:root {
  --ink: #17352e;
  --ink-soft: #45635a;
  --paper: #f8fbf5;
  --white: #ffffff;
  --green: #75d35d;
  --green-dark: #2d7b53;
  --lime: #c9f227;
  --yellow: #ffd95a;
  --coral: #ff6b57;
  --line: #d9e5dc;
  --muted: #edf3ee;
  --shadow: 0 18px 50px rgba(23, 53, 46, 0.12);
  --container: 1160px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  line-height: 1.75;
  letter-spacing: 0;
}

body.menu-open {
  overflow: hidden;
}

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(--container));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: 8px 14px;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(23, 53, 46, 0.1);
  background: rgba(248, 251, 245, 0.94);
  backdrop-filter: blur(14px);
}

.nav-wrap {
  min-height: 72px;
  display: flex;
  align-items: center;
  gap: 34px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  font-size: 21px;
  font-weight: 900;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 8px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: auto;
}

.site-nav a:not(.button) {
  position: relative;
  font-size: 15px;
  font-weight: 700;
}

.site-nav a:not(.button)::after {
  position: absolute;
  right: 0;
  bottom: -7px;
  left: 0;
  height: 3px;
  background: var(--coral);
  content: "";
  transform: scaleX(0);
  transition: transform 180ms ease;
}

.site-nav a[aria-current="page"]::after,
.site-nav a:not(.button):hover::after {
  transform: scaleX(1);
}

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 10px 20px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--lime);
  box-shadow: 4px 4px 0 var(--ink);
  font-weight: 900;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.button:hover,
.button:focus-visible {
  box-shadow: 2px 2px 0 var(--ink);
  transform: translate(2px, 2px);
}

.button-dark {
  color: var(--white);
  background: var(--ink);
  box-shadow: 4px 4px 0 var(--coral);
}

.button-dark:hover,
.button-dark:focus-visible {
  box-shadow: 2px 2px 0 var(--coral);
}

.button-icon {
  font-size: 20px;
  line-height: 1;
}

.menu-button {
  width: 44px;
  height: 44px;
  display: none;
  align-items: center;
  justify-content: center;
  margin-left: auto;
  border: 2px solid var(--ink);
  border-radius: 6px;
  color: var(--ink);
  background: var(--white);
  font-size: 25px;
  cursor: pointer;
}

.hero {
  position: relative;
  min-height: 650px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: var(--white);
}

.hero::before {
  position: absolute;
  top: 0;
  right: 0;
  width: 43%;
  height: 100%;
  background: var(--green);
  content: "";
}

.hero-grid {
  position: relative;
  min-height: 650px;
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  align-items: center;
  gap: 60px;
  padding-block: 66px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  padding: 5px 10px;
  border: 1px solid var(--ink);
  border-radius: 4px;
  background: var(--yellow);
  font-size: 13px;
  font-weight: 900;
}

.eyebrow::before {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--coral);
  content: "";
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.2;
  letter-spacing: 0;
}

h1 {
  max-width: 680px;
  margin-bottom: 24px;
  font-size: clamp(44px, 6vw, 78px);
  font-weight: 950;
}

h2 {
  margin-bottom: 30px;
  font-size: clamp(30px, 4vw, 48px);
  font-weight: 950;
}

h3 {
  margin-bottom: 12px;
  font-size: 21px;
  font-weight: 900;
}

.hero-lead {
  max-width: 600px;
  margin: 0 0 28px;
  color: var(--ink-soft);
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
}

.platform-note {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 700;
}

.platform-note::before {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--green-dark);
  content: "";
}

.hero-visual {
  position: relative;
  min-height: 500px;
  display: grid;
  place-items: center;
}

.phone-frame {
  position: relative;
  width: min(318px, 78vw);
  padding: 12px;
  border: 4px solid var(--ink);
  border-radius: 30px;
  background: var(--ink);
  box-shadow: 18px 20px 0 var(--yellow), var(--shadow);
  transform: rotate(2deg);
}

.phone-frame::before {
  position: absolute;
  top: 8px;
  left: 50%;
  z-index: 2;
  width: 70px;
  height: 7px;
  border-radius: 5px;
  background: var(--ink);
  content: "";
  transform: translateX(-50%);
}

.phone-frame img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: 18px;
}

.visual-note {
  position: absolute;
  right: 4%;
  bottom: 36px;
  width: 174px;
  padding: 14px 16px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--coral);
  box-shadow: 5px 5px 0 var(--ink);
  color: var(--white);
  font-size: 14px;
  font-weight: 900;
  transform: rotate(-4deg);
}

.quick-strip {
  position: relative;
  z-index: 3;
  margin-top: -1px;
  border-bottom: 1px solid var(--line);
  background: var(--ink);
  color: var(--white);
}

