/* ==========================================================================
   Calgebra site — "Solved State" visual system.
   Tokens inlined from calgebra_brand_handoff/tokens.css.
   Rules: color is a solve verdict, not decoration.
   Vermilion = infeasible, amber = feasible-but-costly, teal = optimal.
   Never use vermilion for CTAs, links, eyebrows, or decoration.
   ========================================================================== */

:root {
  /* Ground */
  --cal-ink:        #14161A;
  --cal-bone:       #F3F0E9;
  --cal-bone-deep:  #E7E2D7;
  --cal-card:       #FFFFFF;
  --cal-hairline:   #DCD5C6;

  /* Text */
  --cal-text:       #14161A;
  --cal-text-body:  #3A4048;
  --cal-text-mute:  #6C7480;
  --cal-text-on-ink:       #F3F0E9;
  --cal-text-on-ink-soft:  rgba(243, 240, 233, 0.72);

  /* Signal scale — only legal when the element is asserting that state */
  --cal-unsolved:      #E8452A;
  --cal-almost:        #D98A12;
  --cal-almost-text:   #A9690A;
  --cal-solved:        #0E6B5E;
  --cal-solved-bright: #3FBFA8;

  /* Signal washes — card/badge backgrounds only */
  --cal-unsolved-wash: #FCE9E4;
  --cal-almost-wash:   #FAEEDA;
  --cal-solved-wash:   #E1EFEB;

  /* Type */
  --cal-font-display: 'Bricolage Grotesque', system-ui, sans-serif;
  --cal-font-body:    'Instrument Sans', system-ui, sans-serif;
  --cal-font-mono:    'IBM Plex Mono', ui-monospace, monospace;

  --cal-tracking-display: -0.045em;
  --cal-tracking-mono:     0.16em;

  /* Form */
  --cal-radius-card:  4px;
  --cal-radius-pill:  999px;
  --cal-radius-block: 3px;
  --cal-border:       1px solid var(--cal-hairline);

  /* Grid overlay */
  --cal-grid-size:    56px;
  --cal-grid-opacity: 0.14;

  /* Layout */
  --wrap:        1200px;
  --wrap-narrow: 780px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--cal-font-body);
  font-size: 17px;
  line-height: 1.6;
  color: var(--cal-text);
  background: var(--cal-bone);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { max-width: 100%; height: auto; display: block; }

a { color: var(--cal-solved); text-decoration: none; }
a:hover { color: var(--cal-ink); text-decoration: underline; text-underline-offset: 3px; }

h1, h2, h3, h4 {
  font-family: var(--cal-font-display);
  color: var(--cal-text);
  line-height: 1.05;
  letter-spacing: var(--cal-tracking-display);
  margin: 0 0 0.5em;
  font-weight: 600;
  text-wrap: balance;
}
h1 { font-weight: 800; font-size: clamp(2.5rem, 4.2vw + 1rem, 4.5rem); }
h2 { font-size: clamp(1.75rem, 1.8vw + 1rem, 2.5rem); letter-spacing: -0.03em; }
h3 { font-size: 1.375rem; letter-spacing: -0.02em; }
h4 {
  font-family: var(--cal-font-mono);
  font-size: 0.6875rem; text-transform: uppercase;
  letter-spacing: var(--cal-tracking-mono);
  color: var(--cal-text-mute); font-weight: 500;
}

p { margin: 0 0 1em; color: var(--cal-text-body); text-wrap: pretty; }
p.lead { font-size: 1.1875rem; line-height: 1.55; color: var(--cal-text-body); max-width: 60ch; }

/* Mono eyebrow: 01 — SECTION */
.cal-eyebrow {
  display: inline-block;
  font-family: var(--cal-font-mono);
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cal-text-mute);
  margin-bottom: 14px;
}
.cal-eyebrow.on-ink { color: var(--cal-solved-bright); }

/* Wrappers */
.wrap        { max-width: var(--wrap); margin: 0 auto; padding: 0 40px; }
.wrap-narrow { max-width: var(--wrap-narrow); margin: 0 auto; padding: 0 40px; }
@media (max-width: 600px) {
  .wrap, .wrap-narrow { padding: 0 24px; }
}

