/* ===== 星河杀毒 - 官网样式 ===== */
:root{
  --bg:#060818;
  --bg2:#0a0e27;
  --panel:rgba(20,26,60,.55);
  --panel-solid:#0d1230;
  --border:rgba(120,130,220,.18);
  --border-strong:rgba(140,150,255,.35);
  --text:#e8eaff;
  --text-dim:#9a9ec8;
  --text-faint:#6a6e90;
  --accent:#6c5cff;
  --accent2:#a855ff;
  --accent3:#00d4ff;
  --good:#00e0a0;
  --warn:#ffb020;
  --radius:16px;
  --shadow:0 20px 60px rgba(0,0,0,.5);
  --maxw:1140px;
  --ease:cubic-bezier(.22,1,.36,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Noto Sans SC',-apple-system,BlinkMacSystemFont,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  overflow-x:hidden;
  min-height:100vh;
}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input{font-family:inherit}

/* ===== 星空背景 ===== */
#starfield{position:fixed;inset:0;z-index:0;pointer-events:none}
.nebula{position:fixed;border-radius:50%;filter:blur(90px);opacity:.4;z-index:0;pointer-events:none;animation:float 18s var(--ease) infinite alternate}
.nebula-1{width:520px;height:520px;background:radial-gradient(circle,#4a3aff,transparent 70%);top:-120px;right:-80px;animation-delay:0s}
.nebula-2{width:420px;height:420px;background:radial-gradient(circle,#a855ff,transparent 70%);bottom:200px;left:-100px;animation-delay:-6s}
.nebula-3{width:360px;height:360px;background:radial-gradient(circle,#00d4ff,transparent 70%);top:50%;right:30%;opacity:.25;animation-delay:-12s}
@keyframes float{from{transform:translate(0,0)}to{transform:translate(40px,-30px)}}

/* ===== 导航 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;backdrop-filter:blur(14px);background:rgba(6,8,24,.6);border-bottom:1px solid var(--border)}
.nav-inner{max-width:var(--maxw);margin:auto;padding:16px 24px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:8px;font-weight:900;font-size:18px}
.brand-mark{color:var(--accent3);font-size:22px;filter:drop-shadow(0 0 8px rgba(0,212,255,.6))}
.nav-links{display:flex;gap:28px}
.nav-links a{color:var(--text-dim);font-size:14px;font-weight:500;transition:color .2s}
.nav-links a:hover{color:var(--text)}
.btn-ghost{padding:8px 20px;border:1px solid var(--border-strong);border-radius:30px;font-size:14px;font-weight:600;color:var(--text);transition:all .25s var(--ease)}
.btn-ghost:hover{background:var(--accent);border-color:var(--accent);box-shadow:0 0 24px rgba(108,92,255,.5)}

/* ===== 通用按钮 ===== */
.btn-primary{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 30px;border-radius:30px;font-size:15px;font-weight:700;color:#fff;background:linear-gradient(135deg,var(--accent),var(--accent2));box-shadow:0 8px 30px rgba(108,92,255,.45);transition:transform .25s var(--ease),box-shadow .25s;position:relative;overflow:hidden}
.btn-primary::after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,#fff2,transparent);opacity:0;transition:opacity .25s}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 40px rgba(108,92,255,.6)}
.btn-primary:hover::after{opacity:1}
.btn-primary:active{transform:translateY(0)}
.btn-primary:disabled{opacity:.4;cursor:not-allowed;transform:none;box-shadow:none}
.btn-primary.full{width:100%;padding:16px}
.btn-primary.big{padding:18px 44px;font-size:16px}
.btn-text{color:var(--text-dim);font-size:14px;font-weight:600;transition:color .2s}
.btn-text:hover{color:var(--text)}

