:root{
  --paper:#f2efe6;
  --paper2:#fbfaf6;
  --ink:#1b2526;
  --muted:#65706e;
  --navy:#16333a;
  --navy2:#214b54;
  --blue:#74b8c5;
  --coral:#e97957;
  --orange:#f0a96d;
  --cream:#f4e5c5;
  --line:#d9d5ca;
  --white:#fff;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Arial,"Microsoft YaHei","PingFang SC","Helvetica Neue",sans-serif;
  color:var(--ink);
  background:var(--paper2);
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit}
.wrap{width:min(1180px,calc(100% - 40px));margin-inline:auto}
.skip-link{position:fixed;left:12px;top:-70px;z-index:999;background:#fff;padding:10px 14px;border-radius:8px;text-decoration:none}
.skip-link:focus{top:12px}

.topbar{
  position:sticky;top:0;z-index:60;
  background:rgba(242,239,230,.94);
  border-bottom:1px solid rgba(27,37,38,.09);
  backdrop-filter:blur(15px);
}
.topbar-inner{min-height:74px;display:grid;grid-template-columns:185px 1fr auto;align-items:center;gap:28px}
.logo-shell{display:inline-flex;align-items:center;min-width:max-content;text-decoration:none}
.logo-shell img{height:36px;width:auto;max-width:172px;object-fit:contain;flex-shrink:0}
.topnav{display:flex;justify-content:center;gap:24px}
.topnav a{text-decoration:none;color:#4a5755;font-size:14px}
.topnav a:hover{color:#111}
.top-cta{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:44px;padding:9px 18px;background:var(--navy);color:#fff;
  border-radius:999px;text-decoration:none;font-weight:800
}

.hero{
  background:
    linear-gradient(90deg,transparent 0 69%,rgba(22,51,58,.035) 69% 69.2%,transparent 69.2%),
    var(--paper);
  overflow:hidden;
}
.hero-grid{display:grid;grid-template-columns:.92fr 1.08fr;gap:60px;align-items:center;min-height:700px;padding:70px 0 80px}
.overline{margin:0 0 14px;color:#f2c09c;font-size:12px;font-weight:900;letter-spacing:.14em}
.overline.dark{color:#9b5b42}.overline.light{color:#f4d6a7}
.hero h1{margin:0;font-size:clamp(48px,5.5vw,75px);line-height:1.04;letter-spacing:-.055em;font-weight:900}
.hero h1 em{font-style:normal;color:var(--coral)}
.hero-lead{max-width:650px;margin:26px 0 0;color:#596462;font-size:18px}
.hero-actions{display:flex;align-items:center;gap:20px;flex-wrap:wrap;margin-top:32px}
.primary-btn,.dark-btn,.cream-btn{
  display:inline-flex;align-items:center;justify-content:center;min-height:50px;padding:12px 22px;
  border-radius:10px;text-decoration:none;font-weight:900
}
.primary-btn{background:var(--coral);color:#fff;box-shadow:0 14px 30px rgba(233,121,87,.18)}
.plain-link{text-decoration:none;font-weight:800;color:#42524f}
.hero-meta{display:grid;grid-template-columns:repeat(3,1fr);margin-top:42px;border-top:1px solid #d5d0c5}
.hero-meta>div{padding:18px 16px 0 0}
.hero-meta strong,.hero-meta span{display:block}
.hero-meta strong{font-size:14px}.hero-meta span{margin-top:3px;color:#77817f;font-size:12px}

.hero-art{position:relative}
.art-paper{
  position:relative;min-height:540px;padding:32px 36px 62px;background:#fff;
  box-shadow:0 30px 70px rgba(55,48,34,.14);transform:rotate(1.1deg)
}
.art-paper::before{content:"";position:absolute;left:-18px;top:42px;width:36px;height:190px;background:var(--coral)}
.paper-tag{display:inline-block;margin-bottom:20px;font-size:11px;font-weight:900;letter-spacing:.14em;color:#8a7770}
.art-paper img{width:100%;max-height:410px;object-fit:contain;margin:auto}
.paper-caption{position:absolute;left:36px;right:36px;bottom:22px;display:grid;grid-template-columns:44px 1fr;gap:14px;align-items:center;border-top:1px solid #e1ddd3;padding-top:14px}
.paper-caption span{font-size:25px;font-weight:900;color:var(--coral)}
.paper-caption p{margin:0;color:#68716f;font-size:13px}

