:root {
  --ink: #17201f;
  --muted: #63706e;
  --paper: #f8f7f2;
  --white: #ffffff;
  --teal: #0b7f73;
  --teal-dark: #075e57;
  --coral: #f25f5c;
  --yellow: #f6c453;
  --line: #dce3e0;
  --shadow: 0 18px 55px rgba(23, 32, 31, 0.12);
  --max: 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;
  font-size: 16px;
  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;
}

.skip-link {
  position: fixed;
  left: 16px;
  top: -80px;
  z-index: 1000;
  padding: 10px 16px;
  color: var(--white);
  background: var(--ink);
}

.skip-link:focus {
  top: 16px;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(220, 227, 224, 0.85);
  background: rgba(248, 247, 242, 0.94);
  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: 10px;
  font-size: 20px;
  font-weight: 800;
  line-height: 1;
}

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 8px;
}

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

.site-nav a {
  padding: 9px 13px;
  border-radius: 6px;
  color: #33413f;
  font-size: 14px;
  font-weight: 700;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--teal-dark);
  background: #e5f1ee;
}

.nav-download,
.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 20px;
  border: 0;
  border-radius: 6px;
  color: var(--white) !important;
  background: var(--coral) !important;
  box-shadow: 0 10px 24px rgba(242, 95, 92, 0.24);
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.button:hover,
.nav-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(242, 95, 92, 0.32);
}

.button.secondary {
  color: var(--ink) !important;
  background: var(--white) !important;
  box-shadow: none;
  outline: 1px solid var(--line);
}

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

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
  cursor: pointer;
}

.nav-toggle span,
.nav-toggle::before,
.nav-toggle::after {
  display: block;
  width: 20px;
  height: 2px;
  margin: 5px auto;
  background: var(--ink);
  content: "";
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 84px 0 72px;
  color: var(--white);
  background: var(--ink);
}

.hero::before {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 44px 44px;
  content: "";
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.03fr) minmax(340px, 0.97fr);
  align-items: center;
  gap: 70px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 14px;
  color: var(--teal-dark);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
}

.hero .eyebrow {
  color: #77d8cd;
}

.eyebrow::before {
  width: 22px;
  height: 3px;
  background: currentColor;
  content: "";
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  letter-spacing: 0;
  line-height: 1.22;
}

.hero h1 {
  max-width: 620px;
  margin-bottom: 20px;
  font-size: clamp(42px, 6vw, 76px);
}

.hero-lead {
  max-width: 610px;
  margin-bottom: 28px;
  color: #d5dcda;
  font-size: 18px;
}

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

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin: 26px 0 0;
  padding: 0;
  color: #abb8b5;
  font-size: 13px;
  list-style: none;
}

.hero-meta li::before {
  margin-right: 7px;
  color: var(--yellow);
  content: "●";
}

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

.phone {
  position: absolute;
  overflow: hidden;
  width: 228px;
  padding: 8px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 24px;
  background: #0d1111;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.4);
}

.phone img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: 17px;
}

.phone.back {
  top: 40px;
  right: 10px;
  transform: rotate(5deg);
}

.phone.front {
  bottom: 0;
  left: 18px;
  z-index: 2;
  transform: rotate(-4deg);
}

.visual-note {
  position: absolute;
  right: 0;
  bottom: 34px;
  z-index: 3;
  width: 178px;
  padding: 15px 16px;
  border-left: 4px solid var(--yellow);
  color: var(--ink);
  background: var(--white);
  box-shadow: var(--shadow);
  font-size: 13px;
  font-weight: 700;
}

.trust-strip {
  position: relative;
  z-index: 4;
  margin-top: -26px;
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line);
  background: var(--white);
  box-shadow: var(--shadow);
}

.trust-item {
  min-width: 0;
  padding: 22px 24px;
  border-right: 1px solid var(--line);
}

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

.trust-item strong {
  display: block;
  font-size: 22px;
  line-height: 1.2;
}

.trust-item span {
  color: var(--muted);
  font-size: 13px;
}

.section {
  padding: 92px 0;
}

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

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

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 30px;
  margin-bottom: 40px;
}

.section-heading h2 {
  max-width: 680px;
  margin-bottom: 0;
  font-size: clamp(30px, 4vw, 46px);
}

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

.dark .text-link {
  color: #78d7cd;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 18px;
}

