/* ============================================================
   ATLAS — Design System & Styles
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

:root {
    /* Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: rgba(255, 255, 255, 0.04);
    --bg-card-hover: rgba(255, 255, 255, 0.08);
    --bg-glass: rgba(20, 20, 35, 0.75);
    --bg-modal: rgba(0, 0, 0, 0.7);
    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);
    --text-primary: #f0f0f5;
    --text-secondary: rgba(240, 240, 245, 0.55);
    --text-muted: rgba(240, 240, 245, 0.3);
    --accent-1: #a78bfa;
    --accent-2: #60a5fa;
    --accent-3: #34d399;
    --danger: #f87171;
    --gradient-primary: linear-gradient(135deg, var(--accent-1), var(--accent-2));
    --gradient-glow: linear-gradient(135deg, rgba(167, 139, 250, 0.15), rgba(96, 165, 250, 0.15));

    /* Typography */
    --font: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;

    /* Spacing */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    /* Transitions */
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html,
body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* ============================================================
   VIEWS
   ============================================================ */

.view {
    position: fixed;
    inset: 0;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s var(--ease), visibility 0.5s var(--ease);
}

.view.active {
    opacity: 1;
    visibility: visible;
}

/* ============================================================
   MAIN MENU
   ============================================================ */

.menu-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 20% 10%, rgba(167, 139, 250, 0.08) 0%, transparent 60%),
        radial-gradient(ellipse 60% 50% at 80% 80%, rgba(96, 165, 250, 0.06) 0%, transparent 60%),
        radial-gradient(ellipse 50% 40% at 50% 50%, rgba(52, 211, 153, 0.03) 0%, transparent 60%);
    z-index: 0;
    pointer-events: none;
}

#menu-view {
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
}

.menu-header {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 60px 24px 20px;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 12px;
}

.logo-icon {
    width: 56px;
    height: 56px;
    animation: logo-float 6s ease-in-out infinite;
}

@keyframes logo-float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-6px);
    }
}

.logo-text {
    font-size: 3.2rem;
    font-weight: 900;
    letter-spacing: -2px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
    letter-spacing: 0.5px;
}

.menu-content {
    position: relative;
    z-index: 1;
    max-width: 960px;
    width: 100%;
    margin: 0 auto;
    padding: 20px 24px 60px;
    flex: 1;
}

.menu-actions {
    display: flex;
    justify-content: center;
    margin-bottom: 48px;
}

/* Buttons */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s var(--ease);
    outline: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 4px 20px rgba(167, 139, 250, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(167, 139, 250, 0.35);
}

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

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-subtle);
}

.btn-ghost:hover {
    background: var(--bg-card);
    color: var(--text-primary);
    border-color: var(--border-hover);
}

/* Projects Section */

.section-title {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
    margin-bottom: 48px;
}

.project-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 24px;
    cursor: pointer;
    transition: all 0.35s var(--ease);
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-glow);
    opacity: 0;
    transition: opacity 0.35s var(--ease);
    pointer-events: none;
}

.project-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.project-card:hover::before {
    opacity: 1;
}

.project-card-name {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 6px;
    position: relative;
    z-index: 1;
}

.project-card-meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
    position: relative;
    z-index: 1;
}

.project-card-strokes {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 12px;
    position: relative;
    z-index: 1;
}

.project-card-delete {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 50%;
    background: rgba(248, 113, 113, 0.1);
    color: var(--danger);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all 0.25s var(--ease);
    z-index: 2;
}

.project-card:hover .project-card-delete {
    opacity: 1;
}

.project-card-delete:hover {
    background: rgba(248, 113, 113, 0.25);
    transform: scale(1.1);
}

/* Empty State */

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
    display: none;
}

.empty-state.visible {
    display: block;
}

.empty-icon {
    margin-bottom: 16px;
}

.empty-state p {
    font-size: 0.95rem;
}

/* Gestures Guide */

.gestures-guide {
    margin-top: 16px;
}

.gestures-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
}

.gesture-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 20px;
    text-align: center;
    transition: all 0.3s var(--ease);
}

