:root {
  --primary: #4caf50;
  --primary-dark: #278c3b;
  --primary-soft: #e9f7eb;
  --ink: #15221a;
  --muted: #66736a;
  --line: #e3ebe5;
  --surface: #ffffff;
  --surface-2: #f6faf7;
  --accent: #ffb84d;
  --shadow: 0 24px 70px rgba(24, 44, 30, 0.12);
  --radius: 8px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: #fbfdfb;
  overflow-x: hidden;
}

body.nav-open {
  overflow: hidden;
}

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

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  padding: 0 clamp(20px, 5vw, 72px);
  color: #fff;
  transition: background 0.3s ease, color 0.3s ease, box-shadow 0.3s ease, height 0.3s ease;
}

.site-header.is-scrolled,
.site-header.is-open {
  height: 68px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 12px 32px rgba(19, 47, 26, 0.08);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  object-fit: cover;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
  font-size: 14px;
  font-weight: 600;
}

.header-download,
.mobile-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border: 0;
  border-radius: 8px;
  color: #fff;
  background: var(--primary);
  font: inherit;
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 14px 30px rgba(76, 175, 80, 0.24);
  transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.header-download {
  padding: 0 17px;
}

.mobile-download {
  width: 100%;
  margin-top: 8px;
}

.header-download:hover,
.mobile-download:hover {
  transform: translateY(-1px);
  background: var(--primary-dark);
}

.nav-links a {
  position: relative;
  opacity: 0.86;
  transition: opacity 0.2s ease;
}

.nav-links a::after {
  position: absolute;
  left: 0;
  bottom: -7px;
  width: 0;
  height: 2px;
  background: currentColor;
  content: "";
  transition: width 0.2s ease;
}

.nav-links a:hover {
  opacity: 1;
}

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

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 0;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.15);
  color: currentColor;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 5px auto;
  background: currentColor;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.site-header.is-open .menu-toggle span:first-child {
  transform: translateY(3.5px) rotate(45deg);
}

.site-header.is-open .menu-toggle span:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
}

.mobile-nav {
  position: fixed;
  top: 68px;
  left: 16px;
  right: 16px;
  z-index: 19;
  display: none;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.mobile-nav a {
  display: block;
  padding: 14px 12px;
  border-radius: 8px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 700;
}

.mobile-nav a:active {
  background: var(--primary-soft);
}

.mobile-nav.is-open {
  display: block;
}

.hero {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
  color: #fff;
  background: #102117;
}

.hero-media,
.hero-shade {
  position: absolute;
  inset: 0;
}

.hero-media {
  background:
    linear-gradient(90deg, rgba(8, 20, 13, 0.72), rgba(8, 20, 13, 0.38) 44%, rgba(8, 20, 13, 0.18)),
    url("https://images.unsplash.com/photo-1600607688969-a5bfcd646154?auto=format&fit=crop&w=2200&q=88") center / cover;
  transform: scale(1.04);
  animation: heroDrift 12s ease-out forwards;
}

.hero-shade {
  background:
    radial-gradient(circle at 18% 38%, rgba(76, 175, 80, 0.35), transparent 34%),
    linear-gradient(180deg, rgba(9, 20, 13, 0.12), rgba(9, 20, 13, 0.76));
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding-top: clamp(138px, 18vh, 210px);
}

.eyebrow,
.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 18px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow {
  color: #dff7e3;
}

.eyebrow::before,
.section-kicker::before {
  width: 28px;
  height: 2px;
  background: currentColor;
  content: "";
}

.hero h1 {
  margin: 0;
  font-size: clamp(56px, 10vw, 120px);
  line-height: 0.95;
  font-weight: 800;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 650px;
  margin: 28px 0 0;
  color: rgba(255, 255, 255, 0.88);
  font-size: clamp(20px, 3vw, 30px);
  line-height: 1.42;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 36px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border: 0;
  border-radius: 8px;
  font: inherit;
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

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

.btn-primary {
  color: #fff;
  background: var(--primary);
  box-shadow: 0 16px 36px rgba(76, 175, 80, 0.28);
}

