:root{
  --bg: #0a0e13;
  --panel: #10161d;
  --panel-2: #141c24;
  --line: #202a34;
  --text: #dde6ee;
  --muted: #7e8b98;
  --amber: #ffb454;
  --amber-dim: #8a6a3a;
  --cipher: #58a6ff;
  --danger: #f85149;
  --ok: #7ee787;
  --mono: 'IBM Plex Mono', monospace;
  --sans: 'IBM Plex Sans', sans-serif;
  --hero-overlay: rgba(10,14,19,0.55);
  --hero-fallback: radial-gradient(circle at 30% 20%, #1a2530, #05070a 70%);
}

html[data-theme="light"]{
  --bg: #f5f3ee;
  --panel: #ffffff;
  --panel-2: #f0ede5;
  --line: #ddd6c9;
  --text: #23201b;
  --muted: #6b6357;
  --amber-dim: #d9a75c;
  --danger: #c62828;
  --ok: #2e7d32;
  --hero-overlay: rgba(245,243,238,0.6);
  --hero-fallback: radial-gradient(circle at 30% 20%, #ece6d8, #d9d0bc 70%);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0; background:var(--bg); color:var(--text);
  font-family:var(--sans); line-height:1.6;
  transition:background .25s ease, color .25s ease;
}
::selection{background:var(--amber); color:#1a1200;}
a{color:var(--cipher);}
code, .mono{font-family:var(--mono);}
button{font-family:inherit;}

a:focus-visible, button:focus-visible, .tab:focus-visible, input:focus-visible{
  outline:2px solid var(--amber); outline-offset:3px;
}

.wrap{max-width:1080px; margin:0 auto; padding:0 24px;}

/* NAV */
nav{
  position:sticky; top:0; z-index:50;
  backdrop-filter:blur(10px); background:color-mix(in srgb, var(--bg) 85%, transparent);
  border-bottom:1px solid var(--line);
}
nav .wrap{display:flex; align-items:center; justify-content:space-between; height:60px;}
.brand{font-family:var(--mono); font-weight:700; font-size:14px; letter-spacing:0.5px; color:var(--text);}
.brand span{color:var(--amber);}
.navlinks{display:flex; align-items:center; gap:22px; font-family:var(--mono); font-size:13px;}
.navlinks a{color:var(--muted); text-decoration:none;}
.navlinks a:hover{color:var(--amber);}
.icon-btn{
  background:none; border:1px solid var(--line); border-radius:8px; cursor:pointer;
  font-size:16px; width:36px; height:36px; display:flex; align-items:center; justify-content:center;
  color:var(--text);
}
.icon-btn:hover{border-color:var(--amber);}
@media (max-width:760px){.navlinks a.hide-mobile{display:none;}}

/* HERO */
.hero{position:relative; border-bottom:1px solid var(--line); overflow:hidden;}
.hero-media{
  position:absolute; inset:0; z-index:0; background:var(--hero-fallback); background-size:cover;
}
.hero-media video{
  width:100%; height:100%; object-fit:cover; display:block;
}
.hero-media.video-off video{display:none;}
.hero-overlay{position:absolute; inset:0; background:var(--hero-overlay); z-index:1;}
.hero-inner{position:relative; z-index:2; padding:90px 0 60px;}

.eyebrow{
  font-family:var(--mono); font-size:12px; color:var(--amber);
  letter-spacing:2px; text-transform:uppercase; margin-bottom:18px;
}
h1{
  font-family:var(--mono); font-weight:700;
  font-size:clamp(30px, 6vw, 54px); line-height:1.06; margin:0 0 20px;
  letter-spacing:-1px;
}
h1 em{font-style:normal; color:var(--amber);}
.lede{font-size:18px; color:var(--muted); max-width:600px; margin-bottom:36px;}

.terminal{
  background:var(--panel); border:1px solid var(--line); border-radius:8px;
  overflow:hidden; max-width:640px; box-shadow:0 20px 60px rgba(0,0,0,0.4);
}
.term-bar{
  display:flex; align-items:center; gap:8px; padding:10px 14px;
  background:var(--panel-2); border-bottom:1px solid var(--line);
}
.dot{width:10px; height:10px; border-radius:50%;}
.dot.r{background:#ff5f57;} .dot.y{background:#febc2e;} .dot.g{background:#28c840;}
.term-title{margin-left:8px; font-family:var(--mono); font-size:12px; color:var(--muted);}
.term-body{padding:20px; font-family:var(--mono); font-size:13.5px; min-height:210px;}
.term-body .prompt{color:var(--ok);}
.term-body .out{color:var(--muted);}
.term-line{white-space:pre-wrap; margin:0 0 4px;}
.caret{display:inline-block; width:8px; background:var(--amber); animation:blink 1s step-end infinite;}
@keyframes blink{50%{opacity:0;}}

section{padding:70px 0; border-bottom:1px solid var(--line);}
.section-head{margin-bottom:44px;}
.section-num{font-family:var(--mono); color:var(--amber-dim); font-size:13px; letter-spacing:1px;}
h2{font-family:var(--mono); font-size:clamp(24px,4vw,34px); margin:8px 0 0; letter-spacing:-0.5px;}
.section-sub{color:var(--muted); max-width:640px; margin-top:12px;}

