/* ================================================================
   PERCEPTAGON / lab notes — stylesheet
   Editorial / lab-notebook aesthetic. Warm parchment + ink + ember.
   ================================================================ */

:root {
  --paper: #f5efe4;
  --paper-2: #ede4d3;
  --ink: #1a1a1a;
  --ink-2: #3a3a36;
  --rule: #1a1a1a;
  --ember: #c44d2c;
  --ochre: #d4a373;
  --moss: #5a6b3f;
  --shadow: 0 1px 0 rgba(26,26,26,0.08);
  --serif: 'Fraunces', Georgia, serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--serif);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.55;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  position: relative;
  min-height: 100vh;
}

/* paper grain */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.5;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(196,77,44,0.04) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(90,107,63,0.04) 0%, transparent 40%),
    url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.12'/%3E%3C/svg%3E");
}

/* ============================ NAV ============================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
  backdrop-filter: blur(6px);
}
.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 14px 32px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.brand-mark {
  color: var(--ember);
  font-size: 16px;
}
.nav-links {
  display: flex;
  gap: 24px;
  justify-content: center;
}
.nav-links a {
  color: var(--ink);
  text-decoration: none;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}
.nav-links a:hover { border-color: var(--ember); }
.nav-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: flex-end;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-2);
}
.dot {
  width: 6px;
  height: 6px;
  background: var(--ember);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%,100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* ============================ HERO ============================ */
.hero {
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 32px 100px;
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
}
.hero::before {
  content: "";
  position: absolute;
  left: 32px; right: 32px;
  top: 60px;
  height: 1px;
  background: var(--rule);
}
.hero-tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ember);
  margin-bottom: 32px;
}
.hero-title {
  font-family: var(--serif);
  font-size: clamp(40px, 6.5vw, 84px);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 36px;
  font-variation-settings: "opsz" 144;
}
.hero-title em {
  font-style: italic;
  font-variation-settings: "opsz" 144;
  color: var(--moss);
}
.hero-title .hl {
  font-style: italic;
  color: var(--ember);
  position: relative;
  white-space: nowrap;
}
.hero-title .hl::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  bottom: 4px;
  height: 8px;
  background: rgba(196,77,44,0.18);
  z-index: -1;
}
.hero-sub {
  font-size: 19px;
  line-height: 1.6;
  max-width: 560px;
  color: var(--ink-2);
  margin-bottom: 48px;
}
.hero-sub em { font-style: italic; }
.hero-meta {
  display: flex;
  gap: 36px;
  flex-wrap: wrap;
  border-top: 1px solid var(--rule);
  padding-top: 24px;
}
.hero-meta > div {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.meta-k {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.meta-v {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
}
.hero-diagram {
  width: 100%;
  max-width: 420px;
  justify-self: center;
}
.hero-diagram svg {
  width: 100%;
  height: auto;
}

/* ============================ ARTIFACTS ============================ */
main { position: relative; z-index: 2; }

.artifact {
  padding: 100px 32px;
  border-top: 1px solid var(--rule);
  position: relative;
}
.artifact.alt {
  background: var(--paper-2);
}
.artifact-head {
  max-width: 1280px;
  margin: 0 auto 64px;
  position: relative;
}
.artifact-no {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ember);
  margin-bottom: 16px;
}
.artifact-head h2 {
  font-family: var(--serif);
  font-size: clamp(32px, 4.5vw, 56px);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin-bottom: 16px;
  max-width: 900px;
  font-variation-settings: "opsz" 144;
}
.artifact-desc {
  font-size: 17px;
  color: var(--ink-2);
  max-width: 700px;
}
.artifact-desc code {
  font-family: var(--mono);
  font-size: 14px;
  background: rgba(26,26,26,0.06);
  padding: 2px 6px;
  border-radius: 3px;
}

