:root {
  --ink: #151719;
  --muted: #59636d;
  --paper: #ffffff;
  --soft: #f3f6f7;
  --line: #cdd8dc;
  --ice: #bcebf2;
  --orange: #ff7a1a;
  --orange-dark: #c94f00;
  --max: 1160px;
}

* {
  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;
  line-height: 1.75;
  letter-spacing: 0;
}

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

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

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

.skip-link {
  position: fixed;
  left: 12px;
  top: -60px;
  z-index: 100;
  padding: 10px 14px;
  background: var(--paper);
  border: 2px solid var(--ink);
}

.skip-link:focus {
  top: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
}

.header-inner,
.hero-inner,
.section-inner,
.footer-inner {
  width: min(calc(100% - 40px), var(--max));
  margin-inline: auto;
}

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

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

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 6px;
}

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

.site-nav a {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  padding: 7px 14px;
  color: #36414a;
  font-size: 15px;
  font-weight: 650;
  border-bottom: 2px solid transparent;
}

.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav a[aria-current="page"] {
  color: var(--ink);
  border-color: var(--orange);
}

.download-link,
.button-primary,
.button-secondary {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 6px;
  font-weight: 800;
  line-height: 1.2;
}

.download-link,
.button-primary {
  color: #111315;
  background: var(--orange);
  border: 2px solid var(--orange);
}

.download-link:hover,
.button-primary:hover {
  background: #ff9348;
  border-color: #ff9348;
}

.button-secondary {
  background: var(--paper);
  border: 2px solid var(--ink);
}

.button-secondary:hover {
  color: var(--orange-dark);
  border-color: var(--orange-dark);
}

.menu-button {
  width: 44px;
  height: 44px;
  display: none;
  place-items: center;
  padding: 0;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
}

.menu-icon,
.menu-icon::before,
.menu-icon::after {
  width: 19px;
  height: 2px;
  display: block;
  background: var(--ink);
  content: "";
}

.menu-icon::before {
  transform: translateY(-6px);
}

.menu-icon::after {
  transform: translateY(4px);
}

.hero {
  background: var(--ink);
  color: var(--paper);
  overflow: hidden;
}

.hero-inner {
  min-height: 590px;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
  align-items: center;
  gap: clamp(48px, 7vw, 96px);
  padding-block: 42px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 10px;
  color: var(--orange);
  font-size: 13px;
  font-weight: 850;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 620px;
  margin: 0;
  font-size: clamp(44px, 5vw, 70px);
  line-height: 1.12;
  letter-spacing: 0;
}

.hero-copy > p:not(.eyebrow) {
  max-width: 600px;
  margin: 22px 0 0;
  color: #d7dfe2;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.hero .button-secondary {
  color: var(--paper);
  background: transparent;
  border-color: #7e8b91;
}

.hero-media {
  position: relative;
  min-height: 506px;
  display: grid;
  place-items: center;
}

.hero-index {
  position: absolute;
  inset: 24px 0 24px auto;
  width: 92%;
  border-block: 1px solid #536068;
}

.hero-index::before,
.hero-index::after {
  position: absolute;
  right: 0;
  color: var(--ice);
  font-family: Consolas, monospace;
  font-size: 12px;
}

.hero-index::before {
  top: 12px;
  content: "INDEX / 01";
}

.hero-index::after {
  bottom: 12px;
  content: "BROWSE / READ";
}

.hero-phone {
  position: relative;
  z-index: 2;
  width: 236px;
  max-width: 400px;
  height: auto;
  border: 8px solid #2a2e31;
  border-radius: 8px;
  box-shadow: 26px 30px 0 var(--orange), -22px -20px 0 rgba(188, 235, 242, 0.18);
}

.section {
  padding-block: 84px;
}

.section-soft {
  background: var(--soft);
  border-block: 1px solid var(--line);
}

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

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 34px;
}

.section-heading h2,
.content-header h1 {
  margin: 0;
  line-height: 1.2;
  letter-spacing: 0;
}

