/* ============================================
   智启云创 - 企业官网样式
   Design: 「山间数据」Mountain Data
   Palette: Deep charcoal + Emerald + Sand gold
   ============================================ */

@import "https://fonts.googleapis.cn/css2?family=Noto+Serif+SC:wght@400;600;700;900&display=swap";

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

:root {
  --bg-primary: #0B0F14;
  --bg-secondary: #111920;
  --bg-tertiary: #161E28;
  --bg-card: #1A2332;
  --bg-card-hover: #1F2B3D;
  --accent-emerald: #00C9A7;
  --accent-emerald-dim: rgba(0, 201, 167, 0.15);
  --accent-gold: #C9A96E;
  --accent-gold-dim: rgba(201, 169, 110, 0.12);
  --text-primary: #E8ECF1;
  --text-secondary: #9BAAB8;
  --text-muted: #5A6B7A;
  --border-color: rgba(255, 255, 255, 0.06);
  --border-accent: rgba(0, 201, 167, 0.2);
  --font-serif: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --max-width: 1200px;
  --nav-height: 72px;
  --transition-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  transition: background 0.4s var(--transition-smooth), box-shadow 0.4s var(--transition-smooth);
}

.nav.scrolled {
  background: rgba(11, 15, 20, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--border-color);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.nav-logo-icon {
  width: 32px;
  height: 32px;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color 0.3s;
  position: relative;
  letter-spacing: 0.02em;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--accent-emerald);
  transition: width 0.3s var(--transition-smooth);
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-mobile-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-mobile-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  margin: 5px 0;
  transition: all 0.3s;
  border-radius: 2px;
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 0 2rem;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(0, 201, 167, 0.08) 0%, transparent 70%),
    radial-gradient(ellipse 60% 50% at 30% 60%, rgba(201, 169, 110, 0.05) 0%, transparent 60%),
    linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero-mountain-svg {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: auto;
  opacity: 0.12;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 201, 167, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 201, 167, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 50% at 50% 50%, black 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 70% 50% at 50% 50%, black 20%, transparent 70%);
}

.hero-particles {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.particle {
  position: absolute;
  width: 3px;
  height: 3px;
  background: var(--accent-emerald);
  border-radius: 50%;
  opacity: 0;
  animation: particleFloat 8s infinite;
}

@keyframes particleFloat {
  0% { opacity: 0; transform: translateY(0) scale(0.5); }
  20% { opacity: 0.6; }
  80% { opacity: 0.3; }
  100% { opacity: 0; transform: translateY(-200px) scale(1.2); }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 860px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.2rem;
  border: 1px solid var(--border-accent);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--accent-emerald);
  margin-bottom: 2rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--accent-emerald-dim);
  animation: fadeInDown 0.8s var(--transition-smooth) both;
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  background: var(--accent-emerald);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: 0.02em;
  text-align: center;
  margin-bottom: 1.5rem;
  animation: fadeInUp 0.8s var(--transition-smooth) 0.15s both;
}

.hero-title-accent {
  color: var(--accent-emerald);
  position: relative;
}

.hero-title-accent::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-emerald), transparent);
  border-radius: 2px;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 2.5rem;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  animation: fadeInUp 0.8s var(--transition-smooth) 0.3s both;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s var(--transition-smooth) 0.45s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: all 0.3s var(--transition-smooth);
  cursor: pointer;
  border: none;
  font-family: var(--font-sans);
}

.btn-primary {
  background: var(--accent-emerald);
  color: var(--bg-primary);
}

.btn-primary:hover {
  background: #00E0BA;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 201, 167, 0.25);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-outline:hover {
  border-color: var(--accent-emerald);
  color: var(--accent-emerald);
  background: var(--accent-emerald-dim);
  transform: translateY(-2px);
}

.hero-scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  animation: fadeInUp 1s var(--transition-smooth) 1s both;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent-emerald), transparent);
  margin: 0 auto;
  animation: scrollPulse 2s infinite;
}

@keyframes scrollPulse {
  0% { opacity: 1; transform: scaleY(1); }
  50% { opacity: 0.4; transform: scaleY(0.6); }
  100% { opacity: 1; transform: scaleY(1); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- Section Shared --- */
.section {
  padding: 7rem 2rem;
  position: relative;
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-header {
  margin-bottom: 4rem;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-emerald);
  margin-bottom: 1rem;
  font-weight: 600;
}

.section-label-line {
  width: 24px;
  height: 1px;
  background: var(--accent-emerald);
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 580px;
  line-height: 1.8;
}

/* --- About Section --- */
.about {
  background: var(--bg-secondary);
}

.about-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-text p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 2;
  margin-bottom: 1.5rem;
}

.about-text p:first-child::first-letter {
  font-family: var(--font-serif);
  font-size: 3.2rem;
  float: left;
  color: var(--accent-emerald);
  line-height: 1;
  margin-right: 0.5rem;
  margin-top: 0.15rem;
  font-weight: 700;
}

.about-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-visual-inner {
  position: relative;
  width: 100%;
  aspect-ratio: 4/3;
}

.about-illustration {
  width: 100%;
  height: 100%;
}

/* --- Values Section --- */
.values-layout {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.value-card {
  position: relative;
  padding: 2.2rem 1.8rem;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  background: var(--bg-secondary);
  overflow: hidden;
  transition: all 0.4s var(--transition-smooth);
}

