/* 官网复用 AppTheme.paper；其他主题色仅用于展示 App 的真实主题选项。 */
:root {
  color-scheme: light;
  --paper: #faf7f2;
  --surface: #fff;
  --ink: #35372a;
  --secondary: #817a6f;
  --muted: #6f6a60;
  --accent: #b78062;
  --green: #66856c;
  --line: #e9e2d8;
  --soft: #f1eae0;
  --peach: #e9d9ca;
  --screen-border: #514d42;
  --shadow: 43, 36, 23;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --wrap: 1240px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 100px; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.7 var(--font); -webkit-font-smoothing: antialiased; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
svg { display: block; width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }
figure, p, h1, h2, h3, dl, dd { margin: 0; }
button { cursor: pointer; }
[hidden] { display: none !important; }
::selection { background: var(--peach); color: var(--ink); }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 6px; }
.wrap { width: min(var(--wrap), calc(100% - 112px)); margin-inline: auto; }
.section-space { padding-block: 112px; }
.eyebrow { display: flex; align-items: center; gap: 13px; font-size: 13px; font-weight: 500; letter-spacing: .12em; color: var(--muted); }
.eyebrow-line { width: 28px; height: 1px; background: var(--accent); }
h1, h2 { font-weight: 550; letter-spacing: -.055em; text-wrap: balance; }
h2 { font-size: clamp(34px, 3.5vw, 48px); line-height: 1.5; }
.skip-link { position: fixed; z-index: 30; left: 20px; top: 12px; padding: 9px 20px; border-radius: 99px; background: var(--ink); color: var(--paper); transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }

.site-header { position: relative; z-index: 10; }
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 112px; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 9px; font-size: 25px; font-weight: 650; letter-spacing: .04em; }
.brand img { border-radius: 11px; }
.main-nav { display: flex; align-items: center; gap: 36px; font-size: 14px; }
.main-nav a { transition: color .2s; }
.main-nav a:hover { color: var(--accent); }
.main-nav .nav-cta { display: flex; align-items: center; justify-content: center; gap: 24px; min-height: 44px; padding: 8px 20px; border: 1px solid var(--line); border-radius: 30px; }
.nav-cta span { font-size: 19px; }

.hero { position: relative; display: grid; grid-template-columns: 1.15fr 1fr; align-items: center; gap: 56px; padding-top: 35px; padding-bottom: 80px; }
.hero-copy { position: relative; z-index: 1; min-width: 0; padding-bottom: 12px; }
.hero h1 { margin-top: 28px; font-size: clamp(48px, 5.25vw, 74px); line-height: 1.35; white-space: nowrap; }
.accent-word { color: var(--accent); }
.hero-description { margin-top: 30px; font-size: 18px; line-height: 1.9; color: var(--muted); letter-spacing: .025em; }
.platform-links { display: flex; gap: 12px; margin-top: 39px; }
.platform-link { display: flex; align-items: center; gap: 12px; min-width: 182px; min-height: 73px; padding: 14px 18px; border: 1px solid var(--line); border-radius: 15px; transition: transform .2s, border-color .2s, background .2s; }
.platform-link:hover { transform: translateY(-3px); border-color: var(--ink); }
.platform-link > span:not(.platform-arrow) { display: grid; line-height: 1.5; }
.platform-link strong { font-size: 15px; font-weight: 550; }
.platform-link span span { font-size: 12px; color: var(--muted); }
.platform-arrow { margin-left: auto; align-self: flex-start; font-size: 18px; line-height: 1; }
.platform-link-primary { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.platform-link-primary span span { color: var(--paper); opacity: .8; }
.text-link { display: inline-flex; align-items: center; gap: 26px; font-size: 13px; color: var(--muted); }
.text-link:hover { color: var(--ink); }
.hero-discover { margin-top: 35px; }
.hero-discover span { font-size: 18px; }
.hero-visual { position: relative; display: grid; min-width: 0; grid-template-columns: minmax(0, 1fr); place-items: center; padding-block: 24px 0; isolation: isolate; }
.hero-orbit { position: absolute; z-index: -1; width: 105%; aspect-ratio: 1; top: 16%; border: 1px solid var(--peach); border-radius: 50%; background: radial-gradient(ellipse at center, var(--peach), transparent 69%); opacity: .8; }
.hero-orbit::before { content: ""; position: absolute; inset: 24px; border: 1px solid var(--line); border-radius: 50%; }
