:root {
  --ink: #28201d;
  --muted: #6f625c;
  --paper: #fffaf0;
  --cream: #fff1cf;
  --orange: #f06a3c;
  --yellow: #ffc857;
  --teal: #207f78;
  --line: #dfd3c6;
  --white: #ffffff;
  --shadow: 0 18px 45px rgba(63, 39, 27, 0.12);
}

* {
  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;
}

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(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(223, 211, 198, 0.8);
  background: rgba(255, 250, 240, 0.94);
  backdrop-filter: blur(14px);
}

.nav-shell {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  font-size: 20px;
  font-weight: 800;
}

.brand img {
  width: 44px;
  height: 44px;
  border-radius: 10px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 15px;
  font-weight: 700;
}

.main-nav a:not(.button) {
  position: relative;
  padding: 7px 0;
}

.main-nav a:not(.button)::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 3px;
  border-radius: 3px;
  background: var(--orange);
  content: "";
  opacity: 0;
  transform: scaleX(0.4);
  transition: 180ms ease;
}

.main-nav a:hover::after,
.main-nav a[aria-current="page"]::after {
  opacity: 1;
  transform: scaleX(1);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  color: var(--ink);
  cursor: pointer;
}

.menu-toggle span,
.menu-toggle::before,
.menu-toggle::after {
  display: block;
  width: 20px;
  height: 2px;
  margin: 5px auto;
  background: currentColor;
  content: "";
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--yellow);
  box-shadow: 4px 4px 0 var(--ink);
  color: var(--ink);
  font-weight: 800;
  transition: 160ms ease;
}

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

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

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--teal);
  font-weight: 800;
}

.text-link::after {
  content: "→";
  transition: transform 160ms ease;
}

.text-link:hover::after {
  transform: translateX(4px);
}

.eyebrow {
  display: inline-flex;
  margin: 0 0 14px;
  padding: 5px 10px;
  border: 1px solid var(--ink);
  border-radius: 4px;
  background: var(--white);
  font-size: 13px;
  font-weight: 800;
}

.hero {
  position: relative;
  min-height: 620px;
  overflow: hidden;
  border-bottom: 2px solid var(--ink);
  background: var(--cream);
}

.hero::before {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(40, 32, 29, 0.07) 1px, transparent 1px), linear-gradient(90deg, rgba(40, 32, 29, 0.07) 1px, transparent 1px);
  background-size: 32px 32px;
  content: "";
  mask-image: linear-gradient(to right, black, transparent 78%);
}

.hero-grid {
  position: relative;
  display: grid;
  min-height: 620px;
  grid-template-columns: minmax(0, 1.05fr) minmax(380px, 0.95fr);
  align-items: center;
  gap: 52px;
  padding: 54px 0 48px;
}

.hero-copy {
  position: relative;
  z-index: 2;
}

.hero h1,
.inner-hero h1 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(40px, 5.5vw, 72px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-lead {
  max-width: 620px;
  margin: 24px 0 0;
  color: #51443e;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 22px;
  margin-top: 30px;
}

.app-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.app-facts li {
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.hero-visual {
  position: relative;
  min-height: 500px;
}

.phone-frame {
  position: absolute;
  width: 236px;
  overflow: hidden;
  border: 7px solid var(--ink);
  border-radius: 26px;
  background: var(--ink);
  box-shadow: var(--shadow);
}

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

.phone-main {
  top: 0;
  left: 34px;
  transform: rotate(-3deg);
}

.phone-side {
  right: 4px;
  bottom: -24px;
  width: 212px;
  transform: rotate(5deg);
}

.sound-effect {
  position: absolute;
  top: 30px;
  right: 0;
  padding: 8px 14px;
  border: 3px solid var(--ink);
  background: var(--orange);
  box-shadow: 4px 4px 0 var(--ink);
  color: var(--white);
  font-size: 20px;
  font-weight: 900;
  transform: rotate(6deg);
}

.section {
  padding: 88px 0;
}

.section-cream {
  background: #fff3d6;
}

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

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 30px;
  margin-bottom: 36px;
}

.section h2,
.content-block h2 {
  margin: 0;
  font-size: clamp(28px, 3.8vw, 46px);
  line-height: 1.2;
  letter-spacing: 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 2px solid var(--ink);
  border-left: 2px solid var(--ink);
}

.feature-item {
  min-height: 250px;
  padding: 28px;
  border-right: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  background: var(--white);
}