/* ============================ NOTE CARD (Artifact 1) ============================ */
.note-card {
  max-width: 880px;
  margin: 0 auto;
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 48px 56px 40px;
  position: relative;
  box-shadow: 8px 8px 0 var(--ink);
}
.note-frontmatter {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-2);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-bottom: 1px dashed var(--rule);
  padding-bottom: 16px;
  margin-bottom: 32px;
}
.note-h2 {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 500;
  margin-bottom: 24px;
  line-height: 1.2;
}
.note-h3 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ember);
  margin: 32px 0 12px;
}
.note-card p { margin-bottom: 14px; }
.note-card ul, .note-card ol {
  padding-left: 24px;
  margin-bottom: 16px;
}
.note-card li { margin-bottom: 6px; }
.related li {
  font-family: var(--mono);
  font-size: 14px;
}
wl {
  color: var(--moss);
  font-weight: 500;
  font-style: normal;
  cursor: default;
  border-bottom: 1px dotted var(--moss);
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px dashed var(--rule);
}
.tags span {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-2);
  background: rgba(196,77,44,0.08);
  padding: 4px 10px;
  border-radius: 3px;
}
.copy-row {
  margin-top: 32px;
  display: flex;
  gap: 12px;
}
.copy-btn, .dl-btn {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 10px 18px;
  border: 1px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s;
}
.copy-btn:hover, .dl-btn:hover {
  background: var(--ink);
  color: var(--paper);
}
.copy-btn.copied {
  background: var(--moss);
  color: var(--paper);
  border-color: var(--moss);
}

/* ============================ SYNTHESIS (Artifact 2) ============================ */
.synth-grid {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}
.synth-block {
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 40px;
  position: relative;
}
.synth-block.wide { grid-column: 1 / -1; }
.block-no {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--ember);
  margin-bottom: 12px;
}
.synth-block h3 {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 500;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}
.synth-block p { margin-bottom: 14px; }
.synth-block ul { padding-left: 24px; margin-bottom: 14px; }
.synth-block li { margin-bottom: 8px; }

.callout {
  border-left: 3px solid var(--ember);
  padding: 12px 0 12px 20px;
  margin: 24px 0 0 !important;
  font-style: italic;
  color: var(--ink-2);
}

.stack-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  margin-bottom: 16px;
}
.stack-table th, .stack-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}
.stack-table th {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
  background: var(--paper-2);
}
.stack-table td:first-child { width: 22%; }
.stack-table td:last-child { width: 28%; white-space: nowrap; }
.badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 2px 6px;
  margin-left: 4px;
  border-radius: 2px;
}
.badge.open { background: var(--moss); color: var(--paper); }
.badge.prop { background: var(--ember); color: var(--paper); }

.bio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 24px 0;
}
.bio-card {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  padding: 20px;
}
.bio-h {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ember);
  margin-bottom: 4px;
}
.bio-t {
  font-family: var(--serif);
  font-size: 18px;
  font-style: italic;
  margin-bottom: 8px;
}
.bio-d { font-size: 14px; color: var(--ink-2); line-height: 1.5; }

.surface-list { list-style: none !important; padding-left: 0 !important; }
.surface-list li {
  padding: 12px 0;
  border-bottom: 1px dashed var(--rule);
}
.surface-list li:last-child { border: none; }
.surface-list strong {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ember);
  display: inline-block;
  min-width: 130px;
}

.frame-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 20px 0;
}
.frame-card {
  border: 1px solid var(--rule);
  padding: 20px;
}
.frame-card.out { background: rgba(212,163,115,0.15); }
.frame-card.in { background: rgba(90,107,63,0.1); }
.frame-h {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 8px;
  color: var(--ember);
}

.lineage { list-style: none !important; padding-left: 0 !important; }
.lineage li {
  padding: 10px 0;
  border-bottom: 1px dashed var(--rule);
  font-size: 15px;
}
.lineage li:last-child { border: none; }

