:root {
    --bg: #0a0a0f;
    --primary: #00f2ff;
    --accent: #ff6600;
    --danger: #ff0055;
    --city-color: #00ff88;
    --text: #ffffff;
    --dim: #667;
}

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

body, html {
    width: 100%; height: 100%; overflow: hidden;
    background: var(--bg);
    font-family: 'Segoe UI', Roboto, sans-serif;
    color: var(--text);
    user-select: none;
    cursor: crosshair;
    touch-action: none;
    -webkit-tap-highlight-color: transparent;
}

#glcanvas {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
}

/* Header */
.header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 10;
    display: flex; align-items: center; justify-content: space-between;
    padding: 18px 36px;
    background: linear-gradient(to bottom, rgba(10,10,15,0.95) 0%, transparent 100%);
    pointer-events: none;
}
.header a {
    color: var(--dim); text-decoration: none; font-size: 0.7rem;
    text-transform: uppercase; letter-spacing: 2px; transition: color 0.2s;
    pointer-events: auto;
}
.header a:hover { color: var(--text); }
.header h1 {
    font-size: 0.85rem; text-transform: uppercase; letter-spacing: 10px;
    background: linear-gradient(90deg, var(--accent), var(--danger));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}

/* HUD */
.hud {
    position: fixed; top: 60px; left: 36px; right: 36px; z-index: 10;
    display: flex; justify-content: space-between; align-items: flex-start;
    pointer-events: none;
}
.hud-left { display: flex; flex-direction: column; gap: 2px; }
.hud-score {
    font-size: 2.2rem; font-weight: 800; letter-spacing: 3px;
    font-variant-numeric: tabular-nums;
    background: linear-gradient(90deg, var(--accent), #ffcc00);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hud-wave {
    font-size: 0.75rem; letter-spacing: 4px; text-transform: uppercase;
    color: var(--dim);
}
.hud-right { display: flex; flex-direction: column; align-items: flex-end; gap: 8px; }
.hud-cities { display: flex; gap: 6px; }
.city-pip {
    width: 16px; height: 16px;
    background: var(--city-color);
    clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
    transition: all 0.3s;
}
.city-pip.damaged {
    background: #66dd44;
    opacity: 0.8;
}
.city-pip.critical {
    background: #dd8800;
    opacity: 0.6;
}
.city-pip.destroyed {
    background: #444;
    opacity: 0.3;
}

/* Homing ammo indicator */
.hud-homing {
    display: flex; gap: 4px; align-items: center;
}
.homing-dot {
    width: 10px; height: 10px;
    border-radius: 50%;
    transition: all 0.3s;
}
.homing-dot.full {
    background: var(--accent);
    box-shadow: 0 0 6px var(--accent);
    opacity: 1;
}
.homing-dot.empty {
    background: #333;
    opacity: 0.3;
}

/* Controls */
.controls-hint {
    position: fixed; bottom: 16px; left: 50%; transform: translateX(-50%);
    z-index: 10; pointer-events: none;
    font-size: 0.65rem; letter-spacing: 1px; color: var(--dim);
    text-transform: uppercase;
}

/* Game Over */
.game-over {
    position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    z-index: 20; display: none;
    flex-direction: column; align-items: center; justify-content: center;
    background: rgba(10,10,15,0.92);
    backdrop-filter: blur(8px);
}
.game-over.visible { display: flex; }
.game-over h2 {
    font-size: 2.5rem; letter-spacing: 12px; text-transform: uppercase;
    background: linear-gradient(90deg, var(--accent), var(--danger));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    margin-bottom: 16px;
}
.game-over .final-score {
    font-size: 1.4rem; color: var(--dim); margin-bottom: 8px;
    letter-spacing: 2px;
}
.game-over .high-score {
    font-size: 1rem; color: var(--primary); margin-bottom: 20px;
    letter-spacing: 2px; opacity: 0.7;
}
.game-over .stats {
    display: flex; gap: 32px; margin-bottom: 28px;
    font-size: 0.85rem; color: var(--dim); letter-spacing: 1px;
}
.game-over .stats span { color: var(--primary); font-weight: 700; }
.game-over button {
    padding: 12px 36px;
    background: transparent; border: 1px solid var(--accent);
    color: var(--accent); font-size: 0.85rem; letter-spacing: 3px;
    text-transform: uppercase; cursor: pointer;
    transition: all 0.2s;
}
.game-over button:hover {
    background: var(--accent); color: var(--bg);
}

/* Wave announcement */
.wave-overlay {
    position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%);
    z-index: 15; display: none;
    font-size: 3rem; letter-spacing: 12px; text-transform: uppercase;
    color: var(--danger);
    text-shadow: 0 0 20px rgba(255,0,85,0.5);
    animation: fadeInOut 2s ease-in-out;
}
.wave-overlay.visible { display: block; }
@keyframes fadeInOut {
    0% { opacity: 0; transform: translate(-50%, -50%) scale(0.8); }
    30% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
    70% { opacity: 1; }
    100% { opacity: 0; }
}

/* Version */
.version-overlay {
    position: fixed; bottom: 8px; right: 16px; z-index: 10;
    font-size: 0.6rem; color: var(--dim); opacity: 0.4;
    pointer-events: none; letter-spacing: 1px;
}