/* ========== CSS VARIABLES & RESET ========== */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: rgba(20, 20, 35, 0.85);
    --bg-glass: rgba(255, 255, 255, 0.04);
    --border-glass: rgba(255, 255, 255, 0.08);
    --text-primary: #e8e6f0;
    --text-secondary: #8b8a97;
    --text-muted: #5a5968;
    --accent-1: #f72585;
    --accent-2: #7209b7;
    --accent-3: #3a0ca3;
    --accent-4: #4361ee;
    --accent-5: #4cc9f0;
    --gradient-main: linear-gradient(135deg, #f72585, #7209b7, #4361ee);
    --gradient-neon: linear-gradient(135deg, #00ff87, #60efff);
    --gradient-warm: linear-gradient(135deg, #f72585, #ff6b6b);
    --shadow-neon: 0 0 30px rgba(247, 37, 133, 0.3), 0 0 60px rgba(114, 9, 183, 0.15);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --font-main: 'Be Vietnam Pro', sans-serif;
    --font-mono: 'Space Mono', monospace;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
    font-family: var(--font-main);
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(247, 37, 133, 0.08) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(67, 97, 238, 0.08) 0%, transparent 60%),
        radial-gradient(ellipse at 50% 80%, rgba(114, 9, 183, 0.06) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}
.hidden { display: none !important; }
button { cursor: pointer; border: none; background: none; font-family: inherit; color: inherit; }
img { max-width: 100%; display: block; }

/* ========== LOADING SCREEN ========== */
.loading-screen {
    position: fixed; inset: 0; z-index: 9999;
    display: flex; align-items: center; justify-content: center;
    background: var(--bg-primary);
}
.loading-content { text-align: center; }
.loading-hand {
    font-size: 4rem;
    animation: wave 1.5s ease-in-out infinite;
}
@keyframes wave {
    0%, 100% { transform: rotate(0deg); }
    25% { transform: rotate(20deg); }
    75% { transform: rotate(-15deg); }
}
.loading-title {
    font-size: 2.5rem; font-weight: 900;
    background: var(--gradient-main); -webkit-background-clip: text;
    -webkit-text-fill-color: transparent; background-clip: text;
    margin: 1rem 0 0.5rem;
}
.loading-subtitle { color: var(--text-secondary); font-size: 1rem; margin-bottom: 2rem; }
.loading-bar {
    width: 280px; height: 4px; border-radius: 4px;
    background: var(--bg-glass); margin: 0 auto 1rem; overflow: hidden;
}
.loading-bar-fill {
    height: 100%; width: 0%; border-radius: 4px;
    background: var(--gradient-main); transition: width 0.5s ease;
}
.loading-status { color: var(--text-muted); font-size: 0.85rem; font-family: var(--font-mono); }

/* ========== APP LAYOUT ========== */
.app { display: flex; flex-direction: column; height: 100vh; position: relative; z-index: 1; }

/* ========== HEADER ========== */
.header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 0.75rem 1.5rem;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-glass);
    backdrop-filter: blur(20px);
    z-index: 100;
}
.header-left, .header-right { display: flex; align-items: center; gap: 0.75rem; }
.logo { display: flex; align-items: center; gap: 0.5rem; }
.logo-icon { font-size: 1.5rem; }
.logo-text { font-size: 1.25rem; font-weight: 800; letter-spacing: -0.5px; }
.logo-accent {
    background: var(--gradient-main); -webkit-background-clip: text;
    -webkit-text-fill-color: transparent; background-clip: text;
}
.mode-switcher {
    display: flex; gap: 0.25rem; padding: 4px;
    background: var(--bg-glass); border-radius: var(--radius-md);
    border: 1px solid var(--border-glass);
}
.mode-btn {
    display: flex; align-items: center; gap: 0.4rem;
    padding: 0.5rem 1rem; border-radius: var(--radius-sm);
    font-size: 0.85rem; font-weight: 500;
    color: var(--text-secondary); transition: var(--transition);
}
.mode-btn.active {
    background: var(--gradient-main); color: white;
    box-shadow: 0 2px 12px rgba(247, 37, 133, 0.3);
}
.mode-btn:hover:not(.active) { background: rgba(255,255,255,0.06); color: var(--text-primary); }
.mode-icon { font-size: 1rem; }
.icon-btn {
    position: relative;
    width: 40px; height: 40px; border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem; transition: var(--transition);
    background: var(--bg-glass); border: 1px solid var(--border-glass);
}
.icon-btn:hover { background: rgba(255,255,255,0.08); transform: translateY(-1px); }
.gallery-count {
    position: absolute; top: -4px; right: -4px;
    background: var(--accent-1); color: white;
    font-size: 0.65rem; font-weight: 700;
    min-width: 18px; height: 18px; line-height: 18px;
    text-align: center; border-radius: 99px;
    border: 2px solid var(--bg-primary);
}

