/* ============ Web3Lab clone — design tokens ============ */
:root{
  --bg:#000;
  --surface:#111;
  --surface2:#161616;
  --border:#222;
  --border-strong:#333;
  --text:#fff;
  --text-dim:#a1a1a6;
  --text-mute:#6e6e73;
  --accent:#fff;
  --accent-dim:rgba(255,255,255,.08);
  --font:-apple-system,BlinkMacSystemFont,'SF Pro Display','SF Pro Text','Segoe UI','PingFang SC','Hiragino Sans','Yu Gothic','Malgun Gothic','Microsoft YaHei','Microsoft JhengHei',Roboto,'Helvetica Neue',Arial,sans-serif;
  --font-mono:'SF Mono',SFMono-Regular,ui-monospace,'Roboto Mono',Menlo,monospace;
  --maxw:1080px;
  --gutter:clamp(20px,5vw,48px);
  --r:16px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--font);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
::selection{background:rgba(255,255,255,.2)}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter)}
.wrap-narrow{max-width:760px}
.center{text-align:center}

/* ============ Splash ============ */
#splash{
  position:fixed;inset:0;z-index:200;
  background:var(--bg);
  display:flex;align-items:center;justify-content:center;
  transition:opacity .5s ease,visibility .5s;
}
#splash.hide{opacity:0;visibility:hidden}
.splash-inner{display:flex;flex-direction:column;align-items:center;gap:14px}
.logo-glyph{font-size:28px;line-height:1;filter:grayscale(1) brightness(1.8)}
.splash-name{font-size:20px;font-weight:700;letter-spacing:.02em}
.splash-bar{width:120px;height:2px;background:var(--border);border-radius:2px;overflow:hidden}
.splash-bar i{display:block;height:100%;width:40%;background:#fff;border-radius:2px;animation:load 1s ease-in-out infinite}
@keyframes load{0%{transform:translateX(-120%)}100%{transform:translateX(320%)}}

/* ============ Header ============ */
#top{
  position:fixed;top:0;left:0;right:0;z-index:100;
  border-bottom:1px solid transparent;
  transition:background .3s,border-color .3s,backdrop-filter .3s;
}
#top.scrolled{
  background:rgba(0,0,0,.72);
  backdrop-filter:saturate(180%) blur(18px);
  -webkit-backdrop-filter:saturate(180%) blur(18px);
  border-color:var(--border);
}
.nav-row{display:flex;align-items:center;justify-content:space-between;height:60px;gap:16px}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;font-size:17px;letter-spacing:.01em}
.nav-links{display:flex;gap:26px}
.nav-links a{color:var(--text-dim);font-size:14px;transition:color .2s}
.nav-links a:hover{color:#fff}
.nav-right{display:flex;align-items:center;gap:12px}

/* language switch */
.lang-switch{position:relative}
.lang-btn{
  display:flex;align-items:center;gap:6px;
  background:none;border:1px solid var(--border);color:var(--text-dim);
  border-radius:999px;padding:6px 12px;font-size:12.5px;font-family:var(--font-mono);
  cursor:pointer;transition:border-color .2s,color .2s;
}
.lang-btn:hover{border-color:var(--border-strong);color:#fff}
.lang-btn .caret{transition:transform .2s}
.lang-switch.open .lang-btn .caret{transform:rotate(180deg)}
.lang-menu{
  position:absolute;top:calc(100% + 8px);right:0;min-width:172px;
  background:var(--surface);border:1px solid var(--border-strong);border-radius:12px;
  padding:6px;box-shadow:0 16px 48px rgba(0,0,0,.6);
  opacity:0;visibility:hidden;transform:translateY(-6px);
  transition:opacity .18s,transform .18s,visibility .18s;
}
.lang-switch.open .lang-menu{opacity:1;visibility:visible;transform:translateY(0)}
.lang-menu li{
  display:flex;justify-content:space-between;align-items:center;
  padding:8px 10px;border-radius:8px;font-size:13.5px;color:var(--text-dim);cursor:pointer;
}
.lang-menu li:hover{background:var(--accent-dim);color:#fff}
.lang-menu li i{font-style:normal;font-family:var(--font-mono);font-size:11px;color:var(--text-mute)}
.lang-menu li.active{color:#fff}
.lang-menu li.active i{color:#fff}

