/* ============ 奕通信息 新官网 全局样式 ============ */
:root {
  --primary: #0d3b8f;
  --primary-2: #1a56c4;
  --accent: #00b3a4;
  --ink: #10233f;
  --muted: #5b6b83;
  --line: #e3e9f2;
  --bg: #f6f8fb;
  --card: #ffffff;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(16, 35, 63, .07);
  --shadow-lg: 0 14px 40px rgba(16, 35, 63, .13);
  --maxw: 1180px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", -apple-system, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand img { height: 34px; width: auto; }
.brand .brand-text { line-height: 1.2; }
.brand .brand-name { font-size: 18px; font-weight: 700; color: var(--primary); letter-spacing: .5px; }
.brand .brand-sub { font-size: 11px; color: var(--muted); letter-spacing: 1px; }

.nav { display: flex; align-items: center; gap: 6px; }
.nav a {
  padding: 8px 16px; border-radius: 8px;
  font-size: 15px; color: var(--ink); font-weight: 500;
  transition: all .2s;
}
.nav a:hover, .nav a.active { color: var(--primary-2); background: rgba(26, 86, 196, .08); }

.nav-toggle {
  display: none; background: none; border: none; cursor: pointer;
  width: 40px; height: 40px; flex-direction: column; justify-content: center; gap: 5px; align-items: center;
}
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: .2s; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 28px; border-radius: 10px;
  font-size: 15px; font-weight: 600; cursor: pointer;
  transition: all .22s; border: 2px solid transparent;
}
.btn-primary { background: linear-gradient(135deg, var(--primary-2), var(--primary)); color: #fff; box-shadow: 0 8px 20px rgba(26, 86, 196, .28); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(26, 86, 196, .36); }
.btn-ghost { border-color: rgba(255, 255, 255, .7); color: #fff; }
.btn-ghost:hover { background: rgba(255, 255, 255, .14); }
.btn-outline { border-color: var(--primary-2); color: var(--primary-2); }
.btn-outline:hover { background: var(--primary-2); color: #fff; }

/* ---------- Hero (首页) ---------- */
.hero {
  position: relative; color: #fff;
  padding: 110px 0 120px;
  background: linear-gradient(120deg, #07255e 0%, #0d3b8f 55%, #1253b8 100%);
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background: url("../img/platform_1.png") center/cover no-repeat;
  opacity: .28;
}
.hero-inner { position: relative; z-index: 2; max-width: 860px; }
.hero-kicker {
  display: inline-block; padding: 6px 16px; border-radius: 999px;
  background: rgba(0, 179, 164, .18); border: 1px solid rgba(0, 179, 164, .5);
  color: #7df0e5; font-size: 13px; letter-spacing: 2px; margin-bottom: 22px;
}
.hero h1 { font-size: 46px; line-height: 1.25; font-weight: 700; margin-bottom: 18px; }
.hero h1 em { font-style: normal; color: #4de3d5; }
.hero p { font-size: 18px; color: rgba(255, 255, 255, .85); margin-bottom: 36px; max-width: 640px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* ---------- Stats ---------- */
.stats-band {
  background: #fff; border-bottom: 1px solid var(--line);
  padding: 0;
}
.stats-grid {
  display: grid; grid-template-columns: repeat(5, 1fr);
}
.stat-item {
  text-align: center; padding: 30px 12px;
  border-right: 1px solid var(--line);
}
.stat-item:last-child { border-right: none; }
.stat-num { font-size: 30px; font-weight: 800; color: var(--primary); line-height: 1.2; }
.stat-num small { font-size: 15px; font-weight: 600; }
.stat-label { font-size: 13px; color: var(--muted); margin-top: 6px; }

/* ---------- Sections ---------- */
.section { padding: 84px 0; }
.section.alt { background: #fff; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 52px; }
.kicker {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 3px;
  color: var(--accent); text-transform: uppercase; margin-bottom: 10px;
}
.section-head h2 { font-size: 32px; font-weight: 700; margin-bottom: 14px; }
.section-head p { color: var(--muted); font-size: 16px; }

/* ---------- Platform (首页) ---------- */
.platform-feature {
  display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center;
}
.platform-feature .shot {
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-lg);
  border: 1px solid var(--line);
}
.platform-feature h2 { font-size: 30px; margin-bottom: 14px; }
.platform-feature .lead { color: var(--muted); margin-bottom: 26px; }
.cap-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.cap-item {
  background: var(--bg); border: 1px solid var(--line); border-radius: 12px;
  padding: 20px 20px 18px; transition: all .22s;
}
.cap-item:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: rgba(26, 86, 196, .3); }
.cap-item .cap-ico {
  width: 40px; height: 40px; border-radius: 10px; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, rgba(26,86,196,.12), rgba(0,179,164,.12));
  font-size: 20px; margin-bottom: 12px;
}
.cap-item h3 { font-size: 16px; margin-bottom: 6px; }
.cap-item p { font-size: 13.5px; color: var(--muted); line-height: 1.6; }

