/* ============================================================
   styles.css — Projectile Pixels Visual Design System
   ============================================================ */

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

/* ── CSS Custom Properties ─────────────────────────────── */
:root {
    --bg-deep: #070b16;
    --bg-dark: #0d1321;
    --bg-mid: #151d30;
    --bg-card: rgba(22, 32, 55, 0.85);
    --bg-glass: rgba(30, 44, 75, 0.55);
    --border-glass: rgba(100, 140, 220, 0.18);
    --border-glow: rgba(100, 180, 255, 0.3);

    --text-primary: #e8edf5;
    --text-secondary: #8b9cc0;
    --text-muted: #556080;

    --accent-cyan: #4ecdc4;
    --accent-pink: #ff6b9d;
    --accent-yellow: #ffd93d;
    --accent-purple: #a78bfa;
    --accent-red: #ff6b6b;
    --accent-green: #6bcb77;
    --accent-blue: #4ea8de;
    --accent-orange: #f4845f;

    --red-channel: #ff4444;
    --green-channel: #44dd44;
    --blue-channel: #4488ff;

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --shadow-glow: 0 0 30px rgba(78, 205, 196, 0.15);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-button: 0 4px 15px rgba(0, 0, 0, 0.3);

    --transition-fast: 150ms ease;
    --transition-med: 250ms ease;
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    --font-display: 'Orbitron', 'Inter', monospace;
}

/* ── Reset & Base ──────────────────────────────────────── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: var(--font-main);
    background: var(--bg-deep);
    color: var(--text-primary);
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    -webkit-user-select: none;
}

html, body {
    height: 100%;
    margin: 0;
}

body {
    background: linear-gradient(160deg, var(--bg-deep) 0%, #0a1628 40%, #0f1a30 100%);
}

/* ── App Container ─────────────────────────────────────── */
#app {
    width: 100%;
    min-height: 100vh;
    position: relative;
    display: flex;
    flex-direction: column;
}

/* ── Screens ───────────────────────────────────────────── */
.screen {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-slow);
    z-index: 10;
}
.screen.active {
    opacity: 1;
    pointer-events: all;
}

/* ── Main Menu ─────────────────────────────────────────── */
#menu-screen {
    background: radial-gradient(ellipse at 50% 30%, rgba(78, 205, 196, 0.08) 0%, transparent 60%),
                linear-gradient(160deg, var(--bg-deep) 0%, #0a1628 100%);
    gap: 20px;
    padding: 30px 20px;
}

.game-title {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 6vw, 3.5rem);
    font-weight: 900;
    text-align: center;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-pink), var(--accent-yellow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 30px rgba(78, 205, 196, 0.3));
    letter-spacing: 2px;
    animation: titlePulse 3s ease-in-out infinite;
}

@keyframes titlePulse {
    0%, 100% { filter: drop-shadow(0 0 20px rgba(78, 205, 196, 0.3)); }
    50% { filter: drop-shadow(0 0 40px rgba(78, 205, 196, 0.5)); }
}

.game-subtitle {
    font-size: clamp(0.85rem, 2.5vw, 1.1rem);
    color: var(--text-secondary);
    text-align: center;
    margin-top: -10px;
    letter-spacing: 3px;
    text-transform: uppercase;
}

.total-score-display {
    font-family: var(--font-display);
    font-size: clamp(0.75rem, 2vw, 0.9rem);
    color: var(--accent-yellow);
    letter-spacing: 1px;
    margin-top: 4px;
}

/* ── Path Cards ────────────────────────────────────────── */
.path-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px;
    width: 100%;
    max-width: 680px;
    padding: 0 10px;
    margin-top: 10px;
}

.path-card {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 22px 24px;
    cursor: pointer;
    transition: all var(--transition-med);
    position: relative;
    overflow: hidden;
}

.path-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 0%, var(--card-accent, var(--accent-cyan)) , transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-med);
}

.path-card:hover, .path-card:active {
    border-color: var(--card-accent, var(--accent-cyan));
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.3), 0 0 20px color-mix(in srgb, var(--card-accent, var(--accent-cyan)) 20%, transparent);
}
.path-card:hover::before, .path-card:active::before {
    opacity: 0.1;
}

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

.path-card-title {
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 4px;
    position: relative;
}

.path-card-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.4;
    position: relative;
}

