/* Modern Dark Theme CSS for AI Summarizer */

/* CSS Variables for Theme */
:root {
    /* Dark Theme Colors */
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --bg-card: #1e1e1e;
    --bg-overlay: rgba(0, 0, 0, 0.8);
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #808080;
    --text-accent: #00d4ff;
    
    /* Accent Colors */
    --accent-primary: #00d4ff;
    --accent-secondary: #0099cc;
    --accent-success: #00ff88;
    --accent-warning: #ffaa00;
    --accent-error: #ff4444;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #0099cc 100%);
    --gradient-secondary: linear-gradient(135deg, #1e1e1e 0%, #2a2a2a 100%);
    --gradient-hero: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 50%, #0a0a0a 100%);
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.3);
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Light Theme (for future toggle) */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --bg-card: #ffffff;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* App Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header Styles */
.header {
    background: var(--bg-secondary);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
    box-shadow: var(--shadow-glow);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.logo-text h1 {
    font-size: 24px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 400;
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.theme-toggle {
    background: var(--bg-tertiary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-normal);
}

.theme-toggle:hover {
    background: var(--accent-primary);
    color: white;
    transform: translateY(-2px);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Hero Section */
.hero {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-2xl) 0;
}

.hero-content h2 {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.stat {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition-normal);
}

.stat:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-primary);
}

.stat i {
    font-size: 20px;
    color: var(--accent-primary);
}

.stat span {
    font-weight: 600;
    color: var(--text-primary);
}

/* Tabs Container */
.tabs-container {
    margin-bottom: var(--spacing-xl);
}

.tabs {
    display: flex;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm);
    border: 1px solid rgba(255, 255, 255, 0.1);
    max-width: 400px;
    margin: 0 auto;
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    font-weight: 500;
}

.tab-btn.active {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.tab-btn:hover:not(.active) {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.tab-btn i {
    font-size: 16px;
}

/* Content Area */
.content-area {
    position: relative;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

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

/* Upload Card */
.upload-card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
    border: 2px dashed rgba(255, 255, 255, 0.1);
    transition: var(--transition-normal);
}

.upload-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
}

.upload-icon {
    font-size: 64px;
    color: var(--accent-primary);
    margin-bottom: var(--spacing-lg);
}

.upload-card h3 {
    font-size: 24px;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.upload-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.file-upload-area {
    position: relative;
    margin-bottom: var(--spacing-xl);
}

.file-upload-area input[type="file"] {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 2;
}

.upload-placeholder {
    background: var(--bg-tertiary);
    border: 2px dashed rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    transition: var(--transition-normal);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.upload-placeholder:hover {
    border-color: var(--accent-primary);
    background: rgba(0, 212, 255, 0.1);
}

.upload-placeholder i {
    font-size: 48px;
    color: var(--accent-primary);
}

.upload-placeholder span {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.upload-placeholder small {
    color: var(--text-secondary);
}

/* Text Card */
.text-card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.text-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.text-header h3 {
    font-size: 24px;
    color: var(--text-primary);
}

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

.text-options label {
    color: var(--text-secondary);
    font-weight: 500;
}

.text-options select {
    background: var(--bg-tertiary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition-normal);
}

.text-options select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.2);
}

/* Custom Tooltip Styling */
.text-options select option {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: var(--spacing-sm);
}

.text-options select option:hover {
    background: var(--accent-primary);
    color: white;
}

/* Tooltip enhancement */
.text-options select option[title]:hover::after {
    content: attr(title);
    position: absolute;
    background: var(--bg-card);
    border: 1px solid var(--accent-primary);
    border-radius: var(--radius-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--text-primary);
    font-size: 12px;
    white-space: nowrap;
    z-index: 1000;
    margin-top: 20px;
    box-shadow: var(--shadow-md);
}

.textarea-container {
    position: relative;
    margin-bottom: var(--spacing-xl);
}

#input-text {
    width: 100%;
    min-height: 200px;
    background: var(--bg-tertiary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    color: var(--text-primary);
    font-size: 16px;
    line-height: 1.6;
    resize: vertical;
    transition: var(--transition-normal);
    font-family: inherit;
}