/* --- Header --- */
.site-header {
  background: var(--cal-ink);
  color: var(--cal-text-on-ink);
  position: sticky; top: 0; z-index: 20;
}
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.brand {
  display: inline-flex; align-items: center; gap: 12px;
  color: var(--cal-text-on-ink);
  font-family: var(--cal-font-display);
  font-weight: 800; font-size: 1.1875rem;
  letter-spacing: -0.04em;
  text-decoration: none;
}
.brand:hover { text-decoration: none; color: var(--cal-text-on-ink); }
.brand svg { width: 26px; height: 26px; }
.brand svg .accent { fill: var(--cal-solved-bright); }

.site-nav {
  display: flex; gap: 28px; align-items: center;
  font-family: var(--cal-font-mono);
  font-size: 0.65625rem;
  letter-spacing: var(--cal-tracking-mono);
  text-transform: uppercase;
}
.site-nav a {
  color: var(--cal-text-on-ink-soft); font-weight: 400;
  padding: 8px 0;
}
.site-nav a:hover { color: var(--cal-text-on-ink); text-decoration: none; }
.site-nav a.active { color: var(--cal-text-on-ink); }
.site-nav .cta {
  background: var(--cal-bone); color: var(--cal-ink);
  padding: 10px 16px; border-radius: var(--cal-radius-pill);
  font-weight: 500;
}
.site-nav .cta:hover { background: var(--cal-solved-bright); color: #0B2A25; }
@media (max-width: 480px) {
  .site-nav { gap: 14px; }
  .site-nav a:not(.cta) { display: none; }
}

/* --- Ink section (dark ground with grid overlay) --- */
.ink-section {
  position: relative; overflow: hidden;
  background: var(--cal-ink); color: var(--cal-text-on-ink);
}
.ink-section .grid-overlay {
  position: absolute; inset: 0; pointer-events: none;
  opacity: var(--cal-grid-opacity);
  background-image:
    linear-gradient(to right, var(--cal-bone) 1px, transparent 1px),
    linear-gradient(to bottom, var(--cal-bone) 1px, transparent 1px);
  background-size: var(--cal-grid-size) var(--cal-grid-size);
}
.ink-section > .wrap,
.ink-section > .wrap-narrow { position: relative; }
.ink-section h1, .ink-section h2, .ink-section h3, .ink-section h4 { color: var(--cal-text-on-ink); }
.ink-section p { color: var(--cal-text-on-ink-soft); }

/* --- Hero --- */
.hero {
  padding: clamp(64px, 8vw, 112px) 0 clamp(72px, 8vw, 120px);
}
/* Single-column hero for inner pages */
.hero-simple {
  padding: clamp(56px, 7vw, 96px) 0 clamp(56px, 7vw, 96px);
}
.hero-simple h1 { max-width: 20ch; margin: 12px 0 20px; }
.hero-simple p.lead { max-width: 60ch; margin: 0; }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}
.hero-copy { display: flex; flex-direction: column; gap: 24px; }
.hero-copy h1 { margin: 0; }
.hero-copy p.lead { margin: 0; max-width: 490px; }
.hero-actions { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.hero-visual { min-width: 0; }
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { max-width: 560px; margin: 0 auto; width: 100%; }
}

