/* === Fingerpaint Styles === */
:root {
    --bg: #0a0a0f;
    --surface: rgba(15, 15, 25, 0.85);
    --surface-solid: #14141f;
    --border: rgba(42, 42, 62, 0.5);
    --text: #e8e8f0;
    --text-muted: #8888a0;
    --accent: #2e7d32;
    --accent-hover: #43a047;
    --accent-glow: rgba(46, 125, 50, 0.3);
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: #000;
    color: var(--text);
    -webkit-user-select: none;
    user-select: none;
    touch-action: none;
}

/* === Startup Overlay === */
.startup-overlay {
    position: fixed;
    inset: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.startup-overlay.hiding {
    opacity: 0;
    visibility: hidden;
}

.startup-content {
    text-align: center;
    max-width: 700px;
    padding: 2rem;
    width: 100%;
}

.startup-icon {
    color: var(--accent);
    margin-bottom: 0.25rem;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.startup-content h1 {
    font-size: 2.2rem;
    font-weight: 700;
    margin-top: 0;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #2e7d32, #43a047, #1b5e20);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.startup-content > p {
    color: var(--text-muted);
    margin-bottom: 2rem;
    font-size: 0.95rem;
}

.startup-camera-select {
    margin-bottom: 1.5rem;
}

.startup-camera-select label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.startup-camera-select select {
    width: 100%;
    padding: 0.6rem 1rem;
    background: var(--surface-solid);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-family: inherit;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238888a0' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
}

.start-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 2.5rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
}

.start-btn:hover:not(:disabled) {
    background: var(--accent-hover);
    box-shadow: 0 0 24px var(--accent-glow);
    transform: translateY(-1px);
}

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

.start-btn-loader {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* === App Layout === */
.app {
    width: 100%;
    height: 100%;
    position: relative;
}

.app.hidden {
    display: none;
}

/* === Fullscreen Camera Background === */
.camera-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    background: #000;
    overflow: hidden;
}

.camera-bg video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scaleX(-1);
    transition: opacity 0.3s;
}

.camera-bg video.no-mirror {
    transform: scaleX(1);
}

.camera-bg canvas#overlay-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform: scaleX(-1);
    pointer-events: none;
    z-index: 2;
}

.camera-bg canvas#overlay-canvas.no-mirror {
    transform: scaleX(1);
}

/* === Drawing Canvas (fullscreen, over camera) === */
#draw-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 3;
    pointer-events: none;
}

/* === Gesture Cursor === */
.gesture-cursor {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    pointer-events: none;
    will-change: transform;
}

.gesture-cursor.hidden {
    opacity: 0;
}

.cursor-ring {
    width: 30px;
    height: 30px;
    border: 2px solid rgba(255,255,255,0.5);
    border-radius: 50%;
    position: absolute;
    top: 0;
    left: 0;
    transform: translate(-50%, -50%);
    transition: border-color 0.15s;
}

.cursor-dot {
    width: 4px;
    height: 4px;
    background: white;
    border-radius: 50%;
    position: absolute;
    top: -2px;
    left: -2px;
}

.gesture-cursor.drawing .cursor-ring {
    border-color: var(--accent);
    border-width: 2px;
    box-shadow: 0 0 8px var(--accent-glow), 0 0 16px var(--accent-glow);
}

.gesture-cursor.drawing .cursor-dot {
    background: var(--accent);
    box-shadow: 0 0 6px var(--accent);
}

.gesture-cursor.erasing .cursor-ring {
    border-color: var(--warning);
    border-style: dashed;
}

.gesture-cursor.erasing .cursor-dot {
    background: var(--warning);
}

.gesture-cursor.picking .cursor-ring {
    border-color: var(--success);
    border-width: 3px;
    animation: pulse 0.8s ease-in-out infinite;
}

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

/* === Bottom Toolbar === */
.toolbar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 8px 12px;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--border);
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 3px;
}

.toolbar-divider {
    width: 1px;
    height: 28px;
    background: var(--border);
    margin: 0 6px;
}

.toolbar-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 6px 10px;
    background: rgba(255,255,255,0.06);
    color: var(--text-muted);
    border: none;
    border-radius: 6px;
    font-size: 0.72rem;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.toolbar-btn:hover {
    background: rgba(255,255,255,0.12);
    color: var(--text);
}