/* ========== MAIN CONTENT ========== */
.main-content {
    flex: 1; display: flex; overflow: hidden;
    padding: 1rem; gap: 1rem;
}

/* ========== CAMERA SECTION ========== */
.camera-section { flex: 1; display: flex; flex-direction: column; gap: 0.75rem; min-width: 0; }
.camera-container {
    flex: 1; position: relative; border-radius: var(--radius-lg);
    overflow: hidden; background: #000;
    border: 2px solid var(--border-glass);
    box-shadow: var(--shadow-card);
}
.camera-container video {
    width: 100%; height: 100%; object-fit: cover;
    transform: scaleX(-1);
}
.canvas-overlay {
    position: absolute; inset: 0;
    width: 100%; height: 100%;
    pointer-events: none;
}

/* Countdown */
.countdown-overlay {
    position: absolute; inset: 0; z-index: 20;
    display: flex; align-items: center; justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}
.countdown-number {
    font-size: 8rem; font-weight: 900;
    background: var(--gradient-main); -webkit-background-clip: text;
    -webkit-text-fill-color: transparent; background-clip: text;
    animation: countPulse 1s ease-in-out;
    text-shadow: none;
}
@keyframes countPulse {
    0% { transform: scale(0.3); opacity: 0; }
    50% { transform: scale(1.2); opacity: 1; }
    100% { transform: scale(1); opacity: 1; }
}

/* Flash */
.flash-overlay {
    position: absolute; inset: 0; z-index: 25;
    background: white; opacity: 0;
    animation: flashAnim 0.5s ease-out forwards;
}
@keyframes flashAnim {
    0% { opacity: 0.9; }
    100% { opacity: 0; }
}

/* Gesture Indicator */
.gesture-indicator {
    position: absolute; top: 1rem; left: 50%; transform: translateX(-50%);
    z-index: 15; display: flex; align-items: center; gap: 0.5rem;
    padding: 0.6rem 1.2rem; border-radius: var(--radius-xl);
    background: rgba(0, 0, 0, 0.7); backdrop-filter: blur(10px);
    border: 1px solid rgba(247, 37, 133, 0.4);
    animation: slideDown 0.3s ease;
}
@keyframes slideDown {
    from { transform: translateX(-50%) translateY(-20px); opacity: 0; }
    to { transform: translateX(-50%) translateY(0); opacity: 1; }
}
.gesture-emoji { font-size: 1.5rem; }
.gesture-label { font-size: 0.85rem; font-weight: 600; color: var(--accent-5); }

/* Tracking Status */
.tracking-status {
    position: absolute; bottom: 1rem; left: 1rem;
    display: flex; align-items: center; gap: 0.5rem;
    padding: 0.4rem 0.8rem; border-radius: var(--radius-xl);
    background: rgba(0,0,0,0.6); backdrop-filter: blur(8px);
    font-size: 0.75rem; color: var(--text-secondary);
    z-index: 10;
}
.tracking-dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--accent-1);
    animation: blink 1.5s ease-in-out infinite;
}
.tracking-status.detected .tracking-dot {
    background: #00ff87; animation: none;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0.3; } }

/* Filter Display */
.filter-display {
    position: absolute; top: 1rem; right: 1rem;
    padding: 0.4rem 1rem; border-radius: var(--radius-xl);
    background: rgba(0,0,0,0.6); backdrop-filter: blur(8px);
    font-size: 0.8rem; font-weight: 600; color: var(--accent-5);
    z-index: 10; border: 1px solid rgba(76, 201, 240, 0.3);
}

/* Strip Progress */
.strip-progress {
    position: absolute; bottom: 1rem; right: 1rem;
    display: flex; align-items: center; gap: 0.75rem;
    padding: 0.5rem 1rem; border-radius: var(--radius-xl);
    background: rgba(0,0,0,0.7); backdrop-filter: blur(8px);
    z-index: 10;
}
.strip-dots { display: flex; gap: 6px; }
.strip-dot {
    width: 10px; height: 10px; border-radius: 50%;
    background: rgba(255,255,255,0.2); transition: var(--transition);
}
.strip-dot.done { background: var(--accent-1); box-shadow: 0 0 8px rgba(247,37,133,0.5); }
.strip-dot.current { background: var(--accent-5); animation: blink 0.8s ease-in-out infinite; }
.strip-text { font-size: 0.75rem; font-weight: 600; color: var(--text-secondary); }