.path-card-progress {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 8px;
    position: relative;
    font-weight: 600;
}

/* ── Level Select ──────────────────────────────────────── */
#level-screen {
    background: radial-gradient(ellipse at 50% 20%, rgba(78, 205, 196, 0.06) 0%, transparent 50%),
                linear-gradient(160deg, var(--bg-deep) 0%, #0a1628 100%);
    padding: 30px 20px;
    gap: 20px;
}

.level-header {
    text-align: center;
}

.level-path-name {
    font-family: var(--font-display);
    font-size: clamp(1.3rem, 4vw, 2rem);
    font-weight: 700;
    margin-bottom: 4px;
}

.level-back-btn {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    padding: 8px 20px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.85rem;
    font-family: var(--font-main);
    font-weight: 600;
    transition: all var(--transition-fast);
    margin-bottom: 10px;
}
.level-back-btn:hover {
    background: rgba(78, 205, 196, 0.15);
    border-color: var(--accent-cyan);
    color: var(--text-primary);
}

.level-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 12px;
    width: 100%;
    max-width: 600px;
    max-height: 50vh;
    overflow-y: auto;
    padding: 4px;
}

.level-card {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 16px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-med);
    position: relative;
}

.level-card.locked {
    opacity: 0.35;
    cursor: not-allowed;
    filter: grayscale(0.5);
}

.level-card:not(.locked):hover {
    border-color: var(--accent-cyan);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

.level-card-number {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--accent-cyan);
}

.level-card.locked .level-card-number {
    color: var(--text-muted);
}

.level-card-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.level-card-stars {
    margin-top: 6px;
    font-size: 0.9rem;
    letter-spacing: 2px;
}

.level-card-score {
    font-size: 0.65rem;
    color: var(--text-muted);
    margin-top: 2px;
}

.star-filled { color: var(--accent-yellow); }
.star-empty { color: var(--text-muted); opacity: 0.3; }

/* ── Stress Buster Config ──────────────────────────────── */
#stress-screen {
    background: radial-gradient(ellipse at 50% 30%, rgba(167, 139, 250, 0.08) 0%, transparent 50%),
                linear-gradient(160deg, var(--bg-deep) 0%, #0a1628 100%);
    padding: 30px 20px;
    gap: 20px;
}

.stress-config-panel {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-xl);
    padding: 30px;
    width: 100%;
    max-width: 420px;
}

.stress-config-title {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 24px;
    text-align: center;
    color: var(--accent-purple);
}

.config-group {
    margin-bottom: 20px;
}

.config-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 0.9rem;
    font-weight: 600;
}

.config-value {
    font-family: var(--font-display);
    font-size: 0.85rem;
    color: var(--accent-cyan);
}

/* ── Shared Slider Styles ──────────────────────────────── */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    border-radius: 4px;
    outline: none;
    cursor: pointer;
    background: var(--bg-mid);
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--text-primary);
    border: 3px solid var(--accent-cyan);
    box-shadow: 0 0 10px rgba(78, 205, 196, 0.4);
    cursor: pointer;
    transition: transform var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

input[type="range"]::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--text-primary);
    border: 3px solid var(--accent-cyan);
    box-shadow: 0 0 10px rgba(78, 205, 196, 0.4);
    cursor: pointer;
}

/* ── Game Screen ───────────────────────────────────────── */
#game-screen {
    z-index: 5;
    flex-direction: column;
    justify-content: stretch;
}

#game-screen.active {
    display: flex;
}

/* HUD */
.hud {
    display: grid;
    grid-template-columns: auto auto 1fr auto auto auto 1fr auto auto;
    align-items: center;
    gap: 16px;
    width: 100%;
    max-width: 100%;
    min-width: 0;
    box-sizing: border-box;
    padding: 10px 16px;
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-glass);
    z-index: 20;
    flex-shrink: 0;
    min-height: 46px;
}

.hud-primary, .hud-actions, .hud-details {
    display: contents;
}

/* Desktop order: score/hits, level/tolerance/pause, then session stats. */
.hud-details .hud-item:nth-child(1) { grid-column: 1; }
.hud-details .hud-item:nth-child(2) { grid-column: 2; }
.hud-primary .hud-item:nth-child(2) { grid-column: 4; }
.hud-details .hud-item:nth-child(4) { grid-column: 5; }
.hud-pause-btn { grid-column: 6; }
.hud-primary .hud-item:nth-child(1) { grid-column: 8; }
.hud-details .hud-item:nth-child(3) { grid-column: 9; }

