/* OptemEra homepage — October 2026 */
:root{
  color-scheme:light;
  --bg:#f5f6f2;--surface:#fff;--surface-2:#eef1ec;--ink:#12201b;--muted:#5a6a63;--faint:#616f68;
  --line:#dde3dc;--line-strong:#c9d2ca;--brand:#0d7a5c;--brand-ink:#fff;--focus:#0d7a5c;
  --shadow:0 1px 2px rgba(18,32,27,.05),0 8px 24px rgba(18,32,27,.06);
  --shadow-hover:0 2px 4px rgba(18,32,27,.06),0 18px 40px rgba(18,32,27,.12);
  --fuel:#0b7d68;--iberia:#9a5b00;--fire:#c23d17;--radar:#1d64c4;--sudoku:#6845c4;--api:#0d7a5c;
  --radius:22px;--wrap:1160px;--gutter:clamp(16px,4vw,32px);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI Variable","Segoe UI",Inter,Roboto,"Helvetica Neue",Arial,sans-serif;
}
:root[data-home-theme=dark]{
  color-scheme:dark;
  --bg:#0c1210;--surface:#141c19;--surface-2:#1b2521;--ink:#e9efec;--muted:#a3b2ab;--faint:#8b9993;
  --line:#25312c;--line-strong:#33423b;--brand:#4fd1a1;--brand-ink:#06231a;--focus:#4fd1a1;
  --shadow:0 1px 2px rgba(0,0,0,.3);--shadow-hover:0 18px 40px rgba(0,0,0,.45);
  --fuel:#3fd0b3;--iberia:#f2b13a;--fire:#ff7a52;--radar:#6aa8ff;--sudoku:#a78bfa;--api:#4fd1a1;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.55;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{display:block;max-width:100%}
a{color:inherit}
a:focus-visible,button:focus-visible{outline:2px solid var(--focus);outline-offset:3px;border-radius:8px}
.wrap{width:min(var(--wrap),100% - 2*var(--gutter));margin-inline:auto}
.skip{position:absolute;left:-9999px;top:8px;z-index:200;background:var(--ink);color:var(--bg);padding:10px 14px;border-radius:10px;text-decoration:none}
.skip:focus{left:8px}

/* Header */
.site-header{position:sticky;top:0;z-index:100;background:color-mix(in srgb,var(--bg) 86%,transparent);backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:24px;min-height:64px}
.brand{font-size:21px;font-weight:800;letter-spacing:-.04em;text-decoration:none;color:var(--ink);white-space:nowrap}
.brand span{color:var(--brand)}
.main-nav{display:flex;gap:4px;margin-left:auto;overflow-x:auto;scrollbar-width:none}
.main-nav::-webkit-scrollbar{display:none}
.main-nav a{padding:8px 11px;border-radius:999px;color:var(--muted);font-size:14px;font-weight:600;text-decoration:none;white-space:nowrap;transition:background .15s,color .15s}
.main-nav a:hover{background:var(--surface-2);color:var(--ink)}
.controls{display:flex;align-items:center;gap:8px}
.icon-btn{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:999px;border:1px solid var(--line-strong);background:var(--surface);color:var(--ink);cursor:pointer;padding:0}
.icon-btn svg{width:18px;height:18px}
.icon-btn .moon{display:none}
:root[data-home-theme=dark] .icon-btn .sun{display:none}
:root[data-home-theme=dark] .icon-btn .moon{display:block}
.lang{display:inline-flex;padding:3px;border:1px solid var(--line-strong);border-radius:999px;background:var(--surface)}
.lang button{border:0;background:transparent;color:var(--muted);font:600 12px/1 var(--font);letter-spacing:.04em;padding:9px 10px;border-radius:999px;cursor:pointer}
.lang button[aria-pressed=true]{background:var(--ink);color:var(--bg)}

