:root {
    /* Color Palette */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    
    --secondary-50: #f8fafc;
    --secondary-100: #f1f5f9;
    --secondary-200: #e2e8f0;
    --secondary-300: #cbd5e1;
    --secondary-400: #94a3b8;
    --secondary-500: #64748b;
    --secondary-600: #475569;
    --secondary-700: #334155;
    --secondary-800: #1e293b;
    --secondary-900: #0f172a;
    
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #06b6d4;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-medium: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    
    /* Borders */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    min-height: 100vh;
    color: var(--secondary-800);
    line-height: 1.5;
    padding-top: 70px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Ad Banner */
.ad-banner {
    margin-bottom: 24px;
}

/* Main Layout */
.main-content {
    background: white;
    border-radius: var(--radius-2xl);
    padding: 32px;
    box-shadow: var(--shadow-lg);
}

.tool-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
}

@media (min-width: 1024px) {
    .tool-layout {
        grid-template-columns: 1fr 3fr;
        gap: 32px;
    }
}

/* Control Cards */
.control-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--secondary-200);
}

.tool-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary-900);
    margin-bottom: 8px;
}

.tool-description {
    font-size: 0.875rem;
    color: var(--secondary-600);
    margin-bottom: 24px;
}

/* Upload Section */
.upload-section {
    margin-bottom: 24px;
}

.section-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--secondary-800);
    margin-bottom: 8px;
}

.upload-area {
    width: 100%;
    height: 128px;
    border: 2px dashed var(--primary-200);
    border-radius: var(--radius-xl);
    background: var(--primary-50);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
    transition: all var(--transition-normal);
}

.upload-area:hover {
    background: var(--primary-100);
    border-color: var(--primary-300);
}

.upload-area.dragover {
    background: var(--primary-100);
    border-color: var(--primary-500);
}

.upload-content {
    text-align: center;
    pointer-events: none;
}

.upload-icon {
    font-size: 2.5rem;
    color: var(--primary-500);
    margin-bottom: 12px;
}

.upload-text {
    font-size: 0.875rem;
    color: var(--secondary-600);
    margin-bottom: 4px;
}

.upload-subtext {
    font-size: 0.75rem;
    color: var(--secondary-500);
}

.file-input {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.file-name {
    font-size: 0.75rem;
    color: var(--secondary-500);
    margin-top: 8px;
    text-align: center;
    min-height: 20px;
}

/* Search Section */
.search-section {
    margin-bottom: 24px;
}

.search-box {
    display: flex;
    gap: 8px;
}

.search-input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--secondary-300);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px var(--primary-100);
}

.search-button {
    padding: 12px 20px;
    background: var(--primary-600);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-button:hover {
    background: var(--primary-700);
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}

/* Zoom Controls */
.zoom-section {
    margin-bottom: 24px;
}

.zoom-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.zoom-buttons {
    display: flex;
    gap: 4px;
}

.zoom-button {
    padding: 6px 12px;
    background: var(--secondary-100);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--secondary-700);
    transition: all var(--transition-fast);
}

.zoom-button:hover {
    background: var(--secondary-200);
}

.zoom-slider {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    background: var(--secondary-200);
    border-radius: 3px;
    outline: none;
}

.zoom-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-500);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.zoom-slider::-webkit-slider-thumb:hover {
    background: var(--primary-600);
    transform: scale(1.1);
}

/* Results Panel */
.results-panel {
    background: var(--primary-50);
    border: 1px solid var(--primary-200);
    border-radius: var(--radius-lg);
    padding: 16px;
    margin-bottom: 24px;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.results-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--secondary-800);
}

.match-count {
    background: var(--secondary-100);
    padding: 4px 12px;
    border-radius: 999px;
    color: var(--secondary-900);
    font-weight: 600;
    font-size: 0.875rem;
}

.navigation-buttons {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.nav-button {
    flex: 1;
    padding: 10px 16px;
    background: white;
    border: 1px solid var(--secondary-200);
    border-radius: var(--radius-lg);
    color: var(--secondary-700);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: all var(--transition-normal);
}

