:root {
  --companion-max: 1420px;
  --companion-gutter: clamp(20px, 4vw, 72px);
  --companion-border: rgba(40, 30, 20, 0.14);
  --companion-green-ink: #173629;
  --companion-green-deep: #0f241a;
  --companion-green-soft: #d8e0d4;
  --companion-paper: #fbf7ee;
  --companion-paper-dark: #f0e7d5;
  --companion-clay-soft: #ead0c3;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  min-width: 320px;
  margin: 0;
  color: var(--c-ink);
  background:
    radial-gradient(circle at 10% 14%, rgba(31, 58, 46, 0.055), transparent 27rem),
    radial-gradient(circle at 90% 78%, rgba(193, 106, 74, 0.06), transparent 30rem),
    var(--c-parchment);
  overflow-x: hidden;
}

body::before {
  position: fixed;
  z-index: 0;
  inset: 0;
  pointer-events: none;
  content: "";
  background-image:
    radial-gradient(rgba(60, 40, 20, 0.035) 1px, transparent 1px),
    radial-gradient(rgba(60, 40, 20, 0.022) 1px, transparent 1px);
  background-position: 0 0, 1px 1px;
  background-size: 3px 3px, 7px 7px;
  mix-blend-mode: multiply;
}

a { color: inherit; }

button, textarea { font: inherit; }

button, a { -webkit-tap-highlight-color: transparent; }

button { cursor: pointer; }

:focus-visible {
  outline: 3px solid var(--c-gold);
  outline-offset: 4px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.companion-nav,
.companion-hero,
.workbench,
.companion-footer {
  position: relative;
  z-index: 1;
}

.companion-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
  padding: 12px var(--companion-gutter);
  background: rgba(251, 247, 238, 0.9);
  border-bottom: 1px solid rgba(40, 30, 20, 0.11);
  backdrop-filter: blur(10px);
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
}

.brand-lockup img { width: 118px; height: auto; }

.brand-lockup span,
.companion-nav nav,
.route-mark,
.hero-proof,
.rail-index,
.panel-label,
.mode-stamp,
.fact-kicker,
.fact-list,
.archive-link,
.privacy-note,
.slip-label,
.drawer-status,
.message-meta,
.citation-label,
.citation-chip,
.composer-hint,
.character-count,
.scope-note,
.companion-footer,
.note-label,
.note-signature {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.brand-lockup span { color: var(--c-fog); font-size: 10px; }

.companion-nav nav { display: flex; min-width: 0; align-items: center; gap: clamp(14px, 2.3vw, 30px); font-size: 10px; }

.companion-nav nav a { text-decoration: none; color: var(--c-graphite); transition: color var(--dur-quick) var(--ease-quick); }

.companion-nav nav a:hover { color: var(--c-rust); }

.companion-nav .nav-cta {
  padding: 8px 12px;
  color: var(--c-paper);
  background: var(--c-deep-jungle);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-paper);
}

.companion-nav .nav-cta:hover { color: var(--c-paper); background: var(--companion-green-ink); }

.companion-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(250px, 0.38fr);
  gap: clamp(36px, 7vw, 120px);
  align-items: end;
  max-width: var(--companion-max);
  min-height: min(620px, calc(100vh - 72px));
  padding: clamp(72px, 10vw, 150px) var(--companion-gutter) clamp(60px, 8vw, 112px);
  margin: 0 auto;
}

.hero-copy { max-width: 840px; min-width: 0; }

.route-mark {
  margin: 0 0 26px;
  color: var(--c-rust);
  font-size: 11px;
}

.hero-copy h1 {
  max-width: 820px;
  width: 100%;
  margin: 0;
  font-size: clamp(52px, 8vw, 116px);
  line-height: 0.91;
  letter-spacing: -0.035em;
  overflow-wrap: break-word;
  text-wrap: wrap;
}

.hero-copy h1 em { color: var(--c-rust); font-style: italic; }

.hero-lede {
  max-width: 680px;
  min-width: 0;
  margin: 34px 0 0;
  color: var(--c-ink-soft);
  font-size: clamp(18px, 1.65vw, 22px);
  line-height: 1.5;
}

