:root {
  --ink: #121826;
  --ink-soft: #20293a;
  --orange: #ff6b35;
  --orange-dark: #d94917;
  --mint: #2ec4b6;
  --paper: #f7f8fa;
  --white: #ffffff;
  --muted: #667085;
  --line: #e3e7ed;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif;
  line-height: 1.75;
  letter-spacing: 0;
}

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

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  min-height: 72px;
  color: var(--white);
  background: rgba(18, 24, 38, .97);
  border-bottom: 1px solid rgba(255, 255, 255, .1);
}

.nav-wrap {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  font-size: 20px;
  font-weight: 800;
}

.brand img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 30px;
}

.site-nav a {
  color: #d6d9e0;
  font-size: 15px;
  font-weight: 600;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--white);
}

.site-nav a[aria-current="page"] {
  box-shadow: inset 0 -2px 0 var(--orange);
}

.download-button,
.text-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border-radius: 6px;
  font-weight: 800;
  transition: transform .2s ease, background .2s ease;
}

.download-button {
  color: var(--white);
  background: var(--orange);
  box-shadow: 0 8px 22px rgba(255, 107, 53, .25);
}

.download-button:hover {
  background: var(--orange-dark);
  transform: translateY(-2px);
}

.download-button.secondary,
.text-link.secondary {
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: none;
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  color: var(--white);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, .25);
  border-radius: 6px;
  font-size: 22px;
  cursor: pointer;
}

.hero {
  color: var(--white);
  background: var(--ink);
  overflow: hidden;
}

.hero-grid {
  min-height: 620px;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr);
  align-items: center;
  gap: 64px;
  padding: 54px 0 62px;
}

.hero-copy {
  max-width: 640px;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 16px;
  color: var(--mint);
  font-size: 14px;
  font-weight: 800;
}

.hero h1 {
  margin: 0;
  font-size: clamp(42px, 6vw, 72px);
  line-height: 1.1;
  letter-spacing: 0;
}

.hero-copy > p {
  max-width: 620px;
  margin: 22px 0 0;
  color: #cbd0da;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  color: #9ba4b4;
  font-size: 14px;
}

.hero-facts strong {
  display: block;
  color: var(--white);
  font-size: 19px;
}

.hero-visual {
  min-height: 510px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.hero-visual img {
  position: relative;
  z-index: 1;
  width: min(300px, 78vw);
  max-width: 400px;
  height: auto;
  margin: auto 0;
  border: 8px solid #2b3446;
  border-radius: 30px;
  box-shadow: 0 30px 70px rgba(0, 0, 0, .45);
}

.section {
  padding: 86px 0;
}

.section.alt {
  background: var(--paper);
}

.section-dark {
  color: var(--white);
  background: var(--ink-soft);
}

.section-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 36px;
}

.section h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.2;
}

.section-kicker {
  color: var(--orange-dark);
  font-size: 13px;
  font-weight: 800;
}

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

.feature-card,
.path-card,
.quote,
.step,
.info-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.feature-card {
  padding: 26px;
}

.feature-number {
  color: var(--orange);
  font-size: 14px;
  font-weight: 900;
}

.feature-card h3,
.path-card h3,
.step h2,
.info-panel h2 {
  margin: 14px 0 8px;
  font-size: 21px;
  line-height: 1.35;
}

.feature-card p,
.path-card p,
.step p,
.info-panel p {
  margin: 0;
  color: var(--muted);
}

.screen-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 22px;
}

.screen-item {
  margin: 0;
}

.screen-item img {
  width: 100%;
  max-width: 300px;
  height: auto;
  margin: 0 auto;
  border: 1px solid #313a4c;
  border-radius: 8px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, .25);
}

.screen-item figcaption {
  margin-top: 12px;
  color: #bac1cd;
  text-align: center;
  font-size: 14px;
}

.path-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.path-card {
  position: relative;
  min-height: 240px;
  padding: 34px;
  overflow: hidden;
}

.path-card::after {
  content: "→";
  position: absolute;
  right: 28px;
  bottom: 20px;
  color: var(--orange);
  font-size: 32px;
}

.path-card:hover {
  border-color: var(--orange);
}

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

.quote {
  margin: 0;
  padding: 28px;
}

.quote p {
  margin: 0 0 18px;
  font-size: 16px;
}

.quote footer {
  color: var(--muted);
  font-size: 14px;
}

.cta-band {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 30px;
  padding: 40px;
  color: var(--white);
  background: var(--ink);
  border-left: 5px solid var(--mint);
}

