:root {
    --brand-primary: #222f6e;
    --brand-secondary: #2563eb;
    --brand-accent: #eac000;
    --brand-hover: #1a2a60;
    --surface: #ffffff;
    --surface-alt: #f8fbff;
    --border: #e4e9f2;
    --text-main: #1e2a4a;
    --text-muted: #5f687b;
    --text-light: #9ca3af;
    --shadow-sm: 0 2px 8px rgba(34, 47, 110, 0.07);
    --shadow-md: 0 6px 18px rgba(34, 47, 110, 0.1);
}

/* ── Hero ── */
.uv-hero {
    background: linear-gradient(135deg, var(--brand-primary) 0%, #1e3a8a 100%);
    color: #fff;
    padding: 2.2rem 0 0;
}

.uv-hero-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem 2rem;
}

.uv-breadcrumb {
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.65);
    margin-bottom: 1rem;
}

.uv-breadcrumb a {
    color: rgba(255, 255, 255, 0.75);
    text-decoration: none;
}

.uv-breadcrumb a:hover { color: #fff; }
.uv-breadcrumb span { margin: 0 0.4rem; }

.uv-level-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(234, 192, 0, 0.18);
    color: var(--brand-accent);
    border: 1px solid rgba(234, 192, 0, 0.35);
    border-radius: 4px;
    padding: 0.25rem 0.75rem;
    margin-bottom: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.uv-unit-title {
    font-size: 1.65rem;
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 0.5rem;
    color: #fff;
}

.uv-unit-desc {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 1rem;
    max-width: 680px;
    line-height: 1.6;
}

/* Action buttons */
.uv-hero-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    padding: 0.5rem 0 0;
}

.uv-btn-start {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--brand-accent);
    color: #000;
    font-weight: 700;
    font-size: 0.9rem;
    padding: 0.6rem 1.4rem;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    text-decoration: none;
    border-bottom: 3px solid #c9a000;
}

.uv-btn-start:hover {
    background: #f0ca00;
    color: #000;
    text-decoration: none;
}

.uv-btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    color: rgba(255, 255, 255, 0.85);
    font-weight: 600;
    font-size: 0.88rem;
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    cursor: pointer;
    text-decoration: none;
}

.uv-btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    text-decoration: none;
}

.uv-btn-ai {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, #222f6e 0%, #2563eb 100%);
    color: #fff;
    font-weight: 700;
    font-size: 0.9rem;
    padding: 0.6rem 1.4rem;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    text-decoration: none;
    box-shadow: 0 6px 18px rgba(34, 47, 110, 0.4);
    transition: filter 0.2s, transform 0.2s;
}

.uv-btn-ai:hover {
    color: #fff;
    text-decoration: none;
    filter: brightness(1.08);
    transform: translateY(-1px);
}

.uv-btn-ai .uv-ai-pulse {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #a5f3fc;
    box-shadow: 0 0 0 0 rgba(165, 243, 252, 0.7);
    animation: uv-ai-pulse 1.8s infinite;
}

@keyframes uv-ai-pulse {
    0% { box-shadow: 0 0 0 0 rgba(165, 243, 252, 0.6); }
    70% { box-shadow: 0 0 0 8px rgba(165, 243, 252, 0); }
    100% { box-shadow: 0 0 0 0 rgba(165, 243, 252, 0); }
}

.uv-access-icon.icon-ai { background: linear-gradient(135deg, #222f6e, #2563eb); }

/* Stats bar */
.uv-stats-bar {
    display: flex;
    gap: 0;
    background: rgba(0, 0, 0, 0.2);
    margin: 0;
    padding: 0 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    max-width: 100%;
    overflow-x: auto;
}

.uv-stat {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.85rem 1.2rem;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.85);
    border-right: 1px solid rgba(255, 255, 255, 0.1);
    white-space: nowrap;
}

.uv-stat:last-child { border-right: none; }

.uv-stat strong {
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
}

.uv-stat i { font-size: 0.9rem; opacity: 0.7; }

/* ── Page body ── */
.uv-body {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem 1.5rem 4rem;
}

/* ── Panels ── */
.uv-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.4rem 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.uv-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.2rem;
    padding-bottom: 0.9rem;
    border-bottom: 1px solid var(--border);
}

.uv-panel-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--brand-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
}

.uv-panel-title i { color: var(--brand-secondary); font-size: 1rem; }

.uv-count-pill {
    background: var(--brand-primary);
    color: #fff;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 0.15rem 0.6rem;
    border-radius: 20px;
}

