/* =========================================================
   深圳市达希计算机系统有限公司 · 投资集团官网
   Design System · 简约 · 大气 · 沉稳
   深青（Deep Ink）+ 香槟金（Champagne）
   ========================================================= */

:root {
  /* 主色 */
  --ink: #101820;          /* 近黑主文字 */
  --navy: #0d1b2a;         /* 深青主背景 */
  --navy-2: #12263d;
  --gold: #b6924f;         /* 香槟金强调 */
  --gold-2: #cdaa6a;
  --gold-soft: #f4efe4;

  /* 中性 */
  --ink-2: #33404d;
  --ink-3: #6b7684;
  --line: #e7e3da;
  --line-2: rgba(255,255,255,0.14);
  --bg: #ffffff;
  --bg-soft: #f8f6f1;      /* 暖白 */

  /* 尺寸 */
  --maxw: 1180px;
  --nav-h: 78px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);

  /* 字体 */
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", Georgia, "Times New Roman", serif;
  --sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  font-size: 16px;
}
h1, h2, h3, h4 { font-family: var(--serif); font-weight: 600; letter-spacing: 0.5px; color: var(--ink); }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { margin: 0; padding: 0; list-style: none; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

/* ---------- 通用 ---------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 12px;
  color: var(--gold); font-family: var(--sans);
  font-size: 12.5px; font-weight: 600; letter-spacing: 3px; text-transform: uppercase;
  margin-bottom: 20px;
}
.eyebrow::before { content: ""; width: 30px; height: 1px; background: var(--gold); display: inline-block; }
.eyebrow.center { justify-content: center; }

.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 32px; font-family: var(--sans); font-size: 14.5px; font-weight: 600;
  letter-spacing: 1px; cursor: pointer; border: 1px solid transparent;
  transition: all 0.3s var(--ease); border-radius: 2px;
}
.btn svg { width: 16px; height: 16px; transition: transform 0.3s var(--ease); }
.btn:hover svg { transform: translateX(4px); }
.btn-primary { background: var(--gold); color: #fff; }
.btn-primary:hover { background: var(--ink); }
.btn-dark { background: var(--ink); color: #fff; }
.btn-dark:hover { background: var(--gold); }
.btn-outline { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-outline:hover { border-color: var(--ink); }
.btn-light { background: transparent; color: #fff; border-color: rgba(255,255,255,0.4); }
.btn-light:hover { background: #fff; color: var(--ink); border-color: #fff; }

.section { padding: 110px 0; }
.section-sm { padding: 80px 0; }
.section-soft { background: var(--bg-soft); }
.section-dark { background: var(--navy); color: #fff; }
.section-dark h1, .section-dark h2, .section-dark h3, .section-dark h4 { color: #fff; }

.section-head { max-width: 760px; margin: 0 0 64px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2 { font-size: clamp(28px, 4vw, 44px); line-height: 1.25; margin: 0 0 18px; }
.section-head p { color: var(--ink-3); font-size: 17px; margin: 0; }
.section-dark .section-head p { color: rgba(255,255,255,0.7); }

.lead { font-size: 19px; line-height: 1.9; color: var(--ink-2); }

/* =========================================================
   顶部导航
   ========================================================= */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(255,255,255,0.9);
  backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.3s var(--ease);
}
.site-header.scrolled { box-shadow: 0 8px 30px rgba(16,24,32,0.07); }

.nav { height: var(--nav-h); display: flex; align-items: center; justify-content: space-between; gap: 24px; }

.brand { display: flex; align-items: center; gap: 13px; flex-shrink: 0; }
.brand .logo {
  width: 44px; height: 44px; border-radius: 2px;
  background: var(--navy); color: var(--gold);
  display: grid; place-items: center; font-family: var(--serif); font-weight: 700; font-size: 22px;
  border: 1px solid var(--gold);
}
.brand .name { line-height: 1.2; }
.brand .name b { display: block; font-family: var(--serif); font-size: 18px; letter-spacing: 1px; }
.brand .name span { font-size: 10.5px; color: var(--ink-3); letter-spacing: 2.5px; font-weight: 500; }