/* ---------- Solution cards ---------- */
.sol-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.sol-card {
  background: var(--card); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); transition: all .25s; display: flex; flex-direction: column;
  border: 1px solid var(--line);
}
.sol-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.sol-card .thumb { position: relative; aspect-ratio: 16/9; overflow: hidden; background: #dbe5f3; }
.sol-card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.sol-card:hover .thumb img { transform: scale(1.06); }
.sol-card .thumb .tag {
  position: absolute; top: 12px; left: 12px;
  background: rgba(13, 59, 143, .88); color: #fff;
  font-size: 12px; padding: 4px 12px; border-radius: 999px;
}
.sol-card .body { padding: 20px 20px 22px; flex: 1; display: flex; flex-direction: column; }
.sol-card h3 { font-size: 18px; margin-bottom: 8px; }
.sol-card p { font-size: 13.5px; color: var(--muted); flex: 1; }
.sol-card .more { margin-top: 14px; font-size: 14px; font-weight: 600; color: var(--primary-2); }
.sol-card:hover .more { color: var(--accent); }

/* ---------- Clients ---------- */
.client-wall {
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px;
}
.client-cell {
  background: #fff; border: 1px solid var(--line); border-radius: 10px;
  text-align: center; padding: 18px 8px; font-weight: 600; color: var(--ink);
  font-size: 14.5px; transition: all .2s;
}
.client-cell small { display: block; font-size: 11.5px; color: var(--muted); font-weight: 400; margin-top: 2px; }
.client-cell:hover { border-color: var(--primary-2); color: var(--primary-2); box-shadow: var(--shadow); }

/* ---------- Partner band ---------- */
.partner-band {
  margin-top: 18px; display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  background: #fff; border: 1px solid var(--line); border-radius: 10px;
  padding: 14px 22px;
}
.partner-label {
  font-size: 12px; letter-spacing: 2px; color: var(--accent); font-weight: 700;
  text-transform: uppercase; padding-right: 16px; border-right: 1px solid var(--line);
}
.partner-item {
  font-size: 17px; font-weight: 700; color: var(--primary);
}
.partner-note { font-size: 13px; color: var(--muted); margin-left: auto; }

/* ---------- Certs ---------- */
.cert-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.cert-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; display: flex; gap: 18px; align-items: flex-start;
  transition: all .22s;
}
.cert-card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.cert-card .ico {
  flex: none; width: 52px; height: 52px; border-radius: 12px;
  background: linear-gradient(135deg, var(--primary-2), var(--accent));
  display: flex; align-items: center; justify-content: center; font-size: 24px; color: #fff;
}
.cert-card h3 { font-size: 17px; margin-bottom: 6px; }
.cert-card p { font-size: 13.5px; color: var(--muted); }

/* ---------- CTA band ---------- */
.cta-band {
  background: linear-gradient(120deg, #07255e, #0d3b8f 60%, #0f5aa8);
  color: #fff; text-align: center; padding: 72px 0;
}
.cta-band h2 { font-size: 30px; margin-bottom: 12px; }
.cta-band p { color: rgba(255, 255, 255, .8); margin-bottom: 30px; }

/* ---------- Page hero (子页) ---------- */
.page-hero {
  position: relative; color: #fff; padding: 72px 0 84px;
  background: linear-gradient(120deg, #07255e, #0d3b8f 60%, #1253b8);
  overflow: hidden;
}
.page-hero .hero-bg { opacity: .22; }
.page-hero .crumbs {
  position: relative; z-index: 2; font-size: 13px; color: rgba(255,255,255,.7); margin-bottom: 16px;
}
.page-hero .crumbs a:hover { color: #fff; }
.page-hero h1 { position: relative; z-index: 2; font-size: 36px; margin-bottom: 12px; }
.page-hero .sub { position: relative; z-index: 2; font-size: 16.5px; color: rgba(255,255,255,.85); max-width: 720px; }

