hero--notions-global .qcm-hub-hero__subtitle,
    .qcm-hub-hero--notions-index .qcm-hub-hero__subtitle {
        font-size: 0.9375rem;
    }

    /* Grids: force 2 cols */
    .notions-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }

    .notions-grid--wide {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }

    /* Letter list: 2 cols */
    .notions-letter-list {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Cards: slightly smaller */
    .notion-card {
        padding: 1rem 1.125rem;
    }

    .notion-card__title {
        font-size: 0.9375rem;
    }

    .notion-card__desc {
        font-size: 0.8125rem;
        -webkit-line-clamp: 3;
    }

    /* Alphabet: reduce letter size */
    .notions-alphabet__letter {
        width: 32px;
        height: 32px;
        font-size: 0.75rem;
    }

    /* Section titles */
    .notions-section__title {
        font-size: 1.25rem;
    }

    .notions-section__subtitle {
        font-size: 0.875rem;
    }

    /* SEO grid: 1 col */
    .notions-seo-grid {
        grid-template-columns: 1fr;
    }

    /* Stats bar */
    .notion-stat__value {
        font-size: 1.5rem;
    }
}

@media (max-width: 640px) {

    /* ── HERO MOBILE ─────────────────────────────────────── */

    .qcm-hub-hero--notions-global,
    .qcm-hub-hero--notions-index {
        padding: 2rem 1.25rem 1.75rem;
        margin-bottom: 1.5rem;
        border-radius: 16px;
    }

    .qcm-hub-hero--notions-global .qcm-hub-hero__badge,
    .qcm-hub-hero--notions-index .qcm-hub-hero__badge {
        font-size: 0.6875rem;
        padding: 0.375rem 0.75rem;
        margin-bottom: 0.875rem;
    }

    .qcm-hub-hero--notions-global .qcm-hub-hero__title,
    .qcm-hub-hero--notions-index .qcm-hub-hero__title {
        font-size: 1.5rem !important;
        line-height: 1.2 !important;
        margin-bottom: 0.75rem;
    }

    .qcm-hub-hero--notions-global .qcm-hub-hero__subtitle,
    .qcm-hub-hero--notions-index .qcm-hub-hero__subtitle {
        font-size: 0.875rem !important;
        line-height: 1.55 !important;
    }

    .notion-stats-bar {
        gap: 0;
        margin-top: 1.25rem;
        justify-content: space-around;
        width: 100%;
    }

    .notion-stat {
        flex: 1;
        position: relative;
    }

    .notion-stat + .notion-stat::before {
        content: '';
        position: absolute;
        left: 0;
        top: 15%;
        height: 70%;
        width: 1px;
        background: rgba(255, 255, 255, 0.2);
    }

    .notion-stat__value {
        font-size: 1.5rem;
    }

    .notion-stat__label {
        font-size: 0.625rem;
        letter-spacing: 0.06em;
    }

    /* ── ANCHOR NAV — HORIZONTAL SCROLL ──────────────────── */

    .notions-nav {
        position: sticky;
        top: 60px;
        display: flex;
        flex-wrap: nowrap;
        gap: 0.375rem;
        padding: 0.625rem 0.75rem;
        border-radius: 12px;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        margin-bottom: 1.5rem;
        margin-left: -0.5rem;
        margin-right: -0.5rem;
        scroll-snap-type: x mandatory;
    }

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

    .notions-nav__item {
        flex: 0 0 auto;
        padding: 0.5rem 0.875rem;
        font-size: 0.8125rem;
        border-radius: 999px;
        scroll-snap-align: start;
        white-space: nowrap;
        gap: 0.375rem;
    }

    .notions-nav__item .notions-section__title-icon {
        width: auto;
        height: auto;
        background: none;
        box-shadow: none;
        border-radius: 0;
        font-size: 0.875rem;
        color: inherit;
    }

    /* ── SECTION HEADINGS — FULL WIDTH ───────────────────── */

    .notions-section {
        margin-bottom: 2.5rem;
    }

    .notions-section__header {
        margin-bottom: 1.25rem;
    }

    .notions-section__title {
        font-size: 1.125rem;
        gap: 0.5rem;
        flex-wrap: nowrap;
        overflow: visible;
        white-space: normal;
        word-break: normal;
    }

    .notions-section__title-icon {
        width: 30px;
        height: 30px;
        min-width: 30px;
        border-radius: 8px;
        font-size: 0.875rem;
    }

    .notions-section__subtitle {
        font-size: 0.8125rem;
        line-height: 1.5;
    }

