/* ========================================
   识书 - 儿童绘本管理应用样式
   ======================================== */

/* CSS Variables */
:root {
    /* Primary Colors - Warm Teal Gradient */
    --primary-50: #E8FAF8;
    --primary-100: #B8F0EA;
    --primary-200: #88E5DB;
    --primary-300: #58DBCD;
    --primary-400: #4ECDC4;
    --primary-500: #3DBEB5;
    --primary-600: #2DA99F;
    --primary-700: #1D8A82;
    --primary-800: #126B65;
    --primary-900: #074C48;

    /* Secondary Colors - Warm Coral */
    --secondary-50: #FFF0ED;
    --secondary-100: #FFD9D1;
    --secondary-200: #FFB3A5;
    --secondary-300: #FF8D79;
    --secondary-400: #FF6B6B;
    --secondary-500: #EE5A5A;
    --secondary-600: #D14949;
    --secondary-700: #B43838;
    --secondary-800: #972727;
    --secondary-900: #7A1616;

    /* Accent Colors */
    --accent-yellow: #FFE66D;
    --accent-purple: #A78BFA;
    --accent-blue: #60A5FA;
    --accent-green: #34D399;
    --accent-orange: #FB923C;

    /* Neutral Colors */
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;

    /* Semantic Colors */
    --success: #10B981;
    --warning: #F59E0B;
    --error: #EF4444;
    --info: #3B82F6;

    /* Background & Surface */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8FFFE;
    --bg-tertiary: #F0FDFB;
    --surface: #FFFFFF;
    --surface-elevated: #FFFFFF;

    /* Text Colors */
    --text-primary: #1F2937;
    --text-secondary: #4B5563;
    --text-tertiary: #9CA3AF;
    --text-inverse: #FFFFFF;

    /* Border */
    --border-light: #E5E7EB;
    --border-medium: #D1D5DB;

    /* 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), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #4ECDC4 0%, #44A8A0 100%);
    --gradient-secondary: linear-gradient(135deg, #FF6B6B 0%, #EE5A5A 100%);
    --gradient-warm: linear-gradient(135deg, #FFE66D 0%, #FB923C 100%);
    --gradient-cool: linear-gradient(135deg, #60A5FA 0%, #A78BFA 100%);
    --gradient-bg: linear-gradient(180deg, #F8FFFE 0%, #E8FAF8 100%);

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Typography */
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    --transition-bounce: 300ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* Z-Index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-toast: 600;

    /* Layout */
    --header-height: 60px;
    --bottom-nav-height: 70px;
    --max-content-width: 1200px;
}

/* Dark Mode */
[data-theme="dark"] {
    --bg-primary: #0F172A;
    --bg-secondary: #1E293B;
    --bg-tertiary: #334155;
    --surface: #1E293B;
    --surface-elevated: #334155;

    --text-primary: #F1F5F9;
    --text-secondary: #CBD5E1;
    --text-tertiary: #64748B;

    --border-light: #334155;
    --border-medium: #475569;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);

    --gradient-bg: linear-gradient(180deg, #0F172A 0%, #1E293B 100%);
}

/* ========================================
   Base Styles
   ======================================== */

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

html {
    font-size: 16px;
    -webkit-tap-highlight-color: transparent;
}

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

a {
    color: var(--primary-500);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-600);
}

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

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.hidden {
    display: none !important;
}

/* ========================================
   Loading Screen
   ======================================== */

.loading-screen {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    z-index: 9999;
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.loading-screen.fade-out {
    opacity: 0;
    visibility: hidden;
}

.loading-content {
    text-align: center;
    color: white;
}

.loading-icon {
    font-size: 4rem;
    margin-bottom: var(--space-4);
    animation: bounce 1s ease infinite;
}

.loading-content h1 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--space-2);
}

.loading-content p {
    font-size: var(--font-size-sm);
    opacity: 0.8;
    margin-bottom: var(--space-6);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    margin: 0 auto;
    animation: spin 0.8s linear infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

