*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --ink:#060d18;
  --deep:#0c1829;
  --panel:#132238;
  --line:rgba(255,255,255,.09);
  --line-strong:rgba(255,255,255,.18);
  --blue:#3b7ddd;
  --blue-bright:#5b9aff;
  --teal:#2dd4bf;
  --cream:#f3f0e8;
  --cream-ink:#1c1917;
  --muted:#8fa3be;
  --mono:"IBM Plex Mono",Consolas,monospace;
  --display:"Fraunces","Noto Serif SC",Georgia,serif;
  --body:"IBM Plex Sans","Noto Sans SC",system-ui,sans-serif;
  --side:240px;
  --ease:cubic-bezier(.22,1,.36,1)
}
html{scroll-behavior:smooth}
body{
  font-family:var(--body);background:var(--ink);color:#e8eef6;
  line-height:1.65;min-height:100vh;overflow-x:hidden
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}

/* ===== 侧栏导航（非药丸） ===== */
.shell{display:flex;min-height:100vh}
.sidebar{
  width:var(--side);flex-shrink:0;position:fixed;inset:0 auto 0 0;z-index:200;
  background:var(--deep);border-right:1px solid var(--line);
  display:flex;flex-direction:column;padding:28px 0
}
.brand{
  display:flex;align-items:center;gap:12px;padding:0 24px 32px;
  border-bottom:1px solid var(--line);margin-bottom:24px
}
.brand img{width:36px;height:36px}
.brand span{font-family:var(--display);font-size:1.15rem;font-weight:600;letter-spacing:-.02em}
.side-nav{display:flex;flex-direction:column;gap:2px;padding:0 12px;flex:1}
.side-nav a{
  padding:12px 16px;font-size:.88rem;font-weight:500;color:var(--muted);
  border-left:2px solid transparent;transition:.25s var(--ease)
}
.side-nav a:hover{color:#fff;background:rgba(255,255,255,.04)}
.side-nav a.on{color:var(--blue-bright);border-left-color:var(--blue-bright);background:rgba(59,125,221,.08)}
.side-foot{padding:20px 24px;border-top:1px solid var(--line);font-size:.72rem;color:var(--muted);line-height:1.5}
.side-foot code{font-family:var(--mono);color:var(--teal);font-size:.68rem}

.content{flex:1;margin-left:var(--side);min-width:0}

/* 移动端底栏 */
.mob-bar{
  display:none;position:fixed;bottom:0;left:0;right:0;z-index:200;
  background:var(--deep);border-top:1px solid var(--line);
  padding:8px 0 calc(8px + env(safe-area-inset-bottom))
}
.mob-bar nav{display:flex;justify-content:space-around}
.mob-bar a{
  display:flex;flex-direction:column;align-items:center;gap:3px;
  font-size:.65rem;color:var(--muted);padding:6px 16px
}
.mob-bar a.on{color:var(--blue-bright)}
.mob-bar a svg{width:20px;height:20px}

/* ===== Hero：全屏斜切 ===== */
.hero-full{
  min-height:92vh;display:grid;grid-template-columns:1fr 1fr;
  position:relative;overflow:hidden
}
.hero-full::before{
  content:'';position:absolute;inset:0;
  background:
    linear-gradient(135deg,transparent 48%,rgba(59,125,221,.06) 48%,rgba(59,125,221,.06) 52%,transparent 52%),
    repeating-linear-gradient(0deg,transparent,transparent 79px,var(--line) 79px,var(--line) 80px),
    repeating-linear-gradient(90deg,transparent,transparent 79px,var(--line) 79px,var(--line) 80px);
  opacity:.35;pointer-events:none
}
.hero-copy{
  display:flex;flex-direction:column;justify-content:center;
  padding:80px 48px 80px 56px;position:relative;z-index:1
}
.hero-eyebrow{
  font-family:var(--mono);font-size:.72rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--teal);margin-bottom:20px
}
.hero-copy h1{
  font-family:var(--display);font-size:clamp(2.4rem,4.5vw,3.6rem);
  font-weight:500;line-height:1.08;letter-spacing:-.03em;margin-bottom:24px
}
.hero-copy h1 em{font-style:italic;color:var(--blue-bright)}
.hero-lead{font-size:1.05rem;color:var(--muted);max-width:420px;margin-bottom:36px;line-height:1.75}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:14px 26px;
  font-size:.88rem;font-weight:600;border-radius:4px;transition:.3s var(--ease);cursor:pointer;border:none
}
.btn-fill{background:var(--blue);color:#fff}
.btn-fill:hover{background:var(--blue-bright);transform:translateY(-2px)}
.btn-line{background:transparent;color:#fff;border:1px solid var(--line-strong)}
.btn-line:hover{border-color:var(--blue-bright);color:var(--blue-bright)}