    /* ── CARDS GRID — 2 COLUMNS COMPACT ──────────────────── */

    .notions-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.625rem;
    }

    .notions-grid--compact {
        grid-template-columns: repeat(2, 1fr);
    }

    .notions-grid--wide {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.625rem;
    }

    .notion-card {
        padding: 0.875rem;
        border-radius: 12px;
    }

    .notion-card::before {
        height: 2px;
    }

    .notion-card__title {
        font-size: 0.8125rem;
        line-height: 1.35;
        margin-bottom: 0.25rem;
        display: -webkit-box;
        -webkit-line-clamp: 3;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    .notion-card__desc {
        font-size: 0.75rem;
        -webkit-line-clamp: 2;
        margin-bottom: 0.5rem;
    }

    .notion-card__meta {
        flex-wrap: wrap;
        gap: 0.25rem 0.5rem;
        font-size: 0.6875rem;
    }

    .notion-card__count {
        font-size: 0.75rem;
    }

    .notion-card__arrow {
        font-size: 0.75rem;
    }

    .notion-card__step {
        width: 20px;
        height: 20px;
        font-size: 0.625rem;
    }

    .notion-card__header-row {
        gap: 0.375rem;
        margin-bottom: 0.375rem;
    }

    .notion-card__enriched-badge {
        font-size: 0.625rem;
    }

    .notion-card:hover {
        transform: translateY(-2px);
    }

    /* ── CHIPS — SCROLLABLE ROW ──────────────────────────── */

    .notions-chips {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        padding-bottom: 0.25rem;
        margin-left: -0.25rem;
        margin-right: -0.25rem;
        padding-left: 0.25rem;
        padding-right: 0.25rem;
        scroll-snap-type: x proximity;
    }

    .notions-chips::-webkit-scrollbar {
        display: none;
    }

    .notions-chip {
        flex: 0 0 auto;
        font-size: 0.75rem;
        padding: 0.4375rem 0.75rem;
        scroll-snap-align: start;
    }

    /* ── FILTERS — STACKED ───────────────────────────────── */

    .notions-filters {
        grid-template-columns: 1fr 1fr;
        padding: 0.875rem;
        gap: 0.5rem;
        border-radius: 12px;
        margin-bottom: 1rem;
    }

    .notions-filters__control {
        height: 40px;
        font-size: 0.8125rem;
        border-radius: 8px;
        padding: 0 0.625rem;
    }

    .notions-filters__select {
        padding-right: 1.75rem;
        background-position: right 0.625rem center;
    }

    .notions-filters__btn {
        grid-column: 1 / -1;
        height: 40px;
        font-size: 0.8125rem;
        border-radius: 8px;
    }

    /* ── ALPHABET ────────────────────────────────────────── */

    .notions-alphabet {
        position: static;
        gap: 0.25rem;
        padding: 0.75rem;
        border-radius: 12px;
        margin-bottom: 1.5rem;
    }

    .notions-alphabet__letter {
        width: 30px;
        height: 30px;
        font-size: 0.6875rem;
        border-radius: 8px;
    }

    /* ── LETTER GROUPS ───────────────────────────────────── */

    .notions-letter-group {
        margin-bottom: 1.5rem;
    }

    .notions-letter-group__heading {
        gap: 0.5rem;
        margin-bottom: 0.625rem;
        padding-bottom: 0.375rem;
    }

    .notions-letter-group__letter {
        width: 32px;
        height: 32px;
        font-size: 0.9375rem;
        border-radius: 8px;
    }

    .notions-letter-group__count {
        font-size: 0.75rem;
    }

    .notions-letter-list {
        grid-template-columns: 1fr;
        gap: 0.375rem;
    }

    .notions-letter-item {
        padding: 0.625rem 0.75rem;
        border-radius: 8px;
        gap: 0.5rem;
    }

    .notions-letter-item__name {
        font-size: 0.8125rem;
        min-width: 0;
        white-space: normal;
        word-break: break-word;
    }

    .notions-letter-item__count {
        font-size: 0.6875rem;
    }

    /* ── EEAT / MISC ─────────────────────────────────────── */

    .notion-eeat-bar {
        gap: 0.375rem;
    }

    .notion-eeat-badge {
        font-size: 0.6875rem;
        padding: 0.375rem 0.625rem;
    }

