/* ============================================================
   BUILD ROOM — Shared Brand System
   Imported by: index.html, thank-you.html, build-room.html,
                ship-loop.html, ship-and-sell.html
   Reference: BRANDING doc v1
   ============================================================ */

/* ---------- RESET ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body { min-height: 100vh; line-height: 1.6; }
img, picture, svg { max-width: 100%; display: block; }
input, button, textarea, select { font: inherit; color: inherit; }
button { background: none; border: none; cursor: pointer; }
a { color: inherit; text-decoration: none; }

/* ---------- BRAND TOKENS ---------- */
:root {
  /* Primary */
  --paper: #F7F5F0;
  --paper-tape: #EFEDE6;
  --graphite: #1A1A1C;
  --ink: #0E0E10;
  --chalk: #EDEBE5;
  --pencil: #6B6B6E;
  --pencil-light: #A3A2A0;

  /* Accent */
  --signal: #FF5B1F;
  --signal-deep: #E04A15;
  --signal-tint: #FFE4D6;

  /* Status */
  --shipped: #3F9B6F;
  --stuck: #D4A84B;
  --kill: #C44536;

  /* Fonts */
  --font-display: 'Inter Tight', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Menlo, monospace;

  /* Spacing scale */
  --s-1: 0.25rem;
  --s-2: 0.5rem;
  --s-3: 0.75rem;
  --s-4: 1rem;
  --s-5: 1.5rem;
  --s-6: 2rem;
  --s-7: 3rem;
  --s-8: 4rem;
  --s-9: 6rem;
  --s-10: 8rem;

  /* Layout */
  --max-w: 1120px;
  --max-w-narrow: 680px;
  --max-w-reading: 580px;
}

/* ---------- BASE TYPOGRAPHY ---------- */
body {
  font-family: var(--font-body);
  font-size: 16px;
  color: var(--graphite);
  background: var(--paper);
  font-weight: 400;
}

body.dark {
  background: var(--ink);
  color: var(--chalk);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 0.98;
  letter-spacing: -0.035em;
  color: var(--graphite);
}

body.dark h1, body.dark h2, body.dark h3, body.dark h4 { color: var(--chalk); }

h1 {
  font-size: clamp(2.75rem, 6vw + 1rem, 5.5rem);
  letter-spacing: -0.04em;
  line-height: 0.92;
}

h2 {
  font-size: clamp(2rem, 3vw + 1rem, 3rem);
  letter-spacing: -0.025em;
  line-height: 1.02;
  font-weight: 700;
}

h3 {
  font-size: 1.375rem;
  letter-spacing: -0.015em;
  line-height: 1.25;
  font-weight: 600;
}

h4 {
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

p { font-size: 1rem; line-height: 1.6; }
.lede { font-size: 1.1875rem; line-height: 1.55; color: var(--graphite); }
body.dark .lede { color: var(--chalk); }

/* ---------- MONO ---------- */
.mono {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.75rem;
  color: var(--pencil);
}

body.dark .mono { color: var(--pencil-light); }

.mono-label {
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.6875rem;
  color: var(--pencil);
}

body.dark .mono-label { color: var(--pencil-light); }

.mono-body {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--pencil);
}

body.dark .mono-body { color: var(--pencil-light); }

/* ---------- LAYOUT ---------- */
.wrap {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding-left: var(--s-5);
  padding-right: var(--s-5);
}

.wrap-narrow {
  width: 100%;
  max-width: var(--max-w-narrow);
  margin: 0 auto;
  padding-left: var(--s-5);
  padding-right: var(--s-5);
}

.reading {
  max-width: var(--max-w-reading);
}

section { padding: var(--s-8) 0; }

@media (max-width: 640px) {
  section { padding: var(--s-6) 0; }
  .wrap, .wrap-narrow { padding-left: var(--s-4); padding-right: var(--s-4); }
}

/* ---------- LOGO ---------- */
.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
}

.logo-mark {
  display: inline-block;
  width: 12px;
  height: 12px;
  background: var(--signal);
}

.logo-text {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.12em;
  font-size: 0.8125rem;
  text-transform: uppercase;
  color: var(--graphite);
}

body.dark .logo-text { color: var(--chalk); }

/* ---------- HEADER ---------- */
header.nav {
  padding: var(--s-5) 0;
  border-bottom: 1px solid transparent;
}

header.nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

header.nav .nav-right {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--pencil);
}

body.dark header.nav .nav-right { color: var(--pencil-light); }

/* ---------- CTA ---------- */
.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-3);
  padding: var(--s-4) var(--s-6);
  background: var(--signal);
  color: white;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: background 0.15s ease, transform 0.1s ease;
  cursor: pointer;
  border: none;
  text-align: center;
}

.cta:hover { background: var(--signal-deep); }
.cta:active { transform: translateY(1px); }
.cta .arrow { transition: transform 0.15s ease; font-size: 1rem; }
.cta:hover .arrow { transform: translateX(3px); }

