:root {
  --pri: #7c3aed;
  --pri-dark: #6d28d9;
  --pri-lit: #ede9fe;
  --sec: #e11d48;
  --sec-dark: #be123c;
  --acc: #FBBC05;
  --alert: #EA4335;

  --text: #202124;
  --text-2: #5F6368;
  --text-3: #9AA0A6;

  --bg: #FFFFFF;
  --bg-2: #F8F9FA;
  --bg-3: #F1F3F4;

  --border: #DADCE0;
  --border-lt: #E8EAED;

  --shadow-xs: 0 1px 2px rgba(60,64,67,.08);
  --shadow-sm: 0 1px 3px rgba(60,64,67,.1),0 1px 2px rgba(60,64,67,.07);
  --shadow-md: 0 2px 8px rgba(60,64,67,.1),0 1px 3px rgba(60,64,67,.07);
  --shadow-lg: 0 4px 16px rgba(60,64,67,.12),0 1px 4px rgba(60,64,67,.08);
  --shadow-xl: 0 8px 32px rgba(60,64,67,.14);

  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 24px;
  --r-xl: 32px;
  --r-full: 9999px;

  --grad-pri: linear-gradient(135deg, var(--pri), var(--pri-dark));
  --grad-hero: linear-gradient(90deg, var(--pri), var(--sec));

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --t-fast: .18s ease;
  --t-md: .28s ease;
  --w: 1200px;
}

*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{font-size:16px;scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.65}
a{color:var(--pri);text-decoration:none;transition:color var(--t-fast)}
a:hover{color:var(--pri-dark)}
img{max-width:100%}
ul,ol{list-style:none}
button{cursor:pointer;font-family:inherit}
::selection{background:var(--pri-lit);color:var(--pri-dark)}

/* ===== Container ===== */
.container{max-width:var(--w);margin:0 auto;padding:0 28px}

/* ===== Header ===== */
.header{background:var(--bg);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;box-shadow:0 0 0 rgba(0,0,0,0);transition:box-shadow var(--t-md)}
.header.scrolled{box-shadow:var(--shadow-sm)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.header-brand{display:flex;align-items:center;gap:9px;font-size:20px;font-weight:700;color:var(--text);text-decoration:none}
.brand-icon{width:36px;height:36px;background:var(--grad-pri);border-radius:var(--r-sm);display:flex;align-items:center;justify-content:center;color:#fff;font-size:16px;font-weight:700}
.header-nav{display:flex;align-items:center;gap:28px}
.header-nav a{color:var(--text-2);text-decoration:none;font-size:14px;font-weight:500;transition:color var(--t-fast)}
.header-nav a:hover,.header-nav a.active{color:var(--pri)}
.header-nav a.nav-cta{background:var(--pri);color:#fff;padding:10px 20px;border-radius:var(--r-sm);transition:all var(--t-fast)}
.header-nav a.nav-cta:hover{background:var(--pri-dark);box-shadow:var(--shadow-sm);color:#fff}
.menu-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.menu-toggle span{width:22px;height:2px;background:var(--text);border-radius:2px;transition:all .25s ease}
.menu-toggle.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.menu-toggle.active span:nth-child(2){opacity:0}
.menu-toggle.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}

.mobile-nav{display:none;background:var(--bg);border-top:1px solid var(--border);padding:16px 28px}
.mobile-nav a{display:block;padding:12px 0;color:var(--text-2);text-decoration:none;font-size:15px;border-bottom:1px solid var(--bg-3);transition:color var(--t-fast)}
.mobile-nav a:hover{color:var(--pri)}

