/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:#1e293b;background:#fff;line-height:1.7;font-size:16px;overflow-x:hidden}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{cursor:pointer;border:none;background:none;font:inherit;color:inherit}
ul,ol{list-style:none}
h1,h2,h3,h4{line-height:1.3;font-weight:700}

/* ===== Container ===== */
.container{max-width:1180px;margin:0 auto;padding:0 24px}

/* ===== Header ===== */
.g-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid #e2e8f0;transition:box-shadow .3s}
.g-header.scrolled{box-shadow:0 2px 20px rgba(0,0,0,.06)}
.g-header .container{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo-link{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;color:#0f172a}
.logo-link svg{flex-shrink:0}
.logo-link .logo-sub{display:block;font-size:11px;font-weight:400;color:#64748b;margin-top:1px}
.g-nav{display:flex;align-items:center;gap:6px}
.g-nav a{padding:8px 14px;border-radius:8px;font-size:14px;color:#475569;transition:background .2s,color .2s}
.g-nav a:hover,.g-nav a.current{background:#f1f5f9;color:#0f172a}
.g-nav .nav-download{background:#2563eb;color:#fff;font-weight:600;padding:8px 20px}
.g-nav .nav-download:hover{background:#1d4ed8}
.hamburger{display:none;width:40px;height:40px;align-items:center;justify-content:center;border-radius:8px}
.hamburger:hover{background:#f1f5f9}
.mobile-menu{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;border-bottom:1px solid #e2e8f0;padding:12px 24px;box-shadow:0 8px 24px rgba(0,0,0,.08)}
.mobile-menu.open{display:block}
.mobile-menu a{display:block;padding:12px 0;font-size:15px;color:#334155;border-bottom:1px solid #f1f5f9}
.mobile-menu a:last-child{border-bottom:none}

/* ===== Hero (index) ===== */
.hero-home{padding:80px 0 60px;background:linear-gradient(135deg,#eff6ff 0%,#f0fdf4 50%,#fefce8 100%);position:relative;overflow:hidden}
.hero-home::after{content:"";position:absolute;top:-60%;right:-20%;width:600px;height:600px;background:radial-gradient(circle,rgba(37,99,235,.07) 0%,transparent 70%);border-radius:50%;pointer-events:none}
.hero-grid{display:grid;grid-template-columns:1fr 420px;gap:60px;align-items:center}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid #e2e8f0;border-radius:100px;padding:6px 16px;font-size:13px;color:#475569;margin-bottom:20px}
.hero-badge .dot{width:8px;height:8px;border-radius:50%;background:#22c55e;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.hero-home h1{font-size:42px;line-height:1.25;margin-bottom:18px;color:#0f172a}
.hero-home h1 em{font-style:normal;color:#2563eb}
.hero-home .hero-desc{font-size:17px;color:#475569;margin-bottom:30px;max-width:540px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:28px}
.hero-stats{display:flex;gap:32px;flex-wrap:wrap}
.hero-stats .stat-item{display:flex;align-items:center;gap:8px;font-size:13px;color:#64748b}
.hero-stats .stat-item svg{color:#2563eb}
.hero-visual{position:relative}
.hero-card{background:#fff;border-radius:16px;padding:28px;box-shadow:0 4px 30px rgba(0,0,0,.07);border:1px solid #e2e8f0}
.hero-card-head{display:flex;align-items:center;gap:14px;margin-bottom:20px}
.hero-card-head h3{font-size:18px;color:#0f172a}
.hero-card-head p{font-size:13px;color:#64748b}
.capability-list{display:flex;flex-direction:column;gap:14px}
.capability-row{display:flex;align-items:center;gap:12px;padding:10px 14px;background:#f8fafc;border-radius:10px;transition:background .2s}
.capability-row:hover{background:#eff6ff}
.capability-row .cap-icon{width:36px;height:36px;border-radius:8px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.capability-row .cap-icon.blue{background:#dbeafe;color:#2563eb}
.capability-row .cap-icon.green{background:#dcfce7;color:#16a34a}
.capability-row .cap-icon.amber{background:#fef3c7;color:#d97706}
.capability-row .cap-icon.rose{background:#ffe4e6;color:#e11d48}
.capability-row strong{font-size:14px;color:#0f172a}
.capability-row span{font-size:13px;color:#64748b;display:block}
.progress-bar-wrap{margin-top:20px;padding-top:16px;border-top:1px solid #e2e8f0}
.progress-label{display:flex;justify-content:space-between;font-size:13px;color:#475569;margin-bottom:8px}
.progress-track{height:8px;background:#e2e8f0;border-radius:99px;overflow:hidden}
.progress-fill{height:100%;background:linear-gradient(90deg,#2563eb,#3b82f6);border-radius:99px;transition:width 1.2s ease}

