/* =============================================================
   BSAI · Arquetipo 05 (gradiente que sigue al mouse), adaptado
   a la identidad plateada: monocromo + blanco como acento.
   ============================================================= */

/* 1. Tokens */
:root {
  --bg:      #0B0D12;
  --bg-2:    #11141B;
  --bg-3:    #171B24;
  --line:    #242A36;
  --ink:     #F5F7FA;
  --mute:    #A3ABBA;
  --silver-1:#E6E9EF;
  --silver-2:#9AA3B2;
  --accent:  #FFFFFF;
  --g1: rgba(154,163,178,.30);
  --g2: rgba(70,96,150,.28);
  --g3: rgba(230,233,239,.10);
  --display: "Chakra Petch", "Arial Narrow", Arial, sans-serif;
  --sans: "Inter", "Segoe UI", Roboto, Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
  --cut: 12px;
  --gutter: max(20px, env(safe-area-inset-left, 0px));
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  color-scheme: dark;
}

/* 2. Reset & base */
*, *::before, *::after { box-sizing: border-box; margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  background: var(--bg); color: var(--ink);
  font-family: var(--sans); font-size: 17px; line-height: 1.6;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
  overflow-x: clip;
}
img, svg { display: block; max-width: 100%; }
img { height: auto; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
a { color: inherit; text-decoration: none; }
p { text-wrap: pretty; }
h1, h2, h3 { font-family: var(--display); font-weight: 700; line-height: 1.04; letter-spacing: -0.01em; text-wrap: balance; }
ul, ol { padding: 0; }
::selection { background: var(--ink); color: var(--bg); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }
.skip-link { position: fixed; top: -100px; left: 1rem; padding: .6rem 1rem; background: var(--ink); color: var(--bg); z-index: 9999; font-weight: 600; }
.skip-link:focus { top: 1rem; }

/* 3. Utilities */
.wrap {
  width: 100%; max-width: 1180px; margin: 0 auto;
  padding-left: max(20px, env(safe-area-inset-left, 0px));
  padding-right: max(20px, env(safe-area-inset-right, 0px));
}
.label {
  font-family: var(--mono); font-size: .74rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--mute); display: inline-flex; align-items: center; gap: 10px;
}
.dia { width: 8px; height: 8px; background: var(--accent); transform: rotate(45deg); flex: none; }
.lead { color: var(--mute); font-size: 1.08rem; max-width: 60ch; }
.silver {
  background: linear-gradient(90deg, var(--silver-1), var(--silver-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.cut { clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut)); }

/* 5. Components */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  font-family: var(--display); font-weight: 600; font-size: 1rem; letter-spacing: .04em; text-transform: uppercase;
  padding: 15px 26px; transition: transform .35s var(--ease-out), background .25s, color .25s;
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}
.btn:hover { transform: translateY(-2px); }
.btn-solid { background: var(--ink); color: var(--bg); }
.btn-solid:hover { background: var(--silver-1); }
.btn-line { background: var(--bg-3); color: var(--ink); }
.btn-line:hover { background: #222836; }
.btn-sm { padding: 10px 18px; font-size: .85rem; --cut: 8px; }

/* Nav */
.nav {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 50;
  background: rgba(11,13,18,.82); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); background: var(--bg); z-index: 60; }
.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding-block: 12px; }
.nav-logo .logo-svg { height: 30px; width: auto; }
.nav-links { display: none; gap: 28px; font-size: .92rem; color: var(--mute); }
.nav-links a { position: relative; transition: color .2s; }
.nav-links a:hover { color: var(--ink); }

/* 6. Sections */
section { position: relative; }
.hero { min-height: min(92vh, 860px); display: flex; align-items: center; overflow: hidden; isolation: isolate; }
.hero-gradient {
  position: absolute; inset: -10%; z-index: -2;
  background:
    radial-gradient(circle 520px at var(--mx, 70%) var(--my, 35%), var(--g1) 0%, transparent 60%),
    radial-gradient(circle 700px at calc(var(--mx, 70%) - 25%) calc(var(--my, 35%) + 30%), var(--g2) 0%, transparent 60%),
    radial-gradient(circle 420px at 15% 20%, var(--g3) 0%, transparent 70%);
  filter: blur(30px);
  transition: background-position .3s;
}
.hero-grid {
  position: absolute; inset: 0; z-index: -1; opacity: .35;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse at 50% 40%, #000 20%, transparent 75%);
  mask-image: radial-gradient(ellipse at 50% 40%, #000 20%, transparent 75%);
}
.hero-inner { display: flex; flex-direction: column; gap: 26px; padding-block: 72px 96px; }
.hero-title { font-size: clamp(2.5rem, 6.2vw, 5.2rem); font-weight: 700; max-width: 18ch; }
.hero-sub { font-size: clamp(1.05rem, 1.6vw, 1.25rem); color: var(--mute); max-width: 58ch; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-mark { position: absolute; right: -6%; bottom: 6%; width: min(56vw, 640px); opacity: .05; z-index: -1; pointer-events: none; }