/* ============ Buttons ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:999px;font-weight:600;font-size:14.5px;cursor:pointer;
  padding:11px 22px;border:1px solid transparent;
  transition:opacity .2s,background .2s,border-color .2s,transform .15s;
  white-space:nowrap;
}
.btn:active{transform:scale(.97)}
.btn-solid{background:#fff;color:#000}
.btn-solid:hover{opacity:.85}
.btn-ghost{background:var(--accent-dim);color:#fff;border-color:var(--border)}
.btn-ghost:hover{border-color:var(--border-strong)}
.btn-sm{padding:8px 16px;font-size:13px}
.btn-lg{padding:14px 30px;font-size:16px}
.btn.wide{width:100%;margin-top:22px}

/* ============ Hero ============ */
.hero{padding:150px 0 70px;position:relative}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center}
.eyebrow{
  display:inline-block;font-family:var(--font-mono);font-size:12px;
  color:var(--text-dim);border:1px solid var(--border);border-radius:999px;
  padding:5px 12px;margin-bottom:22px;background:var(--accent-dim);
}
.hero h1{font-size:clamp(34px,5vw,54px);line-height:1.12;font-weight:700;letter-spacing:-.02em}
.lead{color:var(--text-dim);font-size:17px;max-width:52ch;margin:22px 0 30px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:12px;
  margin-top:44px;padding-top:28px;border-top:1px solid var(--border);
}
.hero-stats div{display:flex;flex-direction:column;gap:2px}
.hero-stats b{font-size:24px;font-weight:700;font-family:var(--font-mono);letter-spacing:-.02em}
.hero-stats span{font-size:12px;color:var(--text-mute)}

/* globe */
.hero-globe{position:relative;display:flex;justify-content:center}
.hero-globe canvas{max-width:100%;height:auto}
.globe-glow{
  position:absolute;inset:12%;
  background:radial-gradient(circle at 50% 50%,rgba(255,255,255,.10),rgba(255,255,255,.03) 45%,transparent 68%);
  border-radius:50%;pointer-events:none;
}

/* ============ Trust strip ============ */
.trust{border-top:1px solid var(--border);border-bottom:1px solid var(--border);background:var(--surface)}
.trust-grid{display:grid;grid-template-columns:repeat(3,1fr) 2fr;gap:24px;padding-top:30px;padding-bottom:30px;align-items:center}
.trust-grid b{display:block;font-size:22px;font-family:var(--font-mono);font-weight:700}
.trust-grid span{font-size:12.5px;color:var(--text-mute)}
.trust-note{font-size:13px;color:var(--text-mute);border-left:2px solid var(--border-strong);padding-left:16px}

/* ============ Sections ============ */
.section{padding:96px 0}
.section.alt{background:var(--surface)}
.section-head{max-width:640px;margin-bottom:48px}
.center .section-head{margin-left:auto;margin-right:auto}
.tag{
  font-family:var(--font-mono);font-size:12px;color:var(--text-mute);
  text-transform:uppercase;letter-spacing:.14em;margin-bottom:12px;
}
.section-head h2{font-size:clamp(26px,3.6vw,36px);font-weight:700;letter-spacing:-.015em;line-height:1.2}
.sub{color:var(--text-dim);margin-top:14px;font-size:16px}
.center .sub{margin-left:auto;margin-right:auto}

/* cards */
.card{
  background:var(--surface2);
  border:1px solid var(--border);
  border-radius:var(--r);
  padding:28px;
  transition:border-color .25s,transform .25s;
}
.section .card{background:var(--surface)}
.section.alt .card{background:#0b0b0b}
.card:hover{border-color:var(--border-strong);transform:translateY(-3px)}

