/* MNEOS.ai Rev 1 — Design system
 * Spec section 20: ambitious, scientific, institutional, technical, human, physically grounded, calm, serious.
 * Palette: deep graphite background, warm off-white text, restrained electric blue accent,
 * secondary mineral/titanium/copper tones, occasional signal green for verified/evidence.
 */

:root {
  /* Palette */
  --bg:            #0B0D0F;   /* deep graphite */
  --bg-elev:      #12151A;    /* elevated surfaces */
  --bg-card:      #171A20;    /* cards */
  --border:        #232830;   /* subtle border */
  --border-strong: #313842;

  --ink:           #F3EFE7;   /* warm off-white primary text */
  --ink-dim:      #B6ADA0;    /* secondary text */
  --ink-faint:     #7B7367;   /* tertiary text */

  --accent:        #4A7DFF;   /* restrained electric blue */
  --accent-dim:    #2E4EA6;   /* accent hover / muted */
  --accent-ghost:  rgba(74, 125, 255, 0.10);

  --copper:        #B9724A;   /* mineral / copper */
  --titanium:      #A5A9AE;   /* mineral / titanium */
  --ceramic:       #D6CFC0;   /* ceramic warm neutral */
  --signal:        #6FCF97;   /* signal green — verified / evidence */

  --danger:        #C15C5C;

  /* Typography */
  --font-display: "Space Grotesk", "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-body:    "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  /* Scale */
  --step-0: 0.9375rem;   /* 15px */
  --step-1: 1.0625rem;   /* 17px */
  --step-2: 1.25rem;
  --step-3: 1.5rem;
  --step-4: 2rem;
  --step-5: 2.75rem;
  --step-6: 3.75rem;
  --step-7: 5rem;

  /* Layout */
  --container: 1160px;
  --gutter: 24px;
  --radius: 4px;
  --radius-lg: 8px;

  --lead: 1.65;
  --lead-tight: 1.35;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-1);
  line-height: var(--lead);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01","cv11","liga";
}

/* Selection */
::selection { background: var(--accent); color: var(--bg); }

/* Links */
a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color 0.15s ease, color 0.15s ease; }
a:hover, a:focus { color: var(--ink); border-bottom-color: var(--accent); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* Typography */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: var(--lead-tight);
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0 0 0.6em;
}
h1 { font-size: clamp(var(--step-4), 4.6vw, var(--step-6)); font-weight: 500; letter-spacing: -0.025em; }
h2 { font-size: clamp(var(--step-3), 3.2vw, var(--step-5)); letter-spacing: -0.02em; }
h3 { font-size: clamp(var(--step-2), 2vw, var(--step-3)); }
h4 { font-size: var(--step-2); }

p { margin: 0 0 1em; }
ul, ol { padding-left: 1.2em; margin: 0 0 1em; }
li { margin-bottom: 0.35em; }

blockquote {
  margin: 0;
  padding: 8px 0 8px 20px;
  border-left: 2px solid var(--accent);
  font-style: normal;
  color: var(--ink);
}

/* Utilities */
.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); }
.mono { font-family: var(--font-mono); font-size: 0.85em; letter-spacing: 0.02em; color: var(--ink-dim); }
.muted { color: var(--ink-dim); }
.faint { color: var(--ink-faint); }
.small { font-size: 0.875rem; }
.tight { line-height: 1.4; }
.stack > * + * { margin-top: 1em; }
.stack-lg > * + * { margin-top: 2em; }
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 0.5em; }
.mt-2 { margin-top: 1em; }
.mt-3 { margin-top: 1.5em; }
.mt-4 { margin-top: 2em; }
.mt-5 { margin-top: 3em; }

/* Section labels */
.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 4px 10px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  margin-bottom: 18px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 14px;
}

