:root {
  --ink: #17191f;
  --ink-soft: #232733;
  --paper: #f7f5ef;
  --white: #ffffff;
  --red: #f24b4b;
  --red-dark: #cf343f;
  --mint: #47d7ac;
  --gold: #f2c14e;
  --text: #252830;
  --muted: #6b707c;
  --line: #deded9;
  --shadow: 0 18px 50px rgba(23, 25, 31, 0.12);
  --radius: 8px;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--paper);
  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;
}

body.menu-open {
  overflow: hidden;
}

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

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

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

button,
.button,
summary {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 8px 12px;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-160%);
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(23, 25, 31, 0.96);
  backdrop-filter: blur(14px);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--white);
  font-weight: 800;
  white-space: nowrap;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  padding: 8px 13px;
  color: #d9dbe1;
  font-size: 15px;
  border-radius: 6px;
}

.nav-links a:hover,
.nav-links a:focus-visible,
.nav-links a[aria-current="page"] {
  color: var(--white);
  background: rgba(255, 255, 255, 0.09);
}

.nav-links .nav-download {
  margin-left: 6px;
  color: var(--ink);
  background: var(--mint);
  font-weight: 800;
}

.nav-links .nav-download:hover,
.nav-links .nav-download:focus-visible {
  color: var(--ink);
  background: #70e6c1;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 6px;
  color: var(--white);
  background: transparent;
  cursor: pointer;
}

.menu-toggle span,
.menu-toggle::before,
.menu-toggle::after {
  display: block;
  width: 20px;
  height: 2px;
  margin: 4px auto;
  content: "";
  background: currentColor;
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: 720px;
  color: var(--white);
  background: var(--ink);
}

.hero::after {
  position: absolute;
  right: -5vw;
  bottom: -170px;
  width: 520px;
  height: 520px;
  border: 80px solid rgba(71, 215, 172, 0.1);
  border-radius: 50%;
  content: "";
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  min-height: 720px;
  grid-template-columns: 1.02fr 0.98fr;
  align-items: center;
  gap: 72px;
  padding: 84px 0 70px;
}

.hero-copy {
  position: relative;
  z-index: 4;
}

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

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

.hero h1 {
  max-width: 640px;
  margin: 0;
  font-size: 72px;
  line-height: 1.06;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}

.hero-copy > p:not(.eyebrow) {
  max-width: 650px;
  margin: 24px 0 0;
  color: #c9cbd2;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 800;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
}

.button-primary {
  color: var(--white);
  background: var(--red);
  box-shadow: 0 10px 30px rgba(242, 75, 75, 0.25);
}

.button-primary:hover,
.button-primary:focus-visible {
  background: var(--red-dark);
}

.button-secondary {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.28);
  background: transparent;
}

.button-secondary:hover,
.button-secondary:focus-visible {
  border-color: var(--mint);
  background: rgba(71, 215, 172, 0.08);
}

.hero-note {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 24px;
  color: #979ba6;
  font-size: 13px;
}

.hero-note span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.hero-note span::before {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  content: "";
  background: var(--mint);
}

.phone-stage {
  position: relative;
  align-self: center;
  min-height: 530px;
}

.phone {
  position: absolute;
  overflow: hidden;
  width: min(250px, 62vw);
  padding: 10px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 34px;
  background: #090a0d;
  box-shadow: 0 32px 70px rgba(0, 0, 0, 0.42);
}

.phone img {
  width: 100%;
  height: auto;
  aspect-ratio: 360 / 639;
  object-fit: contain;
  border-radius: 25px;
}

.phone-main {
  top: 52px;
  right: 8%;
  z-index: 2;
}

.phone-back {
  top: 46px;
  left: 5%;
  z-index: 1;
  transform: rotate(-7deg);
  opacity: 0.82;
}

.stamp {
  position: absolute;
  right: 1%;
  bottom: 10px;
  z-index: 3;
  display: grid;
  width: 116px;
  height: 116px;
  place-items: center;
  border: 2px solid var(--gold);
  border-radius: 50%;
  color: var(--gold);
  background: var(--ink-soft);
  font-size: 14px;
  font-weight: 800;
  text-align: center;
  transform: rotate(8deg);
}

.status-bar {
  position: relative;
  z-index: 2;
  margin-top: 0;
}

.status-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid #e1e0da;
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow);
}

.status-item {
  padding: 24px 26px;
  border-right: 1px solid #e1e0da;
}

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

.status-item strong {
  display: block;
  color: var(--ink);
  font-size: 18px;
}

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

.section {
  padding: 104px 0;
}

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

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

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 46px;
}

.section-heading h2 {
  max-width: 720px;
  margin: 0;
  color: var(--ink);
  font-size: 48px;
  line-height: 1.15;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}

.section-dark .section-heading h2 {
  color: var(--white);
}

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

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
}

.feature-item {
  min-height: 220px;
  padding: 38px;
  background: var(--white);
}

