* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", Roboto, sans-serif;
    color: #f4f4f4;
    background: #0d0d1a;
    overflow: hidden;
}

#scene {
    width: 100vw;
    height: 100vh;
    display: block;
}

#loading {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    letter-spacing: 0.05em;
    background: rgba(10, 14, 23, 0.95);
    z-index: 10;
}

#overlay {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at top, rgba(22, 35, 63, 0.9), rgba(5, 8, 15, 0.95));
    backdrop-filter: blur(8px);
    z-index: 5;
}

#overlay.hidden {
    display: none;
}

.panel.hidden {
    display: none;
}

.panel {
    padding: 2.5rem;
    border-radius: 18px;
    background: linear-gradient(160deg, rgba(30, 46, 79, 0.95), rgba(12, 18, 30, 0.9));
    box-shadow: 0 25px 45px rgba(0, 0, 0, 0.35);
    text-align: center;
    max-width: 420px;
    width: 90%;
}

.panel h1 {
    margin-top: 0;
    font-size: 2.2rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.panel p {
    margin: 0.75rem 0 1.5rem;
    color: rgba(255, 255, 255, 0.85);
}

.panel ul {
    margin: 1.8rem 0 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 0.35rem;
    color: rgba(255, 255, 255, 0.75);
    font-size: 0.9rem;
}

.panel h2 {
    margin: 0 0 1.25rem;
    font-size: 1.6rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

#startButton {
    padding: 0.9rem 2.7rem;
    border: none;
    border-radius: 999px;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #0d1120;
    background: linear-gradient(135deg, #58d5ff, #788bff);
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

#startButton:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 25px rgba(90, 160, 255, 0.4);
}

#resumeButton {
    padding: 0.9rem 2.4rem;
    border: none;
    border-radius: 999px;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: #0d1120;
    background: linear-gradient(135deg, #88f7ff, #5f7cff);
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

#resumeButton:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 24px rgba(111, 190, 255, 0.35);
}

.setting-group {
    display: grid;
    gap: 0.6rem;
    text-align: left;
    margin-bottom: 1.5rem;
}

.setting-group label {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.85);
}

.setting-group input[type="range"] {
    width: 100%;
    accent-color: #7fa0ff;
}

.setting-buttons {
    display: flex;
    justify-content: center;
}

#hud {
    position: fixed;
    top: 4vh;
    left: 4vw;
    z-index: 4;
    pointer-events: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#stats {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1.2rem;
    border-radius: 16px;
    background: rgba(6, 10, 18, 0.78);
    border: 1px solid rgba(120, 160, 255, 0.24);
    box-shadow: 0 10px 24px rgba(3, 6, 12, 0.45);
    font-size: 0.95rem;
}

#stats span {
    font-weight: 600;
    color: rgba(235, 244, 255, 0.92);
    text-shadow: 0 0 14px rgba(90, 140, 255, 0.35);
}

#monsterHealth {
    position: fixed;
    bottom: 72px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 18px;
    font-weight: 600;
    color: #ffe8c2;
    text-shadow: 0 0 10px rgba(0, 0, 0, 0.45);
    opacity: 0;
    transition: opacity 0.15s ease;
    pointer-events: none;
}

#monsterHealth.visible {
    opacity: 1;
}

#hint {
    padding: 0.75rem 1.25rem;
    border-radius: 14px;
    background: rgba(12, 18, 30, 0.75);
    border: 1px solid rgba(120, 139, 255, 0.25);
    min-width: 220px;
    text-align: center;
    font-size: 0.9rem;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

#hint.visible {
    opacity: 1;
    transform: translateY(0);
}

#crosshair {
    display: none;
}

#damageOverlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(circle at center, rgba(255, 80, 80, 0.35), rgba(90, 0, 0, 0.9));
    opacity: 0;
    transition: opacity 0.4s ease;
    mix-blend-mode: screen;
    z-index: 3;
}