/* Talking Birds · sistema visual compartido (web, diapositivas, guías)
   Fondos crema y verde tinta · acentos amarillo y verde · Rubik + JetBrains Mono */
@font-face{font-family:"Rubik";src:url("../fonts/Rubik-Variable.woff2") format("woff2");font-weight:300 900;font-display:swap}
@font-face{font-family:"JetBrains Mono";src:url("../fonts/JetBrainsMono-Variable.woff2") format("woff2");font-weight:100 800;font-display:swap}
:root{
  --paper:#F4F2E9;--paper-2:#ECEADF;--card:#FBFAF5;--ink:#151B17;--ink-2:#1F2822;--ink-3:#2C372F;
  --green:#90B641;--green-text:#4F6E18;--green-soft:#DCEBB8;--yellow:#F2CB42;--yellow-soft:#FFF3C4;
  --muted:#5C6A5E;--muted-d:#A9B4A6;--red:#A23B26;--red-soft:#F7E1DA;--ok:#2F6B1A;--ok-soft:#E3F0CF;
  --rule:rgba(21,27,23,.13);--rule-d:rgba(244,242,233,.14);
  --sans:"Rubik",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,"SF Mono",Consolas,monospace;
  --wrap:1160px;--gut:max(16px,env(safe-area-inset-left,0px));--gut-r:max(16px,env(safe-area-inset-right,0px));
  --hdr:72px;color-scheme:light;
}
@media(min-width:760px){:root{--gut:max(40px,env(safe-area-inset-left,0px));--gut-r:max(40px,env(safe-area-inset-right,0px))}}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--hdr) + 16px);-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:400 17px/1.65 var(--sans);-webkit-font-smoothing:antialiased;font-kerning:normal}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:60;background:var(--paper)}
h1,h2,h3,h4,p{margin:0}
h1,h2{font-weight:600;letter-spacing:-.025em;text-wrap:balance;line-height:1.04}
h3{font-weight:600;letter-spacing:-.01em;line-height:1.22;text-wrap:balance}
a{color:inherit}
img,video{max-width:100%;display:block}
svg{display:block}
code,kbd{font-family:var(--mono);font-size:.88em}
code{background:var(--paper-2);padding:.1em .4em;border-radius:6px}
kbd{border:1px solid var(--rule);border-bottom-width:2px;border-radius:6px;padding:.05em .45em;background:var(--card)}
::selection{background:var(--yellow);color:var(--ink)}
:focus-visible{outline:3px solid var(--yellow);outline-offset:3px;border-radius:6px}
.wrap{max-width:calc(var(--wrap) + var(--gut) + var(--gut-r));margin:0 auto;padding-left:var(--gut);padding-right:var(--gut-r)}
.lab{font:500 12px/16px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-feature-settings:"case" 1}
.lab-g{color:var(--green-text)}
.dark .lab{color:var(--muted-d)} .dark .lab-g{color:var(--green)}
.kicker{display:inline-flex;align-items:center;gap:12px}
.kicker::before{content:"";width:10px;height:10px;border-radius:50%;background:var(--yellow);flex:none}
.band{padding-block:clamp(64px,9vw,120px)}
.band-s{padding-block:clamp(48px,6vw,80px)}
.dark{background:var(--ink);color:var(--paper)}
.alt{background:var(--paper-2)}
.h1{font-size:clamp(42px,6vw,84px);letter-spacing:-.032em;line-height:1}
.h2{font-size:clamp(32px,4.4vw,56px)}
.h3{font-size:clamp(22px,2.2vw,28px)}
.lead{font-size:clamp(18px,1.7vw,21px);line-height:1.55;color:var(--muted);max-width:60ch}
.dark .lead{color:var(--muted-d)}
.prose p{max-width:66ch}
.prose p+p{margin-top:14px}
.muted{color:var(--muted)} .dark .muted{color:var(--muted-d)}
.small{font-size:15px;line-height:1.6}
.sec-head{display:grid;gap:18px;max-width:820px;margin-bottom:clamp(36px,5vw,60px)}
.stack{display:grid;gap:16px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:12px;padding:15px 22px;border-radius:999px;font:600 15px/1 var(--sans);text-decoration:none;border:1.5px solid transparent;transition:transform .18s ease,background .18s ease,border-color .18s ease;cursor:pointer;color:inherit;background:none}
.btn:hover{transform:translateY(-2px)}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none}
.btn-y{background:var(--yellow);color:var(--ink)} .btn-y:hover{background:#F6D663}
.btn-g{background:var(--green);color:var(--ink)} .btn-g:hover{background:#A2C657}
.btn-line{border-color:rgba(244,242,233,.35);color:var(--paper)} .btn-line:hover{border-color:var(--paper)}
.btn-ink{background:var(--ink);color:var(--paper)} .btn-ink:hover{background:var(--ink-3)}
.btn-ghost{border-color:var(--rule);color:var(--ink);background:var(--card)} .btn-ghost:hover{border-color:var(--ink)}
.btn-s{padding:10px 16px;font-size:14px}
.btn .ar{transition:transform .18s ease} .btn:hover .ar{transform:translateX(3px)}
.btns{display:flex;flex-wrap:wrap;gap:12px}