.hero-stage{
  display:flex;align-items:center;justify-content:center;
  padding:60px 48px 60px 24px;position:relative;z-index:1
}
.shield-wrap{position:relative;width:min(420px,90%)}
.shield-svg{width:100%;animation:shield-float 6s ease-in-out infinite}
@keyframes shield-float{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}
.shield-ring{
  position:absolute;inset:-20%;border:1px solid var(--line);
  border-radius:50%;animation:ring-spin 20s linear infinite
}
.shield-ring:nth-child(2){inset:-35%;animation-direction:reverse;animation-duration:30s;opacity:.5}
@keyframes ring-spin{to{transform:rotate(360deg)}}
.hero-shot{
  position:absolute;bottom:8%;right:5%;width:55%;
  border-radius:6px;border:1px solid var(--line-strong);
  box-shadow:0 32px 80px rgba(0,0,0,.55);
  transform:rotate(2deg);transition:transform .5s var(--ease);cursor:zoom-in
}
.hero-shot:hover{transform:rotate(0deg) scale(1.02)}

/* ===== 奶油色跑马灯带 ===== */
.marquee-band{background:var(--cream);color:var(--cream-ink);padding:18px 0;overflow:hidden;border-block:1px solid #d6d0c4}
.marquee-track{display:flex;gap:48px;animation:marquee 28s linear infinite;width:max-content}
.marquee-track span{
  font-family:var(--mono);font-size:.78rem;font-weight:500;
  letter-spacing:.06em;text-transform:uppercase;white-space:nowrap;opacity:.7
}
@keyframes marquee{to{transform:translateX(-50%)}}

/* ===== 交错图文（zigzag） ===== */
.zigzag{padding:100px 0}
.zigzag-item{
  display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;
  max-width:1100px;margin:0 auto 100px;padding:0 48px
}
.zigzag-item.flip{direction:rtl}
.zigzag-item.flip > *{direction:ltr}
.zigzag-num{font-family:var(--mono);font-size:.7rem;color:var(--teal);letter-spacing:.1em;margin-bottom:12px}
.zigzag-text h2{
  font-family:var(--display);font-size:clamp(1.6rem,3vw,2.2rem);
  font-weight:500;line-height:1.2;margin-bottom:16px;letter-spacing:-.02em
}
.zigzag-text p{color:var(--muted);font-size:.95rem;line-height:1.8;margin-bottom:20px}
.zigzag-tags{display:flex;flex-wrap:wrap;gap:8px}
.zigzag-tags span{
  font-family:var(--mono);font-size:.68rem;padding:5px 10px;
  border:1px solid var(--line);color:var(--muted);border-radius:2px
}
.zigzag-visual{position:relative}
.zigzag-visual img{
  border-radius:4px;border:1px solid var(--line-strong);
  box-shadow:0 20px 50px rgba(0,0,0,.4);cursor:zoom-in;transition:transform .4s var(--ease)
}
.zigzag-visual img:hover{transform:scale(1.02)}
.zigzag-visual::after{
  content:'';position:absolute;top:-12px;left:-12px;right:12px;bottom:12px;
  border:1px solid var(--blue);opacity:.25;border-radius:4px;pointer-events:none
}