/* ---------- 通用内容组件 ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-grid.two { grid-template-columns: repeat(2, 1fr); }
.feature-grid.four { grid-template-columns: repeat(4, 1fr); }
.feature-grid.five { grid-template-columns: repeat(5, 1fr); }
.feature-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 26px; transition: all .22s;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.feature-card .num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 42px; height: 42px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-2), var(--primary)); color: #fff;
  font-weight: 700; font-size: 17px; margin-bottom: 16px;
}
.feature-card h3 { font-size: 17.5px; margin-bottom: 10px; }
.feature-card p { font-size: 14px; color: var(--muted); }
.feature-card ul { margin-top: 10px; }
.feature-card ul li {
  font-size: 14px; color: var(--muted); padding: 5px 0 5px 22px; position: relative;
}
.feature-card ul li::before {
  content: ""; position: absolute; left: 2px; top: 12px;
  width: 8px; height: 8px; border-radius: 2px; background: var(--accent);
}

.case-focus {
  margin-top: 18px; padding: 18px 20px; border-left: 4px solid var(--primary-2);
  background: linear-gradient(135deg, rgba(0,179,164,.06), rgba(13,59,143,.04));
  border-radius: 0 10px 10px 0;
}
.case-focus .cf-tag {
  display: inline-block; font-size: 11px; font-weight: 700; letter-spacing: .5px;
  color: var(--primary-2); background: rgba(0,179,164,.12);
  padding: 2px 9px; border-radius: 20px; margin-bottom: 8px;
}
.case-focus h4 { font-size: 16px; color: var(--primary); margin-bottom: 8px; }
.case-focus p { font-size: 13.5px; color: var(--ink); margin-bottom: 8px; }
.case-focus ul { margin: 0; }
.case-focus ul li { font-size: 13.5px; color: var(--ink); padding: 4px 0 4px 20px; }
.case-focus ul li::before { background: var(--primary-2); }

.shot-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; margin-top: 46px; }
.shot-row img {
  width: 100%; border-radius: var(--radius); border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.shot-row.three { grid-template-columns: repeat(3, 1fr); }
.shot-row.single { grid-template-columns: 1fr; }
.shot-row.single img { max-width: 720px; margin: 0 auto; }

.split {
  display: grid; grid-template-columns: 1fr 1fr; gap: 52px; align-items: center;
}
.split .shot { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); box-shadow: var(--shadow-lg); }

.step-flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: step; }
.step {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 22px; position: relative; counter-increment: step;
}
.step::before {
  content: "0" counter(step);
  font-size: 34px; font-weight: 800; color: rgba(26, 86, 196, .16);
  position: absolute; top: 12px; right: 16px;
}
.step h3 { font-size: 16.5px; margin-bottom: 8px; color: var(--primary); }
.step p { font-size: 13.5px; color: var(--muted); }

.tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.tag-cloud span {
  padding: 7px 18px; border-radius: 999px; font-size: 14px;
  background: #fff; border: 1px solid var(--line); color: var(--ink);
}
.tag-cloud span.hl { background: rgba(0, 179, 164, .1); border-color: rgba(0, 179, 164, .4); color: #00857a; font-weight: 600; }

.quote-band {
  background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--accent);
  border-radius: 10px; padding: 22px 28px; font-size: 16px; color: var(--ink);
  box-shadow: var(--shadow); margin-top: 40px;
}

/* ---------- About 页 ---------- */
.about-lead { font-size: 17px; color: var(--ink); max-width: 900px; margin: 0 auto; }
.timeline { position: relative; max-width: 780px; margin: 0 auto; padding-left: 26px; }
.timeline::before {
  content: ""; position: absolute; left: 6px; top: 6px; bottom: 6px;
  width: 2px; background: linear-gradient(var(--primary-2), var(--accent));
}
.tl-item { position: relative; padding: 0 0 30px 24px; }
.tl-item::before {
  content: ""; position: absolute; left: -26px; top: 7px;
  width: 14px; height: 14px; border-radius: 50%;
  background: #fff; border: 3px solid var(--primary-2);
}
.tl-item .year { font-weight: 800; color: var(--primary); font-size: 17px; }
.tl-item h3 { font-size: 16px; margin: 2px 0 4px; }
.tl-item p { font-size: 14px; color: var(--muted); }

.value-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.value-card {
  background: #fff; border-radius: var(--radius); border: 1px solid var(--line);
  padding: 26px 22px; text-align: center; transition: all .22s;
}
.value-card:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.value-card .vname { font-size: 18px; font-weight: 700; color: var(--primary); margin-bottom: 10px; letter-spacing: 2px; }
.value-card p { font-size: 13.5px; color: var(--muted); }

