/* ============================================================
   Impossible Labs — clean-room delivery
   Dark-slate engineering aesthetic (matched to marcellomorettoni.com):
   Inter + Fira Code, cyan / sky / indigo on near-black slate.
   ============================================================ */

/* ---- Fonts (self-hosted; no third-party origins) ---- */
@font-face {
  font-family: "Inter";
  src: url("/delivery/assets/fonts/inter-vf.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Fira Code";
  src: url("/delivery/assets/fonts/fira-code-vf.woff2") format("woff2");
  font-weight: 300 700;
  font-style: normal;
  font-display: swap;
}

/* ---- Tokens ---- */
:root {
  --bg:        #020617;  /* slate-950 */
  --bg-2:      #060c1b;  /* alt section */
  --panel:     #0b1326;  /* card */
  --panel-2:   #0f1a30;  /* raised card */
  --line:      #1e293b;  /* slate-800 */
  --line-2:    #334155;  /* slate-700 */

  --heading:   #f8fafc;
  --text:      #cbd5e1;  /* slate-300 */
  --muted:     #94a3b8;  /* slate-400 */
  --faint:     #64748b;  /* slate-500 */

  --cyan:      #22d3ee;
  --sky:       #0ea5e9;
  --indigo:    #818cf8;
  --rose:      #fb7185;  /* used only for the "blocked" marker */

  --grad:      linear-gradient(100deg, #22d3ee 0%, #38bdf8 45%, #818cf8 100%);

  --font-body: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --font-mono: "Fira Code", ui-monospace, SFMono-Regular, Menlo, monospace;

  --wrap: 1140px;
  --gut: clamp(1.25rem, 5vw, 4rem);
  --r: 14px;
  --t: 200ms cubic-bezier(.22, .61, .36, 1);
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--cyan); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--sky); }
h1, h2, h3 { color: var(--heading); font-weight: 700; line-height: 1.08; margin: 0; letter-spacing: -0.02em; }
p { margin: 0; }
ol, ul { margin: 0; padding: 0; list-style: none; }
strong { font-weight: 650; color: var(--heading); }

::selection { background: rgba(34, 211, 238, .25); color: #fff; }

:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 4px; }

.skip-link {
  position: absolute; left: 50%; top: 0;
  transform: translateX(-50%) translateY(-130%);
  background: var(--cyan); color: #02131a; padding: .6rem 1rem; font-weight: 600;
  border-radius: 0 0 8px 8px; z-index: 100; text-decoration: none; transition: transform var(--t);
}
.skip-link:focus { transform: translateX(-50%) translateY(0); }

.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gut); }

/* ---- Shared type ---- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem; letter-spacing: 0.06em; text-transform: lowercase;
  font-weight: 500; color: var(--cyan); margin-bottom: 1.1rem;
}
.eyebrow::before { content: "// "; color: var(--faint); }
.grad {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.section-title {
  font-size: clamp(1.9rem, 1.3rem + 2.6vw, 3rem);
  max-width: 20ch; margin-top: .2rem;
}
.section-lede {
  font-size: clamp(1.05rem, 1rem + 0.5vw, 1.28rem);
  color: var(--muted); max-width: 56ch; margin-top: 1.1rem;
}
.muted { color: var(--muted); font-weight: 400; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; gap: .5ch;
  background: var(--grad); color: #02131a;
  font-weight: 600; font-size: 1rem;
  padding: .82rem 1.4rem; border-radius: 999px; white-space: nowrap;
  text-decoration: none; border: 1px solid transparent;
  transition: transform var(--t), box-shadow var(--t), filter var(--t);
  box-shadow: 0 0 0 1px rgba(34,211,238,.25), 0 10px 30px -12px rgba(14,165,233,.6);
}
.btn:hover { color: #02131a; transform: translateY(-1px); filter: brightness(1.06); box-shadow: 0 0 0 1px rgba(34,211,238,.4), 0 14px 34px -12px rgba(14,165,233,.8); }
.btn:active { transform: translateY(0); }
.btn-sm { padding: .52rem 1rem; font-size: .9rem; }
.btn-ghost {
  background: transparent; color: var(--text);
  border-color: var(--line-2); box-shadow: none;
}
.btn-ghost:hover { color: var(--heading); background: rgba(148,163,184,.08); border-color: var(--cyan); box-shadow: none; }

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; gap: 1rem; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: .55rem; text-decoration: none; color: var(--heading); }
.brand-mark { color: #e2e8f0; flex: none; }
.brand-name { font-weight: 700; font-size: 1.1rem; letter-spacing: -0.01em; }
.brand:hover { color: var(--heading); }