.feature-item:nth-child(2n) {
  background: #fff5dd;
}

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

.feature-item h3 {
  margin: 28px 0 10px;
  font-size: 22px;
}

.feature-item p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.shots-track {
  display: grid;
  grid-auto-columns: minmax(220px, 286px);
  grid-auto-flow: column;
  gap: 22px;
  overflow-x: auto;
  padding: 8px 8px 28px;
  scroll-snap-type: x mandatory;
  scrollbar-color: var(--orange) var(--cream);
}

.shot {
  margin: 0;
  scroll-snap-align: start;
}

.shot img {
  width: 100%;
  max-width: 354px;
  height: auto;
  border: 5px solid var(--ink);
  border-radius: 18px;
  box-shadow: 8px 8px 0 var(--orange);
}

.shot figcaption {
  padding: 16px 4px 0;
  font-weight: 800;
}

.path-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: start;
}

.path-panel {
  border-top: 2px solid currentColor;
}

.path-row {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.22);
}

.path-row strong {
  color: var(--yellow);
  font-size: 24px;
}

.path-row h3 {
  margin: 0 0 4px;
  font-size: 20px;
}

.path-row p {
  margin: 0;
  color: #d8cfcb;
}

.quote-stack {
  display: grid;
  gap: 18px;
}

.quote {
  margin: 0;
  padding: 24px;
  border: 2px solid var(--white);
  background: #352b27;
}

.quote:nth-child(2) {
  transform: translateX(20px);
}

.quote p {
  margin: 0 0 12px;
  font-size: 16px;
}

.quote cite {
  color: var(--yellow);
  font-style: normal;
  font-weight: 800;
}

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

.faq-card {
  padding: 26px;
  border: 2px solid var(--ink);
  background: var(--white);
}

.faq-card h3 {
  margin: 0 0 12px;
  font-size: 20px;
}

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

.download-band {
  position: relative;
  overflow: hidden;
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  background: var(--yellow);
}

.download-band::after {
  position: absolute;
  right: -60px;
  bottom: -110px;
  width: 260px;
  height: 260px;
  border: 28px solid rgba(240, 106, 60, 0.5);
  border-radius: 50%;
  content: "";
}

.download-inner {
  position: relative;
  z-index: 1;
  display: flex;
  min-height: 260px;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 46px 0;
}

.download-inner h2 {
  max-width: 700px;
}

.download-meta {
  margin-top: 12px;
  color: #56452b;
  font-weight: 700;
}

.inner-hero {
  border-bottom: 2px solid var(--ink);
  background: var(--cream);
}

.inner-hero .container {
  display: grid;
  min-height: 430px;
  grid-template-columns: 1fr 340px;
  align-items: center;
  gap: 54px;
  padding-top: 54px;
  padding-bottom: 54px;
}

.inner-hero p {
  max-width: 680px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 18px;
}

.mini-shot {
  justify-self: center;
  width: 218px;
  max-width: 100%;
  border: 6px solid var(--ink);
  border-radius: 22px;
  box-shadow: 10px 10px 0 var(--orange);
}

.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 270px;
  gap: 64px;
  align-items: start;
}

.article {
  min-width: 0;
}

.content-block {
  padding: 54px 0;
  border-bottom: 1px solid var(--line);
}

.content-block:first-child {
  padding-top: 0;
}

.content-block h3 {
  margin: 28px 0 10px;
  font-size: 22px;
}

.content-block p {
  margin: 12px 0 0;
  color: #504540;
}

.step-list {
  display: grid;
  gap: 0;
  margin-top: 34px;
  border-top: 2px solid var(--ink);
}

.step {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 22px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.step-index {
  display: grid;
  width: 50px;
  height: 50px;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--yellow);
  font-weight: 900;
}

.step h3 {
  margin: 0 0 8px;
}

.step p {
  margin: 0;
}

.check-list {
  display: grid;
  gap: 12px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding: 14px 18px 14px 48px;
  border: 1px solid var(--line);
  background: var(--white);
}

.check-list li::before {
  position: absolute;
  top: 14px;
  left: 16px;
  color: var(--teal);
  content: "✓";
  font-weight: 900;
}

.article-shot {
  width: 300px;
  max-width: 400px;
  margin: 28px auto 0;
  border: 5px solid var(--ink);
  border-radius: 18px;
}

