:root {
  --ink: #151825;
  --ink-soft: #24283a;
  --paper: #f6f7fb;
  --white: #ffffff;
  --coral: #ff6b4a;
  --coral-dark: #d94a2c;
  --mint: #63d7c5;
  --gold: #f4c95d;
  --line: #dfe2eb;
  --muted: #606678;
  --shadow: 0 18px 50px rgba(21, 24, 37, 0.12);
  --radius: 8px;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0;
}

body.menu-open {
  overflow: hidden;
}

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

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

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

button,
input {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  padding: 9px 14px;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-180%);
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(246, 247, 251, 0.96);
  border-bottom: 1px solid rgba(21, 24, 37, 0.1);
  backdrop-filter: blur(14px);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  font-size: 21px;
  font-weight: 800;
}

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

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-nav > a:not(.button) {
  padding: 8px 13px;
  color: #3f4557;
  font-size: 15px;
  font-weight: 650;
}

.site-nav > a:not(.button):hover,
.site-nav > a[aria-current="page"]:not(.button) {
  color: var(--coral-dark);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  color: var(--white);
  background: var(--ink);
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  font-size: 24px;
  line-height: 1;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 10px 20px;
  color: var(--white);
  background: var(--coral);
  border: 2px solid var(--coral);
  border-radius: 6px;
  font-weight: 800;
  box-shadow: 5px 5px 0 var(--ink);
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover {
  background: var(--coral-dark);
  border-color: var(--coral-dark);
  box-shadow: 2px 2px 0 var(--ink);
  transform: translate(3px, 3px);
}

.button:focus-visible,
.site-nav a:focus-visible,
.text-link:focus-visible,
.faq-item summary:focus-visible {
  outline: 3px solid var(--mint);
  outline-offset: 3px;
}

.button-secondary {
  color: var(--ink);
  background: var(--mint);
  border-color: var(--mint);
}

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

.hero::before {
  position: absolute;
  top: 9%;
  right: -5%;
  width: 43%;
  height: 74%;
  background: var(--gold);
  content: "";
  transform: skewY(-4deg);
}

.hero-grid {
  position: relative;
  display: grid;
  min-height: 670px;
  grid-template-columns: 1.03fr 0.97fr;
  align-items: center;
  gap: 70px;
  padding: 64px 0 72px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  color: var(--coral-dark);
  font-size: 14px;
  font-weight: 850;
}

.eyebrow::before {
  width: 32px;
  height: 4px;
  background: var(--coral);
  content: "";
}

.hero h1,
.inner-hero h1 {
  max-width: 760px;
  margin: 0;
  line-height: 1.08;
  letter-spacing: 0;
}

.hero h1 {
  font-size: clamp(42px, 6vw, 76px);
}

.hero-copy > p:not(.eyebrow) {
  max-width: 620px;
  margin: 24px 0 0;
  color: #464c5c;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.hero-proof {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.hero-proof li::before {
  color: var(--coral);
  content: "●";
  margin-right: 8px;
}

.hero-visual {
  position: relative;
  display: flex;
  min-height: 540px;
  align-items: center;
  justify-content: center;
}

.hero-visual img {
  width: min(358px, 78vw);
  max-width: 400px;
  height: auto;
  margin: auto 0;
  border: 8px solid var(--ink);
  border-radius: 30px;
  box-shadow: 18px 22px 0 var(--mint), var(--shadow);
}

.hero-note {
  position: absolute;
  right: 0;
  bottom: 9%;
  max-width: 190px;
  padding: 14px 16px;
  color: var(--white);
  background: var(--ink);
  border-left: 6px solid var(--coral);
  font-size: 13px;
  font-weight: 750;
}

.signal-strip {
  color: var(--white);
  background: var(--ink);
}

.signal-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0 auto;
  padding: 20px 0;
  list-style: none;
}

.signal-list li {
  padding: 0 20px;
  border-right: 1px solid rgba(255, 255, 255, 0.18);
  text-align: center;
}

.signal-list li:last-child {
  border-right: 0;
}

.signal-list strong,
.signal-list span {
  display: block;
}

.signal-list strong {
  color: var(--mint);
  font-size: 17px;
}

.signal-list span {
  margin-top: 2px;
  color: #c9cedc;
  font-size: 13px;
}

.section {
  padding: 88px 0;
}

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

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

.section-accent {
  background: #e7faf6;
  border-top: 1px solid #bce9df;
  border-bottom: 1px solid #bce9df;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 30px;
  margin-bottom: 38px;
}

