/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #f8f7f4;
  --surface:   #ffffff;
  --text:      #1a1a1a;
  --text-dim:  #6b6b6b;
  --text-faint:#9e9e9e;
  --line:      #e2e0da;
  --accent:    #b8974e;
  --radius:    4px;
  --nav-h:     52px;
  --banner-h:  68px;
  --footer-h:  34px;
  --top-offset: calc(var(--nav-h) + var(--banner-h));
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
  height: 100%;
}

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  letter-spacing: 0.01em;
  overflow: hidden;
  height: 100vh;
}

::selection { background: var(--text); color: var(--bg); }
a { color: inherit; text-decoration: none; }

/* === Navigation (Fixed) === */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  background: rgba(248,247,244,0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav-logo {
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  flex-shrink: 0;
}

.nav-brand {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.nav-company {
  font-size: 0.78rem;
  color: var(--text-faint);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 32px;
}
.nav-links a {
  font-size: 0.84rem;
  color: var(--text-dim);
  letter-spacing: 0.04em;
  transition: color 0.2s ease;
  cursor: pointer;
}
.nav-links a:hover,
.nav-links a.active { color: var(--text); font-weight: 500; }

/* === Banner (Fixed, below nav) === */
.banner {
  position: fixed;
  top: var(--nav-h);
  left: 0; right: 0;
  z-index: 199;
  height: var(--banner-h);
  background: var(--text);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.14em;
}
.banner-sep {
  width: 1px;
  height: 16px;
  background: rgba(184,151,78,0.4);
}

/* === Page System === */
.page {
  position: fixed;
  inset: 0;
  height: 100vh;
  display: none;
  align-items: center;
  justify-content: center;
  padding-top: var(--top-offset);
  padding-bottom: var(--footer-h);
  overflow: hidden;
}
.page.active { display: flex; }

.page-dark { background: var(--text); color: #c4c2bc; }

.page-inner {
  max-width: 980px;
  width: 100%;
  padding: 0 40px;
}

/* === Typography === */
.section-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--text-faint);
  margin-bottom: 12px;
}
.label-dark { color: #7a7872; }

.section-title {
  font-size: 2.25rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-intro {
  font-size: 0.88rem;
  color: var(--text-dim);
  max-width: 660px;
  line-height: 1.6;
  margin-bottom: 28px;
}

.module-intro {
  font-size: 0.95rem;
  color: var(--text-dim);
  max-width: 700px;
  line-height: 1.65;
  margin-bottom: 36px;
}

/* === Hero === */
#hero {
  text-align: center;
}

.hero-top {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 28px;
  margin-bottom: 28px;
}

.hero-title {
  font-size: clamp(3.5rem, 7vw, 6rem);
  font-weight: 500;
  letter-spacing: 0.05em;
  line-height: 0.9;
  flex-shrink: 0;
}

.hero-sub {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding-bottom: 0.15em;
}

.hero-subtitle {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.06em;
  line-height: 1.3;
}

.hero-note {
  font-size: 0.72rem;
  color: var(--text-faint);
  letter-spacing: 0.05em;
  line-height: 1.3;
}

.hero-tagline {
  font-size: 1.35rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  margin-bottom: 40px;
}

/* === 价值创造 — 对比表 === */
.table-wrap { margin: 0 auto; }

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
.compare-table th {
  text-align: left;
  font-weight: 600;
  padding: 14px 24px;
  border-bottom: 2px solid var(--text);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}
.compare-table td {
  padding: 16px 24px;
  border-bottom: 1px solid var(--line);
  color: var(--text-dim);
}
.compare-table td:first-child { color: var(--text); font-weight: 600; }
.compare-table td:last-child  { color: var(--text); }

/* === 价值实现 — 思维导图 === */
.mindmap {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 8px;
}

/* Root node */
.mm-root {
  position: relative;
  margin-bottom: 14px;
}
.mm-root span {
  display: inline-block;
  padding: 10px 28px;
  border: 1px solid var(--text);
  border-radius: 24px;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  background: var(--surface);
}
/* Trunk line from root down */
.mm-root::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  width: 1px;
  height: 14px;
  background: var(--line);
}

/* Branches container */
.mm-branches {
  position: relative;
  display: flex;
  gap: 48px;
  padding-top: 14px;
}
/* Horizontal connecting bar */
.mm-branches::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 64px);
  height: 1px;
  background: var(--line);
}
/* Trunk line entering horizontal bar */
.mm-branches::after {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  width: 1px;
  height: 14px;
  background: var(--line);
  transform: translateX(-0.5px);
}

/* Each branch column */
.mm-branch {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 220px;
}
/* Vertical line above node */
.mm-branch::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  width: 1px;
  height: 14px;
  background: var(--line);
}

/* Branch node */
.mm-icon {
  font-style: normal;
  color: var(--accent);
  margin-right: 6px;
  font-size: 0.8rem;
}

.mm-node {
  position: relative;
  z-index: 1;
  padding: 8px 22px;
  border: 1px solid var(--text);
  border-radius: 18px;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  background: var(--surface);
  margin-bottom: 16px;
}
/* Vertical line below node */
.mm-node::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  width: 1px;
  height: 16px;
  background: var(--line);
}

