:root {
  --ink: #1f2226;
  --paper: #f7f4ec;
  --white: #ffffff;
  --cyan: #30c7d9;
  --cyan-dark: #137b88;
  --coral: #ff6b58;
  --yellow: #f4d35e;
  --muted: #62686d;
  --line: #cfd2cf;
  --shadow: 8px 8px 0 var(--ink);
  --radius: 6px;
}

* {
  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: 1.72;
}

body.menu-open {
  overflow: hidden;
}

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

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

button,
input {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 8px 12px;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-150%);
}

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

.container {
  width: min(1160px, calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 2px solid var(--ink);
  background: rgba(247, 244, 236, 0.96);
  backdrop-filter: blur(12px);
}

.nav-shell {
  display: flex;
  min-height: 72px;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  font-size: 21px;
  font-weight: 900;
}

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

.site-nav {
  display: flex;
  margin-left: auto;
  align-items: center;
  gap: 4px;
}

.site-nav a {
  padding: 10px 15px;
  border-bottom: 3px solid transparent;
  font-size: 14px;
  font-weight: 700;
}

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

.nav-download,
.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 10px 20px;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  color: var(--ink);
  background: var(--yellow);
  box-shadow: 4px 4px 0 var(--ink);
  font-weight: 900;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

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

.button-dark {
  color: var(--white);
  background: var(--ink);
  box-shadow: 4px 4px 0 var(--cyan);
}

.button-light {
  background: var(--white);
}

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

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  margin-left: auto;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background: var(--paper);
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 4px auto;
  background: var(--ink);
}

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 2px solid var(--ink);
}

.hero::before {
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: linear-gradient(rgba(31, 34, 38, 0.08) 1px, transparent 1px), linear-gradient(90deg, rgba(31, 34, 38, 0.08) 1px, transparent 1px);
  background-size: 32px 32px;
  content: "";
}

.hero-grid {
  display: grid;
  min-height: 650px;
  grid-template-columns: 1.08fr 0.92fr;
  align-items: center;
  gap: 64px;
  padding-block: 70px 84px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  padding: 5px 9px;
  border: 2px solid var(--ink);
  background: var(--cyan);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--coral);
  content: "";
}

.hero h1,
.page-hero h1 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(42px, 7vw, 84px);
  line-height: 1.02;
  letter-spacing: 0;
}

.hero-copy > p:not(.eyebrow) {
  max-width: 630px;
  margin: 24px 0 0;
  font-size: 18px;
  color: #454a4e;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.proof-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.proof-line li::before {
  margin-right: 7px;
  color: var(--cyan-dark);
  content: "✓";
  font-weight: 900;
}

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

.phone {
  position: absolute;
  width: min(265px, 62vw);
  padding: 10px;
  border: 3px solid var(--ink);
  border-radius: 28px;
  background: var(--ink);
  box-shadow: var(--shadow);
}

.phone img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: 18px;
}

.phone-main {
  top: 0;
  right: 54px;
  z-index: 2;
  transform: rotate(2deg);
}

.phone-back {
  top: 54px;
  left: 0;
  z-index: 1;
  transform: rotate(-7deg);
}

.burst {
  position: absolute;
  right: 0;
  bottom: 16px;
  z-index: 3;
  display: grid;
  width: 138px;
  aspect-ratio: 1;
  place-items: center;
  padding: 22px;
  border: 3px solid var(--ink);
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 5px 5px 0 var(--ink);
  font-size: 16px;
  font-weight: 900;
  text-align: center;
  transform: rotate(8deg);
}

.ticker {
  overflow: hidden;
  border-bottom: 2px solid var(--ink);
  background: var(--ink);
  color: var(--white);
}

.ticker-track {
  display: flex;
  width: max-content;
  animation: ticker 26s linear infinite;
}

.ticker-track span {
  padding: 11px 20px;
  font-size: 13px;
  font-weight: 800;
  white-space: nowrap;
}

.ticker-track span::after {
  margin-left: 38px;
  color: var(--yellow);
  content: "◆";
}

@keyframes ticker {
  to {
    transform: translateX(-50%);
  }
}

.section {
  padding-block: 88px;
  border-bottom: 2px solid var(--ink);
}

.section-cyan {
  background: #dff7f8;
}

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

.section-coral {
  background: #ffd9d2;
}

.section-head {
  display: flex;
  margin-bottom: 40px;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
}

.section-head h2,
.content-block h2 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(29px, 4vw, 48px);
  line-height: 1.14;
  letter-spacing: 0;
}

.section-index {
  flex: 0 0 auto;
  color: var(--coral);
  font-size: 54px;
  font-weight: 900;
  line-height: 1;
}

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

.feature-item {
  min-height: 250px;
  padding: 28px;
  border-right: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  background: var(--white);
}

.feature-mark {
  display: grid;
  width: 46px;
  height: 46px;
  margin-bottom: 42px;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--yellow);
  font-size: 20px;
  font-weight: 900;
}

