/* ============================================================
   北京煜彤星禾科技有限公司 官网样式
   ============================================================ */
:root {
  --accent: #1e4fd8;
  --accent-dark: #153da8;
  --accent-light: #eef3fd;
  --ink: #101a2c;
  --ink-soft: #4b5768;
  --ink-mute: #8b95a5;
  --line: #e6eaf1;
  --bg-soft: #f6f8fb;
  --radius: 14px;
  --shadow: 0 10px 40px rgba(16, 26, 44, .08);
  --shadow-lg: 0 24px 70px rgba(16, 26, 44, .14);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: #fff;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

.container { width: min(1180px, 92%); margin: 0 auto; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand { display: flex; align-items: center; gap: 12px; }

.brand-mark {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), #4c86ff);
  color: #fff;
  display: grid; place-items: center;
  font-weight: 700; font-size: 17px;
  letter-spacing: .5px;
  flex: none;
}

.brand-text .brand-name { font-size: 17px; font-weight: 700; letter-spacing: .5px; }
.brand-text .brand-en { font-size: 11px; color: var(--ink-mute); letter-spacing: 1.5px; text-transform: uppercase; }

.nav-links { display: flex; align-items: center; gap: 6px; }

.nav-links a {
  padding: 8px 18px;
  border-radius: 999px;
  font-size: 15px;
  color: var(--ink-soft);
  transition: all .2s ease;
}

.nav-links a:hover { color: var(--accent); background: var(--accent-light); }
.nav-links a.active { color: var(--accent); font-weight: 600; }

.nav-actions { display: flex; align-items: center; gap: 14px; }

.btn-login {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 9px 22px;
  border-radius: 999px;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 14px;
  font-weight: 500;
  transition: all .2s ease;
}

.btn-login svg { width: 15px; height: 15px; }
.btn-login:hover { background: var(--accent); color: #fff; }

.nav-toggle {
  display: none;
  background: none; border: none; cursor: pointer;
  width: 40px; height: 40px; border-radius: 9px;
}

.nav-toggle svg { width: 22px; height: 22px; stroke: var(--ink); }

/* ---------- 通用区块 ---------- */
.section { padding: 96px 0; }
.section.soft { background: var(--bg-soft); }

.section-head { max-width: 680px; margin-bottom: 56px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.section-title { font-size: 34px; font-weight: 700; letter-spacing: 1px; line-height: 1.35; }
.section-desc { margin-top: 16px; color: var(--ink-soft); font-size: 16px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 34px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  transition: all .25s ease;
  cursor: pointer;
  border: none;
}

.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 10px 26px rgba(30, 79, 216, .3); }
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-2px); }
.btn-ghost { border: 1px solid var(--line); color: var(--ink); background: #fff; }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-white { background: #fff; color: var(--accent); }
.btn-white:hover { transform: translateY(-2px); box-shadow: var(--shadow); }

/* ---------- 首页 Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(1000px 520px at 85% -10%, rgba(76, 134, 255, .16), transparent 60%),
    radial-gradient(800px 500px at -10% 110%, rgba(30, 79, 216, .10), transparent 60%),
    #fff;
  padding: 120px 0 110px;
}

.hero-inner { display: grid; grid-template-columns: 1.15fr .85fr; gap: 64px; align-items: center; }

.hero-tag {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 16px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 999px;
  font-size: 13.5px;
  font-weight: 500;
  margin-bottom: 26px;
}

.hero-tag .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }

.hero h1 {
  font-size: 52px;
  line-height: 1.28;
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 24px;
}

.hero h1 .grad {
  background: linear-gradient(100deg, var(--accent), #4c86ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub { font-size: 17.5px; color: var(--ink-soft); max-width: 540px; margin-bottom: 40px; }

.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }

.hero-stats { display: flex; gap: 52px; margin-top: 58px; flex-wrap: wrap; }
.hero-stat .num { font-size: 34px; font-weight: 700; color: var(--accent); font-family: Georgia, serif; }
.hero-stat .num span { font-size: 20px; }
.hero-stat .label { font-size: 13.5px; color: var(--ink-mute); margin-top: 2px; }

/* Hero 视觉卡 */
.hero-visual { position: relative; }

.hero-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
  padding: 30px;
  position: relative;
  z-index: 2;
}