/* Objective panel mock (in ink hero) */
.objective-panel {
  background: rgba(243, 240, 233, 0.05);
  border: 1px solid rgba(243, 240, 233, 0.16);
  border-radius: 6px;
  padding: 22px;
  display: flex; flex-direction: column; gap: 16px;
}
.objective-panel .row-head {
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--cal-font-mono);
  font-size: 0.625rem; letter-spacing: var(--cal-tracking-mono);
  text-transform: uppercase; color: rgba(243, 240, 233, 0.55);
}
.objective-panel .row-head .state-almost { color: var(--cal-almost); }
.objective-panel .metrics { display: flex; flex-direction: column; gap: 14px; }
.objective-panel .metric { display: flex; flex-direction: column; gap: 7px; }
.objective-panel .metric-row {
  display: flex; justify-content: space-between;
  font-size: 0.8125rem; color: rgba(243, 240, 233, 0.85);
}
.objective-panel .metric-row .value {
  font-family: var(--cal-font-mono); color: var(--cal-text-on-ink);
}
.objective-panel .bar {
  height: 6px; border-radius: var(--cal-radius-pill);
  background: rgba(243, 240, 233, 0.12); overflow: hidden;
}
.objective-panel .bar > span { display: block; height: 100%; }
.objective-panel .bar.almost > span { background: var(--cal-almost); }
.objective-panel .bar.solved > span { background: var(--cal-solved); }
.objective-panel .footer {
  border-top: 1px solid rgba(243, 240, 233, 0.14); padding-top: 14px;
  font-family: var(--cal-font-mono);
  font-size: 0.6875rem; color: rgba(243, 240, 233, 0.6);
}

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 15px 26px; border-radius: var(--cal-radius-pill);
  font-family: var(--cal-font-body);
  font-weight: 600; font-size: 0.9375rem;
  border: 1px solid transparent;
  transition: transform 60ms ease, background 120ms ease, color 120ms ease, border-color 120ms ease;
  cursor: pointer;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
/* On bone grounds */
.btn-primary { background: var(--cal-ink); color: var(--cal-bone); }
.btn-primary:hover { background: #0A0B0E; color: var(--cal-bone); }
.btn-secondary {
  background: transparent; color: var(--cal-ink);
  border-color: var(--cal-hairline);
}
.btn-secondary:hover { border-color: var(--cal-ink); color: var(--cal-ink); }
/* On ink grounds */
.btn-solved {
  background: var(--cal-solved-bright); color: #0B2A25;
}
.btn-solved:hover { background: #4DD0B8; color: #0B2A25; }
.btn-ghost-on-ink {
  background: transparent; color: var(--cal-text-on-ink);
  border-color: rgba(243, 240, 233, 0.3);
}
.btn-ghost-on-ink:hover { border-color: var(--cal-text-on-ink); color: var(--cal-text-on-ink); }
.btn .arr { transition: transform 120ms ease; }
.btn:hover .arr { transform: translateX(3px); }

/* --- Sections --- */
section { padding: clamp(64px, 7vw, 96px) 0; }
section.tight { padding: clamp(40px, 5vw, 64px) 0; }
.section-heading { max-width: 720px; margin: 0 0 48px; }
.section-heading p { margin: 8px 0 0; color: var(--cal-text-body); }

/* --- Two-column --- */
.two-col {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 48px; align-items: start;
}
@media (max-width: 800px) { .two-col { grid-template-columns: 1fr; gap: 24px; } }

/* --- Card grid --- */
.cards {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
@media (max-width: 900px) { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .cards { grid-template-columns: 1fr; } }

.cards.four-up { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 1000px) { .cards.four-up { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px)  { .cards.four-up { grid-template-columns: 1fr; } }

.card {
  background: var(--cal-card);
  border: var(--cal-border);
  border-radius: var(--cal-radius-card);
  padding: 28px;
  display: flex; flex-direction: column; gap: 12px;
  transition: border-color 120ms ease, transform 120ms ease;
}
.card:hover { border-color: var(--cal-ink); transform: translateY(-1px); }
.card .num {
  width: 34px; height: 34px; border-radius: 4px;
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--cal-font-mono); font-size: 0.8125rem;
}
.card .num.unsolved { background: var(--cal-unsolved-wash); color: var(--cal-unsolved); }
.card .num.almost   { background: var(--cal-almost-wash);   color: var(--cal-almost-text); }
.card .num.solved   { background: var(--cal-solved-wash);   color: var(--cal-solved); }
.card .num.ink      { background: var(--cal-bone-deep); color: var(--cal-ink); }
.card h3 {
  margin: 0; font-family: var(--cal-font-display); font-weight: 600;
  font-size: 1.375rem; letter-spacing: -0.02em;
}
.card p { margin: 0; color: var(--cal-text-body); font-size: 0.96875rem; }
.card a.card-link {
  margin-top: auto; padding-top: 12px;
  color: var(--cal-ink); font-weight: 500;
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--cal-font-mono);
  font-size: 0.6875rem; letter-spacing: var(--cal-tracking-mono);
  text-transform: uppercase;
}
.card a.card-link:hover { color: var(--cal-solved); text-decoration: none; }
.card a.card-link .arr { transition: transform 120ms ease; }
.card:hover a.card-link .arr { transform: translateX(3px); }

