/* =============================================================
   PYQ Library Styles — Previous Year Questions Browser
   Dark-mode-first with [data-theme="dark"] toggle support
   ============================================================= */

/* ===== Theme Variables (Light — Root Default) ===== */
:root {
    --bg: #f0f2f5;
    --card-bg: #ffffff;
    --text: #1a1a2e;
    --text-secondary: #666;
    --border: #e0e0e0;
    --accent: #f0a500;
    --accent-hover: #d4920a;
    --accent-light: rgba(240, 165, 0, 0.1);
    --green: #27ae60;
    --green-light: rgba(39, 174, 96, 0.1);
    --blue: #3498db;
    --red: #e74c3c;
    --purple: #9b59b6;
    --orange: #e67e22;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
    --radius: 10px;
    --radius-lg: 16px;
    --folder-bg: rgba(240, 165, 0, 0.05);
    --exam-hover: rgba(240, 165, 0, 0.08);
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(255, 255, 255, 0.3);
    --ring-track: #e0e0e0;
    --year-dim: rgba(0, 0, 0, 0.04);
    --year-partial: rgba(240, 165, 0, 0.18);
    --year-complete: rgba(39, 174, 96, 0.2);
}

/* ===== Dark Theme Overrides ===== */
[data-theme="dark"] {
    --bg: #0f0f1a;
    --card-bg: #1a1a2e;
    --text: #e0e0e8;
    --text-secondary: #999;
    --border: #2a2a3e;
    --accent: #f0a500;
    --accent-hover: #ffc048;
    --accent-light: rgba(240, 165, 0, 0.12);
    --green: #2ecc71;
    --green-light: rgba(46, 204, 113, 0.12);
    --blue: #5dade2;
    --red: #e74c3c;
    --purple: #bb8fce;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --folder-bg: rgba(240, 165, 0, 0.06);
    --exam-hover: rgba(240, 165, 0, 0.08);
    --glass-bg: rgba(26, 26, 46, 0.7);
    --glass-border: rgba(255, 255, 255, 0.08);
    --ring-track: #2a2a3e;
    --year-dim: rgba(255, 255, 255, 0.04);
    --year-partial: rgba(240, 165, 0, 0.25);
    --year-complete: rgba(46, 204, 113, 0.25);
}

/* ===== Reset & Base ===== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    transition: background 0.3s, color 0.3s;
}

/* ===== Background Glows ===== */
.pyq-bg-glows {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    z-index: -1;
    pointer-events: none;
}

.pyq-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
    animation: pyqFloat 20s ease-in-out infinite alternate;
}

[data-theme="dark"] .pyq-glow {
    opacity: 0.15;
}

.pyq-glow-1 {
    top: -10%;
    right: -5%;
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, var(--accent), transparent 70%);
}

.pyq-glow-2 {
    bottom: -20%;
    left: -10%;
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, var(--blue), transparent 70%);
    animation-delay: -10s;
}

@keyframes pyqFloat {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(-5%, 5%) scale(1.1); }
    100% { transform: translate(5%, -5%) scale(0.9); }
}

/* ===== Animations ===== */
@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes pyqFadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pyqBarGrow {
    from { width: 0; }
}

@keyframes pyqPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.04); }
}

@keyframes pyqGlow {
    0%, 100% { box-shadow: 0 0 15px rgba(240, 165, 0, 0.15); }
    50% { box-shadow: 0 0 25px rgba(240, 165, 0, 0.3); }
}

/* ===== Sticky Header ===== */
.pyq-header {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 40%, #0f3460 100%);
    padding: 22px 30px;
    color: #fff;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
}

.pyq-header-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: wrap;
}

.pyq-header h1 {
    font-size: 22px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
}

.pyq-header h1 span {
    font-size: 26px;
}

.pyq-nav-links {
    display: flex;
    gap: 16px;
    align-items: center;
}

.pyq-nav-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

.pyq-nav-links a:hover {
    color: #fff;
}

/* ===== Analytics Dashboard ===== */
.pyq-analytics {
    max-width: 1200px;
    margin: 24px auto 0;
    padding: 0 20px;
    animation: pyqFadeIn 0.5s ease-out both;
}

.pyq-analytics-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.pyq-analytics-grid {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* --- Stat Cards Row --- */
.pyq-stat-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.pyq-stat-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    box-shadow: var(--shadow);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    position: relative;
    overflow: hidden;
    animation: pyqFadeIn 0.5s ease-out both;
}

.pyq-stat-card:nth-child(1) { animation-delay: 0.05s; }
.pyq-stat-card:nth-child(2) { animation-delay: 0.10s; }
.pyq-stat-card:nth-child(3) { animation-delay: 0.15s; }
.pyq-stat-card:nth-child(4) { animation-delay: 0.20s; }