.feature-number {
  color: var(--red);
  font-family: Consolas, Monaco, monospace;
  font-size: 13px;
  font-weight: 800;
}

.feature-item h3 {
  margin: 48px 0 10px;
  color: var(--ink);
  font-size: 23px;
}

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

.screen-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.screen-item {
  margin: 0;
}

.screen-frame {
  position: relative;
  overflow: hidden;
  max-width: 400px;
  margin: 0 auto;
  padding: 8px;
  border: 1px solid #3b404d;
  border-radius: 26px;
  background: #0b0c0f;
  cursor: zoom-in;
}

.screen-frame img {
  width: 100%;
  height: auto;
  aspect-ratio: 360 / 639;
  object-fit: contain;
  border-radius: 19px;
}

.screen-item figcaption {
  margin-top: 16px;
  color: #cfd1d7;
  text-align: center;
}

.screen-item figcaption strong {
  display: block;
  color: var(--white);
  font-size: 17px;
}

.path-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
}

.path-panel {
  position: relative;
  overflow: hidden;
  min-height: 360px;
  padding: 46px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.path-panel.accent {
  color: var(--white);
  border-color: var(--red);
  background: var(--red);
}

.path-panel .path-index {
  color: var(--red);
  font-family: Consolas, Monaco, monospace;
  font-weight: 800;
}

.path-panel.accent .path-index {
  color: var(--ink);
}

.path-panel h3 {
  max-width: 420px;
  margin: 70px 0 14px;
  font-size: 32px;
  line-height: 1.2;
}

.path-panel p {
  max-width: 520px;
  margin: 0 0 28px;
  color: var(--muted);
}

.path-panel.accent p {
  color: #fff3f3;
}

.path-panel a {
  display: inline-block;
  font-weight: 800;
  border-bottom: 2px solid currentColor;
}

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

.voice {
  margin: 0;
  padding: 30px;
  border-left: 4px solid var(--red);
  background: var(--white);
  box-shadow: 0 10px 30px rgba(23, 25, 31, 0.06);
}

.voice p {
  margin: 0 0 22px;
  color: var(--text);
}

.voice cite {
  color: var(--muted);
  font-size: 14px;
  font-style: normal;
}

.cta-band {
  padding: 70px 0;
  color: var(--white);
  background: var(--ink);
}

.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.cta-inner h2 {
  margin: 0 0 8px;
  font-size: 34px;
  line-height: 1.2;
}

.cta-inner p {
  margin: 0;
  color: #b9bdc7;
}

.cta-note {
  color: #b9bdc7;
}

.page-hero {
  padding: 96px 0 82px;
  color: var(--white);
  background: var(--ink);
}

.breadcrumb {
  margin: 0 0 24px;
  color: #969ba7;
  font-size: 14px;
}

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

.page-hero h1 {
  max-width: 900px;
  margin: 0;
  font-size: 64px;
  line-height: 1.08;
  letter-spacing: 0;
  overflow-wrap: anywhere;
  word-break: break-all;
}

.page-hero p {
  max-width: 760px;
  margin: 24px 0 0;
  color: #c7cad1;
  font-size: 18px;
}

.article-layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 72px;
  padding: 76px 0 110px;
}

.article {
  min-width: 0;
}

.article-nav {
  position: sticky;
  top: 96px;
  align-self: start;
  border-top: 4px solid var(--red);
  background: var(--white);
  box-shadow: 0 8px 30px rgba(23, 25, 31, 0.06);
}

.article-nav strong {
  display: block;
  padding: 18px 20px 10px;
}

.article-nav a {
  display: block;
  padding: 10px 20px;
  color: var(--muted);
  font-size: 14px;
}

.article-nav a:last-child {
  padding-bottom: 20px;
}

.article-nav a:hover,
.article-nav a:focus-visible {
  color: var(--red-dark);
}

.article h2 {
  margin: 76px 0 24px;
  color: var(--ink);
  font-size: 34px;
  line-height: 1.25;
}

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

.article h3 {
  margin: 34px 0 12px;
  color: var(--ink);
  font-size: 22px;
}

.article p {
  margin: 0 0 18px;
}

.article a:not(.button) {
  color: var(--red-dark);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.step-list {
  display: grid;
  gap: 18px;
  margin: 28px 0;
}

.step {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 22px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.step-count {
  display: grid;
  width: 56px;
  height: 56px;
  place-items: center;
  border-radius: 50%;
  color: var(--white);
  background: var(--red);
  font-family: Consolas, Monaco, monospace;
  font-weight: 800;
}

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

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

.notice {
  margin: 28px 0;
  padding: 24px 26px;
  border-left: 4px solid var(--gold);
  background: #fff9e9;
}

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

.check-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding: 16px 18px 16px 46px;
  border: 1px solid var(--line);
  background: var(--white);
}

