:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --good: #b91c1c;  /* 台股：賺錢／上漲＝紅色 */
  --bad: #047857;   /* 台股：賠錢／下跌＝綠色 */
  --warn: #92400e;
  --shadow: 0 10px 24px rgba(15, 23, 42, .07);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", "Microsoft JhengHei", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}

a { color: inherit; text-decoration: none; }

.site-header {
  background: #0f172a;
  color: white;
  padding: 18px 20px;
}

.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.logo {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: .02em;
}

.logo span { color: #93c5fd; }

.header-note {
  color: #cbd5e1;
  font-size: 14px;
}

.layout {
  max-width: 1120px;
  margin: 24px auto;
  padding: 0 18px;
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 22px;
}

.sidebar {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 16px;
  align-self: start;
  position: sticky;
  top: 18px;
}

.sidebar h2 {
  margin: 0 0 12px;
  font-size: 16px;
}

.nav-list { display: grid; gap: 8px; }

.nav-link {
  display: block;
  padding: 10px 12px;
  border-radius: 12px;
  color: #334155;
  background: #f8fafc;
  border: 1px solid transparent;
  font-size: 15px;
}

.nav-link:hover, .nav-link.active {
  background: #eff6ff;
  color: var(--accent-dark);
  border-color: #bfdbfe;
}

.main {
  min-width: 0;
}

.hero, .card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 26px;
  margin-bottom: 20px;
}

.hero h1, .card h1 {
  margin: 0 0 10px;
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1.25;
}

.hero p, .lead {
  color: var(--muted);
  margin: 0;
  font-size: 17px;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.tool-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  transition: transform .15s ease, border-color .15s ease;
}

.tool-card:hover {
  transform: translateY(-2px);
  border-color: #bfdbfe;
}

.tool-card h3 {
  margin: 0 0 6px;
  font-size: 18px;
}

.tool-card p {
  color: var(--muted);
  margin: 0;
  font-size: 14px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.field label {
  display: block;
  font-weight: 700;
  margin-bottom: 6px;
}

.field small {
  display: block;
  color: var(--muted);
  margin-top: 4px;
}

input, select {
  width: 100%;
  padding: 12px 12px;
  border: 1px solid #cbd5e1;
  border-radius: 12px;
  font-size: 16px;
  background: white;
}

input:focus, select:focus {
  outline: 3px solid #dbeafe;
  border-color: #60a5fa;
}

.checkbox-row {
  margin-top: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: #334155;
}

.checkbox-row input { width: auto; }

.btn-row {
  margin-top: 18px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

button {
  border: 0;
  background: var(--accent);
  color: white;
  padding: 12px 18px;
  border-radius: 12px;
  font-weight: 800;
  font-size: 16px;
  cursor: pointer;
}

button:hover { background: var(--accent-dark); }
button.secondary { background: #e2e8f0; color: #0f172a; }
button.secondary:hover { background: #cbd5e1; }

.result {
  margin-top: 20px;
  border: 1px solid #bfdbfe;
  background: #eff6ff;
  border-radius: 16px;
  padding: 18px;
  display: none;
}

.result.show { display: block; }

.result h2 {
  margin: 0 0 12px;
  font-size: 20px;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.result-item {
  background: #fff;
  border: 1px solid #dbeafe;
  border-radius: 12px;
  padding: 12px;
}

.result-label { color: var(--muted); font-size: 14px; }
.result-value { font-size: 20px; font-weight: 900; margin-top: 2px; }
.result-value.good { color: var(--good); }
.result-value.bad { color: var(--bad); }

.article h2 { margin-top: 28px; }
.article p, .article li { color: #374151; }
.article .notice {
  padding: 14px;
  border-radius: 14px;
  background: #fffbeb;
  color: var(--warn);
  border: 1px solid #fde68a;
}

.footer {
  max-width: 1120px;
  margin: 30px auto;
  padding: 0 18px 30px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 860px) {
  .header-inner { align-items: flex-start; flex-direction: column; }
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .nav-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tool-grid { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .result-grid { grid-template-columns: 1fr; }
}

.etf-row {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.etf-row:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.row-title {
  margin: 0 0 14px;
  font-size: 18px;
}

.result-subcard {
  margin-bottom: 16px;
  padding: 14px;
  border: 1px solid #dbeafe;
  border-radius: 14px;
  background: #ffffff;
}

.result-subcard h3 {
  margin: 0 0 12px;
  font-size: 18px;
}