:root {
    --ag-bg-dark: #05080f;
    --ag-accent: #10b981; /* Emerald/Green from main site */
    --ag-accent-glow: rgba(16, 185, 129, 0.4);
    --ag-text: #e2e8f0;
    --ag-gold: #fbbf24;
    --ag-red: #ef4444;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body.invader-page {
    background-color: var(--ag-bg-dark);
    color: var(--ag-text);
    font-family: 'Outfit', sans-serif;
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Background Particle Starfield */
#starfield-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.game-container {
    width: 100%;
    max-width: 1200px;
    height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 1rem;
    position: relative;
    z-index: 1;
}

/* Header */
.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.back-link {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.8rem;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: color 0.3s ease;
}

.back-link:hover {
    color: var(--ag-accent);
}

.game-title {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 3px;
    color: #fff;
    text-shadow: 0 0 20px var(--ag-accent-glow);
}

.game-title .accent {
    color: var(--ag-accent);
}

.score-board {
    background: rgba(255, 255, 255, 0.05);
    padding: 0.5rem 1.2rem;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.score-board .label {
    font-size: 0.7rem;
    opacity: 0.6;
    font-weight: 700;
}

.score-board .value {
    font-size: 1.2rem;
    font-family: 'Space Grotesk', sans-serif;
    color: var(--ag-gold);
    font-weight: 700;
}

/* Canvas Area */
.canvas-wrapper {
    flex-grow: 1;
    position: relative;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    overflow: hidden;
    box-shadow: inset 0 0 50px rgba(0, 0, 0, 0.5);
}

canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* Overlays (Start/Game Over) */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(5, 8, 15, 0.8);
    backdrop-filter: blur(15px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.overlay.active {
    display: flex;
    opacity: 1;
}

.overlay-content {
    text-align: center;
    max-width: 500px;
    padding: 3rem;
    animation: contentPop 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes contentPop {
    from { transform: scale(0.8); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.massive-text {
    font-size: 3.5rem;
    font-weight: 900;
    margin-bottom: 1.5rem;
    letter-spacing: -2px;
    line-height: 1;
}

.massive-text .accent {
    color: var(--ag-accent);
    text-shadow: 0 0 30px var(--ag-accent-glow);
}

.mission-desc {
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 2rem;
    color: rgba(255, 255, 255, 0.7);
}

.crystal-icon {
    font-size: 3rem;
    color: var(--ag-accent);
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 0 15px var(--ag-accent-glow));
}

.controls-guide {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    margin-bottom: 2.5rem;
    background: rgba(255, 255, 255, 0.05);
    padding: 1.5rem;
    border-radius: 16px;
}

.guide-item {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
}

.key {
    background: #fff;
    color: #000;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-weight: 800;
    font-family: 'Space Grotesk', sans-serif;
    margin: 0 0.3rem;
}

/* Buttons */
.play-btn, .retry-btn {
    background: var(--ag-accent);
    color: #fff;
    border: none;
    padding: 1.2rem 2.5rem;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 800;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    box-shadow: 0 10px 30px rgba(16, 185, 129, 0.3);
}

.play-btn:hover, .retry-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(16, 185, 129, 0.5);
    background: #12d695;
}

.final-score {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 2rem;
    font-family: 'Space Grotesk', sans-serif;
}

.final-score span {
    color: var(--ag-gold);
}

.share-text {
    margin-top: 2rem;
    font-size: 0.8rem;
    opacity: 0.4;
    letter-spacing: 2px;
}

/* Wave Clear Concept Text */
.concept-message-box {
    animation: fadeInScale 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.wave-title-text {
    font-size: 1.5rem;
    color: var(--ag-accent);
    letter-spacing: 5px;
    margin-bottom: 1rem;
    font-weight: 700;
    opacity: 0.8;
}

.concept-text {
    font-size: 2.8rem;
    font-weight: 800;
    color: #fff;
    line-height: 1.3;
    text-shadow: 0 0 40px rgba(255, 255, 255, 0.3);
    background: linear-gradient(135deg, #fff, var(--ag-accent));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

@keyframes fadeInScale {
    from { opacity: 0; transform: scale(0.9) translateY(20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

/* Footer Status */
.game-footer {
    padding: 1rem 0;
}

.status-bar {
    display: flex;
    gap: 2rem;
    justify-content: center;
}

.status-item {
    font-weight: 700;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.status-item i {
    color: var(--ag-red);
}

.status-item:last-child i {
    color: var(--ag-accent);
}

/* Responsive */
@media (max-width: 768px) {
    .massive-text { font-size: 2.5rem; }
    .overlay-content { padding: 1.5rem; }
    .game-title { font-size: 1.2rem; }
    .game-header { flex-direction: column; gap: 1rem; }
    .score-board { width: 100%; align-items: center; }
}