.screenshot-frame { position: relative; overflow: hidden; background: var(--paper); border: 5px solid var(--screen-border); box-shadow: 0 26px 48px -24px rgba(var(--shadow), .4), 0 2px 4px rgba(var(--shadow), .12); }
.hero-phone { width: min(100%, 290px); border-radius: 38px; transform: rotate(5deg); }
.hero-note { position: absolute; z-index: 1; display: flex; align-items: center; gap: 10px; font-size: 12px; letter-spacing: .12em; color: var(--muted); }
.hero-note span { display: block; font-size: 28px; line-height: 1; color: var(--accent); }
.note-top { top: 16%; right: -6px; }
.note-bottom { bottom: 12%; left: -6px; }
.hero-visual figcaption { margin-top: 31px; font-size: 11px; color: var(--muted); letter-spacing: .06em; }
.intro-line { display: flex; align-items: center; justify-content: center; gap: 35px; padding-block: 27px; border-block: 1px solid var(--line); font-size: 14px; color: var(--muted); letter-spacing: .08em; }
.intro-dot { width: 3px; height: 3px; border-radius: 50%; background: var(--accent); }

.learning-section { display: grid; grid-template-columns: .95fr 1fr; align-items: center; gap: 90px; }
.learning-copy > h2 { margin-top: 20px; }
.feature-tabs { margin-top: 40px; }
.feature-tab { display: flex; gap: 19px; align-items: flex-start; width: 100%; min-height: 77px; padding: 23px 0; border: 0; border-bottom: 1px solid var(--line); background: transparent; text-align: left; }
.feature-number { padding-top: 1px; font-size: 12px; line-height: 2; color: var(--muted); font-variant-numeric: tabular-nums; }
.feature-copy { flex: 1; }
.feature-copy strong { display: block; font-size: 17px; font-weight: 500; line-height: 1.5; }
.feature-description { display: none; padding-top: 13px; color: var(--muted); font-size: 14px; line-height: 1.9; }
.feature-mark { margin-left: auto; font-size: 19px; line-height: 1.3; color: var(--muted); }
.feature-tab[aria-selected="true"] { border-bottom-color: var(--accent); }
.feature-tab[aria-selected="true"] .feature-number, .feature-tab[aria-selected="true"] .feature-mark { color: var(--accent); }
.feature-tab[aria-selected="true"] .feature-description { display: block; }
.feature-tab:hover .feature-copy strong { color: var(--accent); }
.feature-stage { position: relative; display: grid; place-items: center; min-width: 0; min-height: 740px; background: var(--soft); border-radius: 180px 180px 22px 22px; overflow: hidden; }
.stage-decoration { position: absolute; width: 440px; height: 440px; border: 1px solid var(--line); border-radius: 50%; top: 200px; left: -180px; }
.stage-decoration::after { content: ""; position: absolute; inset: 28px; border: 1px solid var(--line); border-radius: inherit; }
.feature-panel { position: relative; min-width: 0; width: 100%; padding: 40px 28px 25px; }
.feature-panel figure { display: grid; grid-template-columns: minmax(0, 1fr); justify-items: center; }
.feature-phone { width: 270px; max-width: 100%; border-radius: 34px; }
.feature-tablet { width: 390px; max-width: 100%; border-radius: 28px; }
.feature-panel figcaption { margin-top: 24px; text-align: center; font-size: 12px; color: var(--muted); }

.everyday-section { background: var(--soft); overflow: hidden; }
.everyday-inner { display: grid; grid-template-columns: 1fr 1.15fr; align-items: center; gap: 120px; }
.library-visual { position: relative; display: grid; place-items: center; min-height: 540px; }
.library-circle { position: absolute; width: 390px; aspect-ratio: 1; border: 1px solid var(--peach); border-radius: 50%; background: var(--paper); }
.library-phone { width: 246px; border-radius: 32px; transform: rotate(-6deg); }
.everyday-copy h2 { margin-top: 20px; font-size: clamp(32px, 3.15vw, 43px); }
.everyday-list { margin-top: 30px; }
.everyday-list > div { display: grid; grid-template-columns: 105px 1fr; gap: 15px; padding-block: 19px; border-bottom: 1px solid var(--line); }
.everyday-list dt { font-size: 15px; font-weight: 550; }
.everyday-list dd { font-size: 14px; color: var(--muted); }
.theme-line { display: flex; align-items: center; gap: 22px; margin-top: 32px; color: var(--muted); font-size: 12px; }
.theme-line > span { display: flex; align-items: center; gap: 8px; }
.theme-swatch { display: inline-block; width: 13px; height: 13px; border-radius: 50%; border: 1px solid rgba(var(--shadow), .12); }
