:root{
  --bg:#0b0d10;
  --panel:#12161b;
  --panel2:#171c22;
  --panel3:#1d242c;
  --text:#eef2f6;
  --muted:#9aa6b2;
  --line:#2a333d;
  --line2:#384450;
  --accent:#d9ff63;
  --accent2:#9fe1ff;
  --warn:#ffd29a;
  --good:#a7f3d0;
  --max:1180px;
  --radius:12px;
  --radius-sm:8px;
}

*{box-sizing:border-box}

body{
  margin:0;
  background:radial-gradient(circle at top right,#17202b 0,#0b0d10 38%);
  color:var(--text);
  font:16px/1.78 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
}

.wrap{max-width:var(--max);margin:auto;padding:0 24px}

/* ── Top bar ── */
.top{
  position:sticky;top:0;z-index:20;
  background:rgba(11,13,16,.86);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.topin{height:64px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.top-left{display:flex;align-items:center;gap:12px}

.brand{color:#fff;text-decoration:none;font-weight:800;letter-spacing:.08em;font-size:15px}
.brand small{display:block;color:var(--muted);font-weight:500;font-size:11px;letter-spacing:.02em}

.btn{
  border:1px solid var(--line);
  padding:8px 16px;
  border-radius:999px;
  color:#fff;
  text-decoration:none;
  font-size:13px;
  background:transparent;
  cursor:pointer;
  transition:border-color .15s, background .15s;
  white-space:nowrap;
}
.btn:hover{border-color:var(--line2);background:var(--panel2)}
.btn.primary{background:var(--accent);color:#0b0d10;border-color:var(--accent);font-weight:600}
.btn.primary:hover{background:#c8ee52}

.mobile-menu-btn{
  display:none;
  background:none;border:none;color:#fff;font-size:20px;cursor:pointer;
  padding:8px 12px;
}

/* ── Hero ── */
.hero{padding:82px 0 50px}
.eyebrow{color:var(--accent);font-weight:800;letter-spacing:.12em;font-size:12px}
.hero h1{font-size:clamp(32px,6vw,72px);line-height:1.05;max-width:900px;margin:14px 0 20px;font-weight:800;letter-spacing:-.02em}
.hero p{font-size:18px;color:#c7d0d8;max-width:780px}

.hero-stat{
  margin-top:40px;
  padding:24px;
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  display:inline-block;
}
.hero-stat-num{font-size:48px;font-weight:800;color:var(--accent);line-height:1}
.hero-stat-label{color:var(--muted);font-size:14px;margin-top:6px}

/* ── Grid / Cards ── */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.home-grid{margin:40px 0 80px}

.card{
  display:block;
  background:linear-gradient(180deg,var(--panel2),var(--panel));
  border:1px solid var(--line);
  padding:22px;
  border-radius:16px;
  color:inherit;
  text-decoration:none;
  transition:border-color .15s, transform .15s;
}
.card:hover{border-color:#63707d;transform:translateY(-1px)}
.card b{color:var(--accent);font-size:12px;letter-spacing:.06em}
.card h3{margin:8px 0 8px;font-size:18px;line-height:1.4}
.card p{margin:0;color:var(--muted);font-size:14px;line-height:1.6}

.card-progress{
  display:flex;align-items:center;gap:10px;
  margin-top:16px;padding-top:14px;
  border-top:1px solid var(--line);
  font-size:12px;color:var(--muted);
}
.card-progress-bar{
  flex:1;height:4px;background:var(--line);border-radius:999px;overflow:hidden;
}
.card-progress-bar i{
  display:block;height:100%;background:var(--accent);border-radius:999px;
  transition:width .3s;
}

/* ── Layout (module pages) ── */
.layout{
  display:grid;
  grid-template-columns:260px minmax(0,1fr);
  gap:32px;
  padding-top:28px;
  padding-bottom:80px;
}

.side{
  position:sticky;top:84px;
  height:calc(100vh - 108px);
  overflow-y:auto;
  padding-right:4px;
  display:flex;flex-direction:column;
}
.side .eyebrow{margin-bottom:12px;padding:0 10px}

.side a{
  display:flex;align-items:center;gap:8px;
  color:var(--muted);text-decoration:none;
  padding:7px 10px;border-radius:8px;font-size:13px;
  line-height:1.4;
  transition:background .1s, color .1s;
}
.side a:hover{background:var(--panel2);color:#fff}
.side a.current{background:var(--panel3);color:#fff}
.side .nav-num{
  flex-shrink:0;
  width:24px;font-size:11px;color:var(--muted);
  font-family:ui-monospace,monospace;
}
.side a.current .nav-num{color:var(--accent)}
.side .nav-title{flex:1}
.side .nav-pct{
  flex-shrink:0;font-size:11px;color:var(--muted);
  font-family:ui-monospace,monospace;
}