/* header */
.hdr{position:sticky;top:env(safe-area-inset-top,0px);z-index:50;background:rgba(244,242,233,.92);backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);border-bottom:1px solid var(--rule)}
.hdr-in{height:var(--hdr);display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:block;flex:none}
.nav{display:flex;align-items:center;gap:clamp(18px,2.4vw,34px)}
.nav a{text-decoration:none;font-size:15px;font-weight:500;color:var(--muted);padding:8px 0;position:relative}
.nav a:hover,.nav a[aria-current="page"]{color:var(--ink)}
.nav a[aria-current="page"]::after{content:"";position:absolute;left:0;right:0;bottom:2px;height:2px;border-radius:2px;background:var(--green)}
.nav .nav-cta{display:none}
.menu-btn{display:none;background:none;border:0;padding:10px;margin-right:-10px;cursor:pointer;color:var(--ink)}
@media(max-width:860px){
  .nav{display:none;position:absolute;top:var(--hdr);left:0;right:0;flex-direction:column;align-items:stretch;gap:0;background:var(--paper);border-bottom:1px solid var(--rule);padding:8px var(--gut-r) 18px var(--gut);box-shadow:0 18px 30px rgba(21,27,23,.08)}
  .nav.open{display:flex}
  .nav a{padding:14px 0;font-size:17px;border-bottom:1px solid var(--rule)}
  .nav a[aria-current="page"]::after{display:none}
  .nav .nav-cta{display:block;color:var(--green-text);font-weight:600}
  .hdr-cta{display:none}
  .menu-btn{display:block}
}

/* footer */
.ftr{background:#101511;color:var(--paper);padding-block:56px 28px}
.ftr-top{display:flex;flex-wrap:wrap;justify-content:space-between;gap:32px;padding-bottom:40px;border-bottom:1px solid var(--rule-d)}
.ftr-top p{margin-top:16px;color:var(--muted-d);font-size:15px;max-width:40ch}
.ftr nav{display:grid;grid-template-columns:repeat(2,auto);gap:10px 40px;align-content:start}
.ftr nav a{color:var(--muted-d);text-decoration:none;font-size:15px} .ftr nav a:hover{color:var(--paper)}
.ftr-bot{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px 24px;padding-top:22px}
.ftr-bot .lab{color:#7F8B7D;font-size:11px}

/* LoRA screen: the robot face, framed like the Stack-chan display */
.screen{position:relative;border-radius:34px;padding:14px;background:#0E1310;box-shadow:0 40px 80px -30px rgba(0,0,0,.6),inset 0 0 0 1px rgba(255,255,255,.06)}
.screen video,.screen img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:22px;background:#4f7a28}
.screen .led{position:absolute;top:50%;width:6px;height:46px;border-radius:4px;transform:translateY(-50%);background:var(--yellow);box-shadow:0 0 14px rgba(242,203,66,.8)}
.screen .led.l{left:3px} .screen .led.r{right:3px}
.bubble{background:var(--paper);color:var(--ink);border-radius:20px 20px 20px 6px;padding:14px 18px;font-size:16px;line-height:1.45;box-shadow:0 14px 30px rgba(0,0,0,.28)}
.bubble .who{display:block;font:500 11px/14px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--green-text);margin-bottom:5px}

/* cards & tiles used with intent */
.tile{background:var(--card);border:1px solid var(--rule);border-radius:24px;padding:28px}
.dark .tile{background:var(--ink-2);border-color:var(--rule-d)}
.note{border-radius:16px;padding:16px 18px;font-size:16px;line-height:1.55}
.note-y{background:var(--yellow-soft)} .note-g{background:var(--green-soft)} .note-r{background:var(--red-soft)} .note-ink{background:var(--ink);color:var(--paper)}
.note b{font-weight:600}
.pill{display:inline-flex;align-items:center;gap:8px;border-radius:999px;padding:7px 12px;font:500 12px/1 var(--mono);letter-spacing:.06em;text-transform:uppercase;background:var(--paper-2);color:var(--ink)}
.pill-y{background:var(--yellow);} .pill-g{background:var(--green-soft)} .pill-ink{background:var(--ink);color:var(--paper)}

