/* ===== Reset & Base ===== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#0f1115;
  --bg-2:#161a21;
  --bg-3:#1c2129;
  --card:#1a1e26;
  --border:#2a3040;
  --text:#e4e7ec;
  --text-2:#9ba3b4;
  --text-3:#6b7280;
  --accent:#3b82f6;
  --accent-2:#2563eb;
  --accent-3:#60a5fa;
  --green:#22c55e;
  --red:#ef4444;
  --orange:#f59e0b;
  --radius:8px;
  --max-w:1200px;
}
html{scroll-behavior:smooth;font-size:16px}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--accent-3);text-decoration:none;transition:color .2s}
a:hover{color:var(--accent)}
img{max-width:100%;height:auto;display:block}
.container{max-width:var(--max-w);margin:0 auto;padding:0 20px}

/* ===== Header ===== */
.site-header{
  background:var(--bg-2);
  border-bottom:1px solid var(--border);
  position:sticky;top:0;z-index:100;
  backdrop-filter:blur(12px);
  background:rgba(22,26,33,.92);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:62px;
}
.logo{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:700;color:var(--text)}
.logo svg{width:28px;height:28px}
.logo span{letter-spacing:-.3px}
.nav{display:flex;align-items:center;gap:28px}
.nav a{color:var(--text-2);font-size:14px;font-weight:500;transition:color .2s}
.nav a:hover,.nav a.active{color:var(--text)}
.nav a.active{position:relative}
.nav a.active::after{content:'';position:absolute;bottom:-22px;left:0;right:0;height:2px;background:var(--accent);border-radius:2px}
.mobile-toggle{display:none;background:none;border:none;color:var(--text);font-size:22px;cursor:pointer}

/* ===== Hero ===== */
.hero{
  padding:72px 0 56px;
  background:linear-gradient(180deg,var(--bg-2) 0%,var(--bg) 100%);
  position:relative;overflow:hidden;
}
.hero::before{
  content:'';position:absolute;top:-50%;right:-10%;width:600px;height:600px;
  background:radial-gradient(circle,rgba(59,130,246,.08) 0%,transparent 70%);
  pointer-events:none;
}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;position:relative}
.hero h1{font-size:34px;font-weight:800;line-height:1.3;margin-bottom:18px;letter-spacing:-.5px}
.hero h1 .hl{color:var(--accent-3)}
.hero .desc{font-size:16px;color:var(--text-2);margin-bottom:28px;max-width:540px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:30px}
.hero-tags span{
  background:var(--bg-3);border:1px solid var(--border);
  padding:5px 14px;border-radius:20px;font-size:13px;color:var(--text-2);
}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 28px;border-radius:var(--radius);font-size:15px;font-weight:600;
  cursor:pointer;transition:all .2s;border:none;
}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-2);color:#fff;transform:translateY(-1px)}
.btn-outline{background:transparent;color:var(--text);border:1px solid var(--border)}
.btn-outline:hover{border-color:var(--accent);color:var(--accent-3)}
.hero-img{border-radius:12px;overflow:hidden;border:1px solid var(--border);box-shadow:0 20px 60px rgba(0,0,0,.4)}
.hero-img img{width:100%}

/* ===== Section ===== */
.section{padding:56px 0}
.section-alt{background:var(--bg-2)}
.section-title{font-size:26px;font-weight:700;margin-bottom:8px;text-align:center}
.section-desc{text-align:center;color:var(--text-2);font-size:15px;margin-bottom:40px;max-width:640px;margin-left:auto;margin-right:auto}

/* ===== Features ===== */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:28px;transition:border-color .2s;
}
.feature-card:hover{border-color:var(--accent)}
.feature-icon{width:44px;height:44px;border-radius:10px;background:rgba(59,130,246,.12);display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.feature-icon svg{width:22px;height:22px;color:var(--accent-3)}
.feature-card h3{font-size:17px;font-weight:600;margin-bottom:8px}
.feature-card p{font-size:14px;color:var(--text-2);line-height:1.6}

/* ===== Screenshots ===== */
.shot-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.shot-item{border-radius:10px;overflow:hidden;border:1px solid var(--border);background:var(--card)}
.shot-item img{width:100%;transition:transform .3s}
.shot-item:hover img{transform:scale(1.02)}
.shot-item .cap{padding:14px 18px;font-size:13px;color:var(--text-2)}