.feature-card {
  grid-column: span 4;
  min-height: 238px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.feature-card.wide {
  grid-column: span 8;
  display: grid;
  grid-template-columns: 1fr 0.9fr;
  gap: 30px;
  color: var(--white);
  background: var(--teal);
  border-color: var(--teal);
}

.feature-index {
  display: inline-grid;
  width: 42px;
  height: 42px;
  margin-bottom: 30px;
  place-items: center;
  border-radius: 50%;
  color: var(--teal-dark);
  background: #dff1ee;
  font-weight: 900;
}

.feature-card.wide .feature-index {
  color: var(--ink);
  background: var(--yellow);
}

.feature-card h3 {
  margin-bottom: 12px;
  font-size: 22px;
}

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

.feature-card.wide p {
  color: #d6eeeb;
}

.mini-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.mini-list li {
  padding: 9px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.mini-list li:last-child {
  border-bottom: 0;
}

.showcase {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  align-items: center;
  gap: 70px;
}

.showcase-copy h2 {
  margin-bottom: 22px;
  font-size: clamp(32px, 4vw, 48px);
}

.showcase-points {
  display: grid;
  gap: 18px;
  margin-top: 30px;
}

.showcase-point {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
}

.showcase-point b {
  color: var(--coral);
}

.showcase-point p {
  margin-bottom: 0;
  color: #b7c2bf;
}

.screen-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
}

.screen-frame {
  overflow: hidden;
  width: min(31%, 230px);
  border: 7px solid #0b1110;
  border-radius: 20px;
  background: #0b1110;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.42);
}

.screen-frame:nth-child(2) {
  transform: translateY(28px);
}

.screen-frame img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: 13px;
}

.path-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.path-card {
  position: relative;
  min-height: 280px;
  padding: 30px;
  border-top: 4px solid var(--teal);
  border-radius: 0 0 8px 8px;
  background: var(--white);
}

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

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

.path-card .label {
  display: block;
  margin-bottom: 24px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.path-card h3 {
  margin-bottom: 14px;
  font-size: 24px;
}

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

.path-card .text-link {
  position: absolute;
  left: 30px;
  bottom: 26px;
}

.review-grid {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: 40px;
}

.score-panel {
  padding: 36px;
  color: var(--white);
  background: var(--teal);
  border-radius: 8px;
}

.score-panel strong {
  display: block;
  margin-bottom: 8px;
  font-size: 68px;
  line-height: 1;
}

.stars {
  color: var(--yellow);
  font-size: 20px;
  letter-spacing: 0;
}

.quote-list {
  display: grid;
  gap: 16px;
}

blockquote {
  margin: 0;
  padding: 22px 26px;
  border-left: 3px solid var(--coral);
  background: var(--white);
}

blockquote p {
  margin-bottom: 10px;
}

blockquote footer {
  color: var(--muted);
  font-size: 13px;
}

.faq-list {
  border-top: 1px solid var(--line);
}

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

.faq-question {
  display: grid;
  width: 100%;
  grid-template-columns: 1fr 32px;
  align-items: center;
  gap: 20px;
  padding: 22px 0;
  border: 0;
  color: var(--ink);
  background: transparent;
  font: inherit;
  font-weight: 800;
  text-align: left;
  cursor: pointer;
}

.faq-question span:last-child {
  display: grid;
  width: 28px;
  height: 28px;
  place-items: center;
  border-radius: 50%;
  color: var(--teal-dark);
  background: #dff1ee;
  transition: transform 0.2s ease;
}

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

.faq-answer {
  display: none;
  max-width: 850px;
  padding: 0 48px 22px 0;
  color: var(--muted);
}

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

.download-band {
  padding: 58px 0;
  color: var(--white);
  background: var(--teal-dark);
}

.download-band-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
}

.download-band h2 {
  margin-bottom: 8px;
  font-size: clamp(28px, 4vw, 42px);
}

.download-band p {
  margin-bottom: 0;
  color: #c7e5e1;
}

.site-footer {
  padding: 56px 0 28px;
  color: #bac4c2;
  background: #101716;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.6fr 0.8fr;
  gap: 60px;
  padding-bottom: 36px;
}

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

.footer-intro {
  max-width: 480px;
  margin: 18px 0 0;
  font-size: 14px;
}

.footer-col h3 {
  margin-bottom: 16px;
  color: var(--white);
  font-size: 15px;
}

.footer-col a {
  display: block;
  margin: 8px 0;
  font-size: 14px;
}

.footer-col a:hover {
  color: #78d7cd;
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid #293230;
  font-size: 12px;
}