/* Gesture Guide */
.gesture-guide {
    display: flex; justify-content: center; gap: 0.5rem; flex-wrap: wrap;
    padding: 0.6rem 1rem; border-radius: var(--radius-md);
    background: var(--bg-card); border: 1px solid var(--border-glass);
    backdrop-filter: blur(10px);
}
.guide-item {
    display: flex; align-items: center; gap: 0.3rem;
    padding: 0.3rem 0.6rem; border-radius: var(--radius-sm);
    transition: var(--transition);
}
.guide-item:hover { background: var(--bg-glass); }
.guide-emoji { font-size: 1.1rem; }
.guide-text { font-size: 0.75rem; font-weight: 500; color: var(--text-secondary); }

/* ========== SIDE PANEL ========== */
.side-panel {
    width: 280px; display: flex; flex-direction: column; gap: 0.75rem;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-2) transparent;
}
.panel-section {
    padding: 1rem; border-radius: var(--radius-md);
    background: var(--bg-card); border: 1px solid var(--border-glass);
    backdrop-filter: blur(10px);
}
.panel-title {
    font-size: 0.85rem; font-weight: 700; margin-bottom: 0.75rem;
    display: flex; align-items: center; gap: 0.4rem;
}

/* Filter Grid */
.filter-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.5rem; }
.filter-btn {
    display: flex; flex-direction: column; align-items: center; gap: 0.3rem;
    padding: 0.5rem; border-radius: var(--radius-sm);
    transition: var(--transition);
    border: 2px solid transparent;
}
.filter-btn:hover { background: var(--bg-glass); transform: translateY(-2px); }
.filter-btn.active { border-color: var(--accent-1); background: rgba(247, 37, 133, 0.1); }
.filter-preview {
    width: 100%; height: 32px; border-radius: 6px;
}
.filter-btn span { font-size: 0.7rem; font-weight: 500; color: var(--text-secondary); }
.filter-btn.active span { color: var(--accent-1); }

/* Frame Grid */
.frame-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.5rem; }
.frame-btn {
    padding: 0.5rem; border-radius: var(--radius-sm);
    font-size: 0.75rem; font-weight: 500; text-align: center;
    background: var(--bg-glass); border: 2px solid transparent;
    transition: var(--transition); color: var(--text-secondary);
}
.frame-btn:hover { background: rgba(255,255,255,0.06); }
.frame-btn.active { border-color: var(--accent-4); background: rgba(67, 97, 238, 0.1); color: var(--accent-4); }

/* Recent Photos */
.recent-photos { display: flex; flex-direction: column; gap: 0.5rem; }
.empty-photos {
    text-align: center; padding: 1.5rem 0.5rem;
    color: var(--text-muted);
}
.empty-photos span { font-size: 2rem; display: block; margin-bottom: 0.5rem; }
.empty-photos p { font-size: 0.8rem; }
.recent-photo-item {
    position: relative; border-radius: var(--radius-sm); overflow: hidden;
    cursor: pointer; transition: var(--transition);
    border: 1px solid var(--border-glass);
}
.recent-photo-item:hover { transform: scale(1.02); border-color: var(--accent-1); }
.recent-photo-item img { width: 100%; height: 80px; object-fit: cover; }
.recent-photo-time {
    position: absolute; bottom: 4px; right: 6px;
    font-size: 0.6rem; padding: 2px 6px; border-radius: 4px;
    background: rgba(0,0,0,0.7); color: var(--text-secondary);
}

/* ========== MODALS ========== */
.modal {
    position: fixed; inset: 0; z-index: 1000;
    display: flex; align-items: center; justify-content: center;
    padding: 1rem;
}
.modal-backdrop {
    position: absolute; inset: 0;
    background: rgba(0, 0, 0, 0.7); backdrop-filter: blur(8px);
}
.modal-content {
    position: relative; z-index: 1;
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-neon);
    max-height: 90vh; overflow-y: auto;
    animation: modalIn 0.3s ease;
}
@keyframes modalIn {
    from { transform: scale(0.9) translateY(20px); opacity: 0; }
    to { transform: scale(1) translateY(0); opacity: 1; }
}
.close-btn {
    width: 36px; height: 36px; border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    background: var(--bg-glass); border: 1px solid var(--border-glass);
    font-size: 1.1rem; transition: var(--transition);
}
.close-btn:hover { background: rgba(247, 37, 133, 0.2); color: var(--accent-1); }

/* Preview Modal */
.preview-modal-content { width: min(600px, 90vw); }
.preview-header, .gallery-header, .help-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-glass);
}
.preview-header h2, .gallery-header h2, .help-header h2 {
    font-size: 1.1rem; font-weight: 700;
}
.preview-body { padding: 1.5rem; }
.preview-body img { width: 100%; border-radius: var(--radius-md); }
.preview-actions {
    display: flex; gap: 0.5rem; padding: 0 1.5rem 1rem;
    flex-wrap: wrap;
}
.preview-hint {
    text-align: center; padding: 0 1.5rem 1.25rem;
    font-size: 0.8rem; color: var(--text-muted);
}