.cta-band h2 {
  font-size: 30px;
}

.cta-band .cta-copy {
  margin: 8px 0 0;
  color: #bfc5d0;
}

.page-hero {
  padding: 76px 0 70px;
  color: var(--white);
  background: var(--ink);
}

.page-hero .container {
  max-width: 900px;
}

.page-hero h1 {
  margin: 0 0 18px;
  font-size: clamp(38px, 6vw, 60px);
  line-height: 1.15;
}

.page-hero p {
  max-width: 780px;
  margin: 0;
  color: #c7ccd6;
  font-size: 18px;
}

.content-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  align-items: start;
  gap: 40px;
}

.steps {
  display: grid;
  gap: 22px;
}

.step {
  padding: 30px;
}

.step-label {
  color: var(--orange-dark);
  font-size: 13px;
  font-weight: 900;
}

.step ul,
.info-panel ul {
  margin: 16px 0 0;
  padding-left: 20px;
  color: var(--muted);
}

.step li + li,
.info-panel li + li {
  margin-top: 8px;
}

.side-panel {
  position: sticky;
  top: 96px;
  padding: 26px;
  color: var(--white);
  background: var(--ink-soft);
  border-radius: 8px;
}

.side-panel h2 {
  margin: 0 0 16px;
  font-size: 22px;
}

.side-panel ol {
  margin: 0 0 24px;
  padding-left: 20px;
  color: #cdd2dc;
}

.side-panel li + li {
  margin-top: 8px;
}

.side-panel .download-button {
  width: 100%;
}

.notice {
  margin: 22px 0 0;
  padding: 20px;
  background: #fff7f2;
  border-left: 4px solid var(--orange);
}

.notice strong {
  display: block;
  margin-bottom: 4px;
}

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

.faq-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.faq-question {
  width: 100%;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 20px;
  color: var(--ink);
  background: transparent;
  border: 0;
  text-align: left;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.faq-question span:last-child {
  flex: 0 0 auto;
  color: var(--orange-dark);
  font-size: 24px;
}

.faq-answer {
  display: none;
  padding: 0 20px 20px;
  color: var(--muted);
}

.faq-item.open .faq-answer {
  display: block;
}

.faq-item.open .faq-question span:last-child {
  transform: rotate(45deg);
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 50px;
}

.info-panel {
  padding: 28px;
}

.site-footer {
  padding: 54px 0 28px;
  color: #b8c0ce;
  background: #0c111c;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr .7fr .8fr;
  gap: 44px;
}

.footer-grid h2 {
  margin: 0 0 12px;
  color: var(--white);
  font-size: 18px;
}

.footer-grid p,
.footer-grid ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-grid li + li {
  margin-top: 8px;
}

.footer-grid a:hover {
  color: var(--white);
}

.disclaimer {
  margin: 38px 0 0;
  padding-top: 22px;
  border-top: 1px solid #283041;
  color: #8f98a7;
  font-size: 13px;
}

@media (max-width: 960px) {
  .site-nav {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    display: none;
    align-items: stretch;
    flex-direction: column;
    gap: 0;
    padding: 12px 20px 20px;
    background: var(--ink);
    border-top: 1px solid rgba(255, 255, 255, .1);
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav a {
    padding: 13px 0;
  }

  .site-nav .download-button {
    margin-top: 8px;
  }

  .menu-toggle {
    display: inline-grid;
    place-items: center;
  }

  .hero-grid {
    grid-template-columns: 1fr 320px;
    gap: 28px;
  }

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

  .content-shell {
    grid-template-columns: 1fr;
  }

  .side-panel {
    position: static;
  }
}

@media (max-width: 720px) {
  .container {
    width: min(calc(100% - 28px), var(--max-width));
  }

  .hero-grid {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 34px 0 40px;
  }

  .hero h1 {
    font-size: 44px;
  }

  .hero-copy > p {
    font-size: 16px;
  }

  .hero-visual {
    min-height: 270px;
  }

  .hero-visual img {
    width: 162px;
  }

  .hero-facts {
    display: none;
  }

  .section {
    padding: 62px 0;
  }

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

  .feature-grid,
  .screen-strip,
  .path-grid,
  .quote-grid,
  .info-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .screen-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .cta-band {
    grid-template-columns: 1fr;
    padding: 28px;
  }

  .page-hero {
    padding: 58px 0 54px;
  }

  .page-hero p {
    font-size: 16px;
  }
}

@media (max-width: 390px) {
  .brand span {
    font-size: 18px;
  }

  .hero h1 {
    font-size: 38px;
  }

}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
  }
}