/* ==========================================
   DESIGN SYSTEM - CSS CUSTOM PROPERTIES
   ========================================== */

:root {
    /* Dark Mode Colors (Default) */
    --color-bg-primary: #0a0e1a;
    --color-bg-secondary: #111827;
    --color-bg-tertiary: #1a2332;

    --color-accent-primary: #3b82f6;
    --color-accent-secondary: #2563eb;
    --color-accent-tertiary: #1d4ed8;

    --color-text-primary: #f9fafb;
    --color-text-secondary: #d1d5db;
    --color-text-muted: #9ca3af;

    --color-border: rgba(255, 255, 255, 0.1);
    --color-border-hover: rgba(255, 255, 255, 0.2);

    /* Glassmorphism */
    --glass-bg: rgba(17, 24, 39, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'Fira Code', 'Courier New', monospace;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

/* Light Mode Colors */
[data-theme="light"] {
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f9fafb;
    --color-bg-tertiary: #f3f4f6;

    --color-accent-primary: #3b82f6;
    --color-accent-secondary: #2563eb;
    --color-accent-tertiary: #1d4ed8;

    --color-text-primary: #111827;
    --color-text-secondary: #4b5563;
    --color-text-muted: #6b7280;

    --color-border: rgba(0, 0, 0, 0.1);
    --color-border-hover: rgba(0, 0, 0, 0.2);

    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.1);

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

/* ==========================================
   RESET & BASE STYLES
   ========================================== */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* ==========================================
   BACKGROUND EFFECTS
   ========================================== */

/* Background effects removed for clean theme switching */

/* ==========================================
   HEADER
   ========================================== */

.header {
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    animation: slideDown 0.5s ease;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.header-content {
    max-width: 1800px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: var(--color-accent-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
}

.logo-icon svg {
    width: 28px;
    height: 28px;
}

.logo-icon:hover {
    transform: scale(1.05);
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(168, 85, 247, 0.7);
    }

    50% {
        transform: scale(1.05);
        box-shadow: 0 0 0 10px rgba(168, 85, 247, 0);
    }
}

.logo-text h1 {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-accent-primary);
    line-height: 1.2;
}

.subtitle {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-weight: 400;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* ==========================================
   BUTTONS
   ========================================== */

.btn-primary {
    background: var(--color-accent-primary);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    font-family: var(--font-primary);
}

.btn-primary:hover {
    background: var(--color-accent-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

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

.btn-primary svg {
    width: 18px;
    height: 18px;
}

.btn-secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-primary);
}

.btn-secondary:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-border-hover);
}

.btn-icon {
    background: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background: var(--color-bg-tertiary);
    border-color: var(--color-border-hover);
    color: var(--color-text-primary);
    transform: scale(1.05);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

/* ==========================================
   MAIN CONTAINER
   ========================================== */

.main-container {
    display: flex;
    height: calc(100vh - 88px);
    max-width: 1800px;
    margin: 0 auto;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
}

/* ==========================================
   SIDEBAR
   ========================================== */

.sidebar {
    width: 320px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    overflow-y: auto;
    box-shadow: var(--glass-shadow);
    animation: slideInLeft 0.5s ease;
    transition: transform var(--transition-normal);
}

@keyframes slideInLeft {
    from {
        transform: translateX(-100%);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.sidebar.hidden {
    transform: translateX(-100%);
    position: absolute;
    left: 0;
    height: calc(100vh - 120px);
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.sidebar-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
}

.page-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.info-item {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
}

.info-label {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.info-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent-primary);
}

.page-navigation {
    margin-bottom: var(--spacing-lg);
}

.page-navigation label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
}

.page-input-group {
    display: flex;
    gap: var(--spacing-sm);
}

.page-input-group input {
    flex: 1;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.5rem;
    color: var(--color-text-primary);
    font-size: 0.875rem;
    font-family: var(--font-primary);
}

.page-input-group input:focus {
    outline: none;
    border-color: var(--color-accent-primary);
}

.thumbnails {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.thumbnail-item {
    cursor: pointer;
    padding: var(--spacing-sm);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-tertiary);
    transition: all var(--transition-fast);
    text-align: center;
}

