/* =========================================================
   尚益科技 × FrontMind 融合官网 - 全局样式
   配色与 Logo（绿/蓝/青环形）协调
   ========================================================= */

/* ---------- 设计变量 ---------- */
:root {
  --c-navy: #0a1b3d;
  --c-navy-2: #0f2a5c;
  --c-blue: #1e5ef3;
  --c-blue-2: #2f6df6;
  --c-cyan: #0fb7b0;
  --c-teal: #17b37a;
  --c-green: #18a86b;
  --c-purple: #6d3db5;
  --c-ink: #10213f;
  --c-muted: #5b6c8f;
  --c-border: #e4eaf5;
  --c-light: #f5f8ff;
  --c-white: #ffffff;
  --grad-brand: linear-gradient(120deg, #0a1b3d 0%, #1e5ef3 52%, #0fb7b0 100%);
  --grad-soft: linear-gradient(120deg, #eef4ff 0%, #e8fbfa 100%);
  --shadow-sm: 0 2px 10px rgba(15, 33, 63, .06);
  --shadow-md: 0 12px 34px rgba(15, 33, 63, .10);
  --shadow-lg: 0 24px 60px rgba(15, 33, 63, .16);
  --radius: 14px;
  --radius-lg: 20px;
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  --maxw: 1200px;
}

/* ---------- Reset ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  color: var(--c-ink);
  background: var(--c-white);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
h1, h2, h3, h4 { line-height: 1.3; font-weight: 700; color: var(--c-navy); }

/* ---------- 布局 ---------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 880px; }

section { position: relative; }
.section { padding: 88px 0; }
.section-soft { background: var(--c-light); }
.section-tint { background: #eef3ff; }
.section-gray { background: #f6f7fa; }
.section-grad { background: var(--grad-brand); color: #fff; }
.section-grad h2, .section-grad h3 { color: #fff; }

/* 区块标题 */
.sec-head { text-align: center; max-width: 760px; margin: 0 auto 52px; }
.sec-eyebrow {
  display: inline-block; font-size: 13px; font-weight: 600; letter-spacing: 2px;
  color: var(--c-blue); background: #e8efff; padding: 6px 16px; border-radius: 999px;
  margin-bottom: 14px; text-transform: uppercase;
}
.section-grad .sec-eyebrow { background: rgba(255,255,255,.16); color: #fff; }
.sec-head h2 { font-size: clamp(26px, 3.6vw, 38px); margin-bottom: 14px; }
.sec-head p { color: var(--c-muted); font-size: 16px; }
.section-grad .sec-head p { color: rgba(255,255,255,.85); }
.sec-head.left { text-align: left; margin-left: 0; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
  transition: box-shadow .3s;
}
.site-header.scrolled { box-shadow: var(--shadow-md); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: flex; align-items: center; gap: 10px; }
.logo img { height: 40px; width: auto; }
.logo .logo-text { font-weight: 800; font-size: 19px; color: var(--c-navy); letter-spacing: .5px; }
.logo .logo-text small { display: block; font-size: 10px; font-weight: 600; letter-spacing: 1.6px; color: var(--c-cyan); text-transform: uppercase; }

