/* ============================================
   复利计算器 - cic4.cc.cd 全站样式
   轻量、清爽、响应式，无外部依赖
   ============================================ */
:root {
  --primary: #0e7a5f;
  --primary-dark: #0a5c48;
  --primary-light: #e6f4ef;
  --accent: #f0a500;
  --text: #1f2d3a;
  --text-light: #5e6d7c;
  --bg: #f7f9fa;
  --card: #ffffff;
  --border: #e3e9ee;
  --danger: #c0392b;
  --radius: 12px;
  --shadow: 0 2px 12px rgba(15, 45, 70, 0.07);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }

/* ---------- 顶部导航 ---------- */
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}
.nav-wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  flex-wrap: wrap;
}
.logo {
  font-weight: 700;
  font-size: 20px;
  color: var(--primary-dark);
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo .logo-icon {
  width: 30px; height: 30px;
  background: var(--primary);
  color: #fff;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}
.main-nav { display: flex; gap: 4px; align-items: center; flex-wrap: wrap; }
.main-nav a {
  color: var(--text);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 15px;
}
.main-nav a:hover { background: var(--primary-light); color: var(--primary-dark); text-decoration: none; }
.main-nav a.active { background: var(--primary-light); color: var(--primary-dark); font-weight: 600; }
.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--text);
  cursor: pointer;
  padding: 6px 10px;
}

/* ---------- 页面主体 ---------- */
.page-wrap { max-width: 1100px; margin: 0 auto; padding: 28px 20px 60px; }
.page-hero {
  text-align: center;
  padding: 40px 16px 28px;
}
.page-hero h1 { font-size: 30px; color: var(--primary-dark); margin-bottom: 12px; }
.page-hero p { color: var(--text-light); max-width: 680px; margin: 0 auto; }
.breadcrumb {
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 16px;
}
.breadcrumb a { color: var(--text-light); }

/* ---------- 卡片 ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 24px;
}
.card h2 { font-size: 22px; margin-bottom: 14px; color: var(--primary-dark); }
.card h3 { font-size: 18px; margin: 18px 0 10px; color: var(--text); }

/* ---------- 计算器表单 ---------- */
.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}
.form-item label {
  display: block;
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 6px;
  font-weight: 500;
}
.form-item input, .form-item select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  background: #fff;
  color: var(--text);
  transition: border-color .2s;
}
.form-item input:focus, .form-item select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(14,122,95,0.12);
}
.btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 12px 32px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s;
}
.btn:hover { background: var(--primary-dark); }
.btn-light {
  background: var(--primary-light);
  color: var(--primary-dark);
}
.btn-light:hover { background: #d3ece2; }

/* ---------- 结果展示 ---------- */
.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin: 20px 0;
}
.result-box {
  background: var(--primary-light);
  border-radius: 10px;
  padding: 16px;
  text-align: center;
}
.result-box .r-label { font-size: 13px; color: var(--text-light); }
.result-box .r-value { font-size: 24px; font-weight: 700; color: var(--primary-dark); margin-top: 4px; }
.result-box .r-sub { font-size: 12px; color: var(--text-light); margin-top: 2px; }
.result-box.highlight { background: #fdf3dc; }
.result-box.highlight .r-value { color: #9c6b00; }

/* ---------- 图表 ---------- */
.chart-box { width: 100%; overflow-x: auto; margin: 18px 0; }
.chart-box svg { width: 100%; height: auto; min-width: 480px; display: block; }
.chart-legend { display: flex; gap: 20px; justify-content: center; font-size: 13px; color: var(--text-light); margin-bottom: 6px; flex-wrap: wrap; }
.chart-legend span { display: inline-flex; align-items: center; gap: 6px; }
.chart-legend i { width: 14px; height: 3px; display: inline-block; border-radius: 2px; }

/* ---------- 明细表 ---------- */
.table-scroll { overflow-x: auto; }
table.detail-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 560px;
}
.detail-table th, .detail-table td {
  padding: 9px 12px;
  text-align: right;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.detail-table th:first-child, .detail-table td:first-child { text-align: left; }
.detail-table th {
  background: var(--primary-light);
  color: var(--primary-dark);
  font-weight: 600;
}
.detail-table tr:hover td { background: #fafcfd; }

