:root {
    /* Color Palette */
    --bg-primary: #0a0e1a;
    --bg-secondary: #121829;
    --bg-tertiary: #1a2035;
    --bg-glass: rgba(26, 32, 53, 0.7);

    /* Accent Colors */
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --accent-glow: rgba(99, 102, 241, 0.3);

    /* Status Colors */
    --success: #10b981;
    --success-glow: rgba(16, 185, 129, 0.3);
    --danger: #ef4444;
    --danger-glow: rgba(239, 68, 68, 0.3);
    --warning: #f59e0b;

    /* Text Colors */
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;

    /* Border & Shadow */
    --border-color: rgba(148, 163, 184, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px var(--accent-glow);

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

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

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Animated Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 30%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.container {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    z-index: 1;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-lg);
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

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

.logo-icon {
    width: 2.5rem;
    height: 2.5rem;
    color: var(--accent-primary);
    filter: drop-shadow(0 0 8px var(--accent-glow));
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.status-dot {
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background: var(--success);
    box-shadow: 0 0 8px var(--success-glow);
    animation: breathe 2s ease-in-out infinite;
}

@keyframes breathe {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.6;
        transform: scale(0.9);
    }
}

.status-indicator.recording .status-dot {
    background: var(--danger);
    box-shadow: 0 0 8px var(--danger-glow);
}

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

/* Main Content */
.main-content {
    display: grid;
    gap: var(--spacing-xl);
}

.recorder-card {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.recorder-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.card-header {
    margin-bottom: var(--spacing-xl);
}

.card-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.card-header p {
    color: var(--text-tertiary);
    font-size: 0.95rem;
}

/* Controls Section */
.controls-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.audio-control {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.checkbox-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    cursor: pointer;
    user-select: none;
}

.checkbox-container input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.checkmark {
    position: relative;
    width: 1.5rem;
    height: 1.5rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
}

.checkbox-container:hover .checkmark {
    border-color: var(--accent-primary);
}

.checkbox-container input:checked~.checkmark {
    background: var(--accent-gradient);
    border-color: var(--accent-primary);
    box-shadow: 0 0 12px var(--accent-glow);
}

.checkmark::after {
    content: '';
    position: absolute;
    display: none;
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.checkbox-container input:checked~.checkmark::after {
    display: block;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.icon {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--accent-primary);
}

.audio-hint {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-left: 2.75rem;
}

/* Button Group */
.button-group {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-family: inherit;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    transform: translate(-50%, -50%);
    transition: width var(--transition-slow), height var(--transition-slow);
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-icon {
    width: 1.25rem;
    height: 1.25rem;
    position: relative;
    z-index: 1;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

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

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

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

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

.btn:disabled::before {
    display: none;
}

.btn-download {
    background: var(--success);
    color: white;
    box-shadow: 0 4px 12px var(--success-glow);
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--success-glow);
}

/* Recording Info */
.recording-info {
    display: none;
    padding: var(--spacing-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    margin-top: var(--spacing-lg);
}

.recording-info.active {
    display: block;
    animation: slideDown var(--transition-normal);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

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

.recording-timer {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 1.125rem;
}

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

.timer-value {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--danger);
    font-variant-numeric: tabular-nums;
}

/* Preview Section */
.preview-section {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
}

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

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

.video-container {
    position: relative;
    width: 100%;
    min-height: 400px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

#previewVideo {
    width: 100%;
    height: 100%;
    display: none;
    border-radius: var(--radius-lg);
}

#previewVideo.active {
    display: block;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 400px;
    gap: var(--spacing-md);
}

.empty-state.hidden {
    display: none;
}

.empty-icon {
    width: 4rem;
    height: 4rem;
    color: var(--text-tertiary);
    opacity: 0.5;
}

.empty-state p {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.empty-state span {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

/* Footer */
.footer {
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-xl);
    text-align: center;
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.shortcuts-info {
    margin-bottom: var(--spacing-lg);
}

.shortcuts-info h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

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

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

kbd {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    font-family: 'Inter', monospace;
    font-weight: 600;
    color: var(--text-primary);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2), inset 0 -2px 0 rgba(0, 0, 0, 0.2);
    transition: all var(--transition-fast);
}

kbd:hover {
    background: var(--bg-secondary);
    transform: translateY(-1px);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.3), inset 0 -2px 0 rgba(0, 0, 0, 0.2);
}

.footer-text {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    margin: 0;
}

/* Notification */
.notification {
    position: fixed;
    top: var(--spacing-xl);
    right: var(--spacing-xl);
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    transform: translateX(400px);
    transition: transform var(--transition-normal);
    z-index: 1000;
    max-width: 350px;
}

.notification.show {
    transform: translateX(0);
}

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

.notification-icon {
    width: 1.5rem;
    height: 1.5rem;
    color: var(--accent-primary);
    flex-shrink: 0;
}

.notification.error .notification-icon {
    color: var(--danger);
}

.notification.success .notification-icon {
    color: var(--success);
}

.notification-message {
    font-size: 0.875rem;
    color: var(--text-primary);
}

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

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

    .logo h1 {
        font-size: 1.5rem;
    }

    .button-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .video-container {
        min-height: 250px;
    }

    .empty-state {
        height: 250px;
    }

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

    .shortcuts-grid {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .shortcut-item {
        justify-content: center;
    }
}

/* Animations */
@keyframes recording-pulse {

    0%,
    100% {
        box-shadow: 0 0 0 0 var(--danger-glow);
    }

    50% {
        box-shadow: 0 0 0 10px rgba(239, 68, 68, 0);
    }
}

.recording .recorder-card {
    animation: recording-pulse 2s ease-in-out infinite;
}