/* ==========================================================================
   木屿控股 · 企业展示官网 — 全局样式（简约高端）
   设计系统：黑白灰 + 蓝绿点缀 / 衬线标题 / 大量留白
   ========================================================================== */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f9f9;
  --ink: #141414;
  --ink-2: #4a4a4a;
  --muted: #8f8d88;
  --line: #e4e9e8;
  --accent: #12877f;
  --accent-deep: #0c6b64;
  --serif: "Cormorant Garamond", "Songti SC", "Noto Serif SC", "STSong", "SimSun", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  --max: 1200px;
  --radius: 2px;
}

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

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

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 40px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.brand { display: flex; flex-direction: column; line-height: 1.2; }
.brand-cn { font-family: var(--serif); font-size: 21px; font-weight: 600; letter-spacing: 2px; }
.brand-en { font-size: 10px; letter-spacing: 3px; color: var(--muted); text-transform: uppercase; margin-top: 3px; }

.nav { display: flex; gap: 38px; }
.nav a {
  position: relative;
  font-size: 14px;
  letter-spacing: 1px;
  color: var(--ink-2);
  padding: 6px 0;
  transition: color .2s ease;
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 1px;
  background: var(--accent);
  transition: width .25s ease;
}
.nav a:hover { color: var(--ink); }
.nav a:hover::after, .nav a.active::after { width: 100%; }
.nav a.active { color: var(--ink); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span { width: 22px; height: 1.5px; background: var(--ink); transition: .25s ease; }

/* ---------- 页头（内页通用） ---------- */
.page-hero { padding: 108px 0 64px; border-bottom: 1px solid var(--line); }
.eyebrow { font-size: 11px; letter-spacing: 4px; text-transform: uppercase; color: var(--accent); margin-bottom: 18px; }
.page-hero h1 { font-family: var(--serif); font-size: clamp(34px, 5vw, 52px); font-weight: 600; letter-spacing: 2px; line-height: 1.25; }
.page-hero .lead { max-width: 620px; color: var(--ink-2); margin-top: 22px; font-size: 16px; }

/* ---------- 通用段落标题 ---------- */
.section { padding: 96px 0; }
.section-soft { background: var(--bg-soft); }
.sec-head { margin-bottom: 56px; }
.sec-head .eyebrow { margin-bottom: 14px; }
.sec-title { font-family: var(--serif); font-size: clamp(28px, 4vw, 40px); font-weight: 600; letter-spacing: 1px; line-height: 1.3; }
.sec-desc { color: var(--muted); max-width: 560px; margin-top: 14px; font-size: 15px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 34px;
  font-size: 14px;
  letter-spacing: 2px;
  border: 1px solid var(--ink);
  transition: all .25s ease;
  cursor: pointer;
  background: none;
}
.btn-solid { background: var(--ink); color: #fff; }
.btn-solid:hover { background: var(--accent); border-color: var(--accent); }
.btn-line { color: var(--ink); }
.btn-line:hover { border-color: var(--accent); color: var(--accent); }
.btn .arrow { transition: transform .25s ease; }
.btn:hover .arrow { transform: translateX(4px); }

/* ---------- 首页 · 主视觉 ---------- */
.hero {
  padding: 140px 0 120px;
  position: relative;
  overflow: hidden;
}
.hero-grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: 60px; align-items: center; }
.hero-title {
  font-family: var(--serif);
  font-size: clamp(40px, 6.5vw, 72px);
  font-weight: 600;
  line-height: 1.18;
  letter-spacing: 1px;
}
.hero-title em { font-style: normal; color: var(--accent); }
.hero-sub { color: var(--ink-2); margin-top: 30px; max-width: 520px; font-size: 17px; }
.hero-actions { display: flex; gap: 18px; margin-top: 42px; flex-wrap: wrap; }
.hero-note { margin-top: 64px; display: flex; gap: 56px; }
.hero-note .k { font-family: var(--serif); font-size: 30px; font-weight: 600; color: var(--ink); }
.hero-note .v { font-size: 12px; letter-spacing: 1px; color: var(--muted); margin-top: 4px; }

.hero-visual {
  position: relative;
  aspect-ratio: 4 / 5;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-visual .mark { font-family: var(--serif); font-size: 80px; color: var(--accent); opacity: .35; }
.hero-visual .tag {
  position: absolute; left: 28px; bottom: 24px;
  font-size: 10px; letter-spacing: 3px; text-transform: uppercase; color: var(--muted);
}

/* ---------- 卡片 ---------- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }

.card { background: #fff; padding: 44px 38px; transition: background .25s ease; }
.card:hover { background: var(--bg-soft); }
.card .num { font-family: var(--serif); font-size: 15px; color: var(--accent); letter-spacing: 1px; }
.card h3 { font-family: var(--serif); font-size: 22px; font-weight: 600; letter-spacing: 1px; margin: 18px 0 12px; }
.card p { color: var(--ink-2); font-size: 14.5px; }
.card .more { display: inline-block; margin-top: 22px; font-size: 12px; letter-spacing: 2px; color: var(--accent); }

