/* =============================================================================
   Tulip Labs — tuliplabs.ai
   Editorial, evidence-first. Serif display + sans body + mono for findings.
   Warm paper, ink, a single tulip-red accent. No framework, no build step.
   ============================================================================= */

:root {
  /* palette */
  --ink:        #1B1620;   /* near-black, warm */
  --ink-soft:   #4A434C;
  --mute:       #78716C;   /* captions, labels */
  --paper:      #FBF9F8;   /* page */
  --paper-soft: #F4EFEC;   /* raised panels */
  --surface:    #FFFFFF;
  --rule:       #E7E0DB;   /* hairlines */
  --red:        #D6336C;   /* tulip red — the primary accent */
  --red-deep:   #AD2E5C;
  --teal:       #E2570E;   /* second accent — research notes, used sparingly */
  --ink-panel:  #17141C;   /* dark footer / inverted blocks */

  /* type */
  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono:  "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  /* scale */
  --measure: 42rem;       /* readable text column */
  --wide:    72rem;       /* page frame */
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---- layout primitives ---------------------------------------------------- */
.wrap { width: 100%; max-width: var(--wide); margin: 0 auto; padding: 0 1.5rem; }
.col  { max-width: var(--measure); }
section { padding: 5.5rem 0; border-top: 1px solid var(--rule); }
section:first-of-type { border-top: 0; }

/* ---- type ---------------------------------------------------------------- */
h1, h2, h3 { font-family: var(--serif); font-weight: 420; letter-spacing: -0.02em; line-height: 1.08; }
h1 { font-size: clamp(2.1rem, 4.6vw, 3.3rem); margin: 0 0 1.2rem; }
h2 { font-size: clamp(1.6rem, 2.8vw, 2.1rem); margin: 0 0 1.4rem; }
h3 { font-size: 1.3rem; letter-spacing: -0.01em; margin: 0 0 0.5rem; }
p  { margin: 0 0 1.1rem; }
a  { color: var(--red-deep); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
strong { font-weight: 600; }

.kicker {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--red);
  margin: 0 0 1.5rem;
}
.lede { font-size: clamp(1.05rem, 1.6vw, 1.22rem); color: var(--ink-soft); line-height: 1.5; }
.muted { color: var(--mute); }
.label {
  font-family: var(--sans); font-size: 0.74rem; font-weight: 600;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--mute);
}

/* ---- header -------------------------------------------------------------- */
.site-head {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--rule);
}
.site-head .wrap { display: flex; align-items: center; justify-content: space-between; height: 4.75rem; }
.brand { display: inline-flex; align-items: center; gap: 0.7rem; color: var(--ink); font-weight: 600; }
.brand:hover { text-decoration: none; }
.brand svg, .brand img { width: 38px; height: 38px; display: block; }
.brand .wordmark { font-family: var(--serif); font-size: 1.6rem; letter-spacing: -0.01em; white-space: nowrap; }
.brand .wordmark b { font-weight: 600; }
.nav { display: flex; gap: 1.6rem; align-items: center; }
.nav a { color: var(--ink-soft); font-size: 0.95rem; font-weight: 500; }
.nav a:hover { color: var(--ink); text-decoration: none; }
.nav a.active { color: var(--ink); }
.nav a { white-space: nowrap; }
@media (max-width: 620px) {
  .nav a.hide-sm { display: none; }
  /* Keep the lockup and the three remaining links on one 4.75rem row:
     smaller mark + wordmark, tighter nav. Nothing may wrap. */
  .site-head .wrap { padding: 0 1rem; }
  .brand { gap: 0.5rem; }
  .brand svg, .brand img { width: 30px; height: 30px; }
  .brand .wordmark { font-size: 1.3rem; }
  .nav { gap: 0.9rem; }
  .nav a { font-size: 0.875rem; }
}

/* ---- buttons ------------------------------------------------------------- */
.btn-row { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 2rem; }
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--sans); font-size: 0.95rem; font-weight: 550;
  padding: 0.7rem 1.25rem; border-radius: 999px; border: 1px solid var(--ink);
  color: var(--ink); background: transparent; transition: all 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn--primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn--primary:hover { background: var(--red-deep); border-color: var(--red-deep); }
.btn--ghost:hover { background: var(--paper-soft); }
.btn .arrow { transition: transform 0.15s ease; }
.btn:hover .arrow { transform: translateX(2px); }

/* ---- hero ---------------------------------------------------------------- */
.hero { padding-top: 6rem; padding-bottom: 5rem; }
.hero h1 .accent { color: var(--red); font-style: italic; }
.pip { font-family: var(--mono); font-size: 0.85rem; color: var(--mute); margin-top: 1.6rem; }
.pip b { color: var(--ink); font-weight: 500; }

