:root {
  --bg: #f5f9ff;
  --surface: #ffffff;
  --ink: #10203b;
  --text: #34415a;
  --muted: #6f7b90;
  --line: #e3eaf5;
  --blue: #2c6cff;
  --blue-deep: #1957e8;
  --cyan: #22c3c1;
  --green: #22c58f;
  --violet: #7457f6;
  --orange: #ff7a1a;
  --shadow: 0 14px 36px rgba(35, 78, 139, 0.12);
  --soft-shadow: 0 10px 26px rgba(25, 67, 126, 0.08);
  --radius: 8px;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: #fff;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  min-height: 72px;
  padding: 0 max(24px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid rgba(227, 234, 245, 0.86);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
}

.brand,
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  font-weight: 800;
}

.brand {
  font-size: 19px;
}

.brand-logo {
  display: block;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  border-radius: 9px;
  object-fit: cover;
  box-shadow: 0 10px 20px rgba(44, 108, 255, 0.18);
}

.top-nav {
  display: none;
  justify-content: flex-end;
  gap: 44px;
  color: #25334b;
  font-size: 14px;
  font-weight: 700;
}

.top-nav a {
  transition: color 0.2s ease;
}

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

.header-cta,
.primary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--blue), var(--blue-deep));
  color: #fff;
  font-size: 14px;
  font-weight: 800;
  box-shadow: 0 12px 24px rgba(44, 108, 255, 0.24);
}

.header-cta {
  padding: 0 18px;
  white-space: nowrap;
}

.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 86% 28%, rgba(44, 108, 255, 0.15), transparent 28rem),
    radial-gradient(circle at 8% 88%, rgba(34, 195, 193, 0.12), transparent 26rem),
    linear-gradient(180deg, #f7fbff 0%, #eef6ff 100%);
}

.hero::after {
  position: absolute;
  right: -120px;
  bottom: -120px;
  width: 320px;
  height: 320px;
  content: "";
  border-radius: 999px;
  background: rgba(44, 108, 255, 0.07);
}

.hero-inner,
.section,
.footer-main,
.footer-record {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
  padding: 54px 0 52px;
  align-items: center;
}

.pill {
  display: inline-flex;
  margin: 0 0 18px;
  padding: 7px 14px;
  border-radius: 999px;
  background: #eaf2ff;
  color: var(--blue);
  font-size: 14px;
  font-weight: 800;
  line-height: 1.4;
}

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

h1 {
  margin-bottom: 2px;
  font-size: clamp(36px, 8vw, 52px);
  line-height: 1.14;
  letter-spacing: 0;
}

.hero-title {
  margin-bottom: 20px;
  color: var(--blue);
  font-size: clamp(28px, 7vw, 40px);
  font-weight: 900;
  line-height: 1.18;
}

.hero-desc {
  max-width: 610px;
  margin-bottom: 28px;
  color: var(--text);
  font-size: 16px;
  line-height: 1.95;
}

.hero-qr-card {
  display: grid;
  grid-template-columns: 112px 1fr;
  gap: 18px;
  width: min(100%, 470px);
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--soft-shadow);
}

.hero-qr-card strong {
  display: block;
  margin-bottom: 4px;
  font-size: 17px;
  line-height: 1.45;
}

.hero-qr-card p {
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.65;
}

.primary-btn {
  min-height: 40px;
  padding: 0 18px;
}

.qr-code {
  display: block;
  width: 112px;
  height: 112px;
  border: 1px solid #d8e2ef;
  border-radius: 8px;
  background: #fff;
  object-fit: contain;
}

.hero-device {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 510px;
}

.orbit {
  position: absolute;
  border: 1px dashed rgba(44, 108, 255, 0.2);
  border-radius: 999px;
}

.orbit-one {
  width: 390px;
  height: 390px;
}

.orbit-two {
  width: 286px;
  height: 286px;
}

.float-icon {
  position: absolute;
  z-index: 2;
  display: block;
  width: 78px;
  height: 78px;
  border-radius: 999px;
  object-fit: contain;
  filter: drop-shadow(0 16px 26px rgba(40, 83, 150, 0.14));
}

.float-icon.briefcase {
  left: 6%;
  top: 23%;
}

.float-icon.chart {
  right: 3%;
  top: 42%;
}

.float-icon.message {
  left: 8%;
  bottom: 24%;
}

.phone {
  position: relative;
  z-index: 1;
  width: 324px;
  height: 636px;
  padding: 10px;
  border: 6px solid #141a28;
  border-radius: 42px;
  background: #141a28;
  box-shadow: 0 26px 58px rgba(13, 26, 48, 0.25);
}