.footer-bottom p {
  margin-bottom: 6px;
}

.inner-hero {
  padding: 78px 0 64px;
  color: var(--white);
  background: var(--ink);
}

.inner-hero-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 50px;
}

.inner-hero h1 {
  max-width: 820px;
  margin-bottom: 20px;
  font-size: clamp(38px, 6vw, 64px);
}

.inner-hero p {
  max-width: 760px;
  margin-bottom: 0;
  color: #c2cdca;
  font-size: 18px;
}

.crumbs {
  margin-bottom: 20px;
  color: #89d7ce;
  font-size: 13px;
}

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

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  align-items: start;
  gap: 64px;
}

.article h2 {
  margin: 56px 0 22px;
  font-size: 32px;
}

.article h2:first-child {
  margin-top: 0;
}

.article h3 {
  margin: 28px 0 10px;
  font-size: 21px;
}

.article p,
.article li {
  color: #40504d;
}

.article a {
  color: var(--teal-dark);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.article ol,
.article ul {
  padding-left: 22px;
}

.steps {
  display: grid;
  gap: 18px;
  margin-top: 26px;
}

.step {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 18px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.step-number {
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border-radius: 50%;
  color: var(--white);
  background: var(--teal);
  font-size: 18px;
  font-weight: 900;
}

.step h3 {
  margin-top: 0;
}

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

.article-shot {
  width: min(100%, 280px);
  max-width: 400px;
  height: auto;
  margin: 26px auto;
  border: 6px solid var(--ink);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.notice {
  margin: 26px 0;
  padding: 20px 22px;
  border-left: 4px solid var(--yellow);
  background: #fff9e8;
}

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

.article-aside {
  position: sticky;
  top: 96px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

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

.article-aside a:not(.button) {
  display: block;
  padding: 8px 0;
  color: var(--muted);
  font-size: 14px;
}

.article-aside .button {
  width: 100%;
  margin-top: 18px;
}

.function-table {
  overflow: hidden;
  margin: 24px 0;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.function-row {
  display: grid;
  grid-template-columns: 170px 1fr;
  border-bottom: 1px solid var(--line);
}

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

.function-row strong,
.function-row span {
  padding: 16px 18px;
}

.function-row strong {
  color: var(--teal-dark);
  background: #eaf4f2;
}

.function-row span {
  color: #40504d;
  background: var(--white);
}

@media (max-width: 900px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    inset: 72px 0 auto;
    display: none;
    padding: 18px 20px 24px;
    border-bottom: 1px solid var(--line);
    background: var(--paper);
    box-shadow: 0 20px 40px rgba(23, 32, 31, 0.14);
  }

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

  .site-nav a {
    padding: 12px;
  }

  .hero-grid,
  .showcase,
  .review-grid,
  .article-layout {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    min-height: 470px;
    max-width: 560px;
    width: 100%;
    margin-inline: auto;
  }

  .feature-card {
    grid-column: span 6;
  }

  .feature-card.wide {
    grid-column: span 12;
  }

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

  .path-card {
    min-height: 230px;
  }

  .article-aside {
    position: static;
  }

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

  .footer-grid > :first-child {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(calc(100% - 28px), var(--max));
  }

  .hero {
    padding-top: 58px;
  }

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

  .hero-grid {
    gap: 20px;
  }

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

  .phone {
    width: 140px;
  }

  .phone.front {
    left: 0;
  }

  .phone.back {
    top: 0;
    right: 0;
  }

  .visual-note {
    right: 0;
    bottom: 0;
    width: 136px;
    padding: 10px;
    font-size: 11px;
  }

  .inner-hero-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

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

  .trust-item:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .section {
    padding: 66px 0;
  }

  .section-heading,
  .download-band-inner,
  .inner-hero-grid {
    align-items: flex-start;
    flex-direction: column;
  }

  .section-heading,
  .download-band-inner {
    display: flex;
  }

  .feature-card,
  .feature-card.wide {
    grid-column: span 12;
  }

  .feature-card.wide {
    grid-template-columns: 1fr;
  }

  .screen-row {
    gap: 8px;
  }

  .screen-frame {
    width: 32%;
    border-width: 4px;
    border-radius: 12px;
  }

  .screen-frame img {
    border-radius: 8px;
  }

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

  .function-row strong {
    padding-bottom: 8px;
  }

  .function-row span {
    padding-top: 8px;
  }

  .step {
    grid-template-columns: 42px 1fr;
    padding: 18px;
  }

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

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

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