/* path: Entender · Probar · Decidir */
.path ol{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0}
.path li{display:grid;gap:8px;padding:24px 24px 24px 0;border-top:2px solid currentColor}
.path li+li{padding-left:24px;border-left:1px solid var(--rule)}
.dark .path li+li{border-left-color:var(--rule-d)}
.path li b{font-size:clamp(24px,2.6vw,32px);font-weight:600;letter-spacing:-.015em}
.path li .lab{color:var(--green-text)} .dark .path li .lab{color:var(--yellow)}
.path li p{font-size:16px;color:var(--muted)} .dark .path li p{color:var(--muted-d)}
@media(max-width:760px){.path ol{grid-template-columns:minmax(0,1fr)}.path li+li{padding-left:0;border-left:0}}

/* tables */
.tbl-wrap{overflow-x:auto;border:1px solid var(--rule);border-radius:18px;background:var(--card)}
table.tbl{border-collapse:collapse;width:100%;font-size:15px;line-height:1.5}
.tbl th,.tbl td{text-align:left;vertical-align:top;padding:12px 16px;border-bottom:1px solid var(--rule)}
.tbl thead th{font:500 12px/16px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);background:var(--paper-2)}
.tbl tr:last-child td{border-bottom:0}
.tbl td.num{font-variant-numeric:tabular-nums;white-space:nowrap}

/* code / prompt boxes */
.codebox{position:relative;background:var(--ink);color:#E9EEE4;border-radius:18px;overflow:hidden}
.codebox pre{margin:0;padding:20px 20px 22px;font:400 13px/1.65 var(--mono);white-space:pre-wrap;word-break:break-word;max-height:360px;overflow:auto}
.codebox .bar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 12px 10px 20px;border-bottom:1px solid var(--rule-d)}
.codebox .bar .lab{color:var(--muted-d)}
.copy{flex:none;border:0;background:var(--yellow);color:var(--ink);font:600 13px/1 var(--sans);padding:10px 14px;border-radius:999px;cursor:pointer}
.copy.done{background:var(--green)}

/* diagram helpers */
.flow{display:grid;gap:10px}
.flow-row{display:flex;flex-wrap:wrap;align-items:stretch;gap:10px}
.node{flex:1 1 150px;min-width:0;border-radius:18px;padding:16px 16px 18px;background:var(--card);border:1px solid var(--rule)}
.node .lab{display:block;margin-bottom:6px}
.node b{display:block;font-size:18px;font-weight:600;letter-spacing:-.01em;line-height:1.2}
.node span.d{display:block;font-size:14px;color:var(--muted);margin-top:4px;line-height:1.45}
.dark .node{background:var(--ink-2);border-color:var(--rule-d)} .dark .node span.d{color:var(--muted-d)}
.arrow{align-self:center;flex:none;font:500 18px/1 var(--mono);color:var(--green-text)}
.dark .arrow{color:var(--yellow)}

/* timeline */
.tl{list-style:none;margin:0;padding:0;position:relative}
.tl::before{content:"";position:absolute;left:7px;top:8px;bottom:8px;width:2px;background:linear-gradient(var(--green),var(--green) 75%,transparent)}
.tl-item{position:relative;padding:0 0 34px 44px;display:grid;gap:6px}
.tl-item:last-child{padding-bottom:0}
.tl-dot{position:absolute;left:0;top:2px;width:16px;height:16px;border-radius:50%;background:var(--paper);border:3px solid var(--green)}
.alt .tl-dot{background:var(--paper-2)}
.tl-now .tl-dot{background:var(--yellow);border-color:var(--yellow);box-shadow:0 0 0 6px rgba(242,203,66,.25)}
.tl-next .tl-dot{border-style:dashed;border-color:var(--muted)}
.tl-item h3{font-size:21px}
.tl-item p{color:var(--muted);font-size:16px;max-width:60ch}

details.more{border-top:1px solid var(--rule);padding-top:14px;margin-top:8px}
details.more summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px;font-weight:500}
details.more summary::-webkit-details-marker{display:none}
details.more summary::after{content:"+";font-size:22px;line-height:1;color:var(--green-text)}
details.more[open] summary::after{content:"–"}
details.more > div{margin-top:14px}

.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(28px,5vw,72px)}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
@media(max-width:900px){.grid-2,.grid-3{grid-template-columns:minmax(0,1fr)}}

/* motion: everything is visible at rest */
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}