/* ============================================
   双图打印助手 - Web版样式
   ============================================ */

/* ---------- Design Tokens ---------- */

:root {
    /* Colors */
    --color-bg: #0f0f14;
    --color-surface: #1a1a24;
    --color-surface-2: #22222e;
    --color-surface-3: #2a2a38;
    --color-border: rgba(255, 255, 255, 0.06);
    --color-border-hover: rgba(255, 255, 255, 0.12);
    --color-text: #e8e8ef;
    --color-text-secondary: #8b8b9e;
    --color-text-tertiary: #5a5a6e;
    /* Accent Colors */
    --color-blue: #6366f1;
    --color-blue-glow: rgba(99, 102, 241, 0.25);
    --color-blue-soft: rgba(99, 102, 241, 0.12);
    --color-green: #22c55e;
    --color-green-soft: rgba(34, 197, 94, 0.12);
    --color-orange: #f59e0b;
    --color-orange-soft: rgba(245, 158, 11, 0.12);
    --color-purple: #a855f7;
    --color-purple-soft: rgba(168, 85, 247, 0.12);
    --color-red: #ef4444;
    --color-red-soft: rgba(239, 68, 68, 0.12);
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-xs: 0.6875rem;
    --font-sm: 0.75rem;
    --font-base: 0.8125rem;
    --font-md: 0.875rem;
    --font-lg: 1rem;
    --font-xl: 1.125rem;
    /* Spacing */
    --sp-1: 4px;
    --sp-2: 8px;
    --sp-3: 12px;
    --sp-4: 16px;
    --sp-5: 20px;
    --sp-6: 24px;
    /* Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-full: 9999px;
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
    --shadow-glow-blue: 0 0 20px var(--color-blue-glow);
    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: 150ms var(--ease-out);
    --transition-normal: 250ms var(--ease-out);
    --transition-slow: 400ms var(--ease-out);
    /* Layout */
    --panel-width: 340px;
    --title-bar-height: 56px;
}

/* ---------- Reset & Base ---------- */

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

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: var(--font-family);
    font-size: var(--font-base);
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    outline: none;
    background: none;
    color: inherit;
    font-size: inherit;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    background: transparent;
    width: 100%;
    cursor: pointer;
}

/* ---------- App Container ---------- */

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
    background: var(--color-bg);
}

/* ---------- Title Bar ---------- */

.title-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--title-bar-height);
    padding: 0 var(--sp-5);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: relative;
    z-index: 10;
}

.title-left {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
}

.app-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(168, 85, 247, 0.15));
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.title-text h1 {
    font-size: var(--font-md);
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--color-text);
    line-height: 1.2;
}

.title-text p {
    font-size: var(--font-xs);
    color: var(--color-text-secondary);
    letter-spacing: 0.05em;
}

.title-right {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
}

.status-badge {
    display: flex;
    align-items: center;
    gap: var(--sp-1);
    padding: var(--sp-1) var(--sp-2);
    border-radius: var(--radius-full);
    background: var(--color-purple-soft);
    color: var(--color-purple);
    font-size: var(--font-sm);
    font-weight: 500;
    transition: all var(--transition-normal);
}

.status-badge.page-badge {
    background: var(--color-green-soft);
    color: var(--color-green);
}

/* ---------- Main Content ---------- */

.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ---------- Control Panel ---------- */

.control-panel {
    width: var(--panel-width);
    min-width: 300px;
    max-width: 420px;
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-scroll {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--sp-5);
    display: flex;
    flex-direction: column;
    gap: var(--sp-4);
}

/* Custom scrollbar */

.panel-scroll::-webkit-scrollbar {
    width: 5px;
}

.panel-scroll::-webkit-scrollbar-track {
    background: transparent;
}

.panel-scroll::-webkit-scrollbar-thumb {
    background: var(--color-surface-3);
    border-radius: var(--radius-full);
}

.panel-scroll::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-tertiary);
}