.hero-proof {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin-top: 38px;
  color: var(--c-graphite);
  font-size: 10px;
}

.hero-proof span { display: inline-flex; align-items: center; gap: 7px; }

.hero-proof span::before { width: 6px; height: 6px; content: ""; background: var(--c-clay); border-radius: 50%; }

.hero-proof strong { color: var(--c-deep-jungle); font-size: 13px; letter-spacing: 0.08em; }

.hero-note {
  position: relative;
  max-width: 300px;
  padding: 30px 30px 34px;
  color: var(--c-paper);
  background: var(--c-deep-jungle);
  box-shadow: -12px 18px 38px rgba(40, 30, 20, 0.17);
  transform: rotate(1.6deg);
}

.hero-note::before { position: absolute; inset: 12px; pointer-events: none; content: ""; border: 1px solid rgba(217, 180, 95, 0.38); }

.note-tape {
  position: absolute;
  top: -12px;
  left: 50%;
  width: 100px;
  height: 24px;
  background: var(--c-sage);
  opacity: 0.82;
  transform: translateX(-50%) rotate(-3deg);
}

.note-label { position: relative; margin: 0 0 28px; color: var(--c-gold); font-size: 10px; }

.note-body { position: relative; margin: 0; color: rgba(251, 247, 238, 0.89); font-size: 16px; line-height: 1.55; }

.note-signature { position: relative; display: block; margin-top: 30px; color: var(--c-sage); font-size: 10px; }

.workbench {
  display: grid;
  grid-template-columns: minmax(220px, 0.45fr) minmax(540px, 1.3fr) minmax(220px, 0.45fr);
  gap: 0;
  max-width: 1600px;
  min-height: 760px;
  margin: 0 auto 120px;
  padding: 0 var(--companion-gutter);
}

.archive-rail,
.evidence-rail { padding: 42px 28px 36px; background: rgba(244, 239, 230, 0.68); }

.archive-rail { border: 1px solid var(--companion-border); border-right: 0; }

.evidence-rail { border: 1px solid var(--companion-border); border-left: 0; }

.rail-heading,
.evidence-heading { display: flex; align-items: center; gap: 12px; }

.rail-index { color: var(--c-graphite); font-size: 10px; white-space: nowrap; }

.rail-rule { width: 100%; height: 1px; background: rgba(40, 30, 20, 0.2); }

.archive-stack { display: grid; gap: 13px; margin: 28px -8px 36px 0; }

.guide-tab {
  position: relative;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) 18px;
  gap: 12px;
  align-items: center;
  min-height: 92px;
  padding: 16px 16px 16px 18px;
  text-align: left;
  color: var(--c-paper);
  border: 0;
  border-radius: 2px;
  box-shadow: -8px 12px 20px rgba(40, 30, 20, 0.14);
  transition: transform var(--dur-base) var(--ease-natural), box-shadow var(--dur-base) var(--ease-natural), filter var(--dur-quick) var(--ease-quick);
}

.guide-tab::after { position: absolute; inset: 10px; pointer-events: none; content: ""; border: 1px solid rgba(217, 180, 95, 0.36); }

.guide-tab-b2b { background: var(--c-deep-jungle); transform: rotate(-1.2deg); }

.guide-tab-seller { color: var(--c-ink); background: var(--c-paper); transform: rotate(1.2deg); }

.guide-tab:hover,
.guide-tab.is-selected { z-index: 2; transform: translateX(10px) rotate(0deg); box-shadow: -15px 18px 26px rgba(40, 30, 20, 0.19); }

.guide-tab:active { transform: translateX(7px) rotate(-0.4deg) scale(0.99); }

.tab-number { align-self: start; color: var(--c-gold); font-family: var(--font-mono); font-size: 16px; letter-spacing: 0.04em; }

.guide-tab-seller .tab-number { color: var(--c-rust); }

.tab-copy { position: relative; z-index: 1; display: flex; flex-direction: column; gap: 5px; }