/* homepage split hero — copy + figure */
.hero--split .wrap { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 3.5rem; align-items: center; }
.hero--split .col { max-width: var(--measure); }
.hero__media { width: 100%; }
.hero__media svg, .hero__media img { width: 100%; height: auto; display: block; }
@media (max-width: 880px) {
  .hero--split .wrap { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero__media { max-width: 30rem; }
}

/* ---- thesis band --------------------------------------------------------- */
.band { background: var(--paper-soft); }
.thesis { font-family: var(--serif); font-size: clamp(1.3rem, 2.4vw, 1.75rem); line-height: 1.28; letter-spacing: -0.015em; }
.thesis b { color: var(--red-deep); font-weight: 500; }

/* ---- pillars / cards ----------------------------------------------------- */
.grid-2 { display: grid; gap: 1.5rem; grid-template-columns: repeat(2, 1fr); }
.grid-3 { display: grid; gap: 1.25rem; grid-template-columns: repeat(3, 1fr); }
@media (max-width: 820px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

.card {
  background: var(--surface); border: 1px solid var(--rule); border-radius: 14px;
  padding: 2rem; transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover { border-color: color-mix(in srgb, var(--red) 45%, var(--rule)); transform: translateY(-2px); }
.card h3 { margin-top: 0.4rem; }
.card .label { display: block; margin-bottom: 0.9rem; }
.card p:last-child { margin-bottom: 0; }
.card a.more { font-weight: 550; }

/* ---- featured work ------------------------------------------------------- */
.work { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center; }
.work.flip .work__media { order: 2; }
@media (max-width: 820px) { .work { grid-template-columns: 1fr; gap: 1.75rem; } .work.flip .work__media { order: 0; } }

/* stat block — the evidence-first device */
.stats { display: flex; flex-wrap: wrap; gap: 0; border: 1px solid var(--rule); border-radius: 12px; overflow: hidden; background: var(--surface); }
.stat { flex: 1 1 33%; min-width: 120px; padding: 1.4rem 1.25rem; border-right: 1px solid var(--rule); }
.stat:last-child { border-right: 0; }
.stat .n { font-family: var(--mono); font-size: 1.7rem; font-weight: 600; color: var(--ink); letter-spacing: -0.02em; }
.stat .k { font-size: 0.8rem; color: var(--mute); margin-top: 0.2rem; }

/* code / terminal panel */
.code {
  background: var(--ink-panel); color: #ECE7F0; border-radius: 12px;
  font-family: var(--mono); font-size: 1rem; line-height: 1.7;
  padding: 1.6rem 1.8rem; overflow-x: auto; border: 1px solid #2a2533;
}
.code .c { color: #8a8295; }       /* comment */
.code .k { color: #E58FB3; }       /* keyword/red */
.code .s { color: #b7e1c4; }       /* string */
.code .fn { color: #d9b8f0; }

/* ---- principles ---------------------------------------------------------- */
.principle { padding: 1.5rem 0; border-top: 1px solid var(--rule); }
.principle:first-child { border-top: 0; }
.principle h3 { font-family: var(--sans); font-size: 1.05rem; font-weight: 650; letter-spacing: 0; }
.principle .idx { font-family: var(--mono); color: var(--red); font-size: 0.85rem; margin-right: 0.5rem; }

/* ---- footer -------------------------------------------------------------- */
.site-foot { background: var(--ink-panel); color: #C9C2D0; border-top: 0; padding: 4rem 0 3rem; }
.site-foot a { color: #E7DEEC; }
.site-foot a:hover { color: #fff; }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 2rem; }
@media (max-width: 720px) { .foot-grid { grid-template-columns: 1fr 1fr; } }
.foot-brand .wordmark { font-family: var(--serif); font-size: 1.3rem; color: #fff; }
.foot-col h4 { font-size: 0.74rem; letter-spacing: 0.16em; text-transform: uppercase; color: #8c8497; margin: 0 0 0.9rem; font-weight: 600; }
.foot-col a { display: block; font-size: 0.95rem; margin-bottom: 0.5rem; }
.foot-bottom { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid #2a2533; font-size: 0.85rem; color: #8c8497; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem; }

/* ---- screenshot / framed media ------------------------------------------ */
.shot { width: 100%; height: auto; display: block; border: 1px solid var(--rule); border-radius: 12px; box-shadow: 0 18px 40px -24px rgba(27,22,32,0.45); }

