:root {
  --canvas: #f7f7f8;
  --surface: #ffffff;
  --surface-muted: #f1f3f4;
  --ink: #202426;
  --ink-muted: #7d848c;
  --hairline: #e3e6e8;
  --brand: #2f6f5c;
  --brand-dark: #263f36;
  --danger: #c0392b;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--canvas);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--canvas);
}

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

.page {
  min-height: 100vh;
}

.nav {
  position: sticky;
  top: 16px;
  z-index: 10;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  width: min(1120px, calc(100% - 32px));
  height: 64px;
  margin: 16px auto 0;
  padding: 0 18px;
  border: 1px solid var(--hairline);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(18px);
  box-shadow: 0 18px 60px -42px rgba(15, 23, 42, 0.42);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}

.brand-mark {
  display: block;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 12px 28px -22px rgba(15, 23, 42, 0.52);
}

.nav-center,
.nav-actions {
  display: flex;
  align-items: center;
}

.nav-center {
  justify-content: center;
  gap: 24px;
  color: var(--ink-muted);
  font-size: 14px;
  font-weight: 560;
}

.nav-actions {
  justify-content: flex-end;
  gap: 10px;
}

.nav-login {
  display: inline-flex;
  height: 40px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  background: white;
  padding: 0 16px;
  font-size: 14px;
  font-weight: 650;
}

.nav-cta,
.button-primary,
.button-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 16px;
  font-weight: 650;
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.nav-cta {
  height: 40px;
  padding: 0 16px;
  background: var(--brand-dark);
  color: white;
}

.button-primary {
  min-height: 52px;
  padding: 14px 22px;
  background: var(--brand-dark);
  color: white;
}

.button-secondary {
  min-height: 52px;
  padding: 14px 22px;
  border: 1px solid var(--hairline);
  background: white;
  color: var(--ink);
}

.nav-cta:hover,
.button-primary:hover,
.button-secondary:hover {
  transform: translateY(-1px);
}

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
  width: min(1120px, calc(100% - 40px));
  min-height: calc(100vh - 96px);
  margin: 0 auto;
  padding: 76px 0 96px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 22px;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  background: white;
  padding: 7px 12px;
  color: var(--brand);
  font-size: 13px;
  font-weight: 650;
}

.hero h1,
.page-title {
  margin: 0;
  color: var(--ink);
  font-size: clamp(42px, 7vw, 74px);
  font-weight: 720;
  letter-spacing: 0;
  line-height: 1.03;
}

.hero p,
.lead {
  margin: 24px 0 0;
  max-width: 620px;
  color: var(--ink-muted);
  font-size: 18px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.hint {
  margin-top: 14px;
  color: var(--ink-muted);
  font-size: 13px;
}

.product-window {
  position: relative;
  min-height: 540px;
  border: 1px solid var(--hairline);
  border-radius: 34px;
  background: white;
  box-shadow: 0 28px 80px -54px rgba(15, 23, 42, 0.46);
  overflow: hidden;
}

.window-bar {
  display: flex;
  gap: 8px;
  height: 46px;
  align-items: center;
  padding: 0 18px;
  border-bottom: 1px solid var(--hairline);
  background: #fafafa;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 999px;
}

.dot.red { background: #ff5f57; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #28c840; }

.assistant-preview {
  display: grid;
  min-height: 494px;
  place-items: center;
  padding: 34px;
}

.assistant-card {
  width: min(360px, 100%);
  border: 1px solid var(--hairline);
  border-radius: 28px;
  background: var(--canvas);
  padding: 28px;
}

.assistant-core {
  display: block;
  width: 124px;
  height: 124px;
  margin: 0 auto 24px;
  border-radius: 36px;
  object-fit: cover;
  box-shadow: 0 24px 58px -36px rgba(15, 23, 42, 0.52);
}

.assistant-card h2 {
  margin: 0;
  text-align: center;
  font-size: 24px;
}

.assistant-card p {
  margin: 12px 0 0;
  color: var(--ink-muted);
  line-height: 1.7;
  text-align: center;
}