/* 一级菜单 */
.menu { display: flex; align-items: center; gap: 2px; }
.menu > li { position: relative; }
.menu > li > a {
  display: flex; align-items: center; gap: 6px;
  padding: 0 18px; height: var(--nav-h);
  font-size: 15px; font-weight: 500; color: var(--ink-2);
  transition: color 0.25s; position: relative;
}
.menu > li > a:hover, .menu > li.active > a { color: var(--ink); }
.menu > li > a .caret {
  width: 7px; height: 7px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-2px); transition: transform 0.25s var(--ease); opacity: 0.6;
}
.menu > li:hover > a .caret { transform: rotate(-135deg) translateY(2px); }
.menu > li > a::after {
  content: ""; position: absolute; left: 18px; right: 18px; bottom: 22px; height: 1.5px;
  background: var(--gold); transform: scaleX(0); transform-origin: left; transition: transform 0.3s var(--ease);
}
.menu > li:hover > a::after, .menu > li.active > a::after { transform: scaleX(1); }

/* 二级下拉 */
.submenu {
  position: absolute; top: calc(var(--nav-h) - 6px); left: 50%;
  transform: translateX(-50%) translateY(10px);
  min-width: 236px; background: #fff; border: 1px solid var(--line);
  box-shadow: 0 20px 50px rgba(16,24,32,0.1); padding: 12px; border-radius: 2px;
  opacity: 0; visibility: hidden; transition: all 0.28s var(--ease);
}
.menu > li:hover .submenu { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.submenu li a {
  display: flex; align-items: center; gap: 12px; padding: 12px 14px; color: var(--ink-2);
  font-size: 14.5px; border-radius: 2px; transition: background 0.2s, color 0.2s;
}
.submenu li a:hover { background: var(--bg-soft); color: var(--gold); }
.submenu li a .dot { width: 5px; height: 5px; background: var(--gold); flex-shrink: 0; transform: rotate(45deg); }
.submenu li a small { display: block; color: var(--ink-3); font-size: 12px; }

.nav-actions { display: flex; align-items: center; gap: 18px; flex-shrink: 0; }
.nav-tel { color: var(--ink); font-weight: 600; font-size: 15px; display: flex; align-items: center; gap: 7px; }
.nav-tel svg { width: 16px; height: 16px; color: var(--gold); }

.hamburger { display: none; width: 46px; height: 46px; border: 1px solid var(--line); background: #fff; cursor: pointer; padding: 0; border-radius: 2px; }
.hamburger span, .hamburger span::before, .hamburger span::after { content: ""; display: block; width: 20px; height: 1.5px; background: var(--ink); margin: 0 auto; transition: 0.3s var(--ease); position: relative; }
.hamburger span::before { position: absolute; top: -6px; }
.hamburger span::after { position: absolute; top: 6px; }
.hamburger.open span { background: transparent; }
.hamburger.open span::before { top: 0; transform: rotate(45deg); }
.hamburger.open span::after { top: 0; transform: rotate(-45deg); }