/* TIMELINE */
.timeline{position:relative; padding-left:28px; border-left:2px solid var(--line);}
.tl-item{position:relative; padding-bottom:36px;}
.tl-item:last-child{padding-bottom:0;}
.tl-item::before{
  content:''; position:absolute; left:-35px; top:4px; width:10px; height:10px;
  border-radius:50%; background:var(--amber); box-shadow:0 0 0 4px var(--bg), 0 0 0 5px var(--line);
}
.tl-year{font-family:var(--mono); color:var(--amber); font-weight:600; font-size:15px;}
.tl-title{font-weight:600; margin:4px 0 6px;}
.tl-text{color:var(--muted); font-size:15px; max-width:620px;}

/* ALGO CARDS */
.algo-grid{display:grid; grid-template-columns:repeat(auto-fit,minmax(260px,1fr)); gap:20px;}
.algo-card{
  background:var(--panel); border:1px solid var(--line); border-radius:10px; padding:22px;
  display:flex; flex-direction:column; gap:12px;
}
.algo-card.best{border-color:var(--amber-dim); background:linear-gradient(180deg, color-mix(in srgb, var(--amber) 8%, transparent), var(--panel) 40%);}
.algo-card.dead{opacity:0.6;}
.algo-top{display:flex; justify-content:space-between; align-items:flex-start;}
.algo-name{font-family:var(--mono); font-size:18px; font-weight:700;}
.badge{font-family:var(--mono); font-size:10.5px; padding:3px 8px; border-radius:20px; letter-spacing:0.5px; white-space:nowrap;}
.badge.ok{background:color-mix(in srgb, var(--ok) 15%, transparent); color:var(--ok); border:1px solid color-mix(in srgb, var(--ok) 35%, transparent);}
.badge.warn{background:color-mix(in srgb, var(--amber) 15%, transparent); color:var(--amber); border:1px solid color-mix(in srgb, var(--amber) 35%, transparent);}
.badge.no{background:color-mix(in srgb, var(--danger) 15%, transparent); color:var(--danger); border:1px solid color-mix(in srgb, var(--danger) 35%, transparent);}
.algo-meta{font-family:var(--mono); font-size:12px; color:var(--muted); display:flex; gap:14px; flex-wrap:wrap;}
.algo-text{color:var(--muted); font-size:14px;}
.randomart{
  font-family:var(--mono); font-size:11px; line-height:1.35; background:color-mix(in srgb, var(--bg) 90%, black);
  border:1px solid var(--line); border-radius:6px; padding:10px; color:var(--amber-dim);
  white-space:pre; overflow-x:auto;
}

/* TABS / PANELS (Plattformen + Playground) */
.tabs{display:flex; gap:6px; flex-wrap:wrap; margin-bottom:20px;}
.tab{
  font-family:var(--mono); font-size:13px; padding:9px 16px; border-radius:6px;
  border:1px solid var(--line); background:var(--panel); color:var(--muted); cursor:pointer;
}
.tab.active{color:var(--bg); background:var(--amber); border-color:var(--amber); font-weight:600;}
.panel{display:none; background:var(--panel); border:1px solid var(--line); border-radius:10px; padding:26px;}
.panel.active{display:block;}
.panel h3{font-family:var(--mono); margin-top:0; font-size:16px; color:var(--text);}
.panel p{color:var(--muted); font-size:14.5px;}
pre{
  background:color-mix(in srgb, var(--bg) 90%, black); border:1px solid var(--line); border-radius:8px; padding:16px;
  overflow-x:auto; font-family:var(--mono); font-size:13px; color:var(--text); margin:14px 0;
}
pre .c{color:var(--muted);}
.note{
  font-size:13.5px; border-left:3px solid var(--cipher); padding:8px 14px; background:color-mix(in srgb, var(--cipher) 8%, transparent);
  color:var(--muted); border-radius:0 6px 6px 0; margin-top:14px;
}

/* BEST PRACTICES */
.bp-grid{display:grid; grid-template-columns:repeat(auto-fit,minmax(240px,1fr)); gap:18px;}
.bp-item{background:var(--panel); border:1px solid var(--line); border-radius:10px; padding:20px;}
.bp-item .k{font-family:var(--mono); color:var(--amber); font-size:12px; letter-spacing:1px;}
.bp-item h4{margin:8px 0 6px; font-size:15px;}
.bp-item p{color:var(--muted); font-size:14px; margin:0;}