/* ===== Buttons ===== */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 24px;border-radius:10px;font-size:15px;font-weight:600;transition:all .25s;cursor:pointer;border:none}
.btn-primary{background:#2563eb;color:#fff}
.btn-primary:hover{background:#1d4ed8;transform:translateY(-1px);box-shadow:0 4px 16px rgba(37,99,235,.3)}
.btn-outline{background:#fff;color:#2563eb;border:1.5px solid #2563eb}
.btn-outline:hover{background:#eff6ff}
.btn-dark{background:#0f172a;color:#fff}
.btn-dark:hover{background:#1e293b}
.btn-ghost{background:transparent;color:#475569;border:1.5px solid #e2e8f0}
.btn-ghost:hover{background:#f8fafc;border-color:#cbd5e1}
.btn.is-loading{opacity:.7;pointer-events:none}
.btn .spinner{animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ===== Section Base ===== */
.g-section{padding:80px 0}
.g-section.bg-slate{background:#f8fafc}
.g-section.bg-dark{background:#0f172a;color:#e2e8f0}
.g-section.bg-dark h2,.g-section.bg-dark h3{color:#f8fafc}
.g-section.bg-dark p{color:#94a3b8}
.section-header{text-align:center;max-width:680px;margin:0 auto 50px}
.section-header .overline{display:inline-block;font-size:13px;font-weight:600;color:#2563eb;text-transform:uppercase;letter-spacing:.5px;margin-bottom:10px}
.section-header h2{font-size:32px;margin-bottom:14px}
.section-header p{font-size:16px;color:#64748b}
.bg-dark .section-header .overline{color:#60a5fa}
.bg-dark .section-header p{color:#94a3b8}

/* ===== Feature Grid (6 items) ===== */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-box{background:#fff;border:1px solid #e2e8f0;border-radius:14px;padding:28px;transition:transform .25s,box-shadow .25s}
.feature-box:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.07)}
.feature-box .f-icon{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.feature-box .f-icon.blue{background:#dbeafe;color:#2563eb}
.feature-box .f-icon.green{background:#dcfce7;color:#16a34a}
.feature-box .f-icon.amber{background:#fef3c7;color:#d97706}
.feature-box .f-icon.rose{background:#ffe4e6;color:#e11d48}
.feature-box .f-icon.indigo{background:#e0e7ff;color:#4f46e5}
.feature-box .f-icon.teal{background:#ccfbf1;color:#0d9488}
.feature-box h3{font-size:17px;margin-bottom:8px;color:#0f172a}
.feature-box p{font-size:14px;color:#64748b;line-height:1.7}

/* ===== Persona Section ===== */
.persona-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.persona-card{border-radius:14px;padding:30px;border:1px solid #e2e8f0;position:relative;overflow:hidden}
.persona-card::before{content:"";position:absolute;top:0;left:0;right:0;height:4px}
.persona-card.dev::before{background:#2563eb}
.persona-card.biz::before{background:#16a34a}
.persona-card.student::before{background:#d97706}
.persona-tag{display:inline-block;font-size:12px;font-weight:600;padding:4px 12px;border-radius:100px;margin-bottom:14px}
.persona-card.dev .persona-tag{background:#dbeafe;color:#2563eb}
.persona-card.biz .persona-tag{background:#dcfce7;color:#16a34a}
.persona-card.student .persona-tag{background:#fef3c7;color:#d97706}
.persona-card h3{font-size:18px;margin-bottom:10px}
.persona-card p{font-size:14px;color:#64748b;margin-bottom:16px}
.persona-list{display:flex;flex-direction:column;gap:8px}
.persona-list li{display:flex;align-items:flex-start;gap:8px;font-size:14px;color:#334155}
.persona-list li svg{flex-shrink:0;margin-top:3px}

