:root {
  --bg: #fff8fb;
  --surface: #ffffff;
  --surface-soft: #fff2f7;
  --text: #302733;
  --muted: #766874;
  --hair: #f0d8e2;
  --brand: #f45f93;
  --brand-dark: #d64f7f;
  --ink: #302733;
  --blue: #2d6eaa;
  --blue-soft: #f2f8ff;
  --green: #3e8a67;
  --container: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "PingFang SC", "Microsoft YaHei",
    "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

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

a:hover {
  color: var(--brand-dark);
}

.container {
  width: min(var(--container), calc(100% - 40px));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--hair);
}

.topbar__inner {
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 760;
}

.brand__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--brand);
}

.topbar__nav {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--muted);
}

.topbar__nav a {
  padding: 7px 10px;
  border-radius: 8px;
}

.topbar__nav a:hover {
  background: var(--surface-soft);
  color: var(--text);
}

.hero {
  padding: 48px 0 24px;
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.68fr);
  gap: 48px;
  align-items: center;
}

.hero__left {
  max-width: 680px;
}

.app {
  display: flex;
  align-items: center;
  gap: 16px;
}

.app__icon {
  width: 88px;
  height: 88px;
  border-radius: 20px;
  border: 1px solid var(--hair);
  background: var(--surface);
}

.app__name {
  margin: 0;
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.15;
  letter-spacing: 0;
}

.app__sub {
  margin: 8px 0 0;
  color: var(--muted);
}

.hero__desc {
  max-width: 620px;
  margin: 22px 0 0;
  font-size: 16px;
  color: #5f5360;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 0;
}

.btn {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid var(--hair);
  background: var(--surface);
  color: var(--text);
  font-size: 14px;
  font-weight: 680;
  letter-spacing: 0;
}

.btn:hover {
  color: var(--text);
  border-color: var(--brand);
}

.btn--primary {
  background: var(--brand);
  border-color: var(--brand);
  color: #ffffff;
}

.btn--primary:hover {
  background: var(--brand-dark);
  border-color: var(--brand-dark);
  color: #ffffff;
}

.btn--secondary {
  background: var(--ink);
  border-color: var(--ink);
  color: #ffffff;
}

.btn--secondary:hover {
  background: #4a3d4a;
  border-color: #4a3d4a;
  color: #ffffff;
}

.btn--ghost {
  background: var(--blue-soft);
  border-color: #c7dcf1;
  color: var(--blue);
}

.btn--ghost:hover {
  background: #e7f2ff;
  border-color: #9ec5e8;
  color: var(--blue);
}

.hero__right {
  width: 100%;
  max-width: 360px;
  justify-self: end;
}

.phone {
  border-radius: 22px;
  padding: 8px;
  background: var(--surface);
  border: 1px solid var(--hair);
}

.phone__frame {
  display: none;
}

.phone__screen {
  aspect-ratio: 9 / 16;
  border-radius: 14px;
  overflow: hidden;
  background: var(--surface-soft);
}

.shot,
.thumb img,
.tile img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.thumbs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-top: 10px;
}

.thumb {
  aspect-ratio: 9 / 16;
  padding: 0;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--hair);
  background: var(--surface);
  cursor: pointer;
}

.thumb[aria-current="true"] {
  border-color: var(--brand);
}

.section {
  padding: 42px 0;
}

.section--alt {
  background: var(--surface);
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
}

.section__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.section__title {
  margin: 0 0 16px;
  font-size: 22px;
  line-height: 1.3;
  letter-spacing: 0;
}

.section__head .section__title {
  margin: 0;
}

.section__actions {
  display: flex;
  gap: 8px;
}

.chip {
  border: 1px solid var(--hair);
  background: var(--surface);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 13px;
  font-weight: 650;
  cursor: pointer;
}

.chip:hover {
  border-color: var(--brand);
}

.gallery {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.tile {
  aspect-ratio: 9 / 16;
  border-radius: 8px;
  border: 1px solid var(--hair);
  background: var(--surface);
  overflow: hidden;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.card {
  border-radius: 8px;
  border: 1px solid var(--hair);
  border-top: 3px solid var(--brand);
  background: var(--surface);
  padding: 16px;
}

.card:nth-child(3n + 2) {
  border-top-color: var(--blue);
}

.card:nth-child(3n) {
  border-top-color: var(--green);
}

.card__title {
  margin: 0 0 8px;
  font-size: 16px;
}

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

.intro {
  display: grid;
  gap: 18px;
}

.intro__head {
  max-width: 860px;
}

.intro__head p {
  margin: 0 0 10px;
  color: #5f5360;
}

.introGrid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.introItem {
  border-radius: 8px;
  border: 1px solid var(--hair);
  background: var(--surface);
  padding: 14px;
}

.introItem h3 {
  margin: 0 0 6px;
  font-size: 15px;
}

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

.intro__contact {
  margin: 0;
  padding: 14px;
  border-radius: 8px;
  border: 1px solid var(--hair);
  background: var(--surface-soft);
  color: #5f5360;
}

.intro__contact a {
  color: var(--brand-dark);
  font-weight: 680;
}

.cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 20px;
  border-radius: 8px;
  border: 1px solid var(--hair);
  background: var(--surface);
}

.cta__title {
  margin: 0;
  font-size: 20px;
}

.cta__desc {
  margin: 6px 0 0;
  color: var(--muted);
}

.cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (max-width: 980px) {
  .hero__grid {
    grid-template-columns: 1fr;
  }

  .hero__right {
    justify-self: center;
  }

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

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

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

  .cta {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(var(--container), calc(100% - 28px));
  }

  .topbar__nav {
    display: none;
  }

  .hero {
    padding-top: 32px;
  }

  .app {
    align-items: flex-start;
  }

  .app__icon {
    width: 72px;
    height: 72px;
    border-radius: 16px;
  }

  .actions .btn,
  .cta__actions .btn {
    width: 100%;
  }

  .actions,
  .cta__actions {
    width: 100%;
  }

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

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

}