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

:root {
  --bg: #0f0f14;
  --surface: #1a1a24;
  --surface2: #22222f;
  --border: #2e2e3e;
  --accent: #4f8ef7;
  --accent2: #7c5cfc;
  --green: #34d399;
  --red: #f87171;
  --text: #e8e8f0;
  --text2: #8888aa;
  --text3: #555570;
  --header-bg: #1e1e2e;
  --row-hover: rgba(255,255,255,0.02);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f0e8;
    --surface: #fdfaf4;
    --surface2: #ede8df;
    --border: #d9d2c5;
    --accent: #2f6de0;
    --accent2: #6236e0;
    --green: #16a34a;
    --red: #dc2626;
    --text: #1a1710;
    --text2: #6b6455;
    --text3: #a89e8e;
    --header-bg: #ede8df;
    --row-hover: rgba(0,0,0,0.03);
  }
}

html, body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overscroll-behavior-y: none;
}

#app {
  display: flex;
  flex-direction: column;
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  position: relative;
}

/* Header */
#header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 14px 16px 10px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.3px;
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

/* 页头「复制未配对」按钮（TSV 进剪贴板，粘贴到 Excel/Numbers 自动分列） */
#btn-copy-unpaired {
  flex-shrink: 0;
  border: none;
  border-radius: 8px;
  background: var(--surface2);
  color: var(--text2);
  font-size: 11px;
  font-weight: 600;
  padding: 6px 10px;
  cursor: pointer;
}
#btn-copy-unpaired:active { background: var(--accent); color: #fff; }

/* Content */
#content {
  flex: 1;
  overflow-y: auto;
  padding: 10px 12px 90px;
  -webkit-overflow-scrolling: touch;
}

.tab-page { display: none; }
.tab-page:not(.hidden) { display: block; }

/* Filter Bar */
.filter-bar {
  display: flex;
  padding: 0 0 10px;
  gap: 6px;
}
.filter-bar button {
  flex: 1;
  padding: 7px 0;
  border: none;
  border-radius: 8px;
  background: var(--surface2);
  color: var(--text2);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.filter-bar button.active {
  background: var(--accent);
  color: #fff;
}

/* Group Card */
.group-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 10px;
  overflow: hidden;
  transition: box-shadow 0.2s;
}

.group-header {
  display: grid;
  grid-template-columns: 28px auto 1fr 1fr 1fr;
  align-items: center;
  gap: 8px;
  padding: 11px 12px;
  background: var(--header-bg);
  cursor: pointer;
  user-select: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}
.group-header.open { border-color: var(--border); }

.chevron {
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text3);
  transition: transform 0.25s;
  font-size: 12px;
}
.chevron.open { transform: rotate(90deg); }

.group-symbol {
  font-family: 'SF Mono', SFMono-Regular, ui-monospace, monospace;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.5px;
  min-width: 64px;
}

/* Symbol 后的角标（未配对数 / 已配对组数） */
.unpaired-count {
  margin-left: 2ch;
  color: var(--accent);
  font-size: 12px;
}

.group-stat { text-align: right; }
.group-stat .label {
  font-size: 9px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-family: 'SF Mono', SFMono-Regular, ui-monospace, monospace;
}
.group-stat .val {
  font-size: 13px;
  font-family: 'SF Mono', SFMono-Regular, ui-monospace, monospace;
  font-weight: 500;
  color: var(--text);
  line-height: 1.2;
}
.group-stat .val.pos { color: var(--green); }
.group-stat .val.neg { color: var(--red); }

/* Group Body (collapsible) — 高度由 JS 按内容实际高度控制，不写死上限，
   否则配对/交易过多时超出部分会被 overflow 裁掉 */
.group-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

/* Trade Row */
.trade-row {
  display: grid;
  grid-template-columns: 70px 50px 70px 1fr;
  gap: 8px;
  align-items: center;
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  transition: background 0.15s;
  cursor: pointer;
}
.trade-row:last-child { border-bottom: none; }
.trade-row:hover { background: var(--row-hover); }
.trade-row.disabled {
  opacity: 0.5;
  cursor: default;
}

/* 「最近」tab：带 Symbol 列的行布局 */
.trade-row.with-symbol {
  grid-template-columns: 70px 72px 50px 70px 1fr;
}
.trade-symbol {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Subgroup 页「全部」tab：Symbol 下的二级分组（固定展开） */
.subgroup-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 12px;
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
}
.subgroup-name {
  font-size: 12px;
  font-weight: 700;
  color: var(--text2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.subgroup-stats {
  display: flex;
  gap: 12px;
  font-size: 12px;
  font-weight: 600;
  font-family: 'SF Mono', SFMono-Regular, ui-monospace, monospace;
}
.subgroup-stats .pos { color: var(--green); }
.subgroup-stats .neg { color: var(--red); }

.trade-date {
  font-size: 12px;
  color: var(--text2);
  font-family: 'SF Mono', SFMono-Regular, ui-monospace, monospace;
  white-space: nowrap;
}

.trade-cell {
  text-align: right;
  font-family: 'SF Mono', SFMono-Regular, ui-monospace, monospace;
  font-size: 13px;
  color: var(--text);
}
.trade-cell.qty { color: var(--accent); }
.trade-cell.pos { color: var(--green); }
.trade-cell.neg { color: var(--red); }

