:root {
  --bg: #eef2f5;
  --bg-deep: #e2e9ef;
  --ink: #0c1b2a;
  --ink-soft: #3d5163;
  --line: rgba(12, 27, 42, 0.12);
  --accent: #0f8f7b;
  --accent-deep: #0a6b5c;
  --surface: rgba(255, 255, 255, 0.72);
  --header-h: 4.25rem;
  --radius: 1.25rem;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-display: "Songti SC", "STSong", "SimSun", "Noto Serif SC", serif;
  --font-brand: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --shadow-soft: 0 18px 50px rgba(12, 27, 42, 0.08);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(15, 143, 123, 0.14), transparent 55%),
    radial-gradient(900px 500px at -10% 20%, rgba(12, 27, 42, 0.06), transparent 50%),
    linear-gradient(180deg, #f5f7f9 0%, var(--bg) 40%, #f7f9fb 100%);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

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

button,
input,
textarea {
  font: inherit;
}

.container {
  width: min(1120px, calc(100% - 2.5rem));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  backdrop-filter: blur(14px);
  background: rgba(245, 247, 249, 0.78);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(245, 247, 249, 0.92);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
}

.logo-img {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  flex-shrink: 0;
}

.logo-text {
  font-family: var(--font-brand);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
}

.site-footer .logo-img {
  width: 2.25rem;
  height: 2.25rem;
}

.site-footer .logo-text {
  font-size: 0.98rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.site-nav a {
  font-size: 0.95rem;
  color: var(--ink-soft);
  transition: color 0.2s ease;
}

.site-nav a:hover {
  color: var(--ink);
}

.nav-cta {
  padding: 0.55rem 1rem;
  border: 1px solid var(--ink);
  border-radius: 999px;
  color: var(--ink) !important;
  transition: background 0.25s var(--ease), color 0.25s var(--ease);
}

.nav-cta:hover {
  background: var(--ink);
  color: #fff !important;
}

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border: 0;
  background: transparent;
  padding: 0;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 1.35rem;
  height: 2px;
  margin: 0.35rem auto;
  background: var(--ink);
  transition: transform 0.25s var(--ease), opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(4px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-4px) rotate(-45deg);
}

/* Hero — 左右半屏斜切，两侧边距对齐 */
.hero {
  position: relative;
  min-height: calc(100svh - var(--header-h));
  display: grid;
  align-items: center;
  overflow: hidden;
  isolation: isolate;
}

.hero-visual {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(115deg, rgba(238, 242, 245, 0.95) 0%, rgba(238, 242, 245, 0.72) 50%, rgba(12, 27, 42, 0.78) 50%, rgba(12, 27, 42, 0.94) 100%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.07) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: linear-gradient(90deg, transparent 46%, #000 54%);
  opacity: 0.7;
  animation: grid-drift 28s linear infinite;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(42px);
  opacity: 0.58;
  pointer-events: none;
}

.hero-orb-a {
  width: min(42vw, 420px);
  height: min(42vw, 420px);
  right: max(1.25rem, calc((100vw - min(1120px, calc(100vw - 2.5rem))) / 2));
  top: 8%;
  background: radial-gradient(circle, rgba(15, 143, 123, 0.75), transparent 70%);
  animation: float-a 9s ease-in-out infinite;
}

.hero-orb-b {
  width: min(28vw, 280px);
  height: min(28vw, 280px);
  right: max(8%, calc((100vw - min(1120px, calc(100vw - 2.5rem))) / 2 + 8%));
  bottom: 14%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.28), transparent 70%);
  animation: float-b 11s ease-in-out infinite;
}

.hero-orb-c {
  width: min(22vw, 200px);
  height: min(22vw, 200px);
  right: 28%;
  top: 44%;
  background: radial-gradient(circle, rgba(80, 170, 220, 0.28), transparent 70%);
  animation: float-a 12s ease-in-out infinite reverse;
}

.hero-mark {
  position: absolute;
  right: max(1.25rem, calc((100vw - min(1120px, calc(100vw - 2.5rem))) / 2));
  bottom: 8%;
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 800;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.06);
  user-select: none;
  pointer-events: none;
  line-height: 1;
  transform: rotate(-8deg);
}

.hero-layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  align-items: center;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding: clamp(3.5rem, 10vh, 7rem) 0;
}