/* View toggle */
.uv-view-toggle {
    display: flex;
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: 6px;
    overflow: hidden;
}

.uv-view-toggle button {
    padding: 0.35rem 0.8rem;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 0.82rem;
    cursor: pointer;
    font-weight: 500;
}

.uv-view-toggle button.active {
    background: var(--brand-primary);
    color: #fff;
}

/* ── Tabs ── */
.uv-tabs {
    display: flex;
    gap: 0;
    border-bottom: 2px solid var(--border);
    margin-bottom: 1.2rem;
}

.uv-tab {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.7rem 1.1rem;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-muted);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    margin-bottom: -2px;
    transition: color 0.2s, border-color 0.2s;
}

.uv-tab:hover { color: var(--brand-primary); }

.uv-tab.active {
    color: var(--brand-primary);
    border-bottom-color: var(--brand-primary);
}

.uv-tab-content { display: none; }
.uv-tab-content.active { display: block; }

/* ── Topic cards ── */
.uv-topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
    gap: 1rem;
}

.uv-topics-grid.uv-list-view {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.uv-topic-card {
    display: flex;
    flex-direction: column;
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.uv-topic-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 100%;
    background: var(--brand-primary);
    opacity: 0;
    transition: opacity 0.2s;
}

.uv-topic-card:hover {
    border-color: var(--brand-secondary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.uv-topic-card:hover::before { opacity: 1; }

.uv-topic-card.uv-locked {
    opacity: 0.7;
    background: #fffbf0;
    border-color: #fde68a;
}

.uv-topics-grid.uv-list-view .uv-topic-card {
    flex-direction: row;
    align-items: flex-start;
    gap: 0.9rem;
}

.uv-topics-grid.uv-list-view .uv-topic-foot {
    margin-left: auto;
    padding-top: 0;
    border-top: none;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.25rem;
    flex-shrink: 0;
}

.uv-topic-icon-wrap {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: rgba(34, 47, 110, 0.1);
    color: var(--brand-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    flex-shrink: 0;
}

.uv-topic-card.uv-locked .uv-topic-icon-wrap {
    background: rgba(234, 192, 0, 0.15);
    color: #92400e;
}

.uv-topic-body { flex: 1; }

.uv-topic-name {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-main);
    line-height: 1.4;
    margin-bottom: 0.3rem;
}

.uv-topic-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.uv-topic-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 0.8rem;
    padding-top: 0.6rem;
    border-top: 1px solid var(--border);
}

.uv-time-chip {
    font-size: 0.72rem;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.uv-btn-explore {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--brand-primary);
    background: rgba(34, 47, 110, 0.07);
    border: 1px solid rgba(34, 47, 110, 0.15);
    border-radius: 5px;
    padding: 0.25rem 0.7rem;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    transition: all 0.15s;
}

.uv-btn-explore:hover {
    background: var(--brand-primary);
    color: #fff;
    text-decoration: none;
}

.uv-btn-upgrade {
    font-size: 0.78rem;
    font-weight: 600;
    color: #92400e;
    background: rgba(234, 192, 0, 0.15);
    border: 1px solid rgba(234, 192, 0, 0.4);
    border-radius: 5px;
    padding: 0.25rem 0.7rem;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
}

.uv-btn-upgrade:hover {
    background: var(--brand-accent);
    color: #000;
    text-decoration: none;
}

/* ── Material cards ── */
.uv-mats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1rem;
}

.uv-mats-grid.uv-list-view {
    grid-template-columns: 1fr;
}

.uv-mat-card {
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    transition: all 0.2s ease;
    text-decoration: none;
    color: var(--text-main);
}

.uv-mat-card:hover {
    border-color: var(--brand-secondary);
    box-shadow: var(--shadow-md);
    color: var(--text-main);
    text-decoration: none;
}

.uv-mat-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.uv-mat-type {
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 0.2rem 0.55rem;
    border-radius: 4px;
}

.uv-mat-type.type-pdf   { background: #fef2f2; color: #b91c1c; }
.uv-mat-type.type-doc   { background: #eff6ff; color: #1d4ed8; }
.uv-mat-type.type-video { background: #f0fdf4; color: #15803d; }
.uv-mat-type.type-other { background: #f5f5f5; color: #6b7280; }

.uv-mat-date {
    font-size: 0.72rem;
    color: var(--text-light);
}

.uv-mat-title {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-main);
    line-height: 1.4;
    flex: 1;
}