.feature-item:nth-child(2) .feature-mark {
  background: var(--cyan);
}

.feature-item:nth-child(3) .feature-mark {
  background: var(--coral);
}

.feature-item h3 {
  margin: 0 0 9px;
  font-size: 20px;
}

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

.week-strip {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  border: 2px solid var(--ink);
  background: var(--white);
}

.day {
  min-height: 190px;
  padding: 20px 14px;
  border-right: 2px solid var(--ink);
}

.day:last-child {
  border-right: 0;
}

.day strong {
  display: block;
  margin-bottom: 30px;
  font-size: 15px;
}

.day span {
  display: block;
  margin-top: 8px;
  padding: 7px 8px;
  border-left: 5px solid var(--cyan);
  background: #edfafa;
  font-size: 12px;
  font-weight: 700;
}

.day:nth-child(2n) span {
  border-color: var(--coral);
  background: #fff0ed;
}

.day:nth-child(3n) span {
  border-color: var(--yellow);
  background: #fff9de;
}

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

.shot {
  margin: 0;
}

.shot button {
  display: block;
  width: 100%;
  padding: 0;
  border: 2px solid var(--ink);
  border-radius: 22px;
  background: var(--ink);
  box-shadow: 6px 6px 0 var(--cyan);
  cursor: zoom-in;
  overflow: hidden;
}

.shot img {
  width: 100%;
  max-width: 400px;
  height: auto;
}

.shot figcaption {
  margin-top: 16px;
  font-size: 14px;
}

.shot figcaption strong {
  display: block;
  font-size: 17px;
}

.path-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 2px solid var(--ink);
}

.path-item {
  position: relative;
  min-height: 330px;
  padding: 42px;
  background: var(--yellow);
}

.path-item + .path-item {
  border-left: 2px solid var(--ink);
  background: var(--cyan);
}

.path-item h3 {
  max-width: 380px;
  margin: 0 0 18px;
  font-size: clamp(27px, 4vw, 42px);
  line-height: 1.12;
}

.path-item p {
  max-width: 480px;
  margin: 0 0 28px;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border-bottom: 2px solid currentColor;
  font-weight: 900;
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.review-card {
  margin: 0;
  padding: 30px;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  color: var(--ink);
  background: var(--white);
}

.review-card:nth-child(2) {
  background: var(--yellow);
}

.review-card p {
  margin: 0 0 26px;
  font-size: 17px;
  font-weight: 700;
}

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

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

.faq-item {
  border-bottom: 2px solid var(--ink);
}

.faq-question {
  display: flex;
  width: 100%;
  padding: 23px 0;
  border: 0;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  color: var(--ink);
  background: transparent;
  font-size: 18px;
  font-weight: 900;
  text-align: left;
  cursor: pointer;
}

.faq-question span:last-child {
  display: grid;
  width: 30px;
  height: 30px;
  flex: 0 0 30px;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 50%;
  transition: transform 180ms ease;
}

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

.faq-answer {
  display: none;
  max-width: 860px;
  padding: 0 52px 24px 0;
  color: #4d5357;
}

.faq-answer p {
  margin: 0;
}

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

.download-band {
  padding-block: 66px;
  border-bottom: 2px solid var(--ink);
  background: var(--coral);
}

.download-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 34px;
}

.download-row h2 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(30px, 5vw, 58px);
  line-height: 1.08;
}

.download-row p,
.download-row > div > div {
  margin: 12px 0 0;
  font-weight: 700;
}

.site-footer {
  padding-block: 48px 28px;
  color: #d7d9d8;
  background: var(--ink);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 42px;
}

.footer-brand p {
  max-width: 480px;
  margin: 18px 0 0;
  color: #aeb3b4;
  font-size: 14px;
}

.footer-nav strong {
  display: block;
  margin-bottom: 12px;
  color: var(--white);
}

.footer-nav a {
  display: block;
  width: fit-content;
  margin-top: 8px;
  color: #c3c7c7;
  font-size: 14px;
}

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

.legal {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid #4d5255;
  color: #92999b;
  font-size: 12px;
}

.page-hero {
  padding-block: 76px;
  border-bottom: 2px solid var(--ink);
  background: var(--cyan);
}

.page-hero-coral {
  background: var(--coral);
}

.page-hero-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  align-items: end;
  gap: 60px;
}

.page-hero h1 {
  font-size: clamp(40px, 6vw, 70px);
}

.page-hero p {
  max-width: 760px;
  margin: 24px 0 0;
  font-size: 18px;
  font-weight: 600;
}

.hero-note {
  padding: 24px;
  border: 2px solid var(--ink);
  background: var(--white);
  box-shadow: var(--shadow);
}

.hero-note strong {
  display: block;
  margin-bottom: 8px;
  font-size: 18px;
}

.hero-note p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 74px;
  align-items: start;
}

