/* ============================================
   LINGUAFLOW - Smart Translation Hub
   Design System: Indigo Ink + Modern Tech
   ============================================ */

/* CSS Variables */
:root {
    /* Colors - Indigo Ink Palette */
    --primary-dark: #1B0A3C;
    --primary: #3D1E7C;
    --primary-light: #7B68EE;
    --accent: #E8E0F0;
    --accent-warm: #C9A87C;
    
    /* Neutrals */
    --bg: #0A0A0F;
    --surface: #14141A;
    --surface-elevated: #1E1E28;
    --border: #2A2A3A;
    
    /* Text */
    --text-primary: #FFFFFF;
    --text-secondary: #A0A0B0;
    --text-muted: #6B6B7B;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #3D1E7C 0%, #7B68EE 100%);
    --gradient-glow: radial-gradient(circle at 50% 50%, rgba(123, 104, 238, 0.15) 0%, transparent 70%);
    
    /* Typography */
    --font-display: 'Plus Jakarta Sans', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    --font-accent: 'Instrument Serif', serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 5rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

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

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

/* Selection */
::selection {
    background: var(--primary-light);
    color: var(--text-primary);
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-light);
}

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-xl);
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--primary-light);
}

.brand-name {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: var(--space-xl);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-fast);
}

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

.nav-link:hover::after {
    width: 100%;
}

.nav-cta {
    padding: var(--space-xs) var(--space-md);
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(123, 104, 238, 0.3);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: calc(var(--space-2xl) + 80px) var(--space-xl) var(--space-2xl);
    max-width: 1400px;
    margin: 0 auto;
    gap: var(--space-2xl);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: var(--gradient-glow);
    pointer-events: none;
}

.hero-content {
    flex: 1;
    max-width: 600px;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-md);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: #00FF88;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-md);
}

.title-accent {
    display: block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    line-height: 1.7;
}

.hero-cta-group {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-normal);
    border: none;
}

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

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(123, 104, 238, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border);
}

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

/* Hero Visual */
.hero-visual {
    flex: 1;
    position: relative;
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-globe {
    position: absolute;
    width: 400px;
    height: 400px;
    opacity: 0.3;
    animation: rotate 30s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.globe-svg {
    width: 100%;
    height: 100%;
    color: var(--primary-light);
}

.floating-card {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-md);
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    animation: float 6s ease-in-out infinite;
}

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

.floating-card span {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.card-1 {
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.card-2 {
    top: 5%;
    right: 15%;
    animation-delay: 1.5s;
}

.card-3 {
    bottom: 20%;
    left: 5%;
    animation-delay: 3s;
}

.card-4 {
    bottom: 15%;
    right: 10%;
    animation-delay: 4.5s;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* ============================================
   FEATURES SECTION
   ============================================ */
.features {
    padding: var(--space-2xl) var(--space-xl);
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section-label {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.85rem;
    color: var(--primary-light);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--space-md);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.section-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.feature-card {
    padding: var(--space-xl);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    transition: var(--transition-normal);
    cursor: pointer;
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-light);
    box-shadow: 0 20px 40px rgba(123, 104, 238, 0.15);
}

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
    color: var(--text-primary);
}

.feature-card h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: var(--space-md);
}

.feature-tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(123, 104, 238, 0.1);
    border: 1px solid rgba(123, 104, 238, 0.3);
    border-radius: 100px;
    font-size: 0.75rem;
    color: var(--primary-light);
    font-weight: 600;
}

/* ============================================
   TRANSLATION HUB
   ============================================ */
.translate-hub {
    padding: var(--space-2xl) var(--space-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.mode-switcher {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
}

.mode-btn {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.mode-btn:hover {
    border-color: var(--primary-light);
    color: var(--text-primary);
}

.mode-btn.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: var(--text-primary);
}

.mode-btn span {
    font-size: 1.2rem;
}

/* Translation Panels */
.translate-panel {
    display: none;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
}

.translate-panel.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

/* Language Bar */
.language-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

.lang-select {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.lang-select label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.lang-select select {
    padding: var(--space-sm) var(--space-md);
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    min-width: 150px;
    cursor: pointer;
}

.swap-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    border-radius: 50%;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    margin-top: 18px;
}

.swap-btn:hover {
    border-color: var(--primary-light);
    color: var(--primary-light);
    transform: rotate(180deg);
}

/* Text Areas */
.text-areas {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.input-area, .output-area {
    position: relative;
}

.input-area textarea,
.output-area .translation-output {
    width: 100%;
    min-height: 200px;
    padding: var(--space-md);
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    line-height: 1.6;
    resize: vertical;
    font-family: inherit;
}

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

.input-area textarea:focus {
    outline: none;
    border-color: var(--primary-light);
}

