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

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --success-color: #10b981;
    --success-hover: #059669;
    --secondary-color: #6b7280;
    --secondary-hover: #4b5563;
    --bg-color: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #475569;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --recording-color: #ef4444;
    --gradient-start: #6366f1;
    --gradient-end: #8b5cf6;
}

html {
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, var(--bg-color) 0%, #1a1a2e 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* App Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

/* Header Styles */
.header {
    text-align: center;
    padding: 2rem 1rem;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo-icon {
    width: 2.5rem;
    height: 2.5rem;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding: 1rem;
}

/* Controls Section */
.controls-section {
    background: var(--bg-secondary);
    border-radius: 1rem;
    padding: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px var(--shadow-color);
}

.control-group {
    display: flex;
    justify-content: center;
    margin-bottom: 1.5rem;
}

/* Toggle Switch */
.toggle-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    user-select: none;
}

.toggle-input {
    display: none;
}

.toggle-slider {
    position: relative;
    width: 3rem;
    height: 1.5rem;
    background: var(--bg-tertiary);
    border-radius: 1rem;
    transition: background 0.3s ease;
}

.toggle-slider::before {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 1.25rem;
    height: 1.25rem;
    background: var(--text-primary);
    border-radius: 50%;
    transition: transform 0.3s ease;
}

.toggle-input:checked + .toggle-slider {
    background: var(--primary-color);
}

.toggle-input:checked + .toggle-slider::before {
    transform: translateX(1.5rem);
}

.toggle-text {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.toggle-text .icon {
    width: 1.25rem;
    height: 1.25rem;
}

/* Timer Display */
.timer-display {
    text-align: center;
    margin-bottom: 1.5rem;
}

.timer-value {
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    font-size: 3rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.1em;
}

.timer-display.recording .timer-value {
    color: var(--recording-color);
    animation: pulse 1s ease-in-out infinite;
}

.timer-display.paused .timer-value {
    color: var(--secondary-color);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

/* Button Group */
.button-group {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 0.75rem;
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 160px;
}

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

.btn-icon {
    width: 1.25rem;
    height: 1.25rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

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

.btn-danger:hover:not(:disabled) {
    background: var(--danger-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--secondary-hover);
    transform: translateY(-2px);
}

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

.btn-success:hover:not(:disabled) {
    background: var(--success-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

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

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

/* Pause/Resume Button */
.resume-icon.hidden,
.pause-icon.hidden {
    display: none;
}

/* Preview Section */
.preview-section {
    background: var(--bg-secondary);
    border-radius: 1rem;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px var(--shadow-color);
}

.preview-container {
    position: relative;
    background: var(--bg-color);
    border-radius: 0.75rem;
    overflow: hidden;
    aspect-ratio: 16 / 9;
    margin-bottom: 1rem;
}

.preview-video {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: none;
}

.preview-video.visible {
    display: block;
}

.preview-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    gap: 1rem;
}

.preview-overlay.hidden {
    display: none;
}

.preview-icon {
    width: 4rem;
    height: 4rem;
    opacity: 0.5;
}

.preview-overlay p {
    font-size: 1rem;
}

.preview-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Live Preview Section */
.live-preview-section {
    background: var(--bg-secondary);
    border-radius: 1rem;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px var(--shadow-color);
}

.live-preview-section.hidden {
    display: none;
}

.section-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.recording-indicator {
    width: 0.75rem;
    height: 0.75rem;
    background: var(--recording-color);
    border-radius: 50%;
    animation: blink 1s ease-in-out infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.live-video {
    width: 100%;
    border-radius: 0.75rem;
    background: var(--bg-color);
    aspect-ratio: 16 / 9;
    object-fit: contain;
}

/* Status Message */
.status-message {
    text-align: center;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    min-height: 2.5rem;
}

.status-message.info {
    background: rgba(99, 102, 241, 0.2);
    color: #a5b4fc;
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.status-message.success {
    background: rgba(16, 185, 129, 0.2);
    color: #6ee7b7;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-message.error {
    background: rgba(239, 68, 68, 0.2);
    color: #fca5a5;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.status-message:empty {
    display: none;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 1rem;
    margin-top: auto;
    border-top: 1px solid var(--border-color);
}

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

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.footer a:hover {
    color: var(--gradient-end);
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .logo h1 {
        font-size: 1.5rem;
    }

    .logo-icon {
        width: 2rem;
        height: 2rem;
    }

    .timer-value {
        font-size: 2rem;
    }

    .controls-section {
        padding: 1.5rem 1rem;
    }

    .btn {
        min-width: 140px;
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }

    .button-group {
        gap: 0.75rem;
    }

    .preview-container {
        aspect-ratio: 4 / 3;
    }
}

@media (max-width: 480px) {
    .app-container {
        padding: 0.5rem;
    }

    .header {
        padding: 1.5rem 0.5rem;
    }

    .logo h1 {
        font-size: 1.25rem;
    }

    .tagline {
        font-size: 0.875rem;
    }

    .timer-value {
        font-size: 1.75rem;
    }

    .btn {
        min-width: 100%;
        justify-content: center;
    }

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

    .preview-actions {
        flex-direction: column;
    }

    .preview-actions .btn {
        width: 100%;
    }

    .toggle-text {
        font-size: 0.85rem;
    }
}

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

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

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