/* ===== 加密演示面板 ===== */
.crypto-panel{
  background:var(--panel);border-block:1px solid var(--line);
  padding:80px 48px
}
.crypto-inner{max-width:900px;margin:0 auto}
.crypto-inner h2{
  font-family:var(--display);font-size:1.8rem;font-weight:500;
  margin-bottom:8px;text-align:center
}
.crypto-inner .sub{text-align:center;color:var(--muted);font-size:.9rem;margin-bottom:36px}
.terminal{
  background:#040a12;border:1px solid var(--line-strong);border-radius:4px;overflow:hidden
}
.terminal-bar{
  display:flex;align-items:center;gap:8px;padding:10px 16px;
  background:rgba(255,255,255,.03);border-bottom:1px solid var(--line)
}
.terminal-bar i{width:10px;height:10px;border-radius:50%;display:block}
.terminal-bar i:nth-child(1){background:#ff5f57}
.terminal-bar i:nth-child(2){background:#febc2e}
.terminal-bar i:nth-child(3){background:#28c840}
.terminal-bar span{margin-left:8px;font-family:var(--mono);font-size:.72rem;color:var(--muted)}
.terminal-body{padding:24px;font-family:var(--mono);font-size:.82rem;line-height:1.9;min-height:200px}
.terminal-body .prompt{color:var(--teal)}
.terminal-body .cmd{color:var(--blue-bright)}
.terminal-body .out{color:var(--muted)}
.terminal-body .ok{color:#4ade80}
.terminal-body .blink{animation:blink .9s step-end infinite}
@keyframes blink{50%{opacity:0}}
.crypto-controls{display:flex;gap:12px;margin-top:20px;flex-wrap:wrap}
.pwd-field{
  flex:1;min-width:200px;padding:12px 16px;background:var(--deep);
  border:1px solid var(--line-strong);border-radius:4px;
  color:#fff;font-family:var(--mono);font-size:.85rem;outline:none
}
.pwd-field:focus{border-color:var(--blue)}

/* ===== 横向胶片截图 ===== */
.filmstrip{padding:80px 0 100px;overflow:hidden}
.filmstrip-head{max-width:1100px;margin:0 auto 36px;padding:0 48px}
.filmstrip-head h2{font-family:var(--display);font-size:1.8rem;font-weight:500;margin-bottom:6px}
.filmstrip-head p{color:var(--muted);font-size:.9rem}
.film-scroll{
  display:flex;gap:20px;padding:0 48px 20px;
  overflow-x:auto;scroll-snap-type:x mandatory;
  scrollbar-width:thin;scrollbar-color:var(--blue) transparent
}
.film-scroll::-webkit-scrollbar{height:4px}
.film-scroll::-webkit-scrollbar-thumb{background:var(--blue);border-radius:2px}
.film-card{
  flex:0 0 min(480px,78vw);scroll-snap-align:start;
  position:relative;border-radius:4px;overflow:hidden;
  border:1px solid var(--line-strong);cursor:zoom-in;
  transition:transform .35s var(--ease)
}
.film-card:hover{transform:translateY(-6px)}
.film-card img{width:100%;aspect-ratio:16/10;object-fit:cover}
.film-cap{
  position:absolute;bottom:0;left:0;right:0;padding:20px 18px;
  background:linear-gradient(transparent,rgba(6,13,24,.92));
  font-size:.85rem
}
.film-cap strong{display:block;font-weight:600;margin-bottom:2px}
.film-cap span{font-size:.75rem;color:var(--muted)}

/* ===== 功能页：手风琴 + 大图 ===== */
.page-hero{
  padding:72px 48px 56px;border-bottom:1px solid var(--line);
  background:linear-gradient(180deg,var(--panel) 0%,var(--ink) 100%)
}
.page-hero h1{font-family:var(--display);font-size:clamp(2rem,4vw,2.8rem);font-weight:500;margin-bottom:12px}
.page-hero p{color:var(--muted);max-width:520px;font-size:.95rem}