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

/* ========================================
   App Container
   ======================================== */

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ========================================
   Header
   ======================================== */

.header {
    position: sticky;
    top: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border-light);
    z-index: var(--z-sticky);
    backdrop-filter: blur(10px);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    max-width: var(--max-content-width);
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-500);
}

.logo i {
    font-size: var(--font-size-2xl);
}

.header-actions {
    display: flex;
    gap: var(--space-2);
}

.icon-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.icon-btn:hover {
    background: var(--gray-100);
    color: var(--text-primary);
}

[data-theme="dark"] .icon-btn:hover {
    background: var(--gray-700);
}

/* Search Bar */
.search-bar {
    padding: 0 var(--space-4) var(--space-3);
    animation: slideDown var(--transition-base);
}

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

.search-input-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.search-input-wrapper:focus-within {
    border-color: var(--primary-400);
    box-shadow: 0 0 0 3px var(--primary-100);
}

[data-theme="dark"] .search-input-wrapper:focus-within {
    box-shadow: 0 0 0 3px rgba(78, 205, 196, 0.2);
}

.search-input-wrapper i {
    color: var(--text-tertiary);
}

.search-input-wrapper input {
    flex: 1;
    border: none;
    background: none;
    outline: none;
    color: var(--text-primary);
}

.search-input-wrapper input::placeholder {
    color: var(--text-tertiary);
}

.btn-clear {
    padding: var(--space-1);
    color: var(--text-tertiary);
    transition: color var(--transition-fast);
}

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

/* ========================================
   Main Content
   ======================================== */

.main-content {
    flex: 1;
    padding: var(--space-4);
    padding-bottom: calc(var(--bottom-nav-height) + var(--space-8));
    max-width: var(--max-content-width);
    margin: 0 auto;
    width: 100%;
}

/* ========================================
   Bottom Navigation
   ======================================== */

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--bottom-nav-height);
    display: flex;
    align-items: center;
    justify-content: space-around;
    background: var(--surface);
    border-top: 1px solid var(--border-light);
    padding-bottom: env(safe-area-inset-bottom);
    z-index: var(--z-fixed);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-2) var(--space-4);
    color: var(--text-tertiary);
    font-size: var(--font-size-xs);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-item i {
    font-size: var(--font-size-xl);
}

.nav-item.active {
    color: var(--primary-500);
}

.nav-item.active::after {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

/* Scan Button (Center) */
.nav-item.scan-btn {
    padding: 0;
}

.scan-btn-inner {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    color: white;
    font-size: var(--font-size-xl);
    box-shadow: 0 4px 15px rgba(78, 205, 196, 0.4);
    transform: translateY(-10px);
    transition: all var(--transition-fast);
}

.scan-btn:hover .scan-btn-inner {
    transform: translateY(-12px) scale(1.05);
    box-shadow: 0 6px 20px rgba(78, 205, 196, 0.5);
}

.scan-btn span {
    margin-top: -6px;
}

/* ========================================
   Floating Action Button
   ======================================== */

.fab {
    position: fixed;
    right: var(--space-4);
    bottom: calc(var(--bottom-nav-height) + var(--space-4));
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-secondary);
    color: white;
    border-radius: var(--radius-full);
    font-size: var(--font-size-xl);
    box-shadow: var(--shadow-lg);
    z-index: var(--z-fixed);
    transition: all var(--transition-fast);
}

.fab:hover {
    transform: scale(1.1) rotate(90deg);
    box-shadow: var(--shadow-xl);
}

/* Hide FAB on home view */
.view-home ~ .fab {
    display: none;
}

/* ========================================
   Buttons
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 2px 8px rgba(78, 205, 196, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(78, 205, 196, 0.4);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
}

.btn-secondary:hover {
    background: var(--gray-100);
    border-color: var(--border-medium);
}

