:root {
  --pri: #6366f1;
  --pri-dark: #4f46e5;
  --pri-lit: #a5b4fc;
  --pri-bg: rgba(99,102,241,.1);
  --pri-glow: rgba(99,102,241,.18);

  --acc: #06b6d4;
  --acc-lit: #22d3ee;
  --acc-bg: rgba(6,182,212,.08);

  --bg: #08080B;
  --surface: #101014;
  --surface-2: #18181F;
  --border: rgba(255,255,255,.04);
  --border-2: rgba(255,255,255,.08);

  --text: #EDEDF5;
  --text-2: #9595AA;
  --text-3: #58586E;

  --grad-hero: linear-gradient(135deg, var(--pri), var(--acc));
  --grad-pri: linear-gradient(135deg, #6366f1, #4f46e5);
  --grad-cta: linear-gradient(135deg, rgba(99,102,241,.18), rgba(6,182,212,.1));

  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 18px;
  --r-xl: 26px;

  --shadow-sm: 0 2px 8px rgba(0,0,0,.18);
  --shadow-md: 0 6px 24px rgba(0,0,0,.28);
  --shadow-lg: 0 12px 48px rgba(0,0,0,.38);

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --t-fast: .18s cubic-bezier(.4,0,.2,1);
  --t-md: .3s cubic-bezier(.4,0,.2,1);

  --w: 1180px;
}

*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;font-size:16px}
body{font-family:var(--font);font-size:15px;line-height:1.68;color:var(--text);background:var(--bg);overflow-x:hidden}
a{color:var(--pri-lit);text-decoration:none;transition:color var(--t-fast)}
a:hover{color:var(--acc-lit)}
img{max-width:100%;display:block}
::selection{background:rgba(99,102,241,.25);color:#fff}

/* ===== Header ===== */
.header{position:fixed;top:0;left:0;right:0;z-index:1000;height:64px;display:flex;align-items:center;background:rgba(8,8,11,.76);backdrop-filter:blur(24px) saturate(180%);-webkit-backdrop-filter:blur(24px) saturate(180%);border-bottom:1px solid rgba(99,102,241,.06);transition:all var(--t-md)}
.header.scrolled{background:rgba(8,8,11,.94);border-bottom-color:rgba(99,102,241,.12);box-shadow:0 2px 20px rgba(0,0,0,.3)}
.header-inner{max-width:var(--w);margin:0 auto;padding:0 28px;height:64px;display:flex;align-items:center;gap:32px}
.header-brand{display:flex;align-items:center;gap:9px;font-size:17px;font-weight:800;color:var(--pri-lit);text-decoration:none;flex-shrink:0;letter-spacing:-.3px}
.brand-icon{font-size:18px;width:30px;height:30px;background:var(--grad-pri);border-radius:var(--r-sm);display:flex;align-items:center;justify-content:center;font-size:14px;color:#fff}
.header-nav{display:flex;align-items:center;gap:3px;margin-left:auto}
.header-nav a{color:var(--text-2);text-decoration:none;font-size:13px;padding:7px 14px;border-radius:var(--r-sm);transition:all var(--t-fast);font-weight:500}
.header-nav a:hover{color:#fff;background:rgba(255,255,255,.04)}
.header-nav a.nav-cta{background:var(--grad-pri);color:#fff;font-weight:600;padding:7px 18px;margin-left:6px;box-shadow:0 2px 10px rgba(99,102,241,.22)}
.header-nav a.nav-cta:hover{transform:translateY(-1px);box-shadow:0 4px 16px rgba(99,102,241,.3);color:#fff}
.menu-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px;margin-left:auto}
.menu-toggle span{width:20px;height:2px;background:var(--text);border-radius:1px;transition:all var(--t-md)}

/* ===== Mobile Nav ===== */
.mobile-nav{display:none;flex-direction:column;background:rgba(16,16,20,.97);border-top:1px solid var(--border);padding:10px 0}
.mobile-nav a{color:var(--text-2);text-decoration:none;font-size:15px;padding:14px 28px;border-bottom:1px solid var(--border);transition:all var(--t-fast)}
.mobile-nav a:hover{color:var(--pri);background:rgba(99,102,241,.04)}

