/* ===================================
   CSS Variables & Design Tokens
   Eagle-inspired Design System
   =================================== */
:root {
    /* Colors - Eagle-inspired palette with amber/gold accents */
    --primary-gradient: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    --secondary-gradient: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    --accent-gradient: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --dark-gradient: linear-gradient(180deg, #0c0c0e 0%, #18181b 50%, #09090b 100%);

    --primary-color: #f59e0b;
    --primary-light: #fbbf24;
    --primary-dark: #d97706;
    --secondary-color: #3b82f6;
    --accent-color: #10b981;

    /* Neutral colors - Refined dark theme */
    --bg-dark: #09090b;
    --bg-darker: #050506;
    --bg-card: rgba(24, 24, 27, 0.8);
    --bg-card-hover: rgba(39, 39, 42, 0.9);
    --border-color: rgba(63, 63, 70, 0.5);
    --border-light: rgba(63, 63, 70, 0.3);

    /* Text colors */
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;

    /* Glassmorphism - Subtle and refined */
    --glass-bg: rgba(24, 24, 27, 0.6);
    --glass-border: rgba(63, 63, 70, 0.4);
    --glass-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border radius - Softer corners */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.25rem;
    --radius-full: 9999px;

    /* Transitions - Smooth and responsive */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);

    /* Typography */
    --font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

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

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

a:hover {
    color: var(--accent-color);
}

/* ===================================
   Container
   =================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===================================
   Header
   =================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 600;
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--text-primary);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    padding: var(--spacing-lg);
    flex-direction: column;
    gap: var(--spacing-md);
    z-index: 99;
}

.mobile-menu.active {
    display: flex;
}

.mobile-nav-link {
    color: var(--text-secondary);
    font-size: 1.1rem;
    padding: var(--spacing-sm) 0;
}

/* ===================================
   Buttons - Eagle-inspired
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-family);
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    letter-spacing: 0.01em;
}

.btn-primary {
    background: var(--primary-gradient);
    color: #000;
    box-shadow: 0 2px 12px rgba(245, 158, 11, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.45);
    filter: brightness(1.05);
}

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

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

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

.btn-settings {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-md);
}

.btn-settings:hover {
    background: var(--bg-card);
    color: var(--text-primary);
    border-color: var(--text-muted);
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: 1.1rem;
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 100px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 80%, rgba(245, 158, 11, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(59, 130, 246, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(16, 185, 129, 0.05) 0%, transparent 40%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    width: 100%;
    text-align: center;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.gradient-text {
    background: linear-gradient(135deg, #fafafa 0%, #fbbf24 50%, #f59e0b 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

/* ===================================
   Input Section
   =================================== */
.input-section {
    max-width: 800px;
    margin: 0 auto var(--spacing-2xl);
}

.input-wrapper {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
}

.url-input {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-family);
    outline: none;
}

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

.btn-summarize {
    padding: var(--spacing-md) var(--spacing-xl);
    white-space: nowrap;
}

.btn-summarize .btn-icon {
    width: auto;
    height: auto;
    background: none;
    border: none;
    transition: transform var(--transition-fast);
}

.btn-summarize:hover .btn-icon {
    transform: translateX(4px);
}

.input-hint {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ===================================
   Result Section - Eagle-inspired
   =================================== */
.result-section {
    max-width: 1000px;
    margin: 0 auto;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(20px);
    overflow: hidden;
    animation: fadeInUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

.result-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.video-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.video-thumbnail {
    width: 120px;
    height: 68px;
    object-fit: cover;
    border-radius: var(--radius-sm);
}

.video-details {
    text-align: left;
}

.video-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-channel {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Tabs - Eagle-inspired */
.tabs {
    display: flex;
    gap: var(--spacing-sm);
}

.tab {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: var(--font-family);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tab:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.tab.active {
    background: var(--primary-gradient);
    color: #000;
    font-weight: 600;
}

.tab-icon {
    font-size: 1rem;
}

/* Tab Content */
.tab-content {
    padding: var(--spacing-lg);
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* Summary Tab */
.summary-content {
    text-align: left;
    line-height: 1.8;
}

.summary-content h3 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--primary-light);
}

