/* Space Runner - Estilo Vektor Web */
:root {
    --bg-primary: #0a0a1a;
    --bg-secondary: #12122a;
    --bg-card: #1a1a3a;
    --gradient-main: linear-gradient(135deg, #12d6ff 0%, #7a2cff 50%, #ff2fd6 100%);
    --gradient-gold: linear-gradient(135deg, #ffd700 0%, #ffaa00 50%, #ffd700 100%);
    --color-cyan: #12d6ff;
    --color-purple: #7a2cff;
    --color-magenta: #ff2fd6;
    --text-primary: #ffffff;
    --text-secondary: #b0b0c0;
    --border-radius: 12px;
    --transition-fast: 0.2s ease;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: 'Segoe UI', system-ui, sans-serif; background: var(--bg-primary); color: var(--text-primary); min-height: 100vh; line-height: 1.6; overflow-x: hidden; display: flex; flex-direction: column; }

.game-wrapper { flex: 1; display: flex; flex-direction: column; }

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 2rem;
    background: linear-gradient(90deg, #1a1a3a 0%, #0d0d1a 50%, #1a1a3a 100%);
    border-bottom: 2px solid rgba(18, 214, 255, 0.3);
    position: relative;
    flex-shrink: 0;
}

.header-left { text-align: center; flex: 1; }
.header-left h1 {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 3px;
}

.stats-bar { display: flex; gap: 1.5rem; }
.stat { display: flex; flex-direction: column; align-items: flex-end; }
.stat-label { font-size: 0.65rem; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 1px; }
.stat-value { font-size: 1rem; font-weight: 700; color: var(--color-cyan); }

.btn-pause {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    padding: 0.5rem;
    cursor: pointer;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}
.btn-pause:hover { background: rgba(255, 255, 255, 0.2); border-color: var(--color-cyan); }

.game-container { flex: 1; position: relative; display: flex; min-height: 400px; }

#gameCanvas {
    flex: 1;
    width: 100%;
    height: 100%;
    background: var(--bg-secondary);
    display: block;
    cursor: none;
}

.game-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(10, 10, 26, 0.9);
    backdrop-filter: blur(8px);
    transition: opacity var(--transition-fast);
}

.game-overlay.hidden { opacity: 0; pointer-events: none; }

.pause-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(10, 10, 26, 0.95);
    backdrop-filter: blur(8px);
    z-index: 10;
}

.pause-overlay.hidden { display: none; }

.pause-content { text-align: center; padding: 2rem; }
.pause-content h2 { font-size: 2.5rem; font-weight: 900; background: var(--gradient-main); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: 2rem; }

.start-content { text-align: center; padding: 2rem; }
.start-content h2 { font-size: 2.5rem; font-weight: 900; background: var(--gradient-main); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: 0.5rem; }
.subtitle { color: var(--text-secondary); font-size: 1.1rem; margin-bottom: 0.5rem; }
.controls-hint { color: var(--text-secondary); font-size: 0.85rem; margin-bottom: 2rem; opacity: 0.7; }

.btn { padding: 1rem 2rem; font-size: 1rem; font-weight: 700; border: none; border-radius: var(--border-radius); cursor: pointer; transition: all var(--transition-fast); text-transform: uppercase; letter-spacing: 2px; display: inline-block; margin: 0.25rem; }
.btn-primary { background: var(--gradient-main); color: #fff; box-shadow: 0 4px 20px rgba(18, 214, 255, 0.4); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 30px rgba(18, 214, 255, 0.6); }
.btn-secondary { background: var(--bg-card); color: var(--text-primary); border: 2px solid rgba(255, 215, 0, 0.3); }
.btn-secondary:hover { border-color: var(--color-cyan); box-shadow: 0 0 20px rgba(18, 214, 255, 0.3); }

.level-up-indicator {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3rem;
    font-weight: 900;
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0;
    pointer-events: none;
    animation: levelUp 2s ease-out forwards;
}

@keyframes levelUp {
    0% { opacity: 0; transform: translate(-50%, -50%) scale(0.5); }
    20% { opacity: 1; transform: translate(-50%, -50%) scale(1.2); }
    80% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
    100% { opacity: 0; transform: translate(-50%, -50%) scale(1); }
}

@media (max-width: 600px) {
    .game-header { flex-wrap: wrap; gap: 0.5rem; padding: 0.5rem 1rem; }
    .header-left { order: 1; flex: 1; }
    .header-left h1 { font-size: 1.1rem; }
    .stats-bar { order: 2; width: 100%; justify-content: center; gap: 1rem; margin-top: 0.5rem; }
    .stat-value { font-size: 0.9rem; }
    .btn-pause { order: 3; padding: 0.35rem; }
    .controls-hint { display: none; }
    .start-content h2, .pause-content h2 { font-size: 1.8rem; }
    #gameCanvas { touch-action: none; }
}

@media (min-width: 601px) and (max-width: 1024px) {
    .game-header { padding: 0.75rem 1.5rem; }
    .header-left h1 { font-size: 1.3rem; }
    .stats-bar { gap: 1.2rem; }
    .stat-label { font-size: 0.75rem; }
    .stat-value { font-size: 1.1rem; }
    #gameCanvas { touch-action: none; }
}