:root {
    --bg: #070710;
    --panel: #111a36;
    --line: #425596;
    --text: #eaf0ff;
    --muted: #9db0e7;
    --accent: #60ecff;
    --good: #7cffab;
    --warn: #ffd36d;
    --bad: #ff7e98;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    padding: 1rem;
    display: flex;
    justify-content: center;
    color: var(--text);
    font-family: "Inter", "Segoe UI", system-ui, sans-serif;
    background:
        radial-gradient(circle at 10% 10%, rgba(96, 236, 255, 0.2), transparent 34%),
        radial-gradient(circle at 85% 15%, rgba(255, 88, 189, 0.22), transparent 38%),
        linear-gradient(165deg, #05050b 0%, #0b1230 55%, #06070f 100%);
}

.app {
    width: min(1040px, 100%);
    display: grid;
    gap: 0.85rem;
}

.panel {
    border: 1px solid var(--line);
    border-radius: 14px;
    background: linear-gradient(180deg, rgba(16, 24, 53, 0.96), rgba(8, 11, 24, 0.96));
    box-shadow: 0 14px 32px rgba(0, 0, 0, 0.35);
}

.topbar {
    padding: 0.9rem 1rem;
}

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

h1 {
    margin: 0.56rem 0 0.3rem;
    font-size: clamp(1.4rem, 3.2vw, 2.1rem);
}

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

.status-strip {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0.5rem;
    padding: 0.75rem;
}

.status-strip > div {
    border: 1px solid #4a5ca0;
    border-radius: 10px;
    padding: 0.45rem 0.56rem;
    background: rgba(19, 31, 69, 0.72);
}

.k {
    display: block;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
}

.status-strip strong {
    font-size: 1.05rem;
}

.stage {
    padding: 0.75rem;
    display: grid;
    gap: 0.5rem;
}

#bench {
    width: 100%;
    border-radius: 12px;
    border: 1px solid #5164aa;
    background: linear-gradient(180deg, #111c43, #080d20 62%, #060912);
}

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

.controls {
    padding: 0.78rem;
    display: grid;
    gap: 0.72rem;
}

.tooth-grid {
    display: grid;
    grid-template-columns: repeat(8, minmax(0, 1fr));
    gap: 0.46rem;
}

.tooth {
    border: 1px solid #485da3;
    border-radius: 10px;
    padding: 0.45rem 0.38rem;
    background: #111d45;
    display: grid;
    gap: 0.32rem;
    justify-items: center;
}

.tooth .idx {
    font-size: 0.7rem;
    color: var(--muted);
    letter-spacing: 0.05em;
}

.tooth .value {
    font-weight: 800;
    color: #f8fbff;
    min-width: 1.5rem;
    text-align: center;
}

.tooth button {
    width: 100%;
    border: 1px solid #5b73c6;
    border-radius: 8px;
    background: #1b2f69;
    color: var(--text);
    padding: 0.34rem 0;
    cursor: pointer;
    font-weight: 700;
}

.tooth button:hover {
    border-color: #8fd6ff;
}

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

.actions button {
    border: 1px solid #566fc0;
    border-radius: 10px;
    background: #1a2d63;
    color: var(--text);
    padding: 0.56rem 0.78rem;
    cursor: pointer;
    font-weight: 700;
}

.actions button:hover {
    border-color: #90d9ff;
}

.actions .primary {
    background: linear-gradient(180deg, #00b7ff, #0d6adb);
    border-color: #76ddff;
}

.message {
    margin: 0;
    border: 1px solid #495d9f;
    border-radius: 10px;
    padding: 0.52rem 0.62rem;
    background: rgba(16, 26, 58, 0.72);
    color: #d6e0ff;
    min-height: 2.4rem;
}

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

@media (max-width: 860px) {
    .status-strip {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .tooth-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
}