.primary-nav { margin-left: auto; display: flex; align-items: center; gap: clamp(.5rem, 1.2vw, .95rem); }
.primary-nav a:not(.btn) { color: var(--muted); text-decoration: none; font-size: .9rem; font-weight: 500; white-space: nowrap; transition: color var(--t); }
.primary-nav a:not(.btn):hover { color: var(--heading); }

.nav-toggle {
  display: none; margin-left: auto;
  width: 44px; height: 44px; border: 1px solid var(--line-2);
  background: transparent; border-radius: 10px; cursor: pointer;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.nav-toggle-bar { width: 20px; height: 2px; background: var(--text); transition: transform var(--t); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(3.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { transform: translateY(-3.5px) rotate(-45deg); }

@media (max-width: 1080px) {
  .nav-toggle { display: flex; }
  .primary-nav {
    position: fixed; inset: 64px 0 auto 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--line);
    padding: .5rem var(--gut) 1.25rem;
    transform: translateY(-120%); transition: transform var(--t);
    margin-left: 0; box-shadow: 0 24px 40px -28px #000;
  }
  .primary-nav.open { transform: translateY(0); }
  .primary-nav a:not(.btn) { padding: .9rem 0; border-bottom: 1px solid var(--line); font-size: 1.05rem; white-space: normal; }
  .primary-nav .btn { margin-top: 1rem; justify-content: center; }
}

/* ============================================================
   Hero
   ============================================================ */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--line); }
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(90deg, rgba(148,163,184,.05) 1px, transparent 1px),
    linear-gradient(0deg, rgba(148,163,184,.05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(120% 80% at 50% 0%, #000 35%, transparent 75%);
  pointer-events: none;
}
.hero::after {
  content: ""; position: absolute; top: -30%; left: 50%; transform: translateX(-50%);
  width: 90%; height: 60%; pointer-events: none;
  background: radial-gradient(closest-side, rgba(14,165,233,.16), transparent 70%);
}
.hero-inner { position: relative; padding-block: clamp(3.5rem, 9vw, 7rem) clamp(3rem, 7vw, 5.5rem); max-width: 60rem; }
.hero-title {
  font-size: clamp(2.4rem, 1.3rem + 5.2vw, 4.7rem);
  margin-block: .4rem .2rem; letter-spacing: -0.03em;
}
.hero-sub { font-size: clamp(1.1rem, 1rem + 0.7vw, 1.4rem); color: var(--muted); max-width: 46ch; margin-top: 1.5rem; line-height: 1.5; }
.hero-sub strong { color: var(--heading); }
.hero-cta { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2rem; }
.hero-meta {
  margin-top: 2.4rem; padding-top: 1.2rem; border-top: 1px solid var(--line);
  font-family: var(--font-mono); font-size: .82rem; color: var(--faint); letter-spacing: .01em;
}
.hero-meta b { color: var(--muted); font-weight: 500; }

/* ============================================================
   How it works
   ============================================================ */
.how { padding-block: clamp(3.5rem, 8vw, 6.5rem); }

/* ---- static schematic ---- */
.diagram {
  margin: clamp(2rem, 5vw, 3.25rem) 0 0;
  background:
    radial-gradient(120% 140% at 50% -10%, rgba(14,165,233,.07), transparent 60%),
    var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: clamp(1.1rem, 3vw, 2rem);
}
.diag-zones {
  display: grid;
  grid-template-columns: 1fr 68px 1fr;
  gap: 0; align-items: stretch;
}
.zone {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.1rem 1.1rem 1.25rem;
  background: var(--bg);
}
.zone-eu { border-color: rgba(34,211,238,.30); background: linear-gradient(180deg, rgba(34,211,238,.05), transparent 60%), var(--bg); }
.zone-cr { border-color: rgba(129,140,248,.30); border-style: dashed; background: linear-gradient(180deg, rgba(129,140,248,.05), transparent 60%), var(--bg); }
.zone-head { display: flex; align-items: center; gap: .55rem; margin-bottom: .9rem; }
.zone-dot { width: 9px; height: 9px; border-radius: 999px; flex: none; }
.zone-eu .zone-dot { background: var(--cyan); box-shadow: 0 0 12px var(--cyan); }
.zone-cr .zone-dot { background: var(--indigo); box-shadow: 0 0 12px var(--indigo); }
.zone-name { font-family: var(--font-mono); font-size: .82rem; letter-spacing: .04em; color: var(--heading); font-weight: 500; }
.zone-tag { margin-left: auto; font-family: var(--font-mono); font-size: .62rem; letter-spacing: .12em; text-transform: uppercase; padding: .18rem .45rem; border-radius: 6px; }
.zone-eu .zone-tag { color: var(--cyan); background: rgba(34,211,238,.12); }
.zone-cr .zone-tag { color: var(--indigo); background: rgba(129,140,248,.12); }
.zone-list { display: grid; gap: .5rem; }
.chip {
  display: flex; align-items: center; gap: .55rem;
  font-size: .9rem; color: var(--text);
  padding: .5rem .65rem; border: 1px solid var(--line); border-radius: 8px;
  background: var(--panel);
}
.chip::before { content: ""; width: 6px; height: 6px; border-radius: 2px; background: var(--faint); flex: none; }
.zone-eu .chip::before { background: var(--cyan); }
.zone-cr .chip::before { background: var(--indigo); }
.zone-foot { margin-top: .75rem; font-size: .78rem; color: var(--muted); font-style: italic; }