.hc-top { display: flex; gap: 7px; margin-bottom: 20px; }
.hc-top i { width: 11px; height: 11px; border-radius: 50%; display: block; }
.hc-top i:nth-child(1) { background: #ff6b6b; }
.hc-top i:nth-child(2) { background: #ffd43b; }
.hc-top i:nth-child(3) { background: #51cf66; }

.hc-bars { display: flex; align-items: flex-end; gap: 14px; height: 150px; padding: 0 6px; }
.hc-bar {
  flex: 1;
  border-radius: 8px 8px 3px 3px;
  background: linear-gradient(180deg, #4c86ff, var(--accent));
  opacity: .9;
}
.hc-bar:nth-child(odd) { background: linear-gradient(180deg, #9db9f5, #6d95ec); }
.hc-bar.b1 { height: 42%; } .hc-bar.b2 { height: 68%; } .hc-bar.b3 { height: 52%; }
.hc-bar.b4 { height: 88%; } .hc-bar.b5 { height: 64%; } .hc-bar.b6 { height: 95%; }

.hc-chip {
  position: absolute;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 13px 18px;
  display: flex; align-items: center; gap: 11px;
  font-size: 14px;
  z-index: 3;
}

.hc-chip .ico {
  width: 34px; height: 34px; border-radius: 9px;
  display: grid; place-items: center; flex: none;
}
.hc-chip .ico svg { width: 17px; height: 17px; }
.hc-chip .t { font-weight: 600; line-height: 1.3; }
.hc-chip .s { font-size: 12px; color: var(--ink-mute); }

.chip-a { top: -26px; right: -14px; }
.chip-b { bottom: -24px; left: -20px; }

/* ---------- 首页业务条 ---------- */
.business-strip { padding: 56px 0; border-bottom: 1px solid var(--line); }
.strip-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

.strip-item {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 26px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: #fff;
  transition: all .25s ease;
}
.strip-item:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: transparent; }

.strip-ico {
  width: 46px; height: 46px; border-radius: 12px; flex: none;
  background: var(--accent-light);
  color: var(--accent);
  display: grid; place-items: center;
}
.strip-ico svg { width: 22px; height: 22px; }
.strip-item h3 { font-size: 16.5px; font-weight: 600; margin-bottom: 6px; }
.strip-item p { font-size: 13.5px; color: var(--ink-mute); line-height: 1.65; }

/* ---------- 服务网格 ---------- */
.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }

.service-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 38px 32px;
  transition: all .25s ease;
  position: relative;
  overflow: hidden;
}
.service-card::after {
  content: "";
  position: absolute; inset: auto 0 0 0; height: 3px;
  background: linear-gradient(90deg, var(--accent), #4c86ff);
  transform: scaleX(0);
  transition: transform .3s ease;
  transform-origin: left;
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.service-card:hover::after { transform: scaleX(1); }

.service-num {
  font-family: Georgia, serif;
  font-size: 44px;
  font-weight: 700;
  color: var(--accent-light);
  -webkit-text-stroke: 1px #c9d8f8;
  position: absolute; top: 18px; right: 26px;
}

.service-ico {
  width: 54px; height: 54px; border-radius: 14px;
  background: linear-gradient(135deg, var(--accent), #4c86ff);
  color: #fff;
  display: grid; place-items: center;
  margin-bottom: 22px;
}
.service-ico svg { width: 26px; height: 26px; }
.service-card h3 { font-size: 19px; font-weight: 600; margin-bottom: 12px; }
.service-card p { font-size: 14.5px; color: var(--ink-soft); }
.service-card ul { margin-top: 16px; }
.service-card ul li {
  font-size: 13.5px; color: var(--ink-mute);
  padding: 5px 0 5px 22px; position: relative;
}
.service-card ul li::before {
  content: "";
  position: absolute; left: 0; top: 13px;
  width: 8px; height: 8px; border-radius: 2px;
  background: var(--accent); opacity: .5;
}

/* ---------- 数据带 ---------- */
.data-band {
  background: linear-gradient(120deg, #14265c, var(--accent-dark) 55%, #2a63e8);
  color: #fff;
  padding: 78px 0;
  position: relative;
  overflow: hidden;
}
.data-band::before {
  content: "";
  position: absolute;
  width: 520px; height: 520px; border-radius: 50%;
  background: rgba(255, 255, 255, .05);
  top: -260px; right: -120px;
}
.data-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; position: relative; }
.data-item .num { font-size: 46px; font-weight: 700; font-family: Georgia, serif; }
.data-item .num span { font-size: 24px; margin-left: 2px; }
.data-item .label { font-size: 14.5px; opacity: .78; margin-top: 4px; }

