/* ========================================================================
   Finance Tools — Global Styles
   设计目标: 干净、可读性高、移动端优先、预留广告位。
   ======================================================================== */
:root {
  --color-bg: #ffffff;
  --color-surface: #f8fafc;
  --color-surface-2: #eef2f7;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-primary: #10b981;
  --color-primary-dark: #059669;
  --color-accent: #2563eb;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --maxw: 920px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f172a;
    --color-surface: #1e293b;
    --color-surface-2: #273449;
    --color-text: #f1f5f9;
    --color-text-muted: #94a3b8;
    --color-border: #334155;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  font-size: 16px;
}

a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Layout ---------- */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 16px; }
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  position: sticky; top: 0; z-index: 10;
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { font-weight: 700; font-size: 1.15rem; color: var(--color-text); display: flex; align-items: center; gap: 8px; }
.brand .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--color-primary); }
nav a { margin-left: 16px; color: var(--color-text-muted); font-size: 0.92rem; }
nav a:hover { color: var(--color-text); }

.hero { padding: 40px 0 24px; text-align: center; }
.hero h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); margin: 0 0 12px; }
.hero p { color: var(--color-text-muted); max-width: 560px; margin: 0 auto; }

main { padding: 24px 0 60px; }

/* ---------- Cards ---------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}
.card h2 { margin: 0 0 8px; font-size: 1.25rem; }
.card p { margin: 0; color: var(--color-text-muted); }

/* ---------- Tool grid (home) ---------- */
.tool-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin-top: 24px; }
.tool-card {
  display: block;
  padding: 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  color: var(--color-text);
}
.tool-card:hover { text-decoration: none; transform: translateY(-2px); box-shadow: var(--shadow); border-color: var(--color-primary); }
.tool-card .icon { font-size: 1.6rem; margin-bottom: 8px; }
.tool-card h3 { margin: 0 0 6px; font-size: 1.1rem; }
.tool-card p { margin: 0; color: var(--color-text-muted); font-size: 0.9rem; }

/* ---------- Calculator page ---------- */
.calc-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 720px) { .calc-wrap { grid-template-columns: 1fr; } }

.calc-form label { display: block; margin-bottom: 14px; }
.calc-form .label-text { display: block; font-size: 0.85rem; color: var(--color-text-muted); margin-bottom: 4px; }
.calc-form input[type="number"],
.calc-form input[type="text"],
.calc-form select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 1rem;
  font-family: inherit;
}
.calc-form input:focus, .calc-form select:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
  border-color: transparent;
}
.radio-row { display: flex; gap: 14px; margin-top: 4px; }
.radio-row label { margin: 0; }

.calc-results { display: flex; flex-direction: column; gap: 12px; }
.result-label { margin: 0; font-size: 0.85rem; font-weight: 600; color: var(--color-text-muted); }
.result-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px 16px;
}
.result-card span { display: block; font-size: 0.82rem; color: var(--color-text-muted); }
.result-card strong { display: block; font-size: 1.45rem; font-weight: 700; color: var(--color-primary-dark); margin-top: 2px; }

/* ---------- Schedule table ---------- */
.schedule { width: 100%; border-collapse: collapse; margin-top: 16px; font-size: 0.9rem; }
.schedule th, .schedule td { padding: 8px 10px; border-bottom: 1px solid var(--color-border); text-align: right; }
.schedule th { background: var(--color-surface-2); font-weight: 600; font-size: 0.82rem; color: var(--color-text-muted); text-align: right; }
.schedule th:first-child, .schedule td:first-child { text-align: left; }
.schedule tr:last-child td { border-bottom: none; }
.schedule .last-row td { border-top: 2px solid var(--color-border); font-weight: 600; }
.toggle-btn { margin-top: 12px; padding: 8px 14px; border: 1px solid var(--color-border); background: var(--color-surface); color: var(--color-text); border-radius: var(--radius-sm); cursor: pointer; font-size: 0.88rem; }
.toggle-btn:hover { background: var(--color-surface-2); }

/* ---------- Ad slots ---------- */
/* 未通过广告审核前默认隐藏：空广告位会降低站点观感与审核印象。
   审核通过后，删除下面这行 display:none，或直接把占位替换为真实广告代码。 */
.ad-slot {
  display: none;
  background: var(--color-surface-2);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  text-align: center;
  padding: 20px;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  margin: 24px 0;
}
.ad-slot::before { content: "Ad Slot"; display: block; font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-text-muted); opacity: 0.6; margin-bottom: 4px; }

/* ---------- Article / content ---------- */
.article { max-width: 760px; }
.article h2 { margin-top: 32px; font-size: 1.3rem; }
.article h3 { margin-top: 24px; font-size: 1.1rem; }
.article p { margin: 12px 0; }
.article ul { padding-left: 20px; }
.article code { background: var(--color-surface-2); padding: 1px 6px; border-radius: 4px; font-size: 0.9em; }

.disclaimer {
  margin-top: 24px;
  padding: 14px 16px;
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: var(--radius);
  font-size: 0.86rem;
  color: #92400e;
}
@media (prefers-color-scheme: dark) {
  .disclaimer { background: #1e293b; border-color: #334155; color: var(--color-text-muted); }
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 24px 0;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}
.site-footer .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.site-footer a { color: var(--color-text-muted); }