/* 灵云智官网 2026 - 科技极简风（参考 Tesla / Apple）
   品牌绿 #85c02e | 深色 #0c1108 | 完全静态、无外部依赖 */
:root {
  --green: #85c02e;
  --green-dark: #5a8a1d;
  --green-deep: #405d16;
  --ink: #14170f;
  --ink-soft: #4b5140;
  --dark: #0c1108;
  --dark-2: #121a0b;
  --light: #ffffff;
  --light-2: #f5f7f1;
  --line: rgba(20, 23, 15, 0.12);
  --line-dark: rgba(255, 255, 255, 0.14);
  --font: -apple-system, BlinkMacSystemFont, "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: var(--light);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}
img { max-width: 100%; }
a { color: inherit; text-decoration: none; }

/* ===== 导航 ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(12, 17, 8, 0.82);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--line-dark);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  height: 60px; display: flex; align-items: center; justify-content: space-between;
}
.nav-logo { display: flex; align-items: center; gap: 10px; }
.nav-logo img { height: 26px; width: auto; display: block; }
.nav-logo .brand-cn { color: #fff; font-size: 15px; font-weight: 600; letter-spacing: 2px; }
.nav-links { display: flex; align-items: center; gap: 28px; list-style: none; }
.nav-links a {
  color: rgba(255, 255, 255, 0.82); font-size: 14px; font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--green); }
.nav-tel {
  color: #fff; font-size: 13px; font-weight: 600;
  border: 1px solid var(--line-dark); border-radius: 999px;
  padding: 6px 16px; transition: all 0.2s; white-space: nowrap;
}
.nav-tel:hover { border-color: var(--green); color: var(--green); }
.nav-toggle {
  display: none; background: none; border: none; cursor: pointer;
  width: 40px; height: 40px; padding: 8px;
}
.nav-toggle span {
  display: block; height: 2px; background: #fff; margin: 5px 0; border-radius: 2px;
}
@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; top: 60px; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: rgba(12, 17, 8, 0.97); padding: 12px 24px 20px;
    border-bottom: 1px solid var(--line-dark);
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: 12px 0; font-size: 15px; }
  .nav-tel { margin-top: 10px; display: inline-block; }
}

/* ===== 通用 section ===== */
.section { padding: 110px 24px; }
.section-dark { background: var(--dark); color: #fff; }
.section-dark-2 { background: var(--dark-2); color: #fff; }
.section-light { background: var(--light); color: var(--ink); }
.section-light-2 { background: var(--light-2); color: var(--ink); }
.wrap { max-width: 1200px; margin: 0 auto; }
.wrap-narrow { max-width: 860px; margin: 0 auto; }

.eyebrow {
  color: var(--green); font-size: 14px; font-weight: 600;
  letter-spacing: 4px; text-transform: uppercase; margin-bottom: 18px;
}
h1.hero-title {
  font-size: clamp(38px, 6vw, 68px); font-weight: 700;
  line-height: 1.15; letter-spacing: -0.5px; margin-bottom: 22px;
}
h2.section-title {
  font-size: clamp(30px, 4.4vw, 48px); font-weight: 700;
  line-height: 1.2; letter-spacing: -0.5px; margin-bottom: 20px;
}
.lead { font-size: clamp(16px, 2vw, 20px); color: var(--ink-soft); max-width: 720px; }
.section-dark .lead, .section-dark-2 .lead { color: rgba(255, 255, 255, 0.72); }

/* ===== Hero ===== */
.hero {
  min-height: 100vh; min-height: 100dvh;
  display: flex; align-items: center; justify-content: center;
  text-align: center; padding: 120px 24px 80px;
  background:
    radial-gradient(ellipse 80% 55% at 50% 115%, rgba(133, 192, 46, 0.28), transparent 65%),
    radial-gradient(ellipse 55% 40% at 82% -8%, rgba(133, 192, 46, 0.14), transparent 60%),
    var(--dark);
  color: #fff;
}
.hero-sub { font-size: clamp(16px, 2vw, 21px); color: rgba(255, 255, 255, 0.75); max-width: 640px; margin: 0 auto 40px; }
.hero-meta { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }
.hero-meta span {
  border: 1px solid var(--line-dark); border-radius: 999px;
  padding: 8px 20px; font-size: 14px; color: rgba(255, 255, 255, 0.85);
}
.hero-meta span b { color: var(--green); font-weight: 600; }
.scroll-hint {
  position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.45); font-size: 12px; letter-spacing: 3px;
}

/* ===== 按钮 ===== */
.btn-row { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 36px; }
.btn-row.center { justify-content: center; }
.btn {
  display: inline-block; padding: 14px 34px; border-radius: 999px;
  font-size: 15px; font-weight: 600; transition: all 0.2s; cursor: pointer;
}
.btn-green { background: var(--green); color: #0c1108; }
.btn-green:hover { background: #96d13c; }
.btn-ghost { border: 1px solid rgba(255, 255, 255, 0.4); color: #fff; }
.btn-ghost:hover { border-color: var(--green); color: var(--green); }
.btn-ghost-dark { border: 1px solid var(--ink); color: var(--ink); }
.btn-ghost-dark:hover { border-color: var(--green-dark); color: var(--green-dark); }