.section-head h2 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.18;
}

.section-kicker {
  color: var(--coral-dark);
  font-size: 13px;
  font-weight: 850;
  text-transform: uppercase;
}

.section-dark .section-kicker {
  color: var(--gold);
}

.text-link {
  flex: 0 0 auto;
  color: var(--coral-dark);
  border-bottom: 2px solid currentColor;
  font-weight: 800;
}

.section-dark .text-link {
  color: var(--mint);
}

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

.feature-card {
  min-height: 250px;
  padding: 28px;
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 5px solid var(--coral);
  border-radius: var(--radius);
}

.feature-card:nth-child(2),
.feature-card:nth-child(5) {
  border-top-color: var(--mint);
}

.feature-card:nth-child(3),
.feature-card:nth-child(6) {
  border-top-color: var(--gold);
}

.feature-number {
  color: var(--coral-dark);
  font: 800 13px Consolas, Monaco, monospace;
}

.feature-card h3 {
  margin: 18px 0 10px;
  font-size: 22px;
}

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

.screenshot-stage {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  align-items: center;
  gap: 52px;
}

.screen-stack {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: center;
  gap: 18px;
}

.screen-stack figure,
.screen-row figure,
.guide-shot {
  margin: 0;
}

.screen-stack figure:nth-child(2) {
  margin-top: 62px;
}

.screen-stack img,
.screen-row img,
.guide-shot img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border: 5px solid var(--ink-soft);
  border-radius: 22px;
}

.screen-stack figcaption,
.screen-row figcaption,
.guide-shot figcaption {
  margin-top: 10px;
  color: #b8bece;
  font-size: 13px;
}

.screen-copy h3 {
  margin: 0 0 18px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.2;
}

.screen-copy ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.screen-copy li {
  padding: 16px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
}

.screen-copy strong {
  display: block;
  margin-bottom: 3px;
  color: var(--mint);
}

.rhythm {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}

.rhythm::before {
  position: absolute;
  top: 30px;
  right: 10%;
  left: 10%;
  height: 3px;
  background: var(--ink);
  content: "";
}

.rhythm-item {
  position: relative;
  padding: 0 20px;
  text-align: center;
}

.rhythm-dot {
  position: relative;
  z-index: 1;
  display: grid;
  width: 62px;
  height: 62px;
  margin: 0 auto 18px;
  place-items: center;
  color: var(--white);
  background: var(--ink);
  border: 6px solid var(--paper);
  border-radius: 50%;
  font-weight: 850;
}

.rhythm-item:nth-child(2) .rhythm-dot {
  background: var(--coral);
}

.rhythm-item:nth-child(3) .rhythm-dot {
  color: var(--ink);
  background: var(--mint);
}

.rhythm-item:nth-child(4) .rhythm-dot {
  color: var(--ink);
  background: var(--gold);
}

.rhythm-item h3 {
  margin: 0 0 7px;
  font-size: 18px;
}

.rhythm-item p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.deep-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.deep-card {
  display: grid;
  min-height: 245px;
  padding: 34px;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 20px;
  background: var(--white);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: 8px 8px 0 var(--ink);
}

.deep-card:first-child {
  background: #fff1ed;
}

.deep-card:last-child {
  background: #e7faf6;
}

.deep-card h3 {
  margin: 0 0 10px;
  font-size: 27px;
}

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

.deep-arrow {
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  color: var(--white);
  background: var(--ink);
  border-radius: 50%;
  font-size: 24px;
}

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

.review-card {
  margin: 0;
  padding: 26px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.review-card blockquote {
  margin: 0 0 20px;
  font-size: 17px;
  font-weight: 650;
}

.review-card figcaption {
  color: var(--muted);
  font-size: 13px;
}

.mini-faq {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.mini-faq article {
  padding: 24px;
  background: var(--white);
  border-left: 5px solid var(--coral);
}

.mini-faq h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

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

.download-band {
  color: var(--white);
  background: var(--coral);
}

.download-band-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 32px;
  padding: 52px 0;
}

.download-band h2 {
  margin: 0;
  font-size: clamp(29px, 4vw, 46px);
  line-height: 1.2;
}

.download-band .button {
  color: var(--ink);
  background: var(--white);
  border-color: var(--white);
}

