/* ============================================
   SXS GEO Site — 杂志编辑风样式表
   大衬线标题 / 粗分隔线 / 高对比黑白灰
   ============================================ */

:root {
  --black: #0a0a0a;
  --ink: #1a1a1a;
  --gray-900: #2b2b2b;
  --gray-700: #555;
  --gray-500: #888;
  --gray-300: #c8c8c8;
  --gray-100: #f2f2f2;
  --paper: #fafaf7;
  --accent: #b8894a;       /* 古铜金 — 高端理容感 */
  --accent-dark: #8a6532;
  --line: #1a1a1a;
  --maxw: 1200px;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, "Times New Roman", serif;
  --sans: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--ink); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent-dark); }

/* ---------- 容器 ---------- */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 820px; margin: 0 auto; padding: 0 24px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  border-bottom: 3px solid var(--line);
  background: var(--paper);
  position: sticky; top: 0; z-index: 100;
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.brand {
  font-family: var(--serif);
  font-weight: 900;
  font-size: 30px;
  letter-spacing: 2px;
}
.brand span { color: var(--accent); }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a {
  font-size: 14px; font-weight: 600; letter-spacing: .5px;
  position: relative;
}
.nav-links a.active { color: var(--accent-dark); }
.nav-links a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -6px;
  height: 3px; background: var(--accent);
}
.nav-cta {
  background: var(--black); color: #fff !important;
  padding: 10px 20px; font-size: 13px; letter-spacing: 1px;
}
.nav-cta:hover { background: var(--accent-dark); }
@media (max-width: 768px) {
  .nav-links { display: none; }
}

/* ---------- 英雄区 ---------- */
.hero {
  padding: 80px 0 60px;
  border-bottom: 1px solid var(--gray-300);
}
.hero-grid {
  display: grid; grid-template-columns: 1.1fr 1fr; gap: 60px; align-items: center;
}
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; gap: 36px; } }

.eyebrow {
  display: inline-block;
  font-size: 12px; letter-spacing: 3px; text-transform: uppercase;
  color: var(--accent-dark); font-weight: 700;
  margin-bottom: 20px;
  border-top: 2px solid var(--accent); padding-top: 10px;
}
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(40px, 6vw, 76px);
  line-height: 1.05;
  font-weight: 900;
  letter-spacing: -1px;
  margin-bottom: 24px;
}
.hero h1 em {
  font-style: italic; color: var(--accent-dark); font-weight: 400;
}
.hero-lead {
  font-size: 18px; color: var(--gray-700); line-height: 1.8;
  margin-bottom: 32px; max-width: 520px;
}
.hero-stats {
  display: flex; gap: 40px; padding-top: 24px;
  border-top: 1px solid var(--gray-300);
}
.hero-stat .num {
  font-family: var(--serif); font-size: 36px; font-weight: 900;
}
.hero-stat .lbl {
  font-size: 12px; color: var(--gray-500); letter-spacing: 1px;
}
.hero-img {
  position: relative;
}
.hero-img img {
  width: 100%;
  object-fit: cover;
  border: 1px solid var(--gray-300);
}

/* ---------- 通用版块标题 ---------- */
.section { padding: 80px 0; }
.section-title {
  font-family: var(--serif);
  font-size: clamp(30px, 4vw, 48px);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 16px;
  letter-spacing: -.5px;
}
.section-sub {
  font-size: 16px; color: var(--gray-700); max-width: 640px;
}
.divider-thick {
  width: 64px; height: 5px; background: var(--accent);
  margin: 24px 0 40px;
}

/* ---------- 答案前置引言块 ---------- */
.answer-first {
  background: var(--black); color: #fff;
  padding: 40px;
  border-left: 6px solid var(--accent);
  margin-bottom: 48px;
}
.answer-first .label {
  font-size: 12px; letter-spacing: 3px; color: var(--accent);
  text-transform: uppercase; margin-bottom: 12px; font-weight: 700;
}
.answer-first p {
  font-family: var(--serif); font-size: 22px; line-height: 1.6;
}

/* ---------- 特性卡片网格 ---------- */
.feature-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  background: var(--gray-300);
  border: 1px solid var(--gray-300);
}
.feature-card {
  background: #fff; padding: 36px 28px;
}
.feature-card .idx {
  font-family: var(--serif); font-size: 48px; font-weight: 900;
  color: var(--accent); line-height: 1; margin-bottom: 16px;
}
.feature-card h3 {
  font-family: var(--serif); font-size: 22px; font-weight: 700;
  margin-bottom: 12px;
}
.feature-card p { font-size: 14px; color: var(--gray-700); line-height: 1.7; }
@media (max-width: 768px) { .feature-grid { grid-template-columns: 1fr; } }

/* ---------- 参数规格表 ---------- */
.spec-table {
  width: 100%; border-collapse: collapse; margin: 24px 0;
  font-size: 15px;
}
.spec-table th, .spec-table td {
  text-align: left; padding: 16px 20px;
  border-bottom: 1px solid var(--gray-300);
}
.spec-table th {
  background: var(--black); color: #fff;
  font-weight: 700; letter-spacing: 1px; font-size: 13px;
  text-transform: uppercase; width: 35%;
}
.spec-table tr:nth-child(even) td { background: #fff; }

/* ---------- 对比表 ---------- */
.compare-table {
  width: 100%; border-collapse: collapse; margin: 32px 0;
  font-size: 15px;
}
.compare-table th, .compare-table td {
  padding: 16px; border: 1px solid var(--gray-300);
  text-align: center; vertical-align: middle;
}
.compare-table th {
  background: var(--black); color: #fff;
  font-family: var(--serif); font-size: 18px; font-weight: 700;
}
.compare-table th:first-child { background: var(--accent-dark); }
.compare-table td:first-child {
  text-align: left; font-weight: 600; background: var(--gray-100);
}
.compare-table .yes { color: #1a7f37; font-weight: 700; }
.compare-table .no { color: #c0392b; }