/* =========================================================
   Hero
   ========================================================= */
.hero {
  position: relative; color: #fff; min-height: calc(100vh - var(--nav-h));
  display: flex; align-items: center; padding: 100px 0;
  background:
    linear-gradient(180deg, rgba(8,17,28,0.55), rgba(8,17,28,0.78)),
    radial-gradient(1200px 700px at 78% 15%, #17324f 0%, transparent 60%),
    linear-gradient(140deg, #0b1826 0%, #0d1b2a 45%, #08111c 100%);
  overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(182,146,79,0.06) 1px, transparent 1px), linear-gradient(90deg, rgba(182,146,79,0.06) 1px, transparent 1px);
  background-size: 64px 64px; mask-image: radial-gradient(circle at 70% 30%, #000, transparent 75%); pointer-events: none;
}
.hero .container { position: relative; z-index: 2; }
.hero-inner { max-width: 820px; }
.hero .eyebrow { color: var(--gold-2); }
.hero h1 {
  font-size: clamp(38px, 6vw, 72px); line-height: 1.16; margin: 0 0 26px; color: #fff; font-weight: 500;
  letter-spacing: 1px;
}
.hero h1 em { font-style: normal; color: var(--gold-2); }
.hero p { font-size: clamp(16px, 2vw, 20px); color: rgba(255,255,255,0.8); margin: 0 0 40px; max-width: 640px; }
.hero-actions { display: flex; gap: 18px; flex-wrap: wrap; }
.hero-scroll { position: absolute; bottom: 34px; left: 50%; transform: translateX(-50%); color: rgba(255,255,255,0.5); font-size: 12px; letter-spacing: 2px; z-index: 2; text-align: center; }
.hero-scroll .line { width: 1px; height: 40px; background: linear-gradient(var(--gold), transparent); margin: 10px auto 0; }

/* 页面小 Banner */
.page-hero {
  color: #fff; padding: 120px 0 90px; position: relative;
  background:
    linear-gradient(180deg, rgba(8,17,28,0.5), rgba(8,17,28,0.8)),
    radial-gradient(900px 500px at 82% 0%, #17324f 0%, transparent 60%),
    linear-gradient(140deg, #0b1826, #08111c);
}
.page-hero .eyebrow { color: var(--gold-2); }
.page-hero h1 { font-size: clamp(30px, 4.6vw, 52px); margin: 0 0 16px; color: #fff; font-weight: 500; }
.page-hero p { color: rgba(255,255,255,0.78); max-width: 640px; margin: 0; font-size: 17px; }
.breadcrumb { margin-top: 24px; font-size: 13.5px; color: rgba(255,255,255,0.6); letter-spacing: 0.5px; }
.breadcrumb a:hover { color: var(--gold-2); }
.breadcrumb span { margin: 0 10px; opacity: 0.5; }

/* =========================================================
   布局工具
   ========================================================= */
.grid { display: grid; gap: 30px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: center; }
.split.wide-l { grid-template-columns: 1.15fr 0.85fr; }
.split.wide-r { grid-template-columns: 0.85fr 1.15fr; }

/* 视觉占位块（衬线数字 / 图标） */
.visual {
  position: relative; min-height: 380px; border: 1px solid var(--line);
  background: linear-gradient(150deg, var(--bg-soft), #fff);
  display: grid; place-items: center; overflow: hidden;
}
.visual::after { content: ""; position: absolute; inset: 14px; border: 1px solid var(--gold); opacity: 0.35; pointer-events: none; }
.visual svg { width: 130px; height: 130px; color: var(--gold); opacity: 0.85; }
.visual.dark { background: linear-gradient(150deg, var(--navy), var(--navy-2)); border-color: transparent; }
.visual.dark svg { color: var(--gold-2); }

/* =========================================================
   数字统计带
   ========================================================= */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); }
.stats .stat { padding: 8px 24px; border-left: 1px solid var(--line-2); }
.stats .stat:first-child { border-left: none; padding-left: 0; }
.stat b { font-family: var(--serif); font-size: clamp(34px, 4.6vw, 54px); font-weight: 600; display: block; line-height: 1; color: #fff; }
.stat b .u { color: var(--gold-2); }
.stat span { color: rgba(255,255,255,0.65); font-size: 14px; letter-spacing: 0.5px; display: block; margin-top: 12px; }
.stats.light .stat { border-color: var(--line); }
.stats.light .stat b { color: var(--ink); }
.stats.light .stat b .u { color: var(--gold); }
.stats.light .stat span { color: var(--ink-3); }