.site-footer {
  color: #c7cbda;
  background: #0f111a;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr 1fr;
  gap: 50px;
  padding: 56px 0 34px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--white);
  font-size: 22px;
  font-weight: 850;
}

.footer-brand img {
  width: 44px;
  height: 44px;
  border-radius: 8px;
}

.footer-grid h2 {
  margin: 0 0 14px;
  color: var(--white);
  font-size: 16px;
}

.footer-grid p {
  margin: 15px 0 0;
  font-size: 14px;
}

.footer-links {
  display: grid;
  gap: 8px;
}

.footer-links a:hover {
  color: var(--mint);
}

.disclaimer {
  margin: 0 auto;
  padding: 18px 0 26px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 13px;
  text-align: center;
}

.copyright {
  margin: 0 auto;
  padding: 0 0 14px;
  color: #9299ad;
  font-size: 13px;
  text-align: center;
}

.inner-hero {
  color: var(--white);
  background: var(--ink);
  border-bottom: 9px solid var(--coral);
}

.inner-hero-grid {
  display: grid;
  min-height: 420px;
  grid-template-columns: 1fr 0.52fr;
  align-items: center;
  gap: 60px;
  padding: 72px 0;
}

.inner-hero h1 {
  font-size: clamp(38px, 5vw, 62px);
}

.inner-hero-copy > p:not(.eyebrow) {
  max-width: 720px;
  margin: 22px 0 0;
  color: #cbd0dd;
  font-size: 17px;
}

.inner-hero-mark {
  display: grid;
  aspect-ratio: 1;
  place-items: center;
  color: var(--ink);
  background: var(--mint);
  border: 8px solid var(--white);
  border-radius: 50%;
  box-shadow: 16px 16px 0 var(--coral);
  font-size: clamp(72px, 10vw, 132px);
  font-weight: 900;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 18px;
  color: #9ba2b6;
  font-size: 13px;
}

.breadcrumb a {
  color: var(--mint);
}

.guide-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  align-items: start;
  gap: 52px;
}

.guide-aside {
  position: sticky;
  top: 100px;
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 5px solid var(--mint);
}

.guide-aside h2 {
  margin: 0 0 14px;
  font-size: 18px;
}

.guide-aside ol {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
  font-size: 14px;
}

.guide-aside a:hover {
  color: var(--coral-dark);
}

.guide-steps {
  position: relative;
}

.guide-steps::before {
  position: absolute;
  top: 24px;
  bottom: 30px;
  left: 27px;
  width: 4px;
  background: var(--line);
  content: "";
}

.guide-step {
  position: relative;
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 24px;
  padding-bottom: 52px;
}

.step-number {
  position: relative;
  z-index: 1;
  display: grid;
  width: 58px;
  height: 58px;
  place-items: center;
  color: var(--white);
  background: var(--coral);
  border: 6px solid var(--paper);
  border-radius: 50%;
  font: 800 17px Consolas, Monaco, monospace;
}

.step-body {
  padding: 28px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.step-body h2 {
  margin: 0 0 13px;
  font-size: 27px;
}

.step-body h3 {
  margin: 25px 0 8px;
  font-size: 19px;
}

.step-body p,
.step-body ul {
  color: #505667;
}

.step-body p {
  margin: 0 0 14px;
}

.step-body ul {
  margin: 0;
  padding-left: 21px;
}

.guide-shot {
  display: grid;
  max-width: 400px;
  margin-top: 22px;
}

.guide-shot figcaption {
  color: var(--muted);
}

.notice-box {
  margin-top: 24px;
  padding: 20px 22px;
  background: #fff5d8;
  border-left: 5px solid var(--gold);
}

.notice-box strong {
  display: block;
  margin-bottom: 5px;
}

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

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

.check-item h3 {
  margin: 0 0 7px;
  font-size: 18px;
}

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

.faq-tools {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  margin-bottom: 30px;
}

.faq-search {
  width: 100%;
  min-height: 50px;
  padding: 12px 16px;
  color: var(--ink);
  background: var(--white);
  border: 2px solid var(--ink);
  border-radius: 4px;
}

.faq-count {
  display: inline-flex;
  align-items: center;
  padding: 0 18px;
  color: var(--white);
  background: var(--ink);
  border-radius: 4px;
  font-weight: 800;
}