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

.btn-glass {
  border: 1px solid rgba(255, 255, 255, 0.38);
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(12px);
}

.hero-panel {
  position: absolute;
  right: clamp(20px, 5vw, 72px);
  bottom: 34px;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, minmax(140px, 1fr));
  width: min(760px, calc(100% - 40px));
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: rgba(12, 25, 16, 0.58);
  box-shadow: 0 22px 60px rgba(0, 0, 0, 0.22);
  backdrop-filter: blur(18px);
}

.hero-panel div {
  padding: 22px;
}

.hero-panel div+div {
  border-left: 1px solid rgba(255, 255, 255, 0.16);
}

.hero-panel strong {
  display: block;
  margin-bottom: 8px;
  color: #fff;
  font-size: 20px;
}

.hero-panel span {
  color: rgba(255, 255, 255, 0.72);
  font-size: 13px;
  line-height: 1.55;
}

.section {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 106px 0;
}

.section-heading {
  max-width: 780px;
}

.section-heading.center {
  margin: 0 auto;
  text-align: center;
}

.section h2,
.split-content h2,
.app-copy h2,
.city-card h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(32px, 4vw, 52px);
  line-height: 1.12;
  letter-spacing: 0;
}

.section-heading p,
.split-content p,
.app-copy p,
.city-card p {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}

.intro-section {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 1fr);
  gap: 56px;
  align-items: end;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.metrics div {
  min-height: 136px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 18px 48px rgba(29, 55, 35, 0.06);
}

.metrics strong {
  display: block;
  color: var(--primary);
  font-size: 44px;
  line-height: 1;
}

.metrics span {
  display: block;
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
}

.platform-section {
  padding-top: 54px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 42px;
}

.feature-card {
  min-height: 250px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 20px 56px rgba(26, 51, 32, 0.06);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(76, 175, 80, 0.42);
  box-shadow: 0 24px 70px rgba(26, 51, 32, 0.12);
}

.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  margin-bottom: 28px;
  border-radius: 8px;
  color: #fff;
  background: var(--primary);
  font-size: 18px;
  font-weight: 800;
}

.feature-card h3,
.timeline-item h3,
.role-copy h3 {
  margin: 0 0 12px;
  color: var(--ink);
  font-size: 21px;
  line-height: 1.3;
}

.feature-card p,
.timeline-item p,
.role-copy p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.split-section {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(420px, 0.96fr);
  gap: clamp(32px, 6vw, 78px);
  align-items: center;
  width: min(1220px, calc(100% - 40px));
  margin: 0 auto;
  padding: 96px 0 108px;
}

.split-image {
  overflow: hidden;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.split-image img {
  width: 100%;
  aspect-ratio: 1.04 / 1;
  object-fit: cover;
  transition: transform 0.8s ease;
}

.split-image:hover img {
  transform: scale(1.04);
}

.role-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 30px 0 22px;
}

.role-tabs button {
  height: 42px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: #fff;
  font: inherit;
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.role-tabs button.active {
  border-color: var(--primary);
  color: #fff;
  background: var(--primary);
}

.role-copy {
  min-height: 178px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 18px 48px rgba(29, 55, 35, 0.06);
}

.workflow-section {
  width: 100%;
  max-width: none;
  padding-right: max(20px, calc((100vw - 1120px) / 2));
  padding-left: max(20px, calc((100vw - 1120px) / 2));
  background: var(--surface-2);
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  margin-top: 48px;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
}

.timeline-item {
  position: relative;
  min-height: 270px;
  padding: 34px 28px;
}

.timeline-item+.timeline-item {
  border-left: 1px solid var(--line);
}

.timeline-item span {
  display: block;
  margin-bottom: 54px;
  color: rgba(76, 175, 80, 0.22);
  font-size: 56px;
  line-height: 1;
  font-weight: 800;
}

.timeline-item::after {
  position: absolute;
  top: 74px;
  left: 28px;
  width: calc(100% - 56px);
  height: 2px;
  background: linear-gradient(90deg, var(--primary), rgba(76, 175, 80, 0.12));
  content: "";
}