/* =========================================================
   卡片 / 特点
   ========================================================= */
.feat { padding: 38px 34px; background: #fff; border: 1px solid var(--line); transition: all 0.35s var(--ease); border-radius: 2px; }
.feat:hover { border-color: var(--gold); transform: translateY(-4px); box-shadow: 0 22px 50px rgba(16,24,32,0.07); }
.feat .no { font-family: var(--serif); font-size: 15px; color: var(--gold); letter-spacing: 2px; }
.feat .ico { width: 52px; height: 52px; color: var(--gold); margin-bottom: 22px; }
.feat .ico svg { width: 52px; height: 52px; }
.feat h3 { font-size: 21px; margin: 14px 0 12px; }
.feat p { margin: 0; color: var(--ink-3); font-size: 15px; }
.feat .line-top { width: 34px; height: 2px; background: var(--gold); margin-bottom: 22px; }

/* 简洁列表卡（投资领域） */
.tile { padding: 34px 32px; border: 1px solid var(--line); background: #fff; transition: all 0.35s var(--ease); position: relative; overflow: hidden; border-radius: 2px; }
.tile::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--gold); transform: scaleY(0); transform-origin: top; transition: transform 0.35s var(--ease); }
.tile:hover { background: var(--bg-soft); }
.tile:hover::before { transform: scaleY(1); }
.tile .ico { width: 42px; height: 42px; color: var(--gold); margin-bottom: 18px; }
.tile .ico svg { width: 42px; height: 42px; }
.tile h3 { font-size: 20px; margin: 0 0 10px; }
.tile p { margin: 0; color: var(--ink-3); font-size: 14.5px; }

/* 富文本锚点区块 */
.rich { scroll-margin-top: calc(var(--nav-h) + 30px); }
.rich h2 { font-size: clamp(26px, 3.4vw, 38px); margin: 0 0 20px; }
.rich p { color: var(--ink-2); margin: 0 0 18px; }

/* 引用 / 理念 */
.quote { max-width: 900px; margin: 0 auto; text-align: center; }
.quote p { font-family: var(--serif); font-size: clamp(22px, 3.2vw, 34px); line-height: 1.6; color: var(--ink); margin: 0; font-weight: 500; }
.section-dark .quote p { color: #fff; }
.quote .mark { font-family: var(--serif); font-size: 60px; color: var(--gold); line-height: 0.5; display: block; margin-bottom: 24px; }

/* 时间线 */
.timeline { max-width: 860px; margin: 0 auto; }
.timeline .item { position: relative; padding: 0 0 46px 42px; border-left: 1px solid var(--line); }
.timeline .item:last-child { padding-bottom: 0; border-color: transparent; }
.timeline .item::before { content: ""; position: absolute; left: -6px; top: 4px; width: 11px; height: 11px; background: #fff; border: 2px solid var(--gold); border-radius: 50%; }
.timeline .item .year { font-family: var(--serif); color: var(--gold); font-size: 22px; font-weight: 600; }
.timeline .item h4 { margin: 6px 0 8px; font-size: 19px; }
.timeline .item p { margin: 0; color: var(--ink-3); }

/* 核心投资企业 / 组合卡 */
.portfolio-card {
  display: grid; grid-template-columns: 200px 1fr; gap: 0; border: 1px solid var(--line);
  background: #fff; overflow: hidden; border-radius: 2px; transition: box-shadow 0.35s var(--ease);
}
.portfolio-card:hover { box-shadow: 0 24px 60px rgba(16,24,32,0.09); }
.portfolio-card .logo-cell { background: var(--navy); display: grid; place-items: center; padding: 30px; }
.portfolio-card .logo-cell .mark { width: 70px; height: 70px; border: 1px solid var(--gold); color: var(--gold); display: grid; place-items: center; font-family: var(--serif); font-size: 34px; }
.portfolio-card .body { padding: 34px 38px; }
.portfolio-card .body .tag { color: var(--gold); font-size: 12.5px; letter-spacing: 2px; text-transform: uppercase; font-weight: 600; }
.portfolio-card .body h3 { font-size: 24px; margin: 8px 0 12px; }
.portfolio-card .body p { margin: 0 0 16px; color: var(--ink-3); }
.portfolio-card .body .chips { display: flex; flex-wrap: wrap; gap: 8px; }
.portfolio-card .body .chips span { font-size: 12.5px; color: var(--ink-2); border: 1px solid var(--line); padding: 5px 14px; border-radius: 999px; }
.portfolio-card .body .site { margin: 18px 0 0; }
.portfolio-card .body .site a { display: inline-flex; align-items: center; gap: 7px; color: var(--gold); font-weight: 600; font-size: 14px; letter-spacing: 0.3px; transition: color 0.2s; }
.portfolio-card .body .site a::after { content: "↗"; font-size: 13px; }
.portfolio-card .body .site a:hover { color: var(--ink); }