.tab-copy strong { font-family: var(--font-condensed); font-size: 19px; font-weight: 600; letter-spacing: 0.03em; line-height: 1.03; text-transform: uppercase; }

.tab-copy small { font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.1em; text-transform: uppercase; opacity: 0.72; }

.tab-arrow { position: relative; z-index: 1; align-self: start; justify-self: end; color: var(--c-gold); font-size: 18px; }

.guide-tab-seller .tab-arrow { color: var(--c-rust); }

.archive-facts { padding-top: 6px; }

.fact-kicker { margin-bottom: 12px; color: var(--c-rust); font-size: 10px; }

.archive-facts h2 { margin: 0; font-size: clamp(23px, 2.3vw, 31px); line-height: 1.04; }

.archive-facts > p { margin: 14px 0 24px; color: var(--c-graphite); font-size: 15px; line-height: 1.45; }

.fact-list { display: grid; gap: 11px; margin: 0; padding: 16px 0; border-top: 1px solid rgba(40, 30, 20, 0.16); border-bottom: 1px solid rgba(40, 30, 20, 0.16); font-size: 9px; }

.fact-list div { display: flex; justify-content: space-between; gap: 12px; }

.fact-list dt { color: var(--c-fog); }

.fact-list dd { margin: 0; color: var(--c-deep-jungle); text-align: right; }

.archive-link { display: inline-flex; gap: 8px; align-items: center; margin-top: 22px; color: var(--c-rust); font-size: 10px; text-underline-offset: 4px; }

.archive-link:hover { color: var(--c-deep-jungle); }

.privacy-note { display: flex; gap: 11px; align-items: start; margin-top: 46px; color: var(--c-graphite); font-size: 9px; line-height: 1.55; }

.privacy-note p { margin: 0; font-family: var(--font-mono); font-size: 9px; }

.privacy-note strong { color: var(--c-deep-jungle); }

.privacy-mark { display: grid; flex: 0 0 auto; width: 19px; height: 19px; place-items: center; color: var(--c-paper); background: var(--c-rust); border-radius: 50%; font-size: 16px; line-height: 1; }

.conversation-panel { display: flex; flex-direction: column; min-width: 0; padding: 42px clamp(22px, 4vw, 64px) 34px; background: var(--companion-paper); border: 1px solid var(--c-deep-jungle); box-shadow: var(--shadow-paper-lg); }

.conversation-header { display: flex; justify-content: space-between; gap: 24px; align-items: flex-start; padding-bottom: 25px; border-bottom: 1px solid rgba(40, 30, 20, 0.14); }

.panel-label { margin: 0 0 12px; color: var(--c-rust); font-size: 10px; }

.conversation-header h2 { max-width: 560px; margin: 0; font-size: clamp(26px, 3vw, 43px); line-height: 1.03; }

.mode-stamp { display: inline-flex; flex: 0 0 auto; padding: 8px 10px; color: var(--c-deep-jungle); border: 1px solid rgba(31, 58, 46, 0.45); border-radius: var(--radius-pill); font-size: 9px; white-space: nowrap; }

.mode-control { display: flex; justify-content: space-between; gap: 22px; align-items: center; padding: 19px 0 17px; }

.mode-copy { display: grid; gap: 3px; min-width: 0; }

.mode-copy strong { color: var(--c-deep-jungle); font-family: var(--font-body); font-size: 15px; }

.mode-copy span { color: var(--c-graphite); font-size: 12px; line-height: 1.35; }

.mode-toggle { display: inline-flex; flex: 0 0 auto; padding: 3px; background: var(--c-stone); border-radius: 3px; }

.mode-option { min-height: 34px; padding: 7px 11px; color: var(--c-graphite); background: transparent; border: 0; border-radius: 2px; font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.08em; text-transform: uppercase; }

.mode-option.is-selected { color: var(--c-paper); background: var(--c-deep-jungle); box-shadow: 0 2px 8px rgba(31, 58, 46, 0.18); }