/* ============================ WORKSHEET (Artifact 3) ============================ */
.worksheet {
  max-width: 920px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 32px;
}
.ws-block {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 32px;
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 36px 40px;
  align-items: start;
}
.ws-num {
  font-family: var(--serif);
  font-style: italic;
  font-size: 64px;
  line-height: 1;
  color: var(--ember);
  font-variation-settings: "opsz" 144;
}
.ws-body h3 {
  font-family: var(--serif);
  font-size: 26px;
  font-weight: 500;
  margin-bottom: 16px;
  line-height: 1.2;
}
.ws-q {
  font-style: italic;
  color: var(--ink-2);
  border-left: 2px solid var(--ember);
  padding-left: 16px;
  margin-bottom: 20px !important;
}
.ws-prompts, .ws-phases {
  padding-left: 24px;
  margin-bottom: 16px;
}
.ws-prompts li, .ws-phases li {
  margin-bottom: 10px;
  line-height: 1.55;
}
.metaphor-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 16px;
}
.metaphor {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  padding: 16px;
}
.m-h {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ember);
  margin-bottom: 8px;
}
.m-d { font-size: 14px; color: var(--ink-2); line-height: 1.5; }
.ws-do {
  margin-top: 16px !important;
  padding: 14px 16px;
  background: var(--paper-2);
  border-left: 3px solid var(--moss);
  font-family: var(--mono);
  font-size: 14px;
}

/* ============================ PHASES (Artifact 4) ============================ */
.phase-grid {
  max-width: 1280px;
  margin: 0 auto 64px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border: 1px solid var(--rule);
  background: var(--paper);
}
.phase {
  padding: 36px 28px;
  border-right: 1px solid var(--rule);
  position: relative;
}
.phase:last-child { border-right: none; }
.p-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--ember);
  margin-bottom: 8px;
}
.p-name {
  font-family: var(--serif);
  font-size: 32px;
  font-weight: 500;
  font-style: italic;
  margin-bottom: 4px;
  letter-spacing: -0.01em;
  font-variation-settings: "opsz" 144;
}
.p-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px dashed var(--rule);
}
.phase p { font-size: 15px; line-height: 1.55; margin-bottom: 16px; }
.p-out, .p-feel {
  font-size: 13px;
  margin-bottom: 8px;
  color: var(--ink-2);
}
.p-feel {
  font-style: italic;
  color: var(--ember);
}

.value-curve {
  max-width: 1280px;
  margin: 0 auto;
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 40px;
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 40px;
  align-items: center;
}
.value-curve h3 {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 500;
  margin-bottom: 16px;
  line-height: 1.2;
}
.value-curve p { color: var(--ink-2); }
.curve-svg { width: 100%; height: auto; }

/* ============================ FOOTER ============================ */
footer {
  border-top: 1px solid var(--rule);
  padding: 60px 32px 40px;
  background: var(--paper-2);
  position: relative;
  z-index: 2;
}
.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  margin-bottom: 40px;
}
.foot-h {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ember);
  margin-bottom: 8px;
}
.foot-col p { font-size: 14px; color: var(--ink-2); }
.footer-mark {
  text-align: center;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--ink-2);
  padding-top: 24px;
  border-top: 1px solid var(--rule);
}

/* ============================ RESPONSIVE ============================ */
@media (max-width: 980px) {
  .nav-inner { grid-template-columns: 1fr auto; }
  .nav-meta { display: none; }
  .hero { grid-template-columns: 1fr; gap: 40px; padding: 60px 24px 80px; }
  .hero-diagram { max-width: 320px; }
  .synth-grid { grid-template-columns: 1fr; gap: 20px; }
  .bio-grid { grid-template-columns: 1fr; }
  .frame-grid { grid-template-columns: 1fr; }
  .phase-grid { grid-template-columns: 1fr 1fr; }
  .phase { border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
  .phase:nth-child(2) { border-right: none; }
  .phase:nth-child(3), .phase:nth-child(4) { border-bottom: none; }
  .phase:nth-child(4) { border-right: none; }
  .value-curve { grid-template-columns: 1fr; }
  .metaphor-row { grid-template-columns: 1fr; }
  .ws-block { grid-template-columns: 1fr; gap: 12px; padding: 24px; }
  .footer-inner { grid-template-columns: 1fr; gap: 24px; }
  .note-card { padding: 32px 24px; box-shadow: 4px 4px 0 var(--ink); }
  .stack-table td:last-child { white-space: normal; }
}
@media (max-width: 600px) {
  .nav-links { gap: 12px; }
  .nav-links a { font-size: 10px; }
  .artifact { padding: 60px 20px; }
  .phase-grid { grid-template-columns: 1fr; }
  .phase { border-right: none; border-bottom: 1px solid var(--rule); }
  .phase:last-child { border-bottom: none; }
}