:root {
  --bg: #ffffff;
  --text: #111111;
  --muted: #666666;
  --line: #e7e7e7;
  --card: #f8f8f8;
  --dark: #111111;
  --radius-lg: 26px;
  --radius-md: 18px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

body {
  position: relative;
  min-height: 100vh;
  line-height: 1.6;
}

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

.page-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.35;
  background-image:
    radial-gradient(circle at 12% 15%, rgba(20, 20, 20, 0.08), transparent 28%),
    radial-gradient(circle at 86% 20%, rgba(20, 20, 20, 0.06), transparent 28%),
    radial-gradient(#ececec 1px, transparent 1px);
  background-size:
    auto,
    auto,
    34px 34px;
}

.container {
  width: min(1160px, calc(100% - 48px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 255, 255, 0.84);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  height: 64px;
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  width: 32px;
  height: 32px;
  display: inline-grid;
  place-items: center;
  border-radius: 10px;
  background: var(--dark);
  color: #fff;
  font-size: 12px;
  letter-spacing: 0.1em;
  font-weight: 700;
}

.brand-name {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.top-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 8px;
}

.top-nav .nav-item {
  display: inline-block;
  font-size: 14px;
  color: var(--muted);
  padding: 7px 13px;
  border-radius: 10px;
  cursor: default;
}

.hero {
  padding: 96px 0 68px;
  text-align: center;
}

.hero-logo {
  font-size: clamp(52px, 12vw, 132px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.04em;
}

.hero-subtitle {
  margin: 18px auto 12px;
  font-size: clamp(18px, 2.7vw, 30px);
  font-weight: 300;
  color: #4e4e4e;
}

.hero-tagline {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: #9c9c9c;
}

.mode-section {
  padding: 22px 0 92px;
}

.mode-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.mode-card {
  display: flex;
  flex-direction: column;
  min-height: 310px;
  background: linear-gradient(180deg, #fbfbfb, #f6f6f6);
  border: 1px solid #efefef;
  border-radius: var(--radius-lg);
  padding: 30px;
  transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease;
}

.mode-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 22px 42px -24px rgba(0, 0, 0, 0.28);
  border-color: #d8d8d8;
}

.mode-icon {
  margin: 0 0 18px;
  width: 52px;
  height: 52px;
  display: inline-grid;
  place-items: center;
  border-radius: 14px;
  font-size: 24px;
  background: #fff;
  border: 1px solid #ececec;
}

.mode-card h2 {
  margin: 0 0 10px;
  font-size: 30px;
  line-height: 1.2;
}

.mode-card p {
  margin: 0;
  color: var(--muted);
}

.btn-dark {
  margin-top: auto;
  align-self: flex-start;
  padding: 12px 20px;
  border-radius: 12px;
  background: var(--dark);
  color: #fff;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 700;
  transition: 0.2s ease;
}

.btn-dark:hover {
  background: #2a2a2a;
}

.features {
  padding: 0 0 92px;
}

.section-title {
  text-align: center;
  margin-bottom: 36px;
}

.section-title h2 {
  margin: 0;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.1;
}

.section-title p {
  margin: 12px 0 0;
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.feature-item {
  padding: 30px 24px;
  background: #fff;
  border-right: 1px solid var(--line);
}

.feature-item:last-child {
  border-right: 0;
}

.feature-item h3 {
  margin: 0 0 10px;
  font-size: 22px;
  line-height: 1.3;
}

.feature-item p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.process {
  padding: 22px 0 100px;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 26px;
}

.process-intro {
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
}

.process-intro h2 {
  margin: 0;
  font-size: clamp(38px, 5vw, 64px);
  line-height: 1.04;
  letter-spacing: -0.01em;
}

.process-intro h2 span {
  display: block;
  color: #8f8f8f;
  font-style: italic;
  font-weight: 500;
}

.process-intro p {
  margin: 22px 0 0;
  color: var(--muted);
}

.process-list {
  display: grid;
  gap: 14px;
}

.process-list article {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 24px;
  background: #fff;
}

.step-no {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 10px;
  border-radius: 999px;
  background: #f2f2f2;
  color: #888;
  font-size: 12px;
  letter-spacing: 0.08em;
  font-weight: 700;
}

.process-list h3 {
  margin: 0 0 6px;
}

.process-list p {
  margin: 0;
  color: var(--muted);
}

.cta {
  padding: 90px 0;
  background: var(--dark);
  color: #fff;
}

.cta-inner {
  text-align: center;
}

.cta h2 {
  margin: 0;
  font-size: clamp(34px, 8vw, 80px);
  line-height: 1.04;
}

.cta p {
  margin: 18px auto 0;
  max-width: 720px;
  color: #c5c5c5;
}

.cta-actions {
  margin-top: 32px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}

.btn-light,
.btn-outline {
  display: inline-block;
  padding: 14px 24px;
  border-radius: 999px;
  font-weight: 700;
  transition: 0.2s ease;
}

.btn-light {
  background: #fff;
  color: #101010;
}

.btn-light:hover {
  background: #e9e9e9;
}

.btn-outline {
  border: 1px solid #777;
  color: #f3f3f3;
}

.btn-outline:hover {
  border-color: #fff;
  background: #fff;
  color: #111;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #fafafa;
}

.footer-inner {
  min-height: 88px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.site-footer strong {
  font-size: 18px;
  letter-spacing: 0.06em;
}

.site-footer p {
  margin: 0;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: #9a9a9a;
}

.site-footer .icp-record {
  text-transform: none;
  letter-spacing: normal;
  font-size: 13px;
}

@media (max-width: 1040px) {
  .mode-grid {
    grid-template-columns: 1fr;
  }

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

  .feature-item {
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }

  .feature-item:nth-child(2n) {
    border-right: 0;
  }

  .feature-item:nth-last-child(-n + 2) {
    border-bottom: 0;
  }

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

@media (max-width: 680px) {
  .container {
    width: min(1160px, calc(100% - 32px));
  }

  .header-inner {
    height: auto;
    min-height: 64px;
    flex-wrap: wrap;
    padding: 10px 0;
  }

  .top-nav {
    margin-left: 0;
    width: 100%;
  }

  .top-nav .nav-item {
    padding-left: 0;
  }

  .hero {
    padding-top: 78px;
  }

  .hero-tagline {
    letter-spacing: 0.2em;
  }

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

  .feature-item {
    border-right: 0;
  }

  .feature-item:not(:last-child) {
    border-bottom: 1px solid var(--line);
  }

  .site-footer p {
    letter-spacing: 0.08em;
    line-height: 1.5;
  }
}