:root{
  --bg:#f3f6f8;
  --surface:#ffffff;
  --ink:#14202b;
  --muted:#5f6f7e;
  --line:#dbe3e8;
  --dark:#0b1620;
  --dark-2:#102431;
  --accent:#d93333;
  --accent-dark:#aa1f27;
  --accent-soft:#fff0f0;
  --gold:#ba8a35;
  --radius:24px;
  --shadow:0 18px 55px rgba(10,28,40,.10);
  --max:1180px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Arial,"Microsoft YaHei","PingFang SC",sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit}
.skip-link{position:absolute;left:-9999px;top:0;z-index:1000;background:#fff;padding:10px 16px}
.skip-link:focus{left:12px;top:12px}

.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(8,20,29,.95);
  border-bottom:1px solid rgba(255,255,255,.08);
  backdrop-filter:blur(12px);
}
.header-inner{max-width:var(--max);margin:auto;min-height:72px;padding:0 24px;display:flex;align-items:center;gap:28px}
.brand{display:flex;align-items:center;gap:12px;color:#fff;margin-right:auto}
.brand-mark{width:40px;height:40px;border-radius:12px;background:linear-gradient(145deg,#ee4545,#981c22);display:grid;place-items:center;font-weight:900;box-shadow:inset 0 0 0 1px rgba(255,255,255,.2)}
.brand-copy{display:flex;flex-direction:column;line-height:1.15}
.brand-copy strong{font-size:17px;letter-spacing:.2px}
.brand-copy small{font-size:11px;color:#aebbc4;margin-top:4px}
.site-nav{display:flex;align-items:center;gap:22px}
.site-nav a{font-size:14px;color:#d9e1e6}
.site-nav a:hover{color:#fff}
.header-cta{padding:10px 16px;border-radius:999px;background:#fff;color:#111c24;font-size:14px;font-weight:700}
.nav-toggle{display:none;background:transparent;color:#fff;border:1px solid rgba(255,255,255,.25);border-radius:10px;padding:8px 11px}

.hero{background:linear-gradient(135deg,#08141d 0%,#102b39 58%,#3b171b 100%);color:#fff;overflow:hidden}
.hero-inner{max-width:var(--max);margin:auto;padding:78px 24px 64px;display:grid;grid-template-columns:minmax(0,1.02fr) minmax(420px,.98fr);gap:64px;align-items:center}
.eyebrow,.section-kicker{text-transform:uppercase;letter-spacing:.12em;font-size:12px;font-weight:800;color:var(--accent);margin:0 0 12px}
.hero .eyebrow{color:#ff8d8d}
h1{font-size:clamp(40px,6vw,72px);line-height:1.05;letter-spacing:-.045em;margin:0 0 24px;max-width:820px}
.hero-lead{font-size:18px;color:#dbe6ec;max-width:690px;margin:0}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:32px 0 26px}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:12px 20px;border-radius:13px;font-weight:800;transition:.2s ease}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 12px 30px rgba(217,51,51,.28)}
.btn-primary:hover{background:#e63b3b}
.btn-secondary{border:1px solid rgba(255,255,255,.25);color:#fff;background:rgba(255,255,255,.05)}
.btn-light{background:#fff;color:#13202a;min-width:230px}
.hero-points{display:flex;flex-wrap:wrap;gap:10px 22px;padding:0;margin:0;list-style:none;color:#b9c8d2;font-size:13px}
.hero-points li::before{content:"✓";color:#ff9b9b;margin-right:7px;font-weight:900}
.hero-visual{margin:0;position:relative}
.hero-visual::before{content:"";position:absolute;inset:-24px -35px 35px 50px;border:1px solid rgba(255,255,255,.13);border-radius:34px;transform:rotate(3deg)}
.hero-visual img{position:relative;width:100%;max-height:520px;object-fit:contain;border-radius:28px;background:#0d1921;box-shadow:0 30px 70px rgba(0,0,0,.35)}
.hero-visual figcaption{position:relative;font-size:12px;color:#b9c8d2;margin-top:12px;text-align:right}

section{padding-left:24px;padding-right:24px}
.section-heading{max-width:780px;margin:0 auto 40px;text-align:center}
.section-heading h2,.download-intro h2,.editorial-copy h2,.problem-title h2,.faq-copy h2,.final-cta h2{font-size:clamp(29px,4vw,46px);line-height:1.15;letter-spacing:-.03em;margin:0 0 16px}
.section-heading p,.download-intro>p,.editorial-copy>p,.faq-copy>p{color:var(--muted);margin:0}

.visual-strip{max-width:var(--max);margin:-18px auto 0;padding-top:72px;padding-bottom:86px}
.compact-heading{margin-bottom:30px}
.media-grid{display:grid;gap:18px}
.media-grid-three{grid-template-columns:1fr 1fr 1.2fr;align-items:stretch}
.media-card{margin:0;background:var(--surface);border:1px solid var(--line);border-radius:20px;overflow:hidden;box-shadow:0 10px 30px rgba(14,33,46,.06)}
.media-box{background:#111b22;display:flex;align-items:center;justify-content:center;overflow:hidden}
.portrait-box{height:330px}
.landscape-box{height:330px}
.media-box img{width:100%;height:100%;object-fit:contain}
.media-card figcaption{padding:17px 18px 19px;display:flex;flex-direction:column;gap:4px}
.media-card figcaption strong{font-size:15px}
.media-card figcaption span{font-size:13px;color:var(--muted)}