.swatch-paper { background: #b78062; }
.swatch-forest { background: #557a60; }
.swatch-ocean { background: #4e819a; }
.swatch-dusk { background: #9a7199; }

.platform-section { display: flex; flex-direction: column; align-items: center; text-align: center; }
.closing-icon { border-radius: 21px; margin-bottom: 26px; }
.platform-section h2 { margin-top: 20px; }
.platform-statuses { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; width: min(100%, 560px); margin-top: 40px; }
.platform-status { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; padding: 25px; border: 1px solid var(--line); border-radius: 18px; text-align: left; scroll-margin-top: 30px; transition: background .3s, border-color .3s; }
.platform-status:target { background: var(--soft); border-color: var(--accent); }
.platform-status h3 { font-size: 17px; font-weight: 550; }
.platform-status p { display: flex; align-items: center; gap: 8px; width: 100%; padding-left: 36px; font-size: 13px; color: var(--muted); }
.status-dot { width: 5px; height: 5px; background: var(--accent); border-radius: 50%; }
.site-footer { display: flex; align-items: center; gap: 28px; min-height: 112px; border-top: 1px solid var(--line); font-size: 12px; color: var(--muted); }
.footer-brand { font-size: 18px; color: var(--ink); }
.footer-brand img { border-radius: 8px; }
.site-footer nav { display: flex; gap: 28px; margin-left: auto; }
.site-footer nav a:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 5px; }

@media (min-width: 1500px) {
  .hero { padding-top: 60px; }
  .hero-phone { width: 310px; }
  .hero { padding-bottom: 100px; }
}
@media (max-width: 1120px) {
  .wrap { width: calc(100% - 72px); }
  .hero { gap: 24px; }
  .hero h1 { font-size: 5.5vw; }
  .hero-phone { width: 250px; border-radius: 34px; }
  .hero-note { display: none; }
  .platform-link { min-width: 164px; padding-inline: 14px; }
  .learning-section { gap: 50px; }
  .feature-stage { min-height: 680px; }
  .feature-phone { width: 245px; }
  .everyday-inner { gap: 60px; }
  .everyday-list > div { grid-template-columns: 86px 1fr; gap: 12px; }
}
@media (max-width: 820px) {
  html { scroll-padding-top: 32px; }
  .wrap { width: calc(100% - 48px); }
  .section-space { padding-block: 80px; }
  .header-inner { min-height: 88px; }
  .brand { font-size: 23px; }
  .brand img { width: 40px; height: 40px; }
  .main-nav { gap: 20px; font-size: 13px; }
  .main-nav a:nth-child(2) { display: none; }
  .main-nav .nav-cta { padding-inline: 16px; gap: 14px; }
  .hero { grid-template-columns: 1fr; gap: 45px; padding-block: 40px 55px; text-align: center; }
  .hero-copy { padding: 0; }
  .hero .eyebrow, .platform-links, .hero-discover { justify-content: center; }
  .hero h1 { font-size: clamp(43px, 7.7vw, 64px); margin-top: 25px; }
  .hero-description { margin-top: 25px; font-size: 16px; }
  .platform-links { margin-top: 30px; }
  .platform-link { min-width: 176px; text-align: left; }
  .hero-discover { margin-top: 26px; }
  .hero-visual { width: min(100%, 470px); margin-inline: auto; padding-top: 12px; }
  .hero-phone { width: 255px; transform: rotate(4deg); }
  .hero-orbit { width: 94%; top: 14%; }
  .hero-note { display: flex; }
  .note-top { right: -2px; }
  .note-bottom { left: -2px; }
  .intro-line { gap: 23px; font-size: 12px; letter-spacing: .02em; padding-block: 23px; }
  .learning-section { grid-template-columns: 1fr 1fr; gap: 32px; }
  .learning-copy h2 { font-size: 32px; }
  .feature-tabs { margin-top: 25px; }
  .feature-tab { gap: 11px; padding-block: 20px; }
  .feature-copy strong { font-size: 14px; }
  .feature-description { font-size: 12px; }
  .feature-description br { display: none; }
  .feature-mark { display: none; }
  .feature-stage { min-height: 600px; border-radius: 140px 140px 20px 20px; }
  .feature-panel { padding-inline: 20px; }
  .feature-phone { width: 225px; border-radius: 29px; border-width: 4px; }
  .feature-tablet { border-radius: 24px; border-width: 4px; }
  .feature-panel figcaption { font-size: 11px; }
  .everyday-inner { gap: 35px; }
  .library-phone { width: 210px; border-radius: 29px; }
  .library-visual { min-height: 480px; }
  .library-circle { width: 300px; }
  .everyday-copy h2 { font-size: 30px; }
  .everyday-list > div { display: block; padding-block: 15px; }
  .everyday-list dd { margin-top: 5px; font-size: 13px; }
