:root {
    --c-surface: #FEFEFF;
    --c-surface-soft: #f8fafc;
    --c-border: #e5e7eb;
    --c-border-soft: #eef0f3;
    --c-text: #4C4948;
    --c-text-soft: #6b7280;
    --c-text-muted: #9ca3af;
    --c-primary: #7D929F;
    --c-primary-hover: #6B808C;
    --c-primary-soft: #EDF1F3;
    --c-success: #10b981;
    --c-success-hover: #059669;
    --c-danger: #f67c7c;
    --c-bg: #F7F9FE;
    --c-overlay: rgba(0, 0, 0, 0.45);
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.06), 0 2px 4px rgba(15, 23, 42, 0.04);
    --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.10), 0 4px 8px rgba(15, 23, 42, 0.05);
    --shadow-xl: 0 24px 48px rgba(15, 23, 42, 0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Dark Mode ===== */
[data-theme="dark"] {
    --c-surface: #1e293b;
    --c-surface-soft: #0f172a;
    --c-border: #334155;
    --c-border-soft: #1e293b;
    --c-text: #e2e8f0;
    --c-text-soft: #94a3b8;
    --c-text-muted: #64748b;
    --c-primary: #94a3b8;
    --c-primary-hover: #b0c4d8;
    --c-primary-soft: #1e293b;
    --c-success: #34d399;
    --c-success-hover: #10b981;
    --c-danger: #f87171;
    --c-bg: #0f172a;
    --c-overlay: rgba(0, 0, 0, 0.7);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3), 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.4), 0 4px 8px rgba(0, 0, 0, 0.25);
    --shadow-xl: 0 24px 48px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--c-bg);
    color: var(--c-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 28px 24px 60px;
}

/* ===== Header ===== */
header {
    text-align: center;
    margin-bottom: 28px;
    padding: 32px 24px;
    background: var(--c-surface);
    color: var(--c-text);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--c-border-soft);
}

h1 {
    font-size: 2em;
    margin-bottom: 8px;
    color: var(--c-text);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

h1 svg { color: var(--c-primary); flex-shrink: 0; }

.header-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    position: relative;
}

.theme-toggle {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--c-border);
    border-radius: 50%;
    background: var(--c-surface);
    color: var(--c-text-soft);
    cursor: pointer;
    transition: all 0.25s var(--ease);
}

.theme-toggle:hover {
    background: var(--c-primary-soft);
    color: var(--c-primary);
    border-color: var(--c-primary);
    transform: translateY(-50%) scale(1.08);
}

.theme-toggle .sun-icon { display: block; }
.theme-toggle .moon-icon { display: none; }

[data-theme="dark"] .theme-toggle .sun-icon { display: none; }
[data-theme="dark"] .theme-toggle .moon-icon { display: block; }

.subtitle {
    font-size: 1.05em;
    color: var(--c-text-soft);
    font-weight: 400;
}

/* ===== Panels ===== */
.control-panel,
.progress-section,
.preview-section,
.print-section {
    background: var(--c-surface);
    padding: 28px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: 20px;
    border: 1px solid var(--c-border-soft);
    transition: box-shadow 0.3s var(--ease);
}

.control-panel:hover,
.progress-section:hover,
.preview-section:hover { box-shadow: var(--shadow-lg); }

h3 {
    font-size: 1.15em;
    margin-bottom: 16px;
    color: var(--c-text);
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
}

h3 svg { color: var(--c-primary); flex-shrink: 0; }

/* ===== Upload area ===== */
.upload-area {
    border: 2px dashed var(--c-border);
    border-radius: var(--radius-lg);
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s var(--ease);
    background: var(--c-surface-soft);
}

.upload-area:hover {
    background: var(--c-primary-soft);
    border-color: var(--c-primary);
    transform: translateY(-1px);
}