.accordion{max-width:760px;margin:60px auto;padding:0 48px}
.acc-item{border-bottom:1px solid var(--line)}
.acc-trigger{
  width:100%;display:flex;align-items:center;justify-content:space-between;
  padding:22px 0;background:none;border:none;color:#fff;
  font-family:var(--body);font-size:1rem;font-weight:600;text-align:left;cursor:pointer
}
.acc-trigger .idx{font-family:var(--mono);font-size:.72rem;color:var(--teal);margin-right:14px}
.acc-trigger .arrow{transition:transform .3s var(--ease);color:var(--muted)}
.acc-item.open .acc-trigger .arrow{transform:rotate(180deg);color:var(--blue-bright)}
.acc-body{max-height:0;overflow:hidden;transition:max-height .45s var(--ease)}
.acc-item.open .acc-body{max-height:300px}
.acc-body p{padding:0 0 22px;color:var(--muted);font-size:.9rem;line-height:1.75}

.feature-showcase{
  display:grid;grid-template-columns:1.2fr 1fr;gap:0;
  margin:60px 48px 80px;border:1px solid var(--line);border-radius:4px;overflow:hidden
}
.feature-showcase img{width:100%;height:100%;object-fit:cover;cursor:zoom-in;min-height:360px}
.feature-showcase .fs-text{
  padding:48px 40px;background:var(--panel);
  display:flex;flex-direction:column;justify-content:center
}
.feature-showcase .fs-text h3{font-family:var(--display);font-size:1.5rem;margin-bottom:12px}
.feature-showcase .fs-text p{color:var(--muted);font-size:.9rem;line-height:1.75}

/* ===== 下载页：平台矩阵 ===== */
.dl-matrix{
  display:grid;grid-template-columns:repeat(4,1fr);
  gap:1px;background:var(--line);margin:48px;border:1px solid var(--line);border-radius:4px;overflow:hidden
}
.dl-cell{
  background:var(--deep);padding:32px 24px;text-align:center;
  transition:background .3s
}
.dl-cell:hover{background:var(--panel)}
.dl-cell .plat-icon{
  width:48px;height:48px;margin:0 auto 16px;border-radius:4px;
  background:rgba(59,125,221,.12);display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-size:.75rem;font-weight:700;color:var(--blue-bright)
}
.dl-cell b{display:block;font-size:.95rem;margin-bottom:6px}
.dl-cell span{display:block;font-size:.75rem;color:var(--muted);margin-bottom:18px;line-height:1.5}
.dl-cell .btn{width:100%;justify-content:center;padding:10px;font-size:.78rem}

.dl-banner{
  margin:0 48px 48px;border-radius:4px;overflow:hidden;
  border:1px solid var(--line-strong);cursor:zoom-in
}
.dl-banner img{width:100%}

.dl-steps{
  display:grid;grid-template-columns:repeat(3,1fr);gap:24px;
  padding:0 48px 80px;max-width:1100px;margin:0 auto
}
.dl-step{padding-top:20px;border-top:2px solid var(--blue)}
.dl-step .step-n{font-family:var(--mono);font-size:.7rem;color:var(--teal);margin-bottom:10px}
.dl-step h4{font-size:.95rem;font-weight:600;margin-bottom:8px}
.dl-step p{font-size:.82rem;color:var(--muted);line-height:1.65}

/* ===== 页脚 ===== */
.site-foot{
  padding:40px 48px;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;
  font-size:.78rem;color:var(--muted)
}
.site-foot a{color:var(--blue-bright)}

