:root {
    --bg-dark: #07070d;
    --card-bg: rgba(14, 15, 26, 0.82);
    --card-border: rgba(0, 243, 255, 0.35);
    --accent-cyan: #00f3ff;
    --accent-pink: #ff007f;
    --accent-gold: #ffd700;
    --accent-purple: #9d4edd;
    --text-main: #f0f4fc;
    --text-muted: #9aa5be;
    --kbd-bg: rgba(255, 255, 255, 0.08);
    --kbd-border: rgba(255, 255, 255, 0.22);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
    -webkit-user-select: none;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--bg-dark);
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--text-main);
}

#gl-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
    cursor: grab;
}

#gl-canvas:active {
    cursor: grabbing;
}

/* ==================== Top HUD Bar ==================== */
.hud-panel {
    position: fixed;
    top: 14px;
    left: 14px;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 14px;
    background: rgba(10, 11, 20, 0.72);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 999px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
    font-family: 'Fira Code', monospace;
    font-size: 13px;
    z-index: 100;
    transition: opacity 0.2s ease;
}

.hud-item {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--text-muted);
}

.hud-item strong {
    color: var(--accent-cyan);
}

.hud-item .val {
    color: #ffffff;
    font-weight: 600;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--accent-cyan);
    box-shadow: 0 0 10px var(--accent-cyan);
    animation: pulse 2s infinite ease-in-out;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.4); opacity: 0.6; }
}

.hud-title {
    color: #fff;
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    letter-spacing: 1px;
    margin-right: 4px;
}

.hud-pill {
    background: rgba(255, 255, 255, 0.06);
    padding: 2px 8px;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.hud-pill.active {
    background: rgba(0, 243, 255, 0.15);
    border-color: rgba(0, 243, 255, 0.5);
}

.hud-pill.active .val {
    color: var(--accent-cyan);
}

.hud-button {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-main);
    padding: 4px 10px;
    border-radius: 999px;
    font-family: 'Fira Code', monospace;
    font-size: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s ease;
}

.hud-button:hover {
    background: rgba(0, 243, 255, 0.2);
    border-color: var(--accent-cyan);
    box-shadow: 0 0 12px rgba(0, 243, 255, 0.35);
}

.hud-button kbd {
    background: rgba(0, 0, 0, 0.35);
    padding: 1px 5px;
    border-radius: 4px;
    font-size: 11px;
}

/* ==================== Modal Overlay ==================== */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(4, 5, 12, 0.65);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.3s ease;
    padding: 20px;
}

.modal-backdrop.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.fractal-card {
    position: relative;
    max-width: 620px;
    width: 100%;
    background: var(--card-bg);
    border: 1px solid rgba(0, 243, 255, 0.3);
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7),
                0 0 40px rgba(0, 243, 255, 0.15),
                inset 0 0 20px rgba(157, 78, 221, 0.08);
    overflow: hidden;
    transform: scale(1);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-backdrop.hidden .fractal-card {
    transform: scale(0.94) translateY(10px);
}

.card-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 50% 20%, rgba(0, 243, 255, 0.12) 0%, rgba(255, 0, 127, 0.08) 35%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.close-btn {
    position: absolute;
    top: 16px;
    right: 18px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: var(--text-muted);
    font-size: 20px;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    z-index: 10;
}

.close-btn:hover {
    background: rgba(255, 0, 127, 0.25);
    border-color: var(--accent-pink);
    color: #fff;
}

.card-header {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 28px 28px 20px 28px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.fractal-icon {
    width: 52px;
    height: 52px;
    flex-shrink: 0;
    color: var(--accent-cyan);
    filter: drop-shadow(0 0 12px rgba(0, 243, 255, 0.6));
    animation: rotateIcon 40s linear infinite;
}

@keyframes rotateIcon {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.neon-svg {
    width: 100%;
    height: 100%;
}

.card-header h1 {
    font-size: 24px;
    font-weight: 900;
    letter-spacing: 1.5px;
    background: linear-gradient(135deg, #ffffff 30%, var(--accent-cyan) 80%, var(--accent-pink) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

.card-body {
    position: relative;
    z-index: 1;
    padding: 24px 28px 28px 28px;
}

.controls-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 24px;
}

@media (max-width: 580px) {
    .controls-grid {
        grid-template-columns: 1fr;
    }
}

.control-group {
    background: rgba(0, 0, 0, 0.32);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 14px;
    padding: 16px;
}

.control-group h3 {
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent-cyan);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.group-icon {
    font-size: 14px;
}

.control-row {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 10px;
    font-size: 13px;
    line-height: 1.4;
}

.control-row:last-child {
    margin-bottom: 0;
}

.keys {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: 4px;
    min-width: 68px;
}

kbd {
    display: inline-block;
    background: var(--kbd-bg);
    border: 1px solid var(--kbd-border);
    border-bottom: 2px solid rgba(255, 255, 255, 0.35);
    border-radius: 5px;
    padding: 2px 7px;
    font-family: 'Fira Code', monospace;
    font-size: 11px;
    font-weight: 700;
    color: #ffffff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
}

.desc {
    color: var(--text-main);
}

.desc strong {
    color: var(--accent-gold);
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.tip-bar {
    font-size: 12px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

.tip-tag {
    background: rgba(255, 0, 127, 0.2);
    color: var(--accent-pink);
    border: 1px solid rgba(255, 0, 127, 0.4);
    font-size: 10px;
    font-weight: 700;
    padding: 1px 6px;
    border-radius: 4px;
    letter-spacing: 0.5px;
}

.explore-btn {
    background: linear-gradient(135deg, var(--accent-cyan), #0077ff);
    color: #030814;
    font-family: 'Outfit', sans-serif;
    font-size: 14px;
    font-weight: 700;
    padding: 10px 22px;
    border: none;
    border-radius: 999px;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(0, 243, 255, 0.4);
    transition: all 0.2s ease;
}

.explore-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 25px rgba(0, 243, 255, 0.6);
}

.explore-btn:active {
    transform: translateY(1px);
}