.download-section{background:#fff;padding-top:82px;padding-bottom:90px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.download-intro{max-width:var(--max);margin:auto;display:grid;grid-template-columns:.85fr 1.15fr;gap:70px;align-items:end}
.download-intro>p{font-size:17px}
.device-layout{max-width:var(--max);margin:40px auto 0;display:grid;grid-template-columns:1fr 1fr;gap:20px}
.device-panel{position:relative;padding:34px;border-radius:26px;border:1px solid var(--line);overflow:hidden}
.device-mobile{background:linear-gradient(145deg,#fff7f7,#fff)}
.device-desktop{background:linear-gradient(145deg,#eef6f9,#fff)}
.device-icon{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;background:var(--dark);color:#fff;font-weight:900;margin-bottom:22px}
.device-label{font-size:12px;letter-spacing:.14em;text-transform:uppercase;font-weight:800;color:var(--accent);margin:0 0 7px}
.device-panel h3{font-size:27px;margin:0 0 12px}
.device-panel>p{color:var(--muted);margin:0 0 16px}
.device-panel ul{padding-left:20px;margin:0 0 20px;color:#32414d}
.text-link{font-weight:800;color:var(--accent-dark)}
.download-callout{max-width:var(--max);margin:22px auto 0;background:var(--dark);color:#fff;border-radius:20px;padding:21px 24px;display:flex;align-items:center;justify-content:space-between;gap:22px}
.download-callout div{display:flex;flex-direction:column;gap:4px}
.download-callout span{color:#bcc8cf;font-size:13px}

.editorial-section{max-width:var(--max);margin:auto;padding-top:94px;padding-bottom:96px;display:grid;grid-template-columns:.95fr 1.05fr;gap:70px;align-items:center}
.check-list{display:grid;gap:14px;margin-top:28px}
.check-list>div{display:grid;grid-template-columns:44px 1fr;gap:14px;align-items:start;padding:15px 0;border-top:1px solid var(--line)}
.check-list span{width:40px;height:40px;border-radius:12px;background:var(--accent-soft);color:var(--accent-dark);display:grid;place-items:center;font-weight:900;font-size:12px}
.check-list p{margin:0;color:var(--muted)}
.check-list strong{color:var(--ink);display:block;margin-bottom:2px}
.editorial-media{margin:0}
.editorial-media img{width:100%;border-radius:26px;box-shadow:var(--shadow)}
.editorial-media figcaption,.wide-media figcaption{font-size:12px;color:#75838e;margin-top:10px}

.steps-section{background:#0d1b25;color:#fff;padding-top:88px;padding-bottom:92px}
.steps-section .section-heading p{color:#b8c6cf}
.steps-section .section-kicker{color:#ff8f8f}
.steps-list{max-width:900px;margin:0 auto;padding:0;list-style:none;border-top:1px solid rgba(255,255,255,.13)}
.steps-list li{display:grid;grid-template-columns:72px 1fr;gap:22px;padding:25px 0;border-bottom:1px solid rgba(255,255,255,.13)}
.step-no{width:54px;height:54px;border:1px solid rgba(255,255,255,.2);border-radius:18px;display:grid;place-items:center;color:#ff9d9d;font-weight:900}
.steps-list h3{font-size:20px;margin:0 0 5px}
.steps-list p{color:#b9c7d0;margin:0}
.wide-media{max-width:var(--max);margin:48px auto 0;display:grid;grid-template-columns:1fr 1fr;gap:20px}
.wide-media figure{margin:0}
.wide-media img{width:100%;height:250px;object-fit:contain;background:#08131b;border-radius:20px}
.wide-media figcaption{color:#98aab5}

.problem-section{max-width:var(--max);margin:auto;padding-top:92px;padding-bottom:94px;display:grid;grid-template-columns:.75fr 1.25fr;gap:70px}
.problem-table{background:#fff;border:1px solid var(--line);border-radius:22px;overflow:hidden}
.problem-row{display:grid;grid-template-columns:.55fr 1.45fr;gap:24px;padding:21px 24px;border-bottom:1px solid var(--line)}
.problem-row:last-child{border-bottom:0}
.problem-row span{color:var(--muted)}

.faq-section{background:#fff;border-top:1px solid var(--line);padding-top:90px;padding-bottom:96px;display:grid;grid-template-columns:.72fr 1.28fr;gap:70px}
.faq-section>*{width:100%;max-width:760px}
.faq-copy{margin-left:auto}
.faq-list{margin-right:auto}
.faq-list details{border-bottom:1px solid var(--line);padding:18px 0}
.faq-list summary{cursor:pointer;font-size:17px;font-weight:800;list-style:none;position:relative;padding-right:34px}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"+";position:absolute;right:4px;top:-3px;font-size:26px;color:var(--accent)}
.faq-list details[open] summary::after{content:"−"}
.faq-list p{color:var(--muted);margin:11px 0 0;padding-right:24px}

