:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --ink: #172033;
  --muted: #647086;
  --line: #dfe5ef;
  --brand: #1f6feb;
  --brand-dark: #1557bf;
  --accent: #16a085;
  --warn: #d97706;
  --soft: #eaf2ff;
  --shadow: 0 18px 48px rgba(23, 32, 51, 0.12);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
  line-height: 1.72;
}

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

img {
  max-width: 100%;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(223, 229, 239, 0.86);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
}

.nav {
  max-width: 1180px;
  min-height: 68px;
  margin: 0 auto;
  padding: 0 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 21px;
  letter-spacing: 0;
}

.brand-mark {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  display: block;
  object-fit: cover;
  background: #fff;
  border: 1px solid var(--line);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  color: #3d4960;
  font-size: 15px;
}

.nav-links a {
  padding: 9px 13px;
  border-radius: 6px;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--brand);
  background: var(--soft);
}

.btn {
  min-height: 42px;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 10px 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.16s ease, background 0.16s ease, border 0.16s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  color: #fff;
  background: var(--brand);
  box-shadow: 0 12px 22px rgba(31, 111, 235, 0.22);
}

.btn-primary:hover {
  background: var(--brand-dark);
}

.btn-outline {
  color: var(--brand);
  border-color: #b8cdf4;
  background: #fff;
}

.btn-small {
  min-height: 36px;
  padding: 8px 13px;
  font-size: 14px;
}

.hero {
  background: linear-gradient(180deg, #eef5ff 0%, #f5f7fb 100%);
  border-bottom: 1px solid var(--line);
}

.hero-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 70px 22px 42px;
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(360px, 0.76fr);
  gap: 34px;
  align-items: center;
}

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

h1,
h2,
h3 {
  line-height: 1.24;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-size: clamp(34px, 4.4vw, 56px);
}

.hero-copy {
  margin: 18px 0 24px;
  max-width: 700px;
  color: #48566d;
  font-size: 18px;
}

.hero-actions,
.inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.hero-points {
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  list-style: none;
}

.hero-points li {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: #39475d;
  font-weight: 700;
}

.software-panel {
  position: relative;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow);
}

.window-bar {
  display: flex;
  gap: 7px;
  margin-bottom: 18px;
}

.window-bar span {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: #e85d58;
}

.window-bar span:nth-child(2) {
  background: #f2b84b;
}

.window-bar span:nth-child(3) {
  background: #42b883;
}

.info-table {
  border: 1px solid var(--line);
  border-radius: 7px;
  overflow: hidden;
}

.info-row {
  display: grid;
  grid-template-columns: 112px 1fr;
  border-bottom: 1px solid var(--line);
}

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

.info-row strong,
.info-row span {
  padding: 11px 12px;
}

.info-row strong {
  background: #f0f4fb;
  color: #516079;
}

.chip-strip {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.chip-strip span {
  border-radius: 5px;
  padding: 8px 6px;
  text-align: center;
  color: #fff;
  font-size: 13px;
  font-weight: 800;
  background: #1f6feb;
}

.chip-strip span:nth-child(2) {
  background: #16a085;
}

.chip-strip span:nth-child(3) {
  background: #d97706;
}

.chip-strip span:nth-child(4) {
  background: #536273;
}

.section {
  max-width: 1180px;
  margin: 0 auto;
  padding: 58px 22px;
}

.section-tight {
  padding-top: 36px;
}

.section-head {
  max-width: 780px;
  margin-bottom: 24px;
}

.section-head h2,
.page-title h1 {
  margin: 0 0 12px;
  font-size: clamp(27px, 3vw, 38px);
}

.section-head p,
.page-title p {
  margin: 0;
  color: var(--muted);
}

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

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  background: var(--panel);
}

.card h3 {
  margin: 0 0 10px;
  font-size: 20px;
}

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

.feature-card,
.scenario {
  min-height: 214px;
}

.flat-icon {
  width: 56px;
  height: 56px;
  margin-bottom: 16px;
  display: block;
}

.flat-icon .tile {
  fill: var(--brand);
  stroke: var(--brand);
  stroke-width: 1.5;
}

.flat-icon .shape {
  fill: none;
  stroke: #fff;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.flat-icon .line {
  fill: none;
  stroke: #fff;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.flat-icon .soft-line {
  fill: none;
  stroke: rgba(255, 255, 255, 0.72);
  stroke-width: 2;
  stroke-linecap: round;
}