.phone-screen {
  width: 100%;
  height: 100%;
  overflow: hidden;
  border-radius: 32px;
  background: #fff;
}

.app-screenshot {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
}

.section {
  padding: 54px 0;
}

.compact-section {
  padding-top: 32px;
}

.section-title {
  max-width: 820px;
  margin: 0 auto 34px;
  text-align: center;
}

.section-title h2 {
  position: relative;
  margin-bottom: 18px;
  font-size: clamp(24px, 5vw, 30px);
  line-height: 1.25;
  letter-spacing: 0;
}

.section-title h2::after {
  position: absolute;
  left: 50%;
  bottom: -9px;
  width: 32px;
  height: 3px;
  content: "";
  border-radius: 999px;
  background: var(--blue);
  transform: translateX(-50%);
}

.section-title p {
  margin: 0;
  color: var(--text);
  font-size: 15px;
  line-height: 1.9;
}

.feature-grid,
.audience-grid {
  display: grid;
  gap: 18px;
}

.feature-card,
.audience-grid article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--soft-shadow);
}

.feature-card {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 18px;
  align-items: center;
  padding: 30px 28px;
}

.feature-card h3,
.audience-grid h3,
.mini-qr-panel h3 {
  margin-bottom: 7px;
  font-size: 18px;
  line-height: 1.35;
}

.feature-card p,
.audience-grid p,
.problem-copy p,
.about-copy p {
  margin-bottom: 0;
  color: var(--text);
  font-size: 15px;
}

.round-icon,
.audience-icon {
  display: block;
  margin: 0 auto;
  object-fit: contain;
}

.round-icon {
  width: 72px;
  height: 72px;
  filter: drop-shadow(0 14px 20px rgba(44, 108, 255, 0.14));
}

.audience-grid article {
  min-height: 190px;
  padding: 26px 18px 24px;
  text-align: center;
}

.audience-icon {
  width: 76px;
  height: 76px;
  margin-bottom: 16px;
  filter: drop-shadow(0 12px 18px rgba(44, 108, 255, 0.1));
}

.problem-section {
  background:
    radial-gradient(circle at 72% 44%, rgba(44, 108, 255, 0.09), transparent 24rem),
    #fff;
}

.problem-layout {
  display: grid;
  gap: 32px;
  align-items: center;
}

.problem-copy {
  display: grid;
  gap: 20px;
}

.problem-copy p {
  line-height: 2;
}

.question-visual {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 330px;
}

.problem-illustration {
  display: block;
  width: min(100%, 640px);
  height: auto;
  object-fit: contain;
}

.mini-banner {
  display: grid;
  gap: 26px;
  align-items: center;
  padding: 34px;
  border-radius: 8px;
  background: linear-gradient(135deg, #196dff 0%, #315ff3 54%, #8a55f8 100%);
  color: #fff;
  box-shadow: 0 18px 44px rgba(62, 91, 228, 0.26);
}

.mini-banner h2 {
  margin-bottom: 8px;
  font-size: clamp(24px, 5vw, 30px);
  line-height: 1.25;
}

.mini-banner p {
  margin-bottom: 20px;
  color: rgba(255, 255, 255, 0.88);
  font-size: 16px;
}

.mini-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.mini-tags span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 800;
}

.mini-tags span::before {
  width: 24px;
  height: 24px;
  content: "";
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.95);
}

.mini-qr-panel {
  display: grid;
  grid-template-columns: 132px 1fr;
  gap: 22px;
  align-items: center;
  padding: 20px;
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
}

.qr-code.large {
  width: 132px;
  height: 132px;
}

.mini-qr-panel p {
  margin-bottom: 8px;
  color: var(--text);
  font-size: 15px;
}

.mini-qr-panel small {
  color: var(--muted);
  font-size: 13px;
}

.about-section {
  padding-top: 34px;
}

.about-layout {
  display: grid;
  gap: 30px;
  align-items: center;
}

.about-copy {
  max-width: 650px;
}

.about-copy p {
  margin-bottom: 0;
  line-height: 2;
}

.city-visual {
  display: grid;
  place-items: end center;
  min-height: 190px;
  padding: 18px 18px 0;
  border-radius: 8px;
  background: linear-gradient(180deg, #f1f7ff, #ffffff);
}

