/* Engineering Guild — institutional site
   Tokens mirror packages/design-tokens + docs/guild/design-system/01_FOUNDATIONS.md
   Skin: institutional (light) majority, engineering (dark) hero/footer — allowed by 02_SKINS §Regras */

:root {
  /* brand */
  --brand-green: #0AD92A;
  --brand-green-deep: #0B8F22;
  --cyan: #19C2D6;
  --gold: #E8B04B;
  --blue: #2563EB;
  --uranium: #B6E300;

  /* state (GOX) — never use brand green to mean "success" */
  --success: #16A34A;
  --warning: #FFB800;
  --danger: #FF4466;
  --info: #19C2D6;

  /* institutional skin (light) */
  --bg: #FFFFFF;
  --surface-1: #F6F8F7;
  --surface-2: #EDF1EF;
  --card: #FFFFFF;
  --fg: #0E1512;
  --fg-muted: #46524C;
  --fg-subtle: #6C7A73;
  --border: #DCE4E0;
  --accent: var(--brand-green-deep);

  /* engineering skin (dark) — applied per-section */
  --d-bg: #0A0F0C;
  --d-surface: #111815;
  --d-fg: #EAF2EE;
  --d-fg-muted: #9FB0A8;
  --d-border: #1E2A24;

  /* type */
  --font-display: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  --font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-signature: "Great Vibes", cursive;

  /* space & radius — 4px scale, base radius 12px */
  --r-sm: 6px;
  --r: 12px;
  --r-lg: 16px;
  --wrap: 1120px;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; }
a { color: inherit; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

h1, h2, h3 { font-family: var(--font-display); line-height: 1.15; letter-spacing: -0.02em; margin: 0; }
h1 { font-size: clamp(2.2rem, 6vw, 4rem); font-weight: 700; }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.4rem); font-weight: 600; }
h3 { font-size: 1.12rem; font-weight: 600; letter-spacing: -0.01em; }
p { margin: 0 0 1rem; }

.kicker {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-subtle);
  margin-bottom: 14px;
}

section { padding: 88px 0; border-bottom: 1px solid var(--border); }
section.alt { background: var(--surface-1); }
.lead { font-size: 1.18rem; color: var(--fg-muted); max-width: 62ch; }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10, 15, 12, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--d-border);
}
.nav .wrap { display: flex; align-items: center; gap: 28px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; margin-right: auto; }
.brand svg { width: 30px; height: 30px; display: block; }
.brand span {
  font-family: var(--font-display); font-weight: 600; font-size: 1.02rem;
  color: var(--d-fg); letter-spacing: -0.01em;
}
.nav a.link {
  color: var(--d-fg-muted); text-decoration: none; font-size: 0.92rem;
  transition: color 160ms ease-out;
}
.nav a.link:hover { color: var(--brand-green); }
@media (max-width: 720px) { .nav a.link { display: none; } .nav a.link.keep { display: inline; } }

/* ---------- hero (engineering skin) ---------- */
.hero {
  background: var(--d-bg);
  color: var(--d-fg);
  border-bottom: 1px solid var(--d-border);
  padding: 108px 0 96px;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(680px 380px at 78% 18%, rgba(10, 217, 42, 0.13), transparent 68%),
    linear-gradient(transparent 96%, rgba(255,255,255,0.035) 96%) 0 0 / 100% 34px;
  pointer-events: none;
}
.hero .wrap { position: relative; z-index: 1; }
.hero .kicker { color: var(--brand-green); }
.hero h1 { max-width: 17ch; }
.hero h1 em { font-style: normal; color: var(--brand-green); }
.hero .lead { color: var(--d-fg-muted); margin-top: 22px; font-size: 1.22rem; }
.hero-mark {
  position: absolute; right: -60px; top: 50%; transform: translateY(-50%);
  width: 460px; opacity: 0.09; z-index: 0;
}
@media (max-width: 900px) { .hero-mark { display: none; } }

.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.btn {
  display: inline-block; padding: 13px 24px; border-radius: var(--r);
  font-weight: 600; font-size: 0.98rem; text-decoration: none;
  border: 1px solid transparent; transition: transform 160ms ease-out, background 160ms ease-out;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--brand-green); color: #06210C; }
.btn-primary:hover { background: #14EC38; }
.btn-ghost { border-color: var(--d-border); color: var(--d-fg); }
.btn-ghost:hover { border-color: var(--brand-green); color: var(--brand-green); }

.facts { display: flex; flex-wrap: wrap; gap: 10px 28px; margin-top: 40px; }
.facts span {
  font-family: var(--font-mono); font-size: 0.76rem; letter-spacing: 0.06em;
  color: var(--d-fg-muted);
}
.facts span b { color: var(--brand-green); font-weight: 500; }

/* ---------- ladder ---------- */
.ladder { display: grid; gap: 18px; grid-template-columns: repeat(4, 1fr); margin-top: 44px; }
@media (max-width: 900px) { .ladder { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .ladder { grid-template-columns: 1fr; } }
.step {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--r); padding: 22px; position: relative;
}
.step .num {
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.14em;
  color: var(--accent); display: block; margin-bottom: 10px;
}
.step h3 { margin-bottom: 6px; }
.step p { color: var(--fg-muted); font-size: 0.95rem; margin: 0; }

