:root {
  --ink: #171717;
  --paper: #fffdf8;
  --white: #ffffff;
  --coral: #ff4e3a;
  --cyan: #16b7c9;
  --yellow: #f7d84a;
  --blue: #287ee7;
  --muted: #66645f;
  --line: #171717;
  --shadow: 7px 7px 0 #171717;
}

* {
  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%;
  height: auto;
}

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

button,
input {
  font: inherit;
}

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

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 999;
  padding: 8px 14px;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-150%);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 3px solid var(--ink);
  background: rgba(255, 253, 248, 0.96);
}

.nav-wrap {
  width: min(1180px, calc(100% - 32px));
  min-height: 74px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  font-size: 1.24rem;
  font-weight: 900;
}

.brand img {
  width: 44px;
  height: 44px;
  border: 2px solid var(--ink);
  border-radius: 6px;
}

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

.nav-links a {
  min-height: 42px;
  padding: 7px 13px;
  display: inline-flex;
  align-items: center;
  font-size: 0.93rem;
  font-weight: 800;
  border-bottom: 3px solid transparent;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  border-color: var(--coral);
}

.download-btn {
  min-width: 130px;
  min-height: 46px;
  padding: 9px 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--white);
  background: var(--coral);
  border: 2px solid var(--ink);
  border-radius: 4px;
  box-shadow: 4px 4px 0 var(--ink);
  font-weight: 900;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.download-btn::before {
  content: "↓";
  font-size: 1.15em;
  line-height: 1;
}

.download-btn:hover,
.download-btn:focus-visible {
  transform: translate(3px, 3px);
  box-shadow: 1px 1px 0 var(--ink);
}

.nav-download {
  min-width: 116px;
  min-height: 42px;
  padding: 7px 16px;
  box-shadow: 3px 3px 0 var(--ink);
}

.menu-toggle {
  width: 44px;
  height: 44px;
  padding: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: var(--yellow);
  border: 2px solid var(--ink);
  border-radius: 4px;
  font-size: 1.45rem;
  font-weight: 900;
  cursor: pointer;
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  min-height: 640px;
  position: relative;
  overflow: hidden;
  border-bottom: 3px solid var(--ink);
  background: var(--cyan);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0 0 auto auto;
  width: 18%;
  height: 100%;
  background: var(--yellow);
  border-left: 3px solid var(--ink);
}

.hero-collage {
  position: absolute;
  inset: 0;
  z-index: 1;
  overflow: hidden;
}

.hero-shot {
  position: absolute;
  width: min(22vw, 246px);
  max-width: 400px;
  border: 3px solid var(--ink);
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.hero-shot-one {
  top: 54px;
  right: 27%;
  transform: rotate(-5deg);
}

.hero-shot-two {
  top: 120px;
  right: 8%;
  transform: rotate(5deg);
}

.hero-shot-three {
  top: 320px;
  right: 18%;
  transform: rotate(1deg);
}

.hero-inner {
  min-height: 640px;
  position: relative;
  z-index: 3;
  display: flex;
  align-items: center;
}

.hero-copy {
  width: min(610px, 56%);
  margin: 72px 0;
  padding: 44px;
  color: var(--white);
  background: var(--ink);
  border: 3px solid var(--ink);
}

.eyebrow,
.section-kicker {
  display: block;
  margin-bottom: 10px;
  color: var(--coral);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0;
}

.hero h1 {
  max-width: 520px;
  margin: 0 0 18px;
  font-size: clamp(2.7rem, 6.6vw, 5.6rem);
  line-height: 1.02;
  letter-spacing: 0;
}

.hero-lead {
  max-width: 530px;
  margin: 0 0 26px;
  color: #ece8df;
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.hero-note {
  color: #d9d4ca;
  font-size: 0.82rem;
}

.fact-strip {
  border-bottom: 3px solid var(--ink);
  background: var(--yellow);
}

.facts {
  min-height: 92px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.fact {
  padding: 18px 22px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-left: 2px solid var(--ink);
}

.fact:last-child {
  border-right: 2px solid var(--ink);
}

.fact strong {
  font-size: 1.25rem;
  white-space: nowrap;
}

.fact span {
  color: #403d35;
  font-size: 0.82rem;
  line-height: 1.4;
}

.section {
  padding: 92px 0;
  border-bottom: 3px solid var(--ink);
}

.section-heading {
  margin-bottom: 34px;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
}

.section-heading h2 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.3rem);
  line-height: 1.12;
  letter-spacing: 0;
}

.section-index {
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  background: var(--cyan);
  border: 2px solid var(--ink);
  border-radius: 50%;
  font-size: 1.1rem;
  font-weight: 900;
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 3px solid var(--ink);
  background: var(--white);
  box-shadow: var(--shadow);
}

