:root {
  --ink: #14213d;
  --muted: #65758b;
  --line: #dce6f2;
  --blue: #1677ff;
  --blue-dark: #0b4fb3;
  --green: #19a974;
  --paper: #ffffff;
  --wash: #f4f8fc;
  --soft: #eaf3ff;
  --shadow: 0 24px 80px rgba(20, 33, 61, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--wash);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  line-height: 1.7;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 40px;
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid rgba(220, 230, 242, 0.8);
  backdrop-filter: blur(12px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 190px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  color: #fff;
  font-weight: 800;
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 18px;
}

.brand small {
  color: var(--muted);
  font-size: 12px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: #334155;
  font-size: 15px;
}

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

.hero {
  position: relative;
  overflow: hidden;
  min-height: 720px;
  padding: 82px 40px 72px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(110deg, rgba(244, 248, 252, 0.96), rgba(244, 248, 252, 0.82)),
    url("./assets/hero-pattern.svg") center/cover no-repeat;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(360px, 1.1fr);
  gap: 56px;
  align-items: center;
  max-width: 1180px;
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--blue);
  font-weight: 800;
}

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

h1 {
  margin-bottom: 22px;
  font-size: 48px;
  line-height: 1.18;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 14px;
  font-size: 34px;
  line-height: 1.28;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
  font-size: 20px;
}

.hero-text,
.section-head p,
.workflow-copy p,
.split p,
.contact p,
.download-card p {
  color: var(--muted);
  font-size: 18px;
}

.hero-actions,
.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border-radius: 8px;
  border: 1px solid var(--line);
  font-weight: 800;
}

.btn.primary {
  color: #fff;
  border-color: var(--blue);
  background: var(--blue);
  box-shadow: 0 10px 30px rgba(22, 119, 255, 0.26);
}

.btn.secondary {
  background: #fff;
  color: var(--blue-dark);
}

.trust-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.trust-line span {
  padding: 5px 10px;
  border-radius: 6px;
  color: #22577a;
  background: #e5f2ff;
  font-size: 14px;
}

.product-visual {
  margin: 0;
}

.mock-window {
  overflow: hidden;
  border-radius: 8px;
  background: var(--paper);
  box-shadow: var(--shadow);
  border: 1px solid rgba(220, 230, 242, 0.9);
}

.mock-topbar {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 48px;
  padding: 0 18px;
  background: #f7fbff;
  border-bottom: 1px solid var(--line);
}

.mock-topbar span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #a6b7cc;
}

.mock-topbar strong {
  margin-left: 10px;
  color: #334155;
}

.mock-body {
  display: grid;
  grid-template-columns: 150px 1fr;
  min-height: 420px;
}

.mock-body aside {
  padding: 26px 20px;
  background: #f2f7fd;
  border-right: 1px solid var(--line);
}

.mock-body aside b,
.mock-body aside span {
  display: block;
}

.mock-body aside b {
  margin-bottom: 24px;
}

.mock-body aside span {
  width: 86%;
  height: 12px;
  margin: 16px 0;
  border-radius: 99px;
  background: #d8e5f5;
}

.mock-body section {
  padding: 28px;
}

.mock-title {
  width: 52%;
  height: 26px;
  border-radius: 6px;
  background: #1d4ed8;
}

.mock-filter {
  width: 100%;
  height: 42px;
  margin: 22px 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdff;
}

.mock-question {
  padding: 18px;
  margin-bottom: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.mock-question i {
  display: block;
  width: 64px;
  height: 22px;
  margin-bottom: 14px;
  border-radius: 5px;
  background: #e3f2ff;
}

.mock-question p {
  height: 12px;
  border-radius: 99px;
  background: #dbe7f5;
}

.mock-question p:nth-of-type(1) {
  width: 96%;
}

.mock-question p:nth-of-type(2) {
  width: 72%;
}

.mock-tags {
  display: flex;
  gap: 8px;
  margin-top: 18px;
}

.mock-tags em {
  width: 74px;
  height: 24px;
  border-radius: 5px;
  background: #e9f8ef;
}

.section {
  max-width: 1180px;
  margin: 0 auto;
  padding: 86px 40px;
}

.section-head {
  max-width: 720px;
  margin-bottom: 34px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.feature-grid article,
.steps div,
.download-card,
.split,
.contact {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 10px 32px rgba(20, 33, 61, 0.06);
}

.feature-grid article {
  padding: 26px;
}

.feature-grid p,
.steps p,
.check-list {
  color: var(--muted);
}

.icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: 18px;
  border-radius: 8px;
  color: #fff;
  font-weight: 800;
  background: linear-gradient(135deg, var(--blue), var(--green));
}