.starter-prompts { display: flex; flex-wrap: wrap; gap: 8px; padding-bottom: 25px; }

.starter-prompts button { padding: 8px 10px; color: var(--c-graphite); background: transparent; border: 1px dashed rgba(40, 30, 20, 0.27); border-radius: var(--radius-pill); font-family: var(--font-body); font-size: 12px; transition: border-color var(--dur-quick), color var(--dur-quick), background var(--dur-quick); }

.starter-prompts button:hover { color: var(--c-deep-jungle); background: var(--companion-paper-dark); border-color: var(--c-rust); }

.message-list { display: flex; flex: 1 1 auto; flex-direction: column; gap: 18px; min-height: 260px; max-height: 490px; padding: 4px 4px 25px 0; overflow-y: auto; scrollbar-color: var(--c-sage) transparent; }

.empty-case { display: grid; align-content: center; justify-items: center; min-height: 230px; padding: 24px; color: var(--c-graphite); text-align: center; }

.empty-case p { max-width: 34ch; margin: 14px 0 0; font-size: 16px; line-height: 1.45; }

.empty-mark { display: grid; width: 46px; height: 46px; place-items: center; color: var(--c-paper); background: var(--c-clay); border-radius: 50%; font-family: var(--font-display); font-size: 28px; }

.message { max-width: 88%; }

.message-user { align-self: end; }

.message-assistant { align-self: start; }

.message-meta { margin-bottom: 7px; color: var(--c-fog); font-size: 9px; }

.message-user .message-meta { text-align: right; }

.message-body { padding: 15px 17px; border: 1px solid rgba(40, 30, 20, 0.12); border-radius: 2px; }

.message-body p { margin: 0; color: var(--c-ink-soft); font-size: 15px; line-height: 1.56; white-space: pre-wrap; }

.message-body p + p { margin-top: 13px; }

.message-user .message-body { color: var(--c-paper); background: var(--c-deep-jungle); border-color: var(--c-deep-jungle); }

.message-user .message-body p { color: var(--c-paper); }

.message-assistant .message-body { background: #f3ead9; border-color: rgba(193, 106, 74, 0.25); }

.citation-row { display: flex; flex-wrap: wrap; gap: 7px; align-items: center; margin-top: 17px; padding-top: 12px; border-top: 1px solid rgba(40, 30, 20, 0.13); }

.citation-label { margin-right: 2px; color: var(--c-rust); font-size: 9px; }

.citation-chip { display: inline-flex; align-items: center; min-width: 0; max-width: 100%; min-height: 24px; overflow: hidden; padding: 4px 7px; color: var(--c-deep-jungle); background: rgba(165, 181, 158, 0.34); border: 1px solid rgba(31, 58, 46, 0.22); border-radius: 2px; font-size: 9px; text-decoration: none; text-overflow: ellipsis; white-space: nowrap; }

.citation-chip:hover { color: var(--c-paper); background: var(--c-deep-jungle); }

.citation-source { background: rgba(217, 180, 95, 0.25); border-color: rgba(160, 123, 40, 0.34); }

.citation-chapter { background: rgba(217, 180, 95, 0.2); border-color: rgba(160, 123, 40, 0.3); }

.citation-web { color: var(--c-rust); background: rgba(234, 208, 195, 0.52); border-color: rgba(193, 106, 74, 0.36); }

.composer { margin-top: auto; padding-top: 18px; border-top: 1px solid rgba(40, 30, 20, 0.15); }

.composer textarea { display: block; width: 100%; min-height: 70px; padding: 14px 15px; resize: vertical; color: var(--c-ink); background: #fffdf8; border: 1px solid rgba(31, 58, 46, 0.42); border-radius: 2px; font-size: 16px; line-height: 1.45; }

.composer textarea::placeholder { color: #6e746d; opacity: 1; }

.composer textarea:focus { border-color: var(--c-rust); box-shadow: 0 0 0 3px rgba(193, 106, 74, 0.12); outline: 0; }