/* ============ Tracks ============ */
.tracks-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.track-icon{
  width:44px;height:44px;border-radius:12px;background:var(--accent-dim);
  border:1px solid var(--border);display:flex;align-items:center;justify-content:center;
  font-size:20px;margin-bottom:18px;
}
.track h3{font-size:19px;margin-bottom:10px}
.track>p:not(.not-line){color:var(--text-dim);font-size:14.5px;margin-bottom:16px}
.track ul{display:flex;flex-direction:column;gap:9px;margin-bottom:18px}
.track li{font-size:14px;color:var(--text-dim);padding-left:20px;position:relative}
.track li::before{content:"—";position:absolute;left:0;color:var(--text-mute)}
.not-line{
  font-size:12.5px;color:var(--text-mute);border-top:1px dashed var(--border);
  padding-top:14px;font-family:var(--font-mono);
}

/* ============ Modules ============ */
.modules-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.mod{position:relative;display:flex;flex-direction:column;gap:10px}
.mod-no{
  font-family:var(--font-mono);font-size:12px;color:var(--text-mute);
  border:1px solid var(--border);border-radius:6px;padding:3px 8px;
  align-self:flex-start;margin-bottom:6px;
}
.mod h3{font-size:17px}
.mod>p:not(.after){color:var(--text-dim);font-size:14px;flex:1}
.mod .after{font-size:13px;color:var(--text-dim);border-top:1px solid var(--border);padding-top:12px;margin-top:4px}
.mod .after b{color:#fff;font-weight:600;margin-right:4px}

/* ============ Topics ============ */
.topics-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.topic h3{font-family:var(--font-mono);font-size:16px;margin-bottom:8px;letter-spacing:.01em}
.topic p{color:var(--text-dim);font-size:14px}

/* ============ Honest statement ============ */
.honest-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.honest h3{font-size:16px;margin-bottom:18px;font-family:var(--font-mono)}
.honest ul{display:flex;flex-direction:column;gap:13px}
.honest li{font-size:14.5px;color:var(--text-dim);padding-left:30px;position:relative}
.x-list li::before{content:"✕";position:absolute;left:0;color:var(--text-mute);font-weight:700}
.ok-list li::before{content:"✓";position:absolute;left:0;color:#9d9da3;font-weight:700}
.honest.ok{border-color:var(--border-strong)}

/* ============ Free materials ============ */
.free-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:22px;align-items:start}
.free-list{display:flex;flex-direction:column;gap:12px}
.free-item{
  display:flex;align-items:center;gap:16px;
  background:var(--surface2);border:1px solid var(--border);border-radius:var(--r);
  padding:18px 22px;transition:border-color .25s;
}
.section.alt .free-item{background:#0b0b0b}
.free-item:hover{border-color:var(--border-strong)}
.fi-ico{font-size:22px;filter:grayscale(.4)}
.free-item b{display:block;font-size:14.5px}
.fi-meta{font-family:var(--font-mono);font-size:11.5px;color:var(--text-mute)}
.qr-block{display:flex;flex-direction:column;align-items:center;gap:10px;padding:32px 28px;text-align:center}
#qrCanvas{border-radius:10px;margin-bottom:6px}
.qr-block p{font-size:14px}
.qr-sub{font-size:12px;color:var(--text-mute);font-family:var(--font-mono)}

/* ============ FAQ ============ */
.faq-list{display:flex;flex-direction:column;gap:12px}
.faq-item{padding:0;overflow:hidden}
.faq-q{
  width:100%;display:flex;justify-content:space-between;align-items:center;gap:16px;
  background:none;border:none;color:#fff;font-family:var(--font);font-size:15.5px;font-weight:600;
  text-align:left;padding:20px 24px;cursor:pointer;
}
.faq-plus{font-size:20px;color:var(--text-mute);transition:transform .3s;font-weight:400;font-family:var(--font-mono)}
.faq-item.open .faq-plus{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a p{color:var(--text-dim);font-size:14.5px;padding:0 24px 20px}
.faq-item:hover{transform:none}

/* ============ Final C=========== */
.final{padding:120px 0}
.final h2{font-size:clamp(30px,4.4vw,44px);letter-spacing:-.02em;line-height:1.15}
.final .sub{margin-bottom:34px}
.final .btn{margin-top:6px}