/* ---------- 案例卡片 ---------- */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }

.case-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  transition: all .25s ease;
  display: flex; flex-direction: column;
}
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }

.case-cover {
  height: 168px;
  display: grid; place-items: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.case-cover svg { width: 52px; height: 52px; opacity: .95; }
.case-cover::after {
  content: "";
  position: absolute;
  width: 190px; height: 190px; border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, .25);
  top: -70px; right: -60px;
}
.cc-1 { background: linear-gradient(135deg, #1e4fd8, #4c86ff); }
.cc-2 { background: linear-gradient(135deg, #0e9488, #34c3b5); }
.cc-3 { background: linear-gradient(135deg, #7c3aed, #a97bf5); }
.cc-4 { background: linear-gradient(135deg, #d97706, #f2a444); }
.cc-5 { background: linear-gradient(135deg, #be123c, #ee6b8c); }
.cc-6 { background: linear-gradient(135deg, #334155, #64748b); }

.case-body { padding: 26px 28px 30px; flex: 1; }
.case-body .tag {
  display: inline-block;
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-light);
  padding: 3px 12px;
  border-radius: 999px;
  margin-bottom: 12px;
  font-weight: 500;
}
.case-body h3 { font-size: 17.5px; font-weight: 600; margin-bottom: 8px; }
.case-body p { font-size: 14px; color: var(--ink-soft); }
.case-metric {
  margin-top: 18px; padding-top: 16px;
  border-top: 1px dashed var(--line);
  display: flex; align-items: baseline; gap: 10px;
}
.case-metric .v { font-size: 26px; font-weight: 700; color: var(--accent); font-family: Georgia, serif; }
.case-metric .k { font-size: 13px; color: var(--ink-mute); }

/* ---------- 流程 ---------- */
.flow-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.flow-step {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 28px;
  counter-increment: step;
}
.flow-step::before {
  content: "0" counter(step);
  font-family: Georgia, serif;
  font-size: 40px; font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px #b9c8e8;
  display: block;
  margin-bottom: 14px;
}
.flow-step h3 { font-size: 17px; font-weight: 600; margin-bottom: 8px; }
.flow-step p { font-size: 13.5px; color: var(--ink-mute); }

/* ---------- CTA ---------- */
.cta-panel {
  border-radius: 24px;
  background: linear-gradient(120deg, #14265c, var(--accent-dark));
  color: #fff;
  padding: 70px 60px;
  display: flex; align-items: center; justify-content: space-between; gap: 40px;
  position: relative; overflow: hidden;
}
.cta-panel::before {
  content: "";
  position: absolute;
  width: 420px; height: 420px; border-radius: 50%;
  background: rgba(76, 134, 255, .22);
  top: -200px; right: -100px;
}
.cta-panel h2 { font-size: 30px; font-weight: 700; letter-spacing: 1px; position: relative; }
.cta-panel p { margin-top: 12px; opacity: .82; position: relative; }
.cta-panel .btn { position: relative; flex: none; }

/* ---------- 页面 Hero（内页） ---------- */
.page-hero {
  background:
    radial-gradient(900px 400px at 80% -30%, rgba(76, 134, 255, .16), transparent 60%),
    linear-gradient(180deg, #f7f9fd, #fff);
  border-bottom: 1px solid var(--line);
  padding: 92px 0 80px;
}
.page-hero h1 { font-size: 40px; font-weight: 700; letter-spacing: 1.5px; }
.page-hero .sub { margin-top: 16px; color: var(--ink-soft); font-size: 16.5px; max-width: 640px; }
.crumb { font-size: 13.5px; color: var(--ink-mute); margin-bottom: 22px; }
.crumb a { color: var(--ink-mute); }
.crumb a:hover { color: var(--accent); }

/* ---------- 关于页 ---------- */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: center; }