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

/* ===== Hero ===== */
.hero{position:relative;min-height:90vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:88px 28px 72px;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:0;background:radial-gradient(ellipse 75% 50% at 50% -5%,rgba(99,102,241,.09) 0%,transparent 55%),radial-gradient(ellipse 45% 35% at 80% 60%,rgba(6,182,212,.04) 0%,transparent 45%);pointer-events:none}
.hero-content{position:relative;z-index:2}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(99,102,241,.08);border:1px solid rgba(99,102,241,.18);color:var(--pri-lit);font-size:12px;font-weight:600;padding:5px 18px;border-radius:20px;margin-bottom:26px}
.hero-badge::before{content:'';width:6px;height:6px;background:var(--pri-lit);border-radius:50%;animation:pls 2s ease-in-out infinite}
@keyframes pls{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.3;transform:scale(.7)}}
.hero-title{font-size:clamp(32px,6.5vw,58px);font-weight:900;color:#fff;line-height:1.06;margin-bottom:22px;letter-spacing:-1.5px}
.gradient-text{background:var(--grad-hero);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-subtitle{font-size:16px;color:var(--text-2);max-width:520px;margin:0 auto 34px;line-height:1.72}
.hero-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:56px}
.hero-stats{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.hero-stat{background:rgba(255,255,255,.02);border:1px solid var(--border);border-radius:var(--r-md);padding:18px 26px;text-align:center;min-width:120px;transition:all var(--t-md)}
.hero-stat:hover{background:rgba(255,255,255,.04);border-color:rgba(99,102,241,.15);transform:translateY(-2px)}
.hero-stat-value{font-size:26px;font-weight:900;color:var(--pri);margin-bottom:3px;line-height:1.1}
.hero-stat-label{font-size:10.5px;color:var(--text-3);font-weight:500;letter-spacing:.3px;text-transform:uppercase}

/* ===== Buttons ===== */
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 24px;border-radius:var(--r-sm);font-size:14px;font-weight:600;text-decoration:none;border:none;cursor:pointer;font-family:inherit;transition:all var(--t-fast);letter-spacing:.2px}
.btn-primary{background:var(--grad-pri);color:#fff;box-shadow:0 2px 10px rgba(99,102,241,.22)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 4px 18px rgba(99,102,241,.32);color:#fff}
.btn-secondary{background:rgba(255,255,255,.05);color:var(--text);border:1.5px solid rgba(255,255,255,.08)}
.btn-secondary:hover{border-color:var(--pri-lit);color:var(--pri-lit);background:rgba(99,102,241,.04)}
.btn-lg{padding:14px 32px;font-size:15.5px;border-radius:var(--r-md)}
.btn-sm{padding:7px 14px;font-size:13px}
.btn-block{width:100%}

/* ===== Section ===== */
.section{padding:96px 0}
.section-alt{background:var(--surface)}
.section-header{text-align:center;margin-bottom:56px}
.section-tag{display:inline-block;background:var(--pri-bg);border:1px solid rgba(99,102,241,.2);color:var(--pri-lit);font-size:11px;font-weight:600;letter-spacing:.5px;text-transform:uppercase;padding:4px 16px;border-radius:100px;margin-bottom:16px}
.section-title{font-size:clamp(22px,3.8vw,34px);font-weight:800;color:#fff;line-height:1.18;margin-bottom:16px;letter-spacing:-.5px}
.section-desc{color:var(--text-2);font-size:14.5px;max-width:520px;margin:0 auto;line-height:1.72}

/* ===== Feature Cards (保留 q74 分色 icon 背景) ===== */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.feature-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:30px 26px;transition:all var(--t-md);position:relative;overflow:hidden}
.feature-card::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,var(--pri),var(--acc));opacity:0;transition:opacity var(--t-md)}
.feature-card:hover{border-color:rgba(99,102,241,.18);transform:translateY(-5px);box-shadow:0 12px 36px rgba(99,102,241,.05)}
.feature-card:hover::before{opacity:1}
.feature-icon{width:46px;height:46px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:16px;color:var(--pri-lit)}
.feature-icon.amber{background:rgba(99,102,241,.14)}
.feature-icon.blue{background:rgba(59,130,246,.14)}
.feature-icon.green{background:rgba(34,197,94,.14)}
.feature-icon.orange{background:rgba(249,115,22,.14)}
.feature-icon.purple{background:rgba(168,85,247,.14)}
.feature-icon.red{background:rgba(239,68,68,.14)}
.feature-title{font-size:16px;font-weight:700;color:#fff;margin-bottom:8px;letter-spacing:-.2px}
.feature-desc{font-size:13.5px;color:var(--text-2);line-height:1.72}
.card-tag{display:inline-block;margin-top:12px;font-size:10.5px;font-weight:600;color:var(--pri-lit);background:var(--pri-bg);padding:3px 10px;border-radius:100px;border:1px solid rgba(99,102,241,.15);letter-spacing:.2px}