.main-nav ul { display: flex; align-items: center; gap: 6px; }
.main-nav a.nav-link {
  display: block; padding: 10px 16px; font-size: 15px; font-weight: 500; color: var(--c-ink);
  border-radius: 8px; transition: .2s;
}
.main-nav a.nav-link:hover, .main-nav a.nav-link.active { color: var(--c-blue); background: #eef3ff; }
.nav-cta { margin-left: 10px; }
.main-nav .has-drop { position: relative; }
.main-nav .has-drop > a::after { content: "▾"; margin-left: 5px; font-size: 11px; color: var(--c-muted); }
.main-nav .dropdown {
  position: absolute; top: 100%; left: 0; min-width: 220px; background: #fff; border: 1px solid var(--c-border);
  border-radius: 12px; box-shadow: var(--shadow-md); padding: 8px; opacity: 0; visibility: hidden;
  transform: translateY(10px); transition: .25s; z-index: 50;
}
.main-nav .has-drop:hover .dropdown, .main-nav .has-drop:focus-within .dropdown { opacity: 1; visibility: visible; transform: none; }
.main-nav .dropdown a { display: block; padding: 10px 14px; border-radius: 8px; font-size: 14px; font-weight: 500; color: var(--c-ink); }
.main-nav .dropdown a:hover { background: #eef3ff; color: var(--c-blue); }
.main-nav .dropdown .dd-desc { display: block; font-size: 11.5px; color: var(--c-muted); font-weight: 400; margin-top: 2px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: inherit; font-size: 15px; font-weight: 600; cursor: pointer; border: none;
  border-radius: 999px; padding: 12px 26px; transition: .25s; white-space: nowrap;
}
.btn-primary { background: var(--grad-brand); color: #fff; box-shadow: 0 8px 20px rgba(30,94,243,.30); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(30,94,243,.40); }
.btn-ghost { background: transparent; color: #fff; border: 1.5px solid rgba(255,255,255,.55); }
.btn-ghost:hover { background: rgba(255,255,255,.12); border-color: #fff; }
.btn-outline { background: transparent; color: var(--c-blue); border: 1.5px solid var(--c-blue); }
.btn-outline:hover { background: var(--c-blue); color: #fff; }
.btn-light { background: #fff; color: var(--c-navy); box-shadow: var(--shadow-sm); }
.btn-light:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-lg { padding: 15px 34px; font-size: 16px; }
.btn-block { width: 100%; }

/* 汉堡菜单 */
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--c-navy); border-radius: 2px; transition: .3s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative; color: #fff; overflow: hidden;
  background: linear-gradient(135deg, #081633 0%, #123a86 48%, #0d7f86 100%);
}
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; opacity: .22; }
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(110deg, rgba(8,22,51,.92) 0%, rgba(16,46,120,.82) 45%, rgba(10,100,110,.62) 100%);
}
.hero-inner { position: relative; z-index: 2; padding: 110px 0 120px; max-width: var(--maxw); margin: 0 auto; }
.hero .container { position: relative; z-index: 2; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600;
  letter-spacing: 2px; color: #9fe8ff; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.18);
  padding: 7px 16px; border-radius: 999px; margin-bottom: 22px;
}
/* Hero 品牌标语（醒目呈现） */
.hero-brand {
  display: inline-flex; align-items: center; gap: 12px; flex-wrap: wrap;
  font-size: 16px; font-weight: 700; letter-spacing: 1.2px; color: #fff;
  background: linear-gradient(90deg, rgba(23,84,214,.55), rgba(15,150,160,.45));
  border: 1.5px solid rgba(140,225,255,.55); border-radius: 999px;
  padding: 12px 26px; margin-bottom: 26px;
  box-shadow: 0 0 0 4px rgba(90,210,255,.10), 0 0 28px rgba(80,205,255,.30);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.hero-brand .hb-strong { color: #8fe8ff; font-weight: 800; font-size: 17px; }
.hero-brand .hb-x { color: #58e0c1; font-weight: 800; }
.hero h1 { color: #fff; font-size: clamp(32px, 4.6vw, 52px); font-weight: 800; margin-bottom: 20px; letter-spacing: .5px; }
.hero h1 .grad-text { background: linear-gradient(90deg, #5fd4ff, #58e0c1, #8ff2b0); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero p.sub { color: rgba(255,255,255,.9); font-size: clamp(15px, 1.6vw, 18px); max-width: 660px; margin-bottom: 34px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats { margin-top: 54px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; max-width: 820px; }
.hero-stat .num { font-size: clamp(28px, 3vw, 40px); font-weight: 800; color: #fff; }
.hero-stat .num em { font-style: normal; color: #58e0c1; }
.hero-stat .lbl { color: rgba(255,255,255,.72); font-size: 13.5px; margin-top: 2px; }

