/* ============================================
   SCHEMA — Design System
   Aesthetic: post-industrial graphic, bone+rust palette,
   technical readouts, terminal interactions
   ============================================ */

:root {
  /* Palette — Marathon: cream paper, vivid orange, hi-vis lime, pure black */
  --bone: #f1ead6;          /* cream paper, slightly warmer */
  --bone-2: #e4dbc2;
  --paper: #f7f1de;
  --ink: #0a0a0a;           /* near-pure black */
  --ink-2: #1a1a1a;
  --ink-3: #5a5550;
  --rust: #d8ff2b;          /* hi-vis lime / chartreuse — primary accent */
  --rust-deep: #b8db1a;
  --amber: #ffb020;
  --signal: #ff5b1f;        /* vivid orange — secondary signal */
  --signal-dim: #c84512;
  --rule: rgba(10, 10, 10, 0.18);
  --rule-strong: rgba(10, 10, 10, 0.5);

  /* Type */
  --font-display: "Space Grotesk", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-body: "Space Grotesk", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, Menlo, monospace;

  /* Spacing */
  --gutter: 24px;
  --pad: 32px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--ink);
  color: var(--bone);
  font-family: var(--font-body);
  font-feature-settings: "ss01", "ss02", "tnum";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Subtle scanline texture across the whole page — terminal feel */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    rgba(241, 234, 214, 0.02) 0 1px,
    transparent 1px 3px
  );
  z-index: 9999;
}

a { color: inherit; text-decoration: none; }

/* ---------- Type scale ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(241, 234, 214, 0.55);
}
.eyebrow.rust { color: var(--rust); }

.h-mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.display-xl {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(72px, 11vw, 184px);
  line-height: 0.86;
  letter-spacing: -0.035em;
}

.display-l {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(48px, 6vw, 96px);
  line-height: 0.9;
  letter-spacing: -0.03em;
}

.display-m {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(28px, 3vw, 44px);
  line-height: 0.96;
  letter-spacing: -0.02em;
}

.body-l { font-size: 18px; line-height: 1.5; }
.body { font-size: 15px; line-height: 1.55; }
.body-s { font-size: 13px; line-height: 1.55; }

/* ---------- Frame chrome ---------- */
.shell {
  min-height: 100vh;
  padding: 18px;
  position: relative;
}

.frame {
  border: 1.5px solid var(--bone);
  background: var(--ink);
  position: relative;
}

.frame::before, .frame::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 1.5px solid var(--bone);
  background: var(--rust);
  z-index: 2;
}
.frame::before { top: -8px; left: -8px; }
.frame::after { bottom: -8px; right: -8px; }

/* Top utility bar — the technical readout strip */
.utility-bar {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  gap: 32px;
  align-items: center;
  padding: 10px 18px;
  border-bottom: 1.5px solid var(--bone);
  background: var(--ink);
  color: var(--bone);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.utility-bar .marks {
  display: flex;
  gap: 18px;
  color: rgba(241, 234, 214, 0.65);
}
.utility-bar .marks span { display: inline-flex; align-items: center; gap: 6px; }
.utility-bar .dot {
  width: 8px; height: 8px;
  background: var(--signal);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--signal);
  animation: pulse 2s ease-in-out infinite;
}
.utility-bar .dot.rust { background: var(--rust); box-shadow: 0 0 8px var(--rust); }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

/* Site header */
.site-header {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  padding: 22px 32px;
  border-bottom: 1.5px solid var(--bone);
  gap: 48px;
}
.site-header .logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -0.02em;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--bone);
}
.site-header .logo .glyph {
  width: 22px; height: 22px;
  background: var(--bone);
  position: relative;
}
.site-header .logo .glyph::after {
  content: "";
  position: absolute;
  inset: 5px;
  background: var(--rust);
}
.site-header nav {
  display: flex;
  gap: 28px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.site-header nav a {
  position: relative;
  padding: 4px 0;
  color: var(--bone);
  opacity: 0.6;
  transition: opacity 0.15s;
}
.site-header nav a:hover { opacity: 1; }
.site-header nav a.active { opacity: 1; }
.site-header nav a.active::after {
  content: "";
  position: absolute;
  inset: auto 0 -8px 0;
  height: 2px;
  background: var(--rust);
}

/* Nav dropdown */
.site-header nav .nav-item {
  position: relative;
  padding: 4px 0;
}
.site-header nav .nav-item::after {
  /* invisible bridge — keeps :hover alive across the gap to .dropdown */
  content: "";
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  height: 16px;
}
.site-header nav .nav-item > .trigger { cursor: pointer; }
.site-header nav .nav-item > .trigger {
  position: relative;
  padding: 4px 0;
  color: var(--bone);
  opacity: 0.6;
  transition: opacity 0.15s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.site-header nav .nav-item:hover > .trigger,
.site-header nav .nav-item.active > .trigger { opacity: 1; }
.site-header nav .nav-item.active > .trigger::after {
  content: "";
  position: absolute;
  inset: auto 12px -8px 0;
  height: 2px;
  background: var(--rust);
}
.site-header nav .nav-item > .trigger .caret {
  font-size: 9px;
  color: var(--rust);
  transition: transform 0.15s;
  display: inline-block;
}
.site-header nav .nav-item:hover > .trigger .caret { transform: rotate(180deg); }