/* ---------- Contact 页 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; }
.contact-info-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 34px 30px; box-shadow: var(--shadow);
}
.contact-info-card h3 { font-size: 19px; margin-bottom: 20px; color: var(--primary); }
.contact-line { display: flex; gap: 14px; padding: 13px 0; border-bottom: 1px dashed var(--line); align-items: flex-start; }
.contact-line:last-child { border-bottom: none; }
.contact-line .ico { font-size: 20px; }
.contact-line .k { font-size: 13px; color: var(--muted); }
.contact-line .v { font-size: 15.5px; font-weight: 600; }
.contact-form {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 34px 30px; box-shadow: var(--shadow);
}
.form-row { margin-bottom: 18px; }
.form-row label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 7px; }
.form-row input, .form-row textarea, .form-row select {
  width: 100%; padding: 11px 14px; border: 1px solid var(--line); border-radius: 9px;
  font-size: 15px; font-family: inherit; background: var(--bg); color: var(--ink);
  transition: border .2s;
}
.form-row input:focus, .form-row textarea:focus, .form-row select:focus {
  outline: none; border-color: var(--primary-2); background: #fff;
}
.form-note { font-size: 12.5px; color: var(--muted); margin-top: 10px; }

/* ---------- 产品中心页 ---------- */
.cat-chips-bar {
  background: #fff; border-bottom: 1px solid var(--line);
  padding: 16px 0; position: sticky; top: 68px; z-index: 50;
}
.cat-chips { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.cat-chips a {
  padding: 8px 20px; border-radius: 999px; background: var(--bg);
  border: 1px solid var(--line); font-size: 14.5px; font-weight: 500;
  color: var(--ink); transition: all .2s;
}
.cat-chips a:hover {
  border-color: var(--primary-2); color: var(--primary-2);
  background: #fff; box-shadow: var(--shadow);
}
section[id] { scroll-margin-top: 130px; }
.feature-card.product h3 { color: var(--primary); }
.feature-card.product .model {
  display: inline-block; font-size: 12.5px; font-weight: 700;
  color: #00857a; letter-spacing: .5px; margin-bottom: 8px;
}

/* ---------- FAQ ---------- */
.faq-list { display: grid; gap: 14px; max-width: 900px; margin: 0 auto; }
.faq-item { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 24px; transition: box-shadow .25s, border-color .25s; }
.faq-item h3 { font-size: 17px; color: var(--primary); margin: 0 0 8px; }
.faq-item p { margin: 0; color: var(--muted); font-size: 14.5px; line-height: 1.85; }
.faq-item:hover { box-shadow: var(--shadow); border-color: var(--primary-2); }

/* ---------- Footer ---------- */
.site-footer { background: #0a1c38; color: rgba(255,255,255,.78); padding: 60px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 44px; }
.site-footer h4 { color: #fff; font-size: 16px; margin-bottom: 16px; }
.site-footer p { font-size: 13.5px; line-height: 1.9; }
.site-footer ul li { padding: 4px 0; font-size: 13.5px; }
.site-footer ul a:hover { color: #4de3d5; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-brand img { height: 30px; }
.footer-brand span { color: #fff; font-weight: 700; font-size: 17px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding: 18px 0; font-size: 12.5px; color: rgba(255,255,255,.45);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
}

/* ---------- 动画 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: all .7s cubic-bezier(.2,.65,.3,1); }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .sol-grid { grid-template-columns: repeat(2, 1fr); }
  .client-wall { grid-template-columns: repeat(4, 1fr); }
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .stat-item:nth-child(3) { border-right: none; }
  .feature-grid, .feature-grid.four, .feature-grid.five, .value-grid { grid-template-columns: repeat(2, 1fr); }
  .platform-feature, .split, .contact-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav {
    position: absolute; top: 68px; left: 0; right: 0;
    background: #fff; flex-direction: column; align-items: stretch;
    padding: 10px 18px 16px; border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-lg); display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: 12px 14px; }
  .nav-toggle { display: flex; }
  .hero { padding: 72px 0 80px; }
  .hero h1 { font-size: 32px; }
  .section { padding: 56px 0; }
  .section-head h2 { font-size: 25px; }
  .sol-grid, .feature-grid, .feature-grid.two, .feature-grid.four, .feature-grid.five, .value-grid, .cert-grid, .shot-row, .shot-row.three { grid-template-columns: 1fr; }
  .step-flow { grid-template-columns: 1fr 1fr; }
  .client-wall { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat-item { border-right: none; border-bottom: 1px solid var(--line); }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
  .page-hero h1 { font-size: 27px; }
}