/* ===== Hero ===== */
.hero{background:linear-gradient(180deg,var(--bg-2) 0%,var(--bg) 100%);padding:80px 0 64px;text-align:center;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:-30%;right:-10%;width:500px;height:500px;background:radial-gradient(circle,rgba(124,58,237,.04) 0%,transparent 60%);border-radius:50%;pointer-events:none}
.hero-badge{display:inline-flex;align-items:center;gap:7px;background:var(--pri-lit);color:var(--pri-dark);padding:6px 15px;border-radius:20px;font-size:13px;font-weight:500;margin-bottom:24px}
.hero-badge .dot{width:7px;height:7px;background:var(--sec);border-radius:50%;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.hero h1{font-size:clamp(30px,5.5vw,50px);font-weight:800;line-height:1.18;margin-bottom:18px;color:var(--text);letter-spacing:-.02em}
.hero h1 .highlight{background:var(--grad-hero);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-desc{font-size:17px;color:var(--text-2);max-width:600px;margin:0 auto 32px;line-height:1.72}
.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* ===== Upload Area (q76 特色) ===== */
.upload-area{background:var(--bg);border:2px dashed var(--border);border-radius:var(--r-lg);padding:64px 40px;text-align:center;margin:32px auto;max-width:720px;transition:all var(--t-md)}
.upload-area:hover{border-color:var(--pri);background:var(--pri-lit)}
.upload-icon{width:80px;height:80px;background:linear-gradient(135deg,var(--pri-lit),var(--bg-2));border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 24px;font-size:36px}
.upload-text{font-size:20px;font-weight:600;color:var(--text);margin-bottom:8px}
.upload-hint{font-size:14px;color:var(--text-3)}

/* ===== Buttons ===== */
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:var(--r-sm);font-size:15px;font-weight:600;text-decoration:none;border:none;cursor:pointer;transition:all var(--t-fast)}
.btn-primary{background:var(--pri);color:#fff;box-shadow:var(--shadow-sm)}
.btn-primary:hover{background:var(--pri-dark);box-shadow:var(--shadow-md);transform:translateY(-1px);color:#fff}
.btn-secondary{background:var(--bg);color:var(--text);border:1px solid var(--border)}
.btn-secondary:hover{background:var(--bg-2);border-color:var(--text-3)}
.btn-success{background:var(--sec);color:#fff}
.btn-success:hover{background:var(--sec-dark)}
.btn-ghost{background:transparent;color:var(--text-2)}
.btn-ghost:hover{background:var(--bg-3)}
.btn-lg{padding:16px 32px;font-size:16px}
.btn-sm{padding:10px 18px;font-size:14px}

/* ===== Section ===== */
.section{padding:60px 0}
.section-header{text-align:center;margin-bottom:48px}
.section-header h2{font-size:clamp(24px,3.5vw,34px);font-weight:700;margin-bottom:12px}
.section-header p{font-size:16px;color:var(--text-2)}

/* ===== Steps ===== */
.steps-section{padding:64px 0;background:var(--bg)}
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;max-width:900px;margin:0 auto}
.step-card{text-align:center;padding:32px 24px;transition:all var(--t-md)}
.step-card:hover{transform:translateY(-4px)}
.step-number{width:48px;height:48px;background:var(--pri);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:700;margin:0 auto 20px;transition:all var(--t-md)}
.step-card:hover .step-number{box-shadow:0 4px 16px rgba(124,58,237,.3)}
.step-card h3{font-size:18px;font-weight:600;margin-bottom:8px}
.step-card p{font-size:14px;color:var(--text-2);line-height:1.65}

/* ===== Features ===== */
.features-section{padding:80px 0;background:var(--bg-2)}
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:22px}
.feature-card{background:var(--bg);border-radius:var(--r-md);padding:32px;box-shadow:var(--shadow-xs);transition:all var(--t-md)}
.feature-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-5px)}
.feature-icon{width:56px;height:56px;background:var(--pri-lit);border-radius:var(--r-sm);display:flex;align-items:center;justify-content:center;font-size:28px;margin-bottom:20px}
.feature-card h3{font-size:18px;font-weight:600;margin-bottom:10px}
.feature-card p{font-size:14px;color:var(--text-2);line-height:1.68}

/* ===== Platforms ===== */
.platforms-section{padding:64px 0;background:var(--bg)}
.platform-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px}
.platform-card{background:var(--bg-2);border-radius:var(--r-md);padding:30px;text-align:center;transition:all var(--t-md);border:1px solid transparent}
.platform-card:hover{background:var(--bg);border-color:var(--pri);box-shadow:var(--shadow-md);transform:translateY(-4px)}
.platform-icon{font-size:42px;margin-bottom:14px}
.platform-card h3{font-size:16px;font-weight:600;margin-bottom:6px}
.platform-card p{font-size:13px;color:var(--text-3);margin-bottom:16px}