.hero-content {
  width: 100%;
  max-width: 34rem;
  margin: 0;
  justify-self: start;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: rise-in 0.9s var(--ease) both;
}

.hero-graphic {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  animation: rise-in 1s var(--ease) 0.08s both;
}

.hero-circuit {
  position: relative;
  width: min(100%, 460px);
  height: auto;
  opacity: 0.78;
}

.circuit-path {
  stroke: rgba(255, 255, 255, 0.42);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-dasharray: 8 10;
  animation: dash-move 18s linear infinite;
}

.hero-circuit circle,
.hero-circuit rect {
  stroke: rgba(90, 210, 185, 0.95);
  stroke-width: 1.6;
  fill: rgba(12, 27, 42, 0.4);
}

.hero-brand {
  margin: 0 0 1rem;
  font-family: var(--font-brand);
  font-weight: 800;
  font-size: clamp(2.2rem, 6.5vw, 3.8rem);
  line-height: 1.1;
  letter-spacing: 0.04em;
  color: var(--ink);
  text-align: center;
  width: 100%;
}

.hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.55rem, 3.4vw, 2.15rem);
  line-height: 1.35;
  letter-spacing: 0.02em;
  color: var(--ink);
  text-align: center;
  width: 100%;
}

.hero-lead {
  margin: 1.1rem 0 0;
  max-width: 30rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
  text-align: center;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.85rem;
  margin-top: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.7rem 1.35rem;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s var(--ease), background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-deep);
}

.btn-ghost {
  border-color: rgba(12, 27, 42, 0.28);
  background: rgba(255, 255, 255, 0.45);
  color: var(--ink);
}

.btn-ghost:hover {
  border-color: var(--ink);
  background: #fff;
}

/* Sections */
.section {
  padding: clamp(4.5rem, 10vw, 7rem) 0;
}

.section-head {
  text-align: center;
  max-width: 36rem;
  margin: 0 auto 3rem;
}

.section-head.align-left {
  text-align: left;
  margin-left: 0;
}

.section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.2rem);
  line-height: 1.3;
}

.section-head p {
  margin: 0.85rem 0 0;
  color: var(--ink-soft);
}

/* Services */
.service-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.service-list li {
  background: rgba(255, 255, 255, 0.65);
  padding: clamp(1.5rem, 3vw, 2.25rem);
  transition: background 0.25s ease;
}

.service-list li:hover {
  background: #fff;
}

.service-index {
  display: block;
  font-family: var(--font-brand);
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
}

.service-list h3 {
  margin: 0 0 0.65rem;
  font-size: 1.2rem;
  font-weight: 700;
}

.service-list p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.98rem;
}

/* About */
.about {
  background:
    linear-gradient(180deg, transparent, rgba(12, 27, 42, 0.03) 20%, rgba(12, 27, 42, 0.03) 80%, transparent);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: end;
}

.about-text {
  margin: 0;
  color: var(--ink-soft);
  max-width: 36rem;
  font-size: 1.02rem;
}

.about-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.about-points li {
  padding-bottom: 1.1rem;
  border-bottom: 1px solid var(--line);
}

.about-points li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.about-points strong {
  display: block;
  font-size: 1.1rem;
  margin-bottom: 0.35rem;
}

.about-points span {
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* Process */
.process-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.25rem;
  counter-reset: step;
}

.process-list li {
  position: relative;
  padding-top: 2.75rem;
  counter-increment: step;
}

.process-list li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: 0;
  left: 0;
  font-family: var(--font-brand);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--accent);
}

.process-list li::after {
  content: "";
  position: absolute;
  top: 0.7rem;
  left: 2.6rem;
  right: -0.6rem;
  height: 1px;
  background: linear-gradient(90deg, var(--line), transparent);
}

.process-list li:last-child::after {
  display: none;
}

.process-list strong {
  display: block;
  font-size: 1.1rem;
  margin-bottom: 0.45rem;
}

.process-list span {
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* Contact */
.contact {
  padding-bottom: clamp(5rem, 12vw, 8rem);
}

.contact-panel {
  padding: clamp(2rem, 5vw, 3.25rem);
  border-radius: calc(var(--radius) + 0.35rem);
  background:
    linear-gradient(145deg, rgba(12, 27, 42, 0.96), rgba(15, 48, 58, 0.94));
  color: #e8eef2;
  box-shadow: var(--shadow-soft);
}