.composer-footer { display: grid; grid-template-columns: 1fr auto auto; gap: 14px; align-items: center; margin-top: 11px; }

.composer-hint { color: var(--c-fog); font-size: 9px; }

kbd { display: inline-block; min-width: 17px; padding: 2px 4px; color: var(--c-graphite); background: var(--c-stone); border: 1px solid rgba(40, 30, 20, 0.18); border-bottom-width: 2px; border-radius: 2px; font-family: var(--font-mono); font-size: 9px; text-align: center; }

.character-count { color: var(--c-fog); font-size: 9px; white-space: nowrap; }

.send-button { display: inline-flex; gap: 12px; align-items: center; min-height: 42px; padding: 10px 14px; color: var(--c-paper); background: var(--c-rust); border: 0; border-radius: 2px; box-shadow: var(--shadow-paper); font-family: var(--font-body); font-size: 14px; font-weight: 600; transition: transform var(--dur-quick) var(--ease-natural), background var(--dur-quick), opacity var(--dur-quick); }

.send-button:hover { background: var(--c-deep-jungle); transform: translateY(-2px); }

.send-button:disabled { cursor: wait; opacity: 0.66; transform: none; }

.send-arrow { font-size: 19px; line-height: 1; }

.composer-error { margin: 12px 0 0; color: var(--c-rust); font-size: 13px; line-height: 1.4; }

.scope-note { margin: 17px 0 0; color: var(--c-fog); font-size: 9px; line-height: 1.5; }

.evidence-heading { justify-content: space-between; padding-bottom: 17px; border-bottom: 1px solid rgba(40, 30, 20, 0.16); }

.drawer-status { color: var(--c-fern); font-size: 9px; }

.drawer-status.is-reading { color: var(--c-rust); }

.evidence-slip { position: relative; margin-top: 28px; padding: 24px 20px 21px; border: 1px solid rgba(40, 30, 20, 0.16); box-shadow: var(--shadow-paper); }

.evidence-slip-primary { background: var(--c-paper); transform: rotate(-1.2deg); }

.evidence-slip-secondary { margin-top: 18px; background: var(--companion-clay-soft); transform: rotate(1.4deg); }

.slip-pin { position: absolute; top: -8px; left: 50%; width: 32px; height: 17px; background: var(--c-sage); opacity: 0.84; transform: translateX(-50%) rotate(-3deg); }

.slip-label { display: block; margin-bottom: 18px; color: var(--c-rust); font-size: 9px; }

.evidence-slip strong { display: block; color: var(--companion-green-ink); font-family: var(--font-display); font-size: 22px; line-height: 1.08; }

.evidence-slip p { margin: 12px 0 0; color: var(--c-graphite); font-size: 14px; line-height: 1.48; }

.drawer-footer { display: flex; gap: 14px; align-items: center; margin-top: 48px; padding-top: 18px; border-top: 1px solid rgba(40, 30, 20, 0.16); }

.drawer-footer p { margin: 0; color: var(--c-graphite); font-size: 13px; line-height: 1.4; }

.drawer-compass { display: grid; flex: 0 0 auto; width: 34px; height: 34px; place-items: center; color: var(--c-rust); border: 1px solid var(--c-rust); border-radius: 50%; font-family: var(--font-display); font-size: 18px; font-weight: 700; }

.companion-footer { display: grid; grid-template-columns: 1fr auto 1fr; gap: 24px; align-items: center; padding: 32px var(--companion-gutter); color: var(--c-sage); background: var(--companion-green-deep); }

.companion-footer strong { display: block; color: var(--c-paper); font-family: var(--font-condensed); font-size: 14px; letter-spacing: 0.17em; text-transform: uppercase; }

.companion-footer span,
.companion-footer a { font-size: 10px; }

.companion-footer a { color: var(--c-gold); text-underline-offset: 3px; }

.footer-links { display: flex; gap: 20px; justify-content: center; }

.footer-credit { color: var(--c-sage); font-size: 10px; line-height: 1.6; text-align: right; }