/* ===== Friend Links (q76 SEO 特色) ===== */
.friend-links{background:var(--bg-2);border-radius:var(--r-md);padding:32px;margin-top:48px}
.friend-links h3{font-size:16px;font-weight:600;margin-bottom:20px;color:var(--text);display:flex;align-items:center;gap:6px}
.friend-links-grid{display:flex;flex-wrap:wrap;gap:12px}
.friend-links-grid a{color:var(--text-2);text-decoration:none;font-size:13.5px;padding:6px 15px;background:var(--bg);border-radius:20px;border:1px solid var(--border);transition:all var(--t-fast)}
.friend-links-grid a:hover{color:var(--pri);border-color:var(--pri);background:var(--pri-lit)}

/* ===== Page Header ===== */
.page-header{text-align:center;padding:64px 28px 48px;background:linear-gradient(180deg,var(--bg-2),var(--bg))}
.page-header h1{font-size:clamp(28px,5vw,40px);font-weight:800;margin-bottom:12px}
.page-header p{font-size:16px;color:var(--text-2);max-width:520px;margin:0 auto}
.page-header .highlight{background:var(--grad-hero);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}

/* ===== Download Page ===== */
.download-section{padding:60px 0;background:var(--bg-2)}
.download-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:22px;max-width:1000px;margin:0 auto}
.download-card{background:var(--bg);border-radius:var(--r-md);padding:32px;box-shadow:var(--shadow-xs);transition:all var(--t-md);border:1px solid var(--border)}
.download-card:hover{box-shadow:var(--shadow-lg);border-color:var(--pri)}
.download-header{display:flex;align-items:center;gap:16px;margin-bottom:20px}
.download-icon{width:56px;height:56px;border-radius:var(--r-sm);display:flex;align-items:center;justify-content:center;font-size:28px}
.download-icon.win{background:#E3F2FD}
.download-icon.mac{background:#F3E5F5}
.download-icon.linux{background:#FFF3E0}
.download-icon.android{background:#E8F5E9}
.download-icon.ios{background:#ECEFF1}
.download-info h3{font-size:18px;font-weight:600;margin-bottom:4px}
.download-info p{font-size:13px;color:var(--text-3)}
.download-meta{display:flex;gap:16px;margin-bottom:20px;font-size:13px;color:var(--text-2)}
.download-meta span{display:flex;align-items:center;gap:4px}

/* ===== Tags ===== */
.tag{display:inline-block;padding:4px 11px;border-radius:12px;font-size:11.5px;font-weight:500}
.tag-blue{background:#E3F2FD;color:#1565C0}
.tag-green{background:#E8F5E9;color:#be123c}
.tag-purple{background:#F3E5F5;color:#7B1FA2}
.tag-orange{background:#FFF3E0;color:#E65100}

/* ===== FAQ ===== */
.faq-list{max-width:760px;margin:0 auto}
.faq-item{background:var(--bg);border:1px solid var(--border);border-radius:var(--r-md);margin-bottom:10px;overflow:hidden;transition:all var(--t-fast)}
.faq-item:hover{border-color:var(--pri)}
.faq-item[open]{border-color:var(--pri);box-shadow:var(--shadow-sm)}
.faq-item summary{padding:18px 24px;font-weight:600;color:var(--text);cursor:pointer;display:flex;align-items:center;justify-content:space-between;list-style:none;font-size:15px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'+';font-size:18px;color:var(--text-3);transition:transform var(--t-fast)}
.faq-item[open] summary::after{content:'\2212';color:var(--pri)}
.faq-answer{padding:0 24px 20px;font-size:14.5px;color:var(--text-2);line-height:1.8}

/* ===== Content Card ===== */
.content-card{background:var(--bg);border:1px solid var(--border);border-radius:var(--r-md);padding:32px;margin-bottom:16px;transition:all var(--t-fast)}
.content-card:hover{box-shadow:var(--shadow-sm)}
.content-card h2{font-size:20px;font-weight:700;margin-bottom:12px}
.content-card h3{font-size:17px;font-weight:600;margin-bottom:10px}
.content-card p{font-size:14.5px;color:var(--text-2);line-height:1.78;margin-bottom:10px}
.content-card ul{padding-left:20px;margin-bottom:10px}
.content-card li{font-size:14.5px;color:var(--text-2);line-height:1.78;margin-bottom:6px;list-style:disc}
.content-card code{font-family:monospace;font-size:13px;background:var(--bg-3);padding:2px 8px;border-radius:4px;color:var(--pri-dark)}