.hud-details .hud-item {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 14px;
    padding: 8px 12px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.hud-item {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.hud-item span {
    color: var(--text-primary);
    font-family: var(--font-display);
    font-size: 0.85rem;
}

.hud-pause-btn {
    background: rgba(255,255,255,0.08);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.hud-pause-btn:hover {
    background: rgba(255,255,255,0.15);
}

.hud-expand-btn {
    display: none;
    background: rgba(255,255,255,0.08);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    width: 36px;
    height: 36px;
    padding: 0;
    border-radius: 50%;
    cursor: pointer;
    transition: background var(--transition-fast), border-color var(--transition-fast);
}

.hud-expand-btn:hover {
    background: rgba(255,255,255,0.15);
}

.hud-expand-btn svg {
    width: 18px;
    height: 18px;
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 2.25;
    transition: transform 220ms ease;
}

/* Canvas Area */
.canvas-container {
    flex: 1;
    position: relative;
    min-height: 0;
    overflow: hidden;
}

#gameCanvas {
    display: block;
    width: 100%;
    height: 100%;
    cursor: crosshair;
    touch-action: none;
}

/* ── Controls Dock ─────────────────────────────────────── */
.controls-dock {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    border-top: 1px solid var(--border-glass);
    flex-shrink: 0;
    z-index: 20;
}

.rgb-sliders {
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex: 1;
    min-width: 0;
}

.slider-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.slider-arrow {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(255, 255, 255, 0.06);
    color: rgba(255, 255, 255, 0.75);
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease;
    flex-shrink: 0;
}

.slider-arrow:hover,
.slider-arrow:focus {
    background: rgba(255, 255, 255, 0.14);
    transform: translateY(-1px);
}

.slider-label {
    font-family: var(--font-display);
    font-size: 0.7rem;
    font-weight: 700;
    width: 16px;
    text-align: center;
    flex-shrink: 0;
}

.slider-label.red { color: var(--red-channel); }
.slider-label.green { color: var(--green-channel); }
.slider-label.blue { color: var(--blue-channel); }

.slider-row input[type="range"] {
    flex: 1;
    height: 6px;
    min-width: 0;
}

.slider-row.red-slider input[type="range"] {
    background: linear-gradient(90deg, #1a0000, #ff4444);
}
.slider-row.red-slider input[type="range"]::-webkit-slider-thumb {
    border-color: var(--red-channel);
    box-shadow: 0 0 8px rgba(255, 68, 68, 0.5);
}
.slider-row.red-slider input[type="range"]::-moz-range-thumb {
    border-color: var(--red-channel);
    box-shadow: 0 0 8px rgba(255, 68, 68, 0.5);
}

.slider-row.green-slider input[type="range"] {
    background: linear-gradient(90deg, #001a00, #44dd44);
}
.slider-row.green-slider input[type="range"]::-webkit-slider-thumb {
    border-color: var(--green-channel);
    box-shadow: 0 0 8px rgba(68, 221, 68, 0.5);
}
.slider-row.green-slider input[type="range"]::-moz-range-thumb {
    border-color: var(--green-channel);
    box-shadow: 0 0 8px rgba(68, 221, 68, 0.5);
}

.slider-row.blue-slider input[type="range"] {
    background: linear-gradient(90deg, #00001a, #4488ff);
}
.slider-row.blue-slider input[type="range"]::-webkit-slider-thumb {
    border-color: var(--blue-channel);
    box-shadow: 0 0 8px rgba(68, 136, 255, 0.5);
}
.slider-row.blue-slider input[type="range"]::-moz-range-thumb {
    border-color: var(--blue-channel);
    box-shadow: 0 0 8px rgba(68, 136, 255, 0.5);
}

.slider-value {
    font-family: var(--font-display);
    font-size: 0.65rem;
    width: 30px;
    text-align: right;
    color: var(--text-secondary);
    flex-shrink: 0;
}

/* Color Preview + Fire Button */
.controls-right {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.color-preview {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    border: 2px solid var(--border-glass);
    box-shadow: 0 0 15px rgba(0,0,0,0.3);
    transition: background var(--transition-fast);
}

