:root {
    color-scheme: dark;
    --bg: #07111f;
    --panel: rgba(17, 24, 39, 0.88);
    --panel-border: rgba(148, 163, 184, 0.18);
    --text: #f8fafc;
    --muted: #a8b3c7;
    --primary: #7c3aed;
    --primary-hover: #8b5cf6;
    --success: #16a34a;
    --danger: #fb7185;
    --shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

body {
    min-height: 100vh;
    margin: 0;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 15% 15%, rgba(124, 58, 237, 0.28), transparent 34rem),
        radial-gradient(circle at 85% 85%, rgba(6, 182, 212, 0.18), transparent 30rem),
        var(--bg);
}

button { font: inherit; }

.game-shell {
    width: min(980px, calc(100% - 28px));
    margin: 0 auto;
    padding: 36px 0 64px;
}

.hero {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 20px;
}

.eyebrow,
.section-kicker {
    margin: 0 0 8px;
    color: #c4b5fd;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

h1, h2, h3, p { margin-top: 0; }

h1 {
    margin-bottom: 8px;
    font-size: clamp(2.4rem, 8vw, 5rem);
    line-height: 0.95;
    letter-spacing: -0.055em;
}

h2 { margin-bottom: 10px; }

.intro {
    max-width: 700px;
    margin-bottom: 0;
    color: var(--muted);
    font-size: 1.05rem;
    line-height: 1.65;
}

.panel {
    margin-top: 16px;
    padding: clamp(20px, 4vw, 34px);
    border: 1px solid var(--panel-border);
    border-radius: 24px;
    background: var(--panel);
    box-shadow: var(--shadow);
    backdrop-filter: blur(16px);
}

.status-panel {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    padding: 18px 24px;
}

.stat {
    display: grid;
    gap: 4px;
    text-align: center;
}

.stat + .stat { border-left: 1px solid var(--panel-border); }

.stat-label {
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.stat strong { font-size: 1.35rem; }

.center-panel,
.finish-panel {
    padding-block: 58px;
    text-align: center;
}

.center-panel p,
.finish-panel p {
    max-width: 640px;
    margin-inline: auto;
    color: var(--muted);
    line-height: 1.65;
}

.button {
    min-height: 46px;
    padding: 11px 18px;
    border: 0;
    border-radius: 13px;
    color: white;
    font-weight: 800;
    cursor: pointer;
    transition: transform 160ms ease, background 160ms ease, opacity 160ms ease;
}

.button:hover:not(:disabled) { transform: translateY(-2px); }
.button:disabled { opacity: 0.55; cursor: not-allowed; }
.button-primary { background: var(--primary); }
.button-primary:hover:not(:disabled) { background: var(--primary-hover); }
.button-secondary { background: rgba(255, 255, 255, 0.1); }
.button-success { background: var(--success); }

.preview-area { text-align: center; }

.balls-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: clamp(10px, 2vw, 18px);
    min-height: 116px;
    margin: 24px 0;
}

.ball {
    position: relative;
    width: clamp(62px, 11vw, 88px);
    aspect-ratio: 1;
    flex: 0 0 auto;
    border: 4px solid rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    background:
        radial-gradient(circle at 31% 25%, rgba(255,255,255,.88) 0 6%, rgba(255,255,255,.25) 7% 18%, transparent 20%),
        var(--ball-color);
    box-shadow:
        inset -14px -16px 20px rgba(0, 0, 0, 0.25),
        0 13px 24px rgba(0, 0, 0, 0.3);
}

button.ball {
    cursor: grab;
    will-change: transform;
    transition: transform 160ms ease, box-shadow 160ms ease, outline 160ms ease;
}

button.ball:hover { transform: translateY(-5px) scale(1.03); }
button.ball:active { cursor: grabbing; }
button.ball.selected {
    outline: 5px solid white;
    outline-offset: 5px;
    transform: translateY(-7px) scale(1.04);
}
button.ball.dragging { opacity: 0.45; }
button.ball.drag-over { transform: scale(1.12); }

.ball-number {
    position: absolute;
    right: -5px;
    bottom: -5px;
    display: grid;
    width: 29px;
    height: 29px;
    place-items: center;
    border: 2px solid rgba(255,255,255,.8);
    border-radius: 50%;
    color: #111827;
    background: white;
    font-size: .8rem;
    font-weight: 900;
    box-shadow: 0 4px 10px rgba(0,0,0,.25);
}

.play-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 18px;
}

.play-heading h2 { margin-bottom: 0; }
.small-help { margin-bottom: 0; color: var(--muted); font-size: .88rem; }

.actions {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.message {
    min-height: 30px;
    margin: 24px 0 8px;
    text-align: center;
    font-size: 1.08rem;
    font-weight: 800;
}

.message.success { color: #86efac; }
.message.error { color: var(--danger); }

.history-section {
    max-width: 620px;
    margin: 28px auto 0;
}

.history-section h3 { font-size: 1rem; }
.history-list {
    display: grid;
    gap: 10px;
    padding-left: 0;
    list-style: none;
}

.history-item {
    display: grid;
    gap: 11px;
    padding: 13px 15px;
    border: 1px solid var(--panel-border);
    border-radius: 14px;
    color: var(--muted);
    background: rgba(255,255,255,.035);
    animation: history-in 260ms ease-out both;
}

.history-item.solved {
    border-color: rgba(134, 239, 172, 0.32);
    background: rgba(22, 163, 74, 0.08);
}

.history-item.latest-wrong {
    border-color: rgba(196, 181, 253, 0.36);
    box-shadow: inset 3px 0 0 #a78bfa;
}

.history-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.history-meta strong { color: var(--text); }

