:root {
    --bg: #09090b;
    --core: #38bdf8;
    --danger: #ef4444;
    --success: #22c55e;
    --text: #e2e8f0;
    --panel: #18181b;
}

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

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Share Tech Mono', monospace;
    overflow: hidden;
    user-select: none;
}

/* Modals */
.modal {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(0,0,0,0.85);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}
.modal.open {
    opacity: 1;
    pointer-events: auto;
}
.modal-content {
    background: var(--panel);
    border: 1px solid var(--core);
    padding: 2rem;
    max-w: 400px;
    width: 90%;
    text-align: center;
    box-shadow: 0 0 20px rgba(56, 189, 248, 0.2);
}
.modal-content h1 {
    color: var(--core);
    margin-bottom: 1rem;
    font-size: 2rem;
}
.modal-content p { margin-bottom: 1.5rem; line-height: 1.5; color: #a1a1aa; }

input {
    width: 100%;
    background: #000;
    border: 1px solid #3f3f46;
    color: var(--core);
    padding: 0.75rem;
    margin-bottom: 1rem;
    font-family: inherit;
    font-size: 1rem;
    outline: none;
}
input:focus { border-color: var(--core); box-shadow: 0 0 10px rgba(56, 189, 248, 0.3); }

button {
    width: 100%;
    background: var(--core);
    color: #000;
    border: none;
    padding: 0.75rem;
    font-family: inherit;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 0.5rem;
}
button:disabled { background: #3f3f46; cursor: not-allowed; }
button:not(:disabled):hover { background: #7dd3fc; box-shadow: 0 0 15px var(--core); }
button.secondary { background: transparent; border: 1px solid var(--core); color: var(--core); }
button.secondary:hover { background: rgba(56, 189, 248, 0.1); }


/* Game Layout */
.game-container {
    height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    display: flex;
    justify-content: space-between;
    padding: 1rem 2rem;
    border-bottom: 1px solid #27272a;
}
.exit-link { color: var(--danger); text-decoration: none; }
.exit-link:hover { text-shadow: 0 0 10px var(--danger); }

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

#target-definition {
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: 3rem;
    min-height: 4rem;
    color: #fff;
    text-shadow: 0 0 5px rgba(255,255,255,0.5);
}

.reactor-area {
    position: relative;
    width: 300px;
    height: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.core {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--core) 0%, transparent 70%);
    border: 2px solid var(--core);
    box-shadow: 0 0 30px var(--core), inset 0 0 20px var(--core);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
    color: #fff;
    z-index: 10;
}
.core.pulse { animation: pulse 2s infinite alternate; }
.core.success { border-color: var(--success); box-shadow: 0 0 50px var(--success); color: var(--success); background: radial-gradient(circle, var(--success) 0%, transparent 70%); animation: none; }
.core.error { border-color: var(--danger); box-shadow: 0 0 50px var(--danger); color: var(--danger); background: radial-gradient(circle, var(--danger) 0%, transparent 70%); animation: none; }

@keyframes pulse {
    0% { transform: scale(1); box-shadow: 0 0 20px var(--core); }
    100% { transform: scale(1.05); box-shadow: 0 0 40px var(--core); }
}

.particles-container {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
}
.particle {
    position: absolute;
    width: 80px; height: 40px;
    background: var(--panel);
    border: 1px solid #52525b;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    padding: 0; margin: 0;
}
.particle:hover { border-color: var(--core); box-shadow: 0 0 10px var(--core); }

/* Orbit positions */
.particle[data-index="0"] { top: 0; left: 50%; transform: translate(-50%, -50%); }
.particle[data-index="1"] { bottom: 0; left: 50%; transform: translate(-50%, 50%); }
.particle[data-index="2"] { top: 50%; left: 0; transform: translate(-50%, -50%); }
.particle[data-index="3"] { top: 50%; right: 0; transform: translate(50%, -50%); }

.timer-container {
    height: 10px;
    background: #18181b;
    width: 100%;
}
#timer-bar {
    height: 100%;
    width: 100%;
    background: var(--core);
    transition: width 0.1s linear, background-color 0.3s;
}