.upload-area.dragover {
    background: var(--c-primary-soft);
    border-color: var(--c-primary);
    border-style: solid;
    transform: scale(1.01);
    box-shadow: 0 8px 24px rgba(56, 134, 202, 0.15);
}

.upload-icon {
    font-size: 48px;
    margin-bottom: 16px;
    color: var(--c-primary);
    display: flex;
    justify-content: center;
}

.upload-text {
    font-size: 1.15em;
    color: var(--c-text);
    margin-bottom: 6px;
    font-weight: 600;
}

.upload-hint { color: var(--c-text-soft); font-size: 0.9em; }

input[type="file"] { display: none; }

/* ===== Settings ===== */
.settings {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-top: 24px;
}

.setting-group { display: flex; flex-direction: column; gap: 8px; }

.setting-group label {
    font-weight: 600;
    color: var(--c-text);
    font-size: 0.9em;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}

.setting-group small {
    color: var(--c-text-muted);
    font-size: 0.8em;
}

.setting-group input[type="range"],
.setting-group input[type="number"],
.setting-group select {
    padding: 10px 12px;
    border: 1.5px solid var(--c-border);
    border-radius: var(--radius-sm);
    font-size: 0.95em;
    transition: all 0.2s var(--ease);
    background: var(--c-surface);
    color: var(--c-text);
    font-family: inherit;
}

.setting-group input[type="range"] {
    padding: 0;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    background: linear-gradient(to right, var(--c-primary) 0%, var(--c-primary) var(--range-pct, 25%), var(--c-border) var(--range-pct, 25%), var(--c-border) 100%);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

.setting-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--c-surface);
    border: 2px solid var(--c-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(125, 146, 159, 0.3);
    transition: transform 0.15s var(--ease);
}

.setting-group input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.15); }
.setting-group input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--c-surface);
    border: 2px solid var(--c-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(125, 146, 159, 0.3);
}

.setting-group select {
    cursor: pointer;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 12px;
    padding-right: 36px;
    appearance: none;
    -webkit-appearance: none;
}

.setting-group input:focus,
.setting-group select:focus {
    outline: none;
    border-color: var(--c-primary);
    box-shadow: 0 0 0 3px rgba(125, 146, 159, 0.12);
}

.range-value {
    text-align: right;
    color: var(--c-primary);
    font-weight: 600;
    font-size: 0.85em;
}

/* ===== Quality badge ===== */
.quality-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 0.78em;
    font-weight: 600;
    margin-left: 8px;
    letter-spacing: 0.02em;
}

.quality-high { background: #d1fae5; color: #065f46; }
.quality-medium { background: #fef3c7; color: #92400e; }
.quality-low { background: #fee2e2; color: #991b1b; }

/* ===== Buttons ===== */
.btn {
    padding: 11px 22px;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.95em;
    font-weight: 600;
    transition: all 0.25s var(--ease);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: inherit;
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.15);
    opacity: 0;
    transition: opacity 0.2s var(--ease);
    pointer-events: none;
}

.btn:hover::after { opacity: 1; }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none !important; }
.btn:disabled::after { display: none; }

.btn-primary {
    background: linear-gradient(135deg, var(--c-primary) 0%, #7D929F 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(125, 146, 159, 0.25);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(125, 146, 159, 0.35);
}

.btn-secondary {
    background: var(--c-surface-soft);
    color: var(--c-text);
    border: 1px solid var(--c-border);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--c-primary-soft);
    border-color: var(--c-primary);
    color: var(--c-primary);
    transform: translateY(-1px);
}

.btn-success {
    background: linear-gradient(135deg, var(--c-success) 0%, #34d399 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.25);
}

.btn-success:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(16, 185, 129, 0.4);
}

.btn-danger {
    background: linear-gradient(135deg, var(--c-danger) 0%, #f87171 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(239, 68, 68, 0.25);
}

.btn-danger:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(239, 68, 68, 0.4);
}

.actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 24px;
    justify-content: center;
}

/* ===== Progress ===== */
.progress-section { display: none; }
.progress-section.active {
    display: block;
    animation: slideDown 0.4s var(--ease);
}

.progress-bar-container {
    background: var(--c-surface-soft);
    border-radius: 999px;
    overflow: hidden;
    height: 28px;
    margin: 16px 0;
    border: 1px solid var(--c-border);
    position: relative;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.06);
}

.progress-bar {
    height: 100%;
    background: linear-gradient(135deg, #4f7a8c 0%, #6b9cb0 40%, #7D929F 70%, #4f7a8c 100%);
    background-size: 300% 100%;
    width: 0%;
    transition: width 0.3s ease-out;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 0.85em;
    border-radius: 999px;
    position: relative;
    overflow: hidden;
    min-width: 0;
    letter-spacing: 0.02em;
}

.progress-bar::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.25) 50%, transparent 100%);
    background-size: 200% 100%;
    animation: progressShine 1.8s ease-in-out infinite;
}

@keyframes progressShine {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.progress-bar.complete {
    background: linear-gradient(135deg, #3d9f6e 0%, #5bbd8a 100%);
}

.progress-bar.complete::after {
    animation: none;
    opacity: 0;
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    margin-top: 18px;
}

.stat-card {
    background: var(--c-surface-soft);
    padding: 16px 12px;
    border-radius: var(--radius-md);
    text-align: center;
    border: 1px solid var(--c-border-soft);
    transition: all 0.25s var(--ease);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--c-primary);
}

.stat-value {
    font-size: 1.6em;
    font-weight: 700;
    background: linear-gradient(135deg, var(--c-primary) 0%, #7D929F 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}

.stat-label { color: var(--c-text-soft); font-size: 0.85em; margin-top: 4px; }

/* ===== Preview ===== */
.preview-section { display: none; }
.preview-section.active {
    display: block;
    animation: slideDown 0.4s var(--ease);
}

.preview-controls {
    display: flex;
    gap: 10px;
    margin-bottom: 18px;
    flex-wrap: wrap;
    align-items: center;
}

.preview-controls > span:first-child {
    font-weight: 600;
    color: var(--c-text-soft);
    font-size: 0.9em;
}

.frame-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 10px;
    max-height: 520px;
    overflow-y: auto;
    padding: 14px;
    background: var(--c-surface-soft);
    border-radius: var(--radius-md);
    border: 1px solid var(--c-border-soft);
}

.frame-grid::-webkit-scrollbar { width: 8px; }
.frame-grid::-webkit-scrollbar-track { background: transparent; }
.frame-grid::-webkit-scrollbar-thumb { background: var(--c-border); border-radius: 4px; }
.frame-grid::-webkit-scrollbar-thumb:hover { background: var(--c-text-muted); }

.frame-item {
    position: relative;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.25s var(--ease);
    box-shadow: var(--shadow-sm);
    border: 2px solid transparent;
}

.frame-item:hover {
    transform: translateY(-3px) scale(1.03);
    z-index: 10;
    box-shadow: var(--shadow-lg);
}

.frame-item img {
    width: 100%;
    height: auto;
    display: block;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    background: var(--c-surface-soft);
}

.frame-number {
    position: absolute;
    top: 6px;
    left: 6px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 2px 8px;
    border-radius: 6px;
    font-size: 0.75em;
    font-weight: 700;
    backdrop-filter: blur(4px);
}

.frame-item.selected {
    border-color: var(--c-success);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

.frame-item.selected::after {
    content: "✓";
    position: absolute;
    top: 6px;
    right: 6px;
    width: 22px;
    height: 22px;
    background: var(--c-success);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75em;
    font-weight: 700;
    box-shadow: 0 2px 6px rgba(16, 185, 129, 0.4);
}

/* ===== Print ===== */
.print-section { display: none; }
.print-section.active {
    display: block;
    animation: slideDown 0.4s var(--ease);
}