.side-foot{
  margin-top:auto;
  padding:16px 10px 8px;
  border-top:1px solid var(--line);
  font-size:12px;
}
.total-progress{color:var(--muted);margin-bottom:8px}
.total-progress b{color:var(--accent);font-family:ui-monospace,monospace}
.side-foot .progressbar{margin-bottom:12px}

.side-actions{
  display:flex;gap:8px;flex-wrap:wrap;
  margin-top:8px;
}
.btn-text{
  background:none;border:1px solid var(--line);border-radius:6px;
  color:var(--muted);font-size:11px;padding:4px 10px;
  cursor:pointer;
}
.btn-text:hover{color:#fff;border-color:var(--line2)}

/* ── Content ── */
.content{min-width:0}
.content h1{font-size:clamp(28px,4vw,42px);line-height:1.2;margin:12px 0 10px;font-weight:800;letter-spacing:-.01em}
.lead{font-size:18px;color:#c7d0d8;margin:0 0 32px}

.lesson{margin-bottom:28px}
.lesson h2{font-size:22px;margin:0 0 12px;font-weight:700}
.lesson p{margin:0 0 14px;color:#d5dde5}

pre{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  padding:16px 18px;
  overflow-x:auto;
  font-size:13px;
  line-height:1.65;
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  position:relative;
}
code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9em}
:not(pre) > code{
  background:var(--panel2);
  border:1px solid var(--line);
  padding:2px 6px;
  border-radius:4px;
  font-size:.88em;
}

.copy-btn{
  position:absolute;top:8px;right:8px;
  background:var(--panel3);
  border:1px solid var(--line);
  color:var(--muted);
  padding:4px 10px;
  border-radius:6px;
  font-size:11px;
  cursor:pointer;
  opacity:0;
  transition:opacity .15s;
}
pre:hover .copy-btn{opacity:1}
.copy-btn:hover{color:#fff;border-color:var(--line2)}

.glossary-link{
  color:var(--accent2);
  text-decoration:none;
  border-bottom:1px dashed rgba(159,225,255,.3);
}
.glossary-link:hover{border-bottom-color:var(--accent2)}

/* ── Lab / Tasks ── */
.lab{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:22px 24px;
  margin:32px 0;
}
.lab h2{font-size:18px;margin:0 0 16px;color:var(--accent)}

.check{
  display:flex;align-items:flex-start;gap:10px;
  padding:8px 0;
  cursor:pointer;
  font-size:14px;
  color:#d5dde5;
}
.check input{margin-top:5px;accent-color:var(--accent)}
.check input:checked + span{color:var(--muted);text-decoration:line-through}

/* ── Errors ── */
.errors{
  background:rgba(255,210,154,.06);
  border:1px solid rgba(255,210,154,.2);
  border-radius:var(--radius);
  padding:20px 24px;
  margin:24px 0;
}
.errors h2{font-size:16px;margin:0 0 12px;color:var(--warn)}
.errors ul{margin:0;padding-left:20px}
.errors li{margin:6px 0;color:#d5dde5;font-size:14px}
.errors details summary{cursor:pointer;outline:none}
.errors details p{
  margin:8px 0 4px;
  color:var(--muted);
  font-size:13px;
  padding-left:14px;
  border-left:2px solid rgba(255,210,154,.3);
}

/* ── Deliver ── */
.deliver{
  background:rgba(217,255,99,.06);
  border:1px solid rgba(217,255,99,.2);
  border-radius:var(--radius);
  padding:20px 24px;
  margin:24px 0;
}
.deliver h2{font-size:16px;margin:0 0 8px;color:var(--accent)}
.deliver p{margin:0;color:#d5dde5;font-size:14px}

/* ── Progress bar ── */
.progressbar{
  height:6px;background:var(--line);border-radius:999px;overflow:hidden;
  margin:8px 0 24px;
}
.progressbar i{
  display:block;height:100%;
  background:var(--accent);border-radius:999px;
  transition:width .3s;
}

.content .progressbar{max-width:400px}

/* ── Pager ── */
.pager{
  display:flex;justify-content:space-between;
  margin-top:48px;padding-top:24px;
  border-top:1px solid var(--line);
}
.pager a{
  color:var(--muted);text-decoration:none;
  padding:8px 16px;border-radius:8px;
  border:1px solid var(--line);
  font-size:14px;
  transition:color .15s, border-color .15s;
}
.pager a:hover{color:#fff;border-color:var(--line2)}