.pyq-stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), #f9ca24);
    opacity: 0;
    transition: opacity 0.3s;
}

.pyq-stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.pyq-stat-card:hover::before {
    opacity: 1;
}

/* Color accents per stat card */
.pyq-stat-total .pyq-stat-value { color: var(--blue); -webkit-text-fill-color: var(--blue); }
.pyq-stat-attempted .pyq-stat-value { color: var(--green); -webkit-text-fill-color: var(--green); }
.pyq-stat-remaining .pyq-stat-value { color: var(--orange); -webkit-text-fill-color: var(--orange); }
.pyq-stat-accuracy .pyq-stat-value { color: var(--accent); -webkit-text-fill-color: var(--accent); }

.pyq-stat-icon {
    font-size: 22px;
    margin-bottom: 4px;
}

.pyq-stat-value {
    font-size: 30px;
    font-weight: 800;
    letter-spacing: -0.5px;
    line-height: 1.1;
    background: linear-gradient(135deg, var(--accent), #f9ca24);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.pyq-stat-label {
    font-size: 11px;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

/* --- Analytics Detail Row (Ring + Subject) --- */
.pyq-analytics-detail {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 16px;
    align-items: start;
}

/* --- Completion Ring --- */
.pyq-ring-container {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 24px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    box-shadow: var(--shadow);
    animation: pyqFadeIn 0.5s ease-out 0.25s both;
}

.pyq-ring-container h3,
.pyq-subject-container h3,
.pyq-year-container h3 {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-bottom: 4px;
}

.pyq-ring {
    position: relative;
    width: 130px;
    height: 130px;
    border-radius: 50%;
    background: conic-gradient(var(--accent) 0% 0%, var(--ring-track) 0% 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.8s ease;
    animation: pyqGlow 3s ease-in-out infinite;
}

.pyq-ring-center {
    width: 96px;
    height: 96px;
    border-radius: 50%;
    background: var(--card-bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: background 0.3s;
}

.pyq-ring-pct {
    font-size: 26px;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
}

.pyq-ring-label {
    font-size: 10px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 2px;
}

/* --- Subject Progress --- */
.pyq-subject-container {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow);
    animation: pyqFadeIn 0.5s ease-out 0.3s both;
}

.pyq-subject-progress {
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-height: 200px;
    overflow-y: auto;
    padding-right: 4px;
    scrollbar-width: thin;
    scrollbar-color: rgba(240, 165, 0, 0.3) transparent;
}

.pyq-subject-bar {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.pyq-subject-bar-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.pyq-subject-name {
    font-size: 12px;
    font-weight: 600;
    color: var(--text);
}

.pyq-subject-pct {
    font-size: 11px;
    font-weight: 700;
    color: var(--accent);
}

.pyq-subject-bar-track {
    height: 6px;
    background: var(--ring-track);
    border-radius: 3px;
    overflow: hidden;
}

.pyq-subject-bar-fill {
    height: 100%;
    border-radius: 3px;
    background: linear-gradient(90deg, var(--accent), #f9ca24);
    transition: width 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    animation: pyqBarGrow 1s ease-out both;
}

.pyq-empty-hint {
    font-size: 12px;
    color: var(--text-secondary);
    text-align: center;
    padding: 16px 8px;
    font-style: italic;
}

/* --- Year-wise Completion Grid --- */
.pyq-year-container {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow);
    animation: pyqFadeIn 0.5s ease-out 0.35s both;
}

.pyq-year-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
    gap: 8px;
}

.pyq-year-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 10px 6px 8px;
    border-radius: 10px;
    background: var(--year-dim);
    border: 1px solid transparent;
    transition: all 0.25s ease;
    cursor: default;
}

.pyq-year-label {
    font-size: 14px;
    font-weight: 800;
    color: var(--text-secondary);
    line-height: 1;
}

.pyq-year-pct {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-secondary);
    margin-top: 3px;
}

.pyq-year-count {
    font-size: 9px;
    color: var(--text-secondary);
    opacity: 0.7;
    margin-top: 1px;
}

.pyq-year-cell:hover {
    transform: translateY(-2px);
}

/* Not started */
.pyq-year-cell.not-started {
    background: var(--year-dim);
}

.pyq-year-cell.not-started:hover {
    border-color: var(--border);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

/* Partial — amber */
.pyq-year-cell.partial {
    background: var(--year-partial);
    border-color: rgba(240, 165, 0, 0.25);
}

.pyq-year-cell.partial .pyq-year-label,
.pyq-year-cell.partial .pyq-year-pct {
    color: var(--accent);
}

.pyq-year-cell.partial:hover {
    box-shadow: 0 0 14px rgba(240, 165, 0, 0.3);
    border-color: var(--accent);
}

/* Complete — green */
.pyq-year-cell.complete {
    background: var(--year-complete);
    border-color: rgba(39, 174, 96, 0.3);
}

