:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f8;
  --text: #171717;
  --muted: #727272;
  --line: #e8e8e8;
  --blue: #0a84ff;
  --blue-soft: #dff0ff;
  --green-soft: #e8f9ee;
  --yellow: #ffe9a8;
  --footer: #1b1b1b;
  --radius-xl: 40px;
  --radius-lg: 28px;
  --shadow: 0 26px 70px rgba(20, 29, 43, 0.12);
  font-family:
    -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  padding: 18px clamp(22px, 5vw, 64px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(22px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 18px;
  font-weight: 600;
}

.brand img,
.footer-brand img {
  width: 34px;
  height: 34px;
  border-radius: 9px;
}

.nav-links {
  display: inline-flex;
  align-items: center;
  gap: clamp(16px, 3vw, 34px);
  font-size: 15px;
  font-weight: 500;
}

.nav-links a {
  color: #222;
}

.nav-links .nav-cta {
  padding: 10px 16px;
  border-radius: 999px;
  background: #111;
  color: #fff;
}

.section-wrap {
  width: min(1500px, calc(100% - 48px));
  margin: 0 auto;
}

.hero {
  display: grid;
  justify-items: center;
  gap: 64px;
  min-height: 800px;
  padding: 118px 0 96px;
}

.hero-copy {
  max-width: 940px;
  text-align: center;
}

.hero-icon {
  width: 96px;
  height: 96px;
  margin-bottom: 30px;
  border-radius: 22px;
  box-shadow: 0 18px 36px rgba(10, 132, 255, 0.2);
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0;
}

.eyebrow.blue {
  color: var(--blue);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  font-weight: 600;
}

.hero h1 {
  max-width: 900px;
  margin-bottom: 28px;
  font-size: clamp(64px, 8vw, 124px);
  line-height: 0.98;
  letter-spacing: 0;
  font-weight: 600;
}

.hero-lede {
  max-width: 720px;
  margin-right: auto;
  margin-bottom: 36px;
  margin-left: auto;
  color: #606060;
  font-size: clamp(19px, 2.1vw, 26px);
  line-height: 1.62;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.hero-actions.compact {
  justify-content: center;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 54px;
  padding: 0 24px;
  border-radius: 16px;
  font-size: 17px;
  font-weight: 600;
}

.button-primary {
  background: #111;
  color: #fff;
}

.button-secondary {
  background: var(--bg-soft);
  color: #111;
}

.hero-visual {
  display: flex;
  justify-content: center;
  width: min(1120px, 100%);
}

.hero-shot,
.feature-shot {
  display: block;
  width: 100%;
  height: auto;
  box-shadow: var(--shadow);
}

.hero-shot {
  border-radius: 36px;
}

.feature-shot {
  max-width: 560px;
  max-height: 760px;
  border-radius: 32px;
}

.screenshot-panel {
  display: flex;
  justify-content: center;
}

.feature-shot-panel {
  align-self: center;
}

.problem-band {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1fr);
  gap: clamp(36px, 7vw, 96px);
  align-items: start;
  padding: 72px 0 88px;
  border-top: 1px solid var(--line);
}

.problem-band h2 {
  margin-bottom: 0;
  font-size: clamp(42px, 5vw, 78px);
  line-height: 1.05;
}

.problem-band p {
  color: #686868;
  font-size: clamp(18px, 1.8vw, 24px);
  line-height: 1.72;
  font-weight: 400;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(64px, 8vw, 110px) clamp(60px, 7vw, 120px);
  align-items: center;
  padding: 60px 0 120px;
}

.feature-grid article h2,
.workflow h2,
.download-card h2 {
  margin-bottom: 22px;
  font-size: clamp(42px, 4.8vw, 72px);
  line-height: 1.06;
}

.feature-grid article p,
.workflow p,
.download-card p {
  color: #686868;
  font-size: clamp(18px, 1.8vw, 24px);
  line-height: 1.72;
  font-weight: 400;
}

.illustration-panel {
  position: relative;
  min-height: 560px;
  padding: 60px;
  overflow: hidden;
  border-radius: var(--radius-xl);
}

.yellow-panel {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 26px;
  background: var(--yellow);
}

.reader-card {
  align-self: center;
  width: min(560px, 100%);
  padding: 34px;
  border-radius: 26px;
  background: #fff;
}