/* ===== Speed Table ===== */
.speed-table{width:100%;border-collapse:collapse;margin-top:8px}
.speed-table th,.speed-table td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--border);font-size:14px}
.speed-table th{color:var(--text-2);font-weight:600;font-size:13px;text-transform:uppercase;letter-spacing:.5px}
.speed-table td{color:var(--text)}
.speed-table tr:hover{background:var(--bg-3)}
.speed-table .badge{display:inline-block;padding:3px 10px;border-radius:4px;font-size:12px;font-weight:600}
.badge-green{background:rgba(34,197,94,.15);color:var(--green)}
.badge-blue{background:rgba(59,130,246,.15);color:var(--accent-3)}
.badge-orange{background:rgba(245,158,11,.15);color:var(--orange)}

/* ===== Download Page ===== */
.dl-editions{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:40px}
.dl-card{
  background:var(--card);border:1px solid var(--border);border-radius:12px;
  padding:28px;text-align:center;transition:all .2s;
}
.dl-card:hover{border-color:var(--accent);transform:translateY(-2px)}
.dl-card .edition-tag{font-size:13px;color:var(--text-3);margin-bottom:6px}
.dl-card h3{font-size:20px;font-weight:700;margin-bottom:10px}
.dl-card .dl-img{border-radius:8px;overflow:hidden;margin-bottom:18px;border:1px solid var(--border)}
.dl-card .dl-img img{width:100%}
.dl-card .dl-desc{font-size:13px;color:var(--text-2);margin-bottom:18px;min-height:40px}
.dl-btns{display:flex;flex-direction:column;gap:10px}
.dl-btn{
  display:flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border-radius:var(--radius);font-size:14px;font-weight:600;
  cursor:pointer;transition:all .2s;border:none;
}
.dl-btn-quark{background:#3b82f6;color:#fff}
.dl-btn-quark:hover{background:#2563eb;color:#fff}
.dl-btn-baidu{background:#2a3040;color:var(--text);border:1px solid var(--border)}
.dl-btn-baidu:hover{border-color:var(--accent);color:var(--accent-3)}
.dl-info{background:var(--bg-3);border-radius:8px;padding:16px;margin-top:14px}
.dl-info p{font-size:13px;color:var(--text-2);margin-bottom:4px}
.dl-info p:last-child{margin-bottom:0}

/* Tutorial */
.toc{background:var(--card);border:1px solid var(--border);border-radius:8px;padding:20px 24px;margin-bottom:32px}
.toc h4{font-size:14px;color:var(--text-2);margin-bottom:10px;text-transform:uppercase;letter-spacing:.5px}
.toc ol{padding-left:20px}
.toc ol li{margin-bottom:6px;font-size:14px}
.toc ol li a{color:var(--text-2)}
.toc ol li a:hover{color:var(--accent-3)}
.tutorial-content{max-width:820px;margin:0 auto}
.tutorial-content h2{font-size:22px;font-weight:700;margin:36px 0 14px;padding-bottom:10px;border-bottom:1px solid var(--border)}
.tutorial-content h2:first-child{margin-top:0}
.tutorial-content h3{font-size:17px;font-weight:600;margin:24px 0 10px}
.tutorial-content p{margin-bottom:14px;color:var(--text-2);font-size:15px}
.tutorial-content ul,.tutorial-content ol{margin-bottom:14px;padding-left:22px}
.tutorial-content li{margin-bottom:6px;color:var(--text-2);font-size:15px}
.tutorial-content strong{color:var(--text)}
.tutorial-content .note{
  background:rgba(59,130,246,.08);border-left:3px solid var(--accent);
  padding:14px 18px;border-radius:0 6px 6px 0;margin:18px 0;font-size:14px;color:var(--text-2);
}
.tutorial-content .warn{
  background:rgba(245,158,11,.08);border-left:3px solid var(--orange);
  padding:14px 18px;border-radius:0 6px 6px 0;margin:18px 0;font-size:14px;color:var(--text-2);
}
.tutorial-content img{border-radius:8px;border:1px solid var(--border);margin:16px 0}

