/* ==========================================================================
   Base: tokens, reset, tipografia, botões, barra fixa, espinha e hero
   ========================================================================== */
:root{
  --bg:#000;
  --accent:#00D4FF;
  --accent-dim:rgba(0,212,255,.35);
  --accent-glow:rgba(0,212,255,.13);
  --white:#FFF;
  --ice:#E0E6ED;
  --muted:#8891A0;
  --line:rgba(255,255,255,.09);
  --glass-border:rgba(0,212,255,.16);
  --panel:#0B0D10;
  --panel-2:#14181E;
  --panel-line:rgba(255,255,255,.08);
  --wire:color-mix(in srgb,var(--white) 26%,var(--bg));
  --ft:'Montserrat','Helvetica Neue',Arial,sans-serif;
  --fb:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --ease:cubic-bezier(.16,1,.3,1);
  --bar:56px;
  --pad:20px;
  --gutter:var(--pad);
  --spine-x:calc(var(--pad) / 2 - 2px);
  --maxw:1320px;
  --h2:clamp(1.8rem,1.05rem + 3.1vw,3.3rem);
}
@media (min-width:600px){:root{--pad:32px}}
@media (min-width:960px){:root{--bar:64px;--pad:48px;--gutter:200px;--spine-x:48px}}

/* Reset e tema do navegador */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
[hidden]{display:none!important}
html{background:var(--bg);color-scheme:dark;scroll-behavior:smooth;-webkit-text-size-adjust:100%;
  scrollbar-width:thin;scrollbar-color:color-mix(in srgb,var(--accent) 38%,var(--bg)) var(--bg)}
body{font-family:var(--fb);font-size:1rem;line-height:1.6;color:var(--ice);background:var(--bg);-webkit-font-smoothing:antialiased}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:color-mix(in srgb,var(--accent) 38%,var(--bg));border-radius:10px;border:2px solid var(--bg)}
::selection{background:var(--accent);color:#000}
img,svg{display:block;max-width:100%}
a{color:inherit;text-underline-offset:.24em;text-decoration-thickness:1px}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{list-style:none}
fieldset{border:0;min-width:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:3px}
kbd{font-family:var(--fb)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip{position:fixed;left:16px;top:-80px;z-index:100;padding:10px 16px;border-radius:6px;background:var(--accent);color:#000;font-weight:600;text-decoration:none}
.skip:focus{top:12px}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition-duration:.01ms!important;transition-delay:0s!important}
}

/* Tipografia */
h1,h2,h3{font-family:var(--ft);font-weight:800;color:var(--white);text-transform:uppercase;letter-spacing:.012em;text-wrap:balance}
h2{font-size:var(--h2);line-height:1.06}
h3{font-size:clamp(1.2rem,.98rem + .9vw,1.6rem);line-height:1.15;letter-spacing:.02em}
p{text-wrap:pretty}
.accent{color:var(--accent)}
.lead{max-width:56ch;margin-top:20px;font-size:clamp(1.02rem,.97rem + .25vw,1.15rem);color:var(--muted)}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--pad)}

/* Ícones e selos */
.i{width:24px;height:24px;flex-shrink:0;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.selo{display:inline-flex;align-items:center;height:24px;padding:0 11px;border:1px solid var(--glass-border);border-radius:999px;background:var(--bg);
  font-family:var(--ft);font-weight:700;font-size:.69rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);white-space:nowrap}

/* Botões e links */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:0 26px;border-radius:6px;background:var(--accent);color:#000;
  font-family:var(--ft);font-weight:700;font-size:.8rem;letter-spacing:.1em;text-transform:uppercase;text-decoration:none;white-space:nowrap;
  transition:transform 160ms var(--ease),background-color 200ms ease,box-shadow 240ms ease}
.btn:active{transform:scale(.97)}
@media (hover:hover) and (pointer:fine){
  .btn:hover{background:color-mix(in srgb,var(--accent) 80%,var(--white));box-shadow:0 12px 32px -14px var(--accent)}
}
.btn-sm{min-height:38px;padding:0 16px;font-size:.69rem;letter-spacing:.08em}
.btn-lg{min-height:64px;padding:0 clamp(20px,4vw,40px);font-size:clamp(.78rem,.7rem + .4vw,.92rem)}
@media (max-width:479px){.btn-lg{width:100%}}
.link-arrow{display:inline-flex;align-items:center;gap:10px;padding:12px 2px;font-weight:600;color:var(--white);text-decoration:none}
.link-arrow .i{width:18px;height:18px;color:var(--accent);transition:transform 200ms var(--ease)}
@media (hover:hover) and (pointer:fine){.link-arrow:hover .i{transform:translateX(4px)}.link-arrow:hover{text-decoration:underline}}
.link-btn{display:inline-flex;align-items:center;gap:8px;padding:8px 0;font-size:.86rem;color:var(--muted);text-decoration:underline;text-underline-offset:.28em}
.link-btn .i{width:16px;height:16px}
@media (hover:hover){.link-btn:hover{color:var(--white)}}

