:root {
  color-scheme: light;
  --page: #f4ead9;
  --paper: rgba(255, 251, 242, 0.76);
  --paper-strong: #fffaf0;
  --ink: #2b201a;
  --muted: #75685b;
  --line: rgba(82, 61, 45, 0.19);
  --line-strong: rgba(82, 61, 45, 0.28);
  --accent: #8e2f3a;
  --accent-dark: #69202a;
  --accent-soft: #c86d58;
  --grid-small: rgba(95, 72, 54, 0.038);
  --grid-large: rgba(95, 72, 54, 0.052);
  --shadow: 0 24px 65px rgba(81, 56, 33, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--page);
  color: var(--ink);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

h1[id],
h2[id],
section[id] {
  scroll-margin-top: 7rem;
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background:
    linear-gradient(var(--grid-large) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-large) 1px, transparent 1px),
    linear-gradient(var(--grid-small) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-small) 1px, transparent 1px),
    radial-gradient(circle at 92% 8%, rgba(202, 109, 88, 0.14), transparent 30rem),
    radial-gradient(circle at 7% 34%, rgba(224, 164, 89, 0.12), transparent 24rem),
    var(--page);
  background-attachment: fixed;
  background-size:
    120px 120px,
    120px 120px,
    24px 24px,
    24px 24px,
    auto,
    auto,
    auto;
}

a {
  color: inherit;
}

a:focus-visible,
summary:focus-visible,
label:focus-visible {
  border-radius: 0.25rem;
  outline: 3px solid color-mix(in srgb, var(--accent) 46%, transparent);
  outline-offset: 4px;
}

.language-control {
  position: fixed;
  inline-size: 1px;
  block-size: 1px;
  opacity: 0.001;
}

.site-footer,
main {
  width: min(100% - 2.5rem, 70rem);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  width: 100%;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--page) 88%, transparent);
  backdrop-filter: blur(18px) saturate(1.05);
  -webkit-backdrop-filter: blur(18px) saturate(1.05);
}

.header-inner {
  display: flex;
  width: min(100% - 2.5rem, 70rem);
  min-height: 6.6rem;
  margin-inline: auto;
  align-items: center;
  gap: clamp(1rem, 3vw, 2rem);
}

.brand-link {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  gap: 0.8rem;
  flex: 0 0 auto;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.brand-icon {
  display: block;
  width: 4.3rem;
  height: auto;
}

.site-nav {
  display: none;
  margin-inline-start: auto;
  align-items: center;
  gap: clamp(0.85rem, 2.2vw, 1.55rem);
}

#language-en:checked ~ .site-header .site-nav-en,
#language-zh-cn:checked ~ .site-header .site-nav-zh-cn {
  display: flex;
}

.site-nav a {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 620;
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--accent);
}

.language-picker {
  display: inline-grid;
  min-height: 2.75rem;
  padding: 0.18rem;
  grid-template-columns: repeat(2, 1fr);
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: rgba(255, 251, 242, 0.5);
}

.language-picker label {
  display: inline-flex;
  min-height: 2.3rem;
  padding-inline: 0.72rem;
  align-items: center;
  justify-content: center;
  border-radius: 0.36rem;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.76rem;
  font-weight: 700;
}

#language-en:checked ~ .site-header label[for="language-en"],
#language-zh-cn:checked ~ .site-header label[for="language-zh-cn"] {
  color: #fff9ef;
  background: var(--accent);
}

#language-en:focus-visible ~ .site-header label[for="language-en"],
#language-zh-cn:focus-visible ~ .site-header label[for="language-zh-cn"] {
  outline: 3px solid color-mix(in srgb, var(--accent) 46%, transparent);
  outline-offset: 4px;
}

.support-page {
  display: none;
}

#language-en:checked ~ main .language-en,
#language-zh-cn:checked ~ main .language-zh-cn {
  display: block;
}

