:root {
    color-scheme: dark;
    --void: #0B0F19;
    --neon-green: #39FF88;
    --neon-red: #FF315A;
    --neon-purple: #A855F7;
    --neon-blue: #38BDF8;
    --safe-bottom: env(safe-area-inset-bottom, 0px);
}

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

html {
    min-height: 100%;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

body {
    background:
        radial-gradient(circle at top left, rgba(57, 255, 136, 0.16), transparent 34rem),
        radial-gradient(circle at top right, rgba(255, 49, 90, 0.14), transparent 30rem),
        radial-gradient(circle at bottom, rgba(168, 85, 247, 0.12), transparent 34rem),
        var(--void);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
    padding-bottom: var(--safe-bottom);
}

button,
a,
input {
    touch-action: manipulation;
}

input,
textarea,
select,
button {
    font: inherit;
}

input,
textarea,
select {
    font-size: 16px;
}

button:disabled {
    cursor: not-allowed;
    filter: grayscale(0.25);
    opacity: 0.68;
}

.skip-link {
    background: var(--neon-green);
    border-radius: 999px;
    color: #06120b;
    font-weight: 900;
    left: 1rem;
    padding: 0.75rem 1rem;
    position: fixed;
    top: 0.75rem;
    transform: translateY(-150%);
    transition: transform 180ms ease;
    z-index: 100;
}

.skip-link:focus {
    transform: translateY(0);
}

.site-shell {
    min-height: 100vh;
    min-height: 100dvh;
    position: relative;
    overflow-x: hidden;
}

.site-shell::before {
    background-image: linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
    background-size: 38px 38px;
    content: "";
    inset: 0;
    mask-image: linear-gradient(to bottom, black, transparent 78%);
    pointer-events: none;
    position: fixed;
}

.glass-card {
    background: linear-gradient(145deg, rgba(255,255,255,0.12), rgba(255,255,255,0.045));
    border: 1px solid rgba(255,255,255,0.16);
    border-radius: 1.5rem;
    box-shadow: 0 24px 80px rgba(0,0,0,0.34), inset 0 1px 0 rgba(255,255,255,0.08);
    backdrop-filter: blur(18px);
    overflow-wrap: anywhere;
}

.neon-border {
    position: relative;
}

.neon-border::after {
    border: 1px solid rgba(57, 255, 136, 0.38);
    border-radius: inherit;
    box-shadow: 0 0 30px rgba(57, 255, 136, 0.16), inset 0 0 24px rgba(57, 255, 136, 0.06);
    content: "";
    inset: 0;
    pointer-events: none;
    position: absolute;
}

.danger-border::after {
    border-color: rgba(255, 49, 90, 0.55);
    box-shadow: 0 0 34px rgba(255, 49, 90, 0.2), inset 0 0 24px rgba(255, 49, 90, 0.08);
}

.glow-button,
.danger-button,
.ghost-button,
.option-button {
    align-items: center;
    border-radius: 999px;
    display: inline-flex;
    font-weight: 900;
    justify-content: center;
    line-height: 1.2;
    min-height: 3.25rem;
    padding: 0.85rem 1.25rem;
    text-align: center;
    transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease, filter 180ms ease;
    user-select: none;
}

.glow-button {
    background: var(--neon-green);
    box-shadow: 0 0 30px rgba(57, 255, 136, 0.32);
    color: #06120b;
}

.danger-button {
    animation: pulseDanger 1.35s infinite;
    background: linear-gradient(135deg, #ff315a, #9f1239);
    box-shadow: 0 0 34px rgba(255, 49, 90, 0.42);
    color: white;
}

.ghost-button,
.option-button {
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.16);
    color: white;
}

.glow-button:hover,
.danger-button:hover,
.ghost-button:hover,
.option-button:hover {
    transform: translateY(-2px) scale(1.02);
}

.glow-button:active,
.danger-button:active,
.ghost-button:active,
.option-button:active {
    transform: translateY(0) scale(0.99);
}

.glow-button:focus-visible,
.danger-button:focus-visible,
.ghost-button:focus-visible,
.option-button:focus-visible,
.nav-link:focus-visible,
.premium-input:focus-visible {
    outline: 3px solid rgba(57,255,136,0.45);
    outline-offset: 3px;
}

.option-button {
    border-radius: 1rem;
    justify-content: flex-start;
    min-height: 4rem;
    text-align: left;
    width: 100%;
}

.option-button.selected,
.option-button:focus {
    border-color: var(--neon-green);
    box-shadow: 0 0 24px rgba(57, 255, 136, 0.22);
    outline: none;
}