.translation-output {
    overflow-y: auto;
}

.translation-output .placeholder {
    color: var(--text-muted);
}

.input-tools, .output-tools {
    position: absolute;
    bottom: var(--space-sm);
    right: var(--space-sm);
    display: flex;
    gap: var(--space-xs);
    align-items: center;
}

.tool-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.tool-btn:hover {
    border-color: var(--primary-light);
    color: var(--primary-light);
}

.char-count {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-left: var(--space-xs);
}

/* Translate Button */
.translate-btn {
    width: 100%;
    padding: var(--space-md);
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

.translate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(123, 104, 238, 0.3);
}

.translate-btn svg {
    width: 24px;
    height: 24px;
}

/* Upload Zones */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    text-align: center;
    cursor: pointer;
    transition: var(--transition-fast);
    margin-bottom: var(--space-lg);
}

.upload-zone:hover {
    border-color: var(--primary-light);
    background: rgba(123, 104, 238, 0.05);
}

.upload-icon {
    color: var(--primary-light);
    margin-bottom: var(--space-md);
}

.upload-zone h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-xs);
}

.upload-zone p {
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

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

/* Options */
.video-options, .audio-options, .screen-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

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

.option-group label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.option-group select {
    padding: var(--space-sm);
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.95rem;
}

.toggle-group {
    display: flex;
    gap: var(--space-xs);
    flex-wrap: wrap;
}

.toggle-btn {
    padding: var(--space-xs) var(--space-sm);
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.toggle-btn:hover {
    border-color: var(--primary-light);
    color: var(--text-primary);
}

.toggle-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--text-primary);
}

/* Screen Preview */
.screen-preview {
    display: flex;
    justify-content: center;
    margin-bottom: var(--space-lg);
}

.screen-mockup {
    width: 320px;
    height: 200px;
    background: var(--surface-elevated);
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
}

.screen-header {
    height: 24px;
    background: var(--border);
    display: flex;
    align-items: center;
    padding: 0 var(--space-sm);
}

.screen-dots {
    display: flex;
    gap: 6px;
}

.screen-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-muted);
}

.screen-dots span:first-child { background: #FF5F56; }
.screen-dots span:nth-child(2) { background: #FFBD2E; }
.screen-dots span:last-child { background: #27C93F; }

.screen-content {
    padding: var(--space-md);
    position: relative;
    height: calc(100% - 24px);
}

.translated-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
}

.overlay-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.translation-bubble {
    background: var(--primary);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    max-width: 80%;
}

.translation-bubble span {
    display: block;
    font-size: 0.85rem;
}

.translation-bubble span:first-child {
    color: var(--text-secondary);
    font-size: 0.75rem;
    margin-bottom: 2px;
}

.translation-bubble .translated {
    color: var(--text-primary);
    font-weight: 600;
}

/* Live Button */
.live-btn {
    position: relative;
    overflow: hidden;
}

.live-indicator {
    width: 10px;
    height: 10px;
    background: #FF4444;
    border-radius: 50%;
    animation: livePulse 1.5s infinite;
}

@keyframes livePulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.2); }
}

/* ============================================
   STATS SECTION
   ============================================ */
.stats {
    display: flex;
    justify-content: center;
    gap: var(--space-2xl);
    padding: var(--space-2xl) var(--space-xl);
    flex-wrap: wrap;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    margin: var(--space-2xl) 0;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    padding: var(--space-2xl) var(--space-xl);
    border-top: 1px solid var(--border);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.footer-brand .logo-icon {
    width: 40px;
    height: 40px;
    color: var(--primary-light);
}

.footer-brand span {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
}

.footer-desc {
    color: var(--text-secondary);
    max-width: 400px;
    margin: 0 auto var(--space-lg);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: calc(var(--space-2xl) + 100px);
    }
    
    .hero-cta-group {
        justify-content: center;
    }
    
    .hero-visual {
        height: 350px;
    }
    
    .hero-globe {
        width: 300px;
        height: 300px;
    }
    
    .text-areas {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: var(--space-sm) var(--space-md);
    }
    
    .nav-links {
        display: none;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .stats {
        gap: var(--space-xl);
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
    
    .mode-switcher {
        gap: var(--space-xs);
    }
    
    .mode-btn {
        padding: var(--space-xs) var(--space-sm);
        font-size: 0.9rem;
    }
    
    .language-bar {
        flex-direction: column;
    }
    
    .swap-btn {
        margin-top: 0;
        transform: rotate(90deg);
    }
    
    .video-options, .audio-options, .screen-options {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: calc(var(--space-xl) + 80px) var(--space-md) var(--space-xl);
    }
    
    .translate-hub {
        padding: var(--space-xl) var(--space-md);
    }
    
    .translate-panel {
        padding: var(--space-md);
    }
    
    .upload-zone {
        padding: var(--space-xl) var(--space-md);
    }
}

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

.loading {
    opacity: 0.7;
    pointer-events: none;
}

.success {
    color: #00FF88 !important;
}

.error {
    color: #FF4444 !important;
}