.history-balls {
    display: flex;
    align-items: center;
    gap: 7px;
    min-width: 0;
    overflow-x: auto;
    padding: 2px 1px 5px;
    scrollbar-width: thin;
}

.history-ball {
    width: clamp(22px, 5.5vw, 30px);
    aspect-ratio: 1;
    flex: 0 0 auto;
    border: 2px solid rgba(255, 255, 255, 0.48);
    border-radius: 50%;
    background:
        radial-gradient(circle at 31% 25%, rgba(255,255,255,.82) 0 8%, rgba(255,255,255,.22) 9% 21%, transparent 23%),
        var(--ball-color);
    box-shadow:
        inset -5px -6px 8px rgba(0, 0, 0, 0.24),
        0 4px 8px rgba(0, 0, 0, 0.22);
}

@keyframes history-in {
    from {
        opacity: 0;
        transform: translateY(-6px) scale(.985);
    }
}

.final-time {
    font-size: 1.15rem;
}

.final-time strong {
    color: var(--text);
    font-variant-numeric: tabular-nums;
}

#timerValue {
    font-variant-numeric: tabular-nums;
}

.trophy { margin-bottom: 10px; font-size: 5rem; animation: bounce 900ms ease-in-out infinite alternate; }

@keyframes bounce {
    to { transform: translateY(-10px) rotate(4deg); }
}

.shake { animation: shake 330ms ease; }
@keyframes shake {
    25% { transform: translateX(-8px); }
    50% { transform: translateX(8px); }
    75% { transform: translateX(-4px); }
}

[hidden] { display: none !important; }

@media (max-width: 700px) {
    .hero, .play-heading { align-items: stretch; flex-direction: column; }
    .hero .button { align-self: flex-start; }
    .small-help { line-height: 1.5; }
    .status-panel {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px 0;
        padding-inline: 12px;
    }
    .stat:nth-child(3) { border-left: 0; }
    .stat:nth-child(-n + 2) {
        padding-bottom: 14px;
        border-bottom: 1px solid var(--panel-border);
    }
    .panel { border-radius: 18px; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.score-entry {
    width: min(560px, 100%);
    margin: 28px auto 22px;
    padding: 20px;
    border: 1px solid rgba(134, 239, 172, 0.24);
    border-radius: 18px;
    background: rgba(22, 163, 74, 0.08);
}

.score-entry h3 {
    margin-bottom: 14px;
}

.score-form {
    display: flex;
    justify-content: center;
    gap: 10px;
}

.score-form input {
    min-width: 0;
    flex: 1 1 250px;
    min-height: 46px;
    padding: 11px 14px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 13px;
    outline: none;
    color: var(--text);
    background: rgba(7, 17, 31, 0.72);
    font: inherit;
    transition: border-color 160ms ease, box-shadow 160ms ease;
}

.score-form input:focus {
    border-color: #a78bfa;
    box-shadow: 0 0 0 4px rgba(167, 139, 250, 0.16);
}

.score-form input:disabled {
    opacity: 0.65;
}

.score-message {
    min-height: 24px;
    margin: 12px 0 0 !important;
    font-weight: 800;
}

.score-message.success { color: #86efac; }
.score-message.error { color: var(--danger); }

.leaderboard-panel {
    padding-top: 28px;
}

.leaderboard-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 22px;
}

.leaderboard-heading h2,
.leaderboard-heading p {
    margin-bottom: 0;
}

.leaderboard-heading > p {
    color: var(--muted);
    text-align: right;
}

.leaderboard-columns,
.leaderboard-item {
    display: grid;
    grid-template-columns: 72px minmax(0, 1fr) minmax(86px, auto);
    align-items: center;
    gap: 14px;
}

.leaderboard-columns {
    padding: 0 16px 8px;
    color: var(--muted);
    font-size: 0.74rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.leaderboard-columns span:last-child {
    text-align: right;
}

.leaderboard-list {
    display: grid;
    gap: 9px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.leaderboard-item {
    min-height: 64px;
    padding: 10px 16px;
    border: 1px solid var(--panel-border);
    border-radius: 15px;
    background: rgba(255, 255, 255, 0.035);
}

.leaderboard-rank {
    display: grid;
    width: 38px;
    height: 38px;
    place-items: center;
    border-radius: 50%;
    color: var(--text);
    background: rgba(255, 255, 255, 0.09);
    font-variant-numeric: tabular-nums;
}

.leaderboard-place-1 .leaderboard-rank { background: linear-gradient(145deg, #fde68a, #d97706); color: #2b1700; }
.leaderboard-place-2 .leaderboard-rank { background: linear-gradient(145deg, #f1f5f9, #94a3b8); color: #111827; }
.leaderboard-place-3 .leaderboard-rank { background: linear-gradient(145deg, #fdba74, #b45309); color: #281400; }

.leaderboard-player {
    display: grid;
    min-width: 0;
    gap: 3px;
}

.leaderboard-player strong {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.leaderboard-player small {
    color: var(--muted);
}

.leaderboard-time {
    text-align: right;
    font-size: 1.08rem;
    font-variant-numeric: tabular-nums;
}

.leaderboard-empty {
    margin: 0;
    padding: 24px 12px 8px;
    color: var(--muted);
    text-align: center;
}

@media (max-width: 700px) {
    .score-form,
    .leaderboard-heading {
        align-items: stretch;
        flex-direction: column;
    }

    .score-form .button {
        width: 100%;
    }

    .leaderboard-heading > p {
        text-align: left;
    }

    .leaderboard-columns,
    .leaderboard-item {
        grid-template-columns: 48px minmax(0, 1fr) minmax(72px, auto);
        gap: 10px;
    }

    .leaderboard-columns {
        padding-inline: 10px;
    }

    .leaderboard-item {
        padding-inline: 10px;
    }
}