/* Barra fixa */
.bar{position:fixed;inset:0 0 auto;z-index:50;height:var(--bar);background:rgba(0,0,0,.86);border-bottom:1px solid transparent;transition:border-color 240ms ease}
.bar.is-scrolled{border-bottom-color:var(--line)}
.bar-in{display:flex;align-items:center;gap:20px;height:100%;max-width:var(--maxw);margin:0 auto;padding:0 var(--pad)}
.bar-logo{flex-shrink:0;padding:6px 0}
.bar-logo img{height:18px;width:auto}
.bar-mid,.bar-hint,.lg-only{display:none}
.bar .btn{margin-left:auto}
@media (min-width:960px){
  .bar-logo img{height:22px}
  .lg-only{display:inline}
  .sm-only{display:none}
  .bar-mid{display:flex;align-items:center;gap:14px;margin:0 auto;font-family:var(--ft);font-weight:700;font-size:.69rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);white-space:nowrap}
  .bar-chapter{display:flex;align-items:center;gap:14px;color:var(--white)}
  .bar-chapter:not(:empty)::before{content:'';width:20px;height:1px;background:var(--accent)}
  .bar .btn{margin-left:0}
}
@media (min-width:1180px){
  .bar-hint{display:flex;align-items:center;gap:6px;font-size:.74rem;color:var(--muted);white-space:nowrap}
  .bar-hint kbd{display:inline-grid;place-items:center;min-width:22px;height:22px;border:1px solid var(--line);border-radius:5px;font-size:.72rem;color:var(--ice)}
  .bar-hint kbd + kbd{margin-right:4px}
}

/* Espinha: linha da página, luz e nós (no celular, linha fina na margem sem rótulos) */
.chapters{position:relative}
.spine{position:absolute;top:0;bottom:0;width:1px;left:calc(max(0px,(100% - var(--maxw)) / 2) + var(--spine-x));background:rgba(255,255,255,.14);pointer-events:none}
.spine i{position:absolute;left:0;top:0}
.spine-fill{width:1px;height:100%;background:linear-gradient(to bottom,rgba(0,212,255,.6),var(--accent));transform-origin:50% 0;transform:scaleY(0)}
.spine-light{width:7px;height:7px;margin:-3.5px 0 0 -3px;border-radius:50%;background:var(--white);opacity:0;transition:opacity 300ms ease;
  box-shadow:0 0 0 2px var(--accent),0 0 18px 4px var(--accent-dim)}
.spine.is-on .spine-light{opacity:1}
html:not(.js) .spine i{display:none}
.node{position:absolute;z-index:2;left:calc(var(--spine-x) - var(--gutter) - 3px);top:calc(var(--h2) * .53 - 3.5px);display:flex;align-items:center;gap:14px;
  font-family:var(--ft);font-weight:700;font-size:.69rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);text-decoration:none;white-space:nowrap;transition:color 240ms ease}
.node::before{content:'';width:7px;height:7px;flex-shrink:0;border-radius:50%;border:1px solid rgba(255,255,255,.4);background:var(--bg);
  transition:background-color 240ms ease,border-color 240ms ease,transform 240ms var(--ease),box-shadow 240ms ease}
.node span{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
.node.is-passed::before{background:var(--accent);border-color:var(--accent)}
.node.is-current{color:var(--white)}
.node.is-current::before{transform:scale(1.4);box-shadow:0 0 0 3px var(--accent-glow),0 0 14px var(--accent-dim)}
@media (min-width:960px){
  .node{left:calc(var(--spine-x) - var(--gutter) - 4px);top:calc(var(--h2) * .53 - 9px);min-height:18px}
  .node::before{width:9px;height:9px;border-color:rgba(255,255,255,.32)}
  .node span{position:static;width:auto;height:auto;overflow:visible;clip:auto}
  .node.is-current::before{transform:scale(1.5)}
  .node:hover{color:var(--ice)}
}

