/* ──────────────────────────────────────────────────────────────────────
   CASE STUDY — shared stylesheet
   Used by all proyectos/<slug>.html
   ────────────────────────────────────────────────────────────────────── */

:root {
  --black: #000000;
  --white: #ffffff;
  --accent: #D4391E;
  --bg: var(--black);
  --bg-soft: #0a0a0a;
  --bg-line: #1c1c1c;
  --fg: #f4f1eb;
  --fg-soft: rgba(244,241,235,0.62);
  --fg-mute: rgba(244,241,235,0.38);
  --rule: rgba(244,241,235,0.12);
  --max: 1480px;
  --pad: clamp(20px, 4vw, 56px);
  --f-display: "Manrope", "Albert Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --f-alt:     "Albert Sans", "Manrope", sans-serif;
  --f-mono:    "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--fg); }
html { scroll-behavior: smooth; }
body {
  font-family: var(--f-display);
  font-feature-settings: "ss01" on, "kern" on;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
::selection { background: var(--accent); color: var(--white); }

/* ── Atoms ─────────────────────────────────────────────────────────── */
.chapter {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-block;
}
.reveal {
  opacity: 0; transform: translateY(20px);
  transition: opacity 800ms cubic-bezier(.2,.7,.2,1) var(--reveal-delay, 0ms),
              transform 800ms cubic-bezier(.2,.7,.2,1) var(--reveal-delay, 0ms);
}
.reveal.is-in { opacity: 1; transform: translateY(0); }

.t-dot { color: var(--accent); }

/* ── Sticky Nav ───────────────────────────────────────────────────── */
.csnav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center;
  padding: 18px var(--pad);
  transition: padding .3s ease, background .35s ease;
}
.csnav--scrolled {
  padding: 12px var(--pad);
  background: color-mix(in oklab, var(--bg) 84%, transparent);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--rule);
}
.csnav__back {
  display: inline-flex; align-items: center; gap: 12px;
  font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--fg-soft);
  padding: 10px 14px; border: 1px solid var(--rule); border-radius: 999px;
  transition: color .25s ease, border-color .25s ease, transform .35s ease;
  justify-self: start;
}
.csnav__back:hover { color: var(--accent); border-color: var(--accent); transform: translateX(-3px); }
.csnav__back svg { transition: transform .3s ease; }
.csnav__back:hover svg { transform: translateX(-3px); }
.csnav__counter {
  font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.16em;
  color: var(--fg-mute); text-transform: uppercase; justify-self: center;
}
.csnav__brand { justify-self: end; color: var(--fg); display: inline-flex; }
.csnav__brand:hover { color: var(--accent); }

/* ── Hero ─────────────────────────────────────────────────────────── */
.cshero {
  padding: clamp(140px, 22vh, 220px) var(--pad) clamp(60px, 10vh, 100px);
  max-width: var(--max); margin: 0 auto;
}
.cshero__chapter { margin-bottom: 28px; }
.cshero__title {
  margin: 0 0 24px;
  font-family: var(--f-display);
  font-size: clamp(80px, 14vw, 220px);
  font-weight: 800;
  line-height: 0.9; letter-spacing: -0.045em;
  text-wrap: balance;
}
.cshero__tagline {
  margin: 0 0 56px;
  font-family: var(--f-display);
  font-size: clamp(22px, 2.4vw, 32px);
  font-weight: 400; line-height: 1.3; letter-spacing: -0.015em;
  color: var(--fg);
  max-width: 760px;
  text-wrap: pretty;
}
.cshero__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 24px;
  padding-top: 28px;
  border-top: 1px solid var(--rule);
}
.metacell { display: flex; flex-direction: column; gap: 6px; }
.metacell__label {
  font-family: var(--f-mono); font-size: 10.5px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--fg-mute);
}
.metacell__value {
  font-family: var(--f-display);
  font-size: 16px; font-weight: 500;
  letter-spacing: -0.005em;
  color: var(--fg);
}

