/* PreparaTEC — base compartida (landing + taller). Hereda el sistema «papel / cianotipo» de luis.altto.mx:
   hoja de dibujo técnico, papel milimétrico claro por default, modo oscuro = cianotipo.
   Paleta: tinta, azul de Prusia, blanco. Fuentes propias (sin CDNs). */

@font-face { font-family: 'Space Grotesk'; src: url('/static/fonts/SpaceGrotesk-var.woff2') format('woff2'); font-weight: 300 700; font-style: normal; font-display: swap; }
@font-face { font-family: 'Inter'; src: url('/static/fonts/Inter-var.woff2') format('woff2'); font-weight: 100 900; font-style: normal; font-display: swap; }
@font-face { font-family: 'DM Mono'; src: url('/static/fonts/DMMono-400.woff2') format('woff2'); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: 'Fraunces'; src: url('/static/fonts/Fraunces-var.woff2') format('woff2'); font-weight: 100 900; font-style: normal; font-display: swap; }

:root {
  --module: 28px;
  --maxw: 1176px;
  --pad: clamp(18px, 4.5vw, 56px);
  --paper: #FAFBFD; --paper2: #F1F5FA; --panel: #FFFFFF;
  --ink: #0C1523; --muted: #3E4F66; --faint: #51637C;
  --blue: #16418A; --blue-strong: #0E3068; --blue-soft: #DCE6F5; --blue-mid: #7E9CC9;
  --grid: #E4EBF5; --grid-major: #CBD9EB; --line: #C7D3E4; --line-strong: #8FA4C0; --frame: #23374F;
  --ok: #1F7A4D; --ok-soft: #DDF2E6; --bad: #B3261E; --bad-soft: #F9E0DE; --warn: #8A5A00; --warn-soft: #FBEED2;
  --term-bg: #0B1220; --term-ink: #D7E4F7; --term-accent: #8FB8F2;
  --shadow: 0 1px 0 rgba(12,21,35,.04), 0 8px 24px -18px rgba(12,21,35,.35);
}
:root[data-theme="ciano"] {
  --paper: #0B2649; --paper2: #0A2140; --panel: #0F2E57;
  --ink: #EAF2FC; --muted: #C0D2EA; --faint: #93ADD1;
  --blue: #9CC3F9; --blue-strong: #C4DBFC; --blue-soft: rgba(156,195,249,.13); --blue-mid: #5B7FB4;
  --grid: rgba(214,230,250,.07); --grid-major: rgba(214,230,250,.14); --line: rgba(199,219,244,.22); --line-strong: rgba(199,219,244,.45); --frame: #B9CFEC;
  --ok: #7ED7A6; --ok-soft: rgba(126,215,166,.16); --bad: #FF9A93; --bad-soft: rgba(255,154,147,.16); --warn: #F3C66C; --warn-soft: rgba(243,198,108,.16);
  --shadow: none;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid-major) 1px, transparent 1px), linear-gradient(90deg, var(--grid-major) 1px, transparent 1px),
    linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 140px 140px, 140px 140px, 28px 28px, 28px 28px;
  background-position: calc(50% - 588px) 0, calc(50% - 588px) 0, calc(50% - 588px) 0, calc(50% - 588px) 0;
  color: var(--ink); font-family: 'Inter', system-ui, sans-serif; font-size: 16px; line-height: 1.6;
  -webkit-font-smoothing: antialiased; overflow-x: hidden; min-height: 100svh;
  transition: background-color .4s ease, color .4s ease;
}
::selection { background: var(--blue); color: var(--paper); }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
img, svg { max-width: 100%; display: block; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
input, select, textarea { font: inherit; color: var(--ink); }
.mono { font-family: 'DM Mono', ui-monospace, monospace; letter-spacing: .06em; }
h1, h2, h3, h4 { font-family: 'Space Grotesk', 'Inter', sans-serif; font-weight: 600; line-height: 1.12; letter-spacing: -.015em; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.skip { position: fixed; top: -60px; left: 16px; z-index: 200; background: var(--blue); color: var(--paper); padding: 12px 18px; font-size: 12px; transition: top .2s; }
.skip:focus { top: 12px; text-decoration: none; }