.fire-btn {
    width: 64px;
    height: 44px;
    border-radius: var(--radius-md);
    border: 2px solid var(--accent-orange);
    background: linear-gradient(135deg, var(--accent-orange), var(--accent-red));
    color: white;
    font-family: var(--font-display);
    font-size: 0.65rem;
    font-weight: 700;
    cursor: pointer;
    letter-spacing: 1px;
    transition: all var(--transition-fast);
    box-shadow: 0 0 20px rgba(244, 132, 95, 0.3);
    text-transform: uppercase;
}

.fire-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 0 30px rgba(244, 132, 95, 0.5);
}

.fire-btn:active {
    transform: scale(0.95);
}

/* ── Pause Overlay ─────────────────────────────────────── */
#pause-overlay {
    position: absolute;
    inset: 0;
    background: rgba(7, 11, 22, 0.85);
    backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    z-index: 50;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-med);
}
#pause-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.pause-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 900;
    color: var(--accent-cyan);
    margin-bottom: 10px;
}

/* ── Victory Overlay ───────────────────────────────────── */
#victory-overlay {
    position: absolute;
    inset: 0;
    background: rgba(7, 11, 22, 0.9);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    z-index: 50;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-med);
}
#victory-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.victory-title {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 5vw, 2.5rem);
    font-weight: 900;
    background: linear-gradient(135deg, var(--accent-yellow), var(--accent-orange));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: titlePulse 2s ease-in-out infinite;
}

.victory-stars {
    font-size: 2.5rem;
    letter-spacing: 8px;
    animation: starsPopIn 0.6s ease-out;
}

@keyframes starsPopIn {
    0% { transform: scale(0); opacity: 0; }
    60% { transform: scale(1.3); }
    100% { transform: scale(1); opacity: 1; }
}

.victory-score {
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--accent-cyan);
}

.victory-breakdown {
    display: flex;
    flex-direction: column;
    gap: 4px;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* ── Shared Button Styles ──────────────────────────────── */
.btn {
    padding: 12px 32px;
    border-radius: var(--radius-md);
    font-family: var(--font-main);
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    border: 1px solid var(--border-glass);
    transition: all var(--transition-med);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-cyan), #3ba89e);
    color: var(--bg-deep);
    border-color: var(--accent-cyan);
    box-shadow: 0 0 20px rgba(78, 205, 196, 0.2);
}
.btn-primary:hover {
    box-shadow: 0 0 30px rgba(78, 205, 196, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--bg-glass);
    color: var(--text-primary);
}
.btn-secondary:hover {
    background: rgba(78, 205, 196, 0.15);
    border-color: var(--accent-cyan);
}

.btn-danger {
    background: rgba(255, 107, 107, 0.15);
    color: var(--accent-red);
    border-color: rgba(255, 107, 107, 0.3);
}
.btn-danger:hover {
    background: rgba(255, 107, 107, 0.25);
}

/* ── Feedback Toast ────────────────────────────────────── */
.toast {
    position: fixed;
    top: 60px;
    left: 50%;
    transform: translateX(-50%) translateY(-20px);
    padding: 10px 24px;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 0.9rem;
    pointer-events: none;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 100;
    white-space: nowrap;
}

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

.toast.success {
    background: rgba(107, 203, 119, 0.2);
    border: 1px solid var(--accent-green);
    color: var(--accent-green);
    box-shadow: 0 0 20px rgba(107, 203, 119, 0.2);
}

.toast.miss {
    background: rgba(255, 107, 107, 0.2);
    border: 1px solid var(--accent-red);
    color: var(--accent-red);
    box-shadow: 0 0 20px rgba(255, 107, 107, 0.2);
}

/* ── Level Complete Image Preview ──────────────────────── */
.victory-image-preview {
    border: 2px solid var(--border-glow);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-glow);
    margin: 8px 0;
    image-rendering: pixelated;
}

/* ── Settings button in menu ───────────────────────────── */
.menu-footer {
    display: flex;
    gap: 12px;
    margin-top: 10px;
}

.menu-footer .btn {
    font-size: 0.75rem;
    padding: 8px 18px;
}

/* ── How-to-play modal ─────────────────────────────────── */
#howto-overlay {
    position: fixed;
    inset: 0;
    background: rgba(7, 11, 22, 0.92);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-med);
    padding: 20px;
}
#howto-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.howto-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-xl);
    padding: 30px;
    max-width: 480px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
}