.flat-icon-green .tile {
  fill: var(--accent);
  stroke: var(--accent);
}

.flat-icon-green .shape {
  stroke: #fff;
}

.flat-icon-green .line {
  stroke: #fff;
}

.flat-icon-green .soft-line {
  stroke: rgba(255, 255, 255, 0.72);
}

.flat-icon-amber .tile {
  fill: var(--warn);
  stroke: var(--warn);
}

.flat-icon-amber .shape {
  stroke: #fff;
}

.flat-icon-amber .line {
  stroke: #fff;
}

.flat-icon-amber .soft-line {
  stroke: rgba(255, 255, 255, 0.72);
}

.band {
  background: #0f1b2f;
  color: #fff;
}

.band .section-head p,
.band .card p {
  color: #c8d3e4;
}

.band .card {
  border-color: rgba(255, 255, 255, 0.13);
  background: rgba(255, 255, 255, 0.07);
}

.quote {
  min-height: 178px;
}

.quote-user {
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.avatar {
  position: relative;
  width: 48px;
  height: 48px;
  flex: 0 0 48px;
  border-radius: 50%;
  background: linear-gradient(145deg, #d7e6ff, #7fb1ff);
  overflow: hidden;
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.72);
}

.avatar::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 9px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff8ef;
}

.avatar::after {
  content: "";
  position: absolute;
  left: 10px;
  bottom: 6px;
  width: 28px;
  height: 18px;
  border-radius: 18px 18px 8px 8px;
  background: #24558f;
}

.avatar-green {
  background: linear-gradient(145deg, #c9f2e7, #45b89b);
}

.avatar-green::after {
  background: #1f6b5f;
}

.avatar-amber {
  background: linear-gradient(145deg, #ffe6b8, #e69b32);
}

.avatar-amber::after {
  background: #8a571a;
}

.quote-user strong {
  display: block;
  line-height: 1.2;
}

.quote-user span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.quote p {
  color: #344056;
}

.quote cite {
  display: block;
  margin-top: 16px;
  color: var(--brand);
  font-style: normal;
  font-weight: 800;
}

.page-hero {
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #eef5ff, #fff);
}

.page-title {
  max-width: 1180px;
  margin: 0 auto;
  padding: 56px 22px 44px;
}

.download-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 24px;
  align-items: stretch;
}

.download-main {
  padding: 28px;
}

.meta-list {
  margin: 20px 0 24px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  list-style: none;
}

.meta-list li {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 12px;
  background: #fbfcff;
}

.notice {
  border-left: 4px solid var(--warn);
  padding: 14px 16px;
  background: #fff7ed;
  color: #7c4a03;
}

.steps {
  counter-reset: step;
  padding: 0;
  list-style: none;
}

.steps li {
  position: relative;
  padding: 18px 18px 18px 64px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.steps li + li {
  margin-top: 12px;
}

.steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 18px;
  top: 18px;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--brand);
  font-weight: 900;
}

.faq-item {
  border-bottom: 1px solid var(--line);
  padding: 20px 0;
}

.faq-item h3 {
  margin: 0 0 8px;
  font-size: 19px;
}

.faq-item p {
  margin: 0;
  color: var(--muted);
}

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

.footer-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 30px 22px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--muted);
  font-size: 14px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: none;
  place-items: center;
  padding: 18px;
  background: rgba(15, 27, 47, 0.58);
}

.modal-backdrop.is-open {
  display: grid;
}

.modal {
  width: min(720px, 100%);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.28);
  overflow: hidden;
}

.modal-head {
  padding: 18px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.modal-head h2 {
  margin: 0;
  font-size: 22px;
}

.modal-close {
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  cursor: pointer;
  font-size: 24px;
  line-height: 1;
}

.modal-body {
  padding: 22px;
}

.qr-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.qr-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  text-align: center;
}

.qr,
.qr-img {
  width: 150px;
  height: 150px;
  margin: 0 auto 12px;
}

.qr {
  padding: 9px;
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  grid-template-rows: repeat(7, 1fr);
  gap: 4px;
  background: #fff;
  border: 1px solid #ccd5e3;
}

.qr span {
  background: #172033;
}

.qr-img {
  display: block;
  border: 1px solid #ccd5e3;
  border-radius: 6px;
}

.qr-card h3 {
  margin: 0 0 6px;
}

.qr-card p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 14px;
}

.source-note {
  margin-top: 18px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 900px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding-top: 14px;
    padding-bottom: 14px;
  }

  .nav-links {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .hero-inner,
  .download-panel {
    grid-template-columns: 1fr;
  }

  .hero-points,
  .grid-3,
  .grid-2,
  .meta-list {
    grid-template-columns: 1fr;
  }

  .software-panel {
    order: -1;
  }
}

@media (max-width: 560px) {
  .hero-inner,
  .section,
  .page-title {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero-inner {
    padding-top: 34px;
  }

  .nav {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero-actions .btn,
  .inline-actions .btn {
    width: 100%;
  }

  .info-row {
    grid-template-columns: 92px 1fr;
  }

  .chip-strip,
  .qr-grid {
    grid-template-columns: 1fr;
  }

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