/* Card that is itself a link */
a.card { text-decoration: none; color: inherit; }
a.card:hover { text-decoration: none; }

/* --- Feature strip --- */
.feature-strip { background: var(--cal-bone-deep); }
.feature-strip .items {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px;
}
@media (max-width: 720px) { .feature-strip .items { grid-template-columns: 1fr; } }
.feature-strip h4 { color: var(--cal-text-mute); margin-bottom: 8px; }
.feature-strip .item-title {
  font-family: var(--cal-font-display); font-weight: 600;
  font-size: 1.25rem; letter-spacing: -0.02em; color: var(--cal-ink);
  margin-bottom: 6px;
}
.feature-strip p { margin: 0; color: var(--cal-text-body); font-size: 0.96875rem; }

/* --- Long-form (solution/about detail pages) --- */
.longform p { font-size: 1.0625rem; }
.longform p + p { margin-top: 1em; }
.longform ul { padding-left: 0; list-style: none; margin: 28px 0; }
.longform ul li {
  padding: 16px 0 16px 32px; position: relative;
  border-top: 1px solid var(--cal-hairline);
}
.longform ul li:last-child { border-bottom: 1px solid var(--cal-hairline); }
.longform ul li::before {
  content: "→"; position: absolute; left: 0; top: 16px;
  color: var(--cal-solved); font-weight: 700;
}
.longform ul li strong { color: var(--cal-ink); }
.longform em { color: var(--cal-ink); font-style: italic; }

/* --- CTA band (bone-deep, ink text) --- */
.cta-band {
  background: var(--cal-bone-deep);
  padding: clamp(48px, 6vw, 80px) 0;
}
.cta-band .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 40px; flex-wrap: wrap;
}
.cta-band h2 { margin: 0; max-width: 620px; font-size: clamp(1.5rem, 2vw + 1rem, 2.375rem); }
.cta-band .cta-copy p { margin: 8px 0 0; max-width: 60ch; color: var(--cal-text-body); }

/* --- Contact --- */
.contact-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
@media (max-width: 800px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-block {
  background: var(--cal-card);
  border: var(--cal-border);
  border-radius: var(--cal-radius-card);
  padding: 24px;
}
.contact-block h4 { margin-bottom: 10px; }
.contact-block .value {
  font-family: var(--cal-font-mono);
  font-size: 1rem; font-weight: 500; color: var(--cal-ink);
}
.contact-block .value a { color: inherit; }
.contact-block .value a:hover { color: var(--cal-solved); }

/* --- Footer --- */
.site-footer {
  background: var(--cal-ink);
  color: var(--cal-text-on-ink-soft);
  padding: 64px 0 32px;
  font-size: 0.9375rem;
}
.site-footer .cols {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px;
}
@media (max-width: 800px) { .site-footer .cols { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .site-footer .cols { grid-template-columns: 1fr; } }
.site-footer h4 {
  color: var(--cal-text-on-ink); margin-bottom: 16px;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer ul li { margin-bottom: 10px; }
.site-footer a { color: var(--cal-text-on-ink-soft); }
.site-footer a:hover { color: var(--cal-text-on-ink); text-decoration: none; }
.site-footer .brand { margin-bottom: 12px; }
.site-footer .tag { color: var(--cal-text-on-ink-soft); max-width: 32ch; margin-top: 14px; }
.site-footer .legal {
  margin-top: 48px; padding-top: 20px;
  border-top: 1px solid rgba(243, 240, 233, 0.14);
  display: flex; justify-content: space-between; align-items: center;
  color: var(--cal-text-on-ink-soft);
  font-family: var(--cal-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}
@media (max-width: 480px) {
  .site-footer .legal { flex-direction: column; gap: 8px; text-align: center; }
}