:root {
  --bg: #f4f5f7;
  --card-bg: #ffffff;
  --text: #1d2129;
  --muted: #86909c;
  --border: #e5e6eb;
  --up: #d9363e;    /* 放量：红 */
  --down: #00994d;  /* 缩量：绿 */
  --primary: #165dff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar h1 {
  font-size: 18px;
  margin: 0;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px;
}

.card {
  background: var(--card-bg);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

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

.btn {
  border: none;
  border-radius: 6px;
  padding: 8px 14px;
  font-size: 14px;
  cursor: pointer;
}

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

.btn-danger {
  background: #fff1f0;
  color: var(--up);
  border: 1px solid #ffccc7;
  padding: 4px 10px;
  font-size: 12px;
}

.table-scroll {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  min-width: 560px;
}

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

th {
  color: var(--muted);
  font-weight: 500;
}

tr:hover td {
  background: #fafafa;
}

.overall-row td {
  background: #f2f6ff;
  font-weight: 600;
}

.overall-row:hover td {
  background: #e8f0ff;
}

.diff-up { color: var(--up); font-weight: 600; }
.diff-down { color: var(--down); font-weight: 600; }
.diff-na { color: var(--muted); }

.chart-toolbar {
  margin-bottom: 10px;
  font-size: 13px;
}

#symbol-select {
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
}

.chart-wrap {
  position: relative;
  width: 100%;
}

.add-form {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.add-form input {
  flex: 1;
  min-width: 180px;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
}

.add-form select {
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
}

.msg {
  font-size: 13px;
  margin-bottom: 10px;
  min-height: 18px;
}

.msg.error { color: var(--up); }
.msg.success { color: var(--down); }

footer {
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  padding: 20px;
}

@media (max-width: 600px) {
  .topbar h1 { font-size: 16px; }
  main { padding: 8px; }
  .card { padding: 12px; }
}