/* boundary column */
.boundary { position: relative; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: .6rem; }
.boundary::before {
  content: ""; position: absolute; top: 6px; bottom: 6px; left: 50%; width: 0;
  border-left: 2px dashed var(--line-2);
}
.boundary-mark { position: relative; color: #e2e8f0; }
.boundary-label {
  position: relative; writing-mode: vertical-rl; transform: rotate(180deg);
  font-family: var(--font-mono); font-size: .64rem; letter-spacing: .28em; text-transform: uppercase; color: var(--faint);
}

/* flows band */
.flows { display: grid; gap: .75rem; margin-top: 1.1rem; }
.flow { display: grid; grid-template-columns: minmax(150px, 320px) 1fr; gap: 1rem 1.2rem; align-items: center; padding: .9rem 1rem; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); }
.flow-arrow { width: 100%; height: auto; }
.flow-cap { font-size: .95rem; color: var(--muted); }
.flow-name { font-weight: 650; color: var(--cyan); font-family: var(--font-mono); font-size: .9em; letter-spacing: .02em; }
.flow-name.data { color: var(--indigo); }
.flow-code { border-color: rgba(34,211,238,.25); }
.flow-data { border-color: rgba(129,140,248,.22); }
.diag-caption { margin-top: 1.1rem; font-size: .82rem; color: var(--faint); font-style: italic; }

@media (max-width: 720px) {
  .diag-zones { grid-template-columns: 1fr; gap: 0; }
  .boundary { flex-direction: row; padding: .85rem 0; gap: 1rem; }
  .boundary::before { top: 50%; bottom: auto; left: 6px; right: 6px; width: auto; height: 0; border-left: 0; border-top: 2px dashed var(--line-2); }
  .boundary-label { writing-mode: horizontal-tb; transform: none; }
  .flow { grid-template-columns: 1fr; gap: .6rem; }
  .flow-arrow { max-width: 280px; }
}

/* ---- step cards (static) ---- */
.steps {
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
  display: grid; gap: 1rem; grid-template-columns: repeat(4, 1fr);
  counter-reset: step;
}
.step {
  display: flex; flex-direction: column; gap: .4rem;
  background: var(--panel); border: 1px solid var(--line);
  border-top: 2px solid var(--line-2);
  border-radius: 12px; padding: 1.2rem 1.15rem 1.3rem;
  transition: border-color var(--t), transform var(--t);
}
.step:hover { transform: translateY(-2px); border-top-color: var(--cyan); }
.step-no { font-family: var(--font-mono); font-size: .8rem; color: var(--cyan); letter-spacing: .1em; }
.step-tag { font-family: var(--font-mono); font-size: .64rem; letter-spacing: .1em; text-transform: uppercase; font-weight: 600; width: max-content; padding: .2rem .5rem; border-radius: 6px; }
.step-tag-eu { color: var(--cyan); background: rgba(34,211,238,.12); }
.step-tag-cr { color: var(--indigo); background: rgba(129,140,248,.12); }
.step-h { font-size: 1.18rem; font-weight: 650; color: var(--heading); margin-top: .15rem; }
.step-p { font-size: .9rem; color: var(--muted); line-height: 1.55; }
@media (max-width: 860px) { .steps { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .steps { grid-template-columns: 1fr; } }

/* ============================================================
   DPO
   ============================================================ */
.dpo { padding-block: clamp(3.5rem, 8vw, 6.5rem); background: var(--bg-2); border-block: 1px solid var(--line); }
.facts {
  margin-top: clamp(1.8rem, 4vw, 2.5rem);
  display: grid; gap: 1px; background: var(--line);
  border: 1px solid var(--line); border-radius: var(--r); overflow: hidden;
}
.fact { display: flex; gap: 1rem; align-items: flex-start; padding: 1.3rem clamp(1rem, 3vw, 1.8rem); background: var(--panel); }
.fact-no { font-family: var(--font-mono); color: var(--cyan); font-weight: 600; flex: none; }
.fact p { color: var(--text); max-width: 72ch; }
.dpo-note { margin-top: 1.5rem; font-size: .92rem; color: var(--faint); font-style: italic; }

