:root {
    --snu-navy: #003876;
    --snu-navy-deep: #002450;
    --gold: #f4c430;
    --gold-soft: #fff4cf;
    --gold-border: #e6b800;
    --ink: #1c2530;
    --muted: #6b7684;
    --line: #e6eaf0;
    --bg: #f4f6fa;
    --card: #ffffff;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
}

body {
    font-family: "Segoe UI", "Helvetica Neue", "Apple SD Gothic Neo",
        "Malgun Gothic", sans-serif;
    color: var(--ink);
    background-color: var(--bg);
    /* Subtle FastMRI feel: faint k-space grid lines, nothing loud. */
    background-image:
        radial-gradient(circle at 15% 20%, rgba(0, 56, 118, 0.05), transparent 40%),
        radial-gradient(circle at 85% 80%, rgba(0, 56, 118, 0.05), transparent 40%),
        linear-gradient(rgba(0, 56, 118, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 56, 118, 0.035) 1px, transparent 1px);
    background-size: 100% 100%, 100% 100%, 28px 28px, 28px 28px;
    min-height: 100vh;
}

.wrap {
    max-width: 920px;
    margin: 0 auto;
    padding: 32px 20px 60px;
}

/* ---------- Header ---------- */
.header {
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 22px 26px;
    background: linear-gradient(135deg, var(--snu-navy), var(--snu-navy-deep));
    border-radius: 16px;
    color: #fff;
    box-shadow: 0 8px 24px rgba(0, 36, 80, 0.18);
}

.header .logo {
    width: 60px;
    height: 60px;
    flex: 0 0 auto;
    background: #fff;
    border-radius: 12px;
    padding: 6px;
    object-fit: contain;
}

.header h1 {
    margin: 0;
    font-size: 22px;
    letter-spacing: 0.2px;
}

.header .sub {
    margin: 4px 0 0;
    font-size: 13px;
    color: #b9cbe4;
    letter-spacing: 1px;
    text-transform: uppercase;
}

/* ---------- Nav ---------- */
.nav {
    display: flex;
    gap: 10px;
    margin: 20px 0 18px;
}

.nav a {
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    color: var(--snu-navy);
    padding: 9px 16px;
    border-radius: 10px;
    border: 1px solid var(--line);
    background: var(--card);
    transition: all 0.15s ease;
}

.nav a:hover {
    border-color: var(--snu-navy);
}

.nav a.active {
    background: var(--snu-navy);
    color: #fff;
    border-color: var(--snu-navy);
}

/* ---------- Card ---------- */
.card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 8px 8px;
    box-shadow: 0 4px 16px rgba(28, 37, 48, 0.05);
    overflow: hidden;
}

/* ---------- Table ---------- */
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 15px;
}

thead th {
    text-align: right;
    font-size: 12px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--muted);
    padding: 14px 16px;
    border-bottom: 2px solid var(--line);
    white-space: nowrap;
}

thead th.left {
    text-align: left;
}

tbody td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--line);
    text-align: right;
    font-variant-numeric: tabular-nums;
}

tbody tr:last-child td {
    border-bottom: none;
}

td.rank {
    text-align: center;
    font-weight: 700;
    width: 64px;
    color: var(--snu-navy);
}

td.team {
    text-align: left;
    font-weight: 600;
}

td.avg {
    font-weight: 700;
    color: var(--snu-navy);
}

td.updated {
    color: var(--muted);
    font-size: 12px;
    white-space: nowrap;
}

/* Top 1-5 highlighted gold; the rest stay neutral. */
tr.top td {
    background: var(--gold-soft);
}

tr.top td.rank {
    color: var(--gold-border);
}

tr.top:first-child td {
    background: linear-gradient(90deg, var(--gold-soft), #fffaea);
}

.medal {
    font-size: 15px;
}

.empty {
    text-align: center;
    color: var(--muted);
    padding: 40px 16px;
}

.foot-note {
    margin-top: 14px;
    font-size: 12px;
    color: var(--muted);
    text-align: center;
}

.live {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--muted);
    margin-left: auto;
}

.live .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #2ecc71;
    animation: pulse 1.6s infinite;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.3; }
    100% { opacity: 1; }
}

.bar {
    display: flex;
    align-items: center;
    margin: 20px 0 12px;
}

.bar h2 {
    margin: 0;
    font-size: 17px;
    color: var(--ink);
}

/* ---------- Form ---------- */
.form-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 26px;
    box-shadow: 0 4px 16px rgba(28, 37, 48, 0.05);
    max-width: 520px;
}

.field {
    margin-bottom: 18px;
}

.field label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 7px;
}

.field .hint {
    font-weight: 400;
    color: var(--muted);
    font-size: 12px;
}

.field input {
    width: 100%;
    padding: 11px 13px;
    font-size: 15px;
    border: 1px solid var(--line);
    border-radius: 10px;
    outline: none;
    transition: border-color 0.15s ease;
}

.field input:focus {
    border-color: var(--snu-navy);
}

.row2 {
    display: flex;
    gap: 14px;
}

.row2 .field {
    flex: 1;
}

button.submit {
    width: 100%;
    padding: 13px;
    font-size: 15px;
    font-weight: 700;
    color: #fff;
    background: var(--snu-navy);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: background 0.15s ease;
}

button.submit:hover {
    background: var(--snu-navy-deep);
}

button.submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.msg {
    margin-top: 16px;
    padding: 12px 14px;
    border-radius: 10px;
    font-size: 14px;
    display: none;
}

.msg.show {
    display: block;
}

.msg.ok {
    background: #e7f7ec;
    color: #1e7a3c;
    border: 1px solid #bde5c8;
}

.msg.err {
    background: #fdecec;
    color: #b02a2a;
    border: 1px solid #f3c2c2;
}

.notice {
    font-size: 12px;
    color: var(--muted);
    line-height: 1.6;
    margin-top: 18px;
}