/* ============ Footer ============ */
footer{border-top:1px solid var(--border);background:var(--surface)}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px;padding-top:56px;padding-bottom:40px}
.foot-brand p{color:var(--text-mute);font-size:13.5px;margin-top:14px;max-width:34ch}
.foot-col h4{font-family:var(--font-mono);font-size:12px;color:var(--text-mute);text-transform:uppercase;letter-spacing:.12em;margin-bottom:14px}
.foot-col a{display:block;color:var(--text-dim);font-size:14px;padding:5px 0;transition:color .2s}
.foot-col a:hover{color:#fff}
.foot-legal{border-top:1px solid var(--border);padding-top:24px;padding-bottom:32px}
.foot-legal p{color:var(--text-mute);font-size:12px;line-height:1.7}
.foot-copy{margin-top:12px;font-family:var(--font-mono);font-size:11.5px}

/* ============ Modals ============ */
.modal{
  position:fixed;inset:0;z-index:150;
  background:rgba(0,0,0,.7);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  display:flex;align-items:center;justify-content:center;padding:20px;
  opacity:0;visibility:hidden;transition:opacity .25s,visibility .25s;
}
.modal.show{opacity:1;visibility:visible}
.modal-card{
  background:var(--surface);border:1px solid var(--border-strong);border-radius:20px;
  padding:36px 32px;max-width:440px;width:100%;position:relative;
  transform:translateY(14px) scale(.98);transition:transform .25s;
  box-shadow:0 30px 80px rgba(0,0,0,.7);
}
.modal.show .modal-card{transform:translateY(0) scale(1)}
.modal-card h3{font-size:20px;margin-bottom:12px;letter-spacing:-.01em}
.modal-card>p:not(.v-q){color:var(--text-dim);font-size:14.5px}
.modal-x{
  position:absolute;top:14px;right:16px;background:none;border:none;color:var(--text-mute);
  font-size:22px;cursor:pointer;line-height:1;padding:4px;
}
.modal-x:hover{color:#fff}
.modal-btns{display:flex;gap:12px;margin-top:26px;flex-wrap:wrap}
.modal-sm{max-width:340px;text-align:center}
.v-q{font-family:var(--font-mono);font-size:26px;font-weight:600;margin:20px 0 18px;letter-spacing:.04em}
.v-opts{display:flex;gap:10px;justify-content:center}
.v-opts button{
  min-width:64px;padding:10px 0;border-radius:10px;cursor:pointer;
  background:var(--accent-dim);border:1px solid var(--border);color:#fff;
  font-family:var(--font-mono);font-size:16px;transition:border-color .2s,background .2s;
}
.v-opts button:hover{border-color:var(--border-strong);background:rgba(255,255,255,.14)}
.v-err{
  color:#ff6b6b;font-size:12.5px;margin-top:14px;font-family:var(--font-mono);
  opacity:0;transition:opacity .2s;height:16px;
}
.v-err.show{opacity:1}

/* ============ Reveal on scroll ============ */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
.d1{transition-delay:.08s}
.d2{transition-delay:.16s}
.d3{transition-delay:.24s}
.d4{transition-delay:.32s}

/* ============ Responsive ============ */
@media(max-width:900px){
  .nav-links{display:none}
  .hero-grid{grid-template-columns:1fr}
  .hero-globe{order:-1;margin-bottom:6px}
  .hero-globe canvas{width:min(300px,80vw);height:auto}
  .hero{padding-top:110px}
  .modules-grid,.topics-grid{grid-template-columns:1fr 1fr}
  .trust-grid{grid-template-columns:1fr 1fr}
  .trust-note{grid-column:1/-1}
  .free-grid{grid-template-columns:1fr}
  .qr-block{max-width:320px;margin:0 auto}
}
@media(max-width:620px){
  .tracks-grid,.honest-grid,.modules-grid,.topics-grid{grid-template-columns:1fr}
  .hero-stats{grid-template-columns:1fr 1fr;gap:18px}
  .section{padding:64px 0}
  .final{padding:80px 0}
  .foot-grid{grid-template-columns:1fr;gap:28px}
  .lang-btn span#langLabel{display:none}
}
@media(prefers-reduced-motion:reduce){
  .reveal{transition:none;opacity:1;transform:none}
  html{scroll-behavior:auto}
}