/* ===== 渐变文字 ===== */
.grad{background:linear-gradient(120deg,#6c9bff,#a855ff,#00d4ff);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ===== 首屏 ===== */
.hero{position:relative;z-index:2;min-height:100vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:120px 24px 140px}
.hero-inner{max-width:760px}
.badge{display:inline-block;padding:7px 18px;border:1px solid var(--border-strong);border-radius:30px;font-size:13px;font-weight:600;color:var(--accent3);background:rgba(0,212,255,.08);margin-bottom:28px;backdrop-filter:blur(8px);animation:pulse 2.4s ease infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(0,212,255,.3)}50%{box-shadow:0 0 0 12px rgba(0,212,255,0)}}
.hero-title{font-size:clamp(48px,9vw,92px);font-weight:900;letter-spacing:-2px;line-height:1;margin-bottom:18px}
.hero-sub{font-size:clamp(16px,2.4vw,22px);font-weight:500;color:var(--text);margin-bottom:14px}
.hero-desc{font-size:15px;color:var(--text-dim);max-width:560px;margin:0 auto 36px}
.hero-cta{display:flex;gap:24px;justify-content:center;align-items:center;flex-wrap:wrap;margin-bottom:60px}
.hero-stats{display:flex;align-items:center;justify-content:center;gap:0;flex-wrap:wrap}
.stat{display:flex;flex-direction:column;align-items:center;padding:0 32px}
.stat-num{font-size:28px;font-weight:900;color:var(--accent3)}
.stat-label{font-size:13px;color:var(--text-faint);margin-top:4px}
.stat-sep{width:1px;height:40px;background:var(--border)}
.scroll-hint{position:absolute;bottom:24px;left:50%;transform:translateX(-50%);display:flex;flex-direction:column;align-items:center;gap:10px;color:var(--text-faint);font-size:12px;pointer-events:none}
.scroll-line{width:1px;height:40px;background:linear-gradient(var(--accent3),transparent);animation:scrollDown 2s ease infinite}
@keyframes scrollDown{0%{transform:scaleY(0);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}51%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}

/* ===== 区块通用 ===== */
.section-head{text-align:center;max-width:680px;margin:0 auto 56px;padding:0 24px}
.section-tag{display:inline-block;font-size:13px;font-weight:600;color:var(--accent3);letter-spacing:2px;text-transform:uppercase;margin-bottom:14px}
.section-title{font-size:clamp(30px,5vw,46px);font-weight:900;letter-spacing:-1px;margin-bottom:14px}
.section-desc{font-size:15px;color:var(--text-dim)}

/* ===== 特性区 ===== */
.features{position:relative;z-index:2;max-width:var(--maxw);margin:0 auto;padding:100px 24px}
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.feature-card{position:relative;padding:32px 26px;background:var(--panel);backdrop-filter:blur(16px);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:transform .4s var(--ease),border-color .3s;opacity:0;transform:translateY(30px)}
.feature-card.in{opacity:1;transform:translateY(0);transition-delay:calc(var(--i)*100ms)}
.feature-card:hover{transform:translateY(-6px);border-color:var(--border-strong)}
.feature-card::before{content:"";position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,transparent,var(--accent),transparent);opacity:0;transition:opacity .3s}
.feature-card:hover::before{opacity:1}
.feature-icon{width:54px;height:54px;border-radius:14px;display:flex;align-items:center;justify-content:center;margin-bottom:20px;color:#fff}
.icon-free{background:linear-gradient(135deg,#00e0a0,#00a0ff)}
.icon-privacy{background:linear-gradient(135deg,#6c5cff,#a855ff)}
.icon-fast{background:linear-gradient(135deg,#ffb020,#ff6090)}
.icon-clean{background:linear-gradient(135deg,#00d4ff,#6c5cff)}
.feature-card h3{font-size:19px;font-weight:700;margin-bottom:10px}
.feature-card p{font-size:13.5px;color:var(--text-dim);line-height:1.7}
.feature-num{position:absolute;top:20px;right:24px;font-size:46px;font-weight:900;color:rgba(120,130,220,.08);line-height:1}

