/* FIELD EARTH 官网 · 全站样式（server/site_src/site.css → server/site/site.css，由 scripts/build_site.py 复制）
   只用系统字体：国内访问不依赖任何境外资源 */
:root {
  --ink: #1F2A36;
  --ink-2: #2A3440;
  --ink-3: #161E27;
  --paper: #F5F4F0;
  --cream: #FBF8F1;
  --white: #FFFFFF;
  --tan: #B8956A;
  --line: #E1DDD4;
  --text: #1A1A1A;
  --body: #3A4048;
  --sub: #6F7680;
  --on-ink: #F5F4F0;
  --on-ink-sub: #AEB6C0;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", system-ui, sans-serif;
  --display: "Helvetica Neue", "Arial Narrow", Arial, var(--sans);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--text); font: 16px/1.8 var(--sans); -webkit-font-smoothing: antialiased; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
h1, h2, h3 { margin: 0; text-wrap: balance; }
p { margin: 0; }
.wrap { max-width: 1120px; margin: 0 auto; padding-inline: 20px; }
.eyebrow { font: 600 12px/1.2 var(--display); letter-spacing: .22em; text-transform: uppercase; color: var(--tan); }
.h2 { font-size: clamp(24px, 3.2vw, 34px); line-height: 1.35; font-weight: 600; letter-spacing: .02em; }
.lead { color: var(--body); font-size: 17px; }
.more { display: inline-block; justify-self: start; margin-top: 4px; font: 600 13px/1 var(--display); letter-spacing: .16em; text-decoration: none; border-bottom: 1px solid currentColor; padding-bottom: 4px; }
section { padding-block: clamp(56px, 9vw, 112px); }
.prose { display: grid; gap: 1.1em; max-width: 38em; color: var(--body); }
.prose .lead { color: var(--text); }

/* 页头 */
.top { background: var(--ink); color: var(--on-ink); position: sticky; top: 0; z-index: 10; }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px 24px; padding-block: 16px; flex-wrap: wrap; }
.top .logo img { width: 92px; }
.top nav { display: flex; gap: 4px clamp(14px, 2.2vw, 28px); font-size: 14px; letter-spacing: .06em; }
.top nav a { text-decoration: none; color: var(--on-ink-sub); padding-block: 4px; border-bottom: 1px solid transparent; white-space: nowrap; }
.top nav a:hover { color: var(--on-ink); }
.top nav a.on { color: var(--on-ink); border-bottom-color: var(--tan); }

/* 首页首屏 */
.hero { position: relative; min-height: min(80vh, 720px); display: flex; align-items: flex-end; color: var(--on-ink); background: var(--ink) url(img/hero.jpg) center 40% / cover no-repeat; }
.hero::before { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(31,42,54,.35) 0%, rgba(31,42,54,.1) 40%, rgba(31,42,54,.85) 100%); }
.hero .wrap { position: relative; width: 100%; padding-block: 0 clamp(44px, 8vh, 88px); display: grid; gap: 14px; }
.hero h1 { font: 700 clamp(40px, 8vw, 92px)/1 var(--display); letter-spacing: .02em; }
.hero p { font-size: clamp(16px, 2vw, 20px); letter-spacing: .12em; color: var(--on-ink-sub); }

/* 二级页页首 */
.page-head { padding-block: clamp(48px, 7vw, 88px) clamp(32px, 4vw, 48px); }
.page-head .wrap { display: grid; gap: 14px; }
.page-head h1 { font-size: clamp(30px, 4.4vw, 48px); line-height: 1.25; font-weight: 600; letter-spacing: .03em; }
.page-head .lead { max-width: 40em; }
.banner { background: var(--ink); }
.banner img { width: 100%; max-height: 640px; object-fit: cover; }