/* ===== 业务板块大卡片（首页） ===== */
.biz-panel { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.biz-panel.reverse > .biz-text { order: 2; }
@media (max-width: 900px) {
  .biz-panel { grid-template-columns: 1fr; gap: 36px; }
  .biz-panel.reverse > .biz-text { order: 0; }
}
.biz-num {
  font-size: 13px; font-weight: 700; letter-spacing: 3px;
  color: var(--green); margin-bottom: 14px;
}
.biz-text h3 { font-size: clamp(26px, 3.4vw, 40px); font-weight: 700; line-height: 1.25; margin-bottom: 16px; }
.biz-text p { color: var(--ink-soft); font-size: 16px; margin-bottom: 10px; }
.section-dark .biz-text p, .section-dark-2 .biz-text p { color: rgba(255, 255, 255, 0.72); }
.biz-points { list-style: none; margin: 20px 0 28px; }
.biz-points li {
  padding: 10px 0 10px 26px; position: relative; font-size: 15px;
  border-bottom: 1px solid var(--line);
}
.section-dark .biz-points li, .section-dark-2 .biz-points li { border-bottom-color: var(--line-dark); }
.biz-points li::before {
  content: ""; position: absolute; left: 0; top: 18px;
  width: 8px; height: 8px; border-radius: 50%; background: var(--green);
}
.biz-visual {
  border-radius: 20px; padding: 40px; min-height: 320px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(133, 192, 46, 0.06);
  border: 1px solid var(--line);
}
.section-dark .biz-visual, .section-dark-2 .biz-visual {
  background: rgba(133, 192, 46, 0.07); border-color: var(--line-dark);
}

/* ===== 网格卡片 ===== */
.grid { display: grid; gap: 20px; margin-top: 48px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }
.card {
  border: 1px solid var(--line); border-radius: 16px; padding: 30px 26px;
  background: var(--light); transition: transform 0.25s, box-shadow 0.25s;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 16px 40px rgba(12, 17, 8, 0.08); }
.section-dark .card, .section-dark-2 .card {
  background: rgba(255, 255, 255, 0.04); border-color: var(--line-dark);
}
.card:hover { border-color: var(--green); }
.card h4 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.card p { font-size: 14px; color: var(--ink-soft); }
.section-dark .card p, .section-dark-2 .card p { color: rgba(255, 255, 255, 0.68); }
.card .icon { margin-bottom: 18px; }

/* ===== 数字条 ===== */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
@media (max-width: 700px) { .stats { grid-template-columns: repeat(2, 1fr); } }
.stat .num { font-size: clamp(34px, 4.6vw, 52px); font-weight: 700; color: var(--green); line-height: 1.1; }
.stat .label { font-size: 14px; color: var(--ink-soft); margin-top: 8px; }
.section-dark .stat .label, .section-dark-2 .stat .label { color: rgba(255, 255, 255, 0.65); }

/* ===== 客户墙 ===== */
.clients { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; margin-top: 48px; }
@media (max-width: 900px) { .clients { grid-template-columns: repeat(2, 1fr); } }
.client-cell {
  background: var(--light); padding: 30px 16px; text-align: center;
  font-size: 15px; font-weight: 600; color: var(--ink-soft);
  display: flex; align-items: center; justify-content: center; min-height: 84px;
  transition: color 0.2s, background 0.2s;
}
.client-cell:hover { color: var(--green-dark); background: var(--light-2); }

/* ===== 案例卡 ===== */
.case-card {
  border: 1px solid var(--line); border-radius: 18px; overflow: hidden;
  background: var(--light); display: flex; flex-direction: column;
}
.case-head {
  padding: 26px 26px 22px; color: #fff;
  background: linear-gradient(135deg, var(--green-deep), #1d2a10);
}
.case-head .industry { font-size: 12px; letter-spacing: 2px; color: var(--green); font-weight: 600; margin-bottom: 8px; }
.case-head h4 { font-size: 19px; font-weight: 700; line-height: 1.4; }
.case-body { padding: 24px 26px 28px; flex: 1; }
.case-body h5 { font-size: 13px; color: var(--green-dark); letter-spacing: 1px; margin: 14px 0 6px; font-weight: 700; }
.case-body h5:first-child { margin-top: 0; }
.case-body p, .case-body li { font-size: 14px; color: var(--ink-soft); }
.case-body ul { padding-left: 18px; }

/* ===== 流程步骤 ===== */
.flow { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 48px; }
@media (max-width: 800px) { .flow { grid-template-columns: 1fr; } }
.flow-step { position: relative; padding: 34px 28px; border: 1px solid var(--line-dark); border-radius: 16px; background: rgba(255, 255, 255, 0.03); }
.flow-step .step-num {
  font-size: 44px; font-weight: 800; color: transparent;
  -webkit-text-stroke: 1.5px var(--green); line-height: 1; margin-bottom: 16px;
}
.flow-step h4 { font-size: 20px; font-weight: 700; margin-bottom: 10px; color: #fff; }
.flow-step p { font-size: 14px; color: rgba(255, 255, 255, 0.68); }