.hero {
  display: grid;
  min-height: 34rem;
  padding-block: clamp(3rem, 6vw, 4.25rem);
  align-items: center;
  gap: clamp(3rem, 8vw, 6rem);
  grid-template-columns: minmax(0, 1.15fr) minmax(18rem, 0.85fr);
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 820;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  text-wrap: pretty;
}

h1,
h2 {
  font-family: Georgia, "Times New Roman", serif;
}

h1 {
  max-width: 15ch;
  margin: 0;
  font-size: clamp(3rem, 5vw, 4.6rem);
  font-weight: 680;
  letter-spacing: -0.055em;
  line-height: 0.98;
}

.language-zh-cn h1 {
  max-width: 12ch;
  letter-spacing: -0.045em;
  line-height: 1.04;
}

.hero-summary {
  max-width: 34rem;
  margin: 1.45rem 0 0;
  color: var(--muted);
  font-size: clamp(1.04rem, 1.8vw, 1.18rem);
  line-height: 1.55;
}

.app-icon-stage {
  position: relative;
  display: grid;
  min-height: 27rem;
  margin: 0;
  place-items: center;
  isolation: isolate;
}

.app-icon-blueprint {
  position: absolute;
  z-index: -1;
  width: min(100%, 22.5rem);
  aspect-ratio: 1;
  border: 1px solid rgba(82, 61, 45, 0.18);
  border-radius: 24%;
  rotate: -7deg;
}

.app-icon-blueprint::before,
.app-icon-blueprint::after {
  position: absolute;
  inset: 13%;
  border: 1px solid rgba(82, 61, 45, 0.14);
  border-radius: 50%;
  content: "";
}

.app-icon-blueprint::after {
  inset: 0 50%;
  border-block: 0;
  border-radius: 0;
}

.app-icon {
  display: block;
  width: min(78%, 19.5rem);
  height: auto;
  aspect-ratio: 1;
  border-radius: 22.5%;
  box-shadow:
    0 2.2rem 4rem rgba(96, 54, 30, 0.2),
    0 0 0 1px rgba(82, 61, 45, 0.1);
  rotate: 3deg;
}

.screenshot-showcase {
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
  border-bottom: 1px solid var(--line);
}

.screenshot-strip {
  display: grid;
  overflow: hidden;
  gap: 0;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: var(--paper);
  box-shadow: 0 12px 28px rgba(81, 56, 33, 0.08);
}

.app-store-screenshot-item {
  min-width: 0;
}

.app-store-screenshot-item img {
  display: block;
  width: 100%;
  height: auto;
}

.content-section {
  display: grid;
  padding-block: clamp(4.8rem, 10vw, 8rem);
  column-gap: clamp(2.5rem, 8vw, 7rem);
  grid-template-columns: minmax(17rem, 0.78fr) minmax(0, 1.22fr);
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 7rem;
}

.section-heading {
  grid-column: 1;
  align-self: start;
}

.section-number {
  display: inline-flex;
  min-width: 2.3rem;
  min-height: 2.3rem;
  margin: 0 0 1.4rem;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-strong);
  border-radius: 0.45rem;
  color: var(--accent);
  font-size: 0.68rem;
  font-weight: 820;
  letter-spacing: 0.06em;
}

h2 {
  max-width: 12ch;
  margin: 0;
  font-size: clamp(2.5rem, 4.7vw, 4rem);
  font-weight: 680;
  letter-spacing: -0.045em;
  line-height: 1.02;
}

.language-zh-cn h2 {
  max-width: 9ch;
  line-height: 1.08;
}

h3 {
  margin: 0;
  font-size: 1.12rem;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.intro-grid,
.instruction-grid,
.music-requirement-card,
.faq-list {
  grid-column: 2;
}

.intro-grid {
  display: grid;
  align-content: start;
  gap: 2rem;
}

.lead-card {
  padding: 0 0 1.7rem;
  border-bottom: 1px solid var(--line);
}

.lead {
  margin: 0;
  font-size: clamp(1.3rem, 2.3vw, 1.65rem);
  font-weight: 620;
  letter-spacing: -0.025em;
  line-height: 1.42;
}

.lead-card > p:last-child {
  margin: 1rem 0 0;
  color: var(--muted);
}

.requirements-list {
  display: grid;
  margin: 0;
  padding: 0;
  gap: 0.8rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  list-style: none;
}