[data-theme="dark"] .btn-secondary:hover {
    background: var(--gray-700);
}

.btn-danger {
    background: var(--error);
    color: white;
}

.btn-danger:hover {
    background: #DC2626;
}

.btn-ghost {
    color: var(--text-secondary);
}

.btn-ghost:hover {
    background: var(--gray-100);
    color: var(--text-primary);
}

.btn-lg {
    padding: var(--space-4) var(--space-6);
    font-size: var(--font-size-base);
}

.btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-xs);
}

.btn-block {
    width: 100%;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* ========================================
   Cards
   ======================================== */

.card {
    background: var(--surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: all var(--transition-fast);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    padding: var(--space-4);
    border-bottom: 1px solid var(--border-light);
}

.card-body {
    padding: var(--space-4);
}

.card-footer {
    padding: var(--space-4);
    border-top: 1px solid var(--border-light);
    background: var(--bg-secondary);
}

/* ========================================
   Book Card
   ======================================== */

.book-card {
    display: flex;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.book-cover {
    width: 80px;
    height: 110px;
    flex-shrink: 0;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--gradient-cool);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-size-2xl);
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.book-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.book-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.book-author {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.book-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: auto;
}

.book-tag {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-xs);
    background: var(--primary-50);
    color: var(--primary-600);
    border-radius: var(--radius-full);
}

[data-theme="dark"] .book-tag {
    background: rgba(78, 205, 196, 0.15);
    color: var(--primary-300);
}

.book-status {
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-xs);
    border-radius: var(--radius-full);
    font-weight: 500;
}

.book-status.unread {
    background: var(--gray-100);
    color: var(--gray-600);
}

.book-status.reading {
    background: var(--accent-yellow);
    color: var(--gray-800);
}

.book-status.read {
    background: var(--success);
    color: white;
}

/* Book Grid */
.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-4);
}

/* ========================================
   Modals
   ======================================== */

.modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    z-index: var(--z-modal);
    backdrop-filter: blur(4px);
    animation: fadeIn var(--transition-fast);
}

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

.modal-content {
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    background: var(--surface);
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
    overflow: hidden;
    animation: slideUp var(--transition-base);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(100%);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (min-width: 640px) {
    .modal {
        align-items: center;
    }
    
    .modal-content {
        border-radius: var(--radius-2xl);
        max-height: 85vh;
    }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4);
    border-bottom: 1px solid var(--border-light);
}

.modal-header h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.modal-close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--gray-100);
    color: var(--text-primary);
}

.modal-actions {
    display: flex;
    gap: var(--space-3);
    padding: var(--space-4);
}

.modal-actions .btn {
    flex: 1;
}

/* Duplicate Modal */
.duplicate-modal-content {
    text-align: center;
    padding: var(--space-6);
}

.modal-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-4);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    font-size: var(--font-size-2xl);
}

.modal-icon.warning {
    background: #FEF3C7;
    color: var(--warning);
}

.modal-icon.success {
    background: #D1FAE5;
    color: var(--success);
}

.duplicate-book-preview {
    margin: var(--space-4) 0;
    padding: var(--space-4);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
}

/* ========================================
   Scanner Modal
   ======================================== */

.scanner-modal-content {
    display: flex;
    flex-direction: column;
}

.scanner-tabs {
    display: flex;
    padding: var(--space-2);
    gap: var(--space-2);
    background: var(--bg-secondary);
}

.scanner-tab {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-3);
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    font-size: var(--font-size-xs);
    transition: all var(--transition-fast);
}

.scanner-tab i {
    font-size: var(--font-size-lg);
}

.scanner-tab.active {
    background: var(--surface);
    color: var(--primary-500);
    box-shadow: var(--shadow-sm);
}

.scanner-view {
    display: none;
    padding: var(--space-4);
    animation: fadeIn var(--transition-fast);
}

.scanner-view.active {
    display: block;
}

.scanner-container {
    position: relative;
    width: 100%;
    aspect-ratio: 4/3;
    background: #000;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