/* ============================================================
   What we build
   ============================================================ */
.build { padding-block: clamp(3.5rem, 8vw, 6.5rem); }
.build-grid { display: grid; gap: clamp(1.5rem, 4vw, 2.5rem); }
.build-list { display: grid; gap: 1rem; grid-template-columns: repeat(3, 1fr); }
.build-list li { display: flex; flex-direction: column; gap: .3rem; padding: 1.4rem 1.3rem; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); }
.bl-h { font-size: 1.25rem; font-weight: 650; color: var(--heading); }
.bl-p { color: var(--muted); font-size: .93rem; }
.build-fit { border-left: 2px solid var(--cyan); padding: .4rem 0 .4rem 1.4rem; max-width: 64ch; }
.fit-h { font-family: var(--font-mono); font-weight: 600; color: var(--cyan); margin-bottom: .35rem; font-size: .9rem; }
.build-fit p:last-child { color: var(--muted); }
@media (max-width: 720px) { .build-list { grid-template-columns: 1fr; } }

/* ============================================================
   Engagement
   ============================================================ */
.engagement { padding-block: clamp(3.5rem, 8vw, 6.5rem); background: var(--bg-2); border-block: 1px solid var(--line); }
.eng-grid { display: grid; gap: clamp(1.8rem, 4vw, 2.5rem); }
.eng-cards { display: grid; gap: 1.2rem; grid-template-columns: 1fr 1fr; }
.eng-card { padding: clamp(1.5rem, 3vw, 2.2rem); border: 1px solid var(--line); border-radius: var(--r); background: var(--panel); }
.eng-card h3 { font-size: 1.45rem; font-weight: 650; margin: .35rem 0 .8rem; }
.eng-card p:last-child { color: var(--muted); }
.eng-tag { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; color: var(--cyan); }
@media (max-width: 700px) { .eng-cards { grid-template-columns: 1fr; } }

/* ============================================================
   About
   ============================================================ */
.about { padding-block: clamp(3.5rem, 8vw, 6.5rem); }
.about-inner { max-width: 52rem; }
.about-body { margin-top: 1.4rem; font-size: clamp(1.05rem, 1rem + 0.5vw, 1.28rem); color: var(--muted); line-height: 1.55; }
.about-cta { margin-top: 2rem; }

/* ============================================================
   Footer
   ============================================================ */
.site-footer { background: var(--bg-2); border-top: 1px solid var(--line); padding-top: clamp(2.5rem, 6vw, 4rem); color: var(--muted); }
.footer-inner { display: flex; flex-wrap: wrap; gap: 2rem; justify-content: space-between; padding-bottom: 2rem; border-bottom: 1px solid var(--line); }
.footer-brand .brand-name { color: var(--heading); font-size: 1.2rem; }
.footer-tag { margin-top: .4rem; font-size: .95rem; }
.footer-meta { display: grid; gap: .35rem; font-size: .95rem; align-content: start; font-family: var(--font-mono); }
.footer-meta a { color: var(--muted); }
.footer-meta a:hover { color: var(--cyan); }
.todo { color: var(--rose); }
.footer-fine { padding-block: 1.4rem; font-size: .82rem; color: var(--faint); font-family: var(--font-mono); }
.footer-fine a { color: var(--faint); }
.footer-fine a:hover { color: var(--cyan); }

/* ============================================================
   Privacy page
   ============================================================ */
.legal { padding-block: clamp(3rem, 7vw, 5rem); }
.legal-inner { max-width: 46rem; }
.legal h1 { font-size: clamp(2rem, 1.4rem + 2.5vw, 3rem); }
.legal h2 { font-size: 1.3rem; font-weight: 650; margin-top: 2.4rem; color: var(--heading); }
.legal p, .legal li { color: var(--muted); margin-top: .9rem; max-width: 68ch; }
.legal ul { list-style: disc; padding-left: 1.3rem; }
.legal li { margin-top: .5rem; }
.legal .updated { font-family: var(--font-mono); font-size: .85rem; color: var(--faint); margin-top: .6rem; }
.legal a.back { margin-top: 2.5rem; }

/* ============================================================
   Motion
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .001ms !important; animation-duration: .001ms !important; }
}