/* ---------- portfolio ---------- */
.group-title {
  font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--fg-subtle);
  margin: 44px 0 16px; padding-bottom: 10px; border-bottom: 1px solid var(--border);
}
.grid { display: grid; gap: 16px; grid-template-columns: repeat(3, 1fr); }
@media (max-width: 920px) { .grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 620px) { .grid { grid-template-columns: 1fr; } }

.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--r);
  padding: 20px; display: flex; flex-direction: column; gap: 8px;
  transition: border-color 160ms ease-out, transform 160ms ease-out;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card .id {
  font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.12em;
  color: var(--fg-subtle);
}
.card p { color: var(--fg-muted); font-size: 0.93rem; margin: 0; flex: 1; }
.card a.more {
  font-size: 0.86rem; font-weight: 600; color: var(--accent);
  text-decoration: none; margin-top: 4px;
}
.card a.more:hover { text-decoration: underline; }

.chip {
  align-self: flex-start; font-family: var(--font-mono);
  font-size: 0.64rem; letter-spacing: 0.1em; text-transform: uppercase;
  padding: 3px 9px; border-radius: 999px; border: 1px solid var(--border);
  color: var(--fg-subtle); background: var(--surface-1);
}
.chip.live { color: #0B6B2B; border-color: #A8E0B8; background: #EAF9EF; }
.chip.active { color: #0E5A66; border-color: #A9DDE4; background: #E8F7F9; }
.chip.research { color: #6B4E00; border-color: #E9D79A; background: #FBF4E0; }
.chip.planning { color: #3B5BA5; border-color: #B9C9EA; background: #EDF2FC; }
.chip.gated { color: #9A3412; border-color: #F3C89A; background: #FDF1E4; }
.chip.frozen { color: #475569; border-color: #CBD5E1; background: #F1F5F9; }
.chip.archived { color: #6B7280; border-color: #D1D5DB; background: #F3F4F6; opacity: 0.85; }

/* ---------- method ---------- */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
@media (max-width: 860px) { .two-col { grid-template-columns: 1fr; gap: 32px; } }

/* ---------- project page (value prop) ---------- */
.three-col { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; align-items: start; margin-top: 24px; }
@media (max-width: 860px) { .three-col { grid-template-columns: 1fr; gap: 24px; } }
.three-col h3 { margin-bottom: 8px; }
.three-col .lead { font-size: 1rem; }
.rule-list { list-style: none; padding: 0; margin: 24px 0 0; }
.rule-list li {
  padding: 14px 0 14px 30px; border-top: 1px solid var(--border);
  position: relative; color: var(--fg-muted); font-size: 0.97rem;
}
.rule-list li::before {
  content: ""; position: absolute; left: 4px; top: 22px;
  width: 8px; height: 8px; background: var(--accent); border-radius: 2px;
  transform: rotate(45deg);
}
.rule-list li b { color: var(--fg); font-weight: 600; }

/* ---------- papers ---------- */
.paper-row {
  display: flex; gap: 18px; align-items: baseline; padding: 18px 0;
  border-top: 1px solid var(--border); text-decoration: none;
}
.paper-row:last-of-type { border-bottom: 1px solid var(--border); }
.paper-row .pname { font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; min-width: 190px; }
.paper-row .pdesc { color: var(--fg-muted); font-size: 0.95rem; flex: 1; }

/* ---------- footer ---------- */
.footer {
  background: var(--d-bg); color: var(--d-fg-muted);
  padding: 64px 0 40px; border: 0; font-size: 0.92rem;
}
.footer .cols { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; }
@media (max-width: 760px) { .footer .cols { grid-template-columns: 1fr; gap: 28px; } }
.footer h4 {
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--d-fg); margin: 0 0 14px; font-weight: 500;
}
.footer a { color: var(--d-fg-muted); text-decoration: none; display: block; padding: 4px 0; }
.footer a:hover { color: var(--brand-green); }
.colophon {
  margin-top: 48px; padding-top: 26px; border-top: 1px solid var(--d-border);
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
}
.colophon .seal { width: 26px; height: 26px; opacity: 0.55; }
.colophon .sig {
  font-family: var(--font-signature); font-size: 1.5rem; color: var(--d-fg);
  opacity: 0.75; line-height: 1;
}
.colophon .small { font-size: 0.8rem; opacity: 0.7; margin-left: auto; }

/* ---------- papers page ---------- */
.page-head { background: var(--d-bg); color: var(--d-fg); padding: 76px 0 64px; }
.page-head .lead { color: var(--d-fg-muted); }
.note {
  background: var(--surface-2); border-left: 3px solid var(--accent);
  padding: 16px 20px; border-radius: 0 var(--r-sm) var(--r-sm) 0;
  color: var(--fg-muted); font-size: 0.95rem; margin: 28px 0 0;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto; }
  .btn:hover, .card:hover { transform: none; }
}