/* 正文内的外部链接 */
.link-out { color: var(--gold); font-weight: 600; }
.link-out:hover { color: var(--ink); text-decoration: underline; }

/* 治理 / 披露列表 */
.list-rows { border-top: 1px solid var(--line); }
.list-rows .row { display: flex; align-items: center; gap: 20px; padding: 24px 4px; border-bottom: 1px solid var(--line); transition: padding 0.3s var(--ease); }
.list-rows .row:hover { padding-left: 14px; }
.list-rows .row .date { font-family: var(--serif); color: var(--gold); font-size: 15px; min-width: 110px; flex-shrink: 0; }
.list-rows .row .txt { flex: 1; }
.list-rows .row .txt h4 { margin: 0; font-size: 17px; font-weight: 600; }
.list-rows .row .arr { color: var(--ink-3); flex-shrink: 0; }
.list-rows .row .arr svg { width: 20px; height: 20px; transition: transform 0.3s; }
.list-rows .row:hover .arr { color: var(--gold); }
.list-rows .row:hover .arr svg { transform: translateX(5px); }

/* 责任卡（图标居中） */
.resp-card { text-align: center; padding: 44px 32px; border: 1px solid var(--line); background: #fff; border-radius: 2px; transition: all 0.35s var(--ease); }
.resp-card:hover { border-color: var(--gold); transform: translateY(-4px); }
.resp-card .circle { width: 76px; height: 76px; border-radius: 50%; border: 1px solid var(--gold); color: var(--gold); display: grid; place-items: center; margin: 0 auto 24px; transition: background 0.35s, color 0.35s; }
.resp-card:hover .circle { background: var(--gold); color: #fff; }
.resp-card .circle svg { width: 34px; height: 34px; }
.resp-card h3 { font-size: 21px; margin: 0 0 12px; }
.resp-card p { margin: 0; color: var(--ink-3); font-size: 15px; }

/* 新闻卡 */
.news-card { background: #fff; border: 1px solid var(--line); overflow: hidden; display: flex; flex-direction: column; transition: all 0.35s var(--ease); border-radius: 2px; }
.news-card:hover { box-shadow: 0 24px 55px rgba(16,24,32,0.09); transform: translateY(-4px); }
.news-card .thumb { height: 190px; background: linear-gradient(140deg, var(--navy), var(--navy-2)); position: relative; display: grid; place-items: center; }
.news-card .thumb svg { width: 54px; height: 54px; color: var(--gold-2); opacity: 0.75; }
.news-card .thumb .cat { position: absolute; left: 18px; top: 18px; background: var(--gold); color: #fff; font-size: 11.5px; font-weight: 600; letter-spacing: 1px; padding: 5px 13px; }
.news-card .body { padding: 26px 28px; flex: 1; display: flex; flex-direction: column; }
.news-card .date { color: var(--gold); font-family: var(--serif); font-size: 14px; }
.news-card h3 { font-size: 19px; margin: 10px 0 12px; line-height: 1.5; }
.news-card p { color: var(--ink-3); font-size: 14.5px; margin: 0 0 18px; flex: 1; }
.news-card .more { font-size: 13.5px; letter-spacing: 1px; color: var(--ink); font-weight: 600; }