.app-section {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1fr);
  gap: clamp(32px, 7vw, 96px);
  align-items: center;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 112px 0;
}

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.pill-list span {
  padding: 10px 14px;
  border: 1px solid rgba(76, 175, 80, 0.2);
  border-radius: 8px;
  color: var(--primary-dark);
  background: var(--primary-soft);
  font-size: 14px;
  font-weight: 800;
}

.phone-stack {
  position: relative;
  min-height: 610px;
}

.phone {
  position: absolute;
  right: 46px;
  top: 0;
  width: 300px;
  height: 610px;
  padding: 14px;
  border: 1px solid #d7e2da;
  border-radius: 44px;
  background: #111b15;
  box-shadow: 0 30px 80px rgba(21, 34, 26, 0.18);
}

.phone::before {
  position: absolute;
  top: 10px;
  left: 50%;
  width: 84px;
  height: 22px;
  border-radius: 0 0 16px 16px;
  background: #111b15;
  content: "";
  transform: translateX(-50%);
  z-index: 2;
}

.phone-screen {
  height: 100%;
  overflow: hidden;
  border-radius: 32px;
  background: #f7faf8;
}

.phone-shot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.phone-back {
  right: 250px;
  top: 86px;
  transform: rotate(-8deg) scale(0.9);
  opacity: 0.96;
}

.city-section {
  padding-top: 96px;
}

.city-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: clamp(30px, 5vw, 58px);
  border-radius: 8px;
  color: #fff;
  background:
    linear-gradient(90deg, rgba(16, 33, 23, 0.92), rgba(16, 33, 23, 0.72)),
    url("https://images.unsplash.com/photo-1518005020951-eccb494ad742?auto=format&fit=crop&w=1600&q=85") center / cover;
  box-shadow: var(--shadow);
}

.city-card h2,
.city-card p {
  color: #fff;
}

.city-card p {
  max-width: 720px;
  color: rgba(255, 255, 255, 0.76);
}

.site-footer {
  display: grid;
  grid-template-columns: auto minmax(240px, 1fr) auto;
  align-items: center;
  gap: 16px 32px;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 32px 0 48px;
  color: var(--muted);
  font-size: 14px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  white-space: nowrap;
}

.site-footer img {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  object-fit: cover;
}

.footer-copy {
  margin: 0;
  min-width: 0;
}

.footer-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 18px;
  font-weight: 700;
}

.footer-links a {
  color: var(--muted);
  transition: color 0.2s ease;
  white-space: nowrap;
}

.footer-links a:hover {
  color: var(--primary-dark);
}

.hidden {
  display: none !important;
}

.wechat-tip {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 34px 20px;
  background: rgba(10, 18, 13, 0.78);
  backdrop-filter: blur(8px);
}

.wechat-guide {
  position: relative;
  width: min(420px, 100%);
  padding: 34px 28px 28px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  color: #fff;
  background: rgba(18, 34, 23, 0.94);
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.28);
  text-align: center;
}

.wechat-guide h2 {
  margin: 8px 0 12px;
  font-size: 26px;
  line-height: 1.25;
}

.wechat-guide p {
  margin: 0 0 22px;
  color: rgba(255, 255, 255, 0.76);
  font-size: 16px;
  line-height: 1.7;
}

.wechat-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 34px;
  height: 34px;
  border: 0;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.1);
  cursor: pointer;
}

.wechat-close::before,
.wechat-close::after {
  position: absolute;
  top: 16px;
  left: 9px;
  width: 16px;
  height: 2px;
  background: #fff;
  content: "";
}

.wechat-close::before {
  transform: rotate(45deg);
}

.wechat-close::after {
  transform: rotate(-45deg);
}

.download-toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  z-index: 90;
  max-width: min(420px, calc(100% - 32px));
  padding: 13px 16px;
  border-radius: 8px;
  color: #fff;
  background: rgba(21, 34, 26, 0.94);
  box-shadow: 0 18px 42px rgba(21, 34, 26, 0.2);
  font-size: 14px;
  line-height: 1.5;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 10px);
  transition: opacity 0.22s ease, transform 0.22s ease;
}