/* FAQ */
.faq-list{max-width:820px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--border);padding:4px 0}
.faq-item summary{
  cursor:pointer;padding:18px 0;font-size:16px;font-weight:600;color:var(--text);
  list-style:none;display:flex;justify-content:space-between;align-items:center;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'+';font-size:20px;color:var(--text-3);transition:transform .2s}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item .faq-answer{padding:0 0 18px;color:var(--text-2);font-size:15px}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:8px}
.step{position:relative;padding-left:0}
.step-num{
  width:36px;height:36px;border-radius:50%;background:var(--accent);
  color:#fff;display:flex;align-items:center;justify-content:center;
  font-size:16px;font-weight:700;margin-bottom:14px;
}
.step h4{font-size:15px;font-weight:600;margin-bottom:6px}
.step p{font-size:13px;color:var(--text-2);line-height:1.6}

/* CTA */
.cta-section{background:var(--bg-2);text-align:center;padding:56px 0}
.cta-section h2{font-size:26px;font-weight:700;margin-bottom:10px}
.cta-section p{color:var(--text-2);margin-bottom:24px}

/* Footer */
.site-footer{background:var(--bg-2);border-top:1px solid var(--border);padding:36px 0 20px}
.footer-nav{display:flex;justify-content:center;gap:24px;margin-bottom:20px;flex-wrap:wrap}
.footer-nav a{font-size:13px;color:var(--text-3)}
.footer-nav a:hover{color:var(--text-2)}
.footer-disclaimer{text-align:center;font-size:13px;color:var(--text-3);margin-bottom:10px;line-height:1.6}
.footer-copy{text-align:center;font-size:12px;color:var(--text-3)}

/* Download Modal */
.modal-overlay{
  display:none;position:fixed;top:0;left:0;width:100%;height:100%;
  background:rgba(0,0,0,.75);z-index:9999;align-items:center;justify-content:center;
  opacity:0;transition:opacity .3s ease;
}
.modal-overlay.show{display:flex;opacity:1}
.modal-box{
  background:var(--card);border:1px solid var(--border);border-radius:16px;
  padding:36px 32px;max-width:420px;width:90%;text-align:center;position:relative;
  transform:scale(.92);transition:transform .3s ease;
}
.modal-overlay.show .modal-box{transform:scale(1)}
.modal-close{position:absolute;top:14px;right:18px;background:none;border:none;color:var(--text-3);font-size:24px;cursor:pointer;line-height:1;transition:color .2s}
.modal-close:hover{color:var(--text)}
.modal-box h3{font-size:20px;font-weight:700;margin-bottom:8px;color:var(--text)}
.modal-box .modal-sub{font-size:14px;color:var(--text-2);margin-bottom:22px}

/* QR code with breathing border effect */
.modal-qr{
  width:180px;height:180px;margin:0 auto 16px;border-radius:12px;
  overflow:hidden;padding:6px;background:var(--bg-3);
  border:2px solid var(--accent-3);
  animation:qr-breathing 2.8s ease-in-out infinite;
}
.modal-qr img{width:100%;height:100%;border-radius:8px}

/* Breathing animation - subtle size and glow change, not harsh */
@keyframes qr-breathing{
  0%,100%{
    border-color:var(--accent-3);
    box-shadow:0 0 6px rgba(96,165,250,.25),0 0 0 0 rgba(96,165,250,.15);
    transform:scale(1);
  }
  50%{
    border-color:var(--accent);
    box-shadow:0 0 18px rgba(96,165,250,.45),0 0 0 4px rgba(96,165,250,.1);
    transform:scale(1.03);
  }
}

/* Also apply breathing to any inline QR code containers */
.qrcode-container{
  display:inline-block;padding:6px;border-radius:12px;background:var(--bg-3);
  border:2px solid var(--accent-3);
  animation:qr-breathing 2.8s ease-in-out infinite;
}
.qrcode-container img{display:block;border-radius:8px}

.modal-features{
  text-align:left;margin-bottom:18px;padding:16px;background:var(--bg-3);border-radius:10px;
}
.modal-feature-item{
  display:flex;align-items:flex-start;gap:10px;margin-bottom:10px;font-size:13px;color:var(--text-2);
}
.modal-feature-item:last-child{margin-bottom:0}
.modal-feature-item svg{color:var(--green);flex-shrink:0;margin-top:2px}