/* ===== Popup ===== */
.popup-overlay{position:fixed;inset:0;background:rgba(32,33,36,.55);display:none;align-items:center;justify-content:center;z-index:1000;backdrop-filter:blur(4px)}
.popup-overlay.active{display:flex}
.popup{background:var(--bg);border-radius:var(--r-lg);padding:40px;max-width:420px;width:92%;text-align:center;box-shadow:var(--shadow-lg);animation:popIn .3s ease;position:relative}
@keyframes popIn{from{opacity:0;transform:scale(.92) translateY(12px)}to{opacity:1;transform:scale(1) translateY(0)}}
.popup-close{position:absolute;top:16px;right:16px;width:32px;height:32px;border:none;background:var(--bg-3);border-radius:50%;cursor:pointer;font-size:16px;color:var(--text-2);transition:all var(--t-fast);display:flex;align-items:center;justify-content:center}
.popup-close:hover{background:var(--border);color:var(--text)}
.popup-icon{width:68px;height:68px;background:linear-gradient(135deg,var(--pri-lit),var(--bg-2));border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 24px;font-size:32px}
.popup h3{font-size:20px;font-weight:700;margin-bottom:10px}
.popup p{font-size:14.5px;color:var(--text-2);margin-bottom:24px}
.popup-actions{display:flex;gap:12px;justify-content:center}

/* ===== Back to Top ===== */
.back-to-top{position:fixed;bottom:24px;right:24px;width:46px;height:46px;background:var(--bg);border:1px solid var(--border);border-radius:50%;cursor:pointer;font-size:18px;color:var(--text-2);box-shadow:var(--shadow-md);opacity:0;visibility:hidden;transition:all var(--t-md);z-index:99;display:flex;align-items:center;justify-content:center}
.back-to-top.visible{opacity:1;visibility:visible}
.back-to-top:hover{background:var(--pri);border-color:var(--pri);color:#fff;transform:translateY(-2px)}

/* ===== Footer ===== */
.footer{background:var(--bg);border-top:1px solid var(--border);padding:48px 0 24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px;max-width:var(--w);margin-left:auto;margin-right:auto;padding:0 28px}
.footer-brand h3{font-size:19px;font-weight:700;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.footer-brand p{font-size:14px;color:var(--text-2);line-height:1.68;max-width:300px}
.footer-col h4{font-size:13.5px;font-weight:600;margin-bottom:16px;color:var(--text)}
.footer-col ul{list-style:none}
.footer-col li{margin-bottom:10px}
.footer-col a{color:var(--text-2);text-decoration:none;font-size:14px;transition:color var(--t-fast)}
.footer-col a:hover{color:var(--pri)}
.footer-bottom{max-width:var(--w);margin:0 auto;padding:24px 28px 0;border-top:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--text-3)}

/* ===== Responsive ===== */
@media(max-width:768px){
  .header-nav{display:none}
  .menu-toggle{display:flex}
  .mobile-nav.active{display:block}
  .hero{padding:64px 0 48px}.hero h1{font-size:28px}.hero-desc{font-size:15px}
  .steps-grid{grid-template-columns:1fr;gap:20px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .footer-bottom{flex-direction:column;gap:10px;text-align:center}
  .download-grid{grid-template-columns:1fr}
  .upload-area{padding:48px 28px}
}
@media(max-width:480px){
  .hero h1{font-size:24px}
  .section-header h2{font-size:22px}
  .footer-grid{grid-template-columns:1fr}
  .popup{padding:32px 24px}.popup-actions{flex-direction:column}
}

/* ===== q86 审计修复（抽内联 / 图标） ===== */
.q86-mt16{margin-top:16px}
.q86-mw600{max-width:600px}
.q86-ml10{margin-left:10px}
.q86-pt40{padding-top:40px}
.q86-p4060{padding:40px 0 60px}
.q86-flwrap{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-top:28px}
.brand-icon .ti{color:#fff}
.feature-icon .ti,.platform-icon .ti,.upload-icon .ti,.download-icon .ti{color:var(--pri)}