/* ---------- Settings Card ---------- */

.settings-card {
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--sp-4);
    display: flex;
    flex-direction: column;
    gap: var(--sp-4);
    transition: border-color var(--transition-normal);
}

.settings-card:hover {
    border-color: var(--color-border-hover);
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
}

.card-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.card-icon.blue {
    background: var(--color-blue-soft);
    color: var(--color-blue);
}

.card-icon.green {
    background: var(--color-green-soft);
    color: var(--color-green);
}

.card-icon.orange {
    background: var(--color-orange-soft);
    color: var(--color-orange);
}

.card-icon.purple {
    background: var(--color-purple-soft);
    color: var(--color-purple);
}

.card-title {
    font-size: var(--font-md);
    font-weight: 600;
    letter-spacing: -0.01em;
}

.toggle-btn {
    margin-left: auto;
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    background: var(--color-surface-3);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.toggle-btn:hover {
    background: var(--color-surface);
    color: var(--color-text);
}

.toggle-btn.open svg {
    transform: rotate(180deg);
}

.toggle-btn svg {
    transition: transform var(--transition-normal);
}

/* ---------- Segmented Control ---------- */

.segmented-control {
    display: flex;
    gap: 2px;
    background: var(--color-surface-3);
    border-radius: var(--radius-md);
    padding: 3px;
}

.seg-btn {
    flex: 1;
    padding: var(--sp-2) var(--sp-3);
    font-size: var(--font-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    text-align: center;
}

.seg-btn:hover {
    color: var(--color-text);
}

.seg-btn.active {
    background: var(--color-blue);
    color: #fff;
    box-shadow: var(--shadow-sm);
}

/* ---------- Slider Group ---------- */

.slider-group {
    display: flex;
    flex-direction: column;
    gap: var(--sp-2);
}

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

.slider-label span:first-child {
    font-size: var(--font-base);
    font-weight: 500;
}

.slider-value {
    font-size: var(--font-xs);
    font-weight: 600;
    padding: 2px var(--sp-2);
    border-radius: var(--radius-full);
}

.slider-value.blue {
    color: var(--color-blue);
    background: var(--color-blue-soft);
}

.slider-value.orange {
    color: var(--color-orange);
    background: var(--color-orange-soft);
}

.slider-wrapper {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

/* Range Slider Styling */

.slider {
    height: 6px;
    border-radius: var(--radius-full);
    outline: none;
    margin: var(--sp-2) 0;
}

.slider::-webkit-slider-runnable-track {
    height: 6px;
    border-radius: var(--radius-full);
    background: var(--color-surface-3);
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    margin-top: -6px;
    border: 2px solid #fff;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.blue-slider::-webkit-slider-thumb {
    background: var(--color-blue);
}

.orange-slider::-webkit-slider-thumb {
    background: var(--color-orange);
}

.slider-range {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-xs);
    color: var(--color-text-tertiary);
}

.slider-hint {
    font-size: var(--font-xs);
    color: var(--color-text-tertiary);
    margin-top: 2px;
}

/* ---------- Mode Selector ---------- */

.mode-selector {
    display: flex;
    flex-direction: column;
    gap: var(--sp-3);
}

.mode-btn {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    padding: var(--sp-3);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
    text-align: left;
    width: 100%;
}

.mode-btn:hover {
    border-color: var(--color-border-hover);
    background: var(--color-surface-3);
}

.mode-btn.active {
    border-color: rgba(99, 102, 241, 0.4);
    background: var(--color-blue-soft);
}

.mode-check {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--color-text-tertiary);
    transition: color var(--transition-fast);
}

.mode-btn.active .mode-check {
    color: var(--color-blue);
}

.mode-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.mode-name {
    font-size: var(--font-base);
    font-weight: 500;
}

.mode-desc {
    font-size: var(--font-xs);
    color: var(--color-text-secondary);
}

/* ---------- Stats Row ---------- */

.stat-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.stat-label {
    font-size: var(--font-base);
    color: var(--color-text-secondary);
}

.stat-count {
    font-size: var(--font-base);
    font-weight: 600;
    padding: 2px var(--sp-3);
    border-radius: var(--radius-full);
    background: var(--color-surface-3);
    color: var(--color-text-secondary);
    transition: all var(--transition-normal);
}

.stat-count.has-images {
    background: var(--color-green-soft);
    color: var(--color-green);
}

/* ---------- Image List ---------- */

.image-list-container {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.image-list-container.open {
    max-height: 220px;
    overflow-y: auto;
}

.image-list-container::-webkit-scrollbar {
    width: 4px;
}

.image-list-container::-webkit-scrollbar-thumb {
    background: var(--color-surface-3);
    border-radius: var(--radius-full);
}

.image-list {
    display: flex;
    flex-direction: column;
    gap: var(--sp-2);
    padding: 2px 0;
}

.image-item {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    padding: var(--sp-2) var(--sp-3);
    background: var(--color-surface-3);
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
    animation: slideIn 250ms var(--ease-out) both;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-8px) scale(0.97);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.image-item:hover {
    background: rgba(255, 255, 255, 0.06);
}

.image-thumb {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    border: 1px solid var(--color-border);
}

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

.image-info .name {
    font-size: var(--font-sm);
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.image-info .size {
    font-size: var(--font-xs);
    color: var(--color-text-tertiary);
}

.delete-btn {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    background: var(--color-red-soft);
    color: var(--color-red);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition-fast);
    opacity: 0;
}

.image-item:hover .delete-btn {
    opacity: 1;
}

.delete-btn:hover {
    background: var(--color-red);
    color: #fff;
    transform: scale(1.1);
}

/* ---------- Buttons ---------- */

.btn-primary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--sp-2);
    padding: var(--sp-3) var(--sp-4);
    border-radius: var(--radius-md);
    font-size: var(--font-md);
    font-weight: 600;
    transition: all var(--transition-fast);
    width: 100%;
}

.add-btn {
    background: var(--color-blue);
    color: #fff;
    box-shadow: var(--shadow-sm), var(--shadow-glow-blue);
}

.add-btn:hover {
    background: #5558e6;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md), 0 0 30px var(--color-blue-glow);
}

.add-btn:active {
    transform: translateY(0);
}

.print-btn {
    background: linear-gradient(135deg, var(--color-blue), var(--color-purple));
    color: #fff;
    padding: var(--sp-4);
    font-size: var(--font-md);
    box-shadow: var(--shadow-sm);
}

.print-btn:not(:disabled):hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md), 0 0 25px var(--color-blue-glow);
}

.print-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.secondary-actions {
    display: flex;
    gap: var(--sp-3);
}

.btn-secondary {
    flex: 1;
    padding: var(--sp-2) var(--sp-3);
    font-size: var(--font-sm);
    font-weight: 500;
    border-radius: var(--radius-sm);
    background: var(--color-surface-3);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
}

.btn-secondary:not(:disabled):hover {
    background: var(--color-surface);
    color: var(--color-text);
    border-color: var(--color-border-hover);
}

.btn-secondary:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

/* ---------- Divider ---------- */

.divider {
    width: 4px;
    cursor: col-resize;
    background: transparent;
    position: relative;
    flex-shrink: 0;
    z-index: 5;
    transition: background var(--transition-fast);
}

.divider::before {
    content: '';
    position: absolute;
    left: -3px;
    right: -3px;
    top: 0;
    bottom: 0;
}

.divider:hover,
.divider.dragging {
    background: var(--color-blue);
}

/* ---------- Preview Area ---------- */

.preview-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--color-bg);
    min-width: 400px;
    overflow: hidden;
}

.preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--sp-4) var(--sp-5);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}

.preview-title h2 {
    font-size: var(--font-md);
    font-weight: 600;
    letter-spacing: -0.01em;
}

.preview-title p {
    font-size: var(--font-xs);
    color: var(--color-text-secondary);
    margin-top: 2px;
}