/* ===== Security Section ===== */
.security-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.security-features{display:flex;flex-direction:column;gap:20px}
.sec-item{display:flex;gap:16px;align-items:flex-start}
.sec-item .sec-icon{width:44px;height:44px;border-radius:10px;background:rgba(96,165,250,.15);display:flex;align-items:center;justify-content:center;flex-shrink:0;color:#60a5fa}
.sec-item h3{font-size:16px;color:#f8fafc;margin-bottom:4px}
.sec-item p{font-size:14px;color:#94a3b8}
.security-panel{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.08);border-radius:16px;padding:30px}
.security-panel h3{font-size:20px;margin-bottom:12px}
.sec-check-list{display:flex;flex-direction:column;gap:12px}
.sec-check{display:flex;align-items:center;gap:10px;font-size:14px;color:#cbd5e1}
.sec-check svg{color:#22c55e;flex-shrink:0}

/* ===== Timeline ===== */
.timeline{display:flex;flex-direction:column;gap:0;position:relative;max-width:700px;margin:0 auto}
.timeline::before{content:"";position:absolute;left:23px;top:0;bottom:0;width:2px;background:#e2e8f0}
.timeline-item{display:flex;gap:20px;padding:24px 0;position:relative}
.timeline-dot{width:48px;height:48px;border-radius:50%;background:#fff;border:2px solid #2563eb;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:16px;font-weight:700;color:#2563eb;z-index:1}
.timeline-body h3{font-size:17px;margin-bottom:6px;color:#0f172a}
.timeline-body p{font-size:14px;color:#64748b}

/* ===== FAQ ===== */
.faq-list{max-width:780px;margin:0 auto;display:flex;flex-direction:column;gap:10px}
.faq-block{background:#fff;border:1px solid #e2e8f0;border-radius:12px;overflow:hidden;transition:box-shadow .2s}
.faq-block.active{box-shadow:0 4px 20px rgba(0,0,0,.06);border-color:#cbd5e1}
.faq-btn{width:100%;display:flex;align-items:center;justify-content:space-between;padding:18px 22px;font-size:15px;font-weight:600;color:#0f172a;text-align:left;gap:12px}
.faq-btn .faq-num{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:8px;background:#eff6ff;color:#2563eb;font-size:13px;font-weight:700;flex-shrink:0;margin-right:8px}
.faq-btn .chevron-icon{transition:transform .3s;flex-shrink:0;color:#94a3b8}
.faq-block.active .chevron-icon{transform:rotate(180deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-answer-inner{padding:0 22px 20px;font-size:14px;color:#475569;line-height:1.8;padding-left:60px}
.bg-slate .faq-block{background:#fff}

/* ===== CTA Banner ===== */
.cta-banner{background:linear-gradient(135deg,#2563eb 0%,#1d4ed8 50%,#1e40af 100%);border-radius:20px;padding:60px 48px;text-align:center;color:#fff;position:relative;overflow:hidden}
.cta-banner::before{content:"";position:absolute;top:-50%;right:-20%;width:400px;height:400px;background:radial-gradient(circle,rgba(255,255,255,.1) 0%,transparent 70%);border-radius:50%}
.cta-banner h2{font-size:30px;margin-bottom:14px;position:relative}
.cta-banner p{font-size:16px;opacity:.85;margin-bottom:28px;position:relative}
.cta-banner .btn{position:relative}

/* ===== Footer ===== */
.g-footer{background:#0f172a;color:#94a3b8;padding:40px 0 28px;font-size:13px;line-height:1.8}
.footer-inner{text-align:center}
.footer-inner .verify-line{color:#22c55e;margin-bottom:10px;font-size:14px}
.footer-inner .copyright{color:#64748b}
.footer-links{display:flex;justify-content:center;gap:20px;margin-bottom:16px;flex-wrap:wrap}
.footer-links a{color:#94a3b8;transition:color .2s}
.footer-links a:hover{color:#e2e8f0}