.download-toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.legal-page {
  min-height: 100vh;
  background: var(--surface-2);
}

.legal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(980px, calc(100% - 40px));
  margin: 0 auto;
  padding: 24px 0;
}

.legal-brand {
  color: var(--ink);
}

.legal-back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--primary-dark);
  background: #fff;
  font-size: 14px;
  font-weight: 800;
}

.legal-main {
  width: min(980px, calc(100% - 40px));
  margin: 0 auto;
  padding: 22px 0 72px;
}

.legal-article {
  padding: clamp(28px, 5vw, 58px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 20px 56px rgba(26, 51, 32, 0.06);
}

.legal-article h1 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1.12;
  letter-spacing: 0;
}

.legal-date {
  margin: 16px 0 28px;
  color: var(--muted);
  font-size: 14px;
}

.legal-article h2 {
  margin: 34px 0 12px;
  color: var(--ink);
  font-size: 22px;
  line-height: 1.35;
}

.legal-article p,
.legal-article li {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.85;
}

.legal-article p {
  margin: 0 0 14px;
}

.legal-article ul {
  margin: 0 0 18px;
  padding-left: 22px;
}

.legal-article li+li {
  margin-top: 8px;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

@keyframes heroDrift {
  from {
    transform: scale(1.08);
  }

  to {
    transform: scale(1.02);
  }
}

@media (max-width: 980px) {
  .nav-links,
  .header-download {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .hero {
    min-height: 0;
    padding-bottom: 26px;
    overflow: hidden;
  }

  .hero-inner {
    width: calc(100% - 40px);
    padding-bottom: 28px;
  }

  .hero-panel {
    position: relative;
    left: auto;
    right: auto;
    bottom: auto;
    grid-template-columns: 1fr;
    width: calc(100% - 40px);
    max-width: none;
    margin: 0 auto;
  }

  .hero-panel div+div {
    border-top: 1px solid rgba(255, 255, 255, 0.16);
    border-left: 0;
  }

  .intro-section,
  .split-section,
  .app-section {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .timeline-item:nth-child(3) {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .timeline-item:nth-child(4) {
    border-top: 1px solid var(--line);
  }

  .phone-stack {
    min-height: 640px;
  }

  .phone {
    right: 8%;
  }

  .phone-back {
    right: auto;
    left: 4%;
  }

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

  .footer-links {
    justify-content: flex-start;
  }
}

@media (max-width: 680px) {
  .site-header {
    height: 66px;
    padding: 0 16px;
  }

  .site-header.is-scrolled,
  .site-header.is-open {
    height: 62px;
  }

  .brand img {
    width: 38px;
    height: 38px;
  }

  .mobile-nav {
    top: 62px;
  }


  .hero-inner {
    width: calc(100% - 32px);
    padding-top: 116px;
  }

  .hero-copy {
    font-size: 19px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .hero-panel {
    width: calc(100% - 32px);
  }

  .hero-panel div {
    padding: 18px;
  }

  .section,
  .split-section,
  .app-section {
    width: calc(100% - 32px);
    padding: 72px 0;
  }

  .platform-section {
    padding-top: 20px;
  }

  .feature-grid,
  .metrics,
  .timeline {
    grid-template-columns: 1fr;
  }

  .feature-card {
    min-height: auto;
    padding: 24px;
  }

  .split-section {
    gap: 28px;
  }

  .split-image img {
    aspect-ratio: 1 / 0.82;
  }

  .role-copy {
    min-height: 214px;
    padding: 22px;
  }

  .timeline-item,
  .timeline-item:nth-child(3),
  .timeline-item:nth-child(4) {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .timeline-item:first-child {
    border-top: 0;
  }

  .phone-stack {
    min-height: 585px;
  }

  .phone {
    right: auto;
    left: 50%;
    width: 270px;
    height: 550px;
    transform: translateX(-50%);
  }

  .phone-back {
    display: none;
  }

  .city-card {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

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