.pyq-year-cell.complete .pyq-year-label,
.pyq-year-cell.complete .pyq-year-pct {
    color: var(--green);
}

.pyq-year-cell.complete:hover {
    box-shadow: 0 0 14px rgba(39, 174, 96, 0.3);
    border-color: var(--green);
}

/* ===== Search & Filter Controls ===== */
.pyq-controls {
    max-width: 1200px;
    margin: 20px auto;
    padding: 0 20px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
}

.pyq-search {
    flex: 1;
    min-width: 250px;
    padding: 10px 16px 10px 40px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    background: var(--card-bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%23999' viewBox='0 0 16 16'%3E%3Cpath d='M11.742 10.344a6.5 6.5 0 1 0-1.397 1.398h-.001l3.85 3.85a1 1 0 0 0 1.415-1.414l-3.85-3.85zm-5.242.656a5 5 0 1 1 0-10 5 5 0 0 1 0 10z'/%3E%3C/svg%3E") 14px center no-repeat;
    color: var(--text);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.pyq-search:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(240, 165, 0, 0.12);
}

.pyq-filter-btn {
    padding: 9px 18px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--card-bg);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.pyq-filter-btn:hover,
.pyq-filter-btn.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.pyq-stats-text {
    font-size: 13px;
    color: var(--text-secondary);
    padding: 0 4px;
}

/* ===== Main Content ===== */
.pyq-content {
    max-width: 1200px;
    margin: 0 auto 40px;
    padding: 0 20px;
}

/* ===== Source Card ===== */
.pyq-source-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 16px;
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: box-shadow 0.2s;
}

.pyq-source-card:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
}

[data-theme="dark"] .pyq-source-card:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
}

.pyq-source-header {
    padding: 16px 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    user-select: none;
    transition: background 0.15s;
}

.pyq-source-header:hover {
    background: var(--folder-bg);
}

.pyq-source-chevron {
    font-size: 12px;
    transition: transform 0.25s ease;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.pyq-source-card.open .pyq-source-chevron {
    transform: rotate(90deg);
}

.pyq-source-icon {
    font-size: 22px;
    flex-shrink: 0;
}

.pyq-source-info {
    flex: 1;
}

.pyq-source-name {
    font-size: 16px;
    font-weight: 700;
}

.pyq-source-meta {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 2px;
}

.pyq-source-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: rgba(240, 165, 0, 0.12);
    color: var(--accent);
}

.pyq-source-completion-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 700;
    background: rgba(149, 165, 166, 0.12);
    color: #7f8c8d;
    white-space: nowrap;
    margin-right: 4px;
}

.pyq-source-completion-badge.partial {
    background: rgba(240, 165, 0, 0.12);
    color: var(--accent);
}

.pyq-source-completion-badge.complete {
    background: rgba(39, 174, 96, 0.15);
    color: var(--green);
}

.pyq-source-progress-bar {
    height: 3px;
    background: var(--border);
    width: 100%;
    overflow: hidden;
}

.pyq-source-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--green));
    border-radius: 0 3px 3px 0;
    transition: width 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.pyq-source-body {
    display: none;
    border-top: 1px solid var(--border);
}

.pyq-source-card.open .pyq-source-body {
    display: block;
}

/* ===== Folder Tree ===== */
.pyq-tree-folder {
    border-bottom: 1px solid var(--border);
}

.pyq-tree-folder:last-child {
    border-bottom: none;
}

.pyq-folder-header {
    padding: 10px 20px 10px 28px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    user-select: none;
    transition: background 0.15s;
}

.pyq-folder-header:hover {
    background: var(--folder-bg);
}

.pyq-folder-chevron {
    font-size: 10px;
    transition: transform 0.2s;
    color: var(--text-secondary);
}

.pyq-tree-folder.open > .pyq-folder-header .pyq-folder-chevron {
    transform: rotate(90deg);
}

.pyq-folder-icon {
    font-size: 16px;
}

.pyq-folder-children {
    display: none;
    padding-left: 16px;
}

.pyq-tree-folder.open > .pyq-folder-children {
    display: block;
}

.pyq-folder-completion {
    font-size: 10px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 10px;
    background: rgba(149, 165, 166, 0.1);
    color: #7f8c8d;
    margin-left: auto;
    white-space: nowrap;
}

.pyq-folder-completion.partial {
    background: rgba(240, 165, 0, 0.1);
    color: var(--accent);
}

.pyq-folder-completion.complete {
    background: rgba(39, 174, 96, 0.12);
    color: var(--green);
}

/* ===== Exam Item ===== */
.pyq-exam-item {
    display: flex;
    align-items: center;
    padding: 10px 20px 10px 36px;
    gap: 10px;
    cursor: pointer;
    transition: background 0.15s;
    border-bottom: 1px solid rgba(0, 0, 0, 0.03);
}