@media(max-width:900px){.features-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:580px){.features-grid{grid-template-columns:1fr}}

/* ===== Stats Row (q74 特色) ===== */
.stats-row{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.stat-card{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--r-lg);padding:28px 20px;text-align:center;transition:all var(--t-md)}
.stat-card:hover{border-color:rgba(99,102,241,.2);transform:translateY(-3px);box-shadow:0 8px 28px rgba(99,102,241,.04)}
.stat-icon{font-size:30px;margin-bottom:10px;color:var(--pri-lit)}
.stat-value{font-size:34px;font-weight:900;color:var(--pri);line-height:1.1}
.stat-label{font-size:12px;color:var(--text-2);margin-top:4px}
@media(max-width:768px){.stats-row{grid-template-columns:repeat(2,1fr)}}

/* ===== Platform Cards (q74 特色：直接链接 download.html) ===== */
.platform-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:14px}
.platform-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:30px 16px;text-align:center;text-decoration:none;color:inherit;transition:all var(--t-md);display:block}
.platform-card:hover{border-color:rgba(99,102,241,.25);transform:translateY(-4px);background:var(--surface-2);box-shadow:0 12px 32px rgba(99,102,241,.04)}
.platform-icon{width:56px;height:56px;margin:0 auto 14px;border-radius:16px;background:var(--pri-bg);display:flex;align-items:center;justify-content:center;font-size:28px;color:var(--pri-lit);line-height:1;transition:all var(--t-md)}
.platform-name{font-size:14.5px;font-weight:700;color:#fff;display:block}
.platform-version{font-size:11px;color:var(--text-3);display:block;margin-top:4px}
@media(max-width:900px){.platform-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:580px){.platform-grid{grid-template-columns:repeat(2,1fr)}}

/* ===== Compare Table (q74 特色) ===== */
.compare-table-wrap{overflow-x:auto;border-radius:var(--r-lg);border:1px solid var(--border)}
.compare-table{width:100%;border-collapse:collapse;font-size:13.5px}
.compare-table thead th{background:var(--surface-2);padding:15px 18px;text-align:center;font-size:11px;font-weight:700;color:var(--pri-lit);border-bottom:1px solid var(--border);white-space:nowrap;letter-spacing:.3px}
.compare-table tbody tr{border-bottom:1px solid var(--border);transition:background var(--t-fast)}
.compare-table tbody tr:hover{background:rgba(99,102,241,.025)}
.compare-table tbody td{padding:13px 18px;color:var(--text-2);text-align:center}
.compare-table tbody td:first-child{font-weight:600;color:#fff;text-align:left}
.compare-check{color:#34d399;font-size:17px;font-weight:700}
.compare-cross{color:var(--text-3)}

/* ===== Steps (q74 特色：连接线) ===== */
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;position:relative}
.steps-grid::before{content:'';position:absolute;top:28px;left:calc(16.67% + 18px);right:calc(16.67% + 18px);height:1px;background:linear-gradient(90deg,transparent,rgba(99,102,241,.2),transparent)}
.step-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:34px 26px;position:relative;transition:all var(--t-md)}
.step-card:hover{border-color:rgba(99,102,241,.15);transform:translateY(-3px)}
.step-number{width:46px;height:46px;border-radius:50%;background:var(--grad-pri);color:#fff;font-size:18px;font-weight:900;display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.step-title{font-size:16.5px;font-weight:700;color:#fff;margin-bottom:10px}
.step-desc{font-size:13.5px;color:var(--text-2);line-height:1.72}
@media(max-width:768px){.steps-grid{grid-template-columns:1fr}.steps-grid::before{display:none}}

/* ===== CTA Box (q74 特色) ===== */
.cta-box{background:var(--grad-pri);border:1px solid rgba(99,102,241,.2);border-radius:var(--r-lg);padding:56px 40px;text-align:center;box-shadow:var(--shadow-lg)}
.cta-box h2{font-size:28px;font-weight:800;color:#fff;margin-bottom:12px;letter-spacing:-.3px}
.cta-box p{color:var(--text-2);margin-bottom:28px;font-size:14.5px}
@media(max-width:580px){.cta-box{padding:36px 20px}}