.quick-grid {
  min-height: 112px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.quick-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 24px;
  border-right: 1px solid rgba(255, 255, 255, 0.17);
}

.quick-item:last-child {
  border-right: 0;
}

.quick-number {
  color: var(--lime);
  font-size: 28px;
  font-weight: 950;
}

.quick-label {
  font-size: 14px;
}

.section {
  padding-block: 100px;
}

.section-white {
  background: var(--white);
}

.section-green {
  background: #e5f7df;
}

.section-yellow {
  background: var(--yellow);
}

.section-head {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  align-items: end;
  gap: 80px;
  margin-bottom: 42px;
}

.section-head h2 {
  margin-bottom: 0;
}

.section-copy {
  margin: 0;
  color: var(--ink-soft);
}

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

.feature-card {
  min-height: 260px;
  padding: 28px;
  border: 1px solid var(--line);
  border-top: 6px solid var(--green-dark);
  border-radius: 6px;
  background: var(--white);
}

.feature-card:nth-child(2) {
  border-top-color: var(--coral);
}

.feature-card:nth-child(3) {
  border-top-color: var(--yellow);
}

.feature-card:nth-child(4) {
  border-top-color: var(--lime);
}

.feature-card:nth-child(5) {
  border-top-color: var(--green);
}

.feature-card:nth-child(6) {
  border-top-color: var(--ink);
}

.feature-icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  margin-bottom: 24px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--lime);
  font-size: 23px;
  font-weight: 900;
}

.feature-card p {
  margin: 0;
  color: var(--ink-soft);
}

.showcase-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  align-items: center;
  gap: 72px;
}

.shot-stack {
  position: relative;
  min-height: 600px;
}

.app-shot {
  position: absolute;
  width: min(285px, 72vw);
  max-width: 400px;
  height: auto;
  border: 3px solid var(--ink);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.shot-one {
  top: 0;
  left: 0;
  transform: rotate(-3deg);
}

.shot-two {
  right: 0;
  bottom: 0;
  transform: rotate(4deg);
}

.chapter-list {
  display: grid;
  gap: 0;
  border-top: 2px solid var(--ink);
}

.chapter-row {
  display: grid;
  grid-template-columns: 54px 1fr auto;
  align-items: center;
  gap: 16px;
  padding-block: 19px;
  border-bottom: 1px solid var(--line);
}

.chapter-index {
  color: var(--coral);
  font-weight: 950;
}

.chapter-row strong {
  font-size: 17px;
}

.chapter-row span:last-child {
  color: var(--ink-soft);
  font-size: 13px;
}

.deep-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 18px;
}

.deep-link {
  min-height: 330px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 34px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--lime);
  box-shadow: 8px 8px 0 var(--ink);
}

.deep-link:nth-child(2) {
  color: var(--white);
  background: var(--green-dark);
}

.deep-link p {
  max-width: 540px;
  margin: 0;
}

.deep-arrow {
  align-self: flex-end;
  font-size: 36px;
  font-weight: 900;
}

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

.quote {
  margin: 0;
  padding: 26px;
  border-left: 4px solid var(--coral);
  background: var(--white);
}

.quote p {
  margin: 0 0 20px;
  font-size: 17px;
}

.quote cite {
  color: var(--ink-soft);
  font-size: 13px;
  font-style: normal;
  font-weight: 700;
}

.faq-list {
  border-top: 2px solid var(--ink);
}

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

.faq-question {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 36px;
  align-items: center;
  gap: 20px;
  padding: 22px 0;
  border: 0;
  color: var(--ink);
  background: transparent;
  text-align: left;
  font: inherit;
  font-size: 17px;
  font-weight: 900;
  cursor: pointer;
}

.faq-question span:last-child {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 1px solid var(--ink);
  border-radius: 50%;
  transition: transform 180ms ease;
}

.faq-question[aria-expanded="true"] span:last-child {
  transform: rotate(45deg);
}

.faq-answer {
  max-width: 850px;
  padding: 0 56px 22px 0;
  color: var(--ink-soft);
}

.faq-answer p {
  margin: 0;
}

.download-band {
  padding-block: 72px;
  background: var(--ink);
  color: var(--white);
}

.download-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.download-inner h2 {
  max-width: 720px;
  margin: 0;
}

.download-inner p {
  margin: 12px 0 0;
  color: #c8d7d1;
}

.page-hero {
  position: relative;
  overflow: hidden;
  padding-block: 86px 78px;
  border-bottom: 1px solid var(--line);
  background: var(--white);
}

.page-hero::after {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 34%;
  height: 16px;
  background: var(--coral);
  content: "";
}

.page-hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 60px;
}

.page-hero h1 {
  font-size: clamp(42px, 6vw, 68px);
}

.page-summary {
  max-width: 700px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 18px;
}