.summary-content ul {
    padding-left: var(--spacing-lg);
}

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

/* Summary Blocks - Eagle-inspired */
.summary-block {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
    transition: border-color var(--transition-base);
}

.summary-block:hover {
    border-color: var(--border-light);
}

.summary-block-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(245, 158, 11, 0.08);
    border-bottom: 1px solid var(--border-color);
}

.summary-block-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-light);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

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

.btn-copy,
.btn-download {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-copy:hover,
.btn-download:hover {
    background: rgba(245, 158, 11, 0.1);
    border-color: var(--primary-light);
    color: var(--primary-light);
}

.summary-block-content {
    padding: var(--spacing-lg);
    text-align: left;
    line-height: 1.8;
}

/* Segment Item - Eagle-inspired */
.segment-item {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-light);
    transition: background var(--transition-fast);
}

.segment-item:hover {
    background: rgba(245, 158, 11, 0.03);
}

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

.segment-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.segment-time {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(245, 158, 11, 0.15);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--primary-light);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.segment-time:hover {
    background: rgba(245, 158, 11, 0.3);
}

.segment-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.segment-content {
    color: var(--text-secondary);
    line-height: 1.8;
    padding-left: calc(var(--spacing-lg) + var(--spacing-md));
}

.summary-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* Transcript Tab */
.transcript-controls {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.search-input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-family);
    outline: none;
}

.search-input:focus {
    border-color: var(--primary-light);
}

.transcript-content {
    max-height: 400px;
    overflow-y: auto;
    text-align: left;
    padding-right: var(--spacing-sm);
}

.transcript-content::-webkit-scrollbar {
    width: 6px;
}

.transcript-content::-webkit-scrollbar-track {
    background: var(--glass-bg);
    border-radius: 3px;
}

.transcript-content::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.transcript-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-light);
}

.transcript-time {
    color: var(--primary-light);
    font-size: 0.875rem;
    min-width: 60px;
    cursor: pointer;
}

.transcript-time:hover {
    text-decoration: underline;
}

.transcript-text {
    color: var(--text-secondary);
    flex: 1;
}

.transcript-text.highlight {
    background: rgba(102, 126, 234, 0.3);
    color: var(--text-primary);
}

/* ===================================
   Loading Section
   =================================== */
.loading-section {
    text-align: center;
    padding: var(--spacing-3xl);
}

.loading-spinner {
    margin-bottom: var(--spacing-lg);
}

.spinner {
    width: 50px;
    height: 50px;
    margin: 0 auto;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-light);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-text {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.loading-progress {
    width: 200px;
    height: 4px;
    background: var(--glass-bg);
    border-radius: var(--radius-full);
    margin: 0 auto;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
    width: 0%;
    transition: width 0.3s ease;
}

/* ===================================
   Error Section
   =================================== */
.error-section {
    text-align: center;
    padding: var(--spacing-2xl);
}

.error-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.error-message {
    color: #f87171;
    margin-bottom: var(--spacing-lg);
}

/* ===================================
   Steps Section - Eagle-inspired
   =================================== */
.steps-section {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    text-align: center;
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-2xl);
    background: linear-gradient(135deg, #fafafa 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.steps-grid {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.step-card {
    position: relative;
    padding: var(--spacing-xl);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    text-align: center;
    max-width: 250px;
    transition: all var(--transition-base);
}

.step-card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-3px);
    border-color: rgba(245, 158, 11, 0.3);
}

.step-number {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 30px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
}

.step-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.step-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.step-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.step-arrow {
    font-size: 1.5rem;
    color: var(--primary-light);
}

/* ===================================
   Features Section - Eagle-inspired
   =================================== */
.features-section {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, transparent 0%, rgba(245, 158, 11, 0.03) 50%, transparent 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    padding: var(--spacing-xl);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.feature-card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-3px);
    border-color: rgba(245, 158, 11, 0.3);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.feature-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.feature-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ===================================
   Use Cases Section
   =================================== */
.use-cases-section {
    padding: var(--spacing-3xl) 0;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.use-case-card {
    padding: var(--spacing-xl);
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-base);
}

.use-case-card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-5px);
}

.use-case-image {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.use-case-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.use-case-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ===================================
   FAQ Section
   =================================== */
.faq-section {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, transparent 0%, rgba(240, 147, 251, 0.03) 50%, transparent 100%);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: var(--spacing-md);
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.faq-item:hover {
    border-color: var(--primary-light);
}