/* ---------- 数据统计 ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.stat { background: #fff; padding: 48px 30px; text-align: center; }
.stat .num { font-family: var(--serif); font-size: 52px; font-weight: 600; color: var(--ink); line-height: 1; }
.stat .unit { font-family: var(--serif); font-size: 22px; color: var(--accent); }
.stat .label { font-size: 13px; letter-spacing: 2px; color: var(--muted); margin-top: 14px; }

/* ---------- 时间轴 ---------- */
.timeline { position: relative; margin-top: 20px; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 1px; background: var(--line); }
.tl-item { position: relative; padding: 0 0 44px 48px; }
.tl-item::before {
  content: ""; position: absolute; left: 0; top: 8px;
  width: 15px; height: 15px; border-radius: 50%;
  border: 1px solid var(--accent); background: #fff;
}
.tl-year { font-family: var(--serif); font-size: 20px; font-weight: 600; color: var(--accent); letter-spacing: 1px; }
.tl-item h3 { font-family: var(--serif); font-size: 20px; font-weight: 600; margin: 6px 0 8px; letter-spacing: 1px; }
.tl-item p { color: var(--ink-2); font-size: 15px; }

/* ---------- 价值观 ---------- */
.values { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.value { background: #fff; padding: 44px 38px; }
.value .icon { font-family: var(--serif); font-size: 34px; color: var(--accent); }
.value h3 { font-family: var(--serif); font-size: 20px; font-weight: 600; letter-spacing: 1px; margin: 16px 0 10px; }
.value p { color: var(--ink-2); font-size: 14.5px; }

/* ---------- 新闻列表 ---------- */
.news-list { border-top: 1px solid var(--line); }
.news-item {
  display: flex; align-items: center; gap: 40px;
  padding: 32px 8px; border-bottom: 1px solid var(--line);
  transition: padding-left .25s ease;
}
.news-item:hover { padding-left: 20px; }
.news-date { font-family: var(--serif); font-size: 15px; color: var(--muted); min-width: 96px; letter-spacing: 1px; }
.news-item h3 { font-family: var(--serif); font-size: 20px; font-weight: 600; letter-spacing: 1px; flex: 1; }
.news-cat { font-size: 11px; letter-spacing: 2px; color: var(--accent); border: 1px solid var(--accent); padding: 4px 12px; border-radius: 20px; white-space: nowrap; }

/* ---------- 联系 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 60px; }
.contact-info .item { display: flex; gap: 22px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.contact-info .label { font-size: 12px; letter-spacing: 2px; color: var(--muted); text-transform: uppercase; min-width: 80px; padding-top: 3px; }
.contact-info .val { font-size: 16px; color: var(--ink); }

.form .field { margin-bottom: 24px; }
.form label { display: block; font-size: 13px; letter-spacing: 1px; color: var(--ink-2); margin-bottom: 8px; }
.form input, .form textarea {
  width: 100%; padding: 14px 0; font-size: 15px; color: var(--ink);
  background: none; border: none; border-bottom: 1px solid var(--line);
  outline: none; font-family: var(--sans);
  transition: border-color .2s ease;
}
.form input:focus, .form textarea:focus { border-color: var(--accent); }
.form textarea { resize: vertical; min-height: 120px; }

/* ---------- 页脚 ---------- */
.site-footer { background: #121212; color: #cfcfcc; margin-top: 40px; }
.footer-grid {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 48px; padding: 72px 40px 56px;
}
.footer-grid .brand-cn { color: #fff; }
.footer-grid .brand-en { color: #7c7c78; }
.footer-about { color: #9a9a96; font-size: 14px; margin-top: 20px; max-width: 300px; }
.footer-col h4 { color: #fff; font-size: 13px; letter-spacing: 2px; margin-bottom: 20px; font-weight: 500; }
.footer-col a, .footer-col p { display: block; color: #9a9a96; font-size: 14px; padding: 5px 0; transition: color .2s; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid #2a2a28; padding: 24px 40px;
  display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  font-size: 12px; color: #6f6f6b; letter-spacing: 1px;
}

/* ---------- CTA 区块 ---------- */
.cta { text-align: center; padding: 120px 0; border-top: 1px solid var(--line); }
.cta h2 { font-family: var(--serif); font-size: clamp(30px, 4.5vw, 46px); font-weight: 600; letter-spacing: 2px; }
.cta p { color: var(--muted); margin: 20px auto 40px; max-width: 520px; }

/* ---------- 淡入动画 ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .8s ease, transform .8s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 920px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { aspect-ratio: 16 / 9; }
  .grid-2, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .grid-3, .grid-4, .stats, .values { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .container { padding: 0 22px; }
  .footer-grid { padding: 56px 22px 40px; grid-template-columns: 1fr; }
  .footer-bottom { padding: 20px 22px; }
  .grid-3, .grid-4, .stats, .values { grid-template-columns: 1fr; }
  .nav {
    position: absolute; top: 76px; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    max-height: 0; overflow: hidden; transition: max-height .3s ease;
  }
  .nav.open { max-height: 420px; }
  .nav a { padding: 16px 24px; border-top: 1px solid var(--line); }
  .nav-toggle { display: flex; }
  .news-item { flex-wrap: wrap; gap: 10px 20px; }
  .hero-note { gap: 32px; }
  .section { padding: 64px 0; }
  .hero { padding: 80px 0 72px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
}