.dsa-academy{
  --ground:#FBFAF6; --surface:#FFFFFF; --surface-2:#F4F2EA;
  --ink:#141631; --navy:#191C4A; --navy-deep:#111330; --muted:#6E6C7E;
  --gold:#D7B428; --gold-soft:#FBF3D3;
  --teal:#21759B; --teal-soft:#E9F2F7;
  --green:#1D9E75; --green-soft:#E7F5F0;
  --amber:#B5761A; --amber-soft:#FCF2E2;
  --line:#E4E0D4; --line-soft:#EFECE3;
  --r-card:14px; --r-btn:8px;
  --shadow:0 1px 2px rgba(20,22,49,.04),0 8px 28px rgba(20,22,49,.06);
  --shadow-lift:0 2px 4px rgba(20,22,49,.06),0 18px 44px rgba(20,22,49,.10);
  --sans:'Open Sans',system-ui,-apple-system,sans-serif;
  --display:'Montserrat',system-ui,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,'SF Mono',monospace;
}
.dsa-academy *,.dsa-academy *::before,.dsa-academy *::after{box-sizing:border-box}
.dsa-academy{scroll-behavior:smooth}
.dsa-academy{margin:0; background:var(--ground); color:var(--ink);
  font-family:var(--sans); font-size:17px; line-height:1.75; -webkit-font-smoothing:antialiased}
.dsa-academy h1,.dsa-academy h2,.dsa-academy h3{font-family:var(--display); text-wrap:balance; margin:0}
.dsa-academy a{color:var(--teal)}
.dsa-academy p{margin:0 0 22px}
.dsa-academy strong{font-weight:600}
.dsa-academy :focus-visible{outline:2.5px solid var(--teal); outline-offset:3px; border-radius:3px}
.dsa-academy .wrap{max-width:1180px; margin:0 auto; padding:0 24px}
.dsa-academy .label{font-family:var(--mono); font-size:11px; font-weight:600; letter-spacing:.12em;
  text-transform:uppercase; color:var(--muted); margin:0 0 12px}
.dsa-academy .bar{position:sticky; top:0; z-index:40; background:var(--surface);
  border-bottom:1px solid var(--line); transition:box-shadow .25s ease}
.dsa-academy .bar.lifted{box-shadow:0 1px 14px rgba(20,22,49,.10)}
.dsa-academy .bar-in{display:flex; align-items:center; justify-content:space-between; gap:20px; height:66px}
.dsa-academy .brand{display:flex; align-items:baseline; gap:10px; text-decoration:none; color:var(--ink)}
.dsa-academy .brand b{font-family:var(--display); font-weight:800; font-size:16px; letter-spacing:-.2px}
.dsa-academy .brand span{font-family:var(--mono); font-size:11px; color:var(--muted); letter-spacing:.06em}
.dsa-academy .nav{display:flex; gap:4px; list-style:none; margin:0; padding:0}
.dsa-academy .nav a{font-family:var(--display); font-size:12px; font-weight:600; letter-spacing:.4px;
  text-transform:uppercase; color:var(--muted); text-decoration:none; padding:8px 12px;
  border-radius:var(--r-btn); transition:color .18s ease}
.dsa-academy .nav a:hover,.dsa-academy .nav a[aria-current]{color:var(--navy)}
.dsa-academy .crumb{font-family:var(--mono); font-size:11.5px; color:var(--muted); letter-spacing:.02em;
  overflow:hidden; text-overflow:ellipsis; white-space:nowrap}
.dsa-academy .crumb a{color:var(--muted); text-decoration:none}
.dsa-academy .crumb a:hover{color:var(--teal)}
.dsa-academy .themebtn{font-family:var(--mono); font-size:11px; letter-spacing:.06em; color:var(--muted);
  background:none; border:1px solid var(--line); border-radius:999px;
  padding:6px 13px; cursor:pointer; transition:all .18s ease}
.dsa-academy .themebtn:hover{border-color:var(--teal); color:var(--teal)}
.dsa-academy .hero{background:var(--navy-deep); color:#EDEBF3; padding:76px 0 84px; position:relative; overflow:hidden}
.dsa-academy .hero::after{content:''; position:absolute; inset:0; pointer-events:none;
  background:radial-gradient(circle at 78% 22%, rgba(215,180,40,.10), transparent 58%),
             radial-gradient(circle at 8% 88%, rgba(33,117,155,.14), transparent 52%)}
.dsa-academy .hero-in{position:relative; z-index:2; display:grid; grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);
  gap:64px; align-items:end}
.dsa-academy .hero .label{color:var(--gold)}
.dsa-academy .hero h1{font-size:clamp(34px,5.2vw,58px); font-weight:800; line-height:1.05;
  letter-spacing:-.03em; color:#FFFFFF; max-width:16ch}
.dsa-academy .hero p{margin:22px 0 0; font-size:19.5px; line-height:1.6; color:rgba(237,235,243,.72); max-width:48ch}