.contact-intro {
  max-width: 40rem;
}

.contact-intro h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3vw, 2rem);
  line-height: 1.35;
}

.contact-intro > p {
  margin: 0.85rem 0 0;
  color: rgba(232, 238, 242, 0.72);
}

.contact-meta {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.contact-meta li {
  display: grid;
  gap: 0.2rem;
}

.contact-meta span:first-child {
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(232, 238, 242, 0.5);
}

.contact-meta a,
.contact-meta .contact-value {
  color: #fff;
  border-bottom: 1px solid transparent;
  width: fit-content;
  transition: border-color 0.2s ease;
  font-size: 1.15rem;
  line-height: 1.55;
}

.contact-meta a:hover {
  border-bottom-color: rgba(255, 255, 255, 0.55);
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.contact .btn-ghost {
  border-color: rgba(255, 255, 255, 0.32);
  background: transparent;
  color: #fff;
}

.contact .btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.7);
  background: rgba(255, 255, 255, 0.1);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.75rem 0 2.25rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
}

.footer-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.35rem;
  text-align: right;
}

.site-footer p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.beian {
  color: var(--ink-soft);
  font-size: 0.88rem;
  transition: color 0.2s ease;
}

.beian:hover {
  color: var(--ink);
}

.beian-gongan {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.beian-icon {
  display: block;
  flex-shrink: 0;
}

@media (max-width: 720px) {
  .footer-meta {
    align-items: flex-start;
    text-align: left;
    width: 100%;
  }
}

/* Reveal */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* Animations */
@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes float-a {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-22px); }
}

@keyframes float-b {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-16px, 18px); }
}

@keyframes dash-move {
  to { stroke-dashoffset: -240; }
}

@keyframes grid-drift {
  from { background-position: 0 0; }
  to { background-position: 48px 48px; }
}

@keyframes ring-pulse {
  0%, 100% { transform: scale(1); opacity: 0.7; }
  50% { transform: scale(1.04); opacity: 1; }
}

@keyframes spin-slow {
  to { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 960px) {
  .about-grid,
  .process-list {
    grid-template-columns: 1fr;
  }

  .process-list li::after {
    display: none;
  }

  .process-list {
    gap: 1.75rem;
  }

  .hero-visual {
    background:
      linear-gradient(180deg, rgba(238, 242, 245, 0.94) 0%, rgba(238, 242, 245, 0.7) 46%, rgba(12, 27, 42, 0.86) 70%, rgba(12, 27, 42, 0.96) 100%);
  }

  .hero-grid {
    mask-image: linear-gradient(180deg, transparent 20%, #000 58%);
  }

  .hero-layout {
    grid-template-columns: 1fr;
    gap: 1.75rem;
    padding-top: clamp(2.5rem, 6vh, 3.5rem);
    padding-bottom: clamp(3rem, 10vw, 4.5rem);
  }

  /* 手机：文案在上（浅色区），图标在下（深色区） */
  .hero-content {
    order: 1;
    max-width: none;
    width: 100%;
  }

  .hero-graphic {
    order: 2;
    justify-content: center;
  }

  .hero-circuit {
    width: min(68vw, 280px);
    opacity: 0.6;
  }

  .hero-mark {
    right: 1.25rem;
    bottom: 8%;
    font-size: clamp(2.4rem, 12vw, 3.8rem);
  }

  .hero-orb-a,
  .hero-orb-b,
  .hero-orb-c {
    opacity: 0.4;
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: fixed;
    inset: var(--header-h) 1rem auto;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0.35rem;
    padding: 0.85rem;
    border: 1px solid var(--line);
    border-radius: 1rem;
    background: rgba(255, 255, 255, 0.96);
    box-shadow: var(--shadow-soft);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 0.85rem 0.9rem;
    border-radius: 0.75rem;
  }

  .site-nav a:hover {
    background: var(--bg-deep);
  }

  .nav-cta {
    text-align: center;
    border-radius: 0.75rem;
  }

  .service-list {
    grid-template-columns: 1fr;
  }

  .hero-brand {
    font-size: clamp(2.4rem, 14vw, 3.4rem);
  }

  .hero h1 {
    font-size: 1.45rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}