/* ===== 预览区 ===== */
.preview{position:relative;z-index:2;max-width:920px;margin:0 auto;padding:80px 24px 100px}
.preview-frame{background:var(--panel-solid);border:1px solid var(--border);border-radius:18px;overflow:hidden;box-shadow:var(--shadow)}
.window-bar{display:flex;align-items:center;gap:8px;padding:14px 18px;background:rgba(255,255,255,.03);border-bottom:1px solid var(--border)}
.dot{width:12px;height:12px;border-radius:50%}
.dot-r{background:#ff5f57}.dot-y{background:#febc2e}.dot-g{background:#28c840}
.window-title{margin-left:auto;font-size:13px;color:var(--text-faint)}
.window-body{padding:40px 32px;display:flex;flex-direction:column;align-items:center;gap:28px}
.scan-view{width:100%;display:flex;flex-direction:column;align-items:center;gap:28px;animation:fadeView .4s var(--ease)}
@keyframes fadeView{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.scan-ring{position:relative;width:220px;height:220px}
.scan-ring svg{transform:rotate(-90deg)}
.ring-bg{fill:none;stroke:rgba(120,130,220,.15);stroke-width:8}
.ring-fg{fill:none;stroke:var(--good);stroke-width:8;stroke-linecap:round;stroke-dasharray:578;stroke-dashoffset:0;animation:ringDraw 2.5s var(--ease)}
@keyframes ringDraw{from{stroke-dashoffset:578}}
.scan-center{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px}
.scan-shield{font-size:44px;filter:drop-shadow(0 0 16px rgba(0,224,160,.5))}
.scan-status{font-size:18px;font-weight:700;color:var(--good)}
.scan-sub{font-size:13px;color:var(--text-faint)}
.scan-info{display:flex;flex-direction:column;gap:10px;width:100%;max-width:340px}
.info-row{display:flex;justify-content:space-between;padding:10px 16px;background:rgba(255,255,255,.03);border:1px solid var(--border);border-radius:10px;font-size:13px}
.info-k{color:var(--text-faint)}
.info-v{color:var(--text);font-weight:600}
.info-v.ok{color:var(--good)}
.scan-actions{display:flex;gap:12px;flex-wrap:wrap;justify-content:center}
.mock-btn{padding:10px 22px;border:1px solid var(--border);border-radius:24px;font-size:13px;color:var(--text-dim);transition:all .2s}
.mock-btn:hover{border-color:var(--border-strong);color:var(--text)}
.mock-btn.active{background:linear-gradient(135deg,var(--accent),var(--accent2));border-color:transparent;color:#fff;font-weight:600}
.preview-note{margin-top:16px;text-align:center;font-size:12px;color:var(--text-faint);font-style:italic}

/* 全盘扫描 - 进度 */
.scan-progress{width:100%;max-width:480px}
.prog-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.prog-title{font-size:14px;font-weight:600;color:var(--text)}
.prog-pct{font-size:20px;font-weight:900;color:var(--accent3)}
.prog-bar{height:10px;background:rgba(255,255,255,.05);border-radius:6px;overflow:hidden;border:1px solid var(--border)}
.prog-fill{height:100%;width:42%;background:linear-gradient(90deg,var(--accent),var(--accent3));border-radius:6px;animation:progPulse 2.5s ease infinite;position:relative}
.prog-fill::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent,rgba(255,255,255,.4),transparent);animation:progShine 1.8s linear infinite}
@keyframes progPulse{0%,100%{filter:brightness(1)}50%{filter:brightness(1.2)}}
@keyframes progShine{from{transform:translateX(-100%)}to{transform:translateX(100%)}}
.prog-meta{display:flex;justify-content:space-between;margin-top:12px;font-size:13px;color:var(--text-dim)}
.prog-meta b{color:var(--text)}
.prog-meta b.warn{color:var(--warn)}
.scan-list{width:100%;max-width:480px;background:rgba(0,0,0,.2);border:1px solid var(--border);border-radius:12px;overflow:hidden}
.list-head{padding:10px 16px;font-size:12px;font-weight:600;color:var(--text-faint);border-bottom:1px solid var(--border);letter-spacing:1px}
.list-item{display:flex;align-items:center;gap:10px;padding:11px 16px;font-size:13px;border-bottom:1px solid rgba(120,130,220,.08)}
.list-item:last-child{border-bottom:none}
.file-ico{font-size:15px}
.file-name{flex:1;color:var(--text-dim);font-family:monospace;font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.file-tag{font-size:11px;padding:3px 10px;border-radius:10px;font-weight:600}
.file-tag.scan{background:rgba(0,212,255,.15);color:var(--accent3)}
.file-tag.warn{background:rgba(255,176,32,.15);color:var(--warn)}
.file-tag.ok{background:rgba(0,224,160,.15);color:var(--good)}

/* 自定义扫描 - 勾选 */
.custom-pick{width:100%;max-width:420px;display:flex;flex-direction:column;align-items:center;gap:20px}
.pick-title{font-size:15px;font-weight:600;color:var(--text);align-self:flex-start}
.pick-list{width:100%;display:flex;flex-direction:column;gap:10px}
.pick-item{display:flex;align-items:center;gap:14px;padding:14px 18px;background:rgba(255,255,255,.03);border:1px solid var(--border);border-radius:12px;cursor:pointer;transition:all .2s}
.pick-item:hover{border-color:var(--border-strong);background:rgba(108,92,255,.06)}
.pick-item input{position:absolute;opacity:0;width:0;height:0}
.pick-box{width:20px;height:20px;border:2px solid var(--text-faint);border-radius:6px;display:flex;align-items:center;justify-content:center;transition:all .2s;flex-shrink:0}
.pick-item input:checked ~ .pick-box{background:linear-gradient(135deg,var(--accent),var(--accent2));border-color:transparent}
.pick-item input:checked ~ .pick-box::after{content:"✓";color:#fff;font-size:13px;font-weight:700}
.pick-ico{font-size:18px}
.pick-text{font-size:14px;color:var(--text)}
.pick-start{margin-top:6px;padding:12px 36px}