.about-visual { position: relative; }
.about-frame {
  border-radius: 22px;
  background: linear-gradient(140deg, #14265c, var(--accent-dark));
  height: 420px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.about-frame .grid-lines {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .07) 1px, transparent 1px);
  background-size: 44px 44px;
}
.about-frame .ring {
  position: absolute; border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, .28);
}
.ring-1 { width: 300px; height: 300px; top: 60px; right: 40px; }
.ring-2 { width: 190px; height: 190px; top: 118px; right: 95px; border-style: dashed; }
.about-frame .core {
  position: absolute; width: 74px; height: 74px; border-radius: 20px;
  top: 177px; right: 153px;
  background: #fff; color: var(--accent-dark);
  display: grid; place-items: center;
  font-weight: 700; font-size: 20px;
  box-shadow: 0 14px 40px rgba(0, 0, 0, .3);
}
.about-frame .float-label {
  position: absolute;
  background: rgba(255, 255, 255, .94);
  border-radius: 999px;
  padding: 7px 16px;
  font-size: 12.5px; font-weight: 500; color: var(--ink-soft);
  box-shadow: var(--shadow);
}
.fl-1 { top: 54px; left: 34px; }
.fl-2 { bottom: 66px; right: 46px; }
.fl-3 { bottom: 34px; left: 60px; }

.about-text h2 { font-size: 30px; font-weight: 700; margin: 6px 0 20px; letter-spacing: 1px; }
.about-text p { color: var(--ink-soft); font-size: 15.5px; margin-bottom: 16px; }

.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.value-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 28px;
  transition: all .25s ease;
}
.value-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.value-card .ico {
  width: 48px; height: 48px; border-radius: 13px;
  background: var(--accent-light); color: var(--accent);
  display: grid; place-items: center; margin-bottom: 18px;
}
.value-card .ico svg { width: 23px; height: 23px; }
.value-card h3 { font-size: 17.5px; font-weight: 600; margin-bottom: 10px; }
.value-card p { font-size: 14px; color: var(--ink-soft); }

.timeline { position: relative; padding-left: 34px; }
.timeline::before {
  content: "";
  position: absolute; left: 8px; top: 6px; bottom: 6px;
  width: 2px; background: linear-gradient(180deg, var(--accent), #b9cffb);
}
.tl-item { position: relative; padding-bottom: 34px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: "";
  position: absolute; left: -32px; top: 7px;
  width: 14px; height: 14px; border-radius: 50%;
  background: #fff;
  border: 3px solid var(--accent);
}
.tl-item .year { font-family: Georgia, serif; font-size: 19px; font-weight: 700; color: var(--accent); }
.tl-item h3 { font-size: 16.5px; font-weight: 600; margin: 4px 0 6px; }
.tl-item p { font-size: 14px; color: var(--ink-soft); }

.tech-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.tech-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 30px;
  background: #fff;
}
.tech-card .lang { font-family: Georgia, serif; font-size: 22px; font-weight: 700; color: var(--accent); }
.tech-card h3 { font-size: 17px; font-weight: 600; margin: 6px 0 8px; }
.tech-card p { font-size: 14px; color: var(--ink-soft); }

/* ---------- 产品服务页 ---------- */
.prod-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }

.prod-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  display: flex; flex-direction: column;
  transition: all .25s ease;
}
.prod-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }

.prod-head { padding: 34px 36px 26px; display: flex; gap: 20px; align-items: flex-start; }
.prod-head .ico {
  width: 56px; height: 56px; border-radius: 15px; flex: none;
  background: linear-gradient(135deg, var(--accent), #4c86ff);
  color: #fff; display: grid; place-items: center;
}
.prod-head .ico svg { width: 27px; height: 27px; }
.prod-head h3 { font-size: 21px; font-weight: 700; letter-spacing: .5px; }
.prod-head .en { font-size: 12px; color: var(--ink-mute); letter-spacing: 2px; text-transform: uppercase; margin-top: 3px; }

.prod-feats {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--line);
  flex: 1;
}
.prod-feat { padding: 22px 24px 24px 36px; position: relative; border-bottom: 1px solid var(--line); }
.prod-feat:nth-child(odd) { border-right: 1px solid var(--line); }
.prod-feat:nth-last-child(1), .prod-feat:nth-last-child(2):nth-child(odd) { border-bottom: none; }
.prod-feat::before {
  content: "";
  position: absolute; left: 20px; top: 31px;
  width: 7px; height: 7px; border-radius: 2px;
  background: var(--accent);
}
.prod-feat h4 { font-size: 15px; font-weight: 600; }
.prod-feat p { font-size: 13px; color: var(--ink-mute); margin-top: 4px; line-height: 1.6; }

/* ---------- 联系页 ---------- */
.contact-wrap { display: grid; grid-template-columns: 1fr 1.05fr; gap: 60px; align-items: start; }