.process-item {
  min-height: 250px;
  padding: 26px;
  position: relative;
  border-right: 2px solid var(--ink);
}

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

.process-num {
  display: block;
  margin-bottom: 34px;
  color: var(--coral);
  font-size: 2rem;
  font-weight: 900;
}

.process-item h3 {
  margin: 0 0 10px;
  font-size: 1.3rem;
}

.process-item p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.process-item::after {
  content: "→";
  position: absolute;
  top: 20px;
  right: 16px;
  font-size: 1.5rem;
  font-weight: 900;
}

.process-item:last-child::after {
  content: "✓";
}

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

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

.feature-section .section-kicker {
  color: var(--yellow);
}

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

.feature-card {
  min-height: 226px;
  padding: 26px;
  color: var(--ink);
  background: var(--white);
  border: 2px solid var(--white);
  border-radius: 6px;
}

.feature-card:nth-child(2),
.feature-card:nth-child(5) {
  background: var(--cyan);
}

.feature-card:nth-child(3),
.feature-card:nth-child(6) {
  background: var(--yellow);
}

.feature-icon {
  width: 42px;
  height: 42px;
  margin-bottom: 30px;
  display: grid;
  place-items: center;
  background: var(--coral);
  border: 2px solid var(--ink);
  border-radius: 50%;
  color: var(--white);
  font-weight: 900;
}

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 1.25rem;
}

.feature-card p {
  margin: 0;
  font-size: 0.9rem;
}

.gallery-shell {
  position: relative;
}

.gallery-track {
  padding: 10px 8px 22px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(235px, 30%);
  gap: 24px;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  scroll-snap-type: inline mandatory;
  scrollbar-color: var(--coral) #dedad0;
}

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

.app-shot {
  width: 100%;
  max-width: 400px;
  height: auto;
  border: 3px solid var(--ink);
  border-radius: 10px;
  box-shadow: var(--shadow);
  cursor: zoom-in;
}

.shot-card figcaption {
  padding: 18px 4px 0;
  font-size: 0.92rem;
}

.shot-card strong {
  display: block;
  font-size: 1.08rem;
}

.gallery-controls {
  margin-top: 22px;
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.icon-button {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  background: var(--white);
  border: 2px solid var(--ink);
  border-radius: 4px;
  box-shadow: 3px 3px 0 var(--ink);
  font-size: 1.4rem;
  font-weight: 900;
  cursor: pointer;
}

.icon-button:hover {
  background: var(--yellow);
}

.content-links {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 22px;
}

.content-link {
  min-height: 300px;
  padding: 32px;
  position: relative;
  overflow: hidden;
  border: 3px solid var(--ink);
  box-shadow: var(--shadow);
}

.content-link:first-child {
  background: var(--coral);
  color: var(--white);
}

.content-link:last-child {
  background: var(--cyan);
}

.content-link .tag {
  display: inline-block;
  padding: 4px 9px;
  background: var(--ink);
  color: var(--white);
  font-size: 0.72rem;
  font-weight: 900;
}

.content-link h3 {
  max-width: 430px;
  margin: 70px 0 10px;
  font-size: clamp(1.7rem, 3vw, 2.7rem);
  line-height: 1.15;
}

.content-link p {
  max-width: 520px;
  margin: 0;
}

.content-link .arrow {
  position: absolute;
  right: 28px;
  bottom: 24px;
  font-size: 2.5rem;
  font-weight: 900;
}

.review-grid {
  display: grid;
  grid-template-columns: 0.7fr 1fr 1fr;
  gap: 18px;
}

.rating-panel,
.review-card {
  min-height: 250px;
  padding: 26px;
  border: 2px solid var(--ink);
}

.rating-panel {
  color: var(--white);
  background: var(--ink);
}

.rating-number {
  display: block;
  margin: 8px 0 0;
  font-size: 4.8rem;
  font-weight: 900;
  line-height: 1;
}

.stars {
  color: var(--yellow);
  font-size: 1.15rem;
}

.review-card {
  background: var(--white);
}

.review-card blockquote {
  margin: 0 0 24px;
  font-size: 1.03rem;
  font-weight: 700;
}

.review-card cite {
  color: var(--muted);
  font-size: 0.84rem;
  font-style: normal;
}

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

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

.faq-list summary {
  min-height: 68px;
  padding: 18px 52px 18px 4px;
  position: relative;
  display: flex;
  align-items: center;
  font-weight: 900;
  cursor: pointer;
  list-style: none;
}

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

.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 12px;
  font-size: 1.7rem;
}