.cta-ghost {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: var(--s-3) var(--s-5);
  background: transparent;
  color: var(--graphite);
  border: 1px solid var(--graphite);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: background 0.15s ease;
}

body.dark .cta-ghost { color: var(--chalk); border-color: var(--chalk); }
.cta-ghost:hover { background: var(--graphite); color: var(--paper); }
body.dark .cta-ghost:hover { background: var(--chalk); color: var(--ink); }

/* ---------- NUMBERED STAGE LABELS ---------- */
.stage-strip {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--pencil);
}

body.dark .stage-strip { color: var(--pencil-light); }

.stage-strip .arrow {
  color: var(--signal);
  font-weight: 600;
}

.stage-strip .stage {
  white-space: nowrap;
}

.stage-strip .stage strong {
  color: var(--graphite);
  font-weight: 600;
}

body.dark .stage-strip .stage strong { color: var(--chalk); }

/* ---------- SIGNAL HIGHLIGHT (one per viewport) ---------- */
.signal-word {
  color: var(--signal);
}

/* ---------- FOOTER ---------- */
footer.site-footer {
  padding: var(--s-8) 0 var(--s-6);
  border-top: 1px solid var(--paper-tape);
}

body.dark footer.site-footer { border-top-color: #1A1A1C; }

footer.site-footer .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--s-4);
}

.version-stamp {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--pencil);
}

body.dark .version-stamp { color: var(--pencil-light); }

.version-stamp .dot {
  color: var(--signal);
  margin: 0 var(--s-2);
}

/* ---------- TERMINAL FRAME (for dark content on Paper) ---------- */
.terminal {
  background: var(--ink);
  border-radius: 6px;
  padding: var(--s-4) var(--s-5) var(--s-5);
  box-shadow: 0 1px 0 rgba(0,0,0,0.04);
}

.terminal-head {
  display: flex;
  align-items: center;
  gap: var(--s-2);
  padding-bottom: var(--s-4);
  border-bottom: 1px solid #2A2A2C;
  margin-bottom: var(--s-4);
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #2A2A2C;
}

.terminal-title {
  margin-left: var(--s-3);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--pencil-light);
}

.terminal-body {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--chalk);
}

.terminal-body .prompt { color: var(--signal); }
.terminal-body .dim { color: var(--pencil); }
.terminal-body .line { display: block; }

/* ---------- CARD ---------- */
.card {
  background: var(--paper-tape);
  padding: var(--s-6);
  border: 1px solid transparent;
}

body.dark .card { background: #17171A; }

/* ---------- FORM ---------- */
.form-row {
  display: flex;
  gap: var(--s-3);
  margin-top: var(--s-5);
}

.form-row input[type="email"],
.form-row input[type="text"] {
  flex: 1;
  padding: var(--s-4) var(--s-5);
  background: var(--paper-tape);
  border: 1px solid var(--pencil-light);
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--graphite);
  transition: border-color 0.15s ease;
}

body.dark .form-row input[type="email"],
body.dark .form-row input[type="text"] {
  background: #17171A;
  border-color: #2A2A2C;
  color: var(--chalk);
}

.form-row input:focus {
  outline: none;
  border-color: var(--signal);
}

.form-row input::placeholder {
  color: var(--pencil-light);
}

@media (max-width: 520px) {
  .form-row { flex-direction: column; }
  .cta { width: 100%; }
}

/* ---------- UTILS ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal);
  font-weight: 600;
  margin-bottom: var(--s-4);
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--signal);
}

.divider {
  height: 1px;
  background: var(--paper-tape);
  margin: var(--s-7) 0;
  border: none;
}

body.dark .divider { background: #2A2A2C; }

.dim { color: var(--pencil); }
body.dark .dim { color: var(--pencil-light); }

.strike-through {
  text-decoration: line-through;
  text-decoration-color: var(--pencil-light);
  text-decoration-thickness: 2px;
}

/* ---------- LISTS ---------- */
.check-list {
  list-style: none;
  display: grid;
  gap: var(--s-4);
}

.check-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--s-4);
  align-items: start;
}

.check-list li::before {
  content: "→";
  color: var(--signal);
  font-family: var(--font-mono);
  font-weight: 600;
  line-height: 1.6;
}

/* ---------- FAQ ---------- */
.faq-item {
  padding: var(--s-5) 0;
  border-bottom: 1px solid var(--paper-tape);
}

body.dark .faq-item { border-bottom-color: #2A2A2C; }

.faq-item summary {
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: 1.0625rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--s-4);
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "+";
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 500;
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after { content: "−"; }

.faq-answer {
  margin-top: var(--s-4);
  color: var(--pencil);
  line-height: 1.65;
}

body.dark .faq-answer { color: var(--pencil-light); }

/* ---------- RECEIPTS NOTE ---------- */
.receipts-caption {
  margin-top: var(--s-4);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--pencil);
  font-style: italic;
}

body.dark .receipts-caption { color: var(--pencil-light); }

/* ---------- RESPONSIVE UTILS ---------- */
@media (max-width: 640px) {
  h1 { font-size: clamp(2.25rem, 8vw, 3rem); }
  h2 { font-size: clamp(1.625rem, 5vw, 2.25rem); }
}

/* ---------- FOCUS ---------- */
:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

/* ---------- SELECTION ---------- */
::selection {
  background: var(--signal);
  color: white;
}