/* 页面内页 banner */
.page-hero {
  position: relative; color: #fff; overflow: hidden; text-align: center;
  background: linear-gradient(135deg, #081633 0%, #123a86 50%, #0d7f86 100%);
  padding: 84px 0 90px;
}
.page-hero .ph-bg { position: absolute; inset: 0; }
.page-hero .ph-bg img { width: 100%; height: 100%; object-fit: cover; opacity: .18; }
.page-hero .ph-bg::after { content: ""; position: absolute; inset: 0; background: linear-gradient(110deg, rgba(8,22,51,.9), rgba(12,60,120,.78)); }
.page-hero .container { position: relative; z-index: 2; }
.page-hero h1 { color: #fff; font-size: clamp(28px, 3.8vw, 44px); margin-bottom: 14px; }
.page-hero p { color: rgba(255,255,255,.88); max-width: 700px; margin: 0 auto; font-size: 16px; }
.crumb {
  display: inline-flex; gap: 8px; font-size: 13px; color: rgba(255,255,255,.7);
  background: rgba(255,255,255,.1); padding: 6px 14px; border-radius: 999px; margin-bottom: 20px;
}
.crumb a:hover { color: #fff; }

/* ---------- 卡片 ---------- */
.grid { display: grid; gap: 26px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }

.card {
  background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius);
  padding: 30px 28px; transition: .3s; box-shadow: var(--shadow-sm);
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: #c9dcff; }
.card .ico {
  width: 54px; height: 54px; border-radius: 14px; display: flex; align-items: center; justify-content: center;
  font-size: 24px; margin-bottom: 18px;
  background: linear-gradient(135deg, #e8efff, #e3fbf7); color: var(--c-blue);
}
.card h3 { font-size: 18px; margin-bottom: 10px; }
.card p { color: var(--c-muted); font-size: 14.5px; }
.card .tag { display: inline-block; font-size: 12px; font-weight: 600; color: var(--c-cyan); background: #e6faf8; padding: 3px 10px; border-radius: 999px; margin-bottom: 12px; }

/* 数字大卡 */
.stat-card { text-align: center; padding: 34px 20px; background: #fff; border-radius: var(--radius); box-shadow: var(--shadow-sm); border: 1px solid var(--c-border); }
.stat-card .num { font-size: clamp(30px, 3vw, 44px); font-weight: 800; color: var(--c-blue); line-height: 1.2; }
.stat-card .num em { font-style: normal; color: var(--c-cyan); }
.stat-card .lbl { color: var(--c-muted); margin-top: 6px; font-size: 14px; }

/* 编号步骤 */
.step-card { position: relative; }
.step-num {
  position: absolute; top: -6px; left: 24px; font-size: 64px; font-weight: 800; line-height: 1;
  color: transparent; -webkit-text-stroke: 1.5px #cdddfc;
}
.step-card .card { position: relative; }

/* ---------- 服务特性行 ---------- */
.feature-row { display: flex; gap: 18px; align-items: flex-start; padding: 20px 0; border-bottom: 1px dashed var(--c-border); }
.feature-row:last-child { border-bottom: none; }
.feature-row .f-ico { flex: none; width: 46px; height: 46px; border-radius: 12px; background: var(--grad-soft); color: var(--c-blue); display: flex; align-items: center; justify-content: center; font-size: 20px; }
.feature-row h4 { font-size: 16px; margin-bottom: 4px; }
.feature-row p { color: var(--c-muted); font-size: 14px; }

/* ---------- 时间线 ---------- */
.timeline { position: relative; padding-left: 30px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 4px; bottom: 4px; width: 2px; background: linear-gradient(#1e5ef3, #0fb7b0); }
.tl-item { position: relative; padding: 0 0 32px 26px; }
.tl-item::before { content: ""; position: absolute; left: -30px; top: 6px; width: 14px; height: 14px; border-radius: 50%; background: #fff; border: 3px solid var(--c-blue); }
.tl-item .year { font-weight: 800; font-size: 19px; color: var(--c-blue); margin-bottom: 6px; }
.tl-item .tl-body { color: var(--c-muted); font-size: 14.5px; }
.tl-item .tl-body .row { margin-bottom: 5px; }
.tl-item .tl-body b { color: var(--c-ink); }