.uv-mat-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--brand-primary);
    background: rgba(34, 47, 110, 0.07);
    border: 1px solid rgba(34, 47, 110, 0.15);
    border-radius: 5px;
    padding: 0.4rem 0.85rem;
    align-self: flex-start;
    transition: all 0.15s;
}

.uv-mat-card:hover .uv-mat-btn {
    background: var(--brand-primary);
    color: #fff;
}

/* ── Progress ── */
.uv-progress-list {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.uv-prog-row {
    display: flex;
    align-items: center;
    gap: 0.9rem;
}

.uv-prog-label {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-muted);
    min-width: 140px;
}

.uv-prog-bar-wrap {
    flex: 1;
    height: 8px;
    background: var(--border);
    border-radius: 99px;
    overflow: hidden;
}

.uv-prog-bar {
    height: 100%;
    background: var(--brand-secondary);
    border-radius: 99px;
    transition: width 0.5s ease;
}

.uv-prog-bar.uv-prog-accent { background: var(--brand-accent); }

.uv-prog-val {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-main);
    min-width: 50px;
    text-align: right;
}

/* ── Access / Pricing ── */
.uv-access-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
}

.uv-access-card {
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.2rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: flex-start;
    position: relative;
    transition: box-shadow 0.2s, border-color 0.2s;
}

.uv-access-card:hover {
    border-color: var(--brand-secondary);
    box-shadow: var(--shadow-md);
}

.uv-access-card.uv-access-featured {
    border-color: #10b981;
    background: linear-gradient(135deg, #ecfdf5 0%, #f0fdf4 100%);
}

.uv-best-value {
    position: absolute;
    top: 10px;
    right: -28px;
    background: #10b981;
    color: #fff;
    font-size: 0.65rem;
    font-weight: 700;
    padding: 3px 36px;
    transform: rotate(45deg);
    letter-spacing: 0.5px;
    text-transform: uppercase;
    overflow: hidden;
}

.uv-access-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: #fff;
}

.uv-access-icon.icon-blue   { background: linear-gradient(135deg, #2563eb, #1d4ed8); }
.uv-access-icon.icon-purple { background: linear-gradient(135deg, #8b5cf6, #7c3aed); }
.uv-access-icon.icon-cyan   { background: linear-gradient(135deg, #06b6d4, #0891b2); }
.uv-access-icon.icon-green  { background: linear-gradient(135deg, #10b981, #059669); }

.uv-access-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-main);
}

.uv-access-price {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 0.25rem;
}

.uv-price-old {
    text-decoration: line-through;
    color: var(--text-light);
    font-size: 0.85rem;
    margin-right: 0.35rem;
    font-weight: 400;
}

.uv-price-now { color: #dc2626; }

.uv-access-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    font-size: 0.82rem;
    font-weight: 600;
    padding: 0.55rem 1rem;
    border-radius: 7px;
    border: none;
    cursor: pointer;
    width: 100%;
    transition: all 0.2s;
    text-decoration: none;
}

.uv-access-btn.btn-primary {
    background: var(--brand-primary);
    color: #fff;
}
.uv-access-btn.btn-primary:hover {
    background: var(--brand-hover);
    color: #fff;
    text-decoration: none;
}

.uv-access-btn.btn-outline-primary {
    background: transparent;
    color: var(--brand-primary);
    border: 2px solid var(--brand-primary);
}
.uv-access-btn.btn-outline-primary:hover {
    background: var(--brand-primary);
    color: #fff;
    text-decoration: none;
}

.uv-access-btn.btn-success {
    background: #10b981;
    color: #fff;
}
.uv-access-btn.btn-success:hover {
    background: #059669;
    color: #fff;
}

.uv-access-btn.btn-disabled {
    background: var(--border);
    color: var(--text-muted);
    cursor: not-allowed;
}

/* ── Related courses ── */
.uv-related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 0.75rem;
}

.uv-related-card {
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    text-decoration: none;
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    transition: all 0.2s;
}

.uv-related-card:hover {
    border-color: var(--brand-primary);
    background: var(--surface);
    text-decoration: none;
    color: var(--text-main);
}

.uv-related-icon {
    font-size: 1.3rem;
    color: var(--brand-secondary);
}

.uv-related-name {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
    line-height: 1.4;
}

.uv-related-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

/* ── Discussions ── */
.uv-discuss-form {
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1.2rem;
}