/* 图文两栏 */
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(32px, 6vw, 80px); align-items: center; }
.split.rev > :first-child { order: 2; }
.split .text { display: grid; gap: 18px; }
.split figure { margin: 0; }
.split figcaption, .cap { margin-top: 10px; font-size: 13px; color: var(--sub); }
.alt { background: var(--cream); border-block: 1px solid var(--line); }
.dark { background: var(--ink); color: var(--on-ink); }
.dark .prose, .dark .lead { color: var(--on-ink-sub); }

/* 首页两个入口 */
.entries { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.entry { display: grid; gap: 14px; text-decoration: none; background: var(--white); padding: 20px; border: 1px solid var(--line); }
.entry img { width: 100%; aspect-ratio: 3 / 2; object-fit: cover; }
.entry h3 { font-size: 19px; font-weight: 600; }
.entry p { color: var(--body); font-size: 15px; }
.entry:hover h3 { text-decoration: underline; text-underline-offset: 4px; }

/* 板型技术三枚 */
.tech { display: flex; flex-wrap: wrap; gap: 10px; }
.tech span { border: 1px solid currentColor; padding: 6px 14px; font: 600 13px/1 var(--display); letter-spacing: .12em; }

/* 产品线与雪板卡片 */
.line-block { display: grid; gap: 22px; padding-block: 40px; border-top: 1px solid var(--line); scroll-margin-top: 90px; }
.line-head { display: grid; gap: 8px; max-width: 46em; }
.line-head h2 { font: 600 clamp(20px, 2.4vw, 26px)/1.3 var(--display); letter-spacing: .1em; }
.line-head .tags { font: 600 12px/1.4 var(--display); letter-spacing: .14em; color: var(--tan); }
.line-head p { color: var(--body); font-size: 15px; }
.cards { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }
.card { display: grid; gap: 10px; align-content: start; text-decoration: none; }
.card .pic { background: var(--white); border: 1px solid var(--line); aspect-ratio: 4 / 5; display: grid; place-items: center; overflow: hidden; }
.card .pic img { width: 100%; height: 100%; object-fit: contain; }
.card h3 { font: 600 15px/1.3 var(--display); letter-spacing: .08em; }
.card p { font-size: 13px; line-height: 1.7; color: var(--sub); }
.card:hover h3 { text-decoration: underline; text-underline-offset: 4px; }
.line-index { display: flex; flex-wrap: wrap; gap: 8px 10px; }
.line-index a { text-decoration: none; border: 1px solid var(--line); background: var(--white); padding: 6px 12px; font: 600 12px/1.2 var(--display); letter-spacing: .1em; }
.line-index a:hover { border-color: var(--ink); }

/* 首页产品线索引 */
.lines { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--line); }
.lines a { padding: 20px 20px 22px 0; border-bottom: 1px solid var(--line); display: grid; gap: 6px; align-content: start; text-decoration: none; }
.lines h3 { font: 600 14px/1.3 var(--display); letter-spacing: .14em; }
.lines p { font-size: 14px; color: var(--body); }
.lines a:hover h3 { text-decoration: underline; text-underline-offset: 4px; }

/* 雪板详情 */
.crumb { font-size: 13px; color: var(--sub); }
.crumb a { text-decoration: none; }
.crumb a:hover { text-decoration: underline; }
.board-top { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: clamp(28px, 5vw, 64px); align-items: start; }
.board-top .main { background: var(--white); border: 1px solid var(--line); }
.board-top .main img { width: 100%; aspect-ratio: 1; object-fit: contain; }
.board-top .info { display: grid; gap: 18px; }
.board-top h1 { font: 600 clamp(28px, 4vw, 42px)/1.15 var(--display); letter-spacing: .04em; }
.board-top .tags { font: 600 12px/1.6 var(--display); letter-spacing: .14em; color: var(--tan); }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 8px 18px; font-size: 14px; border-top: 1px solid var(--line); padding-top: 16px; }
.kv dt { color: var(--sub); }
.kv dd { margin: 0; }
.gallery { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.gallery img { width: 100%; aspect-ratio: 1; object-fit: contain; background: var(--white); border: 1px solid var(--line); }
.tbl-wrap { overflow-x: auto; border: 1px solid var(--line); background: var(--white); }
table.spec { border-collapse: collapse; min-width: 100%; font-size: 14px; font-variant-numeric: tabular-nums; }
table.spec th, table.spec td { padding: 10px 14px; border-bottom: 1px solid var(--line); text-align: left; white-space: nowrap; }
table.spec thead th { background: var(--ink); color: var(--on-ink); font: 600 13px/1.2 var(--display); letter-spacing: .08em; }
table.spec tbody th { color: var(--sub); font-weight: 400; position: sticky; left: 0; background: var(--white); }
.note { font-size: 13px; color: var(--sub); }