.dsa-academy .hero-side{border-left:3px solid var(--gold); padding-left:22px}
.dsa-academy .hero-side p{margin:0 0 14px; font-size:15px; line-height:1.7; color:rgba(237,235,243,.66)}
.dsa-academy .hero-side p:last-child{margin:0}
.dsa-academy .hero-side b{color:var(--gold); font-weight:600}
.dsa-academy section{padding:74px 0}
.dsa-academy .alt{background:var(--surface-2)}
.dsa-academy .sec-head{margin-bottom:38px}
.dsa-academy h2{font-size:clamp(26px,3.4vw,38px); font-weight:800; line-height:1.16; letter-spacing:-.024em;
  color:var(--navy); max-width:24ch}
.dsa-academy .sec-head p{margin:16px 0 0; font-size:18px; color:var(--muted); max-width:58ch; line-height:1.65}
.dsa-academy .btn{display:inline-flex; align-items:center; gap:9px; white-space:nowrap;
  background:var(--teal); color:#FFFFFF; text-decoration:none; padding:16px 30px;
  border-radius:var(--r-btn); font-family:var(--display); font-weight:700; font-size:14.5px;
  letter-spacing:.02em; transition:transform .14s ease, box-shadow .14s ease}
.dsa-academy .btn:hover{transform:translateY(-1px); box-shadow:0 14px 34px rgba(33,117,155,.30)}
.dsa-academy .btn:active{transform:translateY(0) scale(.985)}
.dsa-academy .btn svg{width:15px;height:15px;fill:currentColor}
.dsa-academy .btn-navy{background:#191C4A}
.dsa-academy .btn-navy:hover{box-shadow:0 14px 34px rgba(25,28,74,.28)}
.dsa-academy .btn-ghost{background:none; color:var(--navy); border:1.5px solid var(--line)}
.dsa-academy .btn-ghost:hover{border-color:var(--teal); color:var(--teal); box-shadow:none}
.dsa-academy .pill{display:inline-block; font-family:var(--mono); font-size:10.5px; font-weight:600;
  letter-spacing:.09em; text-transform:uppercase; padding:5px 12px; border-radius:999px; white-space:nowrap}
.dsa-academy .pill-live{background:var(--green-soft); color:var(--green)}
.dsa-academy .pill-soon{background:var(--gold-soft); color:var(--amber)}
.dsa-academy .pill-next{background:var(--surface-2); color:var(--muted)}
.dsa-academy .alt .pill-next{background:var(--surface); color:var(--muted)}
.dsa-academy .steps{display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:20px}
.dsa-academy .step{background:var(--surface); border:1px solid var(--line); border-radius:var(--r-card);
  padding:30px 28px; position:relative}
.dsa-academy .step .n{font-family:var(--mono); font-size:11px; font-weight:600; letter-spacing:.12em;
  text-transform:uppercase; color:var(--teal); margin-bottom:10px}
.dsa-academy .step:nth-child(2) .n{color:var(--amber)}
.dsa-academy .step:nth-child(3) .n{color:var(--green)}
.dsa-academy .step h3{font-size:19px; font-weight:700; color:var(--navy); margin-bottom:10px}
.dsa-academy .step p{margin:0; font-size:15px; line-height:1.7; color:var(--muted)}
.dsa-academy .feature{background:var(--surface); border:1px solid var(--line); border-left:4px solid var(--gold);
  border-radius:var(--r-card); box-shadow:var(--shadow); overflow:hidden}
.dsa-academy .feature-in{display:grid; grid-template-columns:minmax(0,1.15fr) minmax(0,1fr); gap:0}
.dsa-academy .feature-l{padding:40px 40px 36px}
.dsa-academy .feature-r{padding:40px 36px; background:var(--surface-2); border-left:1px solid var(--line)}
.dsa-academy .feature .meta{display:flex; flex-wrap:wrap; gap:8px; margin-bottom:16px}
.dsa-academy .feature h3{font-size:clamp(23px,2.7vw,30px); font-weight:800; letter-spacing:-.02em;
  color:var(--navy); margin-bottom:14px; max-width:18ch}
.dsa-academy .feature p{font-size:16.5px; color:var(--muted); margin:0 0 22px}
.dsa-academy .feature-r h4{font-family:var(--mono); font-size:11px; font-weight:600; letter-spacing:.1em;
  text-transform:uppercase; color:var(--muted); margin:0 0 14px}
.dsa-academy .mini{list-style:none; margin:0 0 24px; padding:0; counter-reset:m}
.dsa-academy .mini li{counter-increment:m; position:relative; padding:0 0 11px 34px;
  font-size:15px; line-height:1.6; color:var(--ink)}
.dsa-academy .mini li:last-child{padding-bottom:0}