/* ── Marca ─────────────────────────────────────────── */
.marca { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); letter-spacing: .2em; font-size: 13px; white-space: nowrap; }
.marca:hover { text-decoration: none; }
.marca svg { width: 26px; height: 26px; flex-shrink: 0; }
.marca b { font-weight: 400; color: var(--blue); }

/* ── Nav ───────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 100; display: flex; align-items: center; justify-content: space-between; gap: 18px;
  padding: 11px var(--pad); background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--line);
}
.nav-links { display: flex; gap: clamp(4px, 1.4vw, 16px); align-items: center; overflow-x: auto; scrollbar-width: none; }
.nav-links::-webkit-scrollbar { display: none; }
.nav-links a, .nav-links button { color: var(--muted); font-size: 12px; letter-spacing: .1em; text-transform: uppercase; padding: 10px 6px; white-space: nowrap; font-family: 'DM Mono', monospace; }
.nav-links a:hover, .nav-links button:hover { color: var(--ink); text-decoration: none; }
.nav-links a.active, .nav-links a[aria-current="page"] { color: var(--blue); box-shadow: inset 0 -2px var(--blue); }
.nav-right { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.theme-btn { font-size: 10.5px; letter-spacing: .18em; color: var(--blue); background: var(--blue-soft); border: 1px solid var(--line-strong); padding: 9px 12px; font-family: 'DM Mono', monospace; }
.theme-btn:hover { border-color: var(--blue); }
.tb-ciano { display: none; }
:root[data-theme="ciano"] .tb-papel { display: none; }
:root[data-theme="ciano"] .tb-ciano { display: inline; }
.nav-cta { border: 1.5px solid var(--ink); padding: 9px 14px; color: var(--ink); font-size: 11px; letter-spacing: .16em; font-family: 'DM Mono', monospace; white-space: nowrap; }
.nav-cta:hover { background: var(--ink); color: var(--paper); text-decoration: none; }

/* ── Layout de hoja ────────────────────────────────── */
.section { max-width: var(--maxw); margin: 0 auto; padding: clamp(56px, 9vh, 110px) var(--pad); }
.section.tight { padding-top: clamp(28px, 5vh, 56px); padding-bottom: clamp(28px, 5vh, 56px); }
.sec-head { display: flex; align-items: baseline; gap: 18px; margin-bottom: 14px; flex-wrap: wrap; }
.sec-index { color: var(--faint); font-size: 12px; letter-spacing: .22em; white-space: nowrap; }
.sec-head h1, .sec-head h2 { font-size: clamp(27px, 4vw, 46px); font-weight: 700; }
.sec-rule { flex: 1; height: 1.5px; background: var(--line-strong); min-width: 40px; transform-origin: left; transform: scaleX(0); transition: transform 1.1s cubic-bezier(.2,.7,.2,1) .15s; }
.sec-head.in .sec-rule, html:not(.js) .sec-rule { transform: scaleX(1); }
.sec-sub { color: var(--muted); max-width: 64ch; margin-bottom: clamp(22px, 4vh, 40px); }
.sec-meter { display: flex; align-items: center; gap: 14px; margin: 2px 0 18px; }
.meter-line { flex: 0 0 clamp(60px, 12vw, 150px); height: 1.5px; background: var(--blue); position: relative; transform-origin: left; transform: scaleX(0); transition: transform .8s steps(12) .1s; }
.meter-line::before, .meter-line::after { content: ''; position: absolute; top: -5px; width: 1.5px; height: 11px; background: var(--blue); }
.meter-line::before { left: 0; } .meter-line::after { right: 0; opacity: 0; transition: opacity .1s ease .9s; }
.sec-meter.in .meter-line, html:not(.js) .meter-line { transform: scaleX(1); }
.sec-meter.in .meter-line::after, html:not(.js) .meter-line::after { opacity: 1; }
.meter-label { color: var(--blue); font-size: 11.5px; letter-spacing: .2em; font-variant-numeric: tabular-nums; }
.block-label { color: var(--faint); font-size: 11px; letter-spacing: .24em; border-bottom: 1.5px solid var(--line-strong); padding-bottom: 10px; margin-bottom: 16px; font-family: 'DM Mono', monospace; }