.a4-sheet {
    width: 210mm;
    height: 297mm;
    margin: 0 auto 24px;
    background: var(--c-surface);
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
    page-break-after: always;
    border-radius: 4px;
}

.a4-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr 1fr 1fr;
    height: 100%;
    padding: 10mm;
    gap: 5mm;
}

.print-frame {
    border: 1px solid var(--c-border);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: var(--c-surface-soft);
    border-radius: 4px;
}

.print-frame.empty {
    background: repeating-linear-gradient(
        45deg,
        var(--c-surface-soft),
        var(--c-surface-soft) 6px,
        var(--c-border-soft) 6px,
        var(--c-border-soft) 12px
    );
    border-style: dashed;
    border-color: var(--c-border);
}

.print-frame img { max-width: 100%; max-height: 100%; object-fit: contain; }

.print-page-number {
    position: absolute;
    bottom: 5mm;
    right: 10mm;
    font-size: 12px;
    color: var(--c-text-muted);
    font-weight: 600;
}

.print-actions {
    position: sticky;
    bottom: 20px;
    background: var(--c-surface);
    padding: 14px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
    border: 1px solid var(--c-border-soft);
    z-index: 50;
}

.hidden-video { display: none; }
.canvas-hidden { display: none; }

/* ===== Footer ===== */
.site-footer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 24px 16px;
    font-size: 0.88em;
    color: var(--c-text-muted);
}

.site-footer a {
    color: var(--c-primary);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s var(--ease);
}

.site-footer a:hover { color: var(--c-primary-hover); }

.footer-github {
    display: inline-flex;
    align-items: center;
    color: var(--c-text-soft);
    transition: color 0.2s var(--ease);
}

.footer-github:hover { color: var(--c-primary); }

.footer-tip-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--c-text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: 50%;
    transition: all 0.2s var(--ease);
}

.footer-tip-btn:hover {
    color: var(--c-primary);
    background: var(--c-primary-soft);
}

/* ===== Modal ===== */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--c-overlay);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.modal-overlay.active {
    display: flex;
    animation: fadeIn 0.25s var(--ease);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--c-surface);
    border-radius: var(--radius-lg);
    padding: 28px 24px 20px;
    max-width: 400px;
    width: calc(100% - 32px);
    box-shadow: var(--shadow-xl);
    animation: slideUp 0.3s var(--ease);
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px) scale(0.97); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.1em;
    font-weight: 700;
    color: var(--c-text);
    margin-bottom: 16px;
}

.modal-header svg { color: var(--c-primary); }

.modal-body {
    color: var(--c-text-soft);
    font-size: 0.95em;
    line-height: 1.8;
    margin-bottom: 20px;
}

.modal-body p { margin: 6px 0; }

.modal-close-btn {
    width: 100%;
    justify-content: center;
}

.modal-sm { max-width: 340px; }

.modal-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

.modal-actions .btn { min-width: 80px; justify-content: center; }

.btn-danger {
    background: var(--c-danger);
    color: white;
    border: none;
}

.btn-danger:hover {
    filter: brightness(0.9);
}

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(120px);
    background: var(--c-surface);
    color: var(--c-text);
    border: 1px solid var(--c-border);
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95em;
    opacity: 0;
    transition: all 0.4s var(--ease);
    z-index: 1000;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--c-border);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* ===== Animations ===== */
@keyframes slideDown {
    from { opacity: 0; transform: translateY(-12px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-spinner {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2.5px solid rgba(125, 146, 159, 0.2);
    border-radius: 50%;
    border-top-color: var(--c-primary);
    animation: spin 0.8s linear infinite;
}