/* Hero */
.hero{padding:clamp(48px,9vw,104px) 0 clamp(36px,6vw,64px)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;margin:0 0 20px;padding:6px 12px 6px 10px;border:1px solid var(--line-strong);border-radius:999px;background:var(--surface);color:var(--muted);font-size:13px;font-weight:600}
.eyebrow::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--brand);box-shadow:0 0 0 4px color-mix(in srgb,var(--brand) 18%,transparent)}
.hero h1{margin:0;max-width:15ch;font-size:clamp(42px,7.2vw,88px);line-height:1;letter-spacing:-.045em;font-weight:800}
.hero h1 em{font-style:normal;color:var(--brand)}
.lede{margin:24px 0 0;max-width:58ch;color:var(--muted);font-size:clamp(17px,1.9vw,20px);line-height:1.6}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.btn{display:inline-flex;align-items:center;gap:10px;min-height:48px;padding:0 20px;border-radius:999px;font-size:15px;font-weight:700;text-decoration:none;border:1px solid transparent;transition:transform .15s,background .15s,border-color .15s}
.btn svg{width:16px;height:16px;transition:transform .15s}
.btn:hover svg{transform:translateX(2px)}
.btn-primary{background:var(--brand);color:var(--brand-ink)}
.btn-primary:hover{transform:translateY(-1px)}
.btn-ghost{border-color:var(--line-strong);color:var(--ink);background:var(--surface)}
.btn-ghost:hover{border-color:var(--ink)}
.facts{display:flex;flex-wrap:wrap;gap:10px 28px;margin:40px 0 0;padding:0;list-style:none;color:var(--muted);font-size:14px}
.facts li{display:flex;align-items:center;gap:8px}
.facts svg{width:16px;height:16px;color:var(--brand);flex:none}

/* Section heading */
.section{padding:clamp(24px,4vw,40px) 0 clamp(48px,7vw,88px)}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:24px}
.section-head h2{margin:0;font-size:clamp(26px,3.4vw,36px);letter-spacing:-.03em;line-height:1.15}
.section-head p{margin:0;color:var(--muted);max-width:44ch}

/* Tool cards */
.tools{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:20px}
.card{--accent:var(--brand);position:relative;display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);text-decoration:none;color:var(--ink);overflow:hidden;transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:color-mix(in srgb,var(--accent) 45%,var(--line))}
.card.fuel{--accent:var(--fuel)}.card.iberia{--accent:var(--iberia)}.card.fire{--accent:var(--fire)}.card.radar{--accent:var(--radar)}.card.sudoku{--accent:var(--sudoku)}.card.api{--accent:var(--api)}
.span-12{grid-column:1/-1}.card.s2{--accent:var(--brand)}.span-7{grid-column:span 7}.span-5{grid-column:span 5}.span-4{grid-column:span 4}.span-8{grid-column:span 8}
.shot{position:relative;margin:10px 10px 0;border-radius:calc(var(--radius) - 8px);overflow:hidden;background:var(--surface-2);aspect-ratio:16/9}
.span-5 .shot{aspect-ratio:4/3}
.shot img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
.card:hover .shot img{transform:scale(1.03)}
.shot::after{content:"";position:absolute;inset:0;border-radius:inherit;box-shadow:inset 0 0 0 1px rgba(0,0,0,.06);pointer-events:none}
:root[data-home-theme=dark] .shot img{filter:brightness(.86) saturate(.95)}
.badge{position:absolute;left:12px;top:12px;display:inline-flex;align-items:center;gap:6px;padding:5px 10px;border-radius:999px;background:rgba(255,255,255,.92);color:#12201b;font-size:12px;font-weight:700;box-shadow:0 2px 8px rgba(0,0,0,.12)}
.badge::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--accent)}
.card-body{display:flex;flex-direction:column;gap:10px;flex:1;padding:20px 22px 22px}
.card-title{display:flex;align-items:center;gap:12px}
.card-title img,.card-title .app-icon{width:40px;height:40px;border-radius:11px;flex:none}
.card h3{margin:0;font-size:22px;letter-spacing:-.025em;line-height:1.2}
.card p{margin:0;color:var(--muted);font-size:15px;line-height:1.6}
.card-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:auto;padding-top:8px;font-size:14px}
.source{color:var(--faint);font-size:13px}
.go{display:inline-flex;align-items:center;gap:6px;color:var(--accent);font-weight:700;white-space:nowrap}
.go svg{width:16px;height:16px;transition:transform .15s}
.card:hover .go svg{transform:translateX(3px)}

