:root {
  --blue: #116cff;
  --blue-2: #34a1ff;
  --ink: #111827;
  --muted: #667085;
  --line: #e4ebf5;
  --bg: #f3f8ff;
  --green: #17c987;
  --orange: #ff9824;
  --purple: #815cff;
  --shadow: 0 18px 45px rgba(27, 93, 180, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  background: #f8fbff;
}

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

img {
  display: block;
  max-width: 100%;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 0 clamp(20px, 5vw, 72px);
  background: rgba(255, 255, 255, 0.82);
  border-bottom: 1px solid rgba(215, 226, 242, 0.72);
  backdrop-filter: blur(18px);
}

.brand,
.site-nav,
.hero-actions,
.download-actions {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-size: 20px;
  font-weight: 800;
}

.brand-mark {
  position: relative;
  display: block;
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--blue), var(--blue-2));
  border-radius: 8px;
}

.brand-mark::before,
.brand-mark::after {
  position: absolute;
  content: "";
  background: #fff;
}

.brand-mark::before {
  left: 10px;
  top: 10px;
  width: 18px;
  height: 18px;
  border-radius: 5px;
}

.brand-mark::after {
  left: 14px;
  top: 16px;
  width: 10px;
  height: 4px;
  border-radius: 4px;
  box-shadow: 0 7px 0 rgba(255, 255, 255, 0.95);
}

.site-nav {
  gap: 28px;
  color: #465468;
  font-size: 15px;
}

.site-nav a:hover,
.header-action:hover {
  color: var(--blue);
}

.header-action {
  padding: 10px 18px;
  color: #fff;
  font-weight: 700;
  background: var(--blue);
  border-radius: 8px;
  box-shadow: 0 10px 22px rgba(17, 108, 255, 0.22);
}

.hero {
  position: relative;
  min-height: 92vh;
  overflow: hidden;
  display: flex;
  align-items: center;
  padding: 112px clamp(22px, 7vw, 96px) 72px;
  color: #fff;
  background: #0d62ed;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(5, 34, 89, 0.82) 0%, rgba(5, 72, 167, 0.56) 42%, rgba(11, 107, 255, 0.28) 100%),
    url("./pic2/01-首页.png") right 5vw center / auto 108% no-repeat,
    linear-gradient(135deg, #0a58df, #1fb5ff);
}

.hero-bg::after {
  position: absolute;
  inset: auto 0 0;
  height: 26%;
  content: "";
  background: linear-gradient(180deg, rgba(248, 251, 255, 0), #f8fbff);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(680px, 100%);
}

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: #7cc4ff;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0;
}

.hero h1 {
  margin: 0;
  font-size: clamp(58px, 10vw, 116px);
  line-height: 0.96;
  letter-spacing: 0;
}

.hero-copy {
  width: min(560px, 100%);
  margin: 26px 0 0;
  color: rgba(255, 255, 255, 0.88);
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.7;
}

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

.primary-button,
.ghost-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  font-weight: 800;
  border-radius: 8px;
}

.primary-button {
  color: var(--blue);
  background: #fff;
  box-shadow: 0 16px 30px rgba(3, 35, 88, 0.18);
}

.ghost-button {
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.55);
  background: rgba(255, 255, 255, 0.08);
}

.ghost-button.dark {
  color: var(--ink);
  border-color: rgba(17, 24, 39, 0.16);
  background: #fff;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 120px));
  gap: 12px;
  margin: 48px 0 0;
}

.hero-stats div {
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
}

.hero-stats dt {
  font-size: 24px;
  font-weight: 900;
}

.hero-stats dd {
  margin: 5px 0 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
}

.section {
  padding: 88px clamp(20px, 5vw, 72px);
}

.section-inner {
  width: min(1180px, 100%);
  margin: 0 auto;
}

.intro-band {
  padding-top: 54px;
  background: #f8fbff;
}

.intro-grid,
.showcase-grid,
.member-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 56px;
  align-items: center;
}

.intro-grid p:last-child,
.showcase-copy p,
.member-grid p,
.download-inner p {
  margin: 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.8;
}

h2 {
  margin: 0;
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.16;
  letter-spacing: 0;
}

h3 {
  margin: 0;
  letter-spacing: 0;
}

.section-heading {
  width: min(760px, 100%);
  margin-bottom: 34px;
}

.section-heading.compact {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

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

.feature-card {
  min-height: 236px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 12px 34px rgba(30, 80, 140, 0.08);
}

