:root {
    color-scheme: dark;
}

html,
body {
    width: 100%;
    min-height: 100%;
}

body {
    min-height: 100vh;
    overflow: hidden;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

button,
input {
    font: inherit;
}

.hidden,
.screen.hidden {
    display: none !important;
}

.screen {
    position: fixed;
    inset: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: auto;
    padding: clamp(1rem, 3vw, 2rem);
    background:
        linear-gradient(rgba(2, 7, 12, 0.83), rgba(2, 7, 12, 0.94)),
        radial-gradient(circle at center, #12333c, #02070c 65%);
}

#game-screen {
    z-index: 1;
    padding: 0;
    overflow: hidden;
    background: #000;
}

.app-header {
    position: fixed;
    top: 1rem;
    left: 50%;
    z-index: 50;
    transform: translateX(-50%);
    pointer-events: none;
}

#main-title {
    color: var(--color-primary);
    font-size: clamp(1rem, 2.5vw, 1.8rem);
    letter-spacing: 0.18em;
    text-shadow: 0 0 14px rgba(32, 227, 210, 0.7);
    cursor: pointer;
    user-select: none;
    pointer-events: auto;
    white-space: nowrap;
}

#game-screen:not(.hidden) ~ .app-header,
body.game-active .app-header {
    display: none;
}

.game-card,
.box {
    width: min(680px, 96vw);
    padding: clamp(1.25rem, 4vw, 2.25rem);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: rgba(5, 18, 26, 0.94);
    box-shadow: var(--shadow-md), inset 0 0 32px rgba(32, 227, 210, 0.035);
    text-align: center;
    backdrop-filter: blur(12px);
}

.game-card::before {
    content: "";
    display: block;
    width: 74px;
    height: 2px;
    margin: 0 auto 1.25rem;
    background: var(--color-primary);
    box-shadow: 0 0 12px var(--color-primary);
}

.game-card h2 {
    margin-bottom: 1rem;
    color: var(--color-primary);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.game-card p {
    margin-bottom: 1rem;
    color: var(--color-text-light);
}

.form-group {
    text-align: left;
}

.input {
    color: var(--color-text);
    background: #020a10;
}

.btn {
    min-height: 48px;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

.btn-primary {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, var(--color-primary-dark), #08716f);
    color: #efffff;
    box-shadow: 0 0 18px rgba(32, 227, 210, 0.2);
}

.button-stack {
    display: grid;
    gap: 0.75rem;
    margin-top: 1.25rem;
}

.error-message {
    display: none;
    margin-top: 0.75rem;
    color: #ffd5da;
    border: 1px solid var(--color-error);
    border-radius: var(--radius-sm);
    padding: 0.65rem;
    background: rgba(255, 64, 87, 0.12);
}

.error-message.show {
    display: block;
}

.version-info {
    margin-top: 1rem;
    color: var(--color-text-light);
    font-size: 0.78rem;
}

#menu-screen .game-card,
#gameover-screen .game-card,
#victory-screen .game-card {
    width: min(1180px, 98vw);
    max-width: 1180px;
    text-align: left;
}

#menu-screen .game-card > h2,
#gameover-screen .game-card > h2,
#victory-screen .game-card > h2 {
    text-align: center;
}

.menu-grid {
    display: grid;
    grid-template-columns: minmax(280px, 1fr) minmax(720px, 900px);
    gap: 1.25rem;
    align-items: start;
    text-align: left;
}

@media (max-width: 1080px) {
    .menu-grid {
        grid-template-columns: 1fr;
    }

    .leaderboard-wrap {
        min-width: 0;
        max-width: none;
    }
}

.mission-brief,
.leaderboard-wrap {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 1rem;
    background: rgba(0, 0, 0, 0.2);
}

.leaderboard-wrap {
    min-width: min(720px, 100%);
    max-width: 900px;
    width: 100%;
}

.leaderboard-wrap h3 {
    margin: 0 0 0.75rem;
    color: var(--color-primary);
    font-size: 0.95rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.leaderboard-panel {
    width: 100%;
    overflow-x: auto;
}

.leaderboard-table {
    width: 100%;
    table-layout: fixed;
    border-collapse: collapse;
}

.leaderboard-table th,
.leaderboard-table td {
    padding: 0.55rem 0.75rem;
    vertical-align: middle;
}