/* ===== FAQ (q74 特色：details/summary 手风琴) ===== */
.faq-list{max-width:720px;margin:0 auto;display:flex;flex-direction:column;gap:8px}
.faq-item{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--r-sm);overflow:hidden;transition:border-color var(--t-fast)}
.faq-item[open]{border-color:rgba(99,102,241,.2)}
.faq-item summary{padding:20px 26px;font-weight:600;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;font-size:14.5px;color:var(--text)}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'+';font-size:18px;color:var(--pri-lit);transition:transform var(--t-fast);font-weight:300}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item[open] summary{color:var(--pri-lit)}
.faq-answer{padding:0 26px 20px;font-size:13.5px;color:var(--text-2);line-height:1.85;border-top:1px solid var(--border);padding-top:16px}

/* ===== Friend Links (q74 特色：SEO 关键词导航) ===== */
.friend-links{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:36px}
.friend-links h3{font-size:10.5px;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:var(--text-3);margin-bottom:20px}
.friend-links-grid{display:flex;flex-wrap:wrap;gap:8px}
.friend-links-grid a{font-size:12.5px;color:var(--text-2);text-decoration:none;background:var(--surface-2);border:1px solid var(--border);padding:5px 14px;border-radius:100px;transition:all var(--t-fast)}
.friend-links-grid a:hover{color:var(--pri-lit);border-color:rgba(99,102,241,.25);background:rgba(99,102,241,.04)}

/* ===== Divider ===== */
.divider{height:1px;background:var(--border);margin:0 28px}

/* ===== Footer ===== */
.footer{position:relative;background:#060608;border-top:1px solid var(--border);padding:56px 0 24px}
.footer::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--grad-pri)}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;max-width:var(--w);margin:0 auto 40px;padding:0 28px}
.footer-brand h3{font-size:17px;font-weight:800;color:var(--pri-lit);margin-bottom:12px}
.footer-brand p{font-size:13px;color:var(--text-3);max-width:300px;line-height:1.75}
.footer-col h4{font-size:10.5px;font-weight:700;text-transform:uppercase;letter-spacing:1.2px;color:rgba(255,255,255,.12);margin-bottom:16px}
.footer-col ul{list-style:none}
.footer-col li{margin-bottom:8px}
.footer-col a{color:var(--text-3);text-decoration:none;font-size:13px;transition:all var(--t-fast)}
.footer-col a:hover{color:var(--pri-lit);transform:translateX(2px)}
.footer-bottom{max-width:var(--w);margin:0 auto;padding:20px 28px 0;border-top:1px solid var(--border);font-size:11px;color:var(--text-3);display:flex;justify-content:space-between;align-items:center}
.footer-bottom a{color:var(--text-3);transition:color var(--t-fast)}
.footer-bottom a:hover{color:var(--pri-lit)}
.footer-disclaimer{max-width:var(--w);margin:0 auto;padding:12px 28px 0;font-size:11px;color:var(--text-3)}
@media(max-width:768px){.footer-grid{grid-template-columns:repeat(2,1fr);gap:28px}}
@media(max-width:480px){.footer-grid{grid-template-columns:1fr}.footer-bottom{flex-direction:column;gap:10px;text-align:center}}

/* ===== Scroll Top ===== */
#scrollTop{position:fixed;bottom:24px;right:24px;width:42px;height:42px;border-radius:var(--r-sm);background:var(--grad-pri);color:#fff;border:none;cursor:pointer;font-size:14px;display:none;align-items:center;justify-content:center;transition:all var(--t-fast);z-index:999;box-shadow:0 4px 14px rgba(99,102,241,.2)}
#scrollTop.visible{display:flex}
#scrollTop:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(99,102,241,.3)}

/* ===== Fade In ===== */
.fade-in{opacity:0;transform:translateY(18px);transition:opacity .5s ease,transform .5s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}