/* Pair Info on row */
.row-pair-info {
  font-size: 11px;
  font-family: 'SF Mono', SFMono-Regular, ui-monospace, monospace;
  margin-top: 1px;
}

/* Profit colors (统计 / 配对 / 子组头通用) */
.profit-pos { color: var(--green); }
.profit-neg { color: var(--red); }

/* Pair Subgroups（「已配对」筛选下的买卖子组） */
.pair-subgroup { border-bottom: 1px solid var(--border); }
.pair-subgroup:last-child { border-bottom: none; }

.pair-subgroup-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
  font-family: 'SF Mono', SFMono-Regular, ui-monospace, monospace;
  font-size: 12px;
  font-weight: 600;
}

/* 删除配对按钮：默认低调灰，悬停变红 */
.pair-delete-btn {
  background: none;
  border: none;
  color: var(--text3);
  font-size: 13px;
  font-weight: 400;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
}
.pair-delete-btn:hover {
  color: var(--red);
}

/* 子组内交易行保持正常亮度（禁用态只是不可点击） */
.pair-subgroup .trade-row.disabled { opacity: 1; }

/* Pairing View */
#pairing-view { padding: 0; }

.pairing-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  position: sticky;
  top: 0;
  z-index: 10;
}
.pairing-header h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
}
.pairing-header button {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 15px;
  cursor: pointer;
  padding: 0;
}

#base-trade {
  background: var(--surface);
  margin: 12px;
  border-radius: 12px;
  padding: 16px;
  border-left: 4px solid var(--accent);
}
.base-label {
  font-size: 11px;
  color: var(--text2);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
  font-family: 'SF Mono', SFMono-Regular, ui-monospace, monospace;
}

.candidate-section { padding: 0 12px; }
.candidate-section h4 {
  margin: 8px 0;
  font-size: 13px;
  color: var(--text2);
  font-weight: 500;
}

.candidate-card {
  background: var(--surface);
  margin-bottom: 8px;
  border-radius: 12px;
  padding: 12px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 2px solid transparent;
  cursor: pointer;
}
.candidate-card.selected {
  border-color: var(--accent);
  background: var(--surface2);
}
.candidate-card .est-profit {
  font-size: 14px;
  font-weight: 600;
  text-align: right;
}

#confirm-pair {
  display: block;
  width: calc(100% - 24px);
  margin: 16px 12px 24px;
  padding: 14px;
  border: none;
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
}
#confirm-pair:disabled {
  background: var(--text3);
  cursor: default;
}

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding: 0 0 10px;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  text-align: center;
}
.stat-value {
  font-size: 22px;
  font-weight: 700;
  margin: 4px 0;
  font-family: 'SF Mono', SFMono-Regular, ui-monospace, monospace;
}
.stat-label {
  font-size: 11px;
  color: var(--text2);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.rank-list { padding: 0; }
.rank-item {
  background: var(--surface);
  border: 1px solid var(--border);
  margin-bottom: 8px;
  border-radius: 10px;
  padding: 11px 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.rank-left {
  display: flex;
  align-items: center;
  gap: 12px;
}
.rank-num {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--surface2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  color: var(--text2);
  font-family: 'SF Mono', SFMono-Regular, ui-monospace, monospace;
}
.rank-num.top {
  background: var(--accent);
  color: #fff;
}

/* Settings */
.settings-group {
  background: var(--surface);
  border: 1px solid var(--border);
  margin-bottom: 12px;
  border-radius: 12px;
  padding: 16px;
}
.settings-group h3 {
  margin: 0 0 12px;
  font-size: 11px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  font-family: 'SF Mono', SFMono-Regular, ui-monospace, monospace;
}
.settings-group input[type="text"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  margin-bottom: 10px;
  font-family: 'SF Mono', SFMono-Regular, ui-monospace, monospace;
  background: var(--surface2);
  color: var(--text);
  outline: none;
}

/* Symbol 过滤勾选组 */
.symbol-filter {
  display: flex;
  gap: 16px;
  margin-bottom: 6px;
}
.symbol-filter label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
  font-family: 'SF Mono', SFMono-Regular, ui-monospace, monospace;
}
.symbol-filter input[type="checkbox"] {
  accent-color: var(--accent);
  cursor: pointer;
}
.symbol-filter-hint {
  font-size: 11px;
  color: var(--text3);
  margin-bottom: 10px;
  line-height: 1.5;
}
.settings-group input[type="text"]:focus { border-color: var(--accent); }

.settings-group button {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
.settings-group button.danger { background: var(--red); }
.settings-group button.secondary {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
}

/* Tab Bar */
#tab-bar {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 480px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 16px;
  height: 64px;
  z-index: 20;
}
#tab-bar button {
  flex: 1;
  padding: 8px 0 12px;
  border: none;
  background: none;
  color: var(--text2);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  transition: color 0.2s;
}
#tab-bar button.active { color: var(--accent); }

/* Empty State */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text2);
}
.empty-state-icon {
  font-size: 40px;
  margin-bottom: 12px;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0,0,0,0.85);
  color: #fff;
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 13px;
  z-index: 200;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
  white-space: nowrap;
}
.toast.show { opacity: 1; }