/* ===== FAQ ===== */
.faq{position:relative;z-index:2;max-width:760px;margin:0 auto;padding:60px 24px 100px}
.faq-list{display:flex;flex-direction:column;gap:14px}
.faq-item{background:var(--panel);border:1px solid var(--border);border-radius:14px;backdrop-filter:blur(12px);overflow:hidden;transition:border-color .25s}
.faq-item[open]{border-color:var(--border-strong)}
.faq-item summary{list-style:none;padding:20px 24px;font-size:15px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item p{padding:0 24px 20px;font-size:14px;color:var(--text-dim)}
.faq-icon{font-size:22px;color:var(--accent3);transition:transform .25s;flex-shrink:0}
.faq-item[open] .faq-icon{transform:rotate(45deg)}

/* ===== CTA ===== */
.cta-section{position:relative;z-index:2;padding:60px 24px 120px}
.cta-box{max-width:680px;margin:auto;text-align:center;padding:56px 32px;background:var(--panel);backdrop-filter:blur(16px);border:1px solid var(--border-strong);border-radius:24px;box-shadow:var(--shadow);position:relative;overflow:hidden}
.cta-box::before{content:"";position:absolute;top:-50%;left:50%;width:400px;height:400px;background:radial-gradient(circle,rgba(108,92,255,.2),transparent 70%);transform:translateX(-50%)}
.cta-box h2{font-size:clamp(26px,4vw,38px);font-weight:900;margin-bottom:12px;position:relative}
.cta-box p{color:var(--text-dim);margin-bottom:28px;position:relative}
.cta-box .btn-primary{position:relative}

/* ===== 页脚 ===== */
.footer{position:relative;z-index:2;border-top:1px solid var(--border);padding:32px 24px;text-align:center}
.footer-inner{max-width:var(--maxw);margin:auto;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}
.footer-brand{font-weight:900;font-size:16px}
.footer-brand .brand-mark{color:var(--accent3)}
.footer-copy{font-size:13px;color:var(--text-faint)}

/* ===== 弹窗 ===== */
.modal-mask{position:fixed;inset:0;z-index:100;background:rgba(4,6,18,.75);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;padding:24px;opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s}
.modal-mask.show{opacity:1;visibility:visible}
.modal{position:relative;width:100%;max-width:440px;background:var(--panel-solid);border:1px solid var(--border-strong);border-radius:20px;padding:36px 32px;box-shadow:var(--shadow);transform:translateY(20px) scale(.97);transition:transform .35s var(--ease);max-height:90vh;overflow-y:auto}
.modal-mask.show .modal{transform:translateY(0) scale(1)}
.modal-close{position:absolute;top:16px;right:18px;width:34px;height:34px;border-radius:50%;font-size:24px;color:var(--text-faint);display:flex;align-items:center;justify-content:center;transition:all .2s;line-height:1}
.modal-close:hover{background:rgba(255,255,255,.08);color:var(--text)}
.modal-head{text-align:center;margin-bottom:26px}
.modal-tag{display:inline-block;font-size:12px;font-weight:600;color:var(--accent3);letter-spacing:1px;margin-bottom:8px}
.modal-head h3{font-size:22px;font-weight:800;margin-bottom:6px}
.modal-head p{font-size:14px;color:var(--text-dim)}

/* 表单字段 */
.field{margin-bottom:20px}
.field label{display:block;font-size:13px;font-weight:600;color:var(--text-dim);margin-bottom:8px}
.field input[type=email]{width:100%;padding:13px 16px;background:rgba(255,255,255,.04);border:1px solid var(--border);border-radius:11px;font-size:15px;color:var(--text);transition:border-color .2s,background .2s}
.field input[type=email]:focus{outline:none;border-color:var(--accent);background:rgba(108,92,255,.06)}
.field input::placeholder{color:var(--text-faint)}
.field-err{display:block;font-size:12px;color:var(--warn);margin-top:6px;min-height:16px}
.modal-note{font-size:12px;color:var(--text-faint);text-align:center;margin-top:16px;line-height:1.6}