.toolbar-btn.active {
    background: var(--accent);
    color: white;
}

.toolbar-btn.active:hover {
    background: var(--accent-hover);
}

.toolbar-btn.locked {
    box-shadow: 0 0 0 2px white, 0 0 12px var(--accent-glow);
}

.toolbar-btn svg {
    flex-shrink: 0;
}

.toolbar-btn kbd {
    font-size: 0.58rem;
    background: rgba(255,255,255,0.15);
    padding: 1px 4px;
    border-radius: 3px;
    font-family: inherit;
    opacity: 0.7;
}

/* Color picker in toolbar */
.toolbar-color {
    display: flex;
    align-items: center;
    gap: 5px;
}

.color-preview-wrap {
    position: relative;
    width: 28px;
    height: 28px;
    cursor: pointer;
}

#color-preview {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.3);
    transition: border-color var(--transition);
}

.color-preview-wrap:hover #color-preview {
    border-color: rgba(255,255,255,0.6);
}

#color-input {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
    width: 100%;
    height: 100%;
}

/* Color presets row */
.color-presets {
    display: flex;
    gap: 3px;
}

.color-preset {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 1.5px solid rgba(255,255,255,0.15);
    cursor: pointer;
    transition: transform 0.1s, border-color 0.1s;
}

.color-preset:hover {
    transform: scale(1.2);
    border-color: rgba(255,255,255,0.5);
}

/* Brush size in toolbar */
.toolbar-size {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.7rem;
    color: var(--text-muted);
}

.toolbar-size input[type="range"] {
    width: 70px;
    height: 3px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--border);
    border-radius: 2px;
    outline: none;
}

.toolbar-size input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
}

#brush-size-val {
    min-width: 18px;
    text-align: center;
    font-variant-numeric: tabular-nums;
}

/* === Status Display === */
.status-display {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 200;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: rgba(10, 10, 15, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 20px;
    border: 1px solid var(--border);
    font-size: 0.75rem;
    color: var(--text-muted);
}

#status-gesture {
    color: var(--text);
    font-weight: 500;
}

/* === FPS Counter === */
#fps-counter {
    position: fixed;
    top: 12px;
    right: 12px;
    z-index: 200;
    padding: 4px 10px;
    background: rgba(10, 10, 15, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 12px;
    border: 1px solid var(--border);
    font-size: 0.7rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
    display: none;
}

/* === Settings Panel === */
.settings-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 320px;
    max-height: 100vh;
    background: rgba(10, 10, 15, 0.92);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-left: 1px solid var(--border);
    z-index: 500;
    overflow-y: auto;
    box-shadow: -8px 0 32px rgba(0,0,0,0.4);
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.settings-panel.hidden {
    transform: translateX(100%);
    opacity: 0;
    pointer-events: none;
}

.settings-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    background: rgba(10, 10, 15, 0.95);
    z-index: 1;
}

.settings-header h3 {
    font-size: 0.95rem;
    font-weight: 600;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.3rem;
    cursor: pointer;
    padding: 0.25rem;
    line-height: 1;
}

.close-btn:hover {
    color: var(--text);
}

.settings-body {
    padding: 1rem 1.25rem;
    padding-bottom: 80px; /* space for toolbar */
}

.settings-section-title {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    margin-bottom: 0.75rem;
    margin-top: 0.5rem;
    padding-bottom: 0.35rem;
    border-bottom: 1px solid var(--border);
}

.setting-group {
    margin-bottom: 1rem;
}

.setting-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.setting-group input[type="range"] {
    width: 100%;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--border);
    border-radius: 2px;
    outline: none;
}

.setting-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
}

.setting-group input[type="checkbox"] {
    accent-color: var(--accent);
    width: 16px;
    height: 16px;
}

.setting-group select {
    width: 100%;
    padding: 0.5rem;
    background: rgba(255,255,255,0.06);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-family: inherit;
    font-size: 0.82rem;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238888a0' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.5rem center;
}

.setting-val {
    font-size: 0.78rem;
    color: var(--accent);
    font-weight: 600;
    margin-left: auto;
}

.setting-hint {
    font-size: 0.68rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
    opacity: 0.7;
}

.settings-btn-group {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.settings-action-btn {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    flex: 1;
    min-width: 80px;
    padding: 0.5rem 0.6rem;
    background: rgba(255,255,255,0.06);
    color: var(--text-muted);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.75rem;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
    justify-content: center;
}