/* ---------- 团队 ---------- */
.team-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.member {
  background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius); overflow: hidden;
  transition: .3s; box-shadow: var(--shadow-sm);
}
.member:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.member .m-photo { aspect-ratio: 1/1; overflow: hidden; background: #eef2fb; }
.member .m-photo img { width: 100%; height: 100%; object-fit: cover; transition: .4s; }
/* 证件照完整展示（不被方形容器裁切） */
.member .m-photo-fit { background: #fff; }
.member .m-photo-fit img { object-fit: contain; }
.member:hover .m-photo img { transform: scale(1.05); }
.member .m-body { padding: 16px 18px 20px; }
.member .m-name { font-weight: 700; font-size: 16.5px; color: var(--c-navy); }
.member .m-role { color: var(--c-cyan); font-size: 12.5px; font-weight: 600; margin: 3px 0 8px; }
.member .m-desc { color: var(--c-muted); font-size: 13px; }

/* 主理人卡片 */
.pi-card { display: flex; gap: 30px; align-items: center; background: #fff; border-radius: var(--radius-lg); padding: 34px; box-shadow: var(--shadow-md); border: 1px solid var(--c-border); }
.pi-card .pi-photo { flex: none; width: 200px; height: 200px; border-radius: 18px; overflow: hidden; }
.pi-card .pi-photo img { width: 100%; height: 100%; object-fit: cover; }
.pi-card h3 { font-size: 24px; margin-bottom: 6px; }
.pi-card .pi-role { color: var(--c-cyan); font-weight: 600; font-size: 14px; margin-bottom: 12px; }
.pi-card p { color: var(--c-muted); font-size: 14.5px; }

/* ---------- 合作机构 ---------- */
.partner-row { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; }
.partner-box {
  background: #fff; border: 1px solid var(--c-border); border-radius: 12px; padding: 22px 16px;
  display: flex; flex-direction: column; align-items: center; gap: 12px; transition: .3s;
}
.partner-box:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.partner-box img { max-height: 44px; max-width: 120px; object-fit: contain; }
.partner-box span { font-size: 13px; color: var(--c-muted); text-align: center; }

/* ---------- 图片+文字 ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.split .s-media { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg); }
.split .s-media img { width: 100%; height: 100%; object-fit: cover; min-height: 340px; }
/* 宽图完整展示（不被 cover 裁切） */
.split .s-media-fit img { height: auto; min-height: 0; object-fit: contain; }
.split .s-media-fit { background: var(--c-light); }
.split h2 { font-size: clamp(24px, 3vw, 34px); margin-bottom: 18px; }
.split p { color: var(--c-muted); margin-bottom: 16px; }
.split ul.ticks li { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 12px; color: var(--c-ink); font-size: 15px; }
.split ul.ticks li::before { content: "✓"; color: var(--c-cyan); font-weight: 800; flex: none; }

/* ---------- 新闻 / 案例 ---------- */
.news-card { display: flex; flex-direction: column; }
.news-card .n-media { aspect-ratio: 16/10; overflow: hidden; border-radius: 12px; margin-bottom: 16px; background: #eef2fb; }
.news-card .n-media img { width: 100%; height: 100%; object-fit: cover; transition: .4s; }
/* 宽图新闻卡：容器匹配 16:9 完整展示 */
.news-card .n-media-wide { aspect-ratio: 16/9; }
.news-card:hover .n-media img { transform: scale(1.05); }
.news-card .n-date { font-size: 12.5px; color: var(--c-cyan); font-weight: 600; margin-bottom: 8px; }
.news-card h3 { font-size: 17px; margin-bottom: 8px; }
.news-card h3 a:hover { color: var(--c-blue); }
.news-card p { color: var(--c-muted); font-size: 14px; }
.news-card .n-more { margin-top: auto; padding-top: 12px; color: var(--c-blue); font-weight: 600; font-size: 14px; }

