/* Nobu Tools - Common Styles v1.0.0 */
/* Shared CSS for all Nobu Tools pages */

/* ========================================
   Reset & Base
   ======================================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

:focus { outline: none; }
button:focus-visible,
input[type="file"]:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    html { scroll-behavior: auto; }
}

/* ========================================
   CSS Variables - Light Mode (Default)
   ======================================== */
:root {
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
    
    /* Primary palette */
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    
    /* Semantic colors */
    --success: #059669;
    --success-light: #ecfdf5;
    --danger: #dc2626;
    --danger-light: #fef2f2;
    --warning: #f59e0b;
    --warning-light: #fffbeb;
    
    /* Neutrals - Light Mode */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #6b7280;
    --text-faint: #9ca3af;
    
    /* Legacy neutral vars for compatibility */
    --white: #ffffff;
    --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;
    
    /* Effects */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 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);
    
    --radius-sm: 6px;
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
}

/* ========================================
   Dark Mode
   ======================================== */
[data-theme="dark"] {
    --primary: #3b82f6;
    --primary-hover: #60a5fa;
    --primary-light: #1e3a5f;
    
    --success: #10b981;
    --success-light: #064e3b;
    --danger: #f87171;
    --danger-light: #7f1d1d;
    --warning: #fbbf24;
    --warning-light: #78350f;
    
    --bg-primary: #1a1a2e;
    --bg-secondary: #16162a;
    --bg-tertiary: #232342;
    --border-color: #2d2d4a;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --text-faint: #64748b;
    
    --white: #1a1a2e;
    --gray-50: #232342;
    --gray-100: #2d2d4a;
    --gray-200: #3d3d5c;
    --gray-300: #4d4d6a;
    --gray-400: #7a7a9a;
    --gray-500: #94a3b8;
    --gray-600: #cbd5e1;
    --gray-700: #e2e8f0;
    --gray-800: #f1f5f9;
    --gray-900: #f8fafc;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.4), 0 1px 2px -1px rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.3);
}

/* Auto dark mode based on system preference */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --primary: #3b82f6;
        --primary-hover: #60a5fa;
        --primary-light: #1e3a5f;
        --success: #10b981;
        --success-light: #064e3b;
        --danger: #f87171;
        --danger-light: #7f1d1d;
        --warning: #fbbf24;
        --warning-light: #78350f;
        --bg-primary: #1a1a2e;
        --bg-secondary: #16162a;
        --bg-tertiary: #232342;
        --border-color: #2d2d4a;
        --text-primary: #f1f5f9;
        --text-secondary: #cbd5e1;
        --text-muted: #94a3b8;
        --text-faint: #64748b;
        --white: #1a1a2e;
        --gray-50: #232342;
        --gray-100: #2d2d4a;
        --gray-200: #3d3d5c;
        --gray-300: #4d4d6a;
        --gray-400: #7a7a9a;
        --gray-500: #94a3b8;
        --gray-600: #cbd5e1;
        --gray-700: #e2e8f0;
        --gray-800: #f1f5f9;
        --gray-900: #f8fafc;
        --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
        --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.4), 0 1px 2px -1px rgb(0 0 0 / 0.3);
        --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.3);
        --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.3);
    }
}

/* ========================================
   Theme Toggle Button
   ======================================== */
.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 8px;
    cursor: pointer;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
    width: 38px;
    height: 38px;
}

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

.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-sun { display: block; }
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]):not([data-theme="dark"]) .theme-toggle .icon-sun { display: none; }
    :root:not([data-theme="light"]):not([data-theme="dark"]) .theme-toggle .icon-moon { display: block; }
}

/* ========================================
   Body
   ======================================== */
body {
    font-family: var(--font-sans);
    background: var(--bg-secondary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* ========================================
   Header
   ======================================== */
.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 24px;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-content.narrow {
    max-width: 800px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo-icon { font-size: 1.5rem; }
.logo h1 { font-size: 1.25rem; font-weight: 700; color: var(--text-primary); }
.logo .by-nobu { font-weight: 400; color: var(--text-muted); font-size: 0.85rem; }

.header-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.btn-about {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: var(--radius);
    transition: all 0.15s;
    font-weight: 500;
    font-size: 0.95rem;
}

.btn-about:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* ========================================
   Container
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 24px;
}

.container.narrow {
    max-width: 800px;
    padding: 40px 24px;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    width: 100%;
    padding: 10px 16px;
    border: none;
    border-radius: var(--radius);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    font-size: 0.95rem;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-tertiary);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-icon {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 8px;
    cursor: pointer;
    color: var(--text-muted);
    transition: all 0.15s;
    font-size: 1rem;
}

.btn-icon:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-color: var(--gray-300);
}

.btn-icon.danger:hover {
    background: var(--danger-light);
    color: var(--danger);
    border-color: var(--danger);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    text-align: center;
    padding: 32px 24px;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    margin-top: 64px;
}

.footer a {
    color: var(--primary);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

.footer-copyright {
    margin-top: 8px;
    font-size: 0.85rem;
}

/* ========================================
   Upload Area (Tool Pages)
   ======================================== */
.upload-section {
    background: var(--bg-primary);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: left;
    margin-bottom: 24px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 20px;
}