.faq-question {
    width: 100%;
    padding: var(--spacing-lg);
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--primary-light);
    transition: transform var(--transition-fast);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===================================
   CTA Section
   =================================== */
.cta-section {
    padding: var(--spacing-3xl) 0;
}

.cta-content {
    text-align: center;
    padding: var(--spacing-3xl);
    background: var(--primary-gradient);
    border-radius: var(--radius-xl);
    position: relative;
    overflow: hidden;
}

.cta-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.cta-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    position: relative;
}

.cta-desc {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.cta-content .btn {
    background: white;
    color: var(--primary-dark);
    position: relative;
}

.cta-content .btn:hover {
    background: rgba(255, 255, 255, 0.9);
}

/* ===================================
   Footer
   =================================== */
.footer {
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
    background: rgba(0, 0, 0, 0.3);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand {
    max-width: 300px;
}

.footer-desc {
    color: var(--text-muted);
    margin-top: var(--spacing-md);
    font-size: 0.95rem;
}

.footer-links {
    display: flex;
    gap: var(--spacing-3xl);
}

.footer-column h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.footer-column a {
    display: block;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ===================================
   Modal
   =================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

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

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    transition: color var(--transition-fast);
}

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

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* Settings Sections */
.settings-section {
    margin-bottom: var(--spacing-xl);
}

.settings-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--primary-light);
}

/* Provider Grid */
.provider-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.provider-option {
    cursor: pointer;
}

.provider-option input {
    display: none;
}

.provider-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--glass-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.provider-option input:checked+.provider-card {
    border-color: var(--primary-light);
    background: rgba(102, 126, 234, 0.1);
}

.provider-card:hover {
    border-color: var(--primary-light);
}

.provider-icon {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

.provider-name {
    font-weight: 500;
    font-size: 0.9rem;
}

.provider-model {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Form Elements */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.form-group .hint {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.help-link {
    font-size: 0.8rem;
    color: var(--accent-color);
}

.form-input,
.form-select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.95rem;
    outline: none;
    transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
    border-color: var(--primary-light);
}

.form-select {
    cursor: pointer;
}

.form-select option {
    background: var(--bg-dark);
}

.input-with-toggle {
    position: relative;
}

.input-with-toggle input {
    padding-right: 45px;
}

.toggle-visibility {
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1rem;
}

/* Fetch Models Button */
.btn-fetch-models {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--accent-color);
    font-family: var(--font-family);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-left: auto;
}

.btn-fetch-models:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-color);
}

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

.btn-fetch-models.loading {
    animation: pulse 1s ease-in-out infinite;
}

/* Model Status */
.model-status {
    margin-top: var(--spacing-xs);
    font-size: 0.8rem;
    min-height: 1.2em;
}

.model-status.success {
    color: #4ade80;
}

.model-status.error {
    color: #f87171;
}

.model-status.loading {
    color: var(--text-muted);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    .nav {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .input-wrapper {
        flex-direction: column;
    }

    .btn-summarize {
        width: 100%;
    }

    .tabs {
        flex-wrap: wrap;
    }

    .tab {
        flex: 1;
        min-width: 100px;
        justify-content: center;
    }

    .steps-grid {
        flex-direction: column;
    }

    .step-arrow {
        transform: rotate(90deg);
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-xl);
    }

    .provider-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .mindmap-container {
        height: 350px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .provider-grid {
        grid-template-columns: 1fr;
    }

    .video-info {
        flex-direction: column;
        text-align: center;
    }

    .video-details {
        text-align: center;
    }
}

/* ===================================
   Animations
   =================================== */
@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.loading-text {
    animation: pulse 2s ease-in-out infinite;
}

/* Mind Map Node Styles */
.mindmap-node {
    cursor: pointer;
}

.mindmap-node circle {
    transition: all var(--transition-fast);
}

.mindmap-node:hover circle {
    filter: brightness(1.2);
}

.mindmap-node text {
    font-family: var(--font-family);
    fill: var(--text-primary);
    pointer-events: none;
}

.mindmap-link {
    fill: none;
    stroke: var(--border-color);
    stroke-width: 1.5px;
}