:root {
    --bg: #05060f;
    --panel: #111936;
    --line: #4d67a8;
    --text: #eef3ff;
    --muted: #9cb0df;
    --cyan: #62ecff;
    --magenta: #ff6bcf;
    --amber: #ffd982;
    --good: #95ffc3;
    --bad: #ff8ea8;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 1rem;
    color: var(--text);
    font-family: "Inter", "Segoe UI", system-ui, sans-serif;
    background:
        radial-gradient(circle at 14% 12%, rgba(98, 236, 255, 0.22), transparent 42%),
        radial-gradient(circle at 84% 8%, rgba(255, 107, 207, 0.22), transparent 46%),
        linear-gradient(165deg, #05060e 0%, #0b1431 52%, #06060d 100%);
}

.app {
    width: min(980px, 100%);
    display: grid;
    gap: 0.85rem;
}

.panel {
    border: 1px solid var(--line);
    border-radius: 14px;
    background: linear-gradient(180deg, rgba(20, 32, 69, 0.97), rgba(9, 14, 28, 0.97));
    box-shadow: 0 14px 30px rgba(0, 0, 0, 0.35);
}

.topbar {
    padding: 0.95rem 1rem;
}

.back {
    color: var(--amber);
    font-weight: 700;
    text-decoration: none;
}

h1 {
    margin: 0.5rem 0 0.3rem;
    font-size: clamp(1.45rem, 3.3vw, 2.1rem);
}

.topbar p {
    margin: 0;
    color: var(--muted);
}

.stats {
    padding: 0.75rem;
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 0.48rem;
}

.stats > div {
    border: 1px solid #556db0;
    border-radius: 10px;
    background: rgba(16, 28, 62, 0.78);
    padding: 0.42rem 0.54rem;
}

.k {
    display: block;
    text-transform: uppercase;
    font-size: 0.69rem;
    letter-spacing: 0.08em;
    color: var(--muted);
}

.stats strong {
    font-size: 1.04rem;
}

.stage {
    padding: 0.8rem;
    display: grid;
    gap: 0.72rem;
}

.stage-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.8rem;
}

.label {
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.7rem;
}

h2 {
    margin: 0.2rem 0 0;
    font-size: clamp(1.05rem, 2.5vw, 1.35rem);
}

.legend {
    display: grid;
    gap: 0.3rem;
    font-size: 0.82rem;
    color: var(--muted);
}

.chip {
    display: inline-grid;
    place-items: center;
    width: 1.3rem;
    height: 1.3rem;
    border-radius: 6px;
    font-style: normal;
    font-weight: 800;
    margin-right: 0.25rem;
    border: 1px solid rgba(255, 255, 255, 0.25);
}

.walk {
    background: linear-gradient(180deg, #42f2ff, #1a96df);
    color: #041426;
}

.stand {
    background: linear-gradient(180deg, #ffc36d, #d67b21);
    color: #231204;
}

.board {
    position: relative;
    height: 460px;
    border: 1px solid #4f69b0;
    border-radius: 12px;
    overflow: hidden;
    background:
        linear-gradient(90deg, rgba(45, 71, 138, 0.65) 0 49%, rgba(14, 22, 46, 0.92) 49% 51%, rgba(36, 60, 123, 0.7) 51% 100%),
        linear-gradient(180deg, #0c1431 0%, #121f47 100%);
}

.board::before {
    content: "";
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(
        180deg,
        rgba(198, 214, 255, 0.17) 0 8px,
        rgba(83, 112, 186, 0.1) 8px 16px,
        rgba(17, 27, 58, 0.06) 16px 24px
    );
    animation: tread 0.7s linear infinite;
    pointer-events: none;
}

.board::after {
    content: "LEFT WALK LANE                                RIGHT STAND LANE";
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 1rem);
    color: rgba(217, 231, 255, 0.75);
    font-size: 0.68rem;
    letter-spacing: 0.12em;
    text-align: center;
    z-index: 2;
    white-space: pre;
    pointer-events: none;
}

@keyframes tread {
    from { transform: translateY(0); }
    to { transform: translateY(24px); }
}

.rider {
    position: absolute;
    width: 46%;
    left: 25%;
    transform: translateX(-50%);
    border: 1px solid #6684cf;
    border-radius: 9px;
    background: linear-gradient(180deg, rgba(35, 59, 122, 0.95), rgba(20, 35, 74, 0.96));
    padding: 0.33rem 0.42rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.45rem;
    z-index: 3;
    cursor: pointer;
    user-select: none;
}

.rider[data-lane="1"] {
    left: 75%;
}

.rider[data-type="walk"] {
    border-color: rgba(98, 236, 255, 0.72);
}

.rider[data-type="stand"] {
    border-color: rgba(255, 194, 109, 0.72);
}

.rider .id {
    font-size: 0.76rem;
    color: #c8dbff;
}

.rider .meter {
    flex: 1;
    height: 0.34rem;
    border-radius: 999px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.12);
}

.rider .meter > span {
    display: block;
    height: 100%;
    width: 10%;
    background: linear-gradient(90deg, #73f3ff, #ffd37e, #ff809e);
}

.rider.hot {
    box-shadow: 0 0 16px rgba(255, 126, 153, 0.52);
}

.hint {
    margin: 0;
    color: var(--muted);
    font-size: 0.88rem;
}

.controls {
    padding: 0.8rem;
    display: grid;
    gap: 0.66rem;
}

.buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.48rem;
}

button {
    border: 1px solid #617cc8;
    border-radius: 10px;
    background: #1b3169;
    color: var(--text);
    font-weight: 700;
    padding: 0.56rem 0.84rem;
    cursor: pointer;
}

button:hover:enabled {
    border-color: #9fe4ff;
}

button:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.primary {
    background: linear-gradient(180deg, #1acaff, #136dde);
    border-color: #7de6ff;
}

.message {
    margin: 0;
    border: 1px solid #4d66a9;
    border-radius: 10px;
    min-height: 2.4rem;
    padding: 0.52rem 0.62rem;
    background: rgba(15, 24, 52, 0.78);
    color: #dbe7ff;
}

.message.good {
    color: var(--good);
}

.message.bad {
    color: var(--bad);
}

.message.warn {
    color: var(--amber);
}

@media (max-width: 900px) {
    .stats {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (max-width: 620px) {
    .stats {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .board {
        height: 420px;
    }

    .rider {
        width: 43%;
        font-size: 0.84rem;
    }

    .stage-head {
        flex-direction: column;
    }
}