#input-text:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.2);
}

#input-text::placeholder {
    color: var(--text-muted);
}

.textarea-footer {
    position: absolute;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
}

.char-count {
    font-size: 12px;
    color: var(--text-muted);
    background: var(--bg-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

/* Submit Button */
.submit-btn {
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg) var(--spacing-2xl);
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    max-width: 300px;
    margin: 0 auto;
}

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

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

.submit-btn i {
    font-size: 18px;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.loading-content {
    text-align: center;
    color: var(--text-primary);
}

.loading-spinner {
    position: relative;
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
}

.spinner-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 3px solid transparent;
    border-top: 3px solid var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.spinner-ring:nth-child(2) {
    border-top-color: var(--accent-secondary);
    animation-delay: 0.3s;
}

.spinner-ring:nth-child(3) {
    border-top-color: var(--accent-success);
    animation-delay: 0.6s;
}

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

.loading-content h3 {
    font-size: 24px;
    margin-bottom: var(--spacing-sm);
}

.loading-content p {
    color: var(--text-secondary);
}

/* Result Section */
.result-section {
    margin-top: var(--spacing-2xl);
    animation: slideUp 0.5s ease;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.result-card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-lg);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.result-header h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 20px;
    color: var(--accent-success);
}

.result-header h3 i {
    font-size: 24px;
}

.close-btn {
    background: var(--bg-tertiary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-normal);
}

.close-btn:hover {
    background: var(--accent-error);
    color: white;
}

.summary-content {
    margin-bottom: var(--spacing-xl);
}

.summary-text {
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    line-height: 1.8;
    font-size: 16px;
    color: var(--text-primary);
    border-left: 4px solid var(--accent-primary);
}

.result-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
}

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

.stat-item i {
    font-size: 20px;
    color: var(--accent-primary);
    width: 24px;
}

.stat-item div {
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 12px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

.result-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
}

.action-btn {
    background: var(--bg-tertiary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 500;
    min-width: 160px;
    justify-content: center;
}

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

.download-btn:hover {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

.copy-btn:hover {
    background: var(--accent-success);
    color: white;
    border-color: var(--accent-success);
}

.new-btn:hover {
    background: var(--accent-secondary);
    color: white;
    border-color: var(--accent-secondary);
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-xl);
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-content p {
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-normal);
}

.footer-links a:hover {
    color: var(--accent-primary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        padding: var(--spacing-md);
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .logo-container {
        flex-direction: column;
        text-align: center;
    }
    
    .main-content {
        padding: var(--spacing-md);
    }
    
    .hero-content h2 {
        font-size: 32px;
    }
    
    .hero-content p {
        font-size: 16px;
    }
    
    .hero-stats {
        flex-direction: column;
        align-items: center;
    }
    
    .text-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .text-options {
        justify-content: center;
    }
    
    .result-stats {
        grid-template-columns: 1fr;
    }
    
    .result-actions {
        flex-direction: column;
    }
    
    .action-btn {
        width: 100%;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .tabs {
        flex-direction: column;
        max-width: none;
    }
    
    .upload-card,
    .text-card,
    .result-card {
        padding: var(--spacing-lg);
    }
    
    .hero-content h2 {
        font-size: 28px;
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn 0.3s ease;
}

.slide-up {
    animation: slideUp 0.5s ease;
}

/* Warning Messages */
.warning-message {
    background: linear-gradient(135deg, rgba(255, 170, 0, 0.1) 0%, rgba(255, 68, 68, 0.1) 100%);
    border: 1px solid rgba(255, 170, 0, 0.3);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    font-size: 14px;
    line-height: 1.5;
}

.warning-message i {
    color: var(--accent-warning);
    font-size: 16px;
    margin-top: 2px;
    flex-shrink: 0;
}

.warning-message span {
    color: var(--text-secondary);
}

.warning-message strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* Info variant for text warnings */
.warning-message.info {
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1) 0%, rgba(0, 153, 204, 0.1) 100%);
    border-color: rgba(0, 212, 255, 0.3);
}

.warning-message.info i {
    color: var(--accent-primary);
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-secondary);
}