.uv-discuss-input {
    width: 100%;
    padding: 0.7rem 1rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.9rem;
    resize: vertical;
    transition: border-color 0.2s;
    min-height: 80px;
}

.uv-discuss-input:focus {
    outline: none;
    border-color: var(--brand-secondary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.uv-btn-post {
    margin-top: 0.75rem;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    font-weight: 600;
    padding: 0.55rem 1.2rem;
    background: var(--brand-primary);
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.2s;
}

.uv-btn-post:hover { background: var(--brand-hover); }

.uv-auth-notice {
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.8rem 1rem;
    font-size: 0.88rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.uv-auth-notice a { color: var(--brand-secondary); font-weight: 600; }

.uv-discussions-list { display: flex; flex-direction: column; gap: 0.8rem; }

.uv-discuss-item {
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    transition: box-shadow 0.2s;
}

.uv-discuss-item:hover { box-shadow: var(--shadow-sm); }

.uv-discuss-item.uv-blurred {
    opacity: 0.45;
    filter: blur(1.5px);
    pointer-events: none;
    user-select: none;
}

.uv-discuss-meta {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 0.6rem;
}

.uv-discuss-meta strong {
    font-size: 0.88rem;
    color: var(--text-main);
}

.uv-discuss-meta small { font-size: 0.75rem; color: var(--text-light); }

.uv-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.uv-reply-count {
    font-size: 0.72rem;
    font-weight: 600;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 0.15rem 0.55rem;
    border-radius: 20px;
}

.uv-discuss-body {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 0.6rem;
}

.uv-btn-replies {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--brand-primary);
    background: rgba(34, 47, 110, 0.07);
    border: 1px solid rgba(34, 47, 110, 0.15);
    border-radius: 20px;
    padding: 0.3rem 0.8rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    transition: all 0.15s;
}

.uv-btn-replies:hover {
    background: var(--brand-primary);
    color: #fff;
}

.uv-replies-wrap {
    margin-top: 0.8rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.8rem;
    border-left: 3px solid var(--brand-secondary);
}

.uv-reply {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.85rem;
}

.uv-reply:last-child { border-bottom: none; }

.uv-reply strong { color: var(--text-main); }

.uv-reply small {
    color: var(--text-light);
    font-size: 0.75rem;
    margin-left: 0.4rem;
}

.uv-reply p {
    margin: 0.3rem 0 0;
    color: var(--text-muted);
}

.uv-reply-form {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.uv-reply-input {
    flex: 1;
    padding: 0.5rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 0.85rem;
}

.uv-reply-input:focus {
    outline: none;
    border-color: var(--brand-secondary);
}

.uv-reply-btn {
    padding: 0.5rem 1rem;
    background: var(--brand-primary);
    color: #fff;
    border: none;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.uv-reply-btn:hover { background: var(--brand-hover); }

.uv-upgrade-notice {
    text-align: center;
    padding: 1rem;
    border-top: 1px solid var(--border);
    margin-top: 0.5rem;
}

.uv-btn-upgrade-full {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.88rem;
    font-weight: 600;
    padding: 0.6rem 1.4rem;
    background: var(--brand-accent);
    color: #000;
    border-radius: 6px;
    text-decoration: none;
    border-bottom: 3px solid #c9a000;
    transition: background 0.2s;
}

.uv-btn-upgrade-full:hover {
    background: #f0ca00;
    color: #000;
    text-decoration: none;
}

/* ── Empty state ── */
.uv-empty {
    text-align: center;
    padding: 2.5rem 1rem;
    color: var(--text-muted);
    grid-column: 1 / -1;
}

.uv-empty i {
    font-size: 2.5rem;
    color: var(--border);
    display: block;
    margin-bottom: 0.75rem;
}

.uv-empty h5 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.4rem;
}

.uv-empty p { font-size: 0.85rem; }

/* ── Responsive ── */
@media (max-width: 768px) {
    .uv-unit-title { font-size: 1.3rem; }
    .uv-stats-bar { flex-wrap: wrap; }
    .uv-stat { padding: 0.6rem 0.8rem; font-size: 0.8rem; }
    .uv-topics-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
    .uv-mats-grid { grid-template-columns: 1fr; }
    .uv-related-grid { grid-template-columns: repeat(2, 1fr); }
    .uv-hero-actions { flex-wrap: wrap; }
    .uv-access-grid { grid-template-columns: 1fr 1fr; }
    .uv-prog-label { min-width: 110px; }
}