/* 维修保养：国内申请方式 */
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; }
.steps div { border-top: 2px solid var(--ink); padding-top: 16px; display: grid; gap: 8px; align-content: start; }
.steps h3 { font-size: 17px; font-weight: 600; }
.steps p { font-size: 15px; color: var(--body); }

/* 历史时间线 */
.timeline { display: grid; gap: 0; border-top: 1px solid var(--line); }
.tl { display: grid; grid-template-columns: 120px minmax(0, 1fr) 200px; gap: 24px; padding-block: 28px; border-bottom: 1px solid var(--line); align-items: start; }
.tl .y { font: 700 28px/1 var(--display); letter-spacing: .04em; color: var(--ink); }
.tl .t { display: grid; gap: .8em; color: var(--body); }
.tl .t b { color: var(--text); font-weight: 600; letter-spacing: .04em; }
.tl .p img { max-height: 200px; width: auto; margin-left: auto; }

/* 会员 */
.feats { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 28px; counter-reset: f; }
.feat { border-top: 1px solid rgba(245,244,240,.25); padding-top: 18px; display: grid; gap: 8px; align-content: start; }
.feat::before { counter-increment: f; content: "0" counter(f); font: 600 12px/1 var(--display); letter-spacing: .18em; color: var(--tan); }
.feat h3 { font-size: 17px; font-weight: 600; }
.feat p { font-size: 14px; line-height: 1.7; color: var(--on-ink-sub); }
.poem { font-size: clamp(18px, 2.1vw, 22px); line-height: 2; letter-spacing: .04em; }

/* 收尾与页脚（备案号必须挂在每页最下方并链到工信部） */
.closing { position: relative; color: var(--on-ink); background: var(--ink) url(img/night.jpg) center / cover no-repeat; padding-block: clamp(88px, 14vw, 160px); text-align: center; }
.closing::before { content: ""; position: absolute; inset: 0; background: rgba(31,42,54,.35); }
.closing .wrap { position: relative; display: grid; gap: 14px; justify-items: center; }
.closing img { width: 111px; }
.closing p { letter-spacing: .2em; }
footer { background: var(--ink-3); color: var(--on-ink-sub); font-size: 13px; }
footer .wrap { display: grid; gap: 14px; padding-block: 32px; }
footer .row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px 24px; }
footer nav { display: flex; flex-wrap: wrap; gap: 6px 20px; }
footer a { color: var(--on-ink-sub); text-decoration: none; }
footer a:hover { color: var(--on-ink); text-decoration: underline; }

@media (max-width: 900px) {
  .split, .board-top { grid-template-columns: minmax(0, 1fr); }
  .split.rev > :first-child { order: 0; }
  .cards { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .lines { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .feats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tl { grid-template-columns: 90px minmax(0, 1fr); }
  .tl .p { grid-column: 2; }
  .tl .p img { margin-left: 0; max-height: 160px; }
}
@media (max-width: 600px) {
  .top nav { width: 100%; overflow-x: auto; padding-bottom: 2px; }
  .entries, .lines, .feats, .steps { grid-template-columns: minmax(0, 1fr); }
  .cards, .gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lines a { padding-right: 0; }
  .tl { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  .tl .p { grid-column: auto; }
}