/* Leaves */
.mm-leaves {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
}

.mm-leaf {
  position: relative;
  padding: 10px 14px 10px 16px;
  font-size: 0.78rem;
  color: var(--text-dim);
  line-height: 1.5;
  border-left: 1px solid var(--line);
}
.mm-leaf strong {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}

/* === 系统总览 === */
.overview-trilogy {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.overview-card {
  padding: 44px 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  transition: border-color 0.3s ease;
}
.overview-card:hover { border-color: var(--accent); }

.overview-num {
  display: block;
  font-size: 0.7rem;
  color: var(--text-faint);
  letter-spacing: 0.08em;
  margin-bottom: 20px;
}

.overview-name {
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: 0.04em;
}

.overview-tag {
  font-size: 0.88rem;
  color: var(--accent);
  letter-spacing: 0.06em;
  margin-bottom: 18px;
}

.overview-desc {
  font-size: 0.86rem;
  color: var(--text-dim);
  line-height: 1.65;
}

.hero-trilogy .overview-card {
  padding: 34px 28px;
}
.hero-trilogy .overview-tag {
  font-size: 1rem;
  font-weight: 500;
}

/* === 9大能力列表 === */
.cap-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px 28px;
}
.cap-list li {
  font-size: 0.83rem;
  color: var(--text-dim);
  line-height: 1.55;
  padding-left: 18px;
  border-left: 1px solid var(--line);
}
.cap-list li strong {
  display: block;
  color: var(--text);
  font-weight: 600;
  margin-bottom: 2px;
}

/* === 模块二特征 === */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-bottom: 28px;
}
.feature {
  padding: 26px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.feature h4 {
  font-size: 0.86rem;
  font-weight: 600;
  margin-bottom: 7px;
}
.feature p {
  font-size: 0.8rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.monitor-scope {
  padding: 28px 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.monitor-scope h4 {
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 14px;
  color: var(--text-dim);
}
.monitor-scope ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
.monitor-scope li {
  font-size: 0.83rem;
  color: var(--text-dim);
}

/* === 模块三执行卡片 === */
.exec-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.exec-card {
  padding: 36px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.exec-card h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 10px;
}
.exec-card p {
  font-size: 0.84rem;
  color: var(--text-dim);
  line-height: 1.55;
}

/* === 技术引擎 · 左右布局 === */
.engine-layout {
  display: flex;
  gap: 48px;
  align-items: stretch;
}

.engine-left {
  flex: 0 0 46%;
}

.engine-right {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* --- 左栏：技术列表 --- */
.tech-list {
  list-style: none;
  margin-bottom: 32px;
}

.tech-list li {
  display: flex;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}
.tech-list li:last-child { border-bottom: none; }

.tech-icon {
  flex-shrink: 0;
  font-size: 0.58rem;
  color: var(--accent);
  padding-top: 3px;
  width: 18px;
  font-style: normal;
  line-height: 1;
}

.tech-list h4 {
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.tech-list p {
  font-size: 0.78rem;
  color: var(--text-dim);
  line-height: 1.5;
  margin: 0;
}

.tech-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
}

/* Stats row in right column (below mindmap) */
.engine-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  margin-top: 20px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.engine-stats .stat-num {
  font-size: 1.8rem;
}

.engine-stats .stat-unit {
  font-size: 0.85rem;
}

.engine-stats .stat-label {
  font-size: 0.64rem;
}

.engine-stats .stat-sep {
  height: 28px;
}

.stat { text-align: center; }
.stat-num {
  display: block;
  font-size: 3.25rem;
  font-weight: 300;
  letter-spacing: 0.02em;
  line-height: 1.1;
}
.stat-unit {
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--text-dim);
}
.stat-label {
  display: block;
  font-size: 0.76rem;
  color: var(--text-faint);
  letter-spacing: 0.06em;
  margin-top: 6px;
}
.stat-sep {
  width: 1px;
  height: 44px;
  background: var(--line);
}

/* === 右栏：适配场景 · 树状三分支 === */
.scene-map {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin-top: 10px;
}

/* -- Root node -- */
.sm-root {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 80px;
  padding: 14px 10px;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  background: var(--surface);
  text-align: center;
  position: relative;
}
/* line from root to branches */
.sm-root::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 100%;
  width: 14px;
  height: 1px;
  background: var(--line);
}

/* Globe icon — simple CSS sphere */
.sm-globe {
  display: block;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1.5px solid var(--accent);
  position: relative;
  font-style: normal;
}
.sm-globe::before {
  content: '';
  position: absolute;
  top: 2px; left: 2px; right: 2px; bottom: 2px;
  border-radius: 50%;
  border: 1px solid var(--accent);
  opacity: 0.5;
}
.sm-globe::after {
  content: '';
  position: absolute;
  top: 50%;
  left: -3px;
  right: -3px;
  height: 1px;
  background: var(--accent);
  opacity: 0.5;
}
.sm-root > span {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text);
  line-height: 1.3;
}