.thumbnail-item:hover {
    border-color: var(--color-accent-primary);
    transform: scale(1.02);
    box-shadow: var(--shadow-md);
}

.thumbnail-item.active {
    border-color: var(--color-accent-primary);
    background: var(--color-accent-primary);
    background: linear-gradient(to bottom, var(--color-accent-primary) 0%, var(--color-accent-primary) 4px, var(--color-bg-tertiary) 4px);
}

.thumbnail-canvas-wrapper {
    margin-bottom: var(--spacing-xs);
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: white;
}

.thumbnail-canvas-wrapper canvas {
    width: 100%;
    height: auto;
    display: block;
}

.thumbnail-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

.thumbnail-item.active .thumbnail-label {
    color: var(--color-accent-primary);
    font-weight: 600;
}

.show-more-btn {
    text-align: center;
    padding: var(--spacing-md) 0;
}

.show-more-btn button {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin: 0 auto;
    font-family: var(--font-primary);
}

.show-more-btn button:hover {
    background: var(--color-accent-primary);
    color: white;
    border-color: var(--color-accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.show-more-btn button svg {
    width: 16px;
    height: 16px;
}

.loading-text {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    text-align: center;
    padding: var(--spacing-lg);
}

/* ==========================================
   VIEWER CONTAINER
   ========================================== */

.viewer-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--glass-shadow);
    position: relative;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.sidebar-toggle {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    z-index: 10;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    color: var(--color-text-primary);
    border: 1px solid var(--glass-border);
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
}

.sidebar-toggle:hover {
    background: var(--color-bg-tertiary);
    transform: scale(1.05);
}

.sidebar-toggle svg {
    width: 22px;
    height: 22px;
}

/* ==========================================
   SEARCH PANEL
   ========================================== */

.search-panel {
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md);
    display: none;
    animation: slideDown 0.3s ease;
}

.search-panel.active {
    display: block;
}

.search-input-group {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.search-input-group input {
    flex: 1;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.5rem 1rem;
    color: var(--color-text-primary);
    font-size: 0.875rem;
    font-family: var(--font-primary);
}

.search-input-group input:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.1);
}

.search-results {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-align: center;
}

/* ==========================================
   CONTROLS
   ========================================== */

.controls {
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-xl);
}

.control-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.page-indicator,
.zoom-level {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    min-width: 80px;
    text-align: center;
    font-family: var(--font-mono);
}

/* ==========================================
   CANVAS CONTAINER
   ========================================== */

.canvas-container {
    flex: 1;
    overflow: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    position: relative;
    background: var(--color-bg-primary);
}

.canvas-container::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

.canvas-container::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
}

.canvas-container::-webkit-scrollbar-thumb {
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
    border: 2px solid var(--color-bg-secondary);
}

.canvas-container::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent-primary);
}

#pdfCanvas {
    box-shadow: var(--shadow-xl);
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
}

/* ==========================================
   LOADING OVERLAY
   ========================================== */

.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    z-index: 50;
}

.loading-overlay.hidden {
    display: none;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-overlay p {
    color: var(--color-text-secondary);
    font-size: 1rem;
    font-weight: 500;
}

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */

@media (max-width: 1024px) {
    .header-content {
        padding: var(--spacing-md);
    }

    .logo-text h1 {
        font-size: 1.25rem;
    }

    .main-container {
        padding: var(--spacing-md);
        gap: var(--spacing-md);
    }

    .sidebar {
        width: 280px;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .header-actions {
        width: 100%;
        justify-content: space-between;
    }

    .btn-primary span {
        display: none;
    }

    .main-container {
        flex-direction: column;
        height: auto;
    }

    .sidebar {
        width: 100%;
        max-height: 300px;
    }

    .sidebar.hidden {
        display: none;
    }

    .controls {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .canvas-container {
        min-height: 500px;
    }
}

@media (max-width: 480px) {
    .logo-text h1 {
        font-size: 1rem;
    }

    .subtitle {
        font-size: 0.75rem;
    }

    .btn-icon {
        width: 36px;
        height: 36px;
    }

    .control-group {
        gap: var(--spacing-sm);
    }
}