/* ---------- 免责声明 ---------- */
.disclaimer {
  background: #fff8e6;
  border: 1px solid #f2dfa8;
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 13px;
  color: #7a5c00;
  margin-top: 18px;
}

/* ---------- 广告位 ---------- */
.ad-slot {
  background: #f4f6f8;
  border: 1px dashed #cdd7de;
  border-radius: 10px;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #9aa8b3;
  font-size: 13px;
  margin: 24px 0;
  text-align: center;
  padding: 10px;
}
.ad-slot::before { content: "广告"; }
.ad-slot .ad-note { margin-left: 6px; }
.ad-slot.ad-rect { min-height: 250px; }
.ad-slot.ad-hr { margin: 32px 0; }

/* ---------- 布局：工具页双栏 ---------- */
.layout-2col {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 24px;
  align-items: start;
}
.layout-2col .main-col { min-width: 0; }
.layout-2col .side-col { min-width: 0; }
@media (max-width: 900px) {
  .layout-2col { grid-template-columns: 1fr; }
}

/* ---------- 首页工具卡片 ---------- */
.tool-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin: 28px 0;
}
.tool-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
  transition: transform .2s, box-shadow .2s;
  display: block;
  color: var(--text);
}
.tool-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(15,45,70,0.12);
  text-decoration: none;
}
.tool-card .tc-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: var(--primary-light);
  color: var(--primary-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 14px;
}
.tool-card h3 { margin-bottom: 8px; font-size: 18px; }
.tool-card p { font-size: 14px; color: var(--text-light); }

/* ---------- 首页特点区 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin: 20px 0;
}
.feature-item {
  text-align: center;
  padding: 20px 14px;
}
.feature-item .f-icon { font-size: 32px; margin-bottom: 10px; }
.feature-item h3 { font-size: 16px; margin-bottom: 6px; }
.feature-item p { font-size: 14px; color: var(--text-light); }

/* ---------- 文章页 ---------- */
.article-body { font-size: 16px; }
.article-body h2 { font-size: 21px; margin: 26px 0 12px; color: var(--primary-dark); }
.article-body h3 { font-size: 18px; margin: 20px 0 10px; }
.article-body p { margin-bottom: 14px; }
.article-body ul, .article-body ol { margin: 0 0 14px 22px; }
.article-body li { margin-bottom: 6px; }
.article-body blockquote {
  border-left: 4px solid var(--primary);
  background: var(--primary-light);
  padding: 12px 16px;
  border-radius: 0 8px 8px 0;
  margin: 14px 0;
  color: var(--primary-dark);
}
.formula-box {
  background: #f4f7f9;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  text-align: center;
  font-family: "Cambria Math", Georgia, serif;
  font-size: 19px;
  margin: 14px 0;
  overflow-x: auto;
}
.article-meta { font-size: 13px; color: var(--text-light); margin-bottom: 18px; }
.article-toc {
  background: #f9fbfc;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 18px;
  margin-bottom: 22px;
  font-size: 14px;
}
.article-toc strong { display: block; margin-bottom: 6px; }

/* ---------- 侧边栏 ---------- */
.side-widget {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}
.side-widget h3 { font-size: 16px; margin-bottom: 12px; color: var(--primary-dark); }
.side-widget ul { list-style: none; }
.side-widget li { padding: 6px 0; border-bottom: 1px dashed var(--border); font-size: 14px; }
.side-widget li:last-child { border-bottom: none; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: #10231c;
  color: #b9cdc5;
  padding: 40px 0 24px;
  margin-top: 40px;
  font-size: 14px;
}
.footer-wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 28px;
}
.footer-wrap h4 { color: #fff; font-size: 15px; margin-bottom: 12px; }
.footer-wrap a { color: #b9cdc5; display: block; padding: 3px 0; }
.footer-wrap a:hover { color: #fff; }
.footer-bottom {
  max-width: 1100px;
  margin: 28px auto 0;
  padding: 16px 20px 0;
  border-top: 1px solid #23423a;
  text-align: center;
  font-size: 13px;
  color: #8aa39a;
}
@media (max-width: 800px) {
  .footer-wrap { grid-template-columns: 1fr 1fr; }
}