.final-cta{max-width:var(--max);margin:80px auto;padding:42px 44px;background:linear-gradient(135deg,#a71f27,#d63b3b);color:#fff;border-radius:28px;display:flex;align-items:center;justify-content:space-between;gap:40px;box-shadow:0 24px 55px rgba(128,26,33,.22)}
.final-cta p{margin:0;color:#ffe6e6;max-width:720px}
.final-cta .section-kicker{color:#ffd3d3}

.site-footer{background:#08131b;color:#d7e0e5;padding:42px 24px 92px}
.footer-inner{max-width:var(--max);margin:auto;display:flex;justify-content:space-between;gap:40px;align-items:flex-start}
.footer-inner strong{font-size:17px;color:#fff}
.footer-inner p{font-size:13px;color:#93a4af;margin:6px 0 0;max-width:540px}
.footer-inner nav{display:flex;flex-wrap:wrap;gap:14px 22px;font-size:13px;color:#bdc9d0}

.mobile-download-bar{display:none}

@media (max-width:980px){
  .hero-inner{grid-template-columns:1fr;gap:36px;padding-top:58px}
  .hero-visual{max-width:700px}
  .media-grid-three{grid-template-columns:1fr 1fr}
  .media-grid-three .media-card:last-child{grid-column:1/-1}
  .download-intro,.editorial-section,.problem-section,.faq-section{grid-template-columns:1fr;gap:34px}
  .faq-section>*{max-width:var(--max);margin-left:auto;margin-right:auto}
  .site-nav{display:none;position:absolute;left:20px;right:20px;top:70px;background:#10202b;border:1px solid rgba(255,255,255,.1);border-radius:16px;padding:14px;flex-direction:column;align-items:stretch}
  .site-nav.is-open{display:flex}
  .nav-toggle{display:block}
  .header-cta{display:none}
}

@media (max-width:720px){
  body{padding-bottom:64px}
  .header-inner{padding:0 16px;min-height:64px}
  .brand-copy small{display:none}
  section{padding-left:16px;padding-right:16px}
  .hero-inner{padding:46px 16px 46px}
  h1{font-size:42px}
  .hero-lead{font-size:16px}
  .hero-actions{flex-direction:column;align-items:stretch}
  .btn{width:100%}
  .hero-points{display:grid;gap:6px}
  .hero-visual::before{display:none}
  .visual-strip{padding-top:56px;padding-bottom:62px}
  .media-grid-three{grid-template-columns:1fr}
  .media-grid-three .media-card:last-child{grid-column:auto}
  .portrait-box,.landscape-box{height:280px}
  .download-section{padding-top:58px;padding-bottom:64px}
  .download-intro{gap:10px}
  .device-layout{grid-template-columns:1fr}
  .device-panel{padding:26px 22px}
  .download-callout{align-items:flex-start;flex-direction:column}
  .download-callout .btn{width:auto}
  .editorial-section{padding-top:64px;padding-bottom:66px}
  .steps-section{padding-top:62px;padding-bottom:66px}
  .steps-list li{grid-template-columns:52px 1fr;gap:14px}
  .step-no{width:44px;height:44px;border-radius:14px}
  .wide-media{grid-template-columns:1fr}
  .wide-media img{height:auto;max-height:260px}
  .problem-section{padding-top:62px;padding-bottom:64px}
  .problem-row{grid-template-columns:1fr;gap:5px;padding:18px}
  .faq-section{padding-top:62px;padding-bottom:66px}
  .final-cta{margin:54px 16px;padding:30px 24px;flex-direction:column;align-items:flex-start}
  .final-cta .btn{width:100%}
  .footer-inner{flex-direction:column}
  .mobile-download-bar{position:fixed;z-index:60;left:0;right:0;bottom:0;height:60px;background:#07131b;color:#fff;border-top:1px solid rgba(255,255,255,.12);padding:8px 12px;display:flex;align-items:center;justify-content:space-between;gap:12px}
  .mobile-download-bar span{font-size:13px;font-weight:800}
  .mobile-download-bar a{background:var(--accent);color:#fff;padding:9px 15px;border-radius:10px;font-size:13px;font-weight:800}
}

@media (max-width:390px){
  h1{font-size:38px}
  .section-heading h2,.download-intro h2,.editorial-copy h2,.problem-title h2,.faq-copy h2,.final-cta h2{font-size:30px}
  .hero-inner,.header-inner,section{min-width:0}
  .brand-copy strong{font-size:15px}
  .media-box{height:250px}
  .device-panel h3{font-size:24px}
}

/* WPT official brand icon */
.brand-logo{
    display:block;
    width:38px;
    height:38px;
    min-width:38px;
    object-fit:contain;
    flex:0 0 auto;
}

@media(max-width:600px){
    .brand-logo{
        width:34px;
        height:34px;
        min-width:34px;
    }
}