.nav-button:hover {
    background: var(--secondary-50);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.clear-button {
    width: 100%;
    padding: 10px 16px;
    background: white;
    border: 1px solid var(--secondary-200);
    border-radius: var(--radius-lg);
    color: var(--secondary-700);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: all var(--transition-normal);
}

.clear-button:hover {
    background: var(--secondary-50);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

/* Pages List */
.section-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--secondary-800);
    margin-bottom: 16px;
}

.pages-list {
    max-height: 320px;
    overflow-y: auto;
}

.pages-list::-webkit-scrollbar {
    width: 6px;
}

.pages-list::-webkit-scrollbar-track {
    background: var(--secondary-100);
    border-radius: 3px;
}

.pages-list::-webkit-scrollbar-thumb {
    background: var(--secondary-300);
    border-radius: 3px;
}

.pages-list::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-400);
}

.empty-state {
    padding: 12px;
    text-align: center;
    color: var(--secondary-500);
}

.page-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    border-bottom: 1px solid var(--secondary-200);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.page-item:hover {
    background: var(--secondary-50);
}

.page-number {
    font-weight: 500;
    color: var(--secondary-800);
}

/* Match Preview */
.match-preview {
    font-size: 0.875rem;
    color: var(--secondary-600);
    padding: 12px;
    background: var(--secondary-50);
    border-radius: var(--radius-lg);
    min-height: 80px;
}

.highlight {
    color: var(--primary-600);
    font-weight: 600;
}

/* Sidebar Ad */
.sidebar-ad {
    display: none;
}

@media (min-width: 1024px) {
    .sidebar-ad {
        display: block;
    }
}

/* Viewer Column */
.viewer-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--secondary-200);
    position: relative;
}

.viewer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.viewer-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--secondary-800);
}

.fullscreen-button {
    padding: 8px 16px;
    background: var(--secondary-100);
    color: var(--secondary-700);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.fullscreen-button:hover {
    background: var(--secondary-200);
}

.viewer-container {
    height: 70vh;
    overflow: auto;
    border-radius: var(--radius-lg);
    background: var(--secondary-50);
    position: relative;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

@media (min-width: 1024px) {
    .viewer-container {
        height: 75vh;
    }
}

.viewer-container::-webkit-scrollbar {
    width: 8px;
}

.viewer-container::-webkit-scrollbar-track {
    background: var(--secondary-100);
    border-radius: 4px;
}

.viewer-container::-webkit-scrollbar-thumb {
    background: var(--secondary-300);
    border-radius: 4px;
}

.viewer-container::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-400);
}

.viewer-inner {
    padding: 16px;
}

.initial-state {
    text-align: center;
    padding: 48px 0;
    color: var(--secondary-500);
}

.pdf-icon {
    font-size: 3rem;
    color: var(--secondary-400);
    margin-bottom: 12px;
}

/* PDF Canvas and Text Layer */
.pdf-page {
    position: relative;
    margin: 20px auto;
    box-shadow: 0 8px 28px rgba(2, 6, 23, 0.06);
    border-radius: 8px;
    overflow: visible;
    background: white;
}

.pdf-canvas {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 6px;
}

.text-layer {
    position: absolute;
    left: 0;
    top: 0;
    pointer-events: none;
    color: transparent;
    -webkit-text-fill-color: transparent;
    overflow: hidden;
}

.text-span {
    position: absolute;
    white-space: pre;
    pointer-events: auto;
    cursor: text;
    color: transparent !important;
    -webkit-text-fill-color: transparent !important;
    transform: scaleY(-1);
}

.match {
    background: rgba(59, 130, 246, 0.35);
    border-radius: 2px;
    padding: 0;
    margin: 0;
    box-decoration-break: clone;
    color: transparent !important;
    -webkit-text-fill-color: transparent !important;
}

.match.focus {
    background: rgba(59, 130, 246, 0.65);
    box-shadow: 0 0 0 6px rgba(59, 130, 246, 0.08);
    color: transparent !important;
    -webkit-text-fill-color: transparent !important;
}