.preview-badges {
    display: flex;
    gap: var(--sp-2);
}

.preview-badge {
    display: flex;
    align-items: center;
    gap: var(--sp-1);
    padding: var(--sp-1) var(--sp-2);
    border-radius: var(--radius-full);
    font-size: var(--font-sm);
    font-weight: 500;
}

.preview-badge.blue {
    background: var(--color-blue-soft);
    color: var(--color-blue);
}

.preview-badge.green {
    background: var(--color-green-soft);
    color: var(--color-green);
}

/* ---------- Preview Content ---------- */

.preview-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--sp-5);
    overflow: auto;
    position: relative;
}

.preview-placeholder {
    text-align: center;
    animation: fadeIn 600ms var(--ease-out);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.placeholder-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto var(--sp-5);
    border-radius: var(--radius-lg);
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-tertiary);
}

.preview-placeholder h3 {
    font-size: var(--font-xl);
    font-weight: 600;
    margin-bottom: var(--sp-2);
}

.preview-placeholder p {
    font-size: var(--font-base);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ---------- Preview Canvas ---------- */

.preview-canvas-wrapper {
    width: 100%;
    height: 100%;
    overflow: auto;
    display: flex;
    justify-content: center;
    padding: var(--sp-4);
}

.preview-canvas-wrapper::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

.preview-canvas-wrapper::-webkit-scrollbar-thumb {
    background: var(--color-surface-3);
    border-radius: var(--radius-full);
}

.pages-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--sp-5);
    padding-bottom: var(--sp-5);
}

.page-canvas {
    background: #fff;
    border-radius: 4px;
    box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0, 0, 0, 0.08);
    max-width: 100%;
    transition: box-shadow var(--transition-normal);
}

.page-canvas:hover {
    box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0, 0, 0, 0.12), 0 0 40px rgba(99, 102, 241, 0.08);
}

.page-label {
    font-size: var(--font-xs);
    color: var(--color-text-tertiary);
    font-weight: 500;
    text-align: center;
    margin-top: var(--sp-1);
}

/* ---------- Processing Overlay ---------- */

.processing-overlay {
    position: fixed;
    inset: 0;
    z-index: 100;
    background: rgba(15, 15, 20, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: overlayIn 200ms var(--ease-out);
}

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

.processing-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--sp-5);
    padding: var(--sp-6) 48px;
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    animation: cardIn 300ms var(--ease-out);
}

@keyframes cardIn {
    from {
        opacity: 0;
        transform: scale(0.92);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-surface-3);
    border-top-color: var(--color-blue);
    border-radius: 50%;
    animation: spin 800ms linear infinite;
}

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

.processing-card p {
    font-size: var(--font-md);
    font-weight: 500;
    color: var(--color-text);
}

/* ---------- Drop Overlay ---------- */

.drop-overlay {
    position: fixed;
    inset: 0;
    z-index: 90;
    background: rgba(15, 15, 20, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: none;
    align-items: center;
    justify-content: center;
    pointer-events: none;
}

.drop-overlay.visible {
    display: flex;
    animation: overlayIn 200ms var(--ease-out);
}

.drop-card {
    text-align: center;
    padding: 48px 64px;
    border: 2px dashed var(--color-blue);
    border-radius: var(--radius-lg);
    background: var(--color-blue-soft);
    animation: cardIn 300ms var(--ease-out);
}

.drop-card svg {
    color: var(--color-blue);
    margin-bottom: var(--sp-4);
}

.drop-card h3 {
    font-size: var(--font-xl);
    font-weight: 600;
    margin-bottom: var(--sp-2);
}

.drop-card p {
    font-size: var(--font-base);
    color: var(--color-text-secondary);
}

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

@media (max-width: 800px) {
    .main-content {
        flex-direction: column;
    }
    .control-panel {
        width: 100% !important;
        max-width: 100% !important;
        min-width: unset !important;
        max-height: 50vh;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
    }
    .divider {
        display: none;
    }
    .preview-area {
        min-width: unset;
    }
}