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

.faq-answer {
  padding: 0 52px 22px 4px;
  color: var(--muted);
}

.faq-answer p {
  margin: 0;
}

.text-link {
  color: #075f6a;
  font-weight: 900;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.download-band {
  padding: 72px 0;
  color: var(--white);
  background: var(--blue);
  border-bottom: 3px solid var(--ink);
}

.download-band-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 30px;
}

.download-band h2 {
  margin: 0 0 8px;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.1;
}

.download-band p {
  margin: 0;
  color: #e8f1ff;
}

.site-footer {
  padding: 44px 0 28px;
  color: #d4d1c9;
  background: var(--ink);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
}

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

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

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
  gap: 10px 24px;
}

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

.disclaimer {
  margin: 28px 0 0;
  padding-top: 22px;
  border-top: 1px solid #4a4844;
  font-size: 0.78rem;
}

.copyright {
  margin: 8px 0 0;
  font-size: 0.78rem;
}

.page-hero {
  padding: 92px 0 76px;
  color: var(--white);
  background: var(--ink);
  border-bottom: 3px solid var(--ink);
}

.page-hero .breadcrumb {
  margin: 0 0 24px;
  color: #c9c5bc;
  font-size: 0.82rem;
}

.page-hero .breadcrumb a {
  color: var(--yellow);
}

.page-hero h1 {
  max-width: 860px;
  margin: 0 0 18px;
  font-size: clamp(2.6rem, 6vw, 5.2rem);
  line-height: 1.05;
}

.page-hero-copy {
  max-width: 760px;
  margin: 0;
  color: #dfdbd2;
  font-size: 1.05rem;
}

.guide-hero {
  box-shadow: inset 18px 0 0 var(--yellow);
}

.faq-hero {
  box-shadow: inset 18px 0 0 var(--cyan);
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 56px;
  align-items: start;
}

.article-body section {
  margin-bottom: 70px;
}

.article-body h2 {
  margin: 0 0 24px;
  padding-bottom: 12px;
  border-bottom: 3px solid var(--ink);
  font-size: clamp(1.65rem, 3vw, 2.45rem);
  line-height: 1.2;
}

.article-body h3 {
  margin: 0 0 8px;
  font-size: 1.15rem;
}

.article-body p {
  margin: 0 0 16px;
  color: #44413c;
}

.side-nav {
  position: sticky;
  top: 102px;
  padding: 22px;
  background: var(--yellow);
  border: 2px solid var(--ink);
  box-shadow: 5px 5px 0 var(--ink);
}

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

.side-nav a {
  padding: 8px 0;
  display: block;
  border-top: 1px solid var(--ink);
  font-size: 0.88rem;
  font-weight: 800;
}

.step-list {
  counter-reset: guide-step;
  display: grid;
  gap: 18px;
}

.step-card {
  counter-increment: guide-step;
  padding: 26px 26px 26px 90px;
  position: relative;
  background: var(--white);
  border: 2px solid var(--ink);
}

.step-card::before {
  content: counter(guide-step, decimal-leading-zero);
  position: absolute;
  top: 24px;
  left: 22px;
  color: var(--coral);
  font-size: 1.7rem;
  font-weight: 900;
}

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

.notice {
  margin: 22px 0;
  padding: 20px 22px;
  background: #e1f8fa;
  border: 2px solid var(--ink);
  border-left: 10px solid var(--cyan);
}

.notice strong {
  display: block;
  margin-bottom: 4px;
}

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

.check-list li {
  padding: 16px 16px 16px 46px;
  position: relative;
  background: var(--white);
  border: 2px solid var(--ink);
}

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

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

.mini-shot-row figure {
  margin: 0;
}

.mini-shot-row .app-shot {
  max-width: 320px;
}

.mini-shot-row figcaption {
  padding-top: 12px;
  font-size: 0.83rem;
  font-weight: 800;
}

.function-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--white);
}

.function-table th,
.function-table td {
  padding: 15px;
  border: 2px solid var(--ink);
  text-align: left;
  vertical-align: top;
}

.function-table th {
  background: var(--yellow);
}

.function-table td:first-child {
  width: 24%;
  font-weight: 900;
}

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

.topic-card {
  padding: 22px;
  background: var(--white);
  border: 2px solid var(--ink);
}

.topic-card:nth-child(2n) {
  border-top: 8px solid var(--cyan);
}

.topic-card:nth-child(2n + 1) {
  border-top: 8px solid var(--coral);
}

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

.article-faq details {
  background: transparent;
}

.article-faq .faq-answer {
  padding-right: 8px;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 300;
  padding: 28px;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(23, 23, 23, 0.92);
}

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

.lightbox img {
  width: auto;
  max-width: min(400px, 88vw);
  max-height: 84vh;
  border: 3px solid var(--white);
  border-radius: 10px;
}