.settings-action-btn:hover {
    background: rgba(255,255,255,0.12);
    color: var(--text);
}

.settings-action-btn.danger {
    border-color: rgba(239, 68, 68, 0.3);
    color: var(--danger);
}

.settings-action-btn.danger:hover {
    background: rgba(239, 68, 68, 0.15);
}

/* === Toast === */
.toast {
    position: fixed;
    bottom: 70px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--text);
    padding: 0.6rem 1.2rem;
    border-radius: 20px;
    border: 1px solid var(--border);
    font-size: 0.82rem;
    z-index: 9999;
    box-shadow: 0 8px 32px rgba(0,0,0,0.4);
    transition: all 0.3s ease;
    opacity: 0;
    pointer-events: none;
}

.toast.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* === Shortcuts Help === */
.shortcuts-hint {
    position: fixed;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 150;
    display: flex;
    gap: 12px;
    padding: 5px 14px;
    background: rgba(10, 10, 15, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 16px;
    border: 1px solid var(--border);
    font-size: 0.68rem;
    color: var(--text-muted);
}

.shortcuts-hint span {
    display: flex;
    align-items: center;
    gap: 3px;
}

.shortcuts-hint kbd {
    background: rgba(255,255,255,0.1);
    padding: 1px 5px;
    border-radius: 3px;
    font-family: inherit;
    font-size: 0.65rem;
    color: var(--text);
}

/* === Legal Links === */
.startup-legal {
    margin-top: 1.5rem;
    display: flex;
    justify-content: center;
    gap: 16px;
    font-size: 0.75rem;
}

.startup-legal a {
    color: var(--text-muted);
    text-decoration: none;
    opacity: 0.6;
    transition: opacity 0.2s;
}

.startup-legal a:hover {
    opacity: 1;
    text-decoration: underline;
}

.settings-legal {
    margin-top: 1.5rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: center;
    gap: 16px;
    font-size: 0.75rem;
}

.settings-legal a {
    color: var(--text-muted);
    text-decoration: none;
    opacity: 0.6;
    transition: opacity 0.2s;
}

.settings-legal a:hover {
    opacity: 1;
    text-decoration: underline;
}

/* === Save Modal === */
.save-modal {
    max-width: 400px;
}

.save-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.save-option-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: inherit;
    cursor: pointer;
    text-align: left;
    transition: all var(--transition);
}

.save-option-btn:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--accent);
}

.save-option-btn svg {
    flex-shrink: 0;
    color: var(--text-muted);
}

.save-option-btn span {
    font-size: 0.88rem;
    font-weight: 500;
}

.save-option-btn small {
    display: block;
    font-size: 0.72rem;
    color: var(--text-muted);
    font-weight: 400;
    margin-top: 1px;
}

/* === Legal Modals === */
.legal-modal {
    position: fixed;
    inset: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.legal-modal.hidden {
    display: none;
}

.legal-modal-content {
    background: var(--surface-solid);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    max-width: 560px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
}

.legal-modal-content h2 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--accent);
}

.legal-modal-content h3 {
    font-size: 0.9rem;
    margin-top: 1rem;
    margin-bottom: 0.3rem;
    color: var(--text);
}

.legal-modal-content p {
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 0.5rem;
}

.legal-modal-content a {
    color: var(--accent);
    text-decoration: none;
}

.legal-modal-content a:hover {
    text-decoration: underline;
}

.legal-modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
}

.legal-modal-close:hover {
    color: var(--text);
}

/* === Scrollbar === */
::-webkit-scrollbar {
    width: 4px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 2px;
}

/* === Responsive === */
@media (max-width: 768px) {
    .toolbar {
        flex-wrap: wrap;
        gap: 3px;
        padding: 6px 8px;
    }

    .toolbar-btn {
        padding: 5px 7px;
        font-size: 0;
    }

    .toolbar-btn svg {
        width: 16px;
        height: 16px;
    }

    .toolbar-btn kbd {
        display: none;
    }

    .toolbar-size input[type="range"] {
        width: 50px;
    }

    .color-presets {
        display: none;
    }

    .shortcuts-hint {
        display: none;
    }

    .settings-panel {
        width: 100%;
    }

    .toast {
        bottom: 60px;
        font-size: 0.75rem;
    }
}