/* Layout: hero */
main { padding-bottom: 80px; }
section { padding: 84px 0; }
section + section { border-top: 1px solid var(--border); }
.section-narrow > .container > * { max-width: 780px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: rgba(11,13,15,0.85);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 14px; padding-bottom: 14px;
  min-height: 60px;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--ink); font-family: var(--font-display); font-weight: 500; font-size: 1.05rem;
  letter-spacing: 0.01em; border: 0;
}
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: 6px;
  background: var(--accent);
  color: var(--bg); font-weight: 700; font-size: 0.85rem;
  font-family: var(--font-mono);
}
.brand span:last-child { font-family: var(--font-display); font-weight: 500; }
.nav-links { display: flex; gap: 22px; flex-wrap: wrap; }
.nav-links a {
  color: var(--ink-dim); font-size: 0.9rem;
  border-bottom: 0; padding: 4px 0;
  transition: color 0.15s ease;
}
.nav-links a:hover, .nav-links a.active { color: var(--ink); }
.nav-links a.active { color: var(--accent); }

/* Mobile nav */
.nav-toggle { display: none; background: none; border: 1px solid var(--border-strong); color: var(--ink); padding: 6px 10px; border-radius: 4px; font-family: var(--font-mono); font-size: 0.75rem; cursor: pointer; }
@media (max-width: 900px) {
  .nav-toggle { display: inline-block; }
  .nav-links { display: none; position: absolute; top: 100%; left: 0; right: 0; background: var(--bg-elev); padding: 20px var(--gutter); flex-direction: column; gap: 14px; border-bottom: 1px solid var(--border); }
  .nav-links.open { display: flex; }
  .site-header { position: relative; }
}

/* Hero */
.hero { padding: 120px 0 100px; }
.hero .container { max-width: 980px; }
.hero h1 { max-width: 900px; }
.hero .lede { font-size: clamp(var(--step-1), 1.5vw, var(--step-2)); color: var(--ink-dim); max-width: 720px; margin-top: 24px; line-height: 1.55; }
.hero-brand-line {
  display: inline-block; margin-top: 34px;
  font-family: var(--font-mono); font-size: 0.85rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--copper);
}
.hero-actions { display: flex; gap: 14px; margin-top: 36px; flex-wrap: wrap; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 24px; border-radius: 4px;
  font-family: var(--font-body); font-weight: 500; font-size: 0.95rem;
  border: 1px solid transparent; cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  text-decoration: none;
}
.btn:hover, .btn:focus { border-bottom: 1px solid transparent; }
.btn-primary { background: var(--accent); color: var(--bg); border-color: var(--accent); }
.btn-primary:hover { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn-secondary { background: transparent; color: var(--ink); border-color: var(--border-strong); }
.btn-secondary:hover { background: var(--bg-card); color: var(--ink); border-color: var(--accent); }
.btn-ghost { background: transparent; color: var(--accent); border-color: transparent; padding-left: 0; }
.btn-ghost:hover { color: var(--ink); }

/* Cards / grids */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px 26px 24px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.card:hover { border-color: var(--border-strong); }
.card h3 { margin-top: 4px; }
.card p:last-child { margin-bottom: 0; }
.card .role {
  display: inline-block;
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 12px;
}

.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}
@media (min-width: 700px) and (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

/* Chip / tag lists */
.chip-grid {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-wrap: wrap; gap: 10px;
}
.chip-grid li {
  font-family: var(--font-mono); font-size: 0.82rem;
  padding: 8px 14px;
  background: var(--bg-elev);
  color: var(--ink-dim);
  border: 1px solid var(--border);
  border-radius: 999px;
  margin: 0;
  letter-spacing: 0.01em;
}

/* Stats */
.stats { display: grid; grid-template-columns: repeat(auto-fit,minmax(180px,1fr)); gap: 32px; margin-top: 32px; }
.stat .n { font-family: var(--font-display); font-size: clamp(2rem, 4vw, 3rem); color: var(--ink); font-weight: 500; line-height: 1; letter-spacing: -0.02em; }
.stat .l { font-family: var(--font-mono); font-size: 0.75rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-dim); margin-top: 8px; }