.band {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: 34px;
  align-items: start;
  max-width: none;
  padding-left: max(40px, calc((100vw - 1180px) / 2 + 40px));
  padding-right: max(40px, calc((100vw - 1180px) / 2 + 40px));
  background: #eaf3ff;
}

.steps {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.steps div {
  padding: 24px;
}

.steps b {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  margin-bottom: 14px;
  border-radius: 50%;
  color: #fff;
  background: var(--blue);
}

.download-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  padding: 34px;
}

.download-actions {
  justify-content: flex-end;
  margin: 0;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 38px;
  padding: 44px;
}

.check-list {
  margin: 0;
  padding-left: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 28px;
  margin: 10px 0;
}

.check-list li::before {
  position: absolute;
  left: 0;
  color: var(--green);
  content: "✓";
  font-weight: 800;
}

.contact {
  text-align: center;
  background: linear-gradient(135deg, #ffffff, #eff7ff);
}

.contact strong {
  color: var(--blue);
}

.brand-belief {
  margin-top: -36px;
}

.brand-belief,
.tutorial-media,
.faq-section {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 10px 32px rgba(20, 33, 61, 0.06);
}

.brand-belief p,
.tutorial-media p {
  max-width: 860px;
  color: var(--muted);
  font-size: 18px;
}

.tutorial-media {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 30px;
  align-items: center;
}

.video-box video {
  display: block;
  width: 100%;
  max-height: 420px;
  border-radius: 8px;
  background: #111827;
}

.video-placeholder {
  display: grid;
  place-items: center;
  min-height: 280px;
  padding: 24px;
  border: 1px dashed #9fc4ff;
  border-radius: 8px;
  color: var(--blue-dark);
  background: #f5f9ff;
  text-align: center;
}

.video-placeholder strong,
.video-placeholder span {
  display: block;
}

.faq-list {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.faq-list details {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdff;
}

.faq-list summary {
  cursor: pointer;
  font-weight: 800;
}

.faq-list p {
  margin: 12px 0 0;
  color: var(--muted);
}

.contact {
  text-align: left;
}

.contact-head {
  max-width: 860px;
  margin-bottom: 28px;
}

.contact-grid {
  display: grid;
  grid-template-columns: 0.85fr 1fr 1.1fr;
  gap: 18px;
}

.wechat-card,
.service-card,
.message-card {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.qr-box {
  display: grid;
  place-items: center;
  min-height: 190px;
  margin-bottom: 16px;
  border: 1px dashed #9fc4ff;
  border-radius: 8px;
  color: var(--blue-dark);
  background: #f5f9ff;
  text-align: center;
}

.qr-box img {
  display: block;
  max-width: 210px;
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.qr-box span,
.qr-box small {
  display: block;
}

.message-card label {
  display: block;
  margin: 12px 0;
  font-weight: 800;
}

.message-card input,
.message-card select,
.message-card textarea {
  width: 100%;
  margin-top: 7px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font: inherit;
  background: #fff;
}

.form-status {
  min-height: 24px;
  margin: 10px 0 0;
  color: var(--blue-dark);
}

.float-actions {
  position: fixed;
  right: 18px;
  bottom: 20px;
  z-index: 30;
  display: grid;
  gap: 10px;
}

.float-actions a,
.float-actions button {
  min-width: 136px;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--blue);
  border-radius: 999px;
  color: #fff;
  background: var(--blue);
  box-shadow: 0 10px 28px rgba(22, 119, 255, 0.26);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.site-footer {
  display: flex;
  justify-content: center;
  gap: 22px;
  padding: 34px 20px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  background: #fff;
}

@media (max-width: 920px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 20px;
  }

  .nav {
    flex-wrap: wrap;
    gap: 12px 18px;
  }

  .hero {
    padding: 58px 20px;
  }

  .hero-inner,
  .band,
  .split,
  .download-card,
  .tutorial-media,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 36px;
  }

  h2 {
    font-size: 28px;
  }

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

  .section {
    padding: 62px 20px;
  }

  .band {
    padding-left: 20px;
    padding-right: 20px;
  }

  .mock-body {
    grid-template-columns: 1fr;
  }

  .mock-body aside {
    display: none;
  }

  .download-actions {
    justify-content: flex-start;
  }

  .float-actions {
    left: 12px;
    right: 12px;
    bottom: 12px;
    grid-template-columns: 1fr 1fr;
  }

  .float-actions a,
  .float-actions button {
    min-width: 0;
    border-radius: 8px;
  }

  body {
    padding-bottom: 78px;
  }
}

@media (max-width: 560px) {
  .hero-actions .btn,
  .download-actions .btn {
    width: 100%;
  }

  .site-footer {
    flex-direction: column;
    align-items: center;
  }
}