.feature-icon {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  margin-bottom: 26px;
  color: #fff;
  font-weight: 900;
  border-radius: 8px;
}

.accent-blue .feature-icon {
  background: var(--blue);
}

.accent-green .feature-icon {
  background: var(--green);
}

.accent-orange .feature-icon {
  background: var(--orange);
}

.accent-purple .feature-icon {
  background: var(--purple);
}

.feature-card h3 {
  font-size: 24px;
}

.feature-card p {
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.flow-section {
  background: #eef6ff;
}

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

.phone-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
}

.phone-card img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top center;
}

.phone-card h3 {
  padding: 18px 20px 20px;
  font-size: 20px;
}

.showcase-section {
  background:
    radial-gradient(circle at 12% 20%, rgba(23, 201, 135, 0.13), transparent 24%),
    linear-gradient(180deg, #f8fbff, #fff);
}

.showcase-copy {
  align-self: center;
}

.screen-tabs {
  display: flex;
  gap: 10px;
  margin-top: 30px;
  flex-wrap: wrap;
}

.screen-tab {
  min-height: 42px;
  padding: 0 18px;
  color: #405168;
  font: inherit;
  font-weight: 800;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
}

.screen-tab.is-active {
  color: #fff;
  border-color: var(--blue);
  background: var(--blue);
}

.screen-preview {
  display: grid;
  grid-template-columns: minmax(180px, 250px) minmax(0, 1fr);
  gap: 28px;
  align-items: center;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
}

.screen-preview img {
  width: 100%;
  max-height: 560px;
  border-radius: 8px;
  object-fit: cover;
  object-position: top center;
  box-shadow: 0 12px 36px rgba(26, 80, 154, 0.18);
}

.screen-preview h3 {
  font-size: 26px;
}

.screen-preview p {
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.75;
}

.member-section {
  background: #fff;
}

.benefit-list {
  display: grid;
  gap: 14px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.benefit-list li {
  position: relative;
  padding-left: 28px;
  color: #334155;
  font-size: 17px;
}

.benefit-list li::before {
  position: absolute;
  left: 0;
  top: 5px;
  width: 14px;
  height: 14px;
  content: "";
  background: var(--green);
  border-radius: 4px;
}

.member-phone {
  width: min(420px, 100%);
  justify-self: center;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.download-section {
  padding: 96px clamp(20px, 5vw, 72px);
  color: #fff;
  background:
    linear-gradient(90deg, rgba(8, 44, 112, 0.92), rgba(11, 111, 255, 0.78)),
    url("./pic2/13-启动页.png") center / cover no-repeat;
}

.download-inner {
  width: min(880px, 100%);
  margin: 0 auto;
  text-align: center;
}

.download-inner .section-kicker,
.download-inner p {
  color: rgba(255, 255, 255, 0.78);
}

.download-actions {
  justify-content: center;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px clamp(20px, 5vw, 72px);
  color: #617089;
  border-top: 1px solid var(--line);
  background: #fff;
}

@media (max-width: 980px) {
  .site-nav {
    display: none;
  }

  .hero {
    min-height: 86vh;
  }

  .hero-bg {
    background:
      linear-gradient(180deg, rgba(5, 34, 89, 0.82) 0%, rgba(8, 76, 166, 0.68) 48%, rgba(11, 107, 255, 0.36) 100%),
      url("./pic2/01-首页.png") right -90px bottom / auto 78% no-repeat,
      linear-gradient(135deg, #0a58df, #1fb5ff);
  }

  .intro-grid,
  .showcase-grid,
  .member-grid,
  .screen-preview {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 640px) {
  .site-header {
    min-height: 64px;
  }

  .header-action {
    display: none;
  }

  .hero {
    padding-top: 104px;
    padding-bottom: 50px;
  }

  .hero-copy {
    font-size: 17px;
  }

  .hero-stats,
  .feature-grid,
  .flow-grid {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    width: min(360px, 100%);
  }

  .section {
    padding-top: 64px;
    padding-bottom: 64px;
  }

  .screen-preview {
    padding: 16px;
  }

  .screen-preview img {
    width: min(260px, 100%);
    justify-self: center;
  }

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