  .theme-line { gap: 13px; flex-wrap: wrap; }
}
@media (max-width: 600px) {
  .wrap { width: calc(100% - 40px); }
  .section-space { padding-block: 65px; }
  .header-inner { min-height: 82px; gap: 14px; }
  .brand { font-size: 22px; gap: 6px; }
  .main-nav { gap: 15px; font-size: 12px; }
  .main-nav .nav-cta { min-height: 40px; padding: 7px 12px; gap: 10px; }
  .hero { padding-top: 36px; gap: 35px; }
  .hero .eyebrow { font-size: 11px; letter-spacing: .08em; }
  .hero h1 { font-size: clamp(33px, 8.9vw, 51px); line-height: 1.5; letter-spacing: -.065em; }
  .hero-description { font-size: 15px; line-height: 1.9; margin-top: 20px; }
  .platform-links { gap: 10px; }
  .platform-link { min-width: 0; min-height: 70px; width: 168px; gap: 9px; padding: 12px 13px; border-radius: 13px; }
  .platform-link svg { width: 21px; height: 21px; }
  .platform-link strong { font-size: 14px; }
  .platform-link span span { font-size: 11px; }
  .platform-arrow { font-size: 16px; }
  .hero-discover { font-size: 12px; }
  .hero-phone { width: 237px; border-radius: 32px; border-width: 4px; }
  .hero-visual { max-width: 350px; }
  .hero-visual figcaption { margin-top: 26px; }
  .hero-note { font-size: 10px; gap: 6px; letter-spacing: .06em; }
  .hero-note span { font-size: 24px; }
  .note-top { right: -5px; }
  .note-bottom { left: -5px; bottom: 13%; }
  .intro-line { gap: 13px; font-size: 11px; letter-spacing: 0; }
  .intro-dot { width: 2px; height: 2px; }
  .learning-section { grid-template-columns: 1fr; gap: 36px; }
  .eyebrow { font-size: 11px; }
  .learning-copy h2 { margin-top: 17px; font-size: 34px; }
  .feature-tabs { margin-top: 26px; }
  .feature-tab { gap: 18px; padding-block: 20px; min-height: 67px; }
  .feature-copy strong { font-size: 16px; }
  .feature-description { font-size: 13px; }
  .feature-mark { display: block; }
  .feature-stage { min-height: 630px; border-radius: 150px 150px 18px 18px; }
  .feature-panel { padding: 38px 28px 26px; }
  .feature-phone { width: 238px; border-radius: 30px; }
  .feature-tablet { width: 300px; }
  .everyday-inner { grid-template-columns: 1fr; gap: 45px; }
  .everyday-copy { grid-row: 1; }
  .everyday-copy h2 { font-size: 32px; }
  .everyday-list { margin-top: 23px; }
  .everyday-list > div { display: grid; grid-template-columns: 88px 1fr; gap: 14px; padding-block: 18px; }
  .everyday-list dt { font-size: 14px; }
  .everyday-list dd { margin-top: 0; font-size: 13px; }
  .theme-line { justify-content: space-between; gap: 12px; font-size: 11px; margin-top: 26px; }
  .library-visual { min-height: 470px; }
  .library-phone { width: 212px; }
  .library-circle { width: 320px; max-width: 95%; }
  .platform-section h2 { font-size: 32px; }
  .closing-icon { width: 65px; height: 65px; border-radius: 18px; margin-bottom: 22px; }
  .platform-statuses { gap: 12px; margin-top: 30px; }
  .platform-status { padding: 21px 16px; gap: 9px; border-radius: 15px; }
  .platform-status svg { width: 21px; height: 21px; }
  .platform-status h3 { font-size: 15px; }
  .platform-status p { padding-left: 30px; font-size: 11px; }
  .site-footer { flex-wrap: wrap; justify-content: space-between; gap: 13px; padding-block: 25px; min-height: 0; font-size: 11px; }
  .footer-brand { font-size: 17px; }
  .footer-brand img { width: 30px; height: 30px; }
  .site-footer nav { width: 100%; margin-left: 0; justify-content: flex-end; gap: 20px; }
}
@media (max-width: 360px) {
  .wrap { width: calc(100% - 32px); }
  .main-nav > a:first-child { display: none; }
  .hero-note { display: none; }
  .platform-link { padding-inline: 10px; gap: 6px; }
  .feature-copy strong { font-size: 15px; }
  .feature-number { font-size: 11px; }
  .feature-tab { gap: 13px; }
  .intro-line { gap: 10px; font-size: 10px; }
  .everyday-copy h2, .platform-section h2 { font-size: 29px; }
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --paper: #1c1c1a;
    --surface: #292925;
    --ink: #eeeadf;
    --secondary: #b7b1a5;
    --muted: #b7b1a5;
    --accent: #dbaa8d;
    --green: #98ba98;
    --line: #3b3b33;
    --soft: #25251f;
    --peach: #493a30;
    --screen-border: #726d62;
    --shadow: 0, 0, 0;
  }
  .brand img, .closing-icon { opacity: .9; }
  .screenshot-frame { background: #faf7f2; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .platform-link:hover { transform: none; }
}