.site-header nav .dropdown {
  position: absolute;
  top: 100%;
  left: -16px;
  margin-top: 8px;
  min-width: 280px;
  background: var(--ink);
  border: 1.5px solid var(--bone);
  padding: 6px;
  display: grid;
  gap: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 0.15s, transform 0.15s, visibility 0.15s;
  z-index: 50;
}
.site-header nav .dropdown::before {
  /* registration mark — top-left corner accent */
  content: "";
  position: absolute;
  top: -5px; left: -5px;
  width: 8px; height: 8px;
  background: var(--rust);
  border: 1.5px solid var(--bone);
}
.site-header nav .nav-item:hover > .dropdown,
.site-header nav .nav-item:focus-within > .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.site-header nav .dropdown a {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 12px 14px;
  border-bottom: 1px dashed rgba(241, 234, 214, 0.18);
  opacity: 0.85;
  transition: background 0.12s, opacity 0.12s;
}
.site-header nav .dropdown a:last-child { border-bottom: none; }
.site-header nav .dropdown a:hover {
  background: rgba(241, 234, 214, 0.05);
  opacity: 1;
}
.site-header nav .dropdown a::after { display: none; }
.site-header nav .dropdown a .id {
  color: var(--rust);
  font-weight: 600;
  font-size: 10px;
  letter-spacing: 0.14em;
}
.site-header nav .dropdown a .name {
  color: var(--bone);
  text-transform: none;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.01em;
}
.site-header nav .dropdown a .arrow {
  color: rgba(241, 234, 214, 0.4);
  font-family: var(--font-mono);
  font-size: 11px;
  transition: color 0.12s, transform 0.12s;
}
.site-header nav .dropdown a:hover .arrow {
  color: var(--rust);
  transform: translateX(3px);
}
.site-header .actions {
  display: flex; gap: 12px; align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border: 1.5px solid var(--bone);
  background: transparent;
  color: var(--bone);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, transform 0.05s;
}
.btn:hover { background: var(--bone); color: var(--ink); }
.btn:active { transform: translateY(1px); }
.btn.rust { background: var(--rust); color: var(--ink); border-color: var(--rust); }
.btn.rust:hover { background: var(--rust-deep); border-color: var(--rust-deep); color: var(--bone); }
.btn .arrow { font-family: var(--font-mono); }

/* Section headings */
.section-head {
  display: grid;
  grid-template-columns: 80px 1fr auto;
  gap: 24px;
  align-items: end;
  padding: 32px;
  border-bottom: 1.5px solid var(--bone);
}
.section-head .index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--rust);
}

/* ---------- Striped placeholder ---------- */
.stripe-placeholder {
  background:
    repeating-linear-gradient(
      135deg,
      rgba(241, 234, 214, 0.08) 0 14px,
      transparent 14px 28px
    );
  border: 1.5px solid var(--bone);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(241, 234, 214, 0.5);
  text-align: center;
  padding: 24px;
}
.stripe-placeholder.dark {
  background:
    repeating-linear-gradient(
      135deg,
      var(--ink-2) 0 14px,
      var(--ink) 14px 28px
    );
  color: var(--bone-2);
  border-color: var(--ink);
}
.stripe-placeholder.rust {
  background:
    repeating-linear-gradient(
      135deg,
      var(--rust-deep) 0 14px,
      var(--rust) 14px 28px
    );
  color: var(--bone);
  border-color: var(--ink);
}
.stripe-placeholder .label {
  background: var(--bone);
  border: 1.5px solid var(--ink);
  padding: 6px 10px;
  z-index: 1;
}
.stripe-placeholder.dark .label { background: var(--ink); color: var(--bone); }

/* Corner registration marks for big tiles */
.regmark { position: absolute; width: 18px; height: 18px; pointer-events: none; z-index: 2; }
.regmark.tl { top: 6px; left: 6px; border-top: 1.5px solid var(--bone); border-left: 1.5px solid var(--bone); }
.regmark.tr { top: 6px; right: 6px; border-top: 1.5px solid var(--bone); border-right: 1.5px solid var(--bone); }
.regmark.bl { bottom: 6px; left: 6px; border-bottom: 1.5px solid var(--bone); border-left: 1.5px solid var(--bone); }
.regmark.br { bottom: 6px; right: 6px; border-bottom: 1.5px solid var(--bone); border-right: 1.5px solid var(--bone); }