.city-visual img {
  display: block;
  width: min(100%, 520px);
  height: auto;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #fff;
}

.footer-main {
  display: grid;
  gap: 18px;
  align-items: center;
  padding: 28px 0;
  color: #394760;
  font-size: 14px;
}

.footer-brand strong {
  display: block;
  font-size: 18px;
  color: var(--ink);
}

.footer-brand p {
  margin: 0;
  color: var(--muted);
}

.footer-main > a {
  color: #394760;
}

.footer-record {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px 28px;
  padding: 14px 0 18px;
  border-top: 1px solid var(--line);
  color: #66728a;
  font-size: 13px;
}

@media (min-width: 720px) {
  .top-nav {
    display: flex;
  }

  .hero-inner,
  .section,
  .footer-main,
  .footer-record {
    width: min(var(--max), calc(100% - 64px));
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1.02fr) minmax(360px, 0.9fr);
    min-height: 650px;
    padding: 64px 0;
  }

  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .feature-card {
    grid-template-columns: 70px 1fr;
  }

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

  .problem-layout,
  .about-layout {
    grid-template-columns: minmax(0, 0.95fr) minmax(360px, 0.9fr);
  }

  .mini-banner {
    grid-template-columns: minmax(0, 1fr) minmax(430px, 0.82fr);
  }

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

@media (min-width: 980px) {
  .audience-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

@media (max-width: 719px) {
  .site-header {
    grid-template-columns: 1fr auto;
    min-height: 64px;
    padding: 0 18px;
  }

  .brand {
    font-size: 17px;
  }

  .brand-logo {
    width: 36px;
    height: 36px;
  }

  .header-cta {
    min-height: 38px;
    padding: 0 13px;
    font-size: 13px;
  }

  .hero-inner,
  .section,
  .footer-main,
  .footer-record {
    width: calc(100% - 32px);
  }

  .hero-inner {
    padding: 42px 0 46px;
  }

  .hero-desc {
    font-size: 15px;
    line-height: 1.85;
  }

  .hero-qr-card {
    grid-template-columns: 96px 1fr;
    gap: 14px;
    padding: 14px;
  }

  .qr-code {
    width: 96px;
    height: 96px;
  }

  .hero-qr-card strong {
    font-size: 15px;
  }

  .primary-btn {
    width: 100%;
    min-height: 38px;
    font-size: 13px;
  }

  .hero-device {
    min-height: 442px;
    overflow: hidden;
  }

  .phone {
    width: 250px;
    height: 490px;
    transform: translateY(12px);
  }

  .phone-screen {
    height: 100%;
  }

  .orbit-one {
    width: 318px;
    height: 318px;
  }

  .orbit-two {
    width: 238px;
    height: 238px;
  }

  .float-icon {
    width: 52px;
    height: 52px;
  }

  .float-icon.briefcase {
    left: 0;
  }

  .float-icon.chart {
    right: 0;
  }

  .float-icon.message {
    left: 3%;
  }

  .section {
    padding: 42px 0;
  }

  .section-title {
    margin-bottom: 26px;
  }

  .section-title h2 {
    font-size: 25px;
  }

  .section-title p {
    text-align: left;
  }

  .feature-card {
    grid-template-columns: 58px 1fr;
    gap: 15px;
    padding: 20px;
  }

  .round-icon {
    width: 56px;
    height: 56px;
  }

  .audience-icon {
    width: 68px;
    height: 68px;
  }

  .audience-grid article {
    min-height: 0;
    padding: 22px 18px;
  }

  .question-visual {
    min-height: 0;
  }

  .problem-illustration {
    width: min(100%, 420px);
  }

  .mini-banner {
    padding: 24px 18px;
  }

  .mini-qr-panel {
    grid-template-columns: 108px 1fr;
    gap: 16px;
    padding: 16px;
  }

  .qr-code.large {
    width: 108px;
    height: 108px;
  }

  .mini-qr-panel h3 {
    font-size: 19px;
  }

  .city-visual {
    min-height: 150px;
  }
}

@media (max-width: 420px) {
  .hero-qr-card,
  .mini-qr-panel {
    grid-template-columns: 1fr;
  }

  .hero-qr-card .qr-code,
  .mini-qr-panel .qr-code {
    width: 118px;
    height: 118px;
  }

  .mini-banner p {
    font-size: 15px;
  }
}