/* 联系 */
.contact-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 60px; }
.contact-info .row { display: flex; gap: 18px; padding: 26px 0; border-bottom: 1px solid var(--line); }
.contact-info .row:first-of-type { border-top: 1px solid var(--line); }
.contact-info .row .ico { width: 46px; height: 46px; border: 1px solid var(--gold); color: var(--gold); display: grid; place-items: center; flex-shrink: 0; }
.contact-info .row h4 { margin: 0 0 4px; font-size: 16px; }
.contact-info .row p { margin: 0; color: var(--ink-3); }
.contact-info .row a { color: var(--ink); font-weight: 600; }
.contact-info .row a:hover { color: var(--gold); }

.form { background: #fff; border: 1px solid var(--line); padding: 40px; border-radius: 2px; }
.form .field { margin-bottom: 20px; }
.form label { display: block; font-size: 13.5px; font-weight: 600; margin-bottom: 9px; letter-spacing: 0.5px; }
.form input, .form textarea { width: 100%; padding: 14px 16px; border: 1px solid var(--line); font: inherit; color: var(--ink); background: var(--bg-soft); transition: border-color 0.25s, background 0.25s; border-radius: 2px; }
.form input:focus, .form textarea:focus { outline: none; border-color: var(--gold); background: #fff; }
.form textarea { resize: vertical; min-height: 120px; }
.form .note { color: var(--ink-3); font-size: 13px; margin-top: 8px; }

.map-embed { border: 1px solid var(--line); min-height: 260px; background: var(--bg-soft); display: grid; place-items: center; color: var(--ink-3); }

/* CTA 大段 */
.cta-band { background: var(--navy); color: #fff; text-align: center; position: relative; overflow: hidden; }
.cta-band::before { content: ""; position: absolute; inset: 0; background: radial-gradient(700px 400px at 50% -20%, rgba(182,146,79,0.18), transparent 60%); }
.cta-band .container { position: relative; z-index: 2; }
.cta-band h2 { color: #fff; font-size: clamp(28px, 3.8vw, 44px); margin: 0 0 18px; font-weight: 500; }
.cta-band p { color: rgba(255,255,255,0.75); font-size: 18px; margin: 0 0 34px; }
.cta-band .hero-actions { justify-content: center; }

/* =========================================================
   页脚
   ========================================================= */
.site-footer { background: #08111c; color: rgba(255,255,255,0.62); padding-top: 76px; }
.footer-top { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 44px; padding-bottom: 52px; }
.site-footer h4 { color: #fff; font-family: var(--sans); font-size: 14px; letter-spacing: 1.5px; text-transform: uppercase; margin: 0 0 22px; }
.site-footer .brand .logo { background: transparent; }
.site-footer .brand .name b { color: #fff; }
.site-footer .brand .name span { color: rgba(255,255,255,0.5); }
.footer-about { margin: 22px 0 0; font-size: 14px; line-height: 1.9; max-width: 340px; }
.footer-links li { margin-bottom: 13px; }
.footer-links a { font-size: 14px; transition: color 0.2s; }
.footer-links a:hover { color: var(--gold-2); }
.footer-contact li { display: flex; gap: 11px; margin-bottom: 14px; font-size: 14px; }
.footer-contact svg { width: 17px; height: 17px; color: var(--gold); flex-shrink: 0; margin-top: 3px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding: 26px 0; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; font-size: 13px; }
.footer-bottom a:hover { color: var(--gold-2); }

/* =========================================================
   动画 / 交互
   ========================================================= */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.8s var(--ease), transform 0.8s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

.to-top {
  position: fixed; right: 26px; bottom: 26px; width: 48px; height: 48px;
  background: var(--navy); color: var(--gold); border: 1px solid var(--gold); cursor: pointer;
  display: grid; place-items: center; opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: 0.35s var(--ease); z-index: 900;
}
.to-top:hover { background: var(--gold); color: #fff; }
.to-top.show { opacity: 1; visibility: visible; transform: none; }