.value-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-emerald);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--transition-smooth);
}

.value-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-6px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.value-card:hover::after {
  transform: scaleX(1);
}

.value-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--accent-emerald-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.2rem;
  transition: background 0.3s;
}

.value-card:hover .value-icon {
  background: rgba(0, 201, 167, 0.25);
}

.value-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--accent-emerald);
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.value-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  color: var(--text-primary);
}

.value-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* --- Business Section --- */
.business {
  background: var(--bg-secondary);
}

.business-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.business-card {
  position: relative;
  padding: 2.2rem;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  background: var(--bg-tertiary);
  transition: all 0.4s var(--transition-smooth);
  overflow: hidden;
}

.business-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 0;
  background: var(--accent-emerald);
  transition: height 0.4s var(--transition-smooth);
  border-radius: 0 2px 2px 0;
}

.business-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.25);
}

.business-card:hover::before {
  height: 100%;
}

.business-card-icon {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: var(--accent-emerald-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.4rem;
}

.business-card-icon svg {
  width: 22px;
  height: 22px;
  stroke: var(--accent-emerald);
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.business-card-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  color: var(--text-primary);
}

.business-card-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* --- Projects Section --- */
.projects-layout {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

/* --- Innovation Section --- */
.innovation {
  background: var(--bg-secondary);
}

.innovation-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.innovation-card {
  padding: 2rem;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  background: var(--bg-tertiary);
  transition: all 0.3s var(--transition-smooth);
}

.innovation-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-3px);
}

.innovation-card-num {
  font-family: var(--font-serif);
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--accent-gold);
  opacity: 0.2;
  line-height: 1;
  margin-bottom: 0.6rem;
}

.innovation-card-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.innovation-card-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.7;
}


/* --- Contact Section --- */
.contact-layout {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

.contact-card {
  background: var(--bg-elevated);
  border: 1px solid rgba(0, 201, 167, 0.1);
  border-radius: 12px;
  padding: 2rem 1.5rem;
  text-align: center;
  transition: all 0.4s ease;
}

.contact-card:hover {
  border-color: rgba(0, 201, 167, 0.3);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 201, 167, 0.08);
}

.contact-card-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 201, 167, 0.08);
  border-radius: 14px;
}

.contact-card-icon svg {
  width: 28px;
  height: 28px;
}

.contact-card-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.contact-card-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- Vision Section --- */
.vision-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.vision-card {
  padding: 2.5rem;
  border: 1px solid var(--border-color);
  border-radius: 16px;
  background: var(--bg-secondary);
  position: relative;
  overflow: hidden;
}

.vision-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-emerald), var(--accent-gold));
}

.vision-card-title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 1.2rem;
}

.vision-list {
  list-style: none;
}

.vision-list li {
  display: flex;
  gap: 0.8rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.vision-list li:last-child {
  border-bottom: none;
}

.vision-list-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: var(--accent-emerald-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.vision-list-icon svg {
  width: 14px;
  height: 14px;
  stroke: var(--accent-emerald);
  fill: none;
  stroke-width: 2;
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 4rem 2rem 2rem;
  background: var(--bg-primary);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand {
  max-width: 300px;
}

.footer-brand-name {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-brand-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.footer-col-title {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.footer-col-links {
  list-style: none;
}

.footer-col-links li {
  margin-bottom: 0.5rem;
}

.footer-col-links a {
  font-size: 0.88rem;
  color: var(--text-muted);
  transition: color 0.3s;
}

.footer-col-links a:hover {
  color: var(--accent-emerald);
}

.footer-bottom {
  display: flex;
  justify-content: center;
  align-items: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.footer-copyright {
  font-size: 0.82rem;
  color: var(--text-muted);
  text-align: center;
}

.footer-legal {
  display: flex;
  gap: 1.5rem;
}

.footer-legal a {
  font-size: 0.82rem;
  color: var(--text-muted);
  transition: color 0.3s;
}

.footer-legal a:hover {
  color: var(--text-primary);
}

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s var(--transition-smooth), transform 0.7s var(--transition-smooth);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* --- Topographic Background Pattern --- */
.topo-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.topo-bg svg {
  position: absolute;
  width: 100%;
  height: 100%;
  opacity: 0.03;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .about-layout {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .values-layout {
    grid-template-columns: repeat(2, 1fr);
  }

  .business-grid {
    grid-template-columns: repeat(2, 1fr);
  }


  .innovation-grid {
    grid-template-columns: repeat(2, 1fr);
  }


  .vision-layout {
    grid-template-columns: 1fr;
  }

  .contact-layout {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .nav-mobile-btn {
    display: block;
  }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(11, 15, 20, 0.96);
    backdrop-filter: blur(20px);
    padding: 1.5rem 2rem;
    gap: 1rem;
    border-bottom: 1px solid var(--border-color);
  }

  .hero-title {
    font-size: clamp(2rem, 8vw, 3rem);
  }

  .values-layout {
    grid-template-columns: 1fr;
  }

  .business-grid {
    grid-template-columns: 1fr;
  }


  .innovation-grid {
    grid-template-columns: 1fr;
  }


  .contact-layout {
    grid-template-columns: 1fr;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-bottom {
    flex-direction: column;
    justify-content: center;
    gap: 1rem;
    text-align: center;
  }

  .section {
    padding: 4rem 1.5rem;
  }
}

@media (max-width: 480px) {

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
}