/* ---- two pillars --------------------------------------------------------- */
.pillars { display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; }
.pillars--three { grid-template-columns: 1fr 1fr 1fr; gap: 2rem; }
@media (max-width: 1000px) { .pillars--three { grid-template-columns: 1fr; gap: 2rem; } }
@media (max-width: 820px) { .pillars { grid-template-columns: 1fr; gap: 2rem; } }
.pillar__head { display: flex; align-items: baseline; gap: 0.7rem; margin-bottom: 1.3rem; padding-bottom: 0.9rem; border-bottom: 1px solid var(--rule); }
.pillar__head h3 { font-family: var(--serif); font-size: 1.4rem; margin: 0; }
.pillar .card { padding: 1.5rem; margin-bottom: 1.1rem; }
.pillar .card:last-child { margin-bottom: 0; }
.label.teal { color: var(--teal); }

/* ---- about --------------------------------------------------------------- */
.about-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 3rem; }
@media (max-width: 820px) { .about-grid { grid-template-columns: 1fr; gap: 1.75rem; } }
.about-facts { list-style: none; margin: 0; padding: 0; }
.about-facts li { padding: 0.85rem 0; border-top: 1px solid var(--rule); font-size: 0.95rem; color: var(--ink-soft); }
.about-facts li:first-child { border-top: 0; }
.about-facts b { color: var(--ink); font-weight: 600; }

/* ---- misc ---------------------------------------------------------------- */
.tag { display: inline-block; font-family: var(--mono); font-size: 0.74rem; color: var(--mute); border: 1px solid var(--rule); border-radius: 999px; padding: 0.15rem 0.7rem; margin: 0 0.3rem 0.3rem 0; }
.eyebrow-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1.5rem; }
.eyebrow-row .line { flex: 1; height: 1px; background: var(--rule); }
hr.soft { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0; }

/* ---- research programs (home) — structured list with status ------------- */
.programs { margin-top: 2.5rem; }
.prog { padding: 1.7rem 0; border-top: 1px solid var(--rule); }
.prog:first-child { border-top: 0; padding-top: 0.5rem; }
.prog__head { display: flex; align-items: baseline; gap: 1rem; flex-wrap: wrap; margin-bottom: 0.6rem; }
.prog__id { font-family: var(--mono); font-size: 0.8rem; font-weight: 600; color: var(--red); letter-spacing: 0.03em; }
.prog__head h3 { margin: 0; font-size: 1.32rem; font-weight: 440; flex: 1 1 22ch; }
.prog__body { color: var(--ink-soft); max-width: 62rem; line-height: 1.62; margin: 0; }
.status { font-family: var(--mono); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.09em;
  padding: 0.34rem 0.7rem; border-radius: 999px; border: 1px solid; white-space: nowrap;
  display: inline-flex; align-items: center; gap: 0.45rem; }
.status::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.status.ok  { color: #1F7A54; border-color: color-mix(in srgb, #1F7A54 34%, transparent); }
.status.wip { color: #B26B00; border-color: color-mix(in srgb, #B26B00 34%, transparent); }
.status.dev { color: var(--mute); border-color: var(--rule); }
@media (max-width: 620px) { .prog__head h3 { flex-basis: 100%; order: 3; } }

/* ---- contact page -------------------------------------------------------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2.5rem, 6vw, 5rem); align-items: start; }
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; gap: 3rem; } }
.contact-card { background: var(--surface); border: 1px solid var(--rule); border-radius: 16px; padding: clamp(1.6rem, 3vw, 2.4rem); }
.form { display: grid; gap: 1.25rem; }
.field { display: grid; gap: 0.45rem; }
.field label { font-family: var(--sans); font-size: 0.74rem; font-weight: 600; letter-spacing: 0.13em; text-transform: uppercase; color: var(--mute); }
.field input, .field textarea {
  font: inherit; font-size: 1rem; color: var(--ink); background: var(--paper);
  border: 1px solid var(--rule); border-radius: 10px; padding: 0.72rem 0.9rem; width: 100%;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.field input::placeholder, .field textarea::placeholder { color: var(--mute); }
.field input:focus, .field textarea:focus {
  outline: none; background: var(--surface);
  border-color: var(--red); box-shadow: 0 0 0 3px rgba(214, 51, 108, 0.12);
}
.field textarea { min-height: 8.5rem; resize: vertical; line-height: 1.55; }
.form .btn { margin-top: 0.3rem; justify-self: start; }
.form-note { font-size: 0.85rem; color: var(--mute); margin: 0; }
.form-status { font-size: 0.95rem; margin: 0; min-height: 1.2em; }
.form-status.ok  { color: #1F7A54; }
.form-status.err { color: var(--red-deep); }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }