/* QtScrcpy - Modern Tech Style */
*{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#2563eb;--primary-dark:#1d4ed8;--primary-light:#3b82f6;
  --accent:#06b6d4;--bg:#f0f4f8;--card:#fff;
  --text:#0f172a;--text-sec:#475569;--text-muted:#94a3b8;
  --border:#e2e8f0;--code-bg:#f1f5f9;
  --header-bg:rgba(255,255,255,.92);
  --shadow:0 1px 3px rgba(0,0,0,.08);
  --shadow-md:0 4px 12px rgba(0,0,0,.1);
  --shadow-lg:0 8px 24px rgba(0,0,0,.12);
  --radius:10px;--radius-sm:6px;
}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,'PingFang SC','Microsoft YaHei',sans-serif;background:var(--bg);color:var(--text);line-height:1.65}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-dark)}
img{max-width:100%;height:auto}

/* Header */
.header{background:var(--header-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
.header-inner{max-width:1100px;margin:0 auto;padding:0 20px;height:56px;display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:8px;font-size:17px;font-weight:700;color:var(--text)}
.logo img{height:28px;width:28px;border-radius:6px}
.nav{display:flex;gap:4px}
.nav a{padding:6px 14px;border-radius:var(--radius-sm);color:var(--text-sec);font-size:14px;font-weight:500;transition:all .2s}
.nav a:hover,.nav a.active{background:var(--primary);color:#fff}

/* Hero */
.hero{background:linear-gradient(135deg,#1e3a8a 0%,#2563eb 50%,#0891b2 100%);color:#fff;padding:48px 20px 44px;text-align:center}
.hero h1{font-size:32px;font-weight:800;margin-bottom:10px;letter-spacing:-.5px}
.hero .tagline{font-size:16px;opacity:.92;margin-bottom:20px}
.hero .desc{font-size:14px;opacity:.78;max-width:620px;margin:0 auto 24px}
.hero-btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:6px;padding:9px 22px;border-radius:8px;font-size:14px;font-weight:600;transition:all .25s;cursor:pointer;border:none}
.btn-primary{background:#fff;color:var(--primary)}
.btn-primary:hover{background:#f0f4f8;transform:translateY(-1px);box-shadow:var(--shadow-md)}
.btn-outline{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.5)}
.btn-outline:hover{background:rgba(255,255,255,.12);border-color:#fff}
.btn-dl{background:var(--primary);color:#fff}
.btn-dl:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:var(--shadow-md)}

/* Sections */
.section{padding:36px 20px}
.container{max-width:1100px;margin:0 auto}
.section-title{font-size:22px;font-weight:700;margin-bottom:24px;text-align:center}
.section-title span{color:var(--primary)}

/* Features */
.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.feature-card{background:var(--card);border-radius:var(--radius);padding:22px 16px;text-align:center;border:1px solid var(--border);transition:all .25s}
.feature-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--primary-light)}
.feature-icon{width:44px;height:44px;margin:0 auto 10px;background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:22px;color:#fff}
.feature-card h3{font-size:15px;font-weight:600;margin-bottom:5px}
.feature-card p{font-size:13px;color:var(--text-sec);line-height:1.5}

/* Platforms */
.platforms-section{background:var(--card);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.platforms-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.platform-card{background:var(--bg);border-radius:var(--radius);padding:20px;display:flex;align-items:center;gap:14px;border:1px solid var(--border);transition:all .2s}
.platform-card:hover{border-color:var(--primary-light);box-shadow:var(--shadow)}
.platform-card .platform-icon{width:40px;height:40px;flex-shrink:0}
.platform-card h3{font-size:15px;font-weight:600;margin-bottom:2px}
.platform-card p{font-size:12px;color:var(--text-muted)}

/* Screenshots */
.screenshots-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.screenshot-card{background:var(--card);border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);transition:all .25s}
.screenshot-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.screenshot-card img{width:100%;aspect-ratio:16/10;object-fit:cover;display:block}
.screenshot-card .caption{padding:8px 12px;font-size:13px;color:var(--text-sec);text-align:center}

/* Download */
.dl-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.dl-card{background:var(--card);border-radius:var(--radius);padding:28px 20px;text-align:center;border:1px solid var(--border);transition:all .25s}
.dl-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.dl-card .dl-icon{width:48px;height:48px;margin:0 auto 12px}
.dl-card h3{font-size:17px;font-weight:600;margin-bottom:6px}
.dl-card .version{font-size:12px;color:var(--text-muted);margin-bottom:14px}
.dl-card .btn-dl{width:100%;justify-content:center}

/* FAQ */
.faq-list{max-width:760px;margin:0 auto}
.faq-item{background:var(--card);border-radius:var(--radius);margin-bottom:10px;border:1px solid var(--border);overflow:hidden}
.faq-question{padding:14px 18px;font-size:14px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background .2s;user-select:none}
.faq-question:hover{background:var(--bg)}
.faq-question .arrow{font-size:11px;color:var(--text-muted);transition:transform .3s;flex-shrink:0;margin-left:12px}
.faq-item.active .faq-question .arrow{transform:rotate(180deg)}
.faq-answer{padding:0 18px;max-height:0;overflow:hidden;transition:all .3s ease;font-size:14px;color:var(--text-sec);line-height:1.7}
.faq-item.active .faq-answer{padding:0 18px 14px;max-height:500px}
.faq-answer a{color:var(--primary)}
.faq-answer ol,.faq-answer ul{padding-left:20px;margin:6px 0}
.faq-answer li{margin-bottom:3px}

/* Tutorial */
.tutorial-content{max-width:760px;margin:0 auto}
.step{background:var(--card);border-radius:var(--radius);padding:20px;margin-bottom:14px;border:1px solid var(--border)}
.step-header{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.step-num{width:28px;height:28px;background:var(--primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;flex-shrink:0}
.step h3{font-size:16px;font-weight:600}
.step p,.step li{font-size:14px;color:var(--text-sec);line-height:1.7}
.step ul,.step ol{padding-left:20px;margin:6px 0}
.step li{margin-bottom:3px}
.step img{margin-top:10px;border-radius:var(--radius-sm);border:1px solid var(--border)}
.tip{background:#eff6ff;border:1px solid #bfdbfe;border-radius:var(--radius-sm);padding:10px 14px;font-size:13px;color:#1e40af;margin-top:10px}

/* About */
.about-section{background:var(--card);border-top:1px solid var(--border)}
.about-content{max-width:760px;margin:0 auto;font-size:14px;color:var(--text-sec);line-height:1.8}
.about-content p{margin-bottom:10px}
.about-links{display:flex;gap:12px;margin-top:16px;flex-wrap:wrap}
.about-links a{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;background:var(--bg);border-radius:var(--radius-sm);font-size:13px;font-weight:500;border:1px solid var(--border);transition:all .2s}
.about-links a:hover{border-color:var(--primary);color:var(--primary)}

/* CTA */
.cta-section{background:linear-gradient(135deg,#1e3a8a,#2563eb);color:#fff;text-align:center;padding:36px 20px}
.cta-section h2{font-size:22px;font-weight:700;margin-bottom:8px}
.cta-section p{font-size:14px;opacity:.85;margin-bottom:18px}

/* Footer */
.footer{background:#0f172a;color:#94a3b8;padding:24px 20px;text-align:center;font-size:13px}
.footer a{color:#cbd5e1}
.footer a:hover{color:#fff}
.footer p{margin-bottom:4px}

/* Responsive */
@media(max-width:900px){
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .platforms-grid{grid-template-columns:1fr}
  .screenshots-grid{grid-template-columns:repeat(2,1fr)}
  .dl-grid{grid-template-columns:1fr}
}
@media(max-width:600px){
  .header-inner{flex-direction:column;height:auto;padding:10px 16px;gap:8px}
  .nav{flex-wrap:wrap;justify-content:center}
  .nav a{padding:5px 10px;font-size:13px}
  .hero{padding:32px 16px 28px}
  .hero h1{font-size:24px}
  .hero .tagline{font-size:14px}
  .features-grid{grid-template-columns:1fr}
  .screenshots-grid{grid-template-columns:1fr}
  .section{padding:28px 16px}
  .section-title{font-size:19px}
}

/* Page Hero (subpages) */
.page-hero{background:linear-gradient(135deg,#1e3a8a 0%,#2563eb 50%,#0891b2 100%);color:#fff;padding:36px 20px 32px;text-align:center}
.page-hero h1{font-size:28px;font-weight:800;margin-bottom:8px}
.page-hero p{font-size:15px;opacity:.88}

/* Fade-in animation */
.fade-in{opacity:0;transform:translateY(16px);transition:opacity .5s ease,transform .5s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}

/* QR breathing border */
@keyframes qrBreathe{
  0%,100%{border-color:#2563eb;box-shadow:0 0 6px rgba(37,99,235,.25)}
  50%{border-color:#06b6d4;box-shadow:0 0 14px rgba(6,182,212,.35)}
}
.qr-frame{border:2.5px solid #2563eb;border-radius:10px;padding:8px;display:inline-block;aspect-ratio:1/1;animation:qrBreathe 2.5s ease-in-out infinite}

/* Download modal */
.dl-modal{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.55);z-index:9999;justify-content:center;align-items:center}
.dl-modal.show{display:flex}
.dl-modal-box{background:#fff;border-radius:14px;padding:28px 24px;max-width:520px;width:92%;position:relative;box-shadow:0 12px 40px rgba(0,0,0,.2);max-height:90vh;overflow-y:auto}
.dl-modal-close{position:absolute;top:10px;right:14px;background:none;border:none;font-size:22px;cursor:pointer;color:#94a3b8;line-height:1}
.dl-modal-close:hover{color:#475569}
.dl-modal-title{font-size:18px;font-weight:700;margin-bottom:16px;color:#0f172a;text-align:center}
.dl-qr-row{display:flex;gap:20px;justify-content:center;flex-wrap:wrap;margin-bottom:16px}
.dl-qr-item{text-align:center;flex:1;min-width:140px}
.dl-qr-item img{width:130px;height:130px;object-fit:contain}
.dl-qr-label{font-size:13px;font-weight:600;margin-top:8px;color:#0f172a}
.dl-qr-hint{font-size:12px;color:#64748b;margin-top:3px}

/* Resource details */
.res-details{background:#f8fafc;border-radius:8px;padding:14px 16px;margin-bottom:16px}
.res-details h4{font-size:14px;font-weight:600;margin-bottom:8px;color:#0f172a}
.res-details li{font-size:13px;color:#475569;margin-bottom:4px;list-style:none;padding-left:20px;position:relative}
.res-details li::before{content:"\2713";position:absolute;left:0;color:#059669;font-weight:700}

/* Timeliness notice */
.time-notice{background:#fff7ed;border:1px solid #fed7aa;border-radius:8px;padding:10px 14px;font-size:12px;color:#9a3412;text-align:center;margin-bottom:14px}