/* PLAYGROUND */
.pg-setup{display:flex; gap:12px; flex-wrap:wrap; align-items:center; margin-bottom:18px;}
.pg-setup input[type=text]{
  background:var(--panel-2); border:1px solid var(--line); color:var(--text);
  font-family:var(--mono); padding:9px 12px; border-radius:6px; font-size:13px; min-width:220px;
}
.btn{
  font-family:var(--mono); font-size:13px; padding:10px 18px; border-radius:6px; border:1px solid var(--amber);
  background:var(--amber); color:#1a1200; font-weight:600; cursor:pointer;
}
.btn.secondary{background:transparent; color:var(--amber);}
.btn:disabled{opacity:0.4; cursor:not-allowed;}
.pg-steps{display:flex; gap:6px; margin-bottom:16px; flex-wrap:wrap;}
.pg-step-dot{
  font-family:var(--mono); font-size:11px; padding:4px 10px; border-radius:14px; border:1px solid var(--line);
  color:var(--muted);
}
.pg-step-dot.done{border-color:var(--ok); color:var(--ok);}
.pg-step-dot.current{border-color:var(--amber); color:var(--amber);}
.pg-console{
  background:color-mix(in srgb, var(--bg) 92%, black); border:1px solid var(--line); border-radius:8px;
  padding:18px; font-family:var(--mono); font-size:13px; min-height:260px; max-height:400px; overflow-y:auto;
}
.pg-console .prompt{color:var(--ok);}
.pg-console .out{color:var(--muted);}
.pg-console .info{color:var(--cipher);}
.pg-actions{display:flex; gap:10px; margin-top:16px; flex-wrap:wrap;}
.cert-box{
  margin-top:20px; padding:20px; border:1px dashed var(--ok); border-radius:10px;
  background:color-mix(in srgb, var(--ok) 8%, transparent); display:none;
}
.cert-box.show{display:block;}
.cert-form{display:flex; gap:10px; flex-wrap:wrap; align-items:center; margin-top:12px;}
.cert-form input[type=email]{
  background:var(--panel-2); border:1px solid var(--line); color:var(--text);
  font-family:var(--mono); padding:9px 12px; border-radius:6px; font-size:13px; min-width:240px;
}
.consent{display:flex; align-items:center; gap:8px; font-size:13px; color:var(--muted); width:100%;}

/* SETTINGS PANEL */
.gear-btn{
  position:fixed; bottom:24px; right:24px; z-index:100; width:52px; height:52px; border-radius:50%;
  border:1px solid var(--line); background:var(--panel); font-size:22px; cursor:pointer;
  display:flex; align-items:center; justify-content:center; box-shadow:0 10px 30px rgba(0,0,0,0.35);
}
.settings-panel{
  position:fixed; top:0; right:-360px; width:340px; height:100%; background:var(--panel); border-left:1px solid var(--line);
  z-index:101; transition:right .25s ease; padding:24px; overflow-y:auto;
}
.settings-panel.open{right:0;}
.settings-panel h3{font-family:var(--mono); font-size:15px; margin-top:0;}
.settings-group{margin-bottom:24px;}
.settings-group label{display:block; font-family:var(--mono); font-size:12px; color:var(--muted); margin-bottom:8px; letter-spacing:0.5px;}
.settings-group input[type=text]{
  width:100%; background:var(--panel-2); border:1px solid var(--line); color:var(--text);
  padding:9px 10px; border-radius:6px; font-family:var(--mono); font-size:13px;
}
.radio-row{display:flex; gap:14px; font-size:13px; margin-bottom:8px;}
.radio-row label{display:flex; align-items:center; gap:6px; color:var(--text); font-family:var(--sans); margin:0;}
.color-row{display:flex; align-items:center; gap:10px; margin-bottom:10px;}
.color-row input[type=color]{width:36px; height:28px; border:none; background:none; cursor:pointer;}
.color-row span{font-size:13px; color:var(--muted);}
.settings-close{position:absolute; top:18px; right:18px; background:none; border:none; color:var(--muted); font-size:18px; cursor:pointer;}
.overlay-backdrop{position:fixed; inset:0; background:rgba(0,0,0,0.4); z-index:99; display:none;}
.overlay-backdrop.show{display:block;}

footer{padding:40px 0; text-align:center;}
footer p{color:var(--muted); font-size:13px; font-family:var(--mono);}

@media (max-width:640px){
  .settings-panel{width:88vw; right:-88vw;}
  .settings-panel.open{right:0;}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  .caret{animation:none;}
}