.leaderboard-table .col-rank {
    width: 3rem;
    text-align: center;
}

.leaderboard-table .col-name {
    width: auto;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.leaderboard-table .col-score {
    width: 7.5rem;
    text-align: right;
    font-variant-numeric: tabular-nums;
}

.leaderboard-table .col-level {
    width: 5.5rem;
    text-align: center;
}

.leaderboard-table tbody tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.03);
}

.empty-state {
    margin: 0;
    color: var(--color-text-light);
    font-size: 0.88rem;
}

.mission-brief ul {
    padding-left: 1.2rem;
    color: var(--color-text-light);
}

.quality-control {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin: 1rem 0;
}

.table {
    color: var(--color-text);
    font-size: 0.84rem;
}

.table th {
    color: var(--color-primary);
}

.table td,
.table th {
    padding: 0.45rem;
    border-color: var(--color-border);
}

#loading-progress {
    width: 100%;
    height: 8px;
    overflow: hidden;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background: #010508;
}

#loading-progress-bar {
    width: 0;
    height: 100%;
    background: var(--color-primary);
    box-shadow: 0 0 14px var(--color-primary);
    transition: width 0.15s linear;
}

#game-canvas {
    display: block;
    width: 100%;
    height: 100%;
    outline: none;
}

#hud {
    position: absolute;
    inset: 0;
    z-index: 2;
    pointer-events: none;
    color: #d9fff9;
    text-shadow: 0 1px 3px #000;
}

.hud-panel {
    position: absolute;
    padding: 0.65rem 0.85rem;
    border: 1px solid rgba(32, 227, 210, 0.45);
    border-radius: 4px;
    background: linear-gradient(135deg, rgba(3, 13, 20, 0.78), rgba(3, 20, 25, 0.58));
    box-shadow: inset 0 0 14px rgba(32, 227, 210, 0.08);
}

.hud-top-left {
    top: 1rem;
    left: 1rem;
    min-width: 230px;
}

.hud-top-right {
    top: 1rem;
    right: 1rem;
    text-align: right;
}

.hud-bottom-right {
    right: 1rem;
    bottom: 1rem;
}

.health-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.35rem;
}

.health-track {
    width: 210px;
    height: 11px;
    overflow: hidden;
    border: 1px solid #407473;
    background: #030709;
}

#health-bar {
    width: 100%;
    height: 100%;
    background: #43ff81;
    box-shadow: 0 0 8px currentColor;
    transition: width 0.18s ease, background-color 0.18s ease;
}

#radar {
    position: absolute;
    left: 1rem;
    bottom: 1rem;
    width: 150px;
    height: 150px;
    border: 2px solid rgba(32, 227, 210, 0.75);
    border-radius: 50%;
    background:
        linear-gradient(90deg, transparent 49.5%, rgba(32, 227, 210, 0.2) 50%, transparent 50.5%),
        linear-gradient(transparent 49.5%, rgba(32, 227, 210, 0.2) 50%, transparent 50.5%),
        radial-gradient(circle, rgba(32, 227, 210, 0.08), rgba(0, 8, 10, 0.85));
    box-shadow: inset 0 0 24px rgba(32, 227, 210, 0.2), 0 0 10px rgba(32, 227, 210, 0.25);
}

#radar::after {
    content: "";
    position: absolute;
    inset: 50% auto auto 50%;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: #fff;
    transform: translate(-50%, -50%);
}

.radar-dot {
    position: absolute;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 6px currentColor;
}

.radar-enemy {
    color: #ff4057;
    background: currentColor;
}

.radar-boss {
    width: 11px;
    height: 11px;
}

.radar-ceiling {
    animation: radar-ceiling-blink 0.52s steps(2, jump-none) infinite;
}

@keyframes radar-ceiling-blink {
    50% {
        opacity: 0.18;
        transform: translate(-50%, -50%) scale(1.35);
    }
}

.radar-pickup {
    color: #43ff81;
    background: currentColor;
}

#crosshair {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 22px;
    height: 22px;
    transform: translate(-50%, -50%);
}

#crosshair::before,
#crosshair::after {
    content: "";
    position: absolute;
    background: rgba(159, 255, 246, 0.85);
    box-shadow: 0 0 5px rgba(32, 227, 210, 0.8);
}

#crosshair::before {
    top: 10px;
    left: 0;
    width: 22px;
    height: 2px;
}