/* ── Botones, chips, specs ─────────────────────────── */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font-family: 'DM Mono', monospace; font-size: 11.5px; letter-spacing: .16em; text-transform: uppercase; padding: 14px 20px; border: 1.5px solid var(--ink); color: var(--ink); background: transparent; white-space: nowrap; transition: background .15s, color .15s, border-color .15s; }
.btn:hover { text-decoration: none; background: var(--ink); color: var(--paper); }
.btn-solid { background: var(--blue); border-color: var(--blue); color: #FFFFFF; }
.btn-solid:hover { background: var(--blue-strong); border-color: var(--blue-strong); color: #fff; }
:root[data-theme="ciano"] .btn-solid { color: #0B2649; }
:root[data-theme="ciano"] .btn-solid:hover { color: #0B2649; }
.btn-soft { border-color: var(--line-strong); color: var(--blue); background: var(--blue-soft); }
.btn-soft:hover { background: var(--blue); color: #fff; border-color: var(--blue); }
.btn-sm { padding: 9px 13px; font-size: 10.5px; }
.btn-lg { padding: 17px 26px; font-size: 12.5px; }
.btn[disabled], .btn.disabled { opacity: .45; pointer-events: none; }
.btn-ghost { border-color: transparent; color: var(--muted); }
.btn-ghost:hover { background: var(--blue-soft); color: var(--ink); }
.btn-bad { border-color: var(--bad); color: var(--bad); }
.btn-bad:hover { background: var(--bad); color: #fff; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips span, .chip { font-family: 'DM Mono', monospace; font-size: 11px; letter-spacing: .08em; padding: 5px 10px; background: var(--blue-soft); color: var(--blue); border: 1px solid var(--line); display: inline-block; }
.chip.ok { color: var(--ok); background: var(--ok-soft); border-color: transparent; }
.chip.bad { color: var(--bad); background: var(--bad-soft); border-color: transparent; }
.chip.warn { color: var(--warn); background: var(--warn-soft); border-color: transparent; }
.chip.pro { background: var(--blue); color: #fff; border-color: var(--blue); }
:root[data-theme="ciano"] .chip.pro { color: #0B2649; }
.spec { list-style: none; margin: 16px 0 0; border-top: 1.5px solid var(--line-strong); font-family: 'DM Mono', monospace; }
.spec li { display: flex; justify-content: space-between; gap: 14px; padding: 9px 2px; border-bottom: 1px dashed var(--line); font-size: 12px; }
.spec li span:first-child { color: var(--faint); letter-spacing: .16em; white-space: nowrap; }
.spec li span:last-child { color: var(--ink); text-align: right; letter-spacing: .02em; }

/* ── Cards delineadas ──────────────────────────────── */
.drafted { position: relative; border: 1px solid var(--line); background: color-mix(in srgb, var(--panel) 80%, transparent); }
.drafted::before, .drafted::after { content: ''; position: absolute; background: var(--blue); z-index: 1; pointer-events: none; }
.drafted::before { top: -1px; left: -1px; right: -1px; height: 1.5px; transform: scaleX(0); transform-origin: left; transition: transform .8s cubic-bezier(.3,0,.2,1); }
.drafted::after { top: -1px; left: -1px; bottom: -1px; width: 1.5px; transform: scaleY(0); transform-origin: top; transition: transform .8s cubic-bezier(.3,0,.2,1) .15s; }
.drafted.in::before, html:not(.js) .drafted::before { transform: scaleX(1); }
.drafted.in::after, html:not(.js) .drafted::after { transform: scaleY(1); }
.card { padding: 20px 22px; display: flex; flex-direction: column; gap: 10px; }
.card h3 { font-size: 19px; }
.card p { color: var(--muted); font-size: 14.5px; }
.pieza-id { color: var(--faint); font-size: 11px; letter-spacing: .22em; font-family: 'DM Mono', monospace; }

