/* ==========================================================================
   房贷计算器工具站 - 全站共用样式
   主色 #1E6F5C | 移动优先 | 响应式
   ========================================================================== */

:root {
  --primary: #1E6F5C;
  --primary-dark: #175846;
  --primary-light: #2c8a74;
  --primary-soft: #e6f2ee;
  --bg: #f4f6f5;
  --card-bg: #ffffff;
  --text: #1f2937;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --danger: #d9534f;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.05), 0 10px 28px rgba(0, 0, 0, 0.06);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1 0 auto;
  width: 100%;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--primary-light);
}

.container {
  width: 100%;
  max-width: 1040px;
  margin: 0 auto;
  padding-left: 16px;
  padding-right: 16px;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 12px;
  padding-bottom: 12px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  white-space: nowrap;
}

.logo:hover {
  color: var(--primary-light);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.site-nav a {
  color: var(--text);
  font-size: 0.9rem;
  padding: 6px 10px;
  border-radius: 8px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.site-nav a:hover {
  background-color: var(--primary-soft);
  color: var(--primary);
}

/* ---------- 面包屑 / 返回首页 ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  font-size: 0.9rem;
  color: var(--text-muted);
  padding-top: 16px;
  padding-bottom: 4px;
}

.breadcrumb a {
  color: var(--primary);
  font-weight: 500;
}

.breadcrumb .sep {
  color: var(--border);
}

/* ---------- 广告位 ---------- */
.ad-slot {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 90px;
  margin: 16px 0;
  padding: 16px;
  background-color: var(--card-bg);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: 0.85rem;
  text-align: center;
  letter-spacing: 1px;
}

/* ---------- Hero ---------- */
.hero {
  text-align: center;
  padding-top: 40px;
  padding-bottom: 24px;
}

.hero h1 {
  font-size: 1.9rem;
  line-height: 1.3;
  color: var(--primary);
  margin-bottom: 12px;
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto;
}

/* ---------- 区块标题 ---------- */
.section-title {
  font-size: 1.35rem;
  text-align: center;
  margin-bottom: 20px;
  color: var(--text);
}

/* ---------- 工具卡片网格 ---------- */
.tools-section {
  padding-top: 8px;
  padding-bottom: 48px;
}

.tool-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.tool-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px;
  background-color: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  color: var(--text);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.tool-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08), 0 16px 36px rgba(30, 111, 92, 0.12);
  border-color: var(--primary-light);
  color: var(--text);
}

.tool-icon {
  font-size: 2rem;
  line-height: 1;
}

.tool-card h3 {
  font-size: 1.15rem;
  color: var(--primary);
}

.tool-card p {
  font-size: 0.92rem;
  color: var(--text-muted);
}

.tool-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  margin-top: 4px;
}

/* ---------- 页面头部（工具页） ---------- */
.page-head {
  padding-top: 20px;
  padding-bottom: 8px;
}

.page-head h1 {
  font-size: 1.7rem;
  color: var(--primary);
  margin-bottom: 8px;
}

.page-head p {
  color: var(--text-muted);
  font-size: 1rem;
}

/* ---------- 卡片 ---------- */
.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
  margin: 16px 0;
}

/* ---------- 表单 ---------- */
.calculator-form .form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 8px;
  color: var(--text);
}

.form-group .hint {
  display: block;
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--text-muted);
}

.form-control {
  width: 100%;
  padding: 12px 14px;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background-color: #fff;
  color: var(--text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(30, 111, 92, 0.15);
}

.form-control::placeholder {
  color: #9ca3af;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 14px 26px;
  font-size: 1.05rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.1s ease, box-shadow 0.2s ease;
  line-height: 1.2;
}

.btn:active {
  transform: scale(0.98);
}

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

.btn-primary:hover {
  background-color: var(--primary-light);
  box-shadow: 0 4px 12px rgba(30, 111, 92, 0.3);
}

.btn-outline {
  background-color: #fff;
  color: var(--primary);
  border: 1px solid var(--primary);
}

.btn-outline:hover {
  background-color: var(--primary-soft);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

/* ---------- 结果展示 ---------- */
.result-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 16px 0 20px;
}

.result-item {
  background-color: var(--primary-soft);
  border-radius: var(--radius-sm);
  padding: 16px;
  text-align: center;
}

.result-item span {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.result-item strong {
  display: block;
  font-size: 1.5rem;
  color: var(--primary);
  font-weight: 700;
  word-break: break-all;
}

.result-item.highlight {
  background-color: var(--primary);
}

.result-item.highlight span {
  color: rgba(255, 255, 255, 0.85);
}

.result-item.highlight strong {
  color: #fff;
}

.result-note {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

/* ---------- FAQ ---------- */
.faq-item {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-item h3 {
  font-size: 1rem;
  color: var(--text);
  margin-bottom: 6px;
}

.faq-item p {
  font-size: 0.92rem;
  color: var(--text-muted);
}

/* ---------- 相关工具推荐 ---------- */
.related {
  margin: 8px 0 32px;
}

.related h2 {
  font-size: 1.3rem;
  color: var(--text);
  margin-bottom: 16px;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background-color: #eef2f0;
  border-top: 1px solid var(--border);
  margin-top: 32px;
  flex-shrink: 0;
}

.site-footer .container {
  padding-top: 32px;
  padding-bottom: 24px;
}

.footer-about,
.footer-faq {
  margin-bottom: 24px;
}

.footer-about h2,
.footer-faq h2 {
  font-size: 1.15rem;
  color: var(--primary);
  margin-bottom: 12px;
}

.footer-about p,
.footer-faq .faq-item p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-disclaimer {
  margin-top: 8px;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.footer-copy {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  padding-top: 16px;
  margin-top: 8px;
}

/* ---------- 响应式：平板及以上 ---------- */
@media (min-width: 640px) {
  .container {
    padding-left: 24px;
    padding-right: 24px;
  }

  .hero h1 {
    font-size: 2.4rem;
  }

  .tool-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .result-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-head h1 {
    font-size: 2rem;
  }
}

@media (min-width: 900px) {
  .tool-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .card {
    padding: 28px;
  }
}