/* ===== 灯箱（极简风格） ===== */
.viewer{
  position:fixed;inset:0;z-index:9999;background:rgba(4,8,16,.94);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  opacity:0;visibility:hidden;transition:.35s
}
.viewer.open{opacity:1;visibility:visible}
.viewer img{
  max-width:min(92vw,1100px);max-height:78vh;border-radius:2px;
  box-shadow:0 0 0 1px var(--line-strong)
}
.viewer-cap{margin-top:16px;font-family:var(--mono);font-size:.78rem;color:var(--muted)}
.viewer-x{
  position:absolute;top:24px;right:28px;background:none;border:1px solid var(--line-strong);
  color:#fff;width:40px;height:40px;border-radius:2px;cursor:pointer;font-size:18px
}
.viewer-x:hover{border-color:var(--blue-bright)}
.viewer-arr{
  position:absolute;top:50%;transform:translateY(-50%);
  background:none;border:1px solid var(--line-strong);color:#fff;
  width:44px;height:44px;border-radius:2px;cursor:pointer;font-size:20px
}
.viewer-arr:hover{border-color:var(--blue-bright)}
.viewer-prev{left:24px}
.viewer-next{right:24px}
.viewer-thumbs{
  display:flex;gap:8px;margin-top:20px;max-width:90vw;overflow-x:auto;padding-bottom:8px
}
.viewer-thumbs button{
  flex-shrink:0;width:72px;height:48px;border:2px solid transparent;
  border-radius:2px;overflow:hidden;cursor:pointer;padding:0;background:none;opacity:.5;transition:.2s
}
.viewer-thumbs button.active,.viewer-thumbs button:hover{opacity:1;border-color:var(--blue-bright)}
.viewer-thumbs img{width:100%;height:100%;object-fit:cover}

/* ===== 滚动入场（不同于 reveal 上浮） ===== */
.fade-slide{opacity:0;transform:translateX(-24px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.fade-slide.from-right{transform:translateX(24px)}
.fade-slide.in{opacity:1;transform:none}

/* ===== 响应式 ===== */
@media(max-width:960px){
  :root{--side:0}
  .sidebar{display:none}
  .mob-bar{display:block}
  .content{margin-left:0;padding-bottom:72px}
  .hero-full{grid-template-columns:1fr;min-height:auto}
  .hero-copy{padding:100px 28px 40px}
  .hero-stage{padding:20px 28px 60px}
  .hero-shot{position:relative;width:100%;right:auto;bottom:auto;transform:none;margin-top:24px}
  .zigzag-item,.zigzag-item.flip{grid-template-columns:1fr;gap:32px;padding:0 28px;direction:ltr}
  .feature-showcase{grid-template-columns:1fr;margin:40px 28px}
  .dl-matrix{grid-template-columns:repeat(2,1fr);margin:28px}
  .dl-steps{grid-template-columns:1fr;padding:0 28px}
  .film-scroll,.filmstrip-head,.page-hero,.crypto-panel,.site-foot{padding-left:28px;padding-right:28px}
  .accordion{padding:0 28px}
  .seo-band,.prose-block,.faq-section,.compare-section{padding-left:28px;padding-right:28px}
  .faq-grid{grid-template-columns:1fr}
  .compare-table{font-size:.78rem}
  .guide-steps{padding:0 28px}
  .mob-bar a{font-size:.58rem;padding:6px 10px}
}

/* ===== SEO 长文内容区 ===== */
.seo-band{
  padding:80px 48px;border-block:1px solid var(--line)
}
.seo-band.cream{background:var(--cream);color:var(--cream-ink);border-color:#d6d0c4}
.seo-band.cream .prose-lead,.seo-band.cream .prose-block p{color:#57534e}
.seo-band.cream .prose-block h2,.seo-band.cream .prose-block h3{color:var(--cream-ink)}
.seo-band.cream .prose-block a{color:#1d4ed8}
.seo-band.cream .mini-tile{background:#fff;border-color:#d6d0c4}
.seo-band.cream .mini-tile p{color:#57534e}
.seo-inner{max-width:900px;margin:0 auto}
.seo-inner.wide{max-width:1100px}
.seo-eyebrow{font-family:var(--mono);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--teal);margin-bottom:12px}
.seo-band.cream .seo-eyebrow{color:#0d9488}
.seo-inner h2{font-family:var(--display);font-size:clamp(1.5rem,3vw,2rem);font-weight:500;margin-bottom:14px;line-height:1.2}
.prose-lead{font-size:.95rem;color:var(--muted);margin-bottom:28px;line-height:1.75}
.prose-block{margin-bottom:36px}
.prose-block h3{font-size:1.05rem;font-weight:600;margin:24px 0 10px}
.prose-block p{font-size:.9rem;color:var(--muted);line-height:1.8;margin-bottom:14px}
.prose-block ul,.prose-block ol{margin:0 0 16px 20px;font-size:.9rem;color:var(--muted);line-height:1.75}
.prose-block li{margin-bottom:6px}
.prose-block a{color:var(--blue-bright)}
.prose-block code{font-family:var(--mono);font-size:.82rem;background:rgba(59,125,221,.12);padding:2px 6px;border-radius:2px}
.prose-block img{width:100%;border-radius:4px;border:1px solid var(--line-strong);margin:16px 0;cursor:zoom-in}