.lightbox-close {
  position: absolute;
  top: 22px;
  right: 22px;
  width: 48px;
  height: 48px;
  color: var(--ink);
  background: var(--yellow);
  border: 2px solid var(--white);
  border-radius: 50%;
  font-size: 1.6rem;
  font-weight: 900;
  cursor: pointer;
}

@media (max-width: 980px) {
  .nav-links {
    position: fixed;
    inset: 74px 0 0;
    padding: 26px 24px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    background: var(--paper);
    border-top: 3px solid var(--ink);
  }

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

  .nav-links a {
    min-height: 52px;
    border-bottom: 2px solid var(--ink);
  }

  .menu-toggle {
    display: inline-flex;
  }

  .nav-download {
    margin-left: auto;
  }

  .hero-copy {
    width: min(620px, 70%);
  }

  .hero-shot {
    width: 225px;
  }

  .hero-shot-one {
    right: 15%;
  }

  .hero-shot-two {
    right: -5%;
  }

  .hero-shot-three {
    right: 5%;
  }

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

  .fact:nth-child(3) {
    border-left: 2px solid var(--ink);
    border-top: 2px solid var(--ink);
  }

  .fact:nth-child(4) {
    border-top: 2px solid var(--ink);
  }

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

  .process-item:nth-child(n + 3) {
    border-top: 2px solid var(--ink);
  }

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

  .gallery-track {
    grid-auto-columns: minmax(230px, 42%);
  }

  .review-grid {
    grid-template-columns: 0.8fr 1fr;
  }

  .review-card:last-child {
    grid-column: 1 / -1;
  }

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

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

@media (max-width: 700px) {
  .nav-wrap {
    width: min(100% - 20px, 1180px);
  }

  .brand span {
    font-size: 1rem;
  }

  .nav-download {
    display: none;
  }

  .container {
    width: min(100% - 24px, 1120px);
  }

  .hero,
  .hero-inner {
    min-height: 720px;
  }

  .hero::after {
    width: 24%;
  }

  .hero-inner {
    align-items: flex-start;
  }

  .hero-copy {
    width: calc(100% - 12px);
    margin: 34px 0 0;
    padding: 28px 22px;
  }

  .hero h1 {
    font-size: clamp(2.55rem, 13vw, 4rem);
  }

  .hero-shot {
    width: 150px;
  }

  .hero-shot-one {
    top: 465px;
    right: auto;
    left: 7%;
  }

  .hero-shot-two {
    top: 440px;
    right: 8%;
  }

  .hero-shot-three {
    display: none;
  }

  .facts,
  .process-grid,
  .feature-grid,
  .content-links,
  .review-grid,
  .download-band-inner,
  .footer-grid,
  .check-list,
  .mini-shot-row,
  .topic-grid {
    grid-template-columns: 1fr;
  }

  .fact,
  .fact:last-child {
    border-right: 2px solid var(--ink);
    border-bottom: 2px solid var(--ink);
  }

  .fact:last-child {
    border-bottom: 0;
  }

  .fact:nth-child(3),
  .fact:nth-child(4) {
    border-top: 0;
  }

  .process-item,
  .process-item:nth-child(2) {
    border-right: 0;
    border-bottom: 2px solid var(--ink);
  }

  .process-item:nth-child(n + 3) {
    border-top: 0;
  }

  .process-item:last-child {
    border-bottom: 0;
  }

  .section {
    padding: 64px 0;
  }

  .section-heading {
    align-items: flex-start;
  }

  .section-index {
    width: 46px;
    height: 46px;
  }

  .gallery-track {
    grid-auto-columns: minmax(225px, 78%);
  }

  .review-card:last-child {
    grid-column: auto;
  }

  .footer-links {
    justify-content: flex-start;
  }

  .page-hero {
    padding: 70px 0 58px;
  }

  .page-hero h1 {
    font-size: 2.25rem;
    line-height: 1.14;
  }

  .guide-hero,
  .faq-hero {
    box-shadow: inset 9px 0 0 var(--yellow);
  }

  .faq-hero {
    box-shadow: inset 9px 0 0 var(--cyan);
  }

  .step-card {
    padding: 74px 20px 22px;
  }

  .step-card::before {
    top: 18px;
    left: 20px;
  }

  .function-table,
  .function-table tbody,
  .function-table tr,
  .function-table th,
  .function-table td {
    display: block;
  }

  .function-table thead {
    display: none;
  }

  .function-table tr {
    margin-bottom: 14px;
    border: 2px solid var(--ink);
  }

  .function-table td {
    border: 0;
    border-bottom: 1px solid var(--ink);
  }

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

  .function-table td:first-child {
    width: auto;
    background: var(--yellow);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}