:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #172033;
  --muted: #667085;
  --line: #e6eaf2;
  --primary: #1b66ff;
  --primary-dark: #124fd1;
  --danger: #c0392b;
  --shadow: 0 10px 30px rgba(23, 32, 51, 0.08);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-size: 18px;
  line-height: 1.5;
}
.app-shell { max-width: 900px; margin: 0 auto; padding: 18px; }
.topbar { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 18px; }
h1 { margin: 0; font-size: 30px; }
h2 { margin: 0 0 12px; font-size: 24px; }
h3 { margin: 0 0 12px; font-size: 21px; }
.muted { color: var(--muted); margin: 4px 0 0; }
.hidden { display: none !important; }

.nav-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}
.nav-card {
  border: 0;
  background: var(--card);
  border-radius: 20px;
  padding: 22px;
  min-height: 140px;
  text-align: left;
  box-shadow: var(--shadow);
  cursor: pointer;
  color: var(--text);
}
.nav-card strong { display: block; font-size: 24px; margin: 8px 0; }
.nav-card small { color: var(--muted); font-size: 15px; }
.nav-icon { font-size: 34px; display: block; }

.card, .notice, .news-item, .market-item, .trade-item {
  background: var(--card);
  border-radius: 18px;
  padding: 18px;
  box-shadow: var(--shadow);
  margin-bottom: 14px;
}
.notice { border-left: 6px solid var(--primary); box-shadow: none; }
.page { display: none; }
.page.active { display: block; }
.page-head { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }

.summary-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.summary-grid div { background: #f0f4ff; border-radius: 14px; padding: 16px; text-align: center; }
.summary-grid span { display: block; font-size: 24px; font-weight: 700; }
.summary-grid small { color: var(--muted); }

button, .secondary-btn, .primary-btn, .ghost-btn, .back-btn, .file-btn {
  font: inherit;
  border-radius: 14px;
  border: none;
  padding: 12px 16px;
  cursor: pointer;
  min-height: 48px;
}
.primary-btn { background: var(--primary); color: white; }
.primary-btn:hover { background: var(--primary-dark); }
.secondary-btn, .back-btn { background: #eaf0ff; color: var(--text); display: inline-block; }
.ghost-btn { background: transparent; color: var(--primary); }
.danger-btn { background: #fff1f0; color: var(--danger); }
.row { display: flex; align-items: center; }
.between { justify-content: space-between; }
.gap { gap: 10px; }
.wrap { flex-wrap: wrap; }

.input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  font-size: 18px;
  background: white;
  margin-top: 6px;
}
label { display: block; color: var(--text); margin-bottom: 12px; }
.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.file-btn input { display: none; }

.news-item h3, .market-item h3, .trade-item h3 { margin-bottom: 8px; }
.meta { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0; }
.badge { display: inline-block; background: #eef2ff; color: #1d3a8a; padding: 4px 10px; border-radius: 999px; font-size: 14px; }
.news-link { color: var(--primary); text-decoration: none; font-weight: 600; }
.market-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; margin: 10px 0; }
.market-grid div { background: #f7f9fc; border-radius: 12px; padding: 10px; }
.market-grid small { display: block; color: var(--muted); }

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.modal-card {
  width: min(860px, 100%);
  max-height: 90vh;
  overflow: auto;
  background: var(--card);
  border-radius: 20px;
  padding: 18px;
  box-shadow: var(--shadow);
}
.answer-box {
  white-space: pre-wrap;
  word-break: break-word;
  background: #f7f9fc;
  border-radius: 14px;
  padding: 14px;
  min-height: 120px;
  font-size: 17px;
}
.loading { color: var(--primary); margin-bottom: 12px; }

@media (max-width: 650px) {
  body { font-size: 17px; }
  .app-shell { padding: 12px; }
  h1 { font-size: 26px; }
  .nav-grid, .summary-grid, .form-grid, .market-grid { grid-template-columns: 1fr; }
  .nav-card { min-height: 118px; }
  .nav-card strong { font-size: 23px; }
  .topbar { align-items: flex-start; }
}