/* ============================================================
   国源测绘官网 — Lusion 风格设计系统 (P0)
   白底 + 电光蓝 + 克制圆角 + 等宽标注
   设计来源: research/lusion_co/探索报告_lusion技术栈与国源转化方案.md
   ============================================================ */

/* ---------- 1. Design Tokens ---------- */
:root {
  /* 色彩 */
  --c-white: #ffffff;
  --c-off-white: #f0f1fa;
  --c-dark-white: #e4e6ef;
  --c-blue: #1a2ffb;          /* 电光蓝 主色 */
  --c-dark-blue: #071bdf;     /* 深蓝 hover */
  --c-grey-blue: #2b2e3a;     /* 正文深灰蓝 */
  --c-green: #c1ff00;         /* 荧光绿 点缀/状态 */
  --c-red: #ff4c41;

  /* 字体 */
  --font-display: 'Space Grotesk', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;

  /* 布局 */
  --grid-gap: 4vw;
  --base-padding: 25px;
  --radius: 10px;
  --header-size: clamp(1rem, 1vw, 2rem);

  /* 动效 */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur: 0.6s;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--c-white);
  color: var(--c-grey-blue);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: var(--c-blue); color: #fff; }

/* ---------- 2. 等宽标注标签 ---------- */
.mono-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-blue);
}

.mono-tag--grey { color: #9aa0b5; }

/* ---------- 3. 超大标题 ---------- */
.display-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.5rem, 8vw, 7rem);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--c-grey-blue);
}

.display-title .accent { color: var(--c-blue); }

/* ---------- 4. Header 全屏大字导航 ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-dark-white);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px var(--base-padding);
  max-width: 100%;
}

.logo { display: flex; align-items: center; gap: 12px; text-decoration: none; }

.logo-mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--c-blue);
  background: var(--c-off-white);
  border: 1px solid var(--c-dark-white);
  border-radius: var(--radius);
  padding: 6px 12px;
  letter-spacing: 0.1em;
}

.logo-text strong {
  font-family: var(--font-display);
  font-size: 0.95rem;
  color: var(--c-grey-blue);
  display: block;
  line-height: 1.2;
}

.logo-text small {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  color: #9aa0b5;
  letter-spacing: 0.08em;
}

.main-nav {
  display: flex;
  gap: clamp(14px, 2.5vw, 36px);
}

.main-nav a {
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--c-grey-blue);
  text-decoration: none;
  position: relative;
  padding: 4px 0;
  transition: color var(--dur) var(--ease-out);
}

.main-nav a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 2px;
  background: var(--c-blue);
  transition: width var(--dur) var(--ease-out);
}

.main-nav a:hover,
.main-nav a.active { color: var(--c-blue); }

.main-nav a:hover::after,
.main-nav a.active::after { width: 100%; }

/* ---------- 5. Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 120px var(--base-padding) 80px;
  overflow: hidden;
}

.hero-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: #9aa0b5;
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.8rem, 9vw, 8rem);
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--c-grey-blue);
  max-width: 12em;
}

.hero-title .accent { color: var(--c-blue); }

.hero-sub {
  margin-top: 32px;
  font-size: clamp(1rem, 1.6vw, 1.25rem);
  color: #5a5f72;
  max-width: 34em;
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: var(--base-padding);
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: #9aa0b5;
}

.hero-scroll .line {
  width: 48px; height: 1px;
  background: var(--c-blue);
  animation: scrollPulse 2s var(--ease-out) infinite;
}

@keyframes scrollPulse {
  0%, 100% { transform: scaleX(1); opacity: 1; }
  50% { transform: scaleX(0.4); opacity: 0.4; }
}

/* 3D 容器（P1 挂新疆 DEM 地形） */
.hero-3d {
  position: absolute;
  right: -5%; bottom: 0;
  width: 55vw; height: 75vh;
  pointer-events: none;
  z-index: -1;
}

/* ---------- 6. 业务板块大字导航 ---------- */
.biz-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--c-dark-white);
  border-top: 1px solid var(--c-dark-white);
  border-bottom: 1px solid var(--c-dark-white);
}

.biz-item {
  background: var(--c-white);
  padding: clamp(32px, 5vw, 72px) var(--base-padding);
  text-decoration: none;
  display: block;
  transition: background var(--dur) var(--ease-out);
  position: relative;
}

.biz-item:hover { background: var(--c-off-white); }

.biz-item .num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: #9aa0b5;
  letter-spacing: 0.15em;
}

.biz-item .name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.5vw, 3rem);
  color: var(--c-grey-blue);
  margin: 10px 0 6px;
  transition: color var(--dur) var(--ease-out);
}

.biz-item:hover .name { color: var(--c-blue); }

.biz-item .desc {
  font-size: 0.95rem;
  color: #5a5f72;
  max-width: 26em;
}

/* ---------- 7. Section 通用 ---------- */
.section {
  padding: clamp(60px, 10vw, 120px) var(--base-padding);
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 20px;
  margin-bottom: 40px;
}

.section-head h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 4vw, 3rem);
  color: var(--c-grey-blue);
}

.section-head .mono-tag { font-size: 0.65rem; }

/* 内容卡片（沿用现有内容，套新皮） */
.card {
  background: var(--c-white);
  border: 1px solid var(--c-dark-white);
  border-radius: var(--radius);
  padding: clamp(20px, 3vw, 36px);
  transition: border-color var(--dur) var(--ease-out), box-shadow var(--dur) var(--ease-out);
}

.card:hover {
  border-color: var(--c-blue);
  box-shadow: 0 8px 40px rgba(26,47,251,0.08);
}

.card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin-bottom: 10px;
  color: var(--c-grey-blue);
}

