/**
 * Sync Translator - Professional SaaS Design
 * Modern, clean, and production-ready interface
 */

/* ===== CSS Variables ===== */
:root {
    /* Brand Colors */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-color: #667eea;
    --primary-hover: #5568d3;
    --primary-light: #e0e7ff;
    --success-color: #10b981;
    --success-hover: #059669;
    --success-light: #d1fae5;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --danger-light: #fee2e2;
    --warning-color: #f59e0b;
    --warning-light: #fef3c7;

    /* Neutral Colors - Light Theme */
    --background-color: #f8fafc;
    --surface-color: #ffffff;
    --surface-elevated: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

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

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme */
body.dark-theme {
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --surface-elevated: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --border-color: #334155;
    --primary-light: #312e81;
    --success-light: #064e3b;
    --danger-light: #7f1d1d;
    --warning-light: #78350f;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Helvetica Neue', sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* ===== Container ===== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    min-height: 100vh;
}

/* ===== Header ===== */
.header {
    margin-bottom: var(--spacing-2xl);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) 0;
}

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

.brand-icon {
    width: 48px;
    height: 48px;
    padding: var(--spacing-sm);
    background: var(--primary-gradient);
    border-radius: var(--radius-lg);
    color: white;
}

.logo {
    font-size: 1.75rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.25rem;
}

.subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ===== Screens ===== */
.screen {
    display: none;
    animation: fadeIn var(--transition-base);
}

.screen.active {
    display: block;
}

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

/* ===== Hero Section ===== */
.hero-section {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.hero-content {
    max-width: 700px;
    margin: 0 auto;
}

.hero-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    background: var(--primary-gradient);
    border-radius: var(--radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
}

.hero-icon i {
    width: 40px;
    height: 40px;
    color: white;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== Cards ===== */
.card {
    background: var(--surface-color);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: box-shadow var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    background: var(--background-color);
}

.card-header i {
    width: 20px;
    height: 20px;
    color: var(--primary-color);
}

.card-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
}

.card-content {
    padding: var(--spacing-xl);
}

/* ===== Setup Card ===== */
.setup-card {
    max-width: 600px;
    margin: 0 auto var(--spacing-3xl);
}

.setup-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--primary-gradient);
    color: white;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.setup-header i {
    width: 24px;
    height: 24px;
}

.setup-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.setup-card .form {
    background: var(--surface-color);
    padding: var(--spacing-xl);
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    border-top: none;
}

/* ===== Form Elements ===== */
.form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

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

.form-group label {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.form-group label i {
    width: 18px;
    height: 18px;
    color: var(--primary-color);
}

.field-hint {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: -0.25rem;
}

.select {
    padding: 0.875rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--surface-color);
    color: var(--text-primary);
    transition: all var(--transition-fast);
    cursor: pointer;
    font-weight: 500;
}

.select:hover {
    border-color: var(--primary-color);
}

.select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

/* ===== Feature Highlights ===== */
.feature-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--background-color);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.feature-item i {
    width: 18px;
    height: 18px;
    color: var(--success-color);
}

/* ===== Info Cards Grid ===== */
.info-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1000px;
    margin: 0 auto;
}

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

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

.info-card i {
    width: 40px;
    height: 40px;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.info-card h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.info-card p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== Buttons ===== */
.btn {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    white-space: nowrap;
}

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

.btn i {
    width: 18px;
    height: 18px;
}

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

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-success:hover:not(:disabled) {
    background: var(--success-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

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

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

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

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

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
    width: 100%;
}

.btn-broadcast {
    background: var(--success-color);
    color: white;
    position: relative;
    min-height: 56px;
}

.btn-broadcast:hover:not(:disabled) {
    background: var(--success-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-broadcast.recording {
    background: var(--danger-color);
}

.btn-broadcast.recording:hover:not(:disabled) {
    background: var(--danger-hover);
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0.5rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: var(--surface-color);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background: var(--background-color);
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.btn-icon i {
    width: 20px;
    height: 20px;
}