.upload-section:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}

.upload-section.dragover {
    border-color: var(--primary);
    background: var(--primary-light);
    transform: scale(1.01);
}

.upload-icon {
    font-size: 2.5rem;
    opacity: 0.8;
    flex-shrink: 0;
}

.upload-section h2 {
    font-size: 1.1rem;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.upload-section p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin: 0;
}

#file-input {
    display: none;
}

/* ========================================
   File List (Tool Pages)
   ======================================== */
.files-section {
    display: none;
}

.files-section.active {
    display: block;
}

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

.section-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.file-list {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    transition: background 0.15s;
}

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

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

.drag-handle {
    cursor: grab;
    color: var(--text-muted);
    font-size: 1.25rem;
    user-select: none;
}

.drag-handle:active {
    cursor: grabbing;
}

.file-icon {
    font-size: 2rem;
}

.file-info {
    flex: 1;
}

.file-name {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.file-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.file-actions {
    display: flex;
    gap: 8px;
}

/* ========================================
   Action Cards (Tool Pages)
   ======================================== */
.action-section {
    margin-top: 24px;
}

.action-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.action-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: all 0.2s;
}

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

.action-card h4 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.action-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}

/* ========================================
   Page Range Input (Tool Pages)
   ======================================== */
.page-range-input {
    margin-top: 12px;
}

.page-range-input label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.page-range-input input {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.9rem;
}

.page-range-input input::placeholder {
    color: var(--text-faint);
}

/* ========================================
   Status Messages (Tool Pages)
   ======================================== */
.status-message {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-top: 16px;
    display: none;
}

.status-message.active {
    display: block;
}

.status-message.success {
    background: var(--success-light);
    color: var(--success);
}

.status-message.error {
    background: var(--danger-light);
    color: var(--danger);
}

.status-message.info {
    background: var(--primary-light);
    color: var(--primary);
}

/* ========================================
   Loading State
   ======================================== */
.loading {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* ========================================
   Hero Section (About Pages)
   ======================================== */
.hero {
    text-align: center;
    margin-bottom: 48px;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.hero p {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* ========================================
   Mission Section (About Pages)
   ======================================== */
.mission {
    background: linear-gradient(135deg, var(--primary-light), var(--bg-primary));
    border: 1px solid var(--primary);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 24px;
    text-align: center;
}

.mission-icon { font-size: 3rem; margin-bottom: 16px; }
.mission h2 { font-size: 1.5rem; font-weight: 600; margin-bottom: 16px; }
.mission p { color: var(--text-secondary); max-width: 600px; margin: 0 auto 16px; }

/* ========================================
   Card Component (About Pages)
   ======================================== */
.card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 24px;
}

.card h2 {
    font-size: 1.5rem;
    margin-bottom: 16px;
}

.card h3 {
    font-size: 1.25rem;
    margin: 24px 0 12px;
}

.card p {
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.card ul {
    list-style: none;
    padding: 0;
}

.card ul li {
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
    color: var(--text-secondary);
}

.card ul li::before {
    content: '•';
    position: absolute;
    left: 8px;
    color: var(--primary);
    font-weight: bold;
}

/* ========================================
   Feature Grid (About Pages)
   ======================================== */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
    margin-top: 16px;
}

.feature-item {
    background: var(--bg-secondary);
    padding: 16px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.feature-item strong {
    display: block;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.feature-item span {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ========================================
   Use Cases (About Pages)
   ======================================== */
.use-cases {
    display: grid;
    gap: 16px;
}

.use-case {
    display: flex;
    gap: 16px;
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.use-case-icon {
    font-size: 2rem;
}

.use-case h4 {
    margin-bottom: 4px;
    color: var(--text-primary);
}

.use-case p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ========================================
   FAQ (About Pages)
   ======================================== */
.faq-item {
    margin-bottom: 24px;
}

.faq-item h4 {
    color: var(--text-primary);
    margin-bottom: 8px;
}

.faq-item p {
    margin: 0;
}

/* ========================================
   CTA Section (About Pages)
   ======================================== */
.cta {
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    color: white;
    padding: 48px 32px;
    border-radius: var(--radius-lg);
    text-align: center;
    margin-top: 48px;
}

.cta h2 {
    font-size: 2rem;
    margin-bottom: 12px;
}

.cta p {
    margin-bottom: 24px;
    opacity: 0.9;
}

.cta a {
    display: inline-block;
    background: white;
    color: var(--primary);
    padding: 12px 32px;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s;
}

.cta a:hover {
    transform: scale(1.05);
}

/* ========================================
   Description Section (Tool Pages)
   ======================================== */
.description-section {
    max-width: 1200px;
    margin: 48px auto 0;
    padding: 0 24px;
}

.description-section h2 {
    font-size: 1.75rem;
    margin-bottom: 16px;
}

.description-section h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.description-section p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 32px;
}

.description-section ul {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 32px;
    padding-left: 24px;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 16px;
    }
    
    .action-grid {
        grid-template-columns: 1fr;
    }
}