.contact-cards { display: grid; gap: 18px; }
.contact-card {
  display: flex; gap: 18px; align-items: flex-start;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 28px;
  background: #fff;
  transition: all .25s ease;
}
.contact-card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.contact-card .ico {
  width: 48px; height: 48px; border-radius: 13px; flex: none;
  background: var(--accent-light); color: var(--accent);
  display: grid; place-items: center;
}
.contact-card .ico svg { width: 22px; height: 22px; }
.contact-card h3 { font-size: 15px; color: var(--ink-mute); font-weight: 500; }
.contact-card .val { font-size: 17px; font-weight: 600; margin-top: 3px; word-break: break-all; }

.contact-form {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 44px 42px;
  box-shadow: var(--shadow);
}
.contact-form h3 { font-size: 22px; font-weight: 700; margin-bottom: 6px; }
.contact-form .tip { font-size: 14px; color: var(--ink-mute); margin-bottom: 28px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }

.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13.5px; font-weight: 600; margin-bottom: 7px; color: var(--ink); }
.field label .req { color: #e5484d; margin-left: 2px; }
.field input, .field select, .field textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 15px;
  font-size: 14.5px;
  font-family: var(--font);
  color: var(--ink);
  background: #fbfcfe;
  transition: all .2s ease;
  outline: none;
}
.field textarea { resize: vertical; min-height: 120px; }
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(30, 79, 216, .12);
  background: #fff;
}

.form-note { font-size: 12.5px; color: var(--ink-mute); margin-top: 14px; }

.form-success {
  display: none;
  background: #edfbf3;
  border: 1px solid #b5e5c8;
  color: #12734a;
  border-radius: 10px;
  padding: 14px 18px;
  font-size: 14px;
  margin-bottom: 20px;
}
.form-success.show { display: block; }

/* ---------- 页脚 ---------- */
.site-footer { background: #0d1a33; color: #97a4bd; padding: 70px 0 0; font-size: 14px; }

.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 48px; padding-bottom: 52px; }

.footer-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.footer-brand .brand-mark { background: linear-gradient(135deg, var(--accent), #4c86ff); }
.footer-brand .name { color: #fff; font-weight: 600; font-size: 17px; }

.site-footer .about-txt { line-height: 1.9; font-size: 13.5px; }

.footer-col h4 {
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 18px;
  letter-spacing: 1px;
}
.footer-col li { margin-bottom: 11px; }
.footer-col a { transition: color .2s ease; }
.footer-col a:hover { color: #fff; }

.footer-contact li { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 13px; }
.footer-contact svg { width: 16px; height: 16px; flex: none; margin-top: 4px; color: #6d88c4; }

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .08);
  padding: 22px 0;
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  flex-wrap: wrap;
  font-size: 13px;
}
.footer-bottom .links { display: flex; gap: 22px; align-items: center; }
.footer-bottom a:hover { color: #fff; }

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 28px; bottom: 28px;
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  display: grid; place-items: center;
  box-shadow: 0 10px 26px rgba(30, 79, 216, .35);
  cursor: pointer;
  opacity: 0; pointer-events: none;
  transition: all .25s ease;
  z-index: 90;
}
.back-top.show { opacity: 1; pointer-events: auto; }
.back-top:hover { transform: translateY(-3px); }
.back-top svg { width: 20px; height: 20px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { max-width: 520px; margin: 0 auto; }
  .strip-grid, .data-grid, .flow-grid { grid-template-columns: repeat(2, 1fr); }
  .service-grid, .case-grid, .value-grid, .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .prod-grid, .contact-wrap, .about-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .nav-links, .nav-actions .btn-login span { display: none; }
  .nav-toggle { display: grid; place-items: center; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: 72px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    padding: 14px 4%; align-items: stretch; gap: 2px;
  }
  .nav-links.open a { padding: 12px 16px; border-radius: 10px; }
  .hero { padding: 70px 0 60px; }
  .hero h1 { font-size: 34px; }
  .section { padding: 64px 0; }
  .section-title { font-size: 26px; }
  .strip-grid, .service-grid, .case-grid, .data-grid, .flow-grid,
  .value-grid, .tech-grid, .prod-feats, .form-row, .footer-grid { grid-template-columns: 1fr; }
  .cta-panel { flex-direction: column; text-align: center; padding: 50px 32px; }
  .contact-form { padding: 32px 24px; }
  .hero-stats { gap: 30px; }
}