.section-heading h2 {
  font-size: clamp(30px, 3.4vw, 46px);
}

.section-note {
  max-width: 560px;
  color: var(--muted);
}

.section-dark .section-note {
  color: #c8d0d4;
}

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

.feature-item {
  min-height: 230px;
  padding: 26px 22px;
  background: var(--paper);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.feature-number {
  display: block;
  margin-bottom: 42px;
  color: var(--orange-dark);
  font-family: Consolas, monospace;
  font-size: 13px;
  font-weight: 800;
}

.feature-item h3,
.workflow-step h3,
.link-panel h3 {
  margin: 0 0 10px;
  line-height: 1.35;
  letter-spacing: 0;
}

.feature-item p,
.workflow-step p,
.link-panel p {
  margin: 0;
  color: var(--muted);
}

.gallery-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.85fr 0.85fr;
  align-items: end;
  gap: 22px;
}

.shot {
  margin: 0;
}

.shot-frame {
  min-height: 500px;
  display: grid;
  place-items: center;
  padding: 26px;
  background: #e5edf0;
  border: 1px solid #b8c6cb;
}

.shot:first-child .shot-frame {
  background: var(--ice);
}

.shot img {
  width: auto;
  max-width: 400px;
  max-height: 560px;
  height: auto;
  border: 5px solid var(--ink);
  border-radius: 6px;
}

.shot figcaption {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  padding-top: 14px;
  font-size: 14px;
  line-height: 1.55;
}

.shot figcaption strong {
  color: var(--orange-dark);
  font-family: Consolas, monospace;
}

.workflow {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1px;
  background: #465159;
  border: 1px solid #465159;
}

.workflow-step {
  min-height: 210px;
  padding: 28px;
  background: var(--ink);
}

.workflow-step b {
  display: inline-grid;
  width: 38px;
  height: 38px;
  place-items: center;
  margin-bottom: 28px;
  color: var(--ink);
  background: var(--ice);
  font-family: Consolas, monospace;
}

.workflow-step p {
  color: #cbd3d6;
}

.deep-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}

.link-panel {
  position: relative;
  min-height: 250px;
  padding: 30px;
  border: 2px solid var(--ink);
  border-radius: 8px;
}

.link-panel::after {
  position: absolute;
  right: 28px;
  bottom: 22px;
  color: var(--orange-dark);
  content: "→";
  font-size: 30px;
}

.link-panel .panel-tag {
  display: block;
  margin-bottom: 54px;
  color: var(--orange-dark);
  font-family: Consolas, monospace;
  font-size: 13px;
  font-weight: 800;
}

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

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

.faq-question {
  width: 100%;
  min-height: 70px;
  display: grid;
  grid-template-columns: 1fr 32px;
  align-items: center;
  gap: 20px;
  padding: 18px 4px;
  color: var(--ink);
  background: transparent;
  border: 0;
  text-align: left;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.faq-question::after {
  content: "+";
  font-size: 26px;
  font-weight: 400;
  text-align: center;
}

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

.faq-answer {
  max-width: 880px;
  padding: 0 44px 22px 4px;
  color: var(--muted);
}

.faq-answer p {
  margin: 0;
}

.cta-band {
  padding-block: 64px;
  background: var(--ice);
  border-block: 1px solid #8dcbd5;
}

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

.cta-inner h2 {
  max-width: 700px;
  margin: 0;
  font-size: clamp(28px, 3.2vw, 44px);
  line-height: 1.25;
}

.content-hero {
  padding-block: 72px 64px;
  background: var(--ink);
  color: var(--paper);
}

.content-header {
  max-width: 820px;
}

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

.content-header p {
  margin: 20px 0 0;
  color: #d2dade;
  font-size: 18px;
}

.article-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 760px);
  justify-content: space-between;
  gap: 72px;
}

.article-index {
  align-self: start;
  position: sticky;
  top: 104px;
  padding-top: 14px;
  border-top: 2px solid var(--orange);
}

.article-index strong {
  display: block;
  margin-bottom: 12px;
  font-family: Consolas, monospace;
  font-size: 12px;
}

.article-index a {
  display: block;
  padding: 8px 0;
  color: var(--muted);
  font-size: 14px;
}