.dsa-academy .mini li::before{content:counter(m); position:absolute; left:0; top:1px;
  width:23px; height:23px; border-radius:50%; background:var(--gold-soft); color:var(--amber);
  font-family:var(--mono); font-size:11px; font-weight:600;
  display:flex; align-items:center; justify-content:center}
.dsa-academy .stage{margin-bottom:52px}
.dsa-academy .stage:last-child{margin-bottom:0}
.dsa-academy .stage-head{display:flex; align-items:baseline; justify-content:space-between; gap:20px;
  flex-wrap:wrap; padding-bottom:14px; border-bottom:2px solid var(--navy)}
.dsa-academy .stage-head h3{font-size:24px; font-weight:800; letter-spacing:-.02em; color:var(--navy)}
.dsa-academy .stage-head span{font-size:15.5px; color:var(--muted)}
.dsa-academy .courses{width:100%; border-collapse:separate; border-spacing:0; font-size:16px;
  margin-top:18px; background:var(--surface); border:1px solid var(--navy);
  border-radius:var(--r-card); overflow:hidden; box-shadow:var(--shadow)}
.dsa-academy .courses td{padding:16px 18px; border:0; border-bottom:1px solid var(--line-soft);
  vertical-align:middle; background:transparent}
.dsa-academy .courses tr:last-child td{border-bottom:none}
.dsa-academy .courses .num{font-family:var(--mono); font-size:12px; color:var(--muted);
  width:52px; white-space:nowrap; text-align:center}
.dsa-academy .courses b{font-weight:700; color:var(--navy); display:block; line-height:1.3}
.dsa-academy .courses a{text-decoration:none}
.dsa-academy .courses a b{color:var(--teal)}
.dsa-academy .courses small{display:block; margin-top:3px; color:var(--muted); font-size:14px; line-height:1.5}
.dsa-academy .courses .st{text-align:right; width:134px; white-space:nowrap}
.dsa-academy .courses tr.on td{background:var(--gold-soft)}
.dsa-academy .courses tr.on td:first-child{box-shadow:inset 3px 0 0 var(--gold)}
.dsa-academy .courses tr.on .num{color:var(--amber)}
.dsa-academy .courses tr.on b,.dsa-academy .courses tr.on a b{color:var(--amber)}
.dsa-academy .courses tr.on:hover a b{text-decoration:underline}
.dsa-academy .courses .pill-next{background:var(--navy); color:#FFFFFF}
.dsa-academy .panel{background:var(--navy); color:#EDEBF3; border-radius:var(--r-card); padding:46px 44px}
.dsa-academy .panel-in{display:grid; grid-template-columns:minmax(0,1fr) auto; gap:40px; align-items:center}
.dsa-academy .panel h2{color:#FFFFFF; max-width:20ch}
.dsa-academy .panel p{color:rgba(237,235,243,.74); font-size:17px; max-width:56ch; margin:16px 0 0}
.dsa-academy .panel .label{color:var(--gold)}
.dsa-academy .panel .btn{background:var(--gold); color:#191C4A}
.dsa-academy .panel .btn:hover{box-shadow:0 14px 34px rgba(215,180,40,.32)}
.dsa-academy .lessons{display:flex; flex-direction:column; gap:14px; counter-reset:l}
.dsa-academy .lesson{counter-increment:l; display:grid; grid-template-columns:60px minmax(0,1fr) auto;
  gap:24px; align-items:center; background:var(--surface); border:1px solid var(--line);
  border-radius:var(--r-card); padding:24px 26px; text-decoration:none; color:inherit;
  transition:border-color .16s ease, box-shadow .16s ease, transform .16s ease}
.dsa-academy .lesson:hover{border-color:var(--teal); box-shadow:var(--shadow-lift); transform:translateY(-2px)}
.dsa-academy .lesson .idx{font-family:var(--display); font-size:30px; font-weight:800; color:var(--line);
  line-height:1; letter-spacing:-.03em}
.dsa-academy .lesson:hover .idx{color:var(--teal)}
.dsa-academy .lesson h3{font-size:19px; font-weight:700; color:var(--navy); margin-bottom:6px}
.dsa-academy .lesson p{margin:0 0 10px; font-size:15.5px; color:var(--muted); line-height:1.6}
.dsa-academy .lesson .art{font-family:var(--mono); font-size:11px; font-weight:600; letter-spacing:.08em;
  text-transform:uppercase; color:var(--teal); background:var(--teal-soft);
  padding:5px 11px; border-radius:999px; display:inline-block}
.dsa-academy .lesson .go{font-family:var(--mono); font-size:11.5px; color:var(--muted); white-space:nowrap}