/* ── Stats ─────────────────────────────────────────── */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1.5px solid var(--frame); border-bottom: 1.5px solid var(--frame); }
.stat { padding: clamp(16px, 3vw, 28px) clamp(14px, 2vw, 26px); border-right: 1px solid var(--line); background: color-mix(in srgb, var(--panel) 55%, transparent); }
.stat:last-child { border-right: 0; }
.stat-n { font-family: 'DM Mono', monospace; font-size: clamp(26px, 3.4vw, 40px); color: var(--blue); line-height: 1; font-variant-numeric: tabular-nums; }
.stat-l { color: var(--muted); font-size: 13px; margin-top: 8px; line-height: 1.45; }

/* ── Formularios ───────────────────────────────────── */
.campo { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.campo label { font-family: 'DM Mono', monospace; font-size: 10.5px; letter-spacing: .2em; color: var(--faint); text-transform: uppercase; }
.campo input, .campo select, .campo textarea { padding: 12px 13px; border: 1px solid var(--line-strong); background: var(--panel); font-size: 16px; border-radius: 0; width: 100%; }
.campo input:focus, .campo select:focus, .campo textarea:focus { border-color: var(--blue); outline: none; box-shadow: inset 0 -2px var(--blue); }
.campo small { color: var(--faint); font-size: 12px; }
.fila { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.error { color: var(--bad); background: var(--bad-soft); padding: 10px 12px; font-size: 14px; border-left: 3px solid var(--bad); }
.aviso { color: var(--warn); background: var(--warn-soft); padding: 10px 12px; font-size: 14px; border-left: 3px solid var(--warn); }
.exito { color: var(--ok); background: var(--ok-soft); padding: 10px 12px; font-size: 14px; border-left: 3px solid var(--ok); }

/* ── Tablas ────────────────────────────────────────── */
.tabla-wrap { overflow-x: auto; border: 1px solid var(--line); background: var(--panel); }
table.tabla { width: 100%; border-collapse: collapse; font-size: 14px; }
table.tabla th { text-align: left; font-family: 'DM Mono', monospace; font-weight: 400; font-size: 10.5px; letter-spacing: .18em; color: var(--faint); padding: 10px 12px; border-bottom: 1.5px solid var(--line-strong); white-space: nowrap; }
table.tabla td { padding: 10px 12px; border-bottom: 1px dashed var(--line); vertical-align: top; }
table.tabla tr:last-child td { border-bottom: 0; }
table.tabla td.num { font-family: 'DM Mono', monospace; font-variant-numeric: tabular-nums; white-space: nowrap; }

/* ── Prosa (resúmenes, guías, explicaciones) ───────── */
.prosa { font-size: 16px; line-height: 1.7; max-width: 72ch; }
.prosa h1 { font-size: clamp(26px, 3.4vw, 38px); margin: 0 0 .5em; }
.prosa h2 { font-size: clamp(21px, 2.4vw, 27px); margin: 1.6em 0 .5em; padding-top: .6em; border-top: 1px solid var(--line); }
.prosa h3 { font-size: 18.5px; margin: 1.3em 0 .4em; }
.prosa h4 { font-size: 16px; margin: 1.1em 0 .3em; font-family: 'DM Mono', monospace; font-weight: 400; letter-spacing: .08em; color: var(--faint); text-transform: uppercase; font-size: 11.5px; }
.prosa p { margin: 0 0 1em; }
.prosa ul, .prosa ol { margin: 0 0 1em 1.3em; }
.prosa li { margin-bottom: .35em; }
.prosa li > p { margin-bottom: .35em; }
.prosa blockquote { border-left: 3px solid var(--blue); padding: 4px 14px; color: var(--muted); margin: 0 0 1em; background: var(--blue-soft); }
.prosa code { font-family: 'DM Mono', monospace; font-size: .9em; background: var(--paper2); padding: 1px 5px; border: 1px solid var(--line); }
.prosa pre { background: var(--term-bg); color: var(--term-ink); padding: 14px 16px; overflow-x: auto; margin: 0 0 1em; font-size: 13.5px; }
.prosa pre code { background: none; border: 0; padding: 0; color: inherit; }
.prosa table { width: 100%; border-collapse: collapse; margin: 0 0 1.2em; font-size: 14.5px; display: block; overflow-x: auto; }
.prosa th, .prosa td { border: 1px solid var(--line); padding: 7px 10px; text-align: left; vertical-align: top; }
.prosa th { background: var(--paper2); font-family: 'DM Mono', monospace; font-weight: 400; font-size: 11px; letter-spacing: .12em; color: var(--faint); }
.prosa strong { color: var(--ink); }
.prosa hr { border: 0; border-top: 1px dashed var(--line-strong); margin: 1.6em 0; }
.prosa img { margin: 0 auto 1em; border: 1px solid var(--line); }
.prosa a { text-decoration: underline; text-underline-offset: 3px; }
.prosa .fuente { color: var(--faint); font-size: 12.5px; }