/* Revelação na rolagem (só com JS) */
html.js .reveal-b{opacity:0;transform:translateY(20px) scale(.985);transform-origin:50% 0;transition:opacity 700ms var(--ease),transform 700ms var(--ease)}
html.js .is-in{opacity:1;transform:none}

/* Hero */
.hero{display:flex;flex-direction:column;justify-content:center;min-height:100svh;padding:calc(var(--bar) + clamp(32px,7vh,88px)) 0 clamp(32px,5vh,56px)}
.hero h1{font-size:clamp(2.05rem,10.4vw,3.6rem);line-height:1.02;letter-spacing:.005em}
.h1-line{display:block}
.hero-row{display:flex;flex-direction:column;gap:24px;margin-top:clamp(20px,3.4vh,36px)}
.hero-text{max-width:60ch;font-size:clamp(1rem,.95rem + .3vw,1.14rem);color:var(--muted)}
.hero-ctas{display:flex;flex-wrap:wrap;align-items:center;gap:12px 28px}
@media (min-width:960px){
  .hero h1{font-size:min(5rem,(100vw - 96px) / 15.4)}
  .hero-row{flex-direction:row;align-items:flex-end;justify-content:space-between;gap:56px}
  .hero-ctas{flex-shrink:0;padding-bottom:4px}
}
@keyframes rise{from{opacity:0;transform:translateY(14px)}}
html.js .hero .h1-line,html.js .hero-row,html.js .system{animation:rise 900ms var(--ease) both}
html.js .hero .h1-line + .h1-line{animation-delay:90ms}
html.js .hero-row{animation-delay:200ms}
html.js .system{animation-delay:340ms}

/* Linha do sistema: 5 estações num laço */
.system{margin-top:clamp(40px,8vh,96px)}
.system-track{--ic:36px;position:relative;padding-bottom:14px}
.system-loop{position:absolute;left:0;right:0;top:calc(var(--ic) / 2);bottom:0;border:1px dashed rgba(255,255,255,.18);border-radius:999px;pointer-events:none}
.system-wire{position:absolute;left:10%;right:10%;top:calc(var(--ic) / 2);height:1px;background:var(--wire)}
.spark,.trail{position:absolute;left:0;top:0;border-radius:50%;opacity:0;pointer-events:none}
.spark{width:7px;height:7px;margin:-3.5px 0 0 -3.5px;background:var(--white);box-shadow:0 0 0 2px var(--accent),0 0 16px 4px var(--accent-dim);transition:opacity 400ms ease}
.trail{width:4px;height:4px;margin:-2px 0 0 -2px;background:var(--accent)}
.system.is-running .spark{opacity:1}
.system:not(.is-running) .trail{visibility:hidden}
.stations{position:relative;z-index:1;display:grid;grid-template-columns:repeat(5,minmax(0,1fr))}
.station{display:flex;flex-direction:column;align-items:center;text-align:center}
.st-icon{display:grid;place-items:center;width:var(--ic);height:var(--ic);border-radius:50%;border:1px solid rgba(255,255,255,.22);background:var(--bg);color:var(--muted);
  transition:color 1.4s ease,border-color 1.4s ease,background-color 1.4s ease}
.st-icon .i{width:20px;height:20px}
.st-name{margin-top:8px;font-size:.69rem;font-weight:600;line-height:1.3;color:var(--muted);white-space:nowrap;transition:color 1.4s ease}
.st-sub{display:none}
.station.is-lit .st-icon,.system.is-static .st-icon,html:not(.js) .st-icon{color:var(--accent);border-color:var(--accent);background-color:#00161B;transition-duration:150ms}
.station.is-lit .st-name,.system.is-static .st-name,html:not(.js) .st-name{color:var(--white);transition-duration:150ms}
.system figcaption{margin-top:14px;font-size:.8rem;color:var(--muted);text-align:center}
@media (max-width:419px){
  .stations{grid-template-columns:1fr 1fr 1.3fr 1fr 1fr}
  .system-wire{left:calc(50% / 5.3);right:calc(50% / 5.3)}
}
@media (min-width:400px){.st-name{font-size:.72rem}}
@media (min-width:640px){
  .system-track{--ic:52px;padding-bottom:24px}
  .st-icon .i{width:24px;height:24px}
  .st-name{margin-top:16px;font-family:var(--ft);font-weight:700;font-size:.72rem;letter-spacing:.12em;text-transform:uppercase}
  .st-sub{display:block;margin-top:4px;padding:0 6px;font-size:.84rem;line-height:1.35;color:var(--muted)}
  .system figcaption{margin-top:18px;font-size:.86rem}
}