:root {
    color-scheme: dark;
    --bg: #0b1220;
    --panel: #121a2b;
    --text: #e8eefc;
    --muted: #9fb0d0;
    --accent: #38bdf8;
    --good: #34d399;
    --warn: #fbbf24;
    --bad: #f87171;
    font-family: "Pretendard", "Segoe UI", sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: radial-gradient(circle at top, #15213b, var(--bg));
    color: var(--text);
    min-height: 100vh;
}

#app {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem 1.25rem 4rem;
}

.hero h1 {
    margin: 0.25rem 0 0.5rem;
    font-size: 2rem;
}

.eyebrow,
.meta {
    color: var(--muted);
    margin: 0.2rem 0;
}

.panel {
    background: var(--panel);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 14px;
    padding: 1.25rem;
    margin-top: 1rem;
}

.grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    padding: 1rem;
    position: relative;
}

.card-rank {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    color: var(--accent);
    font-weight: 700;
}

.code {
    color: var(--muted);
    font-size: 0.9rem;
}

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

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    text-align: left;
    padding: 0.5rem 0.35rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.empty {
    color: var(--muted);
}

.error {
    border-color: var(--bad);
}

.quality strong {
    color: var(--accent);
}

.schedule {
    color: var(--accent);
}

.hint {
    color: var(--muted);
    font-size: 0.92rem;
    margin-top: 0;
}

.panel.highlight {
    border-color: rgba(245, 158, 11, 0.45);
}