.reader-card.small {
  margin-left: 10%;
  background: rgba(255, 255, 255, 0.72);
}

.reader-card small {
  display: block;
  margin-bottom: 13px;
  color: #777;
  font-size: 17px;
  font-weight: 500;
}

.reader-card strong {
  display: block;
  margin-bottom: 12px;
  font-size: 26px;
}

.reader-card p {
  margin: 0;
  color: #555;
  font-size: 19px;
  line-height: 1.58;
}

.workflow {
  padding: 110px 0;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  margin-top: 42px;
}

.step {
  min-height: 260px;
  padding: 30px;
  border-radius: 26px;
  background: var(--bg-soft);
}

.step span {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 50%;
  background: var(--blue-soft);
  color: var(--blue);
  font-size: 21px;
  font-weight: 600;
}

.step h3 {
  margin: 28px 0 10px;
  font-size: 24px;
}

.step p {
  margin: 0;
  font-size: 18px;
  line-height: 1.68;
}

.download-card {
  margin-bottom: 160px;
  padding: 92px 32px;
  border-radius: var(--radius-xl);
  background: var(--bg-soft);
  text-align: center;
}

.download-card p {
  width: min(790px, 100%);
  margin: 0 auto 34px;
}

.site-footer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 60px;
  padding: 72px clamp(24px, 6vw, 96px) 36px;
  background: var(--footer);
  color: #fff;
}

.footer-brand {
  max-width: 420px;
}

.footer-brand strong {
  display: block;
  margin-top: 18px;
  font-size: 21px;
}

.footer-brand p {
  margin-top: 12px;
  color: rgba(255, 255, 255, 0.56);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: clamp(56px, 10vw, 140px);
}

.footer-links h2 {
  margin-bottom: 22px;
  color: rgba(255, 255, 255, 0.36);
  font-size: 16px;
}

.footer-links a {
  display: block;
  margin-bottom: 18px;
  color: rgba(255, 255, 255, 0.78);
  font-weight: 500;
}

.footer-bottom {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  margin-top: 70px;
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.42);
}

.compact-footer {
  display: block;
}

.compact-footer .footer-bottom {
  margin-top: 0;
}

.legal-page {
  width: min(980px, calc(100% - 40px));
  margin: 0 auto;
  padding: 88px 0 120px;
}

.legal-card {
  padding: clamp(28px, 6vw, 70px);
  border-radius: var(--radius-xl);
  background: var(--bg-soft);
}

.legal-card h1 {
  margin-bottom: 12px;
  font-size: clamp(44px, 8vw, 78px);
  line-height: 1;
}

.legal-date {
  color: var(--muted);
}

.legal-card section {
  margin-top: 52px;
}

.legal-card h2 {
  margin-bottom: 22px;
  font-size: 32px;
}

.legal-card h3 {
  margin: 28px 0 10px;
  font-size: 22px;
}

.legal-card p,
.legal-card li {
  color: #555;
  font-size: 18px;
  line-height: 1.76;
}

.legal-card a {
  color: var(--blue);
  font-weight: 500;
}

.email-text {
  color: var(--text);
  font-weight: 500;
}

@media (max-width: 980px) {
  .hero,
  .feature-grid,
  .problem-band {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 64px;
  }

  .hero-visual {
    justify-content: center;
  }

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

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

@media (max-width: 720px) {
  .site-header {
    min-height: 66px;
    padding: 14px 18px;
  }

  .brand span {
    display: none;
  }

  .nav-links {
    gap: 14px;
    font-size: 14px;
  }

  .nav-links a:first-child {
    display: none;
  }

  .section-wrap {
    width: min(100% - 28px, 1500px);
  }

  .hero h1 {
    font-size: 52px;
  }

  .hero-lede {
    font-size: 18px;
  }

  .illustration-panel {
    min-height: 460px;
    padding: 30px;
    border-radius: 30px;
  }

  .feature-grid {
    gap: 42px;
    padding-bottom: 72px;
  }

  .workflow {
    padding: 62px 0;
  }

  .download-card {
    margin-bottom: 96px;
  }
}

@media (max-width: 430px) {
  .nav-links a:nth-child(2) {
    display: none;
  }

  .button {
    width: 100%;
  }

  .hero-actions {
    width: 100%;
  }
}