/* ---------- 8. CTA ---------- */
.cta-strip {
  background: var(--c-blue);
  color: #fff;
  border-radius: var(--radius);
  margin: 0 var(--base-padding) clamp(60px, 10vw, 120px);
  padding: clamp(36px, 6vw, 80px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.cta-strip .big {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.5vw, 2.8rem);
  line-height: 1.1;
}

.cta-strip .cta-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  color: #fff;
  text-decoration: none;
  border: 1px solid rgba(255,255,255,0.5);
  border-radius: var(--radius);
  padding: 14px 28px;
  transition: background var(--dur) var(--ease-out);
}

.cta-strip .cta-link:hover { background: rgba(255,255,255,0.15); }

/* ---------- 9. Footer ---------- */
.site-footer {
  border-top: 1px solid var(--c-dark-white);
  padding: clamp(40px, 6vw, 80px) var(--base-padding) 30px;
  background: var(--c-white);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 40px;
  margin-bottom: 48px;
}

.site-footer h4 {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--c-grey-blue);
  margin-bottom: 14px;
}

.site-footer p,
.site-footer a {
  font-size: 0.88rem;
  color: #5a5f72;
  text-decoration: none;
  line-height: 1.9;
}

.site-footer a:hover { color: var(--c-blue); }

.footer-bottom {
  border-top: 1px solid var(--c-dark-white);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: #9aa0b5;
}

/* ---------- 10. 工具类 ---------- */
.container-wide { max-width: 100%; }
.container { max-width: 1400px; margin: 0 auto; }

/* 等宽编号列表 */
.mono-list { list-style: none; }
.mono-list li {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 14px 0;
  border-bottom: 1px solid var(--c-dark-white);
  display: flex;
  gap: 16px;
  color: var(--c-grey-blue);
}
.mono-list li .idx { color: var(--c-blue); }

/* ---------- 11. 内页兼容（旧模板 class → lusion 风格） ---------- */
.page-hero {
  padding: 140px var(--base-padding) 60px;
  border-bottom: 1px solid var(--c-dark-white);
  background: var(--c-white);
}
.page-hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 4rem);
  color: var(--c-grey-blue);
  margin-bottom: 8px;
}
.page-hero p { color: #5a5f72; font-size: 1rem; }
.page-body {
  max-width: 900px;
  margin: 0 auto;
  padding: clamp(40px, 6vw, 80px) var(--base-padding);
}
.page-body h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--c-grey-blue);
  margin: 28px 0 12px;
}
.page-body h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--c-grey-blue);
  margin: 22px 0 10px;
}
.page-body p { margin-bottom: 12px; color: #5a5f72; }
.page-body ul { padding-left: 20px; margin-bottom: 12px; color: #5a5f72; }

/* 特性卡片（旧 class） */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--c-white);
  border: 1px solid var(--c-dark-white);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: border-color var(--dur) var(--ease-out);
}
.feature-card:hover { border-color: var(--c-blue); }
.feature-icon { font-size: 34px; margin-bottom: 14px; }
.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--c-grey-blue);
  margin-bottom: 8px;
}
.feature-card p { font-size: 0.9rem; color: #5a5f72; }

/* 数据条（旧 class） */
.stats-band {
  border-top: 1px solid var(--c-dark-white);
  border-bottom: 1px solid var(--c-dark-white);
  padding: clamp(36px, 6vw, 64px) var(--base-padding);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 20px;
}
.stat-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 3.2rem);
  color: var(--c-blue);
}
.stat-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: #9aa0b5;
  text-transform: uppercase;
}

/* 项目卡片（旧 class） */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.project-card {
  background: var(--c-white);
  border: 1px solid var(--c-dark-white);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: border-color var(--dur) var(--ease-out);
}
.project-card:hover { border-color: var(--c-blue); }
.project-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--c-blue);
  background: var(--c-off-white);
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 12px;
}
.project-card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--c-grey-blue);
  margin-bottom: 8px;
}
.project-card p { font-size: 0.9rem; color: #5a5f72; }

/* CTA（旧 class） */
.cta-band { padding: clamp(40px, 7vw, 80px) var(--base-padding); }
.cta-inner {
  background: var(--c-blue);
  border-radius: var(--radius);
  color: #fff;
  padding: clamp(30px, 5vw, 60px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.cta-inner h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 3vw, 2.2rem);
}
.cta-inner p { opacity: 0.85; margin-top: 6px; font-size: 0.95rem; }
.btn-light {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--c-blue);
  background: #fff;
  border-radius: var(--radius);
  padding: 14px 28px;
  text-decoration: none;
  transition: transform var(--dur) var(--ease-out);
}
.btn-light:hover { transform: translateY(-2px); }

/* 旧按钮兼容 */
.btn { display: inline-block; text-decoration: none; }
.btn-primary {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: #fff;
  background: var(--c-blue);
  border-radius: var(--radius);
  padding: 14px 28px;
  transition: background var(--dur) var(--ease-out);
}
.btn-primary:hover { background: var(--c-dark-blue); }
.btn-ghost {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--c-grey-blue);
  border: 1px solid var(--c-dark-white);
  border-radius: var(--radius);
  padding: 14px 28px;
  transition: border-color var(--dur) var(--ease-out);
}
.btn-ghost:hover { border-color: var(--c-blue); color: var(--c-blue); }

/* ---------- 12. 移动端 ---------- */
@media (max-width: 768px) {
  .main-nav { gap: 12px; }
  .main-nav a { font-size: 0.78rem; }
  .logo-text small { display: none; }
  .biz-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 140px; }
  .hero-3d { width: 90vw; height: 40vh; }
}