.manifesto { border-block: 1px solid var(--line); background: var(--bg-2); }
.manifesto .wrap { padding-block: 80px; }
.manifesto-text { font-family: var(--display); font-weight: 500; font-size: clamp(1.4rem, 3vw, 2.2rem); line-height: 1.3; max-width: 34ch; color: var(--mute); }
.manifesto-text strong { color: var(--ink); font-weight: 700; }

.block .wrap { padding-block: 96px; display: flex; flex-direction: column; gap: 44px; }
.block-alt { background: var(--bg-2); border-block: 1px solid var(--line); }
.sec-head { display: flex; flex-direction: column; gap: 16px; max-width: 780px; }
.sec-head h2, .story h2, .me h2, .contact h2 { font-size: clamp(2rem, 4.6vw, 3.4rem); }

.pains { list-style: none; display: grid; grid-template-columns: 1fr; border-top: 1px solid var(--line); }
.pains li { padding: 22px 0 22px 30px; border-bottom: 1px solid var(--line); position: relative; font-size: 1.08rem; }
.pains li::before { content: ""; position: absolute; left: 4px; top: 31px; width: 9px; height: 9px; border: 2px solid var(--silver-2); transform: rotate(45deg); }

.rows { border-top: 1px solid var(--line); }
.row { border-bottom: 1px solid var(--line); }
.row summary {
  list-style: none; cursor: pointer; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 22px;
  padding: 26px 4px; transition: padding .35s var(--ease-out);
}
.row summary::-webkit-details-marker { display: none; }
.row-n { font-family: var(--mono); font-size: .8rem; color: var(--mute); }
.row-t { font-family: var(--display); font-weight: 600; font-size: clamp(1.4rem, 3.4vw, 2.4rem); line-height: 1.1; transition: transform .35s var(--ease-out); }
.row summary:hover .row-t { transform: translateX(8px); }
.row-x { width: 16px; height: 16px; position: relative; }
.row-x::before, .row-x::after { content: ""; position: absolute; inset: 7px 0 auto; height: 2px; background: var(--ink); transition: transform .35s var(--ease-out); }
.row-x::after { transform: rotate(90deg); }
.row[open] .row-x::after { transform: rotate(0deg); }
.row ul { list-style: none; display: grid; gap: 10px; padding: 0 4px 28px calc(4px + 2.6rem); color: var(--mute); }
.row li { position: relative; padding-left: 20px; }
.row li::before { content: ""; position: absolute; left: 0; top: .62em; width: 7px; height: 7px; background: var(--silver-2); transform: rotate(45deg); }
.note { color: var(--mute); max-width: 62ch; }
.note strong { color: var(--ink); }

.story { display: grid; grid-template-columns: 1fr; gap: 48px; }
.story-text { display: flex; flex-direction: column; gap: 18px; }
.story-text p:not(.label) { color: var(--mute); max-width: 58ch; }
.story-text p strong { color: var(--ink); }
.chain { list-style: none; border-left: 2px solid var(--line); display: flex; flex-direction: column; align-self: center; }
.chain li { position: relative; padding: 0 0 26px 28px; }
.chain li:last-child { padding-bottom: 0; }
.chain li::before { content: ""; position: absolute; left: -8px; top: 6px; width: 12px; height: 12px; border: 2px solid var(--silver-2); background: var(--bg); transform: rotate(45deg); }
.chain li.bad::before { background: var(--accent); border-color: var(--accent); }
.chain-tag { display: block; font-family: var(--mono); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--mute); }
.chain li.bad .chain-tag { color: var(--ink); }

.steps { display: grid; grid-template-columns: 1fr; gap: 16px; }
.step {
  background: var(--bg-3); padding: 30px; display: flex; flex-direction: column; gap: 14px;
  clip-path: polygon(16px 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%, 0 16px);
  transition: background .3s;
}
.step:hover { background: #1C212C; }
.step-n { font-family: var(--display); font-weight: 700; font-size: 2.8rem; line-height: 1; }
.step h3 { font-size: 1.5rem; }
.step p { color: var(--mute); }
.tag { align-self: flex-start; font-family: var(--mono); font-size: .76rem; padding: 6px 10px; border: 1px solid var(--line); color: var(--ink); }

.facts { display: grid; grid-template-columns: 1fr; gap: 0; border-top: 1px solid var(--line); }
.fact { display: grid; grid-template-columns: auto auto 1fr; align-items: baseline; gap: 6px 10px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.fact-n { font-family: var(--display); font-weight: 700; font-size: clamp(2.6rem, 6vw, 4rem); line-height: 1; }
.fact-u { font-family: var(--display); font-weight: 600; font-size: 1.3rem; color: var(--mute); }
.fact p { color: var(--mute); grid-column: 1 / -1; max-width: 40ch; }