/* -- Branches container -- */
.sm-branches {
  flex: 1;
  display: flex;
  gap: 0;
  position: relative;
  padding-left: 14px;
}
/* horizontal connector from root */
.sm-branches::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--line);
}

/* -- Each branch column -- */
.sm-branch {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  padding: 0 6px;
}
/* vertical line down from horizontal bar */
.sm-branch::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 1px;
  height: 12px;
  background: var(--line);
}

/* -- Category node -- */
.sm-cat {
  position: relative;
  z-index: 1;
  margin-top: 12px;
  margin-bottom: 10px;
}
.sm-cat span {
  display: inline-block;
  padding: 5px 14px;
  border: 1px solid var(--text);
  border-radius: 14px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  background: var(--surface);
}
/* vertical line below cat */
.sm-cat::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  width: 1px;
  height: 10px;
  background: var(--line);
}

/* -- Leaves -- */
.sm-leaves {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 100%;
}
.sm-leaves span {
  display: block;
  padding: 3px 8px 3px 12px;
  font-size: 0.65rem;
  color: var(--text-dim);
  line-height: 1.4;
  border-left: 1px solid var(--line);
}

/* === 关于我们 === */
#about .page-inner { padding-top: 72px; }

#about .section-title {
  font-size: 2.8rem;
  margin-bottom: 24px;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
}
.about-text p {
  font-size: 0.92rem;
  color: var(--text-dim);
  line-height: 1.75;
  margin-bottom: 18px;
}
.about-text p:last-child { margin-bottom: 0; }

.principle {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.principle:last-child { border-bottom: none; }
.principle h4 {
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 5px;
}
.principle p {
  font-size: 0.86rem;
  color: var(--text-dim);
  line-height: 1.55;
}

/* === 联系我们 === */
.footer-cta {
  font-size: 1.9rem;
  font-weight: 500;
  color: #e8e6e0;
  letter-spacing: 0.04em;
  margin-bottom: 44px;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px 44px;
  margin-bottom: 40px;
}
.contact-item {
  display: flex;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255,255,255,0.07);
  font-size: 0.88rem;
}
.contact-key {
  color: #7a7872;
  min-width: 44px;
  letter-spacing: 0.06em;
  font-size: 0.76rem;
}


/* === About Contact (compact, inside about page) === */
.about-contact {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0 20px;
  margin-top: 24px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.about-contact .contact-item {
  display: flex;
  gap: 8px;
  padding: 6px 0;
  border-bottom: none;
  font-size: 0.82rem;
  color: var(--text-dim);
}

.about-contact .contact-key {
  color: var(--text-faint);
  min-width: auto;
  letter-spacing: 0.06em;
  font-size: 0.72rem;
}

/* Service row (light bg) */
.service-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  font-size: 0.78rem;
  color: var(--text-faint);
  letter-spacing: 0.03em;
  margin-top: 32px;
}

.service-divider {
  width: 1px;
  height: 14px;
  background: var(--line);
}

/* Footer bottom (light bg) */
.footer-bottom {
  text-align: center;
  font-size: 0.74rem;
  color: var(--text-faint);
  letter-spacing: 0.05em;
  margin-top: 28px;
  padding-top: 24px;
}

/* === Footer (Fixed, bottom) === */
.footer {
  position: fixed;
  bottom: 0;
  left: 0; right: 0;
  z-index: 200;
  height: var(--footer-h);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: rgba(248,247,244,0.94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-top: 1px solid var(--line);
  font-size: 0.68rem;
  color: var(--text-faint);
  letter-spacing: 0.03em;
  padding: 0 20px;
}

.footer a {
  color: var(--text-faint);
  text-decoration: none;
  transition: color 0.2s;
}
.footer a:hover { color: var(--text-dim); }

.footer .footer-sep {
  width: 1px;
  height: 14px;
  background: var(--line);
}

.footer .beian-icon {
  height: 14px;
  vertical-align: middle;
  margin-right: 4px;
}

/* === Page Arrows === */
.page-arrow {
  position: fixed;
  top: 50%;
  z-index: 150;
  background: rgba(255,255,255,0.85);
  border: 1px solid var(--line);
  border-radius: 50%;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.2rem;
  color: var(--text-dim);
  transition: all 0.2s ease;
  user-select: none;
}
.page-arrow:hover {
  background: var(--surface);
  color: var(--text);
  border-color: var(--text-dim);
}
.page-arrow-left  { left: 20px; }
.page-arrow-right { right: 20px; }

/* === Responsive (hidden arrows + reduce text on narrow) === */
@media (max-width: 900px) {
  .page-arrow { display: none; }
  .nav-links { gap: 18px; }
  .nav-links a { font-size: 0.76rem; }
  .page-inner { padding: 0 24px; }
  .mm-branches { gap: 24px; }
  .mm-branch { width: 180px; }
  .mm-leaf { font-size: 0.72rem; }
  .mm-leaf strong { font-size: 0.76rem; }

  .engine-layout {
    flex-direction: column;
    gap: 28px;
  }
  .engine-left,
  .engine-right {
    flex: none;
    width: 100%;
  }
  .scene-map {
    height: 300px;
  }
}