/* ---------- 联系表单 ---------- */
.contact-form { max-width: 620px; }
.contact-form .form-item { margin-bottom: 16px; }
.contact-form textarea {
  width: 100%;
  min-height: 130px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  resize: vertical;
}
.contact-form textarea:focus { outline: none; border-color: var(--primary); }

/* ---------- 提示 ---------- */
.notice {
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 14px;
  margin: 12px 0;
}
.notice.info { background: var(--primary-light); color: var(--primary-dark); }

/* ---------- 移动端 ---------- */
@media (max-width: 768px) {
  .page-hero h1 { font-size: 24px; }
  .card { padding: 18px; }
  .result-box .r-value { font-size: 20px; }
  .nav-toggle { display: block; }
  .main-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    padding: 8px 0 12px;
    gap: 2px;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 10px 12px; }
}

/* ============================================
   多语言（i18n）：语言切换器 / RTL / 字体
   ============================================ */

/* ---------- 语言切换器 ---------- */
.site-header .main-nav { margin-left: auto; }
.lang-switch { position: relative; margin-left: 8px; flex-shrink: 0; }
.lang-switch > summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  color: var(--text);
  background: #fff;
  white-space: nowrap;
}
.lang-switch > summary::-webkit-details-marker { display: none; }
.lang-switch > summary::marker { content: ""; }
.lang-switch > summary:hover { background: var(--primary-light); color: var(--primary-dark); border-color: var(--primary-light); }
.lang-switch[open] > summary { background: var(--primary-light); color: var(--primary-dark); border-color: var(--primary-light); }
.lang-switch ul {
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  min-width: 190px;
  max-height: 62vh;
  overflow-y: auto;
  margin: 0;
  padding: 6px;
  list-style: none;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 6px 24px rgba(15, 45, 70, 0.14);
  z-index: 300;
}
.lang-switch ul li { margin: 0; }
.lang-switch ul li a {
  display: block;
  padding: 7px 10px;
  border-radius: 6px;
  font-size: 14px;
  color: var(--text);
  white-space: nowrap;
}
.lang-switch ul li a:hover { background: var(--primary-light); color: var(--primary-dark); text-decoration: none; }
.lang-switch ul li a.active { background: var(--primary-light); color: var(--primary-dark); font-weight: 700; }

/* 文章目录卡上的“仅中文”标签 */
.lang-tag {
  display: inline-block;
  margin-top: 8px;
  padding: 2px 9px;
  font-size: 12px;
  color: var(--text-light);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 20px;
}
.article-meta { font-size: 13px; color: var(--text-light); margin-bottom: 18px; }

/* ---------- RTL（阿拉伯语） ---------- */
html[dir="rtl"] body { direction: rtl; text-align: right; }
html[dir="rtl"] .lang-switch ul { right: auto; left: 0; }
html[dir="rtl"] .detail-table th,
html[dir="rtl"] .detail-table td { text-align: right; }
html[dir="rtl"] .breadcrumb { direction: rtl; }
html[dir="rtl"] .formula-box { direction: ltr; text-align: center; }

/* ---------- 多语言字体回退 ---------- */
html[lang="ja"] body { font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, "Noto Sans JP", system-ui, sans-serif; }
html[lang="ko"] body { font-family: "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", system-ui, sans-serif; }
html[lang="ar"] body { font-family: "Geeza Pro", "Noto Naskh Arabic", Tahoma, "Segoe UI", system-ui, sans-serif; }
html[lang="hi"] body { font-family: "Kohinoor Devanagari", "Noto Sans Devanagari", "Nirmala UI", system-ui, sans-serif; }
html[lang="th"] body { font-family: Thonburi, "Noto Sans Thai", "Leelawadee UI", system-ui, sans-serif; }

/* 数字与等宽对齐 */
.r-value, .detail-table td { font-variant-numeric: tabular-nums; }

@media (max-width: 768px) {
  .nav-wrap { height: auto; min-height: 60px; padding: 8px 16px; }
  .site-header .main-nav { margin-left: 0; }
  .lang-switch { margin-left: 4px; }
  .lang-switch > summary { padding: 6px 10px; font-size: 13px; }
  .lang-switch ul { min-width: 165px; max-height: 56vh; }
}