.requirements-list li {
  display: flex;
  min-height: 7.2rem;
  padding: 1.15rem;
  justify-content: space-between;
  gap: 1rem;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: var(--paper);
  box-shadow: 0 9px 24px rgba(81, 56, 33, 0.045);
}

.requirement-label {
  color: var(--accent);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.requirements-list strong {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.18rem;
  line-height: 1.2;
}

.section-note {
  grid-column: 2;
  margin: 2rem 0 0;
  padding: 1.05rem 0 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
}

.music-requirement-card {
  display: grid;
  padding: clamp(1.5rem, 4vw, 2.4rem);
  align-content: start;
  gap: 1.5rem;
  grid-template-columns: auto minmax(0, 1fr);
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: var(--paper);
  box-shadow: 0 12px 32px rgba(81, 56, 33, 0.06);
}

.music-badge {
  display: block;
  width: 3.8rem;
  aspect-ratio: 1;
}

.music-badge img {
  display: block;
  width: 100%;
  height: auto;
}

.music-requirement-card ul {
  margin: 1.25rem 0 0;
  padding-left: 1.15rem;
  color: var(--muted);
}

.music-requirement-card li + li {
  margin-top: 0.7rem;
}

.faq-list {
  overflow: hidden;
  align-self: start;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: var(--paper);
  box-shadow: 0 12px 32px rgba(81, 56, 33, 0.055);
}

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

.faq-list details:last-child {
  border-bottom: 0;
}

.faq-list summary {
  position: relative;
  min-height: 4.2rem;
  padding: 1.3rem 3.6rem 1.3rem 1.45rem;
  cursor: pointer;
  font-weight: 740;
  list-style: none;
}

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

.faq-list summary::after {
  position: absolute;
  top: 50%;
  right: 1.2rem;
  width: 1.7rem;
  height: 1.7rem;
  border: 1px solid var(--line-strong);
  border-radius: 0.4rem;
  color: var(--accent);
  content: "+";
  line-height: 1.56rem;
  text-align: center;
  translate: 0 -50%;
}

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

.faq-list details p {
  max-width: 70ch;
  margin: 0;
  padding: 0 3.6rem 1.35rem 1.45rem;
  color: var(--muted);
}

.instruction-grid {
  display: grid;
  align-self: start;
  gap: 0.8rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.instruction-card {
  padding: clamp(1.4rem, 3vw, 2rem);
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: var(--paper);
  box-shadow: 0 12px 32px rgba(81, 56, 33, 0.055);
}

.instruction-card ol {
  margin: 1.15rem 0 0;
  padding-left: 1.25rem;
}

.instruction-card li + li {
  margin-top: 0.7rem;
}

.instruction-card p {
  margin: 1.1rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.text-link {
  display: inline-flex;
  min-height: 2.75rem;
  margin-top: 1.2rem;
  align-items: center;
  gap: 0.45rem;
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 760;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.2em;
}

.contact-section {
  display: grid;
  margin-block: clamp(4.8rem, 10vw, 8rem);
  padding-block: clamp(3rem, 7vw, 5rem);
  align-items: end;
  gap: clamp(2rem, 8vw, 7rem);
  grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.78fr);
  border-block: 1px solid var(--line);
  scroll-margin-top: 7rem;
}

.contact-section h2 {
  max-width: 11ch;
}

.contact-section p:not(.eyebrow) {
  max-width: 54ch;
  margin: 1rem 0 0;
  color: var(--muted);
}

.contact-address {
  display: flex;
  min-height: 8.2rem;
  padding: 1.35rem;
  justify-content: center;
  flex-direction: column;
  border: 1px solid var(--accent);
  border-radius: 0.55rem;
  color: #fff9ef;
  background: var(--accent);
  text-decoration: none;
  box-shadow: 0 16px 35px rgba(105, 32, 42, 0.18);
}