@media (max-width: 480px) {
    .uv-related-grid { grid-template-columns: 1fr; }
    .uv-access-grid { grid-template-columns: 1fr; }
    .uv-prog-row { flex-wrap: wrap; gap: 0.4rem; }
    .uv-prog-val { min-width: auto; }
}

/* ── Premium badge ── */
.uv-premium-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    background: linear-gradient(135deg, #4f46e5, #7c3aed);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 999px;
}

/* ── Free/Included tag ── */
.uv-free-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: #059669;
    font-weight: 700;
    font-size: 0.85rem;
}

/* ── Upgrade banner (free users) ── */
.uv-upgrade-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    background: linear-gradient(135deg, #ede9fe, #dbeafe);
    border: 1px solid #c7d2fe;
    border-radius: 12px;
    padding: 1rem 1.25rem;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
}
.uv-upgrade-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.uv-upgrade-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, #4f46e5, #7c3aed);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.2rem;
    flex-shrink: 0;
}
.uv-upgrade-title {
    font-weight: 700;
    color: #1e293b;
    font-size: 1rem;
}
.uv-upgrade-sub {
    color: #475569;
    font-size: 0.85rem;
    margin-top: 2px;
}
.uv-upgrade-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: linear-gradient(135deg, #4f46e5, #7c3aed);
    color: #fff;
    font-weight: 700;
    font-size: 0.875rem;
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
    white-space: nowrap;
    transition: opacity .2s;
}
.uv-upgrade-btn:hover { opacity: .88; color: #fff; text-decoration: none; }

/* ── Locked cards (free users) ── */
.uv-locked-card {
    position: relative;
    overflow: hidden;
}
.uv-lock-overlay {
    position: absolute;
    top: 8px;
    right: 10px;
    color: #94a3b8;
    font-size: 1rem;
}

/* ── Exam paper cards ── */
.uv-papers-loading { color:#94a3b8; font-size:.9rem; padding:.5rem 0; }
.uv-ep-card {
    display:flex; align-items:center; gap:1rem;
    padding:.9rem 1rem; border:1px solid var(--border);
    border-radius:10px; margin-bottom:.6rem;
    transition:box-shadow .2s, border-color .2s;
    background:var(--card);
}
.uv-ep-card:hover { box-shadow:0 4px 16px rgba(0,0,0,.08); border-color:#a5b4fc; }
.uv-ep-locked { opacity:.75; }
.uv-ep-icon { width:40px; height:40px; background:linear-gradient(135deg,#4f46e5,#7c3aed); border-radius:9px; display:flex; align-items:center; justify-content:center; color:#fff; font-size:1.1rem; flex-shrink:0; }
.uv-ep-info { flex:1; min-width:0; }
.uv-ep-title { font-weight:700; font-size:.92rem; color:var(--text); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.uv-ep-meta { font-size:.78rem; color:#94a3b8; margin-top:2px; }
.uv-ep-actions { display:flex; gap:.4rem; flex-shrink:0; }
.uv-ep-btn { display:inline-flex; align-items:center; gap:5px; padding:7px 14px; border-radius:7px; font-size:.8rem; font-weight:600; text-decoration:none; transition:opacity .2s; white-space:nowrap; }
.uv-ep-view-btn { background:#ede9fe; color:#4f46e5; }
.uv-ep-view-btn:hover { background:#ddd6fe; color:#4f46e5; }
.uv-ep-dl-btn { background:#4f46e5; color:#fff; }
.uv-ep-dl-btn:hover { opacity:.88; color:#fff; }
.uv-ep-locked-btn { background:#f1f5f9; color:#64748b; }
.uv-ep-locked-btn:hover { background:#e2e8f0; color:#475569; }

/* ── Dark mode ── */
body.study-dark-mode .uv-ep-card { background:#1e293b !important; border-color:#334155 !important; }
body.study-dark-mode .uv-ep-title { color:#f1f5f9 !important; }
body.study-dark-mode .uv-ep-view-btn { background:#312e81 !important; color:#a5b4fc !important; }
body.study-dark-mode .uv-ep-locked-btn { background:#162032 !important; color:#64748b !important; }
body.study-dark-mode .uv-upgrade-banner {
    background: #1e293b !important;
    border-color: #334155 !important;
}
body.study-dark-mode .uv-upgrade-title { color: #f1f5f9 !important; }
body.study-dark-mode .uv-upgrade-sub { color: #94a3b8 !important; }
body.study-dark-mode .uv-free-tag { color: #34d399 !important; }