.dsa-academy .lesson:hover .go{color:var(--teal)}
.dsa-academy .facts{display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:1px;
  background:var(--line); border:1px solid var(--line); border-radius:var(--r-card); overflow:hidden}
.dsa-academy .fact{background:var(--surface); padding:24px 22px}
.dsa-academy .fact .v{font-family:var(--display); font-size:26px; font-weight:800; color:var(--navy);
  letter-spacing:-.02em; line-height:1.1; margin-bottom:6px}
.dsa-academy .fact .k{font-size:14.5px; color:var(--muted); line-height:1.55}
.dsa-academy .note{background:var(--teal-soft); border-left:3px solid var(--teal); border-radius:0 var(--r-card) var(--r-card) 0;
  padding:24px 26px; margin:0}
.dsa-academy .note p{margin:0; font-size:16px; color:var(--ink)}
.dsa-academy .note p+p{margin-top:14px}
.dsa-academy .join{text-align:center; padding:78px 0 82px}
.dsa-academy .join h2{margin:0 auto 16px; max-width:24ch}
.dsa-academy .join p{margin:0 auto 30px; max-width:52ch; color:var(--muted); font-size:18px}
.dsa-academy .join small{display:block; margin-top:18px; font-family:var(--mono); font-size:12px; color:var(--muted)}
.dsa-academy .foot{background:var(--navy-deep); color:rgba(237,235,243,.42); padding:34px 0}
.dsa-academy .foot-in{display:flex; justify-content:space-between; gap:18px; flex-wrap:wrap;
  font-family:var(--mono); font-size:11.5px}
.dsa-academy .foot a{color:rgba(237,235,243,.42); text-decoration:none}
.dsa-academy .foot a:hover{color:var(--gold)}
.dsa-academy .todo{background:#FFF4F4; border:1.5px dashed #C4443A; border-radius:var(--r-card);
  padding:16px 20px; margin:0 0 26px; font-size:14.5px; line-height:1.65; color:#7A2A24}
.dsa-academy .todo b{font-family:var(--mono); font-size:11px; letter-spacing:.09em; text-transform:uppercase;
  display:block; margin-bottom:6px}
@media (max-width:940px){.dsa-academy .hero-in,.dsa-academy .steps,.dsa-academy .feature-in,.dsa-academy .panel-in,.dsa-academy .facts{grid-template-columns:1fr; gap:34px}
.dsa-academy .facts{gap:1px}
.dsa-academy .feature-r{border-left:none; border-top:1px solid var(--line)}
.dsa-academy .feature-l,.dsa-academy .feature-r{padding:30px 26px}
.dsa-academy .nav{display:none}
.dsa-academy .hero-side{border-left:none; border-top:3px solid var(--gold); padding:22px 0 0}
.dsa-academy .lesson{grid-template-columns:44px minmax(0,1fr); gap:16px}
.dsa-academy .lesson .go{display:none}
}@media (max-width:560px){.dsa-academy{font-size:16.5px}
.dsa-academy .wrap{padding:0 18px}
.dsa-academy section{padding:52px 0}
.dsa-academy .hero{padding:52px 0 58px}
.dsa-academy .panel{padding:32px 24px}
.dsa-academy .btn{width:100%; justify-content:center}
.dsa-academy .courses td{padding:14px 14px}
.dsa-academy .courses .num{width:40px}
.dsa-academy .courses .st{width:auto}
}@media (prefers-reduced-motion:reduce){.dsa-academy *{transition:none!important; animation:none!important}
}
.dsa-academy{display:flow-root;background:var(--ground);padding-bottom:40px}.dsa-academy .do{opacity:1!important;transform:none!important}.dsa-academy .rail{top:100px}.dsa-academy .academy-crumb{padding-top:20px;padding-bottom:12px}.dsa-academy .completion-form{margin:20px 0}.dsa-academy .progress-note{margin:16px 0}.dsa-academy .lessons ol a{color:inherit;text-decoration:none}.dsa-academy .lessons ol a:hover{text-decoration:underline}.dsa-academy .source-note{font-size:14px;padding:18px;border-top:1px solid var(--line)}.dsa-academy .tbl{display:block;overflow-x:auto}.dsa-academy .track>*{min-width:0}.dsa-academy .chip{white-space:normal}.dsa-academy .mark{white-space:normal}.dsa-academy .progress-panel{padding:24px;background:var(--surface);border:1px solid var(--line);border-radius:14px;margin:24px auto}.dsa-academy .progress-panel a{color:var(--teal)}
/* Clickable lesson links in the featured-course lists */
.dsa-academy .mini li a{color:var(--teal); text-decoration:none}
.dsa-academy .mini li a:hover{text-decoration:underline}