.article-index a:hover {
  color: var(--orange-dark);
}

.article-body section {
  scroll-margin-top: 100px;
  padding-bottom: 54px;
  margin-bottom: 54px;
  border-bottom: 1px solid var(--line);
}

.article-body section:last-child {
  margin-bottom: 0;
}

.article-body h2 {
  margin: 0 0 20px;
  font-size: 30px;
  line-height: 1.3;
  letter-spacing: 0;
}

.article-body h3 {
  margin: 28px 0 8px;
  font-size: 20px;
}

.article-body p,
.article-body li {
  color: #3f4a52;
}

.article-body ul,
.article-body ol {
  padding-left: 1.4em;
}

.notice {
  margin: 24px 0;
  padding: 18px 20px;
  background: #eef9fb;
  border-left: 4px solid #5eb9c8;
}

.step-list {
  list-style: none;
  padding: 0 !important;
  counter-reset: steps;
}

.step-list li {
  position: relative;
  min-height: 66px;
  padding: 0 0 28px 58px;
  counter-increment: steps;
}

.step-list li::before {
  position: absolute;
  left: 0;
  top: 0;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  color: var(--paper);
  background: var(--ink);
  content: counter(steps, decimal-leading-zero);
  font-family: Consolas, monospace;
  font-size: 12px;
}

.site-footer {
  padding-block: 34px;
  background: #101214;
  color: #b9c1c5;
  text-align: center;
}

.footer-inner {
  display: grid;
  justify-items: center;
  gap: 8px;
}

.footer-inner p {
  max-width: 860px;
  margin: 0;
  font-size: 13px;
}

@media (max-width: 920px) {
  .header-inner,
  .hero-inner,
  .section-inner,
  .footer-inner {
    width: min(calc(100% - 32px), var(--max));
  }

  .header-inner {
    min-height: 64px;
  }

  .menu-button {
    display: grid;
  }

  .header-download {
    display: none;
  }

  .site-nav {
    position: absolute;
    inset: 64px 16px auto;
    display: none;
    padding: 10px;
    background: var(--paper);
    border: 1px solid var(--line);
    box-shadow: 0 16px 36px rgba(21, 23, 25, 0.14);
  }

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

  .site-nav a {
    justify-content: center;
  }

  .hero-inner {
    min-height: 0;
    grid-template-columns: 1fr;
    gap: 28px;
    padding-block: 34px 28px;
  }

  .hero h1 {
    font-size: clamp(38px, 11vw, 54px);
  }

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

  .hero-actions {
    margin-top: 20px;
  }

  .hero-media {
    min-height: 378px;
  }

  .hero-index {
    inset: 10px 0;
    width: 100%;
  }

  .hero-phone {
    width: 174px;
    border-width: 6px;
    box-shadow: 18px 18px 0 var(--orange), -14px -12px 0 rgba(188, 235, 242, 0.18);
  }

  .section {
    padding-block: 62px;
  }

  .section-heading {
    display: block;
    margin-bottom: 26px;
  }

  .section-note {
    margin-top: 12px;
  }

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

  .gallery-grid {
    grid-template-columns: 1fr;
    align-items: stretch;
  }

  .shot-frame {
    min-height: 420px;
  }

  .shot img {
    max-height: 520px;
  }

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

  .article-layout {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .article-index {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 18px;
  }

  .article-index strong {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  .brand img {
    width: 34px;
    height: 34px;
  }

  .hero-inner {
    gap: 22px;
    padding-top: 28px;
    padding-bottom: 24px;
  }

  .hero h1 {
    max-width: none;
    font-size: 38px;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .hero-media {
    min-height: 350px;
  }

  .hero-phone {
    width: 158px;
  }

  .section {
    padding-block: 52px;
  }

  .feature-grid,
  .deep-links {
    grid-template-columns: 1fr;
  }

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

  .feature-number {
    margin-bottom: 22px;
  }

  .shot-frame {
    min-height: 360px;
    padding: 20px;
  }

  .cta-inner {
    align-items: stretch;
    flex-direction: column;
  }

  .content-hero {
    padding-block: 52px 46px;
  }

  .content-header h1 {
    font-size: 38px;
  }

  .article-index {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 360px) {
  .hero h1 {
    font-size: 32px;
  }
}

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