/* Loading States */
.loading-spinner {
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary-500);
    border-radius: 50%;
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-text {
    text-align: center;
    color: var(--secondary-500);
    margin-top: 8px;
}

.error-message {
    text-align: center;
    color: var(--danger);
    padding: 32px 0;
}

/* Content Ad */
.content-ad {
    margin-bottom: 24px;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

/* SEO Content */
.seo-content {
    background: white;
    border-radius: var(--radius-xl);
    padding: 24px;
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--secondary-200);
}

.seo-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary-800);
    margin-bottom: 12px;
}

.seo-description {
    font-size: 1rem;
    color: var(--secondary-700);
    margin-bottom: 24px;
    line-height: 1.6;
}

.seo-subtitle {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--secondary-800);
    margin: 24px 0 12px 0;
}

.seo-list {
    padding-left: 24px;
    margin-bottom: 16px;
}

.seo-list li {
    margin-bottom: 8px;
    color: var(--secondary-700);
    line-height: 1.5;
}

.numbered-list {
    list-style-type: decimal;
}

.bulleted-list {
    list-style-type: disc;
}

/* Shortcuts */
.shortcuts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
    margin-top: 16px;
}

.shortcut-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.shortcut-key {
    background: var(--secondary-100);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-family: monospace;
    font-size: 0.875rem;
    color: var(--secondary-800);
    border: 1px solid var(--secondary-200);
}

.shortcut-desc {
    font-size: 0.875rem;
    color: var(--secondary-700);
}

/* No Match Popup */
.no-match-popup {
    position: fixed;
    inset: 0;
    z-index: 9999;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
}

.no-match-popup.show {
    opacity: 1;
    pointer-events: auto;
}

.popup-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.popup-content {
    background: white;
    max-width: 400px;
    width: 100%;
    padding: 32px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    text-align: center;
    position: relative;
    transform: scale(0.95);
    transition: transform var(--transition-normal);
}

.no-match-popup.show .popup-content {
    transform: scale(1);
}

.popup-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: none;
    border: none;
    color: var(--secondary-400);
    cursor: pointer;
    font-size: 1.25rem;
    transition: color var(--transition-fast);
}

.popup-close:hover {
    color: var(--secondary-600);
}

.popup-icon {
    width: 48px;
    height: 48px;
    background: #fee2e2;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.popup-icon i {
    color: #dc2626;
    font-size: 1.5rem;
}

.popup-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--secondary-800);
    margin-bottom: 8px;
}

.popup-message {
    font-size: 0.875rem;
    color: var(--secondary-600);
    margin-bottom: 24px;
    line-height: 1.5;
}

.query-text {
    font-weight: 500;
    color: var(--secondary-700);
}

.popup-buttons {
    display: flex;
    justify-content: center;
    gap: 12px;
}

.popup-button {
    padding: 8px 16px;
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-normal);
}

.popup-button.blue {
    background: var(--primary-500);
    color: white;
}

.popup-button.blue:hover {
    background: var(--primary-600);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.popup-button.green {
    background: var(--success);
    color: white;
}

.popup-button.green:hover {
    background: #0da271;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

/* Fullscreen Mode */
:fullscreen .viewer-card,
:-webkit-full-screen .viewer-card,
:-moz-full-screen .viewer-card,
:-ms-fullscreen .viewer-card {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 9999;
    background: white;
    padding: 20px;
    border-radius: 0;
}

:fullscreen .viewer-container,
:-webkit-full-screen .viewer-container,
:-moz-full-screen .viewer-container,
:-ms-fullscreen .viewer-container {
    height: calc(100vh - 80px) !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 12px;
    }
    
    .main-content {
        padding: 20px;
    }
    
    .control-card {
        padding: 20px;
    }
    
    .tool-layout {
        gap: 24px;
    }
    
    .shortcuts-grid {
        grid-template-columns: 1fr;
    }
    
    .popup-buttons {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .search-box {
        flex-direction: column;
    }
    
    .search-button {
        width: 100%;
    }
    
    .navigation-buttons {
        flex-direction: column;
    }
    
    .zoom-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
}