.chooser{padding:92px 0;background:#fff}
.section-title-row{display:grid;grid-template-columns:1fr .8fr;gap:72px;align-items:end;margin-bottom:38px}
.section-title-row h2,.story-side h2,.iphone-copy h2,.steps-heading h2,.problem-heading h2,.related-head h2,.faq-title h2,.closing h2{
  margin:0;font-size:clamp(31px,3.3vw,46px);line-height:1.15;letter-spacing:-.04em
}
.section-title-row>p{margin:0;color:var(--muted)}
.choice-board{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--line)}
.choice{position:relative;min-height:360px;padding:42px;display:grid;grid-template-columns:75px 1fr;gap:18px}
.android-choice{background:#eaf1ef;border-right:1px solid var(--line)}
.iphone-choice{background:#f6ece1}
.choice-no{font-size:58px;line-height:1;font-weight:900;opacity:.13}
.choice-label{margin:0;color:#7b8582;font-size:11px;font-weight:900;letter-spacing:.14em}
.choice h3{margin:4px 0 12px;font-size:32px}
.choice p{color:#596461}
.choice a{display:inline-block;margin-top:16px;text-decoration:none;font-weight:900;color:#9d503b}

.android-story{padding:100px 0;background:#f0eee7}
.story-grid{display:grid;grid-template-columns:1fr .8fr;gap:90px;align-items:center}
.story-side{position:relative;padding-left:72px}
.vertical-word{position:absolute;left:0;top:4px;writing-mode:vertical-rl;transform:rotate(180deg);font-size:11px;letter-spacing:.22em;font-weight:900;color:#999184}
.story-side>p:not(.overline){color:var(--muted)}
.story-notes{display:flex;gap:9px;flex-wrap:wrap;margin:25px 0}
.story-notes span{padding:7px 11px;border:1px solid #cfc8bb;border-radius:999px;font-size:12px}
.dark-btn{background:var(--navy);color:#fff}
.device-figure{position:relative;margin:0;min-height:530px;display:flex;align-items:center;justify-content:center;padding:34px}
.device-figure img{max-height:460px;width:auto;object-fit:contain;filter:drop-shadow(0 24px 34px rgba(0,0,0,.22))}
.device-figure-a{background:#d9e4e1;border-radius:0 100px 0 0}
.device-figure-b{background:#2a5961;border-radius:0 0 0 110px}
.figure-number{position:absolute;top:18px;left:22px;font-size:36px;font-weight:900;opacity:.25}
.device-figure figcaption{position:absolute;left:28px;right:28px;bottom:18px;text-align:center;font-size:12px;color:#5e6c68}
.device-figure-b figcaption{color:#c5d8d8}

.iphone-story{padding:100px 0;background:var(--navy);color:#fff}
.iphone-grid{display:grid;grid-template-columns:.8fr 1fr;gap:90px;align-items:center}
.iphone-copy>p:not(.overline){color:#c9d8d9}
.iphone-list{margin:30px 0;border-top:1px solid rgba(255,255,255,.16)}
.iphone-list>div{display:grid;grid-template-columns:54px 1fr;gap:15px;padding:16px 0;border-bottom:1px solid rgba(255,255,255,.16)}
.iphone-list strong{color:#f1bd8f}.iphone-list span{color:#e3eded}
.cream-btn{background:var(--cream);color:#342617}

.steps-section{padding:96px 0;background:#fff}
.steps-heading{max-width:770px;margin-bottom:46px}
.steps-heading>p:last-child{color:var(--muted)}
.step-track{display:grid;grid-template-columns:repeat(4,1fr);border-top:2px solid var(--ink)}
.step-track article{min-height:270px;padding:24px 26px;border-right:1px solid var(--line)}
.step-track article:last-child{border-right:0}
.step-track span{display:block;margin-bottom:36px;color:var(--coral);font-weight:900}
.step-track h3{margin:0;font-size:21px}
.step-track p{color:var(--muted);font-size:14px}

.problem-section{padding:90px 0;background:#e7ebe8}
.problem-grid{display:grid;grid-template-columns:.7fr 1.3fr;gap:70px}
.problem-list{border-top:1px solid #bfc9c5}
.problem-list>div{display:grid;grid-template-columns:190px 1fr;gap:22px;padding:20px 0;border-bottom:1px solid #bfc9c5}
.problem-list p{margin:0;color:#5e6966}

.related-section{padding:90px 0;background:#f9f7f1}
.related-head{margin-bottom:30px}
.related-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.related-grid a{min-height:190px;padding:24px;display:flex;flex-direction:column;text-decoration:none;border:1px solid var(--line);background:#fff}
.related-grid small{color:#9f6957;font-weight:900;letter-spacing:.11em}
.related-grid strong{margin:28px 0 18px;font-size:19px}
.related-grid span{margin-top:auto;color:#6a7572;font-size:13px}
.related-grid a:hover{transform:translateY(-3px);box-shadow:0 18px 36px rgba(0,0,0,.06)}