.side-nav {
  position: sticky;
  top: 96px;
  padding: 22px;
  border: 2px solid var(--ink);
  background: var(--white);
}

.side-nav strong {
  display: block;
  margin-bottom: 12px;
}

.side-nav a {
  display: block;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

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

.notice {
  margin-top: 28px;
  padding: 20px;
  border-left: 5px solid var(--orange);
  background: #fff0e7;
  color: #57423a;
}

.faq-list {
  display: grid;
  gap: 14px;
  margin-top: 34px;
}

.faq-item {
  border: 2px solid var(--ink);
  background: var(--white);
}

.faq-question {
  position: relative;
  width: 100%;
  padding: 20px 58px 20px 22px;
  border: 0;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  font-size: 18px;
  font-weight: 800;
  text-align: left;
}

.faq-question::after {
  position: absolute;
  top: 50%;
  right: 22px;
  content: "+";
  font-size: 26px;
  line-height: 1;
  transform: translateY(-50%);
}

.faq-question[aria-expanded="true"]::after {
  content: "−";
}

.faq-answer {
  display: none;
  padding: 0 22px 22px;
  color: #504540;
}

.faq-answer p {
  margin: 0;
}

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

.settings-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 34px;
}

.setting-item {
  padding: 24px;
  border: 1px solid var(--line);
  background: var(--white);
}

.setting-item h3 {
  margin: 0 0 8px;
}

.setting-item p {
  margin: 0;
}

.site-footer {
  padding: 52px 0 28px;
  background: #201a18;
  color: #d8cfcb;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  padding-bottom: 34px;
}

.footer-brand {
  color: var(--white);
}

.footer-brand p {
  max-width: 600px;
  margin: 16px 0 0;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.footer-links a {
  padding: 8px 0;
  color: var(--white);
  font-weight: 700;
}

.disclaimer {
  padding-top: 22px;
  border-top: 1px solid #433936;
  font-size: 13px;
}

.copyright {
  margin-top: 12px;
  color: #a99c96;
  font-size: 13px;
}

@media (max-width: 980px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 20px;
  }

  .phone-frame {
    width: 200px;
  }

  .phone-side {
    width: 180px;
  }

  .faq-preview {
    grid-template-columns: 1fr;
  }

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

  .side-nav {
    position: static;
    order: -1;
  }
}

@media (max-width: 760px) {
  .container {
    width: min(100% - 28px, 1160px);
  }

  .nav-shell {
    min-height: 64px;
  }

  .brand {
    font-size: 18px;
  }

  .brand img {
    width: 40px;
    height: 40px;
  }

  .menu-toggle {
    display: block;
  }

  .main-nav {
    position: fixed;
    top: 64px;
    right: 0;
    left: 0;
    display: none;
    height: calc(100vh - 64px);
    align-items: stretch;
    flex-direction: column;
    gap: 0;
    padding: 26px;
    background: var(--paper);
  }

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

  .main-nav a:not(.button) {
    padding: 18px 4px;
    border-bottom: 1px solid var(--line);
    font-size: 18px;
  }

  .main-nav .button {
    margin-top: 24px;
  }

  .hero,
  .hero-grid {
    min-height: 0;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    padding: 42px 0 28px;
  }

  .hero h1,
  .inner-hero h1 {
    font-size: 42px;
  }

  .hero-lead,
  .inner-hero p {
    font-size: 16px;
  }

  .hero-visual {
    min-height: 390px;
  }

  .phone-main {
    left: calc(50% - 150px);
    width: 180px;
  }

  .phone-side {
    right: calc(50% - 150px);
    width: 164px;
  }

  .sound-effect {
    top: 12px;
    right: 5%;
    font-size: 16px;
  }

  .section {
    padding: 64px 0;
  }

  .section-head {
    align-items: start;
    flex-direction: column;
    margin-bottom: 28px;
  }

  .feature-grid,
  .path-grid,
  .footer-grid,
  .settings-grid {
    grid-template-columns: 1fr;
  }

  .feature-item {
    min-height: 0;
  }

  .quote:nth-child(2) {
    transform: none;
  }

  .download-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .inner-hero .container {
    min-height: 0;
    grid-template-columns: 1fr;
    padding-top: 46px;
    padding-bottom: 50px;
  }

  .mini-shot {
    width: 190px;
  }

  .content-layout {
    gap: 38px;
  }

  .step {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 14px;
  }

  .step-index {
    width: 42px;
    height: 42px;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}