/* ==========================================================================
   八大官股行庫買賣動向 — 樣式
   預設：淺色主題；可透過右上角切換鈕改為深色（設定會存在瀏覽器中）。
   字體：Helvetica Neue（西文/數字），中文字自動 fallback 到系統中文字型。
   全站文字最小 13px。
   ========================================================================== */

:root {
  /* ---- 淺色主題（預設） ---- */
  --bg: #f4f6fb;
  --bg-soft: #ffffff;
  --card: #ffffff;
  --border: #dde3ee;
  --text: #1a2233;
  --text-dim: #5b6478;
  --accent: #2f6fed;
  --accent-contrast: #ffffff;
  --up: #d92d20;    /* 台股慣例：紅漲 / 買超 */
  --down: #16874f;  /* 台股慣例：綠跌 / 賣超 */
  --shadow: 0 1px 2px rgba(20, 30, 60, 0.06), 0 1px 1px rgba(20, 30, 60, 0.04);
  --radius: 12px;
}

:root[data-theme="dark"] {
  --bg: #0f1420;
  --bg-soft: #161d2e;
  --card: #1b2338;
  --border: #2a3550;
  --text: #e8ecf6;
  --text-dim: #8f9bbd;
  --accent: #4f8cff;
  --accent-contrast: #ffffff;
  --up: #ff4d4f;
  --down: #21c55d;
  --shadow: none;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Helvetica Neue", Helvetica, Arial,
    "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.15s ease, color 0.15s ease;
}

a { color: var(--accent); }

/* ---------------------------------------------------------------------- */
/* Header                                                                  */
/* ---------------------------------------------------------------------- */

header.top {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 18px 24px 0;
  position: sticky;
  top: 0;
  z-index: 10;
}

.top-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

header.top h1 {
  margin: 0 0 4px;
  font-size: 21px;
  letter-spacing: 0.01em;
}

header.top .subtitle {
  margin: 0 0 14px;
  color: var(--text-dim);
  font-size: 13px;
  line-height: 1.5;
}

.theme-toggle {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-soft);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  white-space: nowrap;
}

.theme-toggle:hover { border-color: var(--accent); }
.theme-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

nav.tabs {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

nav.tabs a {
  display: inline-block;
  padding: 10px 18px;
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  font-size: 14px;
}

nav.tabs a.active {
  color: var(--text);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

/* ---------------------------------------------------------------------- */
/* Layout                                                                  */
/* ---------------------------------------------------------------------- */

main {
  max-width: 1180px;
  margin: 0 auto;
  padding: 20px 24px 60px;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 18px;
  box-shadow: var(--shadow);
}

.toolbar label {
  display: block;
  color: var(--text-dim);
  font-size: 13px;
  margin: 0 0 3px 2px;
}

.toolbar select,
.toolbar input[type="date"] {
  background: var(--bg-soft);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 14px;
  font-family: inherit;
}

.toolbar .spacer { flex: 1; }

.toolbar .status {
  color: var(--text-dim);
  font-size: 13px;
}

.btn-group {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.btn-group button {
  background: var(--bg-soft);
  color: var(--text-dim);
  border: none;
  padding: 7px 14px;
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
}

.btn-group button + button { border-left: 1px solid var(--border); }

.btn-group button.active {
  background: var(--accent);
  color: var(--accent-contrast);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 18px;
  box-shadow: var(--shadow);
}

.card h2 {
  margin: 0 0 12px;
  font-size: 15px;
  color: var(--text-dim);
  font-weight: 600;
}

.chart-wrap {
  position: relative;
  height: 320px;
}

/* ---------------------------------------------------------------------- */
/* Table                                                                   */
/* ---------------------------------------------------------------------- */

#table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

thead th {
  text-align: right;
  color: var(--text-dim);
  font-weight: 600;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
}

thead th:first-child,
thead th:nth-child(2),
thead th:nth-child(3) {
  text-align: left;
}

thead th.sorted::after {
  content: " \25BE";
  color: var(--accent);
}

tbody td {
  text-align: right;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

tbody td:first-child,
tbody td:nth-child(2),
tbody td:nth-child(3) {
  text-align: left;
}

tbody tr:hover { background: var(--bg-soft); }

.stock-id { color: var(--text-dim); font-variant-numeric: tabular-nums; }
.stock-name { font-weight: 600; }

.num-up { color: var(--up); font-variant-numeric: tabular-nums; }
.num-down { color: var(--down); font-variant-numeric: tabular-nums; }
.num-flat { color: var(--text-dim); font-variant-numeric: tabular-nums; }

.pill {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 13px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--text-dim);
}

.bank-row {
  display: none;
  background: var(--bg-soft);
}

.bank-row.open { display: table-row; }

.bank-detail {
  padding: 10px 14px !important;
  text-align: left !important;
}

.bank-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.bank-chip {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 13px;
}

.bank-chip .bank-name { color: var(--text-dim); margin-right: 6px; }

.expand-btn {
  cursor: pointer;
  color: var(--accent);
  font-size: 13px;
  font-family: inherit;
  background: none;
  border: none;
  padding: 0;
}

.empty-state {
  text-align: center;
  color: var(--text-dim);
  padding: 40px 0;
  font-size: 14px;
}

.footnote {
  color: var(--text-dim);
  font-size: 13px;
  margin-top: 8px;
  line-height: 1.6;
}

/* ---------------------------------------------------------------------- */
/* Responsive — 平板 (<=1024px)                                            */
/* ---------------------------------------------------------------------- */

@media (max-width: 1024px) {
  main {
    max-width: 100%;
    padding: 18px 20px 50px;
  }

  .chart-wrap { height: 280px; }

  header.top { padding: 16px 20px 0; }
}

/* ---------------------------------------------------------------------- */
/* Responsive — 手機 (<=640px)                                             */
/* ---------------------------------------------------------------------- */

@media (max-width: 640px) {
  header.top { padding: 14px 16px 0; }

  .top-row { flex-wrap: wrap; }

  header.top h1 { font-size: 18px; }

  header.top .subtitle { font-size: 13px; }

  .theme-toggle { padding: 6px 12px; font-size: 13px; }

  nav.tabs a { padding: 9px 12px; font-size: 13px; }

  main { padding: 14px 12px 40px; }

  .toolbar {
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
  }

  .toolbar > div { width: 100%; }

  .toolbar select,
  .toolbar input[type="date"] {
    width: 100%;
  }

  .toolbar .spacer { display: none; }

  .toolbar .status { text-align: left; }

  .btn-group { width: 100%; }
  .btn-group button { flex: 1; }

  .card { padding: 12px; }

  .card h2 { font-size: 14px; }

  .chart-wrap { height: 220px; }

  table { font-size: 13px; }

  thead th, tbody td { padding: 7px 8px; }

  .footnote { font-size: 13px; }
}