/* Doctrine callout */
.doctrine {
  padding: 22px 26px;
  background: var(--accent-ghost);
  border-left: 2px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-family: var(--font-mono); font-size: 0.9rem;
  color: var(--ink); line-height: 1.7;
  letter-spacing: 0.01em;
}
.doctrine strong { color: var(--accent); display: block; font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 6px; font-family: var(--font-mono); }

/* Diagrams */
.diagram-wrap { margin: 40px 0; padding: 32px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow-x: auto; }
.diagram-wrap svg { display: block; margin: 0 auto; max-width: 100%; height: auto; }
.diagram-caption { font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.06em; color: var(--ink-faint); text-align: center; margin-top: 16px; }

/* Loop stages */
.loop-stages { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-top: 32px; counter-reset: stage; }
.loop-stage {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 20px; position: relative;
}
.loop-stage::before {
  counter-increment: stage;
  content: "0" counter(stage);
  font-family: var(--font-mono); color: var(--accent); font-size: 0.78rem; letter-spacing: 0.12em;
}
.loop-stage h4 { margin: 6px 0 8px; font-size: 1.1rem; }
.loop-stage p { color: var(--ink-dim); font-size: 0.9rem; line-height: 1.55; margin: 0; }

/* Status labels (internal doctrine, but occasional public use) */
.status { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; padding: 3px 8px; border-radius: 3px; border: 1px solid; }
.status-current { color: var(--signal); border-color: rgba(111,207,151,0.35); }
.status-development { color: var(--copper); border-color: rgba(185,114,74,0.35); }
.status-planned { color: var(--titanium); border-color: rgba(165,169,174,0.35); }
.status-vision { color: var(--ink-faint); border-color: var(--border); }

/* Forms */
.form { max-width: 720px; }
.form fieldset { border: 0; padding: 0; margin: 0 0 24px; }
.form legend {
  font-family: var(--font-mono); font-size: 0.75rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-dim); margin-bottom: 14px;
}
.form label { display: block; margin-bottom: 6px; font-size: 0.88rem; color: var(--ink); }
.form label .req { color: var(--copper); margin-left: 2px; }
.form input[type="text"],
.form input[type="email"],
.form input[type="tel"],
.form input[type="url"],
.form select,
.form textarea {
  width: 100%; padding: 12px 14px;
  background: var(--bg-elev); color: var(--ink);
  border: 1px solid var(--border-strong); border-radius: var(--radius);
  font-family: var(--font-body); font-size: 0.95rem; line-height: 1.5;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.form input:focus, .form select:focus, .form textarea:focus {
  outline: none; border-color: var(--accent); background: var(--bg);
}
.form textarea { min-height: 120px; resize: vertical; }
.form-row { margin-bottom: 18px; }
.form-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 640px) { .form-grid-2 { grid-template-columns: 1fr; } }
.form-help { font-size: 0.82rem; color: var(--ink-faint); margin-top: 4px; }
.form input[type="file"] { color: var(--ink-dim); font-size: 0.88rem; padding: 10px 0; }
.form input[type="checkbox"] { margin-right: 8px; vertical-align: middle; accent-color: var(--accent); }
.checkbox-row { display: flex; gap: 10px; align-items: flex-start; font-size: 0.9rem; color: var(--ink-dim); line-height: 1.5; }
.form-status { padding: 14px 18px; border-radius: var(--radius); margin-top: 16px; font-size: 0.9rem; display: none; }
.form-status.ok { display: block; background: rgba(111,207,151,0.10); border: 1px solid rgba(111,207,151,0.35); color: var(--signal); }
.form-status.err { display: block; background: rgba(193,92,92,0.10); border: 1px solid rgba(193,92,92,0.35); color: var(--danger); }