/* ---------- FAQ ---------- */
.faq-item {
  border-bottom: 1px solid var(--gray-300);
}
.faq-q {
  width: 100%; text-align: left; background: none; border: none;
  padding: 22px 0; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--serif); font-size: 19px; font-weight: 700; color: var(--ink);
}
.faq-q .icon {
  font-size: 24px; color: var(--accent); transition: transform .2s;
  flex-shrink: 0; margin-left: 20px;
}
.faq-item.open .faq-q .icon { transform: rotate(45deg); }
.faq-a {
  max-height: 0; overflow: hidden; transition: max-height .3s ease;
  color: var(--gray-700); line-height: 1.8;
}
.faq-item.open .faq-a { max-height: 600px; padding-bottom: 24px; }

/* ---------- 文章正文 ---------- */
.article-body h2 {
  font-family: var(--serif); font-size: 32px; font-weight: 900;
  margin: 56px 0 20px; padding-top: 24px;
  border-top: 3px solid var(--line);
}
.article-body h3 {
  font-family: var(--serif); font-size: 22px; font-weight: 700;
  margin: 36px 0 14px;
}
.article-body p { margin-bottom: 20px; color: var(--gray-900); }
.article-body ul, .article-body ol { margin: 0 0 24px 24px; }
.article-body li { margin-bottom: 10px; color: var(--gray-900); }
.article-body blockquote {
  border-left: 4px solid var(--accent);
  padding: 8px 0 8px 24px; margin: 28px 0;
  font-family: var(--serif); font-size: 20px; font-style: italic;
  color: var(--gray-700);
}

/* ---------- 步骤列表（HowTo） ---------- */
.steps { list-style: none; counter-reset: step; }
.steps li {
  counter-increment: step;
  display: flex; gap: 24px; margin-bottom: 32px;
}
.steps li::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--serif); font-size: 40px; font-weight: 900;
  color: var(--accent); line-height: 1; flex-shrink: 0;
}
.steps li h4 {
  font-family: var(--serif); font-size: 20px; font-weight: 700; margin-bottom: 8px;
}

/* ---------- 产品卡片 ---------- */
.product-card {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
  padding: 40px; background: #fff; border: 1px solid var(--gray-300);
}
@media (max-width: 768px) { .product-card { grid-template-columns: 1fr; } }
.product-card img { aspect-ratio: 1/1; object-fit: cover; }
.product-card h3 {
  font-family: var(--serif); font-size: 32px; font-weight: 900; margin-bottom: 12px;
}
.product-card .price {
  font-family: var(--serif); font-size: 28px; color: var(--accent-dark);
  font-weight: 900; margin: 16px 0;
}
.btn {
  display: inline-block; background: var(--black); color: #fff;
  padding: 14px 32px; font-weight: 700; letter-spacing: 1px; font-size: 14px;
  border: none; cursor: pointer;
}
.btn:hover { background: var(--accent-dark); color: #fff; }
.btn-outline {
  background: transparent; color: var(--black); border: 2px solid var(--black);
  padding: 12px 30px;
}

/* ---------- 图册 ---------- */
.gallery {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
}
.gallery img { aspect-ratio: 1/1; object-fit: cover; }
@media (max-width: 768px) { .gallery { grid-template-columns: repeat(2, 1fr); } }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--black); color: #aaa; padding: 60px 0 30px;
  margin-top: 80px;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
  margin-bottom: 40px;
}
@media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-grid h4 {
  color: #fff; font-family: var(--serif); font-size: 16px;
  margin-bottom: 16px; letter-spacing: 1px;
}
.footer-grid a { color: #aaa; display: block; padding: 4px 0; font-size: 14px; }
.footer-grid a:hover { color: var(--accent); }
.footer-brand {
  font-family: var(--serif); font-size: 36px; font-weight: 900; color: #fff;
  margin-bottom: 12px;
}
.footer-bottom {
  border-top: 1px solid #333; padding-top: 24px;
  font-size: 12px; color: #666; display: flex; justify-content: space-between;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding: 20px 0; font-size: 13px; color: var(--gray-500);
  border-bottom: 1px solid var(--gray-300);
}
.breadcrumb a:hover { color: var(--accent-dark); }
.breadcrumb span { margin: 0 8px; }

/* ---------- 元信息条 ---------- */
.meta-bar {
  display: flex; gap: 24px; font-size: 13px; color: var(--gray-500);
  margin-bottom: 24px; flex-wrap: wrap;
}
.meta-bar strong { color: var(--ink); }

/* ---------- 提示框 ---------- */
.note {
  background: #fff8ec; border: 1px solid #e8d5a8;
  padding: 20px 24px; margin: 24px 0;
  border-left: 4px solid var(--accent);
}
.note strong { color: var(--accent-dark); }

/* ---------- 排行列表 ---------- */
.rank-list { list-style: none; }
.rank-list li {
  display: flex; gap: 24px; align-items: center;
  padding: 24px 0; border-bottom: 1px solid var(--gray-300);
}
.rank-num {
  font-family: var(--serif); font-size: 48px; font-weight: 900;
  color: var(--accent); min-width: 70px;
}
.rank-list li h4 {
  font-family: var(--serif); font-size: 22px; font-weight: 700; margin-bottom: 6px;
}
.rank-list li p { color: var(--gray-700); font-size: 14px; }