.faq-layout {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  align-items: start;
  gap: 44px;
}

.function-panel {
  display: grid;
  gap: 16px;
}

.function-block {
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 5px solid var(--mint);
}

.function-block:nth-child(even) {
  border-left-color: var(--coral);
}

.function-block h2 {
  margin: 0 0 9px;
  font-size: 22px;
}

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

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

.faq-item {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 5px;
}

.faq-item[hidden] {
  display: none;
}

.faq-item summary {
  position: relative;
  padding: 20px 54px 20px 22px;
  cursor: pointer;
  list-style: none;
  font-size: 17px;
  font-weight: 800;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  position: absolute;
  top: 50%;
  right: 22px;
  color: var(--coral-dark);
  content: "+";
  font-size: 27px;
  transform: translateY(-50%);
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-answer {
  padding: 0 22px 22px;
  color: var(--muted);
}

.faq-answer p {
  margin: 0;
}

.screen-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  align-items: start;
  gap: 22px;
}

.screen-row figure:nth-child(2) {
  margin-top: 40px;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 520ms ease, transform 520ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

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

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .button {
    transition: none;
  }
}

@media (max-width: 960px) {
  .site-header {
    backdrop-filter: none;
  }

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

  .site-nav {
    position: fixed;
    top: 72px;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 60;
    display: none;
    align-content: start;
    align-items: stretch;
    padding: 26px 20px;
    overflow-y: auto;
    background: var(--paper);
  }

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

  .site-nav > a:not(.button) {
    padding: 14px 4px;
    border-bottom: 1px solid var(--line);
    font-size: 18px;
  }

  .site-nav .button {
    margin-top: 14px;
  }

  .hero-grid,
  .inner-hero-grid,
  .screenshot-stage,
  .guide-layout,
  .faq-layout {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    gap: 20px;
    padding-top: 54px;
  }

  .hero-visual {
    min-height: 510px;
  }

  .hero::before {
    top: auto;
    right: -10%;
    bottom: 2%;
    width: 75%;
    height: 42%;
  }

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

  .guide-aside {
    position: static;
  }

  .inner-hero-grid {
    gap: 38px;
  }

  .inner-hero-mark {
    width: min(260px, 70vw);
  }

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

@media (max-width: 680px) {
  .container {
    width: min(100% - 28px, var(--container));
  }

  .section {
    padding: 66px 0;
  }

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

  .hero h1 {
    font-size: 43px;
  }

  .hero-copy > p:not(.eyebrow) {
    font-size: 16px;
  }

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

  .hero-visual {
    min-height: 470px;
  }

  .hero-note {
    right: 2px;
    bottom: 2%;
  }

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

  .signal-list li:nth-child(2) {
    border-right: 0;
  }

  .signal-list li:nth-child(-n+2) {
    margin-bottom: 18px;
  }

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

  .feature-grid,
  .review-grid,
  .deep-links,
  .mini-faq,
  .check-grid,
  .footer-grid,
  .screen-row {
    grid-template-columns: 1fr;
  }

  .feature-card {
    min-height: auto;
  }

  .screen-stack {
    gap: 10px;
  }

  .screen-stack figure:nth-child(2) {
    margin-top: 34px;
  }

  .rhythm {
    grid-template-columns: 1fr;
    gap: 26px;
  }

  .rhythm::before {
    top: 25px;
    bottom: 25px;
    left: 30px;
    width: 3px;
    height: auto;
  }

  .rhythm-item {
    display: grid;
    grid-template-columns: 62px 1fr;
    gap: 16px;
    padding: 0;
    text-align: left;
  }

  .rhythm-dot {
    margin: 0;
  }

  .download-band-inner {
    grid-template-columns: 1fr;
  }

  .download-band .button {
    width: 100%;
  }

  .inner-hero-grid {
    min-height: auto;
    padding: 54px 0 62px;
  }

  .inner-hero h1 {
    font-size: 39px;
  }

  .guide-step {
    grid-template-columns: 46px 1fr;
    gap: 12px;
  }

  .guide-steps::before {
    left: 21px;
  }

  .step-number {
    width: 46px;
    height: 46px;
    border-width: 5px;
    font-size: 14px;
  }

  .step-body {
    padding: 21px;
  }

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

  .faq-count {
    min-height: 44px;
    justify-content: center;
  }

  .screen-row figure:nth-child(2) {
    margin-top: 0;
  }
}