.howto-panel h2 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    color: var(--accent-cyan);
    margin-bottom: 16px;
    text-align: center;
}

.howto-panel .step {
    display: flex;
    gap: 12px;
    margin-bottom: 14px;
    align-items: flex-start;
}

.howto-panel .step-num {
    font-family: var(--font-display);
    font-size: 0.85rem;
    color: var(--accent-yellow);
    font-weight: 700;
    flex-shrink: 0;
    width: 24px;
}

.howto-panel .step-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.howto-panel .step-text strong {
    color: var(--text-primary);
}

/* ── Scrollbar Styling ─────────────────────────────────── */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--border-glass);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--border-glow);
}

/* ── Responsive ────────────────────────────────────────── */
@media (max-width: 480px) {
    .path-cards {
        grid-template-columns: 1fr;
    }

    .hud {
        padding: 8px 12px;
    }

    .hud-item {
        font-size: 0.7rem;
    }
    .hud-item span {
        font-size: 0.75rem;
    }

    .controls-dock {
        padding: 10px 12px;
        gap: 10px;
    }

    .slider-row input[type="range"]::-webkit-slider-thumb {
        width: 24px;
        height: 24px;
    }

    .fire-btn {
        width: 56px;
        height: 40px;
    }

    .level-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
}

@media (max-width: 768px) {
    .hud {
        display: grid;
        grid-template-columns: minmax(0, 1fr) auto;
        gap: 0 8px;
        padding: 8px 12px;
        cursor: pointer;
    }

    .hud-primary .hud-item,
    .hud-details .hud-item,
    .hud-pause-btn {
        grid-column: auto;
    }

    .hud-primary {
        display: flex;
        grid-column: 1;
        grid-row: 2;
        min-width: 0;
        gap: 12px;
        align-self: center;
    }

    .hud-primary .hud-item {
        white-space: nowrap;
    }

    .hud-actions {
        display: flex;
        grid-column: 2;
        grid-row: 2;
        justify-self: end;
        align-self: center;
        gap: 8px;
    }

    .hud-expand-btn {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .hud-details {
        display: grid;
        grid-column: 1 / -1;
        grid-row: 1;
        width: 100%;
        box-sizing: border-box;
        min-height: 0;
        max-height: 0;
        overflow: hidden;
        display: grid;
        grid-template-columns: repeat(4, max-content);
        justify-content: space-between;
        align-items: center;
        column-gap: 8px;
        row-gap: 6px;
        padding-top: 0;
        padding-bottom: 0;
        opacity: 0;
        visibility: hidden;
        cursor: default;
        transition: max-height 300ms ease, padding-top 300ms ease, padding-bottom 300ms ease, opacity 180ms ease, visibility 0s linear 300ms;
    }

    .hud-details .hud-item {
        padding: 6px 9px;
        font-size: 0.7rem;
    }

    .hud.hud-details-expanded .hud-details {
        max-height: 180px;
        padding-top: 8px;
        padding-bottom: 10px;
        opacity: 1;
        visibility: visible;
        transition: max-height 300ms ease, padding-top 300ms ease, padding-bottom 300ms ease, opacity 180ms ease, visibility 0s;
        grid-template-columns: repeat(4, 1fr);
        gap: 10px;
        width: 100%;
    }

    .hud.hud-details-expanded .hud-expand-btn svg {
        transform: rotate(180deg);
    }
}

@media (max-width: 480px) {
    .hud-details {
        column-gap: 4px;
    }

    .hud-details .hud-item {
        padding: 4px 5px;
        font-size: 0.6rem;
        white-space: nowrap;
    }

    .hud-details .hud-item span {
        font-size: 0.65rem;
    }
}

@media (max-height: 600px) {
    .controls-dock {
        padding: 8px 12px;
    }
    .rgb-sliders {
        gap: 3px;
    }
    .hud {
        padding: 6px 12px;
        min-height: 38px;
    }
}

/* ── Particle burst keyframes (used by JS) ─────────────── */
@keyframes particleBurst {
    0% { transform: translate(0,0) scale(1); opacity: 1; }
    100% { transform: translate(var(--px), var(--py)) scale(0); opacity: 0; }
}

/* ── Cell fill animation ───────────────────────────────── */
@keyframes cellFill {
    0% { transform: scale(0.5); opacity: 0.5; }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); opacity: 1; }
}