/* ===== About Page ===== */
.about-block{
  background:var(--card);border:1px solid var(--border);border-radius:10px;
  padding:28px;margin-bottom:24px;
}
.about-block h3{font-size:18px;font-weight:600;margin-bottom:14px;color:var(--accent-3)}
.about-block p{color:var(--text-2);font-size:14px;line-height:1.7;margin-bottom:10px}
.about-block ul{padding-left:20px;margin-bottom:10px}
.about-block li{color:var(--text-2);font-size:14px;margin-bottom:8px}
.why-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:16px}
.why-item{
  background:var(--bg-3);border-radius:10px;padding:20px;text-align:center;
}
.why-icon{
  width:44px;height:44px;border-radius:10px;background:rgba(59,130,246,.12);
  display:flex;align-items:center;justify-content:center;margin:0 auto 12px;
}
.why-icon svg{width:22px;height:22px;color:var(--accent-3)}
.why-item h4{font-size:14px;font-weight:600;margin-bottom:4px}
.why-item p{font-size:12px;color:var(--text-3)}

/* ===== Contact Page ===== */
.contact-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:24px;margin-bottom:32px}
.contact-info{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:28px}
.contact-info h3{font-size:18px;font-weight:600;margin-bottom:18px;color:var(--accent-3)}
.contact-item{display:flex;gap:14px;margin-bottom:18px}
.contact-item:last-child{margin-bottom:0}
.contact-icon{
  flex-shrink:0;width:38px;height:38px;border-radius:8px;background:rgba(59,130,246,.12);
  display:flex;align-items:center;justify-content:center;
}
.contact-icon svg{width:18px;height:18px;color:var(--accent-3)}
.contact-item h4{font-size:14px;font-weight:600;margin-bottom:3px}
.contact-item p{font-size:13px;color:var(--text-3);line-height:1.5}

.contact-form-wrap{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:28px}
.contact-form-wrap h3{font-size:18px;font-weight:600;margin-bottom:18px;color:var(--accent-3)}
.contact-form{display:flex;flex-direction:column;gap:14px}
.form-group{display:flex;flex-direction:column;gap:6px}
.form-group label{font-size:13px;font-weight:500;color:var(--text-2)}
.form-group input,.form-group select,.form-group textarea{
  background:var(--bg-3);border:1px solid var(--border);border-radius:8px;
  padding:10px 14px;font-size:14px;color:var(--text);font-family:inherit;
  transition:border-color .2s;
}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{
  outline:none;border-color:var(--accent);
}
.form-group textarea{resize:vertical;min-height:100px}
.btn-block{width:100%;justify-content:center}

.contact-faq{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:28px}
.contact-faq h3{font-size:18px;font-weight:600;margin-bottom:10px;color:var(--accent-3)}
.contact-faq p{color:var(--text-2);font-size:14px;margin-bottom:14px}
.faq-links{display:flex;flex-direction:column;gap:10px}
.faq-links a{
  display:block;padding:12px 16px;background:var(--bg-3);border-radius:8px;
  font-size:13px;color:var(--text-2);transition:all .2s;
}
.faq-links a:hover{background:rgba(59,130,246,.08);color:var(--accent-3)}

/* ===== Breadcrumb ===== */
.breadcrumb{
  padding:16px 0;font-size:13px;color:var(--text-3);
}
.breadcrumb a{color:var(--text-3)}
.breadcrumb a:hover{color:var(--accent-3)}
.breadcrumb span{margin:0 8px}

/* Responsive */
@media(max-width:768px){
  .nav{display:none;position:absolute;top:62px;left:0;right:0;background:var(--bg-2);flex-direction:column;padding:16px 20px;gap:16px;border-bottom:1px solid var(--border)}
  .nav.open{display:flex}
  .mobile-toggle{display:block}
  .hero{padding:40px 0 32px}
  .hero-grid{grid-template-columns:1fr;gap:24px}
  .hero h1{font-size:26px}
  .features-grid{grid-template-columns:1fr}
  .shot-grid{grid-template-columns:1fr}
  .dl-editions{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr 1fr}
  .why-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .section{padding:36px 0}
  .section-title{font-size:22px}
  .speed-table{font-size:13px}
  .speed-table th,.speed-table td{padding:10px 12px}
}
@media(max-width:480px){
  .steps{grid-template-columns:1fr}
  .hero h1{font-size:22px}
}