.page-hero-panel {
  padding: 32px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--yellow);
  box-shadow: 8px 8px 0 var(--ink);
}

.page-hero-panel strong {
  display: block;
  margin-bottom: 12px;
  font-size: 22px;
}

.page-hero-panel ul {
  margin: 0;
  padding-left: 20px;
}

.steps {
  counter-reset: guide-step;
}

.step {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 34px;
  padding-block: 38px;
  border-top: 1px solid var(--line);
  counter-increment: guide-step;
}

.step:last-child {
  border-bottom: 1px solid var(--line);
}

.step-number::before {
  width: 70px;
  height: 70px;
  display: grid;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 4px 4px 0 var(--ink);
  content: counter(guide-step, decimal-leading-zero);
  font-size: 22px;
  font-weight: 950;
}

.step-content p {
  margin: 0 0 12px;
  color: var(--ink-soft);
}

.step-content p:last-child {
  margin-bottom: 0;
}

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

.check-item {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 14px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.check-mark {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--white);
  background: var(--green-dark);
  font-weight: 900;
}

.check-item p {
  margin: 5px 0 0;
  color: var(--ink-soft);
}

.guide-shot {
  width: min(340px, 100%);
  max-width: 400px;
  margin: 34px auto 0;
  border: 3px solid var(--ink);
  border-radius: 8px;
  box-shadow: 12px 12px 0 var(--green);
}

.manual-layout {
  display: grid;
  grid-template-columns: 270px 1fr;
  align-items: start;
  gap: 70px;
}

.manual-nav {
  position: sticky;
  top: 104px;
  display: grid;
  border-top: 2px solid var(--ink);
}

.manual-nav a {
  padding: 14px 4px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  font-weight: 800;
}

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

.manual-section {
  padding-bottom: 64px;
  scroll-margin-top: 100px;
}

.manual-section + .manual-section {
  padding-top: 64px;
  border-top: 1px solid var(--line);
}

.manual-section h2 {
  font-size: clamp(28px, 4vw, 42px);
}

.manual-section p {
  margin: 0 0 16px;
  color: var(--ink-soft);
}

.mode-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.mode-item {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.mode-item strong {
  display: block;
  margin-bottom: 8px;
}

.site-footer {
  padding-block: 58px 30px;
  border-top: 1px solid var(--line);
  background: #eaf1eb;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 1fr;
  gap: 60px;
  padding-bottom: 40px;
}

.footer-title {
  margin: 0 0 13px;
  font-size: 15px;
  font-weight: 900;
}

.footer-copy,
.disclaimer {
  margin: 0;
  color: var(--ink-soft);
  font-size: 13px;
}

.footer-links {
  display: grid;
  gap: 8px;
  font-size: 14px;
  font-weight: 700;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 12px;
}

@media (max-width: 940px) {
  .menu-button {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    inset: 73px 0 auto;
    display: none;
    align-items: stretch;
    padding: 24px 20px 32px;
    border-bottom: 2px solid var(--ink);
    background: var(--paper);
  }

  .site-nav.is-open {
    display: grid;
  }

  .site-nav .button {
    width: 100%;
  }

  .hero::before {
    top: auto;
    width: 100%;
    height: 44%;
  }

  .hero-grid,
  .page-hero-grid,
  .showcase-grid {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    padding-top: 56px;
  }

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

  .quick-item:nth-child(2) {
    border-right: 0;
  }

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

  .section-head {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .manual-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .manual-nav {
    position: static;
    grid-template-columns: repeat(3, 1fr);
  }

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

@media (max-width: 660px) {
  .container {
    width: min(calc(100% - 28px), var(--container));
  }

  h1 {
    font-size: 44px;
  }

  h2 {
    font-size: 32px;
  }

  .section {
    padding-block: 72px;
  }

  .hero,
  .hero-grid {
    min-height: auto;
  }

  .hero-actions,
  .download-inner {
    align-items: stretch;
    flex-direction: column;
  }

  .hero-actions .button,
  .download-inner .button {
    width: 100%;
  }

  .hero-visual {
    min-height: 520px;
  }

  .visual-note {
    right: 0;
  }

  .quick-grid,
  .feature-grid,
  .quote-grid,
  .deep-grid,
  .checklist,
  .mode-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .quick-item {
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.17);
  }

  .deep-link {
    min-height: 270px;
  }

  .shot-stack {
    min-height: 720px;
  }

  .app-shot {
    width: min(270px, 78vw);
  }

  .shot-one {
    left: 10px;
  }

  .shot-two {
    right: 10px;
  }

  .step {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .manual-nav {
    grid-template-columns: 1fr 1fr;
  }

  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
  }
}

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

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