.mini-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:20px}
.mini-tile{
  padding:20px;background:var(--panel);border:1px solid var(--line);border-radius:4px
}
.mini-tile h4{font-size:.88rem;font-weight:600;margin-bottom:8px}
.mini-tile p{font-size:.82rem;color:var(--muted);line-height:1.65;margin:0}

/* FAQ */
.faq-section{padding:80px 48px}
.faq-section h2{font-family:var(--display);font-size:1.8rem;font-weight:500;margin-bottom:8px;text-align:center}
.faq-section .sub{text-align:center;color:var(--muted);font-size:.9rem;margin-bottom:36px}
.faq-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;max-width:1000px;margin:0 auto}
.faq-item{
  padding:24px;background:var(--panel);border:1px solid var(--line);
  border-radius:4px;border-left:3px solid var(--blue)
}
.faq-item h4{font-size:.92rem;font-weight:600;margin-bottom:10px}
.faq-item p{font-size:.84rem;color:var(--muted);line-height:1.7;margin:0}

/* 对比表 */
.compare-section{padding:0 48px 80px}
.compare-section h2{font-family:var(--display);font-size:1.6rem;font-weight:500;margin-bottom:24px;text-align:center}
.compare-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:4px}
.compare-table{width:100%;border-collapse:collapse;font-size:.85rem}
.compare-table th,.compare-table td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--line)}
.compare-table th{background:var(--panel);font-weight:600;font-size:.8rem}
.compare-table td{color:var(--muted)}
.compare-table tr:last-child td{border-bottom:none}
.compare-table .yes{color:var(--teal);font-weight:600}
.compare-table .highlight{background:rgba(59,125,221,.08)}

/* 指南步骤 */
.guide-steps{max-width:820px;margin:0 auto;padding:0 48px 60px}
.guide-step{
  display:grid;grid-template-columns:56px 1fr;gap:20px;
  padding:28px 0;border-bottom:1px solid var(--line)
}
.guide-step:last-child{border-bottom:none}
.guide-step .num{
  width:48px;height:48px;display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-size:.85rem;font-weight:600;color:var(--blue-bright);
  border:1px solid var(--line-strong);border-radius:4px
}
.guide-step h3{font-size:1rem;font-weight:600;margin-bottom:8px}
.guide-step p{font-size:.88rem;color:var(--muted);line-height:1.75;margin-bottom:10px}
.guide-step ul{margin:0 0 0 18px;font-size:.85rem;color:var(--muted);line-height:1.7}
.guide-step li{margin-bottom:4px}

/* 面包屑（SEO 可见） */
.breadcrumb{
  padding:16px 48px;font-family:var(--mono);font-size:.72rem;color:var(--muted);
  border-bottom:1px solid var(--line)
}
.breadcrumb a{color:var(--blue-bright)}
.breadcrumb span{margin:0 8px;opacity:.4}

/* 页脚扩展 */
.site-foot .foot-links{display:flex;gap:20px;flex-wrap:wrap}
.site-foot .foot-links a{color:var(--muted)}
.site-foot .foot-links a:hover{color:var(--blue-bright)}
.friend-links{width:100%;margin-top:14px;font-size:.78rem;color:var(--muted)}
.friend-links a{color:var(--blue-bright);text-decoration:none}
.friend-links a:hover{text-decoration:underline}