/* Sudoku mini board */
.board{display:grid;place-items:center;margin:10px 10px 0;border-radius:calc(var(--radius) - 8px);background:color-mix(in srgb,var(--sudoku) 10%,var(--surface-2));aspect-ratio:16/9}
.grid9{display:grid;grid-template-columns:repeat(3,1fr);width:min(52%,150px);aspect-ratio:1;border:2px solid var(--ink);border-radius:8px;overflow:hidden;background:var(--surface)}
.grid9 span{display:grid;place-items:center;border-right:1px solid var(--line-strong);border-bottom:1px solid var(--line-strong);font-weight:700;font-size:clamp(16px,2vw,22px);color:var(--ink)}
.grid9 span:nth-child(3n){border-right:0}.grid9 span:nth-child(n+7){border-bottom:0}
.grid9 span.hint{color:var(--sudoku)}

/* API card */
.card.api{flex-direction:row;align-items:stretch;background:var(--ink);color:var(--bg);border-color:var(--ink)}
.card.api .card-body{padding:clamp(22px,3vw,34px);gap:14px}
.card.api h3{font-size:clamp(24px,2.6vw,30px)}
.card.api p{color:color-mix(in srgb,var(--bg) 72%,transparent)}
.card.api .go{color:var(--bg)}
.steps{flex:none;width:min(44%,340px);margin:10px;padding:22px;border-radius:calc(var(--radius) - 8px);background:color-mix(in srgb,var(--bg) 9%,var(--ink));list-style:none;counter-reset:step;display:flex;flex-direction:column;justify-content:center;gap:16px}
.steps li{counter-increment:step;display:flex;gap:12px;align-items:baseline;color:color-mix(in srgb,var(--bg) 85%,transparent);font-size:15px}
.steps li::before{content:counter(step);flex:none;display:grid;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--api);color:var(--ink);font-size:13px;font-weight:800;transform:translateY(-1px)}
.api-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:auto;padding-top:6px}
.api-actions a{display:inline-flex;align-items:center;gap:8px;min-height:42px;padding:0 16px;border-radius:999px;font-size:14px;font-weight:700;text-decoration:none}
.api-actions a.primary{background:var(--bg);color:var(--ink)}
.api-actions a.secondary{border:1px solid color-mix(in srgb,var(--bg) 30%,transparent);color:var(--bg)}
.api-actions a:hover{transform:translateY(-1px)}

/* Principles */
.principles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin:0;padding:0;list-style:none}
.principles li{padding:22px 0 0;border-top:2px solid var(--ink)}
.principles h3{margin:0 0 8px;font-size:18px;letter-spacing:-.015em}
.principles p{margin:0;color:var(--muted);font-size:15px}

/* Footer */
.site-footer{border-top:1px solid var(--line);padding:40px 0 48px;color:var(--muted);font-size:14px}
.footer-grid{display:flex;flex-wrap:wrap;justify-content:space-between;gap:24px}
.footer-brand p{margin:8px 0 0;max-width:42ch}
.footer-links{display:flex;flex-wrap:wrap;gap:8px 22px;align-items:flex-start;margin:0;padding:0;list-style:none}
.footer-links a,.footer-links button{color:var(--ink);text-decoration:none;font:inherit;font-weight:600;background:none;border:0;padding:0;cursor:pointer}
.footer-links a:hover,.footer-links button:hover{text-decoration:underline;text-underline-offset:3px}
.fineprint{margin-top:28px;font-size:12px;color:var(--faint)}
.fineprint a{color:inherit}

/* Responsive */
@media (max-width:960px){
  .span-7,.span-5{grid-column:span 6}.span-4{grid-column:span 5}.span-8{grid-column:span 7}.span-12{grid-column:1/-1}
  .span-5 .shot{aspect-ratio:16/9}
  .card.api{flex-direction:column}.steps{width:auto;margin:0 10px 10px}
}
@media (max-width:760px){
  .header-inner{flex-wrap:wrap;gap:0 12px;min-height:0;padding:10px 0 0}
  .controls{margin-left:auto}
  .main-nav{order:3;flex-basis:100%;margin:6px calc(-1*var(--gutter)) 0;padding:0 calc(var(--gutter) - 11px) 8px}
  .tools{grid-template-columns:1fr;gap:16px}
  .span-7,.span-5,.span-4,.span-8{grid-column:auto}
  .section-head{display:block}.section-head p{margin-top:8px}
  .principles{grid-template-columns:1fr;gap:0}
  .principles li{padding:20px 0}
  .card-body{padding:18px 18px 20px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .card,.card .shot img,.btn,.btn svg,.go svg{transition:none}
  .card:hover,.btn-primary:hover{transform:none}.card:hover .shot img{transform:none}
}