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 992px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .split, .split.wide-l, .split.wide-r { grid-template-columns: 1fr; gap: 40px; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 40px 0; }
  .stats .stat { border-left: none; padding-left: 0; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 44px; }
  .section { padding: 80px 0; }
}

@media (max-width: 768px) {
  :root { --nav-h: 62px; }
  .container { padding: 0 20px; }

  /* 品牌在小屏收紧，避免挤压 */
  .brand { gap: 10px; }
  .brand .logo { width: 38px; height: 38px; font-size: 19px; }
  .brand .name b { font-size: 16px; }
  .brand .name span { font-size: 9px; letter-spacing: 2px; }

  .nav-actions .btn, .nav-tel { display: none; }
  .hamburger { display: block; }

  /* 抽屉式菜单：用动态视口高度 + 安全区，避免被浏览器地址栏/底栏遮挡导致显示不全 */
  .menu {
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    height: calc(100vh - var(--nav-h));
    height: calc(100dvh - var(--nav-h));
    flex-direction: column; align-items: stretch; gap: 0; background: #fff;
    padding: 10px 22px calc(40px + env(safe-area-inset-bottom));
    overflow-y: auto; -webkit-overflow-scrolling: touch; overscroll-behavior: contain;
    transform: translateX(100%);
    transition: transform 0.35s var(--ease); box-shadow: -12px 0 50px rgba(0,0,0,0.12);
  }
  .menu.open { transform: none; }
  .menu > li > a { height: auto; padding: 16px 4px; border-bottom: 1px solid var(--line); justify-content: space-between; font-size: 16px; }
  .menu > li > a::after { display: none; }
  .menu > li > a .caret { width: 8px; height: 8px; transform: rotate(45deg); opacity: 0.5; }
  .menu > li.expanded > a .caret { transform: rotate(-135deg) translateY(2px); }
  .submenu { position: static; transform: none; opacity: 1; visibility: visible; box-shadow: none; border: none; min-width: 0; max-height: 0; overflow: hidden; padding: 0 0 0 14px; transition: max-height 0.35s var(--ease); }
  .menu > li.expanded .submenu { max-height: 640px; padding: 4px 0 14px 14px; }
  .submenu li a { padding: 12px 10px; }

  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: 34px; }
  .portfolio-card { grid-template-columns: 1fr; }
  .portfolio-card .logo-cell { padding: 26px; }
  .list-rows .row { flex-wrap: wrap; gap: 6px 20px; }
  .list-rows .row .date { min-width: 0; }
  .section { padding: 66px 0; }
  .section-sm { padding: 56px 0; }
  .section-head { margin-bottom: 44px; }

  /* Hero 用动态视口高度，避免地址栏收缩时留白/溢出 */
  .hero { min-height: calc(100vh - var(--nav-h)); min-height: calc(100dvh - var(--nav-h)); padding: 72px 0; }
  .hero-actions .btn, .cta-band .hero-actions .btn { flex: 1 1 auto; justify-content: center; }
}

@media (max-width: 480px) {
  body { font-size: 15px; }
  .container { padding: 0 16px; }
  .section { padding: 52px 0; }
  .section-head { margin-bottom: 36px; }
  .hero { padding: 60px 0; }
  .hero p { margin-bottom: 32px; }
  .hero-actions { gap: 12px; width: 100%; }
  .btn { padding: 13px 20px; font-size: 14px; }
  .stats { grid-template-columns: 1fr 1fr; gap: 32px 0; }
  .page-hero { padding: 88px 0 56px; }
  .page-hero p { font-size: 15.5px; }
  .form { padding: 26px 20px; }
  .feat { padding: 30px 24px; }
  .tile { padding: 28px 24px; }
  .portfolio-card .body { padding: 28px 24px; }
  .to-top { right: 16px; bottom: 16px; width: 44px; height: 44px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}