[data-theme="dark"] .pyq-exam-item {
    border-bottom-color: rgba(255, 255, 255, 0.03);
}

.pyq-exam-item:hover {
    background: var(--exam-hover);
}

.pyq-exam-item:last-child {
    border-bottom: none;
}

.pyq-exam-item-icon {
    font-size: 14px;
    color: var(--accent);
    flex-shrink: 0;
}

.pyq-exam-item-name {
    flex: 1;
    font-size: 13.5px;
    font-weight: 500;
    color: var(--text);
    line-height: 1.3;
}

.pyq-exam-item-meta {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-shrink: 0;
    margin-left: auto;
}

.pyq-exam-meta-tag {
    font-size: 11px;
    color: var(--text-secondary);
    background: rgba(0, 0, 0, 0.04);
    padding: 3px 8px;
    border-radius: 4px;
    white-space: nowrap;
}

[data-theme="dark"] .pyq-exam-meta-tag {
    background: rgba(255, 255, 255, 0.06);
}

.pyq-exam-start-btn {
    padding: 5px 14px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    white-space: nowrap;
}

.pyq-exam-start-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.pyq-exam-result-btn {
    padding: 5px 10px;
    background: rgba(240, 165, 0, 0.15);
    color: var(--accent);
    border: 1px solid rgba(240, 165, 0, 0.3);
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s, border-color 0.2s;
    white-space: nowrap;
    line-height: 1;
}

.pyq-exam-result-btn:hover {
    background: rgba(240, 165, 0, 0.25);
    border-color: rgba(240, 165, 0, 0.5);
    transform: translateY(-1px);
}

.pyq-exam-attempts {
    display: flex;
    gap: 2px;
    align-items: center;
}

.pyq-exam-tick {
    cursor: pointer;
    display: inline-block;
    font-size: 14px;
    color: var(--green);
    transition: transform 0.15s ease;
    border-radius: 4px;
}

.pyq-exam-tick:hover {
    transform: scale(1.35);
    filter: drop-shadow(0 0 3px rgba(39, 174, 96, 0.5));
}

/* ===== Loading & Empty States ===== */
.pyq-loading {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
    font-size: 16px;
}

.pyq-loading .spinner {
    display: inline-block;
    width: 32px;
    height: 32px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 12px;
}

.pyq-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
}

/* ===== Scroll to Top ===== */
.pyq-scroll-top-btn {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    border: none;
    font-size: 20px;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(240, 165, 0, 0.35);
    display: none;
    align-items: center;
    justify-content: center;
    transition: opacity 0.3s, transform 0.2s;
    z-index: 50;
}

.pyq-scroll-top-btn.visible {
    display: flex;
}

.pyq-scroll-top-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(240, 165, 0, 0.45);
}

/* ===== Dark Mode Toggle ===== */
.pyq-dark-toggle {
    background: none;
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: rgba(255, 255, 255, 0.9);
    padding: 6px 10px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.2s;
}

.pyq-dark-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* ===== Index Timestamp ===== */
.pyq-index-ts {
    font-size: 11px;
    color: var(--text-secondary);
    padding: 3px 8px;
    cursor: help;
    white-space: nowrap;
}

.pyq-index-ts.stale {
    color: var(--accent);
    font-weight: 600;
    animation: pyqPulse 2s ease-in-out infinite;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .pyq-analytics-detail {
        grid-template-columns: 1fr 1fr;
    }

    .pyq-ring-container {
        grid-column: 1 / -1;
    }
}

@media (max-width: 768px) {
    .pyq-header {
        padding: 16px 15px;
    }

    .pyq-header h1 {
        font-size: 18px;
    }

    .pyq-nav-links {
        gap: 10px;
    }

    .pyq-nav-links a {
        font-size: 13px;
    }

    .pyq-stat-cards {
        grid-template-columns: repeat(2, 1fr);
    }

    .pyq-analytics-detail {
        grid-template-columns: 1fr;
    }

    .pyq-ring-container {
        grid-column: auto;
    }

    .pyq-controls {
        padding: 0 12px;
    }

    .pyq-search {
        min-width: 100%;
    }

    .pyq-content {
        padding: 0 12px;
    }

    .pyq-source-header {
        padding: 12px 14px;
    }

    .pyq-exam-item {
        padding: 10px 14px 10px 24px;
        flex-wrap: wrap;
    }

    .pyq-exam-item-meta {
        width: 100%;
        justify-content: flex-start;
        margin-top: 4px;
    }

    .pyq-folder-header {
        padding-left: 18px;
    }
}

@media (max-width: 480px) {
    .pyq-stat-cards {
        grid-template-columns: 1fr 1fr;
    }

    .pyq-header-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .pyq-year-grid {
        grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
    }
}