/* ===== Dashboard Layout ===== */
.status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
}

.status-bar-left,
.status-bar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.room-badge,
.language-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--background-color);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    border: 1px solid var(--border-color);
}

.room-badge i,
.language-badge i {
    width: 16px;
    height: 16px;
    color: var(--primary-color);
}

.room-code {
    font-family: 'Monaco', 'Courier New', monospace;
    color: var(--primary-color);
    font-size: 1rem;
}

.connection-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-muted);
    transition: background var(--transition-base);
}

.status-indicator.connected {
    background: var(--success-color);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    }
    50% {
        opacity: 0.8;
        box-shadow: 0 0 0 8px rgba(16, 185, 129, 0);
    }
}

.status-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.dashboard-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* ===== Share Card ===== */
.share-hint {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.qr-wrapper {
    display: flex;
    justify-content: center;
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
}

.qr-code {
    display: flex;
    justify-content: center;
    align-items: center;
}

.link-share {
    display: flex;
    gap: var(--spacing-sm);
}

.link-input {
    flex: 1;
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--background-color);
    color: var(--text-primary);
    font-family: 'Monaco', 'Courier New', monospace;
}

.link-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

/* ===== Stats Grid ===== */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--background-color);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.stat-item i {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
}

.stat-content {
    flex: 1;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ===== Recording Indicator ===== */
.recording-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: transparent;
    transition: background var(--transition-base);
}

.recording-indicator.active {
    background: white;
    animation: recordingPulse 1s infinite;
}

@keyframes recordingPulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.5;
        transform: scale(0.8);
    }
}

/* ===== Transcript ===== */
.transcript-content {
    padding: 0;
}

.transcript-container {
    min-height: 500px;
    max-height: 600px;
    overflow-y: auto;
    padding: var(--spacing-lg);
    background: var(--background-color);
}

.transcript-container::-webkit-scrollbar {
    width: 8px;
}

.transcript-container::-webkit-scrollbar-track {
    background: var(--background-color);
}

.transcript-container::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-sm);
}

.transcript-container::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

.transcript-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-3xl);
    color: var(--text-muted);
    min-height: 500px;
}

.transcript-empty i {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-lg);
    opacity: 0.5;
}

.transcript-empty p {
    font-size: 1.125rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.transcript-empty small {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.transcript-segment {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--surface-color);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--success-color);
    line-height: 1.6;
    font-size: 1rem;
}

.transcript-confirmed {
    color: var(--text-primary);
    font-weight: 400;
}

.transcript-tentative {
    color: var(--text-secondary);
    font-style: italic;
    opacity: 0.8;
    border-left-color: var(--warning-color);
}

/* ===== Error Toast ===== */
.error-toast {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    background: var(--danger-color);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    max-width: 400px;
    animation: slideInRight var(--transition-base);
    z-index: 1000;
}

.error-toast.hidden {
    display: none;
}

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

.error-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
}

.error-icon {
    width: 24px;
    height: 24px;
}

.error-message {
    font-size: 0.875rem;
    line-height: 1.4;
    font-weight: 500;
}

.btn-close {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background var(--transition-fast);
}

.btn-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

.btn-close i {
    width: 18px;
    height: 18px;
}

/* ===== Back Action ===== */
.back-action {
    text-align: center;
    margin-top: var(--spacing-xl);
}

/* ===== Notification ===== */
.notification {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    font-size: 0.875rem;
    font-weight: 500;
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: 1000;
}

.notification.show {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .hero-title {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }

    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }

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

    .hero-title {
        font-size: 1.75rem;
    }

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

    .info-cards {
        grid-template-columns: 1fr;
    }

    .status-bar {
        flex-direction: column;
        gap: var(--spacing-md);
    }

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

    .link-share {
        flex-direction: column;
    }

    .error-toast,
    .notification {
        left: var(--spacing-md);
        right: var(--spacing-md);
        max-width: none;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.5rem;
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .card-content,
    .setup-card .form {
        padding: var(--spacing-lg);
    }
}

/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

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

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}