#crosshair::after {
    top: 0;
    left: 10px;
    width: 2px;
    height: 22px;
}

#boss-warning,
#section-message {
    position: absolute;
    top: 16%;
    left: 50%;
    transform: translateX(-50%);
    color: #ff4057;
    font-size: clamp(1.4rem, 4vw, 3rem);
    font-weight: 900;
    letter-spacing: 0.15em;
    text-align: center;
    text-shadow: 0 0 16px currentColor;
    animation: warning-pulse 0.75s infinite alternate;
}

#section-message {
    top: 24%;
    color: var(--color-primary);
    font-size: clamp(1rem, 2.5vw, 1.65rem);
}

#damage-vignette,
#heal-flash {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 0.25s ease;
}

#damage-vignette {
    box-shadow: inset 0 0 130px 45px rgba(255, 0, 28, 0.86);
}

#heal-flash {
    background: rgba(45, 255, 104, 0.16);
}

#damage-vignette.flash,
#heal-flash.flash {
    opacity: 1;
}

.mobile-warning {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    color: var(--color-text);
    background: #02070c;
    text-align: center;
}

@keyframes warning-pulse {
    from { opacity: 0.5; transform: translateX(-50%) scale(0.96); }
    to { opacity: 1; transform: translateX(-50%) scale(1.04); }
}

@media (max-width: 720px) {
    .menu-grid {
        grid-template-columns: 1fr;
    }

    .app-header {
        top: 0.5rem;
    }

    .game-card {
        margin-top: 2rem;
    }
}

.brightness-control {
    display: grid;
    gap: 0.35rem;
    margin: 0.75rem 0 1rem;
}

.brightness-control label {
    display: flex;
    justify-content: space-between;
}

#brightness-slider {
    width: 100%;
    accent-color: var(--color-primary);
}

.hud-oxygen {
    top: 7.7rem;
    left: 1rem;
    min-width: 230px;
    border-color: rgba(70, 174, 255, 0.8);
}

.oxygen-track {
    width: 210px;
    height: 9px;
    overflow: hidden;
    border: 1px solid #4ba9e8;
    background: #03111d;
}

#oxygen-bar {
    width: 100%;
    height: 100%;
    background: #48b8ff;
    box-shadow: 0 0 9px #48b8ff;
}

.hud-turret {
    right: 1rem;
    bottom: 4.9rem;
}

#self-destruct-panel {
    position: absolute;
    top: 1rem;
    left: 50%;
    padding: 0.65rem 1.2rem;
    transform: translateX(-50%);
    border: 2px solid #ff4057;
    border-radius: 4px;
    color: #fff;
    background: rgba(65, 0, 8, 0.85);
    font-size: clamp(1rem, 2.5vw, 1.6rem);
    letter-spacing: 0.1em;
    box-shadow: 0 0 22px rgba(255, 64, 87, 0.65);
    animation: warning-pulse 0.55s infinite alternate;
}

#context-hint {
    position: absolute;
    left: 50%;
    bottom: 18%;
    transform: translateX(-50%);
    padding: 0.55rem 0.9rem;
    border: 1px solid var(--color-primary);
    border-radius: 4px;
    background: rgba(1, 9, 13, 0.9);
    color: #fff;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-shadow: 0 0 8px var(--color-primary);
}

.radar-survivor {
    color: #4baeff;
    background: currentColor;
}

.radar-special {
    color: #ffd34b;
    background: currentColor;
}

body.self-destruct-active #hud {
    box-shadow: inset 0 0 90px rgba(255, 20, 35, 0.25);
    animation: self-destruct-strobe 1s infinite;
}

@keyframes self-destruct-strobe {
    0%, 75% { background: transparent; }
    80% { background: rgba(255, 0, 20, 0.12); }
    90% { background: transparent; }
    95% { background: rgba(255, 0, 20, 0.16); }
}

#render-stats {
    position: absolute;
    right: 1rem;
    bottom: 7.6rem;
    z-index: 8;
    min-width: 180px;
    margin: 0;
    padding: 0.55rem 0.7rem;
    border: 1px solid rgba(56, 255, 218, 0.55);
    border-radius: 3px;
    color: #9fffea;
    background: rgba(0, 8, 12, 0.84);
    font-size: 0.7rem;
    line-height: 1.35;
    pointer-events: none;
}