    /* ── ACADEMIC / LESSON ───────────────────────────────── */

    .notion-academic__block {
        padding: 1.25rem;
    }

    .notion-academic__intro {
        padding: 1.25rem;
    }

    .notion-academic__summary {
        margin: 1.25rem;
    }

    .notion-academic__links {
        padding: 1.25rem;
    }

    /* ── FAQ ──────────────────────────────────────────────── */

    .notions-faq {
        padding: 0.875rem;
        border-radius: 12px;
    }

    .notions-faq__question {
        padding: 0.875rem 1rem;
        font-size: 0.8125rem;
    }

    .notions-faq__answer {
        padding: 0 1rem 1rem;
        font-size: 0.8125rem;
    }

    /* ── SEO CARDS ───────────────────────────────────────── */

    .notions-seo-grid {
        gap: 0.625rem;
    }

    .notions-seo-card {
        padding: 1rem;
        border-radius: 12px;
    }

    .notions-seo-card__title {
        font-size: 0.875rem;
    }

    .notions-seo-card__text {
        font-size: 0.8125rem;
    }

    /* ── CTA BAR ─────────────────────────────────────────── */

    .notions-cta-bar {
        flex-direction: column;
        gap: 0.5rem;
    }

    .notions-cta-link {
        width: 100%;
        justify-content: center;
        font-size: 0.8125rem;
        padding: 0.75rem;
        border-radius: 10px;
    }

    /* ── PAGINATION ──────────────────────────────────────── */

    .notions-pagination {
        gap: 0.25rem;
        margin-top: 1.5rem;
    }

    .notions-pagination__item {
        min-width: 36px;
        height: 36px;
        font-size: 0.8125rem;
        border-radius: 8px;
    }

    /* ── HERO (notion-hub variant) ────────────────────────── */

    .qcm-hub-hero--notion {
        padding: 40px 20px 36px;
    }

    /* ── TOUCH FEEDBACK — CARDS ───────────────────────────── */

    .notion-card:active {
        transform: scale(0.97);
        transition-duration: 0.1s;
    }

    .notions-nav__item:active {
        transform: scale(0.95);
        transition-duration: 0.1s;
    }

    .notions-chip:active {
        transform: scale(0.96);
        transition-duration: 0.1s;
    }

    .notions-letter-item:active {
        transform: scale(0.98) translateX(2px);
        transition-duration: 0.1s;
    }

    .notions-pagination__item:active {
        transform: scale(0.92);
        transition-duration: 0.1s;
    }

    .notions-cta-link:active {
        transform: scale(0.97);
        transition-duration: 0.1s;
    }
}

/* ════════════════════════════════════════════════════════════
   LESSON APP LAYOUT — Modern course/lesson experience
   ════════════════════════════════════════════════════════════ */

/* ── READING PROGRESS BAR ────────────────────────────────── */

.notion-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    z-index: 9999;
    background: transparent;
    pointer-events: none;
}

.notion-progress__bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--notions-accent), var(--notions-accent-light));
    border-radius: 0 2px 2px 0;
    transition: width 0.1s linear;
    box-shadow: 0 0 8px var(--notions-glow-strong);
}

/* ── LESSON META CHIPS ───────────────────────────────────── */

.notion-lesson-meta {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.notion-lesson-meta__chip {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.4375rem 0.875rem;
    border-radius: var(--notions-radius-pill);
    background: var(--notions-surface-elevated);
    border: 1px solid var(--notions-border);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--notions-text-secondary);
    white-space: nowrap;
}

.notion-lesson-meta__chip svg {
    opacity: 0.65;
    flex-shrink: 0;
}

.notion-lesson-meta__chip--accent {
    background: var(--notions-glow);
    border-color: var(--notions-border-hover);
    color: var(--notions-accent);
}

/* ── TWO-COLUMN LESSON LAYOUT ────────────────────────────── */

.notion-lesson {
    display: grid;
    grid-template-columns: 1fr 260px;
    gap: 2.5rem;
    align-items: start;
}

.notion-lesson__content {
    min-width: 0;
}

.notion-lesson__sidebar {
    position: sticky;
    top: 100px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--notions-border) transparent;
}

/* ── TABLE OF CONTENTS ───────────────────────────────────── */

.notion-toc {
    padding: 1.25rem;
    border-radius: var(--notions-radius);
    background: var(--notions-surface-elevated);
    border: 1px solid var(--notions-border);
    box-shadow: var(--notions-card-shadow);
}

.notion-toc__title {
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--notions-text-muted);
    margin: 0 0 0.875rem;
    padding-bottom: 0.625rem;
    border-bottom: 1px solid var(--notions-border);
}