/* ===== Print media ===== */
@media print {
    @page { size: A4; margin: 0; }
    body { background: white !important; color: black; }
    body * { visibility: hidden; }
    .print-section, .print-section * { visibility: visible; }
    .print-section {
        position: absolute;
        left: 0; top: 0;
        width: 100%;
        padding: 0;
        background: white !important;
        box-shadow: none;
    }
    .a4-sheet {
        box-shadow: none;
        border: none;
        margin: 0;
        page-break-after: always;
        width: 210mm;
        height: 297mm;
    }
    .print-actions { display: none; }
    .print-page-number { color: #333; }
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
    .container { padding: 12px 10px 32px; }
    header { padding: 20px 12px; }
    h1 { font-size: 1.25em; gap: 6px; }
    h1 svg { width: 26px; height: 26px; }
    .header-row { gap: 8px; }
    .theme-toggle { position: static; transform: none; width: 32px; height: 32px; flex-shrink: 0; }
    .theme-toggle:hover { transform: scale(1.08); }
    .subtitle { font-size: 0.85em; }
    .control-panel,
    .progress-section,
    .preview-section,
    .print-section { padding: 14px; }

    .upload-area { padding: 28px 14px; }
    .upload-icon svg { width: 40px; height: 40px; }
    .upload-text { font-size: 1em; }
    .upload-hint { font-size: 0.8em; }

    .settings {
        grid-template-columns: 1fr;
        gap: 14px;
        margin-top: 18px;
    }
    .setting-group input[type="range"] { height: 5px; }
    .setting-group input[type="range"]::-webkit-slider-thumb { width: 16px; height: 16px; }

    .actions {
        gap: 8px;
        margin-top: 18px;
    }
    .actions .btn,
    .print-actions .btn {
        flex: 1 1 45%;
        justify-content: center;
        padding: 10px 14px;
        font-size: 0.88em;
    }

    .progress-bar-container { height: 22px; margin: 12px 0; }
    .progress-bar { font-size: 0.75em; }

    .stats { grid-template-columns: repeat(2, 1fr); gap: 10px; margin-top: 16px; }
    .stat-card { padding: 12px 8px; }
    .stat-value { font-size: 1.3em; }
    .stat-label { font-size: 0.78em; }

    .preview-controls {
        gap: 6px;
        margin-bottom: 12px;
    }
    .preview-controls > span:first-child { display: none; }
    .preview-controls .btn { padding: 6px 10px; font-size: 0.82em; }
    .preview-controls #selectedCount {
        width: 100%;
        margin-left: 0;
        margin-top: 4px;
        font-size: 0.85em;
    }

    .frame-grid {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
        gap: 6px;
        max-height: 400px;
        padding: 10px;
    }
    .frame-number { font-size: 0.68em; padding: 1px 5px; top: 3px; left: 3px; }
    .frame-item.selected::after { font-size: 16px; right: 4px; bottom: 4px; }

    .a4-sheet {
        width: calc(100vw - 28px);
        height: auto;
        aspect-ratio: 210 / 297;
        margin: 0 auto 16px;
    }
    .a4-content {
        padding: 4%;
        gap: 2%;
    }
    .print-frame { border-radius: 2px; }
    .print-page-number {
        font-size: 10px;
        bottom: 2%;
        right: 4%;
    }

    .print-section { padding-bottom: 68px; }
    .print-actions {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        margin: 0;
        border-radius: 0;
        padding: 10px 12px;
        gap: 8px;
        box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.15);
        border: none;
        border-top: 1px solid var(--c-border-soft);
    }
    .print-actions .btn { flex: 1 1 30%; padding: 10px 8px; font-size: 0.85em; }

    .toast {
        max-width: calc(100vw - 32px);
        padding: 12px 20px;
        font-size: 0.88em;
        bottom: 72px;
    }

    .site-footer { flex-wrap: wrap; gap: 8px; padding: 20px 12px; font-size: 0.82em; }
    .modal-content { padding: 22px 18px 16px; }

    .btn { padding: 10px 16px; font-size: 0.9em; }
}