.footer-credit a { color: var(--c-paper); }

@media (max-width: 1120px) {
  .workbench { grid-template-columns: minmax(190px, 0.38fr) minmax(500px, 1fr); }
  .evidence-rail { display: grid; grid-template-columns: auto 1fr 1fr; gap: 22px; align-items: start; grid-column: 1 / -1; border: 1px solid var(--companion-border); border-top: 0; }
  .evidence-heading { grid-column: 1; display: grid; align-content: start; gap: 8px; padding: 0; border: 0; }
  .evidence-slip { margin: 0; }
  .drawer-footer { display: none; }
}

@media (max-width: 820px) {
  .companion-nav nav a:not(.nav-cta) { display: none; }
  .companion-hero { grid-template-columns: 1fr; min-height: auto; padding-top: 74px; }
  .hero-note { justify-self: start; max-width: 360px; }
  .workbench { display: block; max-width: 720px; margin-bottom: 76px; padding: 0 var(--companion-gutter); }
  .archive-rail { border-right: 1px solid var(--companion-border); border-bottom: 0; }
  .archive-stack { grid-template-columns: 1fr 1fr; margin-right: 0; }
  .guide-tab:hover, .guide-tab.is-selected { transform: translateY(-5px) rotate(0deg); }
  .archive-facts { max-width: 560px; }
  .privacy-note { max-width: 420px; margin-top: 30px; }
  .conversation-panel { border-top: 0; }
  .evidence-rail { display: grid; grid-template-columns: minmax(110px, 0.5fr) 1fr 1fr; border-top: 0; }
  .companion-footer { grid-template-columns: 1fr 1fr; }
  .footer-links { justify-content: start; grid-row: 2; }
  .footer-credit { grid-column: 2; grid-row: 1 / span 2; }
}

@media (max-width: 560px) {
  .companion-nav { width: 100%; min-height: 62px; gap: 10px; padding-block: 9px; }
  .brand-lockup { gap: 9px; }
  .brand-lockup img { width: 94px; }
  .brand-lockup span { display: none; }
  .companion-nav .nav-cta { max-width: calc(100vw - 142px); overflow: hidden; padding: 7px 9px; font-size: 8px; text-overflow: ellipsis; white-space: nowrap; }
  .companion-hero { padding-top: 58px; padding-bottom: 58px; }
  .hero-copy { width: 100%; max-width: calc(100vw - 40px); }
  .route-mark { font-size: 9px; }
  .hero-copy h1 { width: 100%; max-width: calc(100vw - 40px); font-size: clamp(44px, 13vw, 70px); overflow-wrap: anywhere; }
  .hero-lede { width: 100%; max-width: calc(100vw - 40px); margin-top: 26px; font-size: 17px; }
  .hero-proof { margin-top: 27px; font-size: 8px; }
  .hero-note { padding: 27px 24px 29px; }
  .workbench { padding: 0 12px; }
  .archive-rail, .evidence-rail { padding: 30px 19px; }
  .archive-stack { grid-template-columns: 1fr; gap: 11px; }
  .guide-tab { min-height: 82px; }
  .conversation-panel { padding: 30px 18px 25px; }
  .conversation-header { display: block; }
  .mode-stamp { margin-top: 17px; }
  .mode-control { display: block; }
  .mode-toggle { width: 100%; margin-top: 14px; }
  .mode-option { flex: 1; width: 50%; }
  .starter-prompts { flex-direction: column; }
  .starter-prompts button { width: 100%; text-align: left; }
  .message { max-width: 96%; }
  .composer-footer { grid-template-columns: 1fr auto; }
  .composer-hint { grid-column: 1 / -1; order: 2; }
  .character-count { justify-self: end; }
  .send-button { width: 100%; justify-content: space-between; }
  .evidence-rail { display: block; }
  .evidence-heading { display: flex; }
  .evidence-slip { margin-top: 24px; }
  .companion-footer { display: block; }
  .footer-links { flex-wrap: wrap; margin-top: 24px; }
  .footer-credit { margin-top: 24px; text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}