/* frontend/styles.css */
:root, [data-theme="light"] {
  --bg: #fff;
  --surface: #f6f8fa;
  --surface-hover: #eef1f4;
  --border: #d0d7de;
  --text: #24292f;
  --text-secondary: #57606a;
  --accent: #0969da;
  --accent-hover: #0550ae;
  --success: #1a7f37;
  --warning: #bf8700;
  --danger: #cf222e;
  --gold: #e3b341;
  --silver: #8b949e;
  --bronze: #da7b39;
  --shadow: #1f232814;
}

[data-theme="dark"] {
  --bg: #0d1117;
  --surface: #161b22;
  --surface-hover: #1c2128;
  --border: #30363d;
  --text: #e6edf3;
  --text-secondary: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --success: #3fb950;
  --warning: #d29922;
  --danger: #f85149;
  --gold: #e3b341;
  --silver: #8b949e;
  --bronze: #da7b39;
  --shadow: #0000004d;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

.container {
  max-width: 1600px;
  margin: 0 auto;
  padding: 16px 24px;
}

.header {
  display: flex;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  justify-content: space-between;
  align-items:  center;
  gap: 12px;
  margin-bottom: 16px;
  padding: 12px 0;
}

.header-left {
  display: flex;
  align-items:  center;
  gap: 16px;
}

.header h1 {
  font-size: 20px;
  font-weight: 600;
}

.header-right {
  display: flex;
  align-items:  center;
  gap: 12px;
}

.sync-info {
  color: var(--text-secondary);
  font-size: 12px;
}

.btn {
  display: inline-flex;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  border-radius: 6px;
  align-items:  center;
  gap: 6px;
  padding: 6px 14px;
  transition: background .15s, border-color .15s;
  font-size: 13px;
  font-weight: 500;
}

.btn:hover {
  background: var(--surface-hover);
  border-color: var(--text-secondary);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn:disabled {
  opacity: .5;
  cursor: not-allowed;
}

select {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 13px;
}

.tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  gap: 4px;
  margin-bottom: 16px;
  padding-bottom: 0;
}

.tab {
  color: var(--text-secondary);
  cursor: pointer;
  background: none;
  border: none;
  border-bottom: 2px solid #0000;
  padding: 8px 16px;
  transition: color .15s, border-color .15s;
  font-size: 13px;
  font-weight: 500;
}

.tab:hover {
  color: var(--text);
}

.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
}

table {
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
  width: 100%;
  font-size: 13px;
}

thead {
  position: sticky;
  z-index: 1;
  top: 0;
}

th {
  background: var(--surface);
  text-align: right;
  color: var(--text-secondary);
  white-space: nowrap;
  border-bottom: 1px solid var(--border);
  padding: 10px 12px;
  font-size: 12px;
  font-weight: 600;
}

th:first-child {
  text-align: left;
  position: sticky;
  z-index: 2;
  left: 0;
}

td {
  text-align: right;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  padding: 8px 12px;
}

td:first-child {
  text-align: left;
  position: sticky;
  background: var(--bg);
  z-index: 1;
  font-weight: 500;
  left: 0;
}

tr:hover td, tr:hover td:first-child {
  background: var(--surface-hover);
}

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

.rank {
  display: inline-flex;
  border-radius: 50%;
  justify-content: center;
  align-items:  center;
  width: 24px;
  height: 24px;
  margin-right: 4px;
  font-size: 11px;
  font-weight: 700;
}

.rank-1 {
  background: var(--gold);
  color: #000;
}

.rank-2 {
  background: var(--silver);
  color: #000;
}

.rank-3 {
  background: var(--bronze);
  color: #fff;
}

.num-good {
  color: var(--success);
}

.num-bad {
  color: var(--danger);
}

.num-na {
  color: var(--text-secondary);
  font-style: italic;
}

.exchange-name {
  display: flex;
  align-items:  center;
  gap: 6px;
}

.exchange-highlight {
  color: var(--accent);
  font-weight: 600;
}

.loading {
  display: flex;
  color: var(--text-secondary);
  justify-content: center;
  align-items:  center;
  padding: 80px 0;
  font-size: 14px;
}

.spinner {
  display: inline-block;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  animation: spin .8s linear infinite;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  margin-right: 8px;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.error-banner {
  background: var(--surface);
  border: 1px solid var(--danger);
  color: var(--danger);
  border-radius: 6px;
  margin-bottom: 16px;
  padding: 12px 16px;
  font-size: 13px;
}

.section-title {
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: .5px;
  margin: 20px 0 8px;
  font-size: 14px;
  font-weight: 600;
}

@media (max-width: 768px) {
  .container {
    padding: 12px 16px;
  }

  .header {
    flex-direction: column;
    align-items:  flex-start;
  }
}