#scanner-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.scanner-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
}

.scanner-frame {
    width: 80%;
    height: 60%;
    border: 2px solid var(--primary-400);
    border-radius: var(--radius-lg);
    box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.5);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { border-color: var(--primary-400); }
    50% { border-color: var(--primary-200); }
}

.scanner-hint {
    text-align: center;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-top: var(--space-4);
}

/* Cover Scanner */
.cover-capture-area {
    margin-bottom: var(--space-4);
}

.cover-preview {
    width: 100%;
    aspect-ratio: 3/4;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    background: var(--bg-secondary);
    border: 2px dashed var(--border-medium);
    border-radius: var(--radius-xl);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
    overflow: hidden;
}

.cover-preview:hover {
    border-color: var(--primary-400);
    color: var(--primary-500);
}

.cover-preview i {
    font-size: 3rem;
}

.cover-preview img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* Manual Form */
.manual-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

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

.form-group label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group label .required {
    color: var(--error);
}

.form-group input,
.form-group textarea,
.form-group select {
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    background: var(--surface);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-400);
    box-shadow: 0 0 0 3px var(--primary-100);
}

[data-theme="dark"] .form-group input:focus,
[data-theme="dark"] .form-group textarea:focus,
[data-theme="dark"] .form-group select:focus {
    box-shadow: 0 0 0 3px rgba(78, 205, 196, 0.2);
}

.input-with-btn {
    display: flex;
    gap: var(--space-2);
}

.input-with-btn input {
    flex: 1;
}

/* ========================================
   Book Detail
   ======================================== */

.book-detail-modal-content {
    max-height: 90vh;
    overflow-y: auto;
}

.book-detail-content {
    padding: var(--space-4);
}

.book-detail-header {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.book-detail-cover {
    width: 120px;
    height: 165px;
    flex-shrink: 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--gradient-cool);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
    box-shadow: var(--shadow-lg);
}

.book-detail-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.book-detail-info h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.book-detail-info p {
    color: var(--text-secondary);
    margin-bottom: var(--space-1);
}

.book-detail-section {
    margin-bottom: var(--space-5);
}

.book-detail-section h4 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-3);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.tag {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-2) var(--space-3);
    background: var(--primary-50);
    color: var(--primary-600);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
}

[data-theme="dark"] .tag {
    background: rgba(78, 205, 196, 0.15);
    color: var(--primary-300);
}

.rating-stars {
    display: flex;
    gap: var(--space-1);
}

.rating-stars i {
    color: var(--accent-yellow);
    font-size: var(--font-size-lg);
}

.rating-stars i.empty {
    color: var(--gray-300);
}

.notes-content {
    padding: var(--space-4);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    white-space: pre-wrap;
}

/* Status Selector */
.status-selector {
    display: flex;
    gap: var(--space-2);
}

.status-option {
    flex: 1;
    padding: var(--space-3);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-lg);
    text-align: center;
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.status-option:hover {
    border-color: var(--primary-300);
}

.status-option.active {
    border-color: var(--primary-500);
    background: var(--primary-50);
    color: var(--primary-600);
}

[data-theme="dark"] .status-option.active {
    background: rgba(78, 205, 196, 0.15);
    color: var(--primary-300);
}

/* ========================================
   Home View
   ======================================== */

.home-header {
    text-align: center;
    padding: var(--space-6) 0;
}

.home-header h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--space-2);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.home-header p {
    color: var(--text-secondary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

@media (min-width: 640px) {
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.stat-card {
    padding: var(--space-4);
    background: var(--surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
}

.stat-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--space-3);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-xl);
}

.stat-icon.books {
    background: var(--primary-100);
    color: var(--primary-600);
}