.notion-toc__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.notion-toc__link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.625rem;
    border-radius: 8px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--notions-text-secondary);
    text-decoration: none;
    transition: all var(--notions-transition);
    line-height: 1.35;
    border-left: 2px solid transparent;
    margin-left: -2px;
}

.notion-toc__link:hover {
    color: var(--notions-text);
    background: var(--notions-glow);
}

.notion-toc__link.is-active {
    color: var(--notions-accent);
    background: var(--notions-glow);
    border-left-color: var(--notions-accent);
    font-weight: 600;
}

.notion-toc__number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 6px;
    background: var(--notions-border);
    color: var(--notions-text-muted);
    font-size: 0.6875rem;
    font-weight: 700;
    flex-shrink: 0;
    transition: all var(--notions-transition);
}

.notion-toc__link.is-active .notion-toc__number {
    background: var(--notions-accent);
    color: #fff;
}

/* Sidebar related notions (compact) */
.notion-toc__related {
    padding: 1.25rem;
    border-radius: var(--notions-radius);
    background: var(--notions-surface-elevated);
    border: 1px solid var(--notions-border);
    box-shadow: var(--notions-card-shadow);
}

.notion-toc__related-title {
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--notions-text-muted);
    margin: 0 0 0.75rem;
    padding-bottom: 0.625rem;
    border-bottom: 1px solid var(--notions-border);
}

.notion-toc__related-list {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.notion-toc__related-link {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.4375rem 0.625rem;
    border-radius: 8px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--notions-text-secondary);
    text-decoration: none;
    transition: all var(--notions-transition);
}

.notion-toc__related-link:hover {
    color: var(--notions-accent);
    background: var(--notions-glow);
}

.notion-toc__related-link::before {
    content: '→';
    color: var(--notions-text-muted);
    font-size: 0.75rem;
    transition: color var(--notions-transition);
}

.notion-toc__related-link:hover::before {
    color: var(--notions-accent);
}

/* ── LESSON STEPS (NUMBERED SECTIONS) ────────────────────── */

.notion-step {
    position: relative;
    padding-left: 3rem;
    margin-bottom: 2.5rem;
}

.notion-step::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 40px;
    bottom: -2.5rem;
    width: 2px;
    background: var(--notions-border);
}

.notion-step:last-child::before {
    display: none;
}

.notion-step__number {
    position: absolute;
    left: 0;
    top: 0;
    width: 32px;
    height: 32px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--notions-accent), var(--notions-accent-light));
    color: #fff;
    font-size: 0.8125rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px var(--notions-glow-strong);
    z-index: 1;
}

.notion-step__number--warning {
    background: linear-gradient(135deg, #ef4444, #f87171);
    box-shadow: 0 2px 8px rgba(239, 68, 68, 0.25);
}

.notion-step__number--success {
    background: linear-gradient(135deg, #10b981, #34d399);
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.25);
}

.notion-step__number--quiz {
    background: linear-gradient(135deg, #f59e0b, #fbbf24);
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.25);
}

.notion-step__title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--notions-text);
    margin: 0.25rem 0 0.875rem;
    line-height: 1.3;
}

.notion-step__content {
    border-radius: var(--notions-radius);
    overflow: hidden;
}

/* ── CALLOUT BOXES ───────────────────────────────────────── */

.notion-callout {
    display: flex;
    gap: 0.875rem;
    padding: 1.125rem 1.25rem;
    border-radius: var(--notions-radius-sm);
    margin-bottom: 1rem;
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--notions-text-secondary);
}

.notion-callout__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    flex-shrink: 0;
    margin-top: 0.125rem;
}

.notion-callout__body {
    flex: 1;
    min-width: 0;
}

.notion-callout__body p {
    margin: 0;
}

.notion-callout--info {
    background: rgba(99, 102, 241, 0.06);
    border: 1px solid rgba(99, 102, 241, 0.15);
}

.notion-callout--info .notion-callout__icon {
    background: rgba(99, 102, 241, 0.12);
    color: var(--notions-accent);
}

.notion-callout--warning {
    background: rgba(245, 158, 11, 0.06);
    border: 1px solid rgba(245, 158, 11, 0.15);
}

.notion-callout--warning .notion-callout__icon {
    background: rgba(245, 158, 11, 0.12);
    color: #d97706;
}

.notion-callout--tip {
    background: rgba(16, 185, 129, 0.06);
    border: 1px solid rgba(16, 185, 129, 0.15);
}