/* ---------- Terminal ---------- */
.terminal {
  background: var(--ink);
  color: var(--bone);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.55;
  position: relative;
  border: 1.5px solid var(--ink);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.terminal::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    rgba(255, 255, 255, 0.025) 0 1px,
    transparent 1px 3px
  );
  z-index: 1;
}
.terminal-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  border-bottom: 1px solid rgba(239, 233, 220, 0.18);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--bone-2);
  background: rgba(0, 0, 0, 0.35);
  position: relative;
  z-index: 2;
}
.terminal-bar .left, .terminal-bar .right { display: flex; gap: 14px; align-items: center; }
.terminal-bar .led {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--rust);
  box-shadow: 0 0 6px var(--rust);
  animation: pulse 1.6s ease-in-out infinite;
}
.terminal-body {
  flex: 1;
  padding: 18px 18px 8px;
  overflow-y: auto;
  position: relative;
  z-index: 2;
  scroll-behavior: smooth;
}
.terminal-body::-webkit-scrollbar { width: 8px; }
.terminal-body::-webkit-scrollbar-track { background: transparent; }
.terminal-body::-webkit-scrollbar-thumb { background: rgba(239, 233, 220, 0.18); }

.term-line { white-space: pre-wrap; }
.term-line .prompt { color: var(--rust); margin-right: 8px; }
.term-line .meta { color: var(--ink-3); color: rgba(239, 233, 220, 0.45); }
.term-line.system { color: var(--rust); }
.term-line.user { color: var(--bone); }
.term-line.user .prompt { color: var(--rust); }
.term-line.assistant { color: var(--bone); }
.term-line.assistant .prompt { color: var(--rust); }
.term-line.cite {
  color: rgba(239, 233, 220, 0.6);
  font-size: 11px;
  padding-left: 24px;
  border-left: 2px solid var(--rust);
  margin: 6px 0 6px 8px;
}
.term-line.error { color: var(--rust); }
.term-block { margin: 8px 0 14px; }
.term-block.assistant { padding-left: 4px; }

.cursor {
  display: inline-block;
  width: 9px;
  height: 14px;
  background: var(--rust);
  vertical-align: text-bottom;
  margin-left: 2px;
  animation: blink 1s steps(2) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.terminal-input {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 12px 14px;
  border-top: 1px solid rgba(239, 233, 220, 0.18);
  background: rgba(0, 0, 0, 0.45);
  position: relative;
  z-index: 2;
}
.terminal-input .prompt {
  color: var(--rust);
  font-family: var(--font-mono);
  font-size: 13px;
}
.terminal-input input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--bone);
  font-family: var(--font-mono);
  font-size: 13px;
  width: 100%;
  caret-color: var(--rust);
}
.terminal-input input::placeholder { color: rgba(239, 233, 220, 0.35); }
.terminal-input .send {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--rust);
  background: transparent;
  border: 1px solid rgba(216, 255, 43, 0.45);
  padding: 6px 10px;
  cursor: pointer;
  transition: background 0.15s;
}
.terminal-input .send:hover { background: rgba(216, 255, 43, 0.15); }
.terminal-input .send:disabled { opacity: 0.4; cursor: not-allowed; }

.suggested {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0 14px 10px;
  position: relative;
  z-index: 2;
  background: rgba(0, 0, 0, 0.25);
}
.suggested-chip {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 5px 9px;
  border: 1px solid rgba(239, 233, 220, 0.25);
  color: var(--bone-2);
  background: transparent;
  cursor: pointer;
  transition: all 0.15s;
}
.suggested-chip:hover {
  border-color: var(--rust);
  color: var(--rust);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1.5px solid var(--bone);
  padding: 32px;
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 32px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(241, 234, 214, 0.55);
  align-items: end;
}
.site-footer .colophon { display: grid; gap: 4px; }
.site-footer .big-mark {
  font-family: var(--font-display);
  font-size: 96px;
  font-weight: 700;
  line-height: 0.85;
  color: var(--rust);
  letter-spacing: -0.03em;
}

/* ---------- Helpers ---------- */
.row { display: flex; }
.col { display: flex; flex-direction: column; }
.gap-8 { gap: 8px; }
.gap-16 { gap: 16px; }
.gap-24 { gap: 24px; }
.gap-32 { gap: 32px; }
.flex-1 { flex: 1; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 4px 8px;
  border: 1px solid var(--bone);
  background: transparent;
  color: var(--bone);
}
.tag.rust { background: var(--rust); color: var(--ink); border-color: var(--rust); }
.tag.ink { background: var(--ink); color: var(--bone); border-color: var(--bone); }

/* horizontal rule with cap */
hr.rule {
  border: 0;
  border-top: 1.5px solid var(--bone);
  margin: 0;
}

/* technical micro chart strip */
.readout {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 2px;
  height: 20px;
}
.readout span { background: var(--bone); }
.readout span:nth-child(odd) { background: var(--rust); }
.readout span:nth-child(3n) { background: transparent; border: 1px solid var(--bone); }

/* halftone dot wash — used as accent backgrounds */
.halftone {
  background-image: radial-gradient(var(--bone) 1px, transparent 1.4px);
  background-size: 8px 8px;
}
.halftone.rust { background-image: radial-gradient(var(--rust) 1px, transparent 1.4px); }