/* ---------- 产品大卡 ---------- */
.product-card {
  position: relative; border-radius: var(--radius-lg); overflow: hidden; padding: 40px 36px; color: #fff;
  min-height: 300px; display: flex; flex-direction: column; justify-content: space-between; transition: .3s;
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.product-card .p-tag { font-size: 13px; font-weight: 600; letter-spacing: 1px; opacity: .85; }
.product-card h3 { color: #fff; font-size: 26px; margin: 8px 0 6px; }
.product-card .p-en { font-size: 13px; opacity: .8; letter-spacing: 1.5px; text-transform: uppercase; }
.product-card p { opacity: .92; font-size: 14.5px; margin: 14px 0 22px; }
.product-card .p-link { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; font-size: 15px; color: #fff; border-bottom: 2px solid rgba(255,255,255,.5); padding-bottom: 2px; }
.product-card.bg-blue { background: linear-gradient(140deg, #123a86, #1e5ef3 60%, #2f6df6); }
.product-card.bg-teal { background: linear-gradient(140deg, #0b6a70, #0fb7b0 62%, #17b37a); }
.product-card.bg-green { background: linear-gradient(140deg, #0d5f3c, #18a86b 60%, #2bc48a); }
.product-card.bg-navy { background: linear-gradient(140deg, #0a1b3d, #14305f); }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--c-border); border-radius: var(--radius); background: #fff; }
table.data { width: 100%; border-collapse: collapse; min-width: 720px; }
table.data th, table.data td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--c-border); font-size: 14.5px; vertical-align: top; }
table.data thead th { background: var(--c-navy); color: #fff; font-weight: 600; font-size: 14px; }
table.data tbody tr:nth-child(even) { background: #f7faff; }
table.data tbody tr:hover { background: #eef5ff; }
table.data td .ok { color: var(--c-green); font-weight: 700; }
table.data td .no { color: #d64545; font-weight: 700; }

/* ---------- 联系表单 ---------- */
.contact-layout { display: grid; grid-template-columns: 1fr 1.1fr; gap: 46px; align-items: start; }
.contact-info-box { background: var(--grad-brand); color: #fff; border-radius: var(--radius-lg); padding: 36px; }
.contact-info-box h3 { color: #fff; font-size: 22px; margin-bottom: 20px; }
.contact-info-box .ci-item { display: flex; gap: 14px; margin-bottom: 18px; align-items: flex-start; }
.contact-info-box .ci-item .ci-ico { flex: none; width: 42px; height: 42px; border-radius: 12px; background: rgba(255,255,255,.14); display: flex; align-items: center; justify-content: center; font-size: 18px; }
.contact-info-box .ci-item b { display: block; font-size: 15px; }
.contact-info-box .ci-item span { font-size: 13.5px; opacity: .85; }
.form-box { background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius-lg); padding: 36px; box-shadow: var(--shadow-sm); }
.form-box h3 { font-size: 21px; margin-bottom: 6px; }
.form-box .form-sub { color: var(--c-muted); font-size: 14px; margin-bottom: 24px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 18px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; color: var(--c-ink); margin-bottom: 7px; }
.form-group label .req { color: #d64545; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 12px 16px; border: 1.5px solid var(--c-border); border-radius: 10px;
  font-family: inherit; font-size: 15px; color: var(--c-ink); background: #fbfcff; transition: .2s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--c-blue); background: #fff; box-shadow: 0 0 0 3px rgba(30,94,243,.12);
}
.form-group textarea { resize: vertical; min-height: 110px; }
.form-tip { font-size: 12.5px; color: var(--c-muted); margin-top: 10px; }
.form-msg { display: none; margin-top: 14px; padding: 12px 16px; border-radius: 10px; font-size: 14px; }
.form-msg.ok { display: block; background: #e9fbf1; color: #0d7a45; }
.form-msg.err { display: block; background: #fdecec; color: #b02a2a; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--c-navy); color: rgba(255,255,255,.78); margin-top: 0; }
.footer-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; padding: 64px 0 44px; }
.footer-top h4 { color: #fff; font-size: 16px; margin-bottom: 18px; position: relative; padding-bottom: 10px; }
.footer-top h4::after { content: ""; position: absolute; left: 0; bottom: 0; width: 30px; height: 3px; border-radius: 2px; background: linear-gradient(90deg, var(--c-blue), var(--c-cyan)); }
.footer-about p { font-size: 13.5px; margin: 16px 0 20px; line-height: 1.9; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { font-size: 14px; transition: .2s; }
.footer-links a:hover { color: #58e0c1; padding-left: 4px; }
.footer-contact li { display: flex; gap: 10px; margin-bottom: 12px; font-size: 13.5px; align-items: flex-start; }
.footer-contact .fc-ico { color: #58e0c1; flex: none; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12); padding: 20px 0; display: flex; justify-content: space-between;
  align-items: center; gap: 14px; flex-wrap: wrap; font-size: 13px;
}
.footer-bottom a { color: #8fd8ff; }
.footer-bottom a:hover { text-decoration: underline; }