.nav-link {
    border-radius: 999px;
    color: rgb(203 213 225);
    padding: 0.6rem 0.9rem;
    transition: background 180ms ease, color 180ms ease;
}

.nav-link:hover {
    background: rgba(255,255,255,0.08);
    color: white;
}

.premium-input {
    background: rgba(0,0,0,0.34);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 1rem;
    color: white;
    font-size: 16px;
    font-weight: 800;
    min-height: 3.5rem;
    outline: none;
    padding: 1rem;
    transition: border-color 180ms ease, box-shadow 180ms ease, background 180ms ease;
    width: 100%;
}

.premium-input:focus {
    background: rgba(0,0,0,0.48);
    border-color: var(--neon-green);
    box-shadow: 0 0 28px rgba(57,255,136,0.2);
}

.mini-stat,
.feature-card,
.leaderboard-card {
    background: linear-gradient(145deg, rgba(255,255,255,0.1), rgba(255,255,255,0.045));
    border: 1px solid rgba(255,255,255,0.14);
    border-radius: 1.25rem;
    box-shadow: 0 18px 60px rgba(0,0,0,0.22);
}

.mini-stat {
    padding: 1rem;
}

.mini-stat span {
    color: rgb(148 163 184);
    display: block;
    font-size: 0.8rem;
    font-weight: 900;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.mini-stat strong {
    color: var(--neon-green);
    display: block;
    font-size: 1.25rem;
    margin-top: 0.2rem;
}

.mini-stat.danger strong {
    color: var(--neon-red);
}

.mini-stat.snake strong {
    color: var(--neon-purple);
}

.feature-card,
.leaderboard-card,
.chain-card,
.timeline-item {
    padding: 1.25rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 900;
    margin-top: 0.75rem;
}

.feature-card p:last-child {
    color: rgb(148 163 184);
    line-height: 1.65;
    margin-top: 0.45rem;
}

.countdown-pill {
    align-items: center;
    background: rgba(255,49,90,0.12);
    border: 1px solid rgba(255,49,90,0.38);
    border-radius: 999px;
    box-shadow: 0 0 24px rgba(255,49,90,0.16);
    color: var(--neon-red);
    display: inline-flex;
    font-size: 1rem;
    font-weight: 900;
    min-height: 2.5rem;
    padding: 0.5rem 0.9rem;
}

.chain-card {
    background: linear-gradient(145deg, rgba(57,255,136,0.09), rgba(255,255,255,0.045));
    border: 1px solid rgba(255,255,255,0.14);
    border-radius: 1.25rem;
    box-shadow: 0 18px 60px rgba(0,0,0,0.22);
    padding: 1rem;
}

.stat-chip {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 1rem;
    padding: 0.75rem;
}

.stat-chip span {
    color: rgb(148 163 184);
    font-size: 0.75rem;
    font-weight: 900;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.stat-chip strong {
    color: white;
    font-size: 0.9rem;
}

.stat-track {
    background: rgba(255,255,255,0.09);
    border-radius: 999px;
    height: 0.5rem;
    margin-top: 0.55rem;
    overflow: hidden;
}

.stat-track i {
    background: var(--neon-green);
    border-radius: inherit;
    display: block;
    height: 100%;
}

.stat-chip.mid .stat-track i {
    background: var(--neon-blue);
}

.stat-chip.bad .stat-track i {
    background: var(--neon-red);
}

.timeline-item {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 1.15rem;
}

.timeline-item span {
    color: var(--neon-green);
    display: block;
    font-size: 0.8rem;
    font-weight: 900;
    letter-spacing: 0.08em;
    margin-bottom: 0.35rem;
    text-transform: uppercase;
}

.timeline-item p {
    color: rgb(226 232 240);
    line-height: 1.65;
}

.choice-card.selected {
    background: rgba(57,255,136,0.12);
}

.delta-card {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 1rem;
    color: rgb(203 213 225);
    font-size: 0.78rem;
    font-weight: 900;
    letter-spacing: 0.08em;
    padding: 1rem;
    text-transform: uppercase;
}

.delta-card strong {
    display: block;
    font-size: 1.5rem;
    letter-spacing: 0;
    margin-top: 0.25rem;
}

.delta-card.good strong {
    color: var(--neon-green);
}

.delta-card.bad strong {
    color: var(--neon-red);
}

.player-chip,
.score-row {
    align-items: center;
    background: rgba(255,255,255,0.07);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 1rem;
    display: grid;
    gap: 0.2rem;
    padding: 0.85rem 1rem;
}