/* ===== Modal (q74 特色：进度条) ===== */
.modal-overlay{display:none;position:fixed;inset:0;z-index:2000;background:rgba(0,0,0,.6);backdrop-filter:blur(6px);align-items:center;justify-content:center;padding:20px}
.modal-overlay.open{display:flex}
.modal{background:var(--surface-2);border:1px solid rgba(99,102,241,.15);border-radius:var(--r-lg);padding:38px;max-width:420px;width:92%;text-align:center;position:relative;box-shadow:0 24px 60px rgba(0,0,0,.5);animation:modal-in .3s cubic-bezier(.34,1.56,.64,1)}
@keyframes modal-in{from{opacity:0;transform:scale(.9) translateY(18px)}to{opacity:1;transform:scale(1) translateY(0)}}
.modal-close{position:absolute;top:14px;right:14px;background:none;border:none;color:var(--text-3);font-size:16px;cursor:pointer;padding:4px 8px;transition:color var(--t-fast)}
.modal-close:hover{color:#fff}
.modal-icon{font-size:42px;margin-bottom:14px}
.modal h3{font-size:18px;font-weight:800;color:#fff;margin-bottom:6px}
.modal>p{color:var(--text-2);font-size:13.5px;margin-bottom:8px}
.modal-version{font-size:12px;color:var(--pri-lit);font-weight:600;margin-bottom:20px}
.modal-progress{height:4px;background:rgba(255,255,255,.06);border-radius:2px;overflow:hidden;margin-bottom:12px}
.modal-progress-bar{height:100%;background:linear-gradient(90deg,var(--pri),var(--acc));width:0;border-radius:2px;transition:width .1s linear}
.modal-hint{font-size:12px;color:var(--text-3)}

/* ===== Card (通用) ===== */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:32px}

/* ===== Info Box ===== */
.info-box{background:var(--pri-bg);border:1px solid rgba(99,102,241,.15);border-radius:var(--r-md);padding:18px 22px;font-size:13.5px;color:var(--text-2);line-height:1.75}
.info-box strong{color:var(--pri-lit)}

/* ===== Responsive ===== */
@media(max-width:768px){
  .header-nav{display:none}
  .menu-toggle{display:flex}
  .mobile-nav.open{display:flex}
  .hero{min-height:auto;padding:72px 20px 52px}.hero-title{font-size:28px}
  .hero-stats{gap:8px}.hero-stat{padding:14px 16px;min-width:90px}.hero-stat-value{font-size:20px}
  .hero-actions{flex-direction:column;align-items:center}
  .section{padding:64px 0}
}
@media(max-width:480px){
  .hero-title{font-size:24px}
  .hero-stat{padding:12px 14px;min-width:70px}.hero-stat-value{font-size:18px}
  .hero-stat-label{font-size:9.5px}
}

/* ===== 抽离内联样式（q84 审计修复 · 铁律#17） ===== */
.q84-white-400{color:#fff;font-weight:400}
.q84-flex1-jc{flex:1;justify-content:center}
.q84-pri-lit{color:var(--pri-lit)}
.q84-flex-gap10{display:flex;gap:10px;margin-top:20px}
.q84-hero-pad{min-height:auto;padding:80px 28px 60px}
.q84-clamp-2848{font-size:clamp(28px,5vw,48px)}
.q84-pt0{padding-top:0}
.q84-meta-row{color:var(--text-3);padding:4px 0}
.q84-sub-h{font-size:16px;font-weight:700;margin:24px 0 12px}
.q84-text-185{color:var(--text-2);line-height:1.85}
.q84-mb24{margin-bottom:24px}
.q84-mb28{margin-bottom:28px}
.q84-center-480{margin:0 auto;max-width:480px;text-align:center}
.q84-icon-60{border-radius:14px;font-size:36px;height:60px;margin:0 auto 12px;width:60px}
.q84-mt16-w100{margin-top:16px;width:100%}
.q84-mt32{margin-top:32px}
.q84-table-13{border-collapse:collapse;color:var(--text-2);font-size:13px;margin-top:12px;width:100%}
.q84-td-label{color:var(--text-3);padding:4px 0;width:100px}
.q84-fs13-mt8{font-size:13px;margin-top:8px}
.q84-cap-115{color:var(--text-3);font-size:11.5px;margin-bottom:6px}
.q84-tc{text-align:center}
.q84-fs32{font-size:32px;margin:0 auto 12px}
.q84-mt14-w100{margin-top:14px;width:100%}
.q84-mt24{margin-top:24px}
.q84-p0{padding:0}
.q84-lead-600{color:var(--text-2);line-height:1.75;margin:0 auto 28px;max-width:600px;text-align:center}