/* 人机验证滑块 */
.captcha{position:relative;height:48px;background:rgba(255,255,255,.04);border:1px solid var(--border);border-radius:11px;overflow:hidden;user-select:none}
.captcha-track{position:absolute;inset:0;display:flex;align-items:center;justify-content:center}
.captcha-progress{position:absolute;left:0;top:0;bottom:0;width:0;background:linear-gradient(90deg,rgba(0,224,160,.25),rgba(0,224,160,.15));transition:width .1s linear}
.captcha-hint{font-size:13px;color:var(--text-faint);position:relative;z-index:1}
.captcha.done .captcha-hint{color:var(--good)}
.captcha.done .captcha-progress{width:calc(100% - 48px)!important;background:rgba(0,224,160,.2)}
.captcha-slider{position:absolute;left:3px;top:3px;width:42px;height:42px;border-radius:9px;background:linear-gradient(135deg,var(--accent),var(--accent2));display:flex;align-items:center;justify-content:center;font-size:18px;color:#fff;cursor:grab;transition:background .2s;z-index:2;box-shadow:0 4px 12px rgba(108,92,255,.4)}
.captcha-slider:active{cursor:grabbing}
.captcha.done .captcha-slider{background:linear-gradient(135deg,var(--good),#00a0ff)}

/* 验证码输入 */
.code-input{display:flex;gap:8px;justify-content:center}
.code-input input{width:42px;height:52px;text-align:center;font-size:22px;font-weight:700;color:var(--text);background:rgba(255,255,255,.04);border:1px solid var(--border);border-radius:11px;transition:border-color .2s,background .2s}
.code-input input:focus{outline:none;border-color:var(--accent);background:rgba(108,92,255,.08)}
.code-input input.filled{border-color:var(--accent3);color:var(--accent3)}
.code-dash{display:flex;align-items:center;color:var(--text-faint);font-size:20px}
.modal-foot-row{display:flex;justify-content:space-between;align-items:center;margin-top:18px}
.link-btn{font-size:13px;color:var(--text-dim);transition:color .2s}
.link-btn:hover:not(:disabled){color:var(--text)}
.link-btn:disabled{opacity:.5;cursor:not-allowed}

/* 成功页 */
.success-view{text-align:center;padding:12px 0}
.success-check{width:80px;height:80px;margin:0 auto 24px;border-radius:50%;background:linear-gradient(135deg,var(--good),#00a0ff);display:flex;align-items:center;justify-content:center;font-size:42px;color:#fff;box-shadow:0 0 40px rgba(0,224,160,.5);animation:pop .5s var(--ease)}
@keyframes pop{0%{transform:scale(0)}60%{transform:scale(1.15)}100%{transform:scale(1)}}
.success-view h3{font-size:24px;font-weight:800;margin-bottom:10px}
.success-view p{font-size:14px;color:var(--text-dim);line-height:1.8;margin-bottom:28px}

/* Toast */
.toast{position:fixed;top:80px;left:50%;transform:translateX(-50%) translateY(-20px);z-index:200;padding:14px 26px;border-radius:12px;font-size:14px;font-weight:600;color:#fff;backdrop-filter:blur(12px);opacity:0;visibility:hidden;transition:all .35s var(--ease);max-width:90vw;text-align:center}
.toast.show{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.toast.ok{background:rgba(0,224,160,.92);box-shadow:0 8px 30px rgba(0,224,160,.3)}
.toast.err{background:rgba(255,80,80,.92);box-shadow:0 8px 30px rgba(255,80,80,.3)}

/* ===== 响应式 ===== */
@media(max-width:900px){
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .nav-links{display:none}
}
/* 窗口高度不足或窄屏时隐藏滚动提示，避免与 stats 重叠 */
@media(max-height:760px), (max-width:640px){
  .scroll-hint{display:none}
  .hero{padding-bottom:80px}
}
@media(max-width:640px){
  .feature-grid{grid-template-columns:1fr}
  .hero-cta{flex-direction:column;gap:14px}
  .hero-cta .btn-text{order:2}
  .stat{padding:0 18px}
  .stat-sep{height:30px}
  .code-input input{width:36px;height:46px;font-size:18px}
  .code-input{gap:5px}
  .modal{padding:28px 22px}
  .footer-inner{flex-direction:column}
  .cta-box{padding:40px 24px}
}
@media(prefers-reduced-motion:reduce){
  *{animation-duration:.01ms!important;transition-duration:.01ms!important}
}