.player-chip {
    grid-template-columns: 1fr auto;
}

.player-chip span,
.score-row span {
    color: white;
    font-weight: 900;
}

.player-chip strong,
.score-row strong {
    color: var(--neon-green);
    font-weight: 900;
}

.score-row {
    grid-template-columns: 1fr auto;
}

.score-row small {
    color: rgb(148 163 184);
    grid-column: 1 / -1;
}

@media (max-width: 420px) {
    .score-row,
    .player-chip {
        grid-template-columns: 1fr;
    }
}

.status-pill {
    border: 1px solid rgba(255,255,255,0.14);
    border-radius: 999px;
    color: rgb(203 213 225);
    display: inline-flex;
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    padding: 0.45rem 0.75rem;
    text-transform: uppercase;
}

.blink-warning {
    animation: blinkWarning 1s infinite alternate;
}

.digital-glitch {
    animation: glitch 0.7s linear infinite;
    text-shadow: 2px 0 var(--neon-red), -2px 0 var(--neon-blue);
}

.screen-shake {
    animation: shake 0.55s linear;
}

.red-flash {
    animation: redFlash 0.85s ease;
}

.shield-glow {
    animation: shieldGlow 0.95s ease;
}

.snake-run {
    animation: snakeRun 1.1s ease-in-out infinite alternate;
    display: inline-block;
}

.certificate-canvas {
    aspect-ratio: 1 / 1;
    background: #050816;
    border-radius: 1.25rem;
    box-shadow: 0 0 40px rgba(57,255,136,0.18);
    max-width: 100%;
    width: 540px;
}

.join-actions {
    padding-bottom: max(0.25rem, var(--safe-bottom));
}

.leaderboard-table {
    border-collapse: separate;
    border-spacing: 0 0.75rem;
    width: 100%;
}

.leaderboard-table tr {
    background: rgba(255,255,255,0.07);
}

.leaderboard-table td,
.leaderboard-table th {
    padding: 0.9rem;
}

.leaderboard-table tr td:first-child,
.leaderboard-table tr th:first-child {
    border-radius: 1rem 0 0 1rem;
}

.leaderboard-table tr td:last-child,
.leaderboard-table tr th:last-child {
    border-radius: 0 1rem 1rem 0;
}

@media (max-width: 640px) {
    body {
        background:
            radial-gradient(circle at top left, rgba(57, 255, 136, 0.13), transparent 22rem),
            radial-gradient(circle at top right, rgba(255, 49, 90, 0.12), transparent 20rem),
            var(--void);
    }

    .site-shell::before {
        background-size: 28px 28px;
    }

    .glass-card {
        border-radius: 1.25rem;
    }

    .hero-grid {
        gap: 1.5rem;
    }

    .glow-button,
    .danger-button,
    .ghost-button,
    .option-button {
        min-height: 3.45rem;
        padding: 0.9rem 1rem;
        width: 100%;
    }

    .status-pill {
        letter-spacing: 0.05em;
        line-height: 1.25;
        white-space: normal;
    }

    .certificate-canvas {
        width: min(100%, 420px);
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 0.001ms !important;
    }
}

@keyframes pulseDanger {
    0%, 100% { filter: brightness(1); transform: scale(1); }
    50% { filter: brightness(1.24); transform: scale(1.025); }
}

@keyframes blinkWarning {
    from { opacity: 0.64; }
    to { opacity: 1; text-shadow: 0 0 22px rgba(255,49,90,0.8); }
}

@keyframes glitch {
    0%, 100% { transform: translate(0); }
    20% { transform: translate(-2px, 1px); }
    40% { transform: translate(2px, -1px); }
    60% { transform: translate(-1px, -1px); }
    80% { transform: translate(1px, 1px); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-8px); }
    40% { transform: translateX(8px); }
    60% { transform: translateX(-6px); }
    80% { transform: translateX(6px); }
}

@keyframes redFlash {
    0%, 100% { box-shadow: none; }
    45% { box-shadow: inset 0 0 0 9999px rgba(255,49,90,0.22); }
}

@keyframes shieldGlow {
    0% { box-shadow: 0 0 0 rgba(57,255,136,0); }
    50% { box-shadow: 0 0 80px rgba(57,255,136,0.5); }
    100% { box-shadow: 0 0 0 rgba(57,255,136,0); }
}

@keyframes snakeRun {
    from { transform: translateX(-8px) rotate(-5deg); }
    to { transform: translateX(8px) rotate(5deg); }
}