/* Notice boxes */
.notice {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-left: 3px solid var(--copper);
  padding: 18px 22px;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.88rem; color: var(--ink-dim); line-height: 1.65;
  margin: 24px 0;
}
.notice-strong { border-left-color: var(--danger); background: rgba(193,92,92,0.05); color: var(--ink); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 56px 0 40px;
  color: var(--ink-dim);
  font-size: 0.88rem;
}
.site-footer .container { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 32px; }
@media (max-width: 900px) { .site-footer .container { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .site-footer .container { grid-template-columns: 1fr; } }
.site-footer h4 { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-faint); margin: 0 0 14px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 8px; }
.site-footer a { color: var(--ink-dim); border: 0; }
.site-footer a:hover { color: var(--ink); }
.site-footer .brand-line { font-family: var(--font-mono); font-size: 0.75rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--copper); margin-top: 24px; }
.footer-legal { grid-column: 1 / -1; padding-top: 24px; border-top: 1px solid var(--border); color: var(--ink-faint); font-size: 0.78rem; line-height: 1.6; margin-top: 16px; }

/* Prose */
.prose { max-width: 760px; }
.prose p, .prose ul, .prose ol { color: var(--ink); }
.prose strong { color: var(--ink); }
.prose ul li::marker { color: var(--accent); }

/* Divider */
.divider { height: 1px; background: var(--border); margin: 48px 0; border: 0; }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* === Mobile readability fix — 2026-07-11 === */
html, body { overflow-x: hidden; }
.diagram-wrap { max-width: 100%; box-sizing: border-box; }
.diagram-wrap svg { max-width: 100%; height: auto; }
.arch-mobile { display: none; }
@media (max-width: 760px) {
  section, .container { padding-left: 16px !important; padding-right: 16px !important; box-sizing: border-box; }
  img, svg, pre, table { max-width: 100%; height: auto; }
  .diagram-wrap { padding: 16px !important; overflow: hidden; }
  .diagram-wrap svg.arch-svg { display: none !important; }
  .diagram-wrap svg { min-width: 0 !important; }
  .arch-mobile { display: block; }
  .arch-mobile ul.arch-mobile-stack { list-style: none !important; padding: 0 !important; margin: 0 !important; }
  .arch-mobile ul.arch-mobile-stack li { list-style: none !important; padding-left: 0 !important; margin-left: 0 !important; }
  .arch-mobile ul.arch-mobile-stack li::marker { content: none !important; color: transparent !important; }
  .arch-mobile-node { padding: 16px 18px; border: 1px solid #313842; border-radius: 6px; background: #171A20; margin: 0 0 10px 0; }
  .arch-mobile-node.primary { border-color: #4A7DFF; }
  .arch-mobile-node.secondary { border-color: #232830; background: #12151A; }
  .arch-mobile-node .arch-node-title { font-family: 'Space Grotesk','Inter',sans-serif; font-size: 17px; font-weight: 600; color: #F3EFE7; margin: 0 0 4px 0; }
  .arch-mobile-node.primary .arch-node-title { font-size: 20px; }
  .arch-mobile-node .arch-node-meta { font-family: 'JetBrains Mono',monospace; font-size: 10px; letter-spacing: 1.3px; color: #B6ADA0; text-transform: uppercase; margin: 0; }
  .arch-mobile-node .arch-node-sub { font-family: 'JetBrains Mono',monospace; font-size: 10px; color: #7B7367; margin: 2px 0 0 0; }
  .arch-mobile-arrow { text-align: center; color: #4A7DFF; font-size: 20px; line-height: 1; margin: 0 0 10px 0; font-family: monospace; }
  .arch-mobile-subheader { font-family: 'JetBrains Mono',monospace; font-size: 10px; letter-spacing: 1.5px; color: #7B7367; text-transform: uppercase; margin: 14px 0 8px 0; text-align: center; }
}