.faq-section{padding:96px 0;background:#fff}
.faq-grid{display:grid;grid-template-columns:.72fr 1.28fr;gap:72px}
.faq-title>p:not(.overline){color:var(--muted)}
.faq-list{border-top:1px solid var(--line)}
.faq-list details{border-bottom:1px solid var(--line)}
.faq-list summary{cursor:pointer;list-style:none;padding:22px 4px;font-size:18px;font-weight:800}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"+";float:right;color:var(--coral)}
.faq-list details[open] summary::after{content:"−"}
.faq-list details p{margin:-2px 0 24px;padding-right:40px;color:var(--muted)}

.closing{padding:75px 0;background:var(--coral);color:#fff}
.closing-inner{display:grid;grid-template-columns:1fr auto;gap:44px;align-items:center}
.closing p{margin:10px 0 0;color:#fff2e9}
.closing a{display:inline-flex;align-items:center;justify-content:center;min-height:54px;padding:12px 24px;border-radius:10px;background:#fff;color:#7d3327;text-decoration:none;font-weight:900}

.footer{padding:54px 0 90px;background:#192829;color:#d9e5e4}
.footer-inner{display:grid;grid-template-columns:1fr auto;gap:40px}
.footer-logo{display:inline-flex;padding:7px 9px;background:#0d1c1d;border-radius:9px}
.footer-logo img{height:32px;width:auto;max-width:160px;object-fit:contain}
.footer p{color:#9eafad;font-size:13px}
.footer-nav{display:flex;gap:20px;flex-wrap:wrap}
.footer-nav a{text-decoration:none;color:#d9e5e4;font-size:14px}

.mobile-bar{display:none}

@media(max-width:1024px){
  .topnav{gap:14px}
  .hero-grid{grid-template-columns:1fr .9fr;gap:35px}
  .art-paper{min-height:480px}
  .story-grid,.iphone-grid{gap:50px}
  .step-track{grid-template-columns:1fr 1fr}
  .step-track article:nth-child(2){border-right:0}
  .step-track article:nth-child(-n+2){border-bottom:1px solid var(--line)}
  .related-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:820px){
  .topbar-inner{grid-template-columns:1fr auto}
  .topnav{display:none}
  .hero-grid,.section-title-row,.story-grid,.iphone-grid,.problem-grid,.faq-grid{grid-template-columns:1fr}
  .hero-grid{padding:58px 0}
  .hero-art{max-width:680px}
  .story-side{padding-left:0}.vertical-word{display:none}
  .device-figure{max-width:600px;width:100%;margin-inline:auto}
  .iphone-grid .device-figure{order:2}
  .choice-board{grid-template-columns:1fr}
  .android-choice{border-right:0;border-bottom:1px solid var(--line)}
  .closing-inner{grid-template-columns:1fr}
  .closing a{width:100%}
}
@media(max-width:600px){
  body{font-size:15px;padding-bottom:62px}
  .wrap{width:min(100% - 28px,1180px)}
  .topbar-inner{min-height:66px}
  .logo-shell img{height:29px;max-width:145px}
  .top-cta{padding:8px 13px;font-size:13px}
  .hero h1{font-size:clamp(39px,12vw,55px)}
  .hero-lead{font-size:16px}
  .hero-actions{flex-direction:column;align-items:stretch}
  .primary-btn{width:100%}
  .hero-meta{grid-template-columns:1fr}
  .hero-meta>div{padding:12px 0;border-bottom:1px solid #d5d0c5}
  .art-paper{min-height:auto;padding:22px 20px 72px}
  .art-paper::before{display:none}
  .art-paper img{max-height:290px}
  .paper-caption{left:20px;right:20px}
  .chooser,.android-story,.iphone-story,.steps-section,.problem-section,.related-section,.faq-section{padding:64px 0}
  .choice{display:block;min-height:auto;padding:26px 22px 34px}
  .choice-no{margin-bottom:18px;display:block}
  .device-figure{min-height:390px;padding:22px}
  .device-figure img{max-height:330px}
  .step-track{grid-template-columns:1fr}
  .step-track article{min-height:auto;border-right:0;border-bottom:1px solid var(--line)}
  .step-track article:last-child{border-bottom:0}
  .step-track span{margin-bottom:16px}
  .problem-list>div{grid-template-columns:1fr;gap:4px}
  .related-grid{grid-template-columns:1fr}
  .related-grid a{min-height:145px}
  .footer-inner{grid-template-columns:1fr}
  .footer-nav{display:grid;grid-template-columns:1fr 1fr}
  .mobile-bar{
    position:fixed;left:0;right:0;bottom:0;z-index:90;height:60px;
    display:grid;grid-template-columns:1fr auto;align-items:center;gap:10px;
    padding:8px 14px;background:rgba(22,51,58,.97);color:#fff;
    border-top:1px solid rgba(255,255,255,.1)
  }
  .mobile-bar a{
    display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:8px 15px;
    background:var(--coral);color:#fff;border-radius:9px;text-decoration:none;font-weight:900
  }
}