:root {
  --bg: #0a0e17;
  --panel: #131a29;
  --panel-2: #1a2338;
  --border: #262f45;
  --text: #e7ebf5;
  --muted: #7c8598;
  --up: #35d07f;
  --down: #ff5c5c;
  --accent: #f2c14e;
  --interactive: #5b8def;
  --font-body: "Pretendard", -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.accent { color: var(--accent); }
.hidden { display: none !important; }
.up { color: var(--up); }
.down { color: var(--down); }

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 20px 96px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.15em;
  color: var(--interactive);
  margin: 0 0 8px;
}

h1 {
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.2;
  margin: 0 0 16px;
  font-weight: 700;
}

.title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.title-row h1 { margin-bottom: 0; }
.ranking-link {
  text-decoration: none;
  white-space: nowrap;
  margin-bottom: 16px;
}

.lede {
  color: var(--muted);
  line-height: 1.6;
  margin: 0 0 32px;
  font-size: 15px;
}

.field-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 32px;
}
.field-row .field { margin-bottom: 0; }
.field span {
  font-size: 13px;
  color: var(--muted);
}
.field input,
.field select {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  color: var(--text);
  font-size: 16px;
  font-family: var(--font-body);
}
.field select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: calc(100% - 18px) center, calc(100% - 13px) center;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}
.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--interactive);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.invest-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
}
.invest-card.risk-high { border-left: 3px solid var(--down); }
.invest-card.risk-mid { border-left: 3px solid var(--accent); }
.invest-card.risk-low { border-left: 3px solid var(--up); }

.card-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 14px;
}
.card-name { font-weight: 600; font-size: 15px; }
.card-tag { font-size: 12px; color: var(--muted); }

.slider {
  width: 100%;
  appearance: none;
  height: 4px;
  border-radius: 2px;
  background: var(--border);
  margin: 8px 0;
}
.slider::-webkit-slider-thumb {
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--interactive);
  cursor: pointer;
  border: 2px solid var(--bg);
}
.slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--interactive);
  cursor: pointer;
  border: 2px solid var(--bg);
}

.card-foot {
  display: flex;
  justify-content: flex-end;
  margin-top: 6px;
}
.card-foot .amount { font-size: 15px; }

.ledger {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
  margin-bottom: 20px;
}
.ledger-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  font-size: 14px;
  color: var(--muted);
}
.ledger-row.highlight { color: var(--text); font-weight: 600; }
.ledger-row.highlight span:last-child { color: var(--accent); }
.ledger-row.big { font-size: 20px; padding: 10px 0; }
#finalRate.up { color: var(--up); }
#finalRate.down { color: var(--down); }

.error {
  color: var(--down);
  font-size: 13px;
  min-height: 18px;
  margin: 0 0 12px;
}

.btn-primary {
  width: 100%;
  background: var(--interactive);
  color: #06101f;
  border: none;
  border-radius: 10px;
  padding: 16px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  font-family: var(--font-body);
  transition: opacity 0.15s ease, transform 0.1s ease;
}
.btn-primary:hover:not(:disabled) { opacity: 0.9; }
.btn-primary:active:not(:disabled) { transform: scale(0.99); }
.btn-primary:disabled {
  background: var(--border);
  color: var(--muted);
  cursor: not-allowed;
}

/* Result screen */
.result-grid .invest-card { border-left-width: 3px; }
.invest-card.result.up { border-left-color: var(--up); }
.invest-card.result.down { border-left-color: var(--down); }
.invest-card.result .rate { font-weight: 700; }
.invest-card.result.up .rate { color: var(--up); }
.invest-card.result.down .rate { color: var(--down); }

.rank-banner,
.diversify-banner {
  border-radius: 10px;
  padding: 16px 18px;
  font-size: 14px;
  line-height: 1.6;
  margin-top: 14px;
  border: 1px solid var(--border);
}
.rank-banner.pass {
  background: rgba(53, 208, 127, 0.1);
  border-color: var(--up);
  color: var(--up);
  font-weight: 600;
}
.rank-banner.neutral {
  background: var(--panel-2);
  border-color: var(--border);
  color: var(--text);
  font-weight: 600;
}
.diversify-banner {
  background: var(--panel-2);
  color: var(--muted);
}

.next-btn {
  margin-top: 28px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
}
.next-btn:hover { background: var(--panel-2); color: var(--text); }

.btn-danger {
  background: transparent;
  color: var(--down);
  border: 1px solid var(--down);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font-body);
}
.btn-danger:hover { background: rgba(255, 92, 92, 0.08); }

.btn-ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font-body);
}
.btn-ghost:hover { background: var(--panel-2); color: var(--text); }

.row-actions { display: flex; gap: 6px; }
tr.hidden-row { opacity: 0.45; }

/* Public ranking page */
.ranking-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.rank-row {
  display: grid;
  grid-template-columns: 56px 1fr auto;
  align-items: center;
  gap: 12px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
}
.rank-num { font-size: 15px; color: var(--muted); }
.rank-student { font-size: 15px; }
.rank-rate { font-size: 16px; font-weight: 700; }
.rank-row.medal-1 { border-color: #f2c14e; background: rgba(242, 193, 78, 0.08); }
.rank-row.medal-2 { border-color: #c9d2e0; background: rgba(201, 210, 224, 0.06); }
.rank-row.medal-3 { border-color: #d18a52; background: rgba(209, 138, 82, 0.07); }
.rank-row.medal-1 .rank-num,
.rank-row.medal-2 .rank-num,
.rank-row.medal-3 .rank-num { font-size: 20px; }

/* Admin page */
.admin-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 28px;
}
.stat-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}
.stat-card .stat-label { font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.stat-card .stat-value { font-size: 22px; font-weight: 700; }

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 10px;
}
table.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 640px;
}
table.results-table th,
table.results-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
table.results-table th {
  background: var(--panel-2);
  color: var(--muted);
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  position: sticky;
  top: 0;
}
table.results-table th .arrow {
  font-family: var(--font-mono);
  color: var(--interactive);
  margin-left: 4px;
}
table.results-table tbody tr:hover { background: var(--panel-2); }
table.results-table td.mono { font-family: var(--font-mono); }
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
}
.badge.pass { background: rgba(53, 208, 127, 0.15); color: var(--up); }
.badge.fail { background: rgba(255, 92, 92, 0.12); color: var(--down); }

.admin-login {
  max-width: 360px;
  margin: 96px auto;
  text-align: center;
}
.admin-login .field { text-align: left; }

:focus-visible {
  outline: 2px solid var(--interactive);
  outline-offset: 2px;
}