.section {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 96px 0;
}

.section h2 {
  margin: 0;
  max-width: 760px;
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1.12;
  letter-spacing: 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 34px;
}

.feature,
.price-card,
.step,
.faq-item,
.login-panel {
  border: 1px solid var(--hairline);
  border-radius: 26px;
  background: white;
  padding: 28px;
  box-shadow: 0 18px 60px -52px rgba(15, 23, 42, 0.36);
}

.feature h3,
.price-card h2,
.step h2 {
  margin: 0;
  font-size: 24px;
}

.feature p,
.price-card p,
.step p,
.faq-item p {
  color: var(--ink-muted);
  line-height: 1.75;
}

.privacy-band {
  border-radius: 34px;
  background: var(--brand-dark);
  color: white;
  padding: 44px;
}

.privacy-band p {
  color: rgba(255, 255, 255, 0.76);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 40px;
}

.price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-top: 20px;
}

.price strong {
  font-size: 48px;
}

.price-list {
  margin: 24px 0;
  padding: 0;
  list-style: none;
}

.price-list li {
  padding: 10px 0;
  border-top: 1px solid var(--hairline);
  color: var(--ink-muted);
}

.tutorial-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.tutorial-nav a {
  border: 1px solid var(--hairline);
  border-radius: 999px;
  background: white;
  padding: 8px 13px;
  color: var(--ink-muted);
  font-size: 14px;
  font-weight: 600;
}

.steps {
  display: grid;
  gap: 16px;
  margin-top: 36px;
}

.footer {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 42px 0 56px;
  border-top: 1px solid var(--hairline);
  color: var(--ink-muted);
  font-size: 14px;
}

.footer-row {
  display: flex;
  justify-content: space-between;
  gap: 18px;
}

.footer-links {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 28px;
}

.login-page {
  display: grid;
  min-height: calc(100vh - 184px);
  place-items: center;
  padding: 86px 20px 110px;
}

.login-panel {
  border: 0;
  box-shadow: none;
  background: transparent;
  width: min(520px, 100%);
  padding: 0;
}

.login-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--ink);
  font-size: 34px;
  font-weight: 760;
}

.login-panel input {
  width: 100%;
  height: 54px;
  margin-top: 18px;
  border: 1px solid var(--hairline);
  border-radius: 16px;
  padding: 0 16px;
  color: var(--ink);
  font: inherit;
}

.login-panel .button-primary,
.login-panel .button-secondary,
.login-submit {
  width: 100%;
  margin-top: 14px;
}

.flow-badge {
  width: max-content;
  margin: 16px auto 0;
  border-radius: 999px;
  background: #f6eee9;
  padding: 8px 18px;
  color: #cf8b6c;
  font-size: 14px;
  font-weight: 650;
}

.login-panel .lead {
  margin: 22px auto 0;
  text-align: center;
}

.login-divider {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 18px;
  margin-top: 28px;
  color: #c4c7cc;
  font-style: normal;
}

.login-divider span {
  height: 1px;
  background: var(--hairline);
}

.login-divider em {
  font-style: normal;
}

.login-code-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 156px;
  gap: 14px;
  margin-top: 14px;
}

.login-code-row input {
  margin-top: 0;
}

.code-button {
  min-height: 54px;
  margin-top: 0;
  border-radius: 16px;
  font: inherit;
  color: var(--ink-muted);
}

.login-submit {
  border: 0;
  cursor: pointer;
  font: inherit;
}

.button-google img {
  width: 20px;
  height: 20px;
}

@media (max-width: 860px) {
  .nav {
    position: static;
    grid-template-columns: 1fr;
    height: auto;
    gap: 14px;
    width: calc(100% - 24px);
    padding: 14px;
  }

  .nav-center,
  .nav-actions {
    justify-content: center;
    gap: 12px;
  }

  .hero,
  .grid,
  .pricing-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 48px;
  }

  .product-window {
    min-height: 440px;
  }

  .section {
    padding: 68px 0;
  }

  .footer-row {
    flex-direction: column;
  }

  .login-code-row {
    grid-template-columns: 1fr;
  }
}