.stat-icon.reading {
    background: #FEF3C7;
    color: var(--warning);
}

.stat-icon.read {
    background: #D1FAE5;
    color: var(--success);
}

.stat-icon.wishlist {
    background: #FCE7F3;
    color: #EC4899;
}

.stat-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
}

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

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-4);
}

.section-header h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.section-header a {
    font-size: var(--font-size-sm);
    color: var(--primary-500);
}

.quick-scan-card {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-5);
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    color: white;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: var(--space-6);
}

.quick-scan-card:hover {
    transform: scale(1.02);
    box-shadow: 0 8px 30px rgba(78, 205, 196, 0.4);
}

.quick-scan-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-2xl);
}

.quick-scan-text h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--space-1);
}

.quick-scan-text p {
    opacity: 0.9;
    font-size: var(--font-size-sm);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--space-10) var(--space-4);
}

.empty-state-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-4);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    font-size: 2rem;
    color: var(--text-tertiary);
}

.empty-state h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--space-2);
    color: var(--text-primary);
}

.empty-state p {
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
}

/* ========================================
   Settings View
   ======================================== */

.settings-section {
    margin-bottom: var(--space-6);
}

.settings-section h3 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-3);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.settings-list {
    background: var(--surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.settings-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4);
    border-bottom: 1px solid var(--border-light);
    cursor: pointer;
    transition: background var(--transition-fast);
}

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

.settings-item:hover {
    background: var(--bg-secondary);
}

.settings-item-left {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.settings-item-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-50);
    color: var(--primary-500);
    border-radius: var(--radius-lg);
}

[data-theme="dark"] .settings-item-icon {
    background: rgba(78, 205, 196, 0.15);
}

.settings-item-text h4 {
    font-size: var(--font-size-base);
    font-weight: 500;
}

.settings-item-text p {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

.settings-item-right {
    color: var(--text-tertiary);
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    width: 50px;
    height: 28px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    inset: 0;
    background: var(--gray-300);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 22px;
    height: 22px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--primary-500);
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(22px);
}

/* ========================================
   Toast Notifications
   ======================================== */

.toast-container {
    position: fixed;
    top: var(--space-4);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    z-index: var(--z-toast);
    pointer-events: none;
    max-width: calc(100% - var(--space-8));
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    pointer-events: auto;
    animation: toastIn var(--transition-base);
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.toast.fade-out {
    animation: toastOut var(--transition-base) forwards;
}

@keyframes toastOut {
    to {
        opacity: 0;
        transform: translateY(-20px);
    }
}

.toast-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
}

.toast.success .toast-icon {
    background: #D1FAE5;
    color: var(--success);
}

.toast.error .toast-icon {
    background: #FEE2E2;
    color: var(--error);
}

.toast.warning .toast-icon {
    background: #FEF3C7;
    color: var(--warning);
}

.toast.info .toast-icon {
    background: #DBEAFE;
    color: var(--info);
}

.toast-message {
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

/* ========================================
   Filter Panel
   ======================================== */

.filter-panel {
    display: flex;
    gap: var(--space-2);
    padding: var(--space-3) 0;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.filter-panel::-webkit-scrollbar {
    display: none;
}

.filter-chip {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    white-space: nowrap;
    transition: all var(--transition-fast);
}

.filter-chip:hover {
    border-color: var(--primary-300);
}

.filter-chip.active {
    background: var(--primary-500);
    border-color: var(--primary-500);
    color: white;
}

.filter-chip i {
    font-size: var(--font-size-xs);
}

/* ========================================
   Utilities
   ======================================== */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-4 { margin-top: var(--space-4); }
.mb-4 { margin-bottom: var(--space-4); }
.my-4 { margin-top: var(--space-4); margin-bottom: var(--space-4); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 639px) {
    .book-grid {
        grid-template-columns: 1fr;
    }
    
    .fab {
        display: none;
    }
}

@media (min-width: 1024px) {
    .bottom-nav {
        display: none;
    }
    
    .main-content {
        padding-bottom: var(--space-8);
    }
    
    /* Desktop sidebar could be added here */
}