.deliv { display: grid !important; grid-template-columns: 1fr; gap: 40px; align-items: start; }
.doc { background: var(--bg-2); border: 1px solid var(--line); font-family: var(--mono); font-size: .9rem; }
.doc-bar { display: flex; align-items: center; gap: 7px; padding: 12px 16px; border-bottom: 1px solid var(--line); }
.doc-bar span { width: 9px; height: 9px; background: var(--line); transform: rotate(45deg); }
.doc-bar em { font-style: normal; color: var(--mute); font-size: .76rem; margin-left: 8px; }
.doc ol { padding: 20px 20px 24px 44px; display: flex; flex-direction: column; gap: 12px; }
.doc li::marker { color: var(--mute); }

.me { display: grid !important; grid-template-columns: 1fr; gap: 44px; align-items: center; }
.photo {
  max-width: 420px; width: 100%; aspect-ratio: 928 / 1152; background: var(--bg-3); position: relative;
  clip-path: polygon(22px 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%, 0 22px);
}
.photo img { width: 100%; height: 100%; object-fit: cover; filter: saturate(.9) contrast(1.03); }
.me-text { display: flex; flex-direction: column; gap: 18px; }
.me-text > p { color: var(--mute); max-width: 58ch; }
.tools { display: flex; flex-wrap: wrap; gap: 8px; }
.tools span { font-family: var(--mono); font-size: .78rem; border: 1px solid var(--line); padding: 5px 10px; }
.founder { margin-top: 8px; padding: 22px; border: 1px solid var(--silver-2); background: var(--bg); display: flex; flex-direction: column; gap: 10px; }
.founder p:not(.label) { color: var(--mute); }
.founder strong { color: var(--ink); }

.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); padding: 22px 4px; }
.faq summary { cursor: pointer; list-style: none; display: flex; justify-content: space-between; gap: 18px; font-weight: 600; font-size: 1.08rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-family: var(--mono); color: var(--mute); font-size: 1.3rem; line-height: 1; }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin-top: 12px; color: var(--mute); max-width: 68ch; }

.slogan { border-top: 1px solid var(--line); background: var(--bg-2); }
.slogan .wrap { padding-block: 88px; }
.slogan-text { font-family: var(--display); font-weight: 700; font-size: clamp(2rem, 5.4vw, 4.4rem); line-height: 1.08; letter-spacing: -0.01em; text-wrap: balance; max-width: 20ch; }
.slogan-text .dia { display: inline-block; width: .32em; height: .32em; margin-right: .35em; vertical-align: .2em; }
.contact { overflow: hidden; isolation: isolate; border-top: 1px solid var(--line); }
.contact-gradient { --mx: 30%; --my: 60%; }
.contact-inner { padding-block: 110px; display: flex; flex-direction: column; gap: 24px; align-items: flex-start; }
.big-link {
  font-family: var(--display); font-weight: 700; font-size: clamp(1.8rem, 5vw, 3.6rem); line-height: 1.1;
  background-image: linear-gradient(var(--ink), var(--ink)); background-size: 0% 3px; background-repeat: no-repeat; background-position: 0 100%;
  transition: background-size .5s var(--ease-out); padding-bottom: 4px;
}
.big-link:hover { background-size: 100% 3px; }
.contact-list { list-style: none; display: flex; flex-direction: column; gap: 4px; width: 100%; max-width: 640px; border-top: 1px solid var(--line); margin-top: 10px; }
.contact-list li { display: grid; grid-template-columns: 96px 1fr auto; gap: 12px; align-items: center; padding: 14px 0; border-bottom: 1px solid var(--line); min-width: 0; }
.contact-list .k { font-family: var(--mono); font-size: .74rem; text-transform: uppercase; letter-spacing: .1em; color: var(--mute); }
.contact-list .v { font-family: var(--mono); font-size: .95rem; overflow-wrap: anywhere; min-width: 0; }
.copy { font-family: var(--mono); font-size: .72rem; border: 1px solid var(--line); padding: 5px 10px; color: var(--mute); transition: color .2s, border-color .2s; }
.copy:hover { color: var(--ink); border-color: var(--silver-2); }

.footer { border-top: 1px solid var(--line); }
.footer-inner { padding-block: 28px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; font-size: .85rem; color: var(--mute); }

/* 7. Effects: aparición al hacer scroll (solo si hay JS) */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .8s var(--ease-out), transform .8s var(--ease-out); }
.js .reveal.is-in { opacity: 1; transform: none; }

/* 8. Responsive */
@media (min-width: 720px) {
  .pains { grid-template-columns: 1fr 1fr; column-gap: 40px; }
  .steps { grid-template-columns: repeat(3, 1fr); }
  .facts { grid-template-columns: repeat(3, 1fr); column-gap: 32px; }
}
@media (min-width: 960px) {
  .nav-links { display: flex; }
  .story { grid-template-columns: 1.1fr .9fr; gap: 72px; }
  .deliv { grid-template-columns: .9fr 1.1fr; gap: 64px; }
  .me { grid-template-columns: 400px 1fr; gap: 72px; }
}

/* 9. Reduced motion: solo lo intrusivo */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-gradient { transition: none; }
}