/* ── 30 day table ── */
.table{
  width:100%;
  border-collapse:collapse;
  margin:32px 0;
  font-size:14px;
}
.table th{
  text-align:left;
  padding:12px 16px;
  border-bottom:2px solid var(--line);
  color:var(--muted);
  font-weight:600;
  font-size:12px;
  text-transform:uppercase;
  letter-spacing:.06em;
}
.table td{
  padding:12px 16px;
  border-bottom:1px solid var(--line);
  vertical-align:top;
}
.table tr:hover td{background:var(--panel2)}

/* ── Search overlay ── */
.search-overlay{
  position:fixed;inset:0;z-index:100;
  background:rgba(0,0,0,.6);
  backdrop-filter:blur(8px);
  display:none;
  align-items:flex-start;
  justify-content:center;
  padding-top:15vh;
}
.search-overlay.open{display:flex}
.search-box{
  width:min(640px,90vw);
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  overflow:hidden;
  box-shadow:0 24px 48px rgba(0,0,0,.4);
}
.search-box input{
  width:100%;
  padding:18px 22px;
  background:var(--panel2);
  border:none;
  border-bottom:1px solid var(--line);
  color:#fff;
  font-size:16px;
  outline:none;
}
.search-results{max-height:50vh;overflow-y:auto}
.search-item{
  display:block;
  padding:14px 22px;
  text-decoration:none;
  color:inherit;
  border-bottom:1px solid var(--line);
}
.search-item:hover{background:var(--panel2)}
.search-item-title{font-weight:600;font-size:14px;margin-bottom:4px}
.search-item-snippet{font-size:13px;color:var(--muted);line-height:1.5}
.search-item-snippet mark{
  background:var(--accent);color:#0b0d10;
  padding:1px 3px;border-radius:3px;
}
.search-empty{padding:32px;text-align:center;color:var(--muted);font-size:14px}

/* ── Mobile drawer ── */
.drawer-overlay{
  position:fixed;inset:0;z-index:25;
  background:rgba(0,0,0,.5);
  display:none;
}
.side.open + .drawer-overlay,
body.drawer-open .drawer-overlay{
  display:block;
}

/* ── Login Modal ── */
.login-modal{
  position:fixed;inset:0;z-index:100;
  background:rgba(0,0,0,.6);
  backdrop-filter:blur(8px);
  display:none;
  align-items:center;justify-content:center;
}
.login-modal.open{display:flex}
.login-box{
  width:min(400px,90vw);
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:28px;
}
.login-box h3{margin:0 0 8px;font-size:20px}
.login-box p{margin:0 0 20px;color:var(--muted);font-size:14px}
.login-box input[type=email]{
  width:100%;
  padding:12px 14px;
  background:var(--panel2);
  border:1px solid var(--line);
  border-radius:8px;
  color:#fff;
  font-size:15px;
  margin-bottom:12px;
  outline:none;
}
.login-box input[type=email]:focus{border-color:var(--accent)}
.login-box .hint{font-size:12px;color:var(--muted);margin-top:8px;text-align:center}

/* ── Footer ── */
.footer{
  border-top:1px solid var(--line);
  padding:24px 0;
  color:var(--muted);
  font-size:13px;
  text-align:center;
}

/* ── Responsive ── */
@media (max-width: 960px){
  .grid{grid-template-columns:repeat(2,1fr)}
}

@media (max-width: 768px){
  .layout{
    grid-template-columns:1fr;
    padding-top:16px;
  }
  .side{
    position:fixed;
    top:0;left:0;bottom:0;
    width:280px;
    height:100vh;
    background:var(--panel);
    border-right:1px solid var(--line);
    z-index:30;
    transform:translateX(-100%);
    transition:transform .25s;
    padding:20px 16px;
  }
  .side.open{transform:translateX(0)}
  .mobile-menu-btn{display:block}

  .hero{padding:48px 0 32px}
  .hero h1{font-size:32px}
  .hero p{font-size:16px}
  .hero-stat{padding:16px}
  .hero-stat-num{font-size:36px}

  .grid{grid-template-columns:1fr}
  .home-grid{margin:24px 0 60px}

  .content h1{font-size:26px}
  .lead{font-size:16px;margin-bottom:24px}
  .lesson h2{font-size:18px}

  .lab,.errors,.deliver{padding:16px}
  .lab h2{font-size:16px}

  .table{font-size:12px}
  .table th,.table td{padding:8px 10px}
}

@media (max-width: 480px){
  .wrap{padding:0 16px}
  .topin{height:56px}
  .brand{font-size:13px}
  .brand small{display:none}
  .btn{padding:6px 12px;font-size:12px}
}