/* Action Buttons */
.action-btn {
    display: inline-flex; align-items: center; gap: 0.4rem;
    padding: 0.6rem 1.2rem; border-radius: var(--radius-sm);
    font-size: 0.85rem; font-weight: 600;
    transition: var(--transition);
}
.action-btn.primary {
    background: var(--gradient-main); color: white;
    box-shadow: 0 2px 12px rgba(247, 37, 133, 0.3);
}
.action-btn.primary:hover { transform: translateY(-1px); box-shadow: 0 4px 20px rgba(247, 37, 133, 0.4); }
.action-btn.secondary {
    background: var(--bg-glass); border: 1px solid var(--border-glass); color: var(--text-primary);
}
.action-btn.secondary:hover { background: rgba(255,255,255,0.08); }
.action-btn.danger {
    background: rgba(255, 59, 48, 0.15); color: #ff6b6b;
    border: 1px solid rgba(255, 59, 48, 0.3);
}
.action-btn.danger:hover { background: rgba(255, 59, 48, 0.25); }
.action-btn.small { padding: 0.4rem 0.8rem; font-size: 0.75rem; }

/* Gallery Modal */
.gallery-modal-content { width: min(900px, 95vw); max-height: 85vh; }
.gallery-header-actions { display: flex; align-items: center; gap: 0.5rem; }
.gallery-body { padding: 1.5rem; overflow-y: auto; max-height: 70vh; }
.gallery-empty {
    text-align: center; padding: 3rem 1rem;
    color: var(--text-muted);
}
.gallery-empty-icon { font-size: 3rem; display: block; margin-bottom: 1rem; }
.gallery-empty-hint { font-size: 0.85rem; margin-top: 0.5rem; }
.gallery-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}
.gallery-item {
    position: relative; border-radius: var(--radius-md); overflow: hidden;
    cursor: pointer; transition: var(--transition);
    border: 1px solid var(--border-glass);
    group: true;
}
.gallery-item:hover { transform: translateY(-4px); border-color: var(--accent-1); box-shadow: var(--shadow-neon); }
.gallery-item img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.gallery-item-actions {
    position: absolute; inset: 0;
    display: flex; align-items: flex-end; justify-content: center;
    gap: 0.5rem; padding: 0.75rem;
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    opacity: 0; transition: var(--transition);
}
.gallery-item:hover .gallery-item-actions { opacity: 1; }
.gallery-item-btn {
    width: 36px; height: 36px; border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    background: rgba(0,0,0,0.6); backdrop-filter: blur(8px);
    border: 1px solid rgba(255,255,255,0.15);
    font-size: 1rem; transition: var(--transition);
}
.gallery-item-btn:hover { background: var(--accent-1); }

/* Help Modal */
.help-modal-content { width: min(600px, 90vw); }
.help-body { padding: 1.5rem; }
.help-section { margin-bottom: 1.5rem; }
.help-section h3 { font-size: 1rem; font-weight: 700; margin-bottom: 1rem; }
.help-gestures { display: flex; flex-direction: column; gap: 0.75rem; }
.help-gesture-item {
    display: flex; align-items: center; gap: 1rem;
    padding: 0.75rem; border-radius: var(--radius-sm);
    background: var(--bg-glass); border: 1px solid var(--border-glass);
}
.help-gesture-emoji { font-size: 2rem; flex-shrink: 0; }
.help-gesture-item strong { display: block; margin-bottom: 0.2rem; font-size: 0.9rem; }
.help-gesture-item p { font-size: 0.8rem; color: var(--text-secondary); }
.help-tips { padding-left: 1.2rem; }
.help-tips li {
    font-size: 0.85rem; color: var(--text-secondary);
    margin-bottom: 0.5rem; line-height: 1.5;
}

/* ========== CONFETTI ========== */
.confetti-container { position: fixed; inset: 0; pointer-events: none; z-index: 9000; overflow: hidden; }
.confetti-piece {
    position: absolute; top: -10px;
    width: 10px; height: 10px;
    animation: confettiFall 3s ease-in forwards;
}
@keyframes confettiFall {
    0% { transform: translateY(0) rotate(0deg) scale(1); opacity: 1; }
    100% { transform: translateY(100vh) rotate(720deg) scale(0.3); opacity: 0; }
}

/* ========== RESPONSIVE ========== */
@media (max-width: 900px) {
    .main-content { flex-direction: column; }
    .side-panel { width: 100%; flex-direction: row; overflow-x: auto; overflow-y: visible; }
    .panel-section { min-width: 250px; flex-shrink: 0; }
    .header-center { display: none; }
}
@media (max-width: 600px) {
    .header { padding: 0.5rem 0.75rem; }
    .main-content { padding: 0.5rem; gap: 0.5rem; }
    .gesture-guide { gap: 0.25rem; padding: 0.4rem 0.5rem; }
    .guide-text { display: none; }
    .gallery-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
}