/* ---------- CTA 横幅 ---------- */
.cta-band { background: var(--grad-brand); color: #fff; padding: 70px 0; text-align: center; }
.cta-band h2 { color: #fff; font-size: clamp(24px, 3vw, 34px); margin-bottom: 14px; }
.cta-band p { color: rgba(255,255,255,.85); max-width: 640px; margin: 0 auto 28px; font-size: 15.5px; }

/* ---------- 404 ---------- */
.error-wrap { text-align: center; padding: 110px 20px; }
.error-code { font-size: clamp(90px, 16vw, 180px); font-weight: 800; line-height: 1; background: var(--grad-brand); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.error-wrap h2 { font-size: 28px; margin: 10px 0 12px; }
.error-wrap p { color: var(--c-muted); margin-bottom: 30px; }

/* ---------- 通用工具 ---------- */
.text-center { text-align: center; }
.mt-16 { margin-top: 16px; } .mt-24 { margin-top: 24px; } .mt-40 { margin-top: 40px; } .mt-64 { margin-top: 64px; }
.mb-24 { margin-bottom: 24px; } .mb-40 { margin-bottom: 40px; }
.grad-text { background: linear-gradient(90deg, #1e5ef3, #0fb7b0); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }

/* 滚动显现动画 */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* 顶部进度条（SEO 无关装饰） */
#backTop {
  position: fixed; right: 22px; bottom: 26px; width: 46px; height: 46px; border-radius: 50%;
  background: var(--grad-brand); color: #fff; border: none; cursor: pointer; font-size: 18px;
  box-shadow: var(--shadow-md); opacity: 0; visibility: hidden; transition: .3s; z-index: 90;
}
#backTop.show { opacity: 1; visibility: visible; }

/* =========================================================
   响应式：笔记本 1200 / 平板 992 / 手机 768 / 小屏 480
   ========================================================= */
@media (max-width: 1200px) {
  .team-grid { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-5 { grid-template-columns: repeat(3, 1fr); }
  .partner-row { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 992px) {
  .main-nav { position: fixed; top: 72px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--c-border); box-shadow: var(--shadow-md); transform: translateY(-130%); transition: .35s; }
  .main-nav.open { transform: none; }
  .main-nav ul { flex-direction: column; gap: 0; padding: 12px 20px 22px; }
  .main-nav a.nav-link { display: block; padding: 14px 10px; border-bottom: 1px solid #f0f4fc; border-radius: 0; }
  .nav-cta { margin: 14px 0 4px; }
  .nav-toggle { display: flex; }
  .main-nav .has-drop > a::after { display: none; }
  .main-nav .dropdown { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: none; padding: 0 0 4px 14px; }
  .main-nav .dropdown a { padding: 10px; }
  .grid-2, .split { grid-template-columns: 1fr; gap: 34px; }
  .hero-inner { padding: 84px 0 96px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 30px; }
  .contact-layout { grid-template-columns: 1fr; }
  .section { padding: 64px 0; }
}

@media (max-width: 768px) {
  .grid-3 { grid-template-columns: 1fr; }
  .grid-5 { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .pi-card { flex-direction: column; text-align: center; }
  .pi-card .pi-photo { width: 160px; height: 160px; }
  .form-row { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { justify-content: center; text-align: center; }
  .hero-actions .btn { width: 100%; }
}

@media (max-width: 480px) {
  .team-grid { grid-template-columns: 1fr; }
  .partner-row { grid-template-columns: repeat(2, 1fr); }
  .hero-stats { grid-template-columns: 1fr 1fr; gap: 16px; }
  .container { padding: 0 18px; }
}