.notion-callout--tip .notion-callout__icon {
    background: rgba(16, 185, 129, 0.12);
    color: #059669;
}

.notion-callout--danger {
    background: rgba(239, 68, 68, 0.06);
    border: 1px solid rgba(239, 68, 68, 0.15);
}

.notion-callout--danger .notion-callout__icon {
    background: rgba(239, 68, 68, 0.12);
    color: #dc2626;
}

/* ── INLINE QUIZ CTA ─────────────────────────────────────── */

.notion-quiz-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    padding: 1.5rem 2rem;
    border-radius: var(--notions-radius);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(139, 92, 246, 0.06) 100%);
    border: 1px solid var(--notions-border-hover);
    margin-top: 1rem;
}

.notion-quiz-cta__text {
    flex: 1;
}

.notion-quiz-cta__title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--notions-text);
    margin: 0;
}

.notion-quiz-cta__desc {
    font-size: 0.875rem;
    color: var(--notions-text-secondary);
    margin: 0.25rem 0 0;
}

.notion-quiz-cta__btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--notions-radius-sm);
    background: linear-gradient(135deg, var(--notions-accent), var(--notions-accent-light));
    color: #fff;
    text-decoration: none;
    font-weight: 700;
    font-size: 0.875rem;
    border: none;
    cursor: pointer;
    white-space: nowrap;
    transition: all var(--notions-transition);
    box-shadow: 0 4px 14px var(--notions-glow-strong);
}

.notion-quiz-cta__btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--notions-glow-strong);
}

/* ── LEARNING PATH (PREV/NEXT NAV) ──────────────────────── */

.notion-learning-path {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--notions-border);
}

.notion-learning-path__item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: 1.125rem 1.25rem;
    border-radius: var(--notions-radius);
    background: var(--notions-surface-elevated);
    border: 1px solid var(--notions-border);
    text-decoration: none;
    transition: all var(--notions-transition);
}

.notion-learning-path__item:hover {
    border-color: var(--notions-border-hover);
    box-shadow: var(--notions-card-shadow-hover);
    transform: translateY(-2px);
}

.notion-learning-path__item--next {
    text-align: right;
}

.notion-learning-path__label {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--notions-text-muted);
}

.notion-learning-path__name {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--notions-text);
    transition: color var(--notions-transition);
}

.notion-learning-path__item:hover .notion-learning-path__name {
    color: var(--notions-accent);
}

/* ── SIDEBAR CTA CARD ────────────────────────────────────── */

.notion-sidebar-cta {
    padding: 1.25rem;
    border-radius: var(--notions-radius);
    background: linear-gradient(135deg, var(--notions-accent) 0%, var(--notions-accent-light) 100%);
    color: #fff;
    text-align: center;
}

.notion-sidebar-cta__title {
    font-size: 0.875rem;
    font-weight: 700;
    margin: 0 0 0.5rem;
}

.notion-sidebar-cta__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    width: 100%;
    padding: 0.625rem 1rem;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: #fff;
    font-weight: 700;
    font-size: 0.8125rem;
    text-decoration: none;
    transition: all var(--notions-transition);
}

.notion-sidebar-cta__btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ── LESSON RESPONSIVE ───────────────────────────────────── */

@media (max-width: 960px) {
    .notion-lesson {
        grid-template-columns: 1fr;
    }

    .notion-lesson__sidebar {
        position: static;
        max-height: none;
        display: none; /* Hide TOC on mobile, show inline nav instead */
    }

    .notion-learning-path {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .notion-step {
        padding-left: 2.5rem;
    }

    .notion-step__number {
        width: 28px;
        height: 28px;
        font-size: 0.75rem;
        border-radius: 8px;
    }

    .notion-step::before {
        left: 13px;
        top: 36px;
    }

    .notion-quiz-cta {
        flex-direction: column;
        text-align: center;
        padding: 1.25rem;
    }

    .notion-lesson-meta {
        gap: 0.5rem;
    }

    .notion-lesson-meta__chip {
        font-size: 0.75rem;
        padding: 0.375rem 0.625rem;
    }
}

/* ── ULTRA-SMALL MOBILE (< 400px) ───────────────────────── */

@media (max-width: 400px) {
    .notions-grid,
    .notions-grid--wide,
    .notions-grid--compact {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .notion-card {
        padding: 0.75rem;
    }

    .notions-filters {
        grid-template-columns: 1fr;
    }

    .notion-stats-bar {
        gap: 0;
    }

    .notion-stat__value {
        font-size: 1.25rem;
    }
}