/* ===== 联系 ===== */
.contact-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 60px; align-items: center; }
@media (max-width: 800px) { .contact-grid { grid-template-columns: 1fr; gap: 36px; } }
.contact-item { display: flex; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--line); align-items: flex-start; }
.contact-item:last-child { border-bottom: none; }
.contact-item .k { font-size: 13px; color: var(--ink-soft); letter-spacing: 2px; min-width: 64px; padding-top: 3px; }
.contact-item .v { font-size: 17px; font-weight: 600; }
.qr-box { text-align: center; }
.qr-box img { width: 168px; height: 178px; object-fit: contain; border: 1px solid var(--line); border-radius: 12px; padding: 8px; background: #fff; }
.qr-box .cap { font-size: 13px; color: var(--ink-soft); margin-top: 12px; }

/* ===== 页脚 ===== */
.footer { background: #070a04; color: rgba(255, 255, 255, 0.6); padding: 56px 24px 32px; font-size: 13px; }
.footer-inner { max-width: 1200px; margin: 0 auto; }
.footer-top { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; padding-bottom: 36px; border-bottom: 1px solid var(--line-dark); }
.footer-brand img { height: 24px; margin-bottom: 14px; }
.footer-brand p { max-width: 320px; line-height: 1.8; }
.footer-col h5 { color: #fff; font-size: 14px; font-weight: 600; margin-bottom: 16px; letter-spacing: 1px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a:hover { color: var(--green); }
.footer-bottom { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding-top: 24px; }
.footer-bottom a { color: rgba(255, 255, 255, 0.6); }
.footer-bottom a:hover { color: var(--green); }

/* ===== 子页头 ===== */
.page-hero {
  padding: 170px 24px 100px; text-align: center;
  background:
    radial-gradient(ellipse 70% 60% at 50% 120%, rgba(133, 192, 46, 0.22), transparent 65%),
    var(--dark);
  color: #fff;
}
.page-hero .lead { margin: 0 auto; }
.page-hero.bg-lingyun {
  background:
    linear-gradient(rgba(12, 17, 8, 0.86), rgba(12, 17, 8, 0.95)),
    url('../img/lingyun-visual.jpg') center 30% / cover no-repeat,
    var(--dark);
}
.page-hero.bg-fde {
  background:
    linear-gradient(rgba(12, 17, 8, 0.86), rgba(12, 17, 8, 0.95)),
    url('../img/fde-visual.jpg') center 30% / cover no-repeat,
    var(--dark);
}

/* ===== 特征图 ===== */
.img-feature {
  width: 100%; height: auto; display: block; margin-top: 40px;
  border-radius: 18px; border: 1px solid var(--line-dark);
}
.img-feature.light-border { border-color: var(--line); }
/* 收窄居中的特征图：避免满宽大图压过正文 */
.img-feature.contained { max-width: 760px; margin-left: auto; margin-right: auto; }
.img-feature.contained-sm { max-width: 520px; margin-left: auto; margin-right: auto; }
@media (max-width: 800px) {
  .img-feature.contained, .img-feature.contained-sm { max-width: 100%; }
}

/* 图文面板中的图片：限高居中裁剪，避免随文字拉成细长条 */
.biz-visual.img-fill {
  padding: 0; overflow: hidden; min-height: 0;
  align-self: center; display: block; width: 100%;
}
.biz-visual.img-fill img {
  width: 100%; height: auto; max-height: 400px;
  object-fit: cover; display: block; border-radius: 20px;
}

/* ===== 校企合作 ===== */
.edu-facts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 40px; }
@media (max-width: 800px) { .edu-facts { grid-template-columns: repeat(2, 1fr); } }
.edu-fact {
  border: 1px solid var(--line); border-radius: 14px; padding: 22px 18px; text-align: center;
}
.edu-fact .n { font-size: 30px; font-weight: 700; color: var(--green-dark); line-height: 1.1; }
.edu-fact .t { font-size: 13px; color: var(--ink-soft); margin-top: 6px; }

/* ===== 时间线（关于我们） ===== */
.values { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 48px; }
@media (max-width: 800px) { .values { grid-template-columns: 1fr; } }
.value-card { text-align: center; padding: 40px 24px; border: 1px solid var(--line); border-radius: 16px; }
.value-card .v-title { font-size: 22px; font-weight: 700; margin-bottom: 12px; color: var(--green-deep); }
.value-card p { font-size: 14px; color: var(--ink-soft); }

.cert-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-top: 40px; }
@media (max-width: 700px) { .cert-list { grid-template-columns: 1fr; } }
.cert-item {
  display: flex; align-items: center; gap: 12px; padding: 18px 22px;
  border: 1px solid var(--line); border-radius: 12px; font-size: 15px; font-weight: 600;
}
.cert-item::before { content: ""; width: 10px; height: 10px; border-radius: 50%; background: var(--green); flex-shrink: 0; }