/* ===== Download Hero ===== */
.hero-download{padding:70px 0 50px;background:linear-gradient(135deg,#0f172a 0%,#1e293b 100%);color:#fff;text-align:center;position:relative;overflow:hidden}
.hero-download::after{content:"";position:absolute;bottom:-50%;left:50%;transform:translateX(-50%);width:800px;height:400px;background:radial-gradient(ellipse,rgba(37,99,235,.15) 0%,transparent 70%);pointer-events:none}
.hero-download h1{font-size:36px;margin-bottom:14px;position:relative}
.hero-download .hero-desc{font-size:16px;color:#94a3b8;max-width:600px;margin:0 auto 10px;position:relative}

/* ===== Platform Cards ===== */
.platform-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;max-width:900px;margin:0 auto}
.platform-card{background:#fff;border:1px solid #e2e8f0;border-radius:16px;padding:32px;text-align:center;transition:transform .25s,box-shadow .25s;position:relative}
.platform-card:hover{transform:translateY(-4px);box-shadow:0 12px 36px rgba(0,0,0,.08)}
.platform-card.featured{border-color:#2563eb;box-shadow:0 0 0 1px #2563eb}
.platform-card.featured::after{content:"推荐";position:absolute;top:16px;right:16px;background:#2563eb;color:#fff;font-size:12px;font-weight:600;padding:4px 12px;border-radius:100px}
.platform-card .p-icon{width:56px;height:56px;border-radius:14px;display:flex;align-items:center;justify-content:center;margin:0 auto 16px}
.platform-card .p-icon.win{background:#dbeafe;color:#2563eb}
.platform-card .p-icon.mac{background:#f3f4f6;color:#374151}
.platform-card .p-icon.ios{background:#e0e7ff;color:#4f46e5}
.platform-card .p-icon.android{background:#dcfce7;color:#16a34a}
.platform-card h3{font-size:19px;margin-bottom:6px;color:#0f172a}
.platform-card .p-desc{font-size:14px;color:#64748b;margin-bottom:18px}
.platform-card .p-meta{display:flex;justify-content:center;gap:16px;font-size:12px;color:#94a3b8;margin-top:14px}

/* ===== Windows Featured Card ===== */
.win-featured{grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;text-align:left;padding:40px}
.win-featured .p-icon{margin:0 0 16px}
.win-steps{display:flex;flex-direction:column;gap:14px}
.win-step{display:flex;gap:12px;align-items:flex-start}
.win-step .step-num{width:28px;height:28px;border-radius:50%;background:#eff6ff;color:#2563eb;font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.win-step p{font-size:14px;color:#475569}

/* ===== System Requirements ===== */
.req-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;max-width:800px;margin:0 auto}
.req-item{display:flex;gap:14px;padding:20px;background:#fff;border:1px solid #e2e8f0;border-radius:12px}
.req-item .req-icon{width:40px;height:40px;border-radius:10px;background:#eff6ff;display:flex;align-items:center;justify-content:center;flex-shrink:0;color:#2563eb}
.req-item strong{font-size:14px;color:#0f172a;display:block;margin-bottom:2px}
.req-item span{font-size:13px;color:#64748b}

/* ===== Scroll Reveal ===== */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
.reveal.visible{opacity:1;transform:translateY(0)}

/* ===== Responsive ===== */
@media(max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .hero-visual{order:-1}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .persona-grid{grid-template-columns:1fr}
  .security-grid{grid-template-columns:1fr}
  .platform-grid{grid-template-columns:1fr}
  .win-featured{grid-template-columns:1fr}
  .req-grid{grid-template-columns:1fr}
}
@media(max-width:768px){
  .g-nav{display:none}
  .hamburger{display:flex}
  .hero-home{padding:50px 0 40px}
  .hero-home h1{font-size:28px}
  .hero-download h1{font-size:26px}
  .feature-grid{grid-template-columns:1fr}
  .section-header h2{font-size:24px}
  .g-section{padding:50px 0}
  .cta-banner{padding:40px 24px}
  .cta-banner h2{font-size:24px}
  .hero-stats{gap:16px}
  .faq-answer-inner{padding-left:22px}
}