/* ── Cajetín (pie) ─────────────────────────────────── */
.titleblock { border-top: 2px solid var(--frame); background: var(--paper2); margin-top: clamp(40px, 8vh, 90px); }
.tb-grid { max-width: var(--maxw); margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr; }
.tb-cell { padding: 22px clamp(16px, 2.5vw, 32px); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); font-size: 14.5px; }
.tb-cell:nth-child(3n+1) { border-left: 1px solid var(--line); }
.tb-name { grid-row: span 2; display: flex; flex-direction: column; justify-content: center; }
.tb-label { color: var(--faint); font-size: 10.5px; letter-spacing: .26em; margin-bottom: 8px; font-family: 'DM Mono', monospace; }
.tb-big { font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: clamp(22px, 3vw, 30px); line-height: 1.12; text-transform: uppercase; letter-spacing: -.01em; }
.tb-small { color: var(--faint); font-size: 10.5px; letter-spacing: .12em; margin-top: 12px; font-family: 'DM Mono', monospace; line-height: 1.6; }
.tb-cell a { color: var(--ink); display: inline-block; padding: 4px 0; }
.tb-cell a:hover { color: var(--blue); }
.tb-full { grid-column: 1 / -1; border-left: 1px solid var(--line); color: var(--faint); font-size: 12px; line-height: 1.6; }

/* ── Reveal ────────────────────────────────────────── */
html.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s cubic-bezier(.2,.7,.2,1), transform .7s cubic-bezier(.2,.7,.2,1); }
html.js .drafted.reveal { transform: none; }
html.js .reveal.in { opacity: 1; transform: none; }
.d1 { transition-delay: .1s; } .d2 { transition-delay: .2s; } .d3 { transition-delay: .3s; } .d4 { transition-delay: .4s; }

/* ── Toast ─────────────────────────────────────────── */
.toast { position: fixed; left: 50%; bottom: 22px; transform: translateX(-50%) translateY(20px); background: var(--ink); color: var(--paper); padding: 12px 18px; font-size: 14px; opacity: 0; pointer-events: none; transition: opacity .25s, transform .25s; z-index: 300; max-width: min(92vw, 520px); border-left: 3px solid var(--blue); }
.toast.on { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 980px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2n) { border-right: 0; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .tb-grid { grid-template-columns: 1fr 1fr; }
  .tb-name { grid-column: span 2; grid-row: auto; }
}
@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .nav { padding: 9px 12px; gap: 8px; }
  .nav-links { mask-image: linear-gradient(90deg, black 84%, transparent); -webkit-mask-image: linear-gradient(90deg, black 84%, transparent); }
  .nav-links a, .nav-links button { font-size: 10.5px; padding: 10px 5px; }
  .nav-cta { padding: 8px 10px; font-size: 10px; }
  .theme-btn { padding: 8px 8px; font-size: 9.5px; }
  .stats { grid-template-columns: 1fr 1fr; }
  .tb-grid { grid-template-columns: 1fr; }
  .tb-name { grid-column: auto; }
  .tb-cell:nth-child(3n+1) { border-left: 0; }
  .tb-cell { border-right: 0; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  html.js .reveal { opacity: 1; transform: none; transition: none; }
  .sec-rule, .meter-line { transform: scaleX(1); transition: none; }
  .meter-line::after { opacity: 1; }
  .drafted::before { transform: scaleX(1); transition: none; }
  .drafted::after { transform: scaleY(1); transition: none; }
}