.contact-address span {
  color: rgba(255, 249, 239, 0.7);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.contact-address strong {
  margin-top: 0.25rem;
  color: #fff9ef;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.1rem, 2.3vw, 1.5rem);
  overflow-wrap: anywhere;
}

.legal-links {
  display: grid;
  margin-bottom: clamp(4.5rem, 9vw, 7rem);
  gap: 0.8rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.legal-links a {
  display: flex;
  min-height: 4.25rem;
  padding: 0.85rem 1.1rem;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: var(--paper);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.92rem;
  font-weight: 700;
  text-decoration: none;
}

.site-footer {
  display: flex;
  padding-block: 1.8rem 3rem;
  justify-content: space-between;
  gap: 0.75rem 2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: inherit;
  text-decoration: none;
}

@media (hover: hover) {
  .site-nav a,
  .language-picker label,
  .legal-links a,
  .contact-address,
  .text-link {
    transition:
      color 150ms ease,
      background-color 150ms ease,
      border-color 150ms ease,
      translate 150ms ease;
  }

  .legal-links a:hover {
    border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
    translate: 0 -2px;
  }

  .contact-address:hover {
    border-color: var(--accent-dark);
    background: var(--accent-dark);
    translate: 0 -2px;
  }
}

@media (max-width: 980px) {
  .site-nav {
    display: none !important;
  }

  .language-picker {
    margin-inline-start: auto;
  }
}

@media (max-width: 820px) {
  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
  }

  .app-icon-stage {
    min-height: 22rem;
  }

  .app-icon {
    width: min(68%, 17rem);
  }

  .app-icon-blueprint {
    width: min(80%, 20rem);
  }

  .content-section {
    row-gap: 2.5rem;
    grid-template-columns: 1fr;
  }

  .section-heading,
  .intro-grid,
  .instruction-grid,
  .music-requirement-card,
  .faq-list,
  .section-note {
    grid-column: 1;
  }

  h2,
  .language-zh-cn h2 {
    max-width: 15ch;
  }

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

  .screenshot-strip {
    overflow-x: auto;
    grid-template-columns: repeat(5, minmax(10.5rem, 44vw));
    scroll-snap-type: x proximity;
    scrollbar-color: var(--line-strong) transparent;
  }

  .app-store-screenshot-item {
    scroll-snap-align: start;
  }
}

@media (max-width: 640px) {
  .site-footer,
  main {
    width: min(100% - 1.35rem, 70rem);
  }

  .header-inner {
    width: min(100% - 1.35rem, 70rem);
    min-height: 5.5rem;
    gap: 0.75rem;
  }

  .brand-link span {
    display: none;
  }

  .brand-icon {
    width: 3.8rem;
  }

  .language-picker label {
    padding-inline: 0.58rem;
  }

  .hero {
    padding-block: 3.6rem 4.5rem;
  }

  h1 {
    font-size: clamp(3.1rem, 15vw, 4.2rem);
  }

  .app-icon-stage {
    min-height: 19rem;
  }

  .content-section {
    padding-block: 4.5rem;
  }

  .requirements-list,
  .instruction-grid,
  .legal-links {
    grid-template-columns: 1fr;
  }

  .music-requirement-card {
    grid-template-columns: 1fr;
  }

  .contact-section {
    padding-block: 3.5rem;
  }

  .site-footer {
    flex-direction: column;
  }
}

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

  .site-nav a,
  .language-picker label,
  .legal-links a,
  .contact-address,
  .text-link {
    transition: none;
  }
}

@media print {
  :root {
    --page: #fff;
    --paper: #fff;
    --paper-strong: #fff;
    --ink: #111;
    --muted: #444;
    --line: #ccc;
    --line-strong: #aaa;
  }

  body {
    background: #fff;
  }

  .site-header,
  .site-footer,
  .app-icon-blueprint {
    display: none;
  }

  .hero,
  .content-section,
  .contact-section {
    min-height: 0;
    padding-block: 2rem;
  }

  .requirements-list li,
  .instruction-card,
  .music-requirement-card,
  .faq-list,
  .contact-address,
  .legal-links a {
    border-color: #bbb;
    box-shadow: none;
  }
}