:root {
  --ink: #121212;
  --muted: #6e6e73;
  --line: #e5e5e7;
  --white: #ffffff;
  --soft: #f5f5f7;
  --blue: #0071e3;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-width: 320px;
  min-height: 100%;
}

body {
  margin: 0;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  background: var(--white);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Microsoft YaHei", sans-serif;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
}

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

.site-header {
  width: 100%;
  height: 64px;
  padding: 0 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: fixed;
  inset: 0 0 auto;
  z-index: 10;
  border-bottom: 1px solid rgba(18, 18, 18, 0.06);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(180%) blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 650;
}

.brand-mark {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 7px;
  background: var(--ink);
  color: var(--white);
  font-size: 13px;
  font-weight: 700;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 13px;
  font-weight: 550;
}

.nav-login {
  color: #3a3a3c;
}

.nav-register {
  padding: 8px 14px;
  border-radius: 7px;
  background: var(--ink);
  color: var(--white);
}

.nav-login:hover {
  color: var(--blue);
}

.nav-register:hover {
  background: #303030;
}

.hero {
  flex: 1;
  padding: 64px 24px 0;
  display: flex;
  flex-direction: column;
}

.hero-content {
  width: min(1320px, 100%);
  flex: 1;
  margin: 0 auto;
  padding: 74px 0 58px;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(340px, 0.75fr);
  align-items: center;
  gap: 96px;
}

.hero-heading,
.hero-detail {
  min-width: 0;
}

.eyebrow {
  margin: 0 0 22px;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 560;
}

.eyebrow span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--blue);
}

h1 {
  margin: 0;
  color: #050505;
  font-size: 104px;
  line-height: 0.98;
  font-weight: 720;
  letter-spacing: 0;
}

.hero-summary {
  margin: 0;
  color: var(--muted);
  font-size: 19px;
  line-height: 1.75;
}

.hero-actions {
  margin-top: 34px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.button {
  min-width: 118px;
  min-height: 44px;
  padding: 0 19px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease;
}

.button-primary {
  background: var(--ink);
  color: var(--white);
}

.button-primary:hover {
  background: #303030;
}

.button-secondary {
  border-color: #d2d2d7;
  background: var(--white);
}

.button-secondary:hover {
  border-color: #a1a1a6;
}

.capability-line {
  width: min(1320px, 100%);
  min-height: 62px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 30px;
  border-top: 1px solid var(--line);
  color: #707075;
  font-size: 12px;
  font-weight: 560;
}

.capability-line i {
  width: 2px;
  height: 2px;
  border-radius: 50%;
  background: #b6b6ba;
}

.site-footer {
  min-height: 56px;
  padding: 0 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-top: 1px solid var(--line);
  background: var(--soft);
  color: #77777c;
  font-size: 11px;
}

@media (min-width: 1500px) {
  .hero-content {
    padding-top: 96px;
    gap: 140px;
  }

  h1 {
    font-size: 118px;
  }
}

@media (max-width: 900px) {
  .hero-content {
    width: min(760px, 100%);
    padding: 76px 0 48px;
    display: flex;
    align-items: center;
    flex-direction: column;
    gap: 0;
    text-align: center;
  }

  h1 {
    font-size: 76px;
  }

  .hero-summary {
    margin-top: 28px;
    font-size: 18px;
  }

  .capability-line {
    width: min(680px, 100%);
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .site-header {
    height: 58px;
    padding: 0 18px;
  }

  .brand {
    font-size: 13px;
  }

  .brand-mark {
    width: 26px;
    height: 26px;
    font-size: 12px;
  }

  .nav-actions {
    gap: 13px;
    font-size: 12px;
  }

  .nav-register {
    padding: 8px 11px;
  }

  .hero {
    padding: 58px 18px 0;
  }

  .hero-content {
    padding: 64px 0 42px;
  }

  .eyebrow {
    margin-bottom: 20px;
    font-size: 12px;
  }

  h1 {
    font-size: 54px;
  }

  .hero-summary {
    margin-top: 25px;
    font-size: 16px;
    line-height: 1.7;
  }

  .hero-actions {
    margin-top: 29px;
    gap: 9px;
  }

  .button {
    min-width: 112px;
    min-height: 42px;
    padding: 0 15px;
    font-size: 13px;
  }

  .capability-line {
    min-height: 58px;
    gap: 13px;
    font-size: 11px;
  }

  .site-footer {
    min-height: 68px;
    padding: 0 18px;
  }
}

@media (max-width: 360px) {
  .brand span:last-child {
    display: none;
  }

  .capability-line {
    gap: 10px;
    font-size: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .button {
    transition: none;
  }
}