.article-nav {
  position: sticky;
  top: 98px;
  padding: 22px;
  border: 2px solid var(--ink);
  background: var(--white);
}

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

.article-nav a {
  display: block;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.article-nav a:hover {
  color: var(--coral);
}

.steps {
  counter-reset: steps;
  border-top: 2px solid var(--ink);
}

.step {
  display: grid;
  grid-template-columns: 82px 1fr;
  gap: 26px;
  padding-block: 34px;
  border-bottom: 2px solid var(--ink);
  counter-increment: steps;
}

.step::before {
  display: grid;
  width: 62px;
  height: 62px;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--yellow);
  content: counter(steps, decimal-leading-zero);
  font-size: 18px;
  font-weight: 900;
}

.step:nth-child(2n)::before {
  background: var(--cyan);
}

.step h3 {
  margin: 0 0 8px;
  font-size: 23px;
}

.step p {
  margin: 0;
  color: #4c5155;
}

.content-block + .content-block {
  margin-top: 72px;
}

.content-block h2 {
  margin-bottom: 28px;
}

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

.check-item,
.mode-item {
  padding: 24px;
  border-right: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  background: var(--white);
}

.check-item strong,
.mode-item strong {
  display: block;
  margin-bottom: 7px;
  font-size: 18px;
}

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

.notice {
  padding: 24px 28px;
  border: 2px solid var(--ink);
  border-left: 10px solid var(--coral);
  background: #fff;
}

.notice strong {
  display: block;
  margin-bottom: 6px;
}

.notice p {
  margin: 0;
}

.feature-detail {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 34px;
  padding-block: 34px;
  border-top: 2px solid var(--ink);
}

.feature-detail:last-child {
  border-bottom: 2px solid var(--ink);
}

.feature-detail h3 {
  margin: 0;
  font-size: 22px;
}

.feature-detail p {
  margin: 0;
  color: #50565a;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  padding: 30px;
  place-items: center;
  background: rgba(16, 18, 20, 0.9);
}

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

.lightbox img {
  width: auto;
  max-width: min(400px, 84vw);
  max-height: 82vh;
  border: 3px solid var(--white);
  border-radius: 20px;
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 20px;
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border: 2px solid var(--white);
  border-radius: 50%;
  color: var(--white);
  background: transparent;
  font-size: 27px;
  cursor: pointer;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media (max-width: 920px) {
  .nav-download {
    display: none;
  }

  .hero-grid,
  .page-hero-grid {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    gap: 36px;
    padding-top: 54px;
  }

  .hero-visual {
    width: min(620px, 100%);
    min-height: 520px;
    margin-inline: auto;
  }

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

  .week-strip {
    grid-template-columns: repeat(4, 1fr);
  }

  .day:nth-child(4) {
    border-right: 0;
  }

  .day:nth-child(n + 5) {
    border-top: 2px solid var(--ink);
  }

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

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

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

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

@media (max-width: 680px) {
  .container {
    width: min(100% - 28px, 1160px);
  }

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

  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    inset: 64px 0 auto 0;
    display: none;
    padding: 18px 14px 24px;
    border-bottom: 2px solid var(--ink);
    flex-direction: column;
    align-items: stretch;
    background: var(--paper);
  }

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

  .site-nav a {
    padding: 13px 8px;
    border-bottom: 1px solid var(--line);
  }

  .hero-grid {
    min-height: auto;
    padding-block: 46px 54px;
  }

  .hero h1,
  .page-hero h1 {
    font-size: 42px;
  }

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

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

  .hero-visual {
    min-height: 420px;
  }

  .phone {
    width: 205px;
  }

  .phone-main {
    right: 12px;
  }

  .phone-back {
    top: 38px;
    left: 8px;
  }

  .burst {
    right: 2px;
    bottom: 2px;
    width: 105px;
    font-size: 13px;
  }

  .section {
    padding-block: 62px;
  }

  .section-head {
    align-items: start;
  }

  .section-index {
    font-size: 38px;
  }

  .feature-grid,
  .week-strip,
  .path-grid,
  .review-grid,
  .check-grid,
  .mode-grid {
    grid-template-columns: 1fr;
  }

  .day,
  .day:nth-child(4) {
    min-height: 0;
    border-top: 0;
    border-right: 0;
    border-bottom: 2px solid var(--ink);
  }

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

  .day strong {
    margin-bottom: 10px;
  }

  .path-item + .path-item {
    border-top: 2px solid var(--ink);
    border-left: 0;
  }

  .gallery {
    gap: 28px 14px;
  }

  .download-row {
    align-items: stretch;
    flex-direction: column;
  }

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

  .page-hero {
    padding-block: 54px;
  }

  .step {
    grid-template-columns: 58px 1fr;
    gap: 16px;
  }

  .step::before {
    width: 48px;
    height: 48px;
    font-size: 14px;
  }

  .feature-detail {
    grid-template-columns: 1fr;
    gap: 10px;
  }
}