:root {
  --bg: #f5f6fa;
  --card: #ffffff;
  --text: #1f2430;
  --muted: #6b7280;
  --border: #e5e7eb;
  --up: #ef4444;      /* 涨（红） */
  --down: #10b981;    /* 跌（绿） */
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.header {
  background: linear-gradient(135deg, #1e293b, #334155);
  color: #fff;
  padding: 24px 28px;
  text-align: center;
}
.header h1 { font-size: 22px; font-weight: 700; }
.header p { font-size: 13px; opacity: .8; margin-top: 4px; }
.update-time { font-size: 12px; opacity: .7; margin-top: 8px; }

.main { max-width: 900px; margin: 0 auto; padding: 20px; }

/* 价格卡片 */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  cursor: pointer;
  transition: all .15s;
  box-shadow: 0 1px 3px rgba(16,24,40,.06);
}
.card:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(16,24,40,.1); }
.card.selected { border-color: #6366f1; box-shadow: 0 0 0 2px rgba(99,102,241,.15); }
.card-name { font-size: 13px; color: var(--muted); }
.card-price { font-size: 28px; font-weight: 800; margin: 6px 0; }
.card-change { font-size: 13px; display: flex; gap: 10px; font-weight: 600; }
.card.up .card-price, .card.up .card-change { color: var(--up); }
.card.down .card-price, .card.down .card-change { color: var(--down); }
.card.flat .card-price { color: var(--text); }
.card.flat .card-change { color: var(--muted); }

/* 图表 */
.chart-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  box-shadow: 0 1px 3px rgba(16,24,40,.06);
}
.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 8px;
}
.tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.tab {
  border: 1px solid var(--border);
  background: #fff;
  padding: 6px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text);
}
.tab.active { background: #4f46e5; color: #fff; border-color: #4f46e5; font-weight: 600; }
.range {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 13px;
  background: #fff;
  color: var(--text);
}
.chart { width: 100%; height: 360px; }
.chart-hint { font-size: 12px; color: var(--muted); text-align: center; margin-top: 6px; }

.footer {
  text-align: center;
  padding: 16px;
  color: var(--muted);
  font-size: 12px;
}

/* 控制区（日期选择 + 清除按钮） */
.controls { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

/* 每日汇总表格 */
.daily-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  margin-top: 20px;
  box-shadow: 0 1px 3px rgba(16,24,40,.06);
}
.daily-title { font-size: 16px; margin-bottom: 12px; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 10px 12px; text-align: right; white-space: nowrap; }
th { color: var(--muted); font-weight: 600; border-bottom: 1px solid var(--border); font-size: 13px; }
td { border-bottom: 1px solid #f1f2f6; }
th:first-child, td:first-child { text-align: left; }
td.hi { color: var(--up); }
td.lo { color: var(--down); }
td.up { color: var(--up); }
td.down { color: var(--down); }
td.flat { color: var(--muted); }
.empty { text-align: center; color: var(--muted); }

/* 按钮 */
.btn {
  border: none; border-radius: 10px; padding: 9px 16px;
  font-size: 14px; cursor: pointer; font-weight: 600; transition: all .15s;
}
.btn-primary { background: #4f46e5; color: #fff; }
.btn-primary:hover { background: #4338ca; }
.btn-ghost { background: #fff; color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: #4f46e5; color: #4f46e5; }

/* 价格预警 */
.alert-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  margin-top: 20px;
  box-shadow: 0 1px 3px rgba(16,24,40,.06);
}
.alert-title { font-size: 16px; margin-bottom: 4px; }
.alert-hint { font-size: 13px; color: var(--muted); margin-bottom: 14px; }
.alert-row {
  display: grid;
  grid-template-columns: 100px 1fr 1fr;
  gap: 10px;
  align-items: center;
  margin-bottom: 10px;
}
.alert-name { font-size: 14px; font-weight: 600; }
.alert-input {
  border: 1px solid var(--border); border-radius: 8px;
  padding: 8px 12px; font-size: 14px; width: 100%;
}
.alert-input:focus { outline: 2px solid #4f46e5; border-color: transparent; }
.alert-log {
  margin-top: 12px; padding: 12px 14px; border-radius: 10px;
  background: #eef2ff; color: #3730a3; font-size: 14px;
}

/* 每日汇总标题行 */
.daily-head {
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 10px; margin-bottom: 12px;
}
.daily-head .daily-title { margin-bottom: 0; }