.gesture-card:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
}

.gesture-icon {
    font-size: 2rem;
    margin-bottom: 8px;
}

.gesture-card h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.gesture-card p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* ============================================================
   CANVAS VIEW
   ============================================================ */

#canvas-view {
    background: #000;
}

#camera-feed {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scaleX(-1);
    opacity: 0.25;
    z-index: 0;
}

#drawing-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    cursor: none;
}

#ui-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    pointer-events: none;
}

/* Toolbar */

.toolbar {
    position: fixed;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    background: var(--bg-glass);
    backdrop-filter: blur(24px) saturate(1.4);
    -webkit-backdrop-filter: blur(24px) saturate(1.4);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    z-index: 10;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
    animation: toolbar-in 0.5s var(--spring) both;
    animation-delay: 0.2s;
}

@keyframes toolbar-in {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

.toolbar-btn {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.25s var(--ease);
}

.toolbar-btn:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.toolbar-divider {
    width: 1px;
    height: 24px;
    background: var(--border-subtle);
}

.color-picker-wrap {
    position: relative;
    width: 36px;
    height: 36px;
}

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

.color-preview {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--accent-1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    pointer-events: none;
    transition: all 0.25s var(--ease);
    box-shadow: 0 2px 10px rgba(167, 139, 250, 0.3);
}

.brush-size-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
}

#brush-size {
    width: 80px;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--border-subtle);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

#brush-size::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-1);
    border: 2px solid rgba(255, 255, 255, 0.3);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(167, 139, 250, 0.4);
}

.size-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    min-width: 20px;
    text-align: center;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

/* Gesture Indicator */

.gesture-indicator {
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    z-index: 10;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.3s var(--ease);
}

.gesture-ind-icon {
    font-size: 1.2rem;
}

.gesture-ind-label {
    color: var(--text-secondary);
}

.gesture-indicator[data-mode="draw"] {
    border-color: rgba(167, 139, 250, 0.3);
}

.gesture-indicator[data-mode="draw"] .gesture-ind-label {
    color: var(--accent-1);
}

.gesture-indicator[data-mode="move"] {
    border-color: rgba(96, 165, 250, 0.3);
}

.gesture-indicator[data-mode="move"] .gesture-ind-label {
    color: var(--accent-2);
}

.gesture-indicator[data-mode="erase"] {
    border-color: rgba(248, 113, 113, 0.3);
}

.gesture-indicator[data-mode="erase"] .gesture-ind-label {
    color: var(--danger);
}

.gesture-indicator[data-mode="zoom"] {
    border-color: rgba(52, 211, 153, 0.3);
}

.gesture-indicator[data-mode="zoom"] .gesture-ind-label {
    color: var(--accent-3);
}

/* Project Title Bar */

.project-title-bar {
    position: fixed;
    top: 20px;
    left: 20px;
    padding: 8px 16px;
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    z-index: 10;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.3px;
}

/* ============================================================
   MODAL
   ============================================================ */

.modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-modal);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s var(--ease);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 32px;
    width: 90%;
    max-width: 420px;
    transform: scale(0.92) translateY(10px);
    transition: transform 0.4s var(--spring);
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

.modal h2 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.modal input[type="text"] {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.25s var(--ease);
}

.modal input[type="text"]:focus {
    border-color: var(--accent-1);
}

.modal input[type="text"]::placeholder {
    color: var(--text-muted);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 24px;
}

/* ============================================================
   SCROLLBAR
   ============================================================ */

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 640px) {
    .logo-text {
        font-size: 2.4rem;
    }

    .menu-header {
        padding: 40px 16px 16px;
    }

    .menu-content {
        padding: 16px 16px 40px;
    }

    .toolbar {
        bottom: 16px;
        gap: 6px;
        padding: 8px 12px;
    }

    .gestures-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}