.check-list li::before {
  position: absolute;
  top: 17px;
  left: 18px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  color: var(--ink);
  background: var(--mint);
  content: "✓";
  font-size: 12px;
  font-weight: 900;
  line-height: 18px;
  text-align: center;
}

.feature-deep-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin: 30px 0 60px;
}

.deep-item {
  padding: 30px;
  border-top: 4px solid var(--red);
  background: var(--white);
  box-shadow: 0 10px 30px rgba(23, 25, 31, 0.06);
}

.deep-item h3 {
  margin-top: 0;
}

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

.faq-list {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}

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

.faq-item summary {
  position: relative;
  padding: 21px 54px 21px 22px;
  color: var(--ink);
  cursor: pointer;
  font-weight: 800;
  list-style: none;
}

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

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

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

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

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

.related-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 28px;
}

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

.related-link strong {
  display: block;
  margin-bottom: 5px;
  color: var(--ink);
}

.related-link span {
  color: var(--muted);
  font-size: 14px;
}

.site-footer {
  padding: 56px 0 26px;
  color: #b2b6c0;
  background: #101116;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 42px;
  padding-bottom: 38px;
}

.footer-brand p {
  max-width: 620px;
  margin: 16px 0 0;
  color: #858a96;
  font-size: 14px;
}

.footer-links {
  display: flex;
  align-items: start;
  gap: 24px;
}

.footer-links a {
  color: #d1d3d9;
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-top: 22px;
  border-top: 1px solid #282b33;
  color: #737985;
  font-size: 13px;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  place-items: center;
  padding: 24px;
  background: rgba(8, 9, 12, 0.92);
}

.lightbox.is-open {
  display: grid;
}

.lightbox img {
  width: auto;
  max-width: min(400px, 90vw);
  max-height: 84vh;
  border-radius: 20px;
}

.lightbox button {
  position: absolute;
  top: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  color: var(--white);
  background: transparent;
  cursor: pointer;
  font-size: 26px;
}

@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 30px;
    padding-top: 64px;
  }

  .hero-copy {
    max-width: none;
  }

  .phone-stage {
    width: min(100%, 600px);
    margin: 0 auto;
  }

  .phone-main {
    top: 8px;
    right: 12%;
  }

  .phone-back {
    top: 56px;
    left: 3%;
  }

  .stamp {
    right: 0;
    bottom: 18px;
  }

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

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

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

  .path-grid,
  .article-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .article-nav {
    position: static;
    display: none;
  }
}

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

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

  .menu-toggle {
    display: block;
  }

  .nav-links {
    position: fixed;
    top: 64px;
    right: 0;
    left: 0;
    display: none;
    align-items: stretch;
    padding: 12px 14px 22px;
    border-top: 1px solid #30333b;
    background: var(--ink);
    flex-direction: column;
  }

  .nav-links.is-open {
    display: flex;
  }

  .nav-links a {
    padding: 12px 14px;
  }

  .nav-links .nav-download {
    margin: 5px 0 0;
    text-align: center;
  }

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

  .hero-grid {
    padding: 48px 0 26px;
  }

  .hero h1 {
    font-size: 37px;
  }

  .section-heading h2 {
    font-size: 38px;
  }

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

  .phone-stage {
    min-height: 300px;
  }

  .phone {
    width: 168px;
  }

  .phone-main {
    right: 4%;
  }

  .phone-back {
    top: 42px;
    left: 0;
  }

  .stamp {
    right: 4px;
    bottom: 6px;
    width: 76px;
    height: 76px;
    font-size: 12px;
  }

  .section {
    padding: 72px 0;
  }

  .section-heading {
    align-items: start;
    flex-direction: column;
    margin-bottom: 34px;
  }

  .feature-grid,
  .voice-grid,
  .feature-deep-grid,
  .related-links,
  .check-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .screen-grid {
    gap: 34px 14px;
  }

  .path-panel {
    min-height: 320px;
    padding: 32px;
  }

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

  .page-hero {
    padding: 72px 0 62px;
  }

  .page-hero h1 {
    font-size: 40px;
  }

  .article-layout {
    padding: 56px 0 80px;
  }

  .article h2 {
    margin-top: 56px;
    font-size: 29px;
  }

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

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

  .footer-links {
    flex-wrap: wrap;
  }
}

@media (max-width: 440px) {
  .brand span {
    font-size: 15px;
  }

  .brand img {
    width: 38px;
    height: 38px;
  }

  .hero h1 {
    font-size: 37px;
  }

  .hero-actions .button {
    width: auto;
  }

  .phone-stage {
    min-height: 285px;
  }

  .phone {
    width: 158px;
  }

  .status-item {
    padding: 18px 16px;
  }

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

  .screen-frame {
    width: min(100%, 300px);
  }

  .feature-item {
    padding: 28px;
  }

  .feature-item h3 {
    margin-top: 32px;
  }
}

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

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