/* ── Cover image ──────────────────────────────────────────────────── */
.cscover {
  position: relative;
  max-width: var(--max); margin: 0 auto;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-radius: 8px;
  margin-bottom: clamp(80px, 14vh, 160px);
}
.cscover__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.06) 1px, transparent 1px);
  background-size: 8.333% 12.5%;
}
.cscover__mark {
  position: absolute; left: 36px; bottom: 32px;
  color: var(--white);
  mix-blend-mode: difference;
  opacity: 0.95;
}
.cscover__corner {
  position: absolute; top: 28px; left: 32px;
  display: inline-flex; gap: 10px;
  font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--white);
  mix-blend-mode: difference;
}
.cscover__placeholder {
  position: absolute; top: 28px; right: 32px;
  display: flex; flex-direction: column; align-items: flex-end; gap: 4px;
  font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--white);
  mix-blend-mode: difference; text-align: right;
}
.cscover__placeholder-hint {
  font-size: 10px; opacity: 0.7;
  text-transform: none; letter-spacing: 0.04em;
}

/* ── CSBlock (text section) ────────────────────────────────────────── */
.csblock {
  max-width: var(--max); margin: 0 auto;
  padding: clamp(40px, 6vh, 80px) var(--pad);
}
.csblock__grid {
  display: grid; grid-template-columns: 1fr; gap: 32px;
}
@media (min-width: 900px) {
  .csblock__grid { grid-template-columns: 0.55fr 0.95fr; gap: 80px; }
}
.csblock__head { display: flex; flex-direction: column; gap: 14px; align-self: start; position: sticky; top: 100px; }
@media (max-width: 899px) {
  .csblock__head { position: relative; top: 0; }
}
.csblock__title {
  margin: 0;
  font-family: var(--f-display);
  font-size: clamp(34px, 4.2vw, 56px);
  font-weight: 700; line-height: 1; letter-spacing: -0.03em;
  text-wrap: balance;
}
.csblock__body {
  margin: 0;
  font-family: var(--f-display);
  font-size: clamp(17px, 1.4vw, 21px);
  line-height: 1.55; font-weight: 400;
  color: var(--fg);
  max-width: 720px;
  text-wrap: pretty;
}

/* ── Sistema visual ───────────────────────────────────────────────── */
.cssystem {
  max-width: var(--max); margin: 0 auto;
  padding: clamp(60px, 10vh, 120px) var(--pad);
  border-top: 1px solid var(--rule);
}
.cssystem__head {
  display: flex; flex-direction: column; gap: 14px;
  margin-bottom: 56px;
}
.cssystem__palette {
  display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.swatch {
  aspect-ratio: 3 / 4;
  padding: 20px;
  border-radius: 6px;
  display: flex; flex-direction: column; justify-content: space-between;
  position: relative; overflow: hidden;
  border: 1px solid var(--rule);
}
.swatch__name {
  font-family: var(--f-mono); font-size: 10.5px; letter-spacing: 0.14em;
  text-transform: uppercase;
}
.swatch__hex {
  font-family: var(--f-mono); font-size: 13px; letter-spacing: 0.06em;
}
.cssystem__type {
  margin-top: 40px;
  padding: 40px;
  border: 1px solid var(--rule);
  border-radius: 6px;
  display: flex; flex-direction: column; gap: 16px;
  align-items: flex-start;
}
.cssystem__type-specimen {
  font-family: var(--f-display);
  font-size: clamp(80px, 14vw, 200px);
  font-weight: 800; line-height: 1; letter-spacing: -0.04em;
  color: var(--fg);
}
.cssystem__type-meta {
  font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.1em;
  color: var(--fg-mute); text-transform: uppercase;
}

