:root {
  color-scheme: light;
  --ink: #1c2430;
  --muted: #627084;
  --line: #dce3ec;
  --paper: #fbf8f1;
  --surface: #ffffff;
  --blue: #246bfe;
  --teal: #078c7f;
  --rose: #d96b80;
  --gold: #b57a1a;
  --shadow: 0 22px 60px rgba(29, 37, 49, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
  padding: 14px clamp(20px, 5vw, 64px);
  background: rgba(251, 248, 241, 0.9);
  border-bottom: 1px solid rgba(220, 227, 236, 0.72);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  font-weight: 760;
  font-size: 18px;
}

.brand img,
.app-top img {
  border-radius: 18px;
  box-shadow: 0 10px 24px rgba(28, 36, 48, 0.18);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 15px;
}

.nav-links a:hover,
.footer-links a:hover {
  color: var(--blue);
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: clamp(36px, 6vw, 84px);
  align-items: center;
  min-height: calc(100svh - 72px);
  padding: clamp(56px, 8vw, 96px) clamp(20px, 5vw, 64px) clamp(44px, 7vw, 72px);
  overflow: hidden;
}

.hero-backdrop {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(115deg, rgba(36, 107, 254, 0.12), transparent 38%),
    radial-gradient(circle at 78% 20%, rgba(7, 140, 127, 0.14), transparent 34%),
    linear-gradient(180deg, #fbf8f1 0%, #f4f7f9 100%);
  pointer-events: none;
}

.hero-content,
.phone-scene {
  position: relative;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--teal);
  font-size: 14px;
  font-weight: 760;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-size: clamp(64px, 12vw, 150px);
  line-height: 0.94;
  font-weight: 820;
}

h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.12;
}

h3 {
  margin: 18px 0 10px;
  font-size: 22px;
  line-height: 1.25;
}

.hero-copy {
  max-width: 620px;
  margin: 28px 0 0;
  color: #374456;
  font-size: clamp(20px, 2.6vw, 30px);
  line-height: 1.45;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 8px;
  font-weight: 720;
}

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

.button.secondary {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid var(--line);
}

.phone-scene {
  display: flex;
  justify-content: center;
}

.phone-frame {
  width: min(100%, 390px);
  min-height: 620px;
  padding: 20px;
  background: #f8fafc;
  border: 10px solid #1c2430;
  border-radius: 42px;
  box-shadow: var(--shadow);
}

.phone-status,
.app-top,
.summary-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.phone-status {
  margin-bottom: 20px;
  color: #4a5668;
  font-size: 13px;
  font-weight: 720;
}

.app-top {
  justify-content: flex-start;
  margin-bottom: 24px;
}

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

.app-top strong {
  display: block;
  margin-top: 2px;
  font-size: 22px;
  line-height: 1.2;
}

.chat-bubble,
.record-card,
.summary-panel,
.feature-card {
  border: 1px solid var(--line);
  background: var(--surface);
}

.chat-bubble {
  width: fit-content;
  max-width: 90%;
  margin-bottom: 14px;
  padding: 14px 16px;
  border-radius: 18px;
  font-size: 15px;
  line-height: 1.5;
}

.chat-bubble.user {
  margin-left: auto;
  color: #fff;
  background: var(--blue);
  border-color: transparent;
  border-bottom-right-radius: 6px;
}

.chat-bubble.ai {
  border-bottom-left-radius: 6px;
}

.record-card {
  margin-top: 28px;
  padding: 18px;
  border-radius: 8px;
  box-shadow: 0 12px 30px rgba(28, 36, 48, 0.08);
}

.record-card span,
.summary-row span {
  color: var(--muted);
  font-size: 14px;
}

.record-card strong {
  display: block;
  margin-top: 8px;
  font-size: 20px;
}

.record-card p {
  margin: 8px 0 0;
  color: #4a5668;
  font-size: 15px;
}

.section {
  padding: clamp(54px, 8vw, 100px) clamp(20px, 5vw, 64px);
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(28px, 6vw, 72px);
  align-items: start;
  background: #fff;
}

.intro > p,
.review-copy p,
.privacy-points p {
  margin: 0;
  color: #465366;
  font-size: 19px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  background: #f5f0e7;
}

.feature-card {
  min-height: 278px;
  padding: 24px;
  border-radius: 8px;
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  color: #fff;
  background: var(--teal);
  border-radius: 50%;
  font-size: 13px;
  font-weight: 820;
}

.feature-card:nth-child(2) .feature-icon {
  background: var(--blue);
}

.feature-card:nth-child(3) .feature-icon {
  background: var(--rose);
}

.feature-card:nth-child(4) .feature-icon {
  background: var(--gold);
}

.feature-card p {
  margin: 0;
  color: #526074;
  font-size: 16px;
}

.review-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 460px);
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
  background: #eef4f2;
}

.review-copy p {
  max-width: 760px;
  margin-top: 20px;
}

.summary-panel {
  padding: 10px;
  border-radius: 8px;
  box-shadow: 0 18px 44px rgba(28, 36, 48, 0.1);
}

.summary-row {
  min-height: 74px;
  padding: 18px;
  border-bottom: 1px solid var(--line);
}

.summary-row:last-child {
  border-bottom: 0;
}

.summary-row strong {
  max-width: 58%;
  text-align: right;
  line-height: 1.35;
}

.privacy {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(28px, 6vw, 72px);
  background: #ffffff;
}

.privacy-points {
  display: grid;
  gap: 14px;
}

.privacy-points p {
  padding: 18px 20px;
  border-left: 4px solid var(--teal);
  background: #f7faf9;
}

.site-footer {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 28px;
  padding: 30px clamp(20px, 5vw, 64px);
  color: #dce3ec;
  background: #1c2430;
}

.site-footer p {
  margin: 6px 0 0;
  color: #aeb9c9;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
  color: #edf2f7;
}

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

  .hero {
    min-height: auto;
  }

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

@media (max-width: 640px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
    min-height: auto;
  }

  .nav-links {
    width: 100%;
    justify-content: space-between;
    gap: 12px;
  }

  .hero {
    padding-top: 40px;
  }

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

  .button {
    width: 100%;
  }

  .phone-frame {
    min-height: 560px;
    border-width: 8px;
    border-radius: 34px;
  }

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

  .feature-card {
    min-height: auto;
  }

  .summary-row {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }

  .summary-row strong {
    max-width: 100%;
    text-align: left;
  }

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

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