/* ── Gallery ──────────────────────────────────────────────────────── */
.csgallery {
  max-width: var(--max); margin: 0 auto;
  padding: clamp(60px, 10vh, 120px) var(--pad);
  border-top: 1px solid var(--rule);
}
.csgrid {
  display: grid; gap: 20px;
  grid-template-columns: repeat(6, 1fr);
}
.csg {
  position: relative; overflow: hidden;
  border-radius: 6px;
  grid-column: span 6;
}
.csg--span1 { grid-column: span 6; }
.csg--span2 { grid-column: span 6; }
.csg--span3 { grid-column: span 6; }
@media (min-width: 800px) {
  .csg--span1 { grid-column: span 2; }
  .csg--span2 { grid-column: span 3; }
  .csg--span3 { grid-column: span 6; }
}
.csg__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 20% 20%;
}
.csg__label {
  position: absolute; top: 20px; left: 20px;
  font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--white);
  mix-blend-mode: difference;
}
.csg__pl {
  position: absolute; bottom: 20px; right: 20px;
  font-family: var(--f-mono); font-size: 10px; letter-spacing: 0.08em;
  color: var(--white); opacity: 0.6;
  mix-blend-mode: difference;
}

/* ── Entregables ──────────────────────────────────────────────────── */
.csdeliv {
  max-width: var(--max); margin: 0 auto;
  padding: clamp(60px, 10vh, 120px) var(--pad);
  border-top: 1px solid var(--rule);
}
.csdeliv__list {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column;
}
.csdeliv__item {
  display: grid;
  grid-template-columns: 80px 1fr;
  align-items: center;
  padding: 24px 0;
  border-bottom: 1px solid var(--rule);
  gap: 24px;
  transition: background .25s ease, padding-left .35s ease;
}
.csdeliv__item:hover {
  background: var(--bg-soft);
  padding-left: 16px;
}
.csdeliv__n {
  font-family: var(--f-mono); font-size: 13px; color: var(--fg-mute);
  letter-spacing: 0.1em;
}
.csdeliv__t {
  font-family: var(--f-display);
  font-size: clamp(20px, 2.4vw, 32px);
  font-weight: 500; letter-spacing: -0.015em;
  line-height: 1.1;
}
.csdeliv__item:hover .csdeliv__t { color: var(--accent); }

/* ── Next project ─────────────────────────────────────────────────── */
.csnext {
  display: block;
  max-width: var(--max); margin: 0 auto;
  padding: clamp(80px, 14vh, 160px) var(--pad);
  border-top: 1px solid var(--rule);
  position: relative; overflow: hidden;
  transition: background .4s ease;
}
.csnext:hover { background: var(--bg-soft); }
.csnext__inner {
  display: flex; flex-direction: column; gap: 18px;
  align-items: flex-start;
}
.csnext__title {
  margin: 0;
  font-family: var(--f-display);
  font-size: clamp(48px, 8vw, 120px);
  font-weight: 800; line-height: 0.94; letter-spacing: -0.04em;
  display: inline-flex; align-items: center; gap: 24px; flex-wrap: wrap;
  transition: color .3s ease;
}
.csnext:hover .csnext__title { color: var(--accent); }
.csnext:hover .csnext__title svg { transform: translateX(12px); color: var(--accent); }
.csnext__title svg { transition: transform .45s cubic-bezier(.2,.7,.2,1); }
.csnext__cat {
  font-family: var(--f-mono); font-size: 12px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--fg-soft);
}

/* ── Footer ───────────────────────────────────────────────────────── */
.csfoot {
  border-top: 1px solid var(--rule);
  padding: clamp(50px, 8vh, 80px) var(--pad) 24px;
}
.csfoot__top {
  max-width: var(--max); margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 24px;
  padding-bottom: 24px; border-bottom: 1px solid var(--rule);
}
.csfoot__brand { color: var(--fg); }
.csfoot__links {
  display: flex; gap: 22px;
  font-family: var(--f-display); font-size: 14px;
  color: var(--fg-soft);
}
.csfoot__links a { transition: color .25s ease; }
.csfoot__links a:hover { color: var(--accent); }
.csfoot__bottom {
  max-width: var(--max); margin: 0 auto;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  padding-top: 22px;
  font-family: var(--f-mono); font-size: 10.5px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--fg-mute);
}

@media (max-width: 720px) {
  .csnav__back span { display: none; }
}