/* ================================================================
   XCurve AI — Design System
   Editorial Instrument · warm paper, ink, teal + gold signal
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,700;9..144,800&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* surfaces */
  --paper:      #FBFAF7;
  --paper-dim:  #F3F1EA;
  --card:       #FFFFFF;
  --ink:        #14181D;
  --ink-soft:   #4A535E;
  --ink-faint:  #8A92A0;
  --line:       #E4E1D8;
  --line-strong:#D2CEC0;

  /* signal colors */
  --teal:       #0E8C7C;
  --teal-deep:  #0A6B5F;
  --teal-tint:  #E4F2EF;
  --teal-line:  rgba(14,140,124,.28);

  --gold:       #B8893B;
  --gold-deep:  #8F6A2A;
  --gold-tint:  #FAF1E1;

  --red:        #C04A41;
  --red-tint:   #FBEDEA;

  /* type */
  --f-display: 'Fraunces', serif;
  --f-body:    'Inter', sans-serif;
  --f-mono:    'JetBrains Mono', monospace;

  /* radii */
  --r1: 4px; --r2: 10px; --r3: 16px; --r4: 24px; --r-pill: 100px;

  /* motion */
  --ease: cubic-bezier(.4,0,.2,1);
  --t1: .15s; --t2: .3s; --t3: .55s;

  --max-w: 1180px;
  --nav-h: 76px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--f-body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--teal); color: var(--paper); }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { cursor: pointer; border: 0; background: none; font-family: inherit; color: inherit; }
ul { list-style: none; }

:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

/* ── Layout helpers ─────────────────────────────────────────── */
.wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 2rem; }
.section { position: relative; }
.section-pad { padding: 6.5rem 0; }
.section-pad-sm { padding: 4.5rem 0; }

.eyebrow {
  display: inline-flex; align-items: center; gap: .6rem;
  font-family: var(--f-mono); font-size: .72rem;
  color: var(--teal-deep); letter-spacing: .1em; text-transform: uppercase;
  margin-bottom: 1.1rem;
}
.eyebrow::before {
  content: '';
  width: 22px; height: 1px;
  background: var(--teal);
  flex-shrink: 0;
}
.eyebrow--gold { color: var(--gold-deep); }
.eyebrow--gold::before { background: var(--gold); }
.eyebrow--center { justify-content: center; }
.eyebrow--center::before { display: none; }

h1, h2, h3, h4 { font-family: var(--f-display); font-weight: 600; letter-spacing: -.01em; color: var(--ink); }

.h-display {
  font-size: clamp(2.6rem, 5vw, 4.6rem);
  font-weight: 600; line-height: 1.04; letter-spacing: -.02em;
}
.h-section {
  font-size: clamp(2rem, 3.4vw, 2.9rem);
  font-weight: 600; line-height: 1.12; letter-spacing: -.015em;
  margin-bottom: 1.1rem;
}
.h-sub { font-family: var(--f-display); font-size: 1.4rem; font-weight: 600; margin-bottom: .6rem; }

.lede {
  font-size: 1.18rem; color: var(--ink-soft); line-height: 1.65;
  max-width: 600px;
}
.body-text { font-size: 1.02rem; color: var(--ink-soft); line-height: 1.75; max-width: 560px; }
.fine { font-family: var(--f-mono); font-size: .74rem; color: var(--ink-faint); letter-spacing: .04em; }

.italic { font-style: italic; }
.txt-teal { color: var(--teal-deep); }
.txt-gold { color: var(--gold-deep); }

/* ── Reveal ─────────────────────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity var(--t3) var(--ease), transform var(--t3) var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--f-body); font-size: .92rem; font-weight: 600;
  border-radius: var(--r-pill); padding: .85rem 1.7rem;
  transition: transform var(--t2) var(--ease), box-shadow var(--t2), background var(--t2), border-color var(--t2), color var(--t2);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }

.btn--primary { background: var(--ink); color: var(--paper); }
.btn--primary:hover { background: var(--teal-deep); box-shadow: 0 8px 24px rgba(14,140,124,.25); }

.btn--teal { background: var(--teal); color: #fff; }
.btn--teal:hover { background: var(--teal-deep); box-shadow: 0 8px 24px rgba(14,140,124,.3); }

.btn--ghost { background: transparent; color: var(--ink); border: 1.5px solid var(--line-strong); }
.btn--ghost:hover { border-color: var(--teal); color: var(--teal-deep); }

.btn--gold { background: var(--gold); color: #fff; }
.btn--gold:hover { background: var(--gold-deep); box-shadow: 0 8px 24px rgba(184,137,59,.3); }

.btn--lg { padding: 1.05rem 2.2rem; font-size: 1rem; }

/* ── Nav ────────────────────────────────────────────────────── */
#nav {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2.5rem;
  z-index: 1000;
  background: rgba(251,250,247,.85);
  backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t2), box-shadow var(--t2);
}
#nav.nav--scrolled { border-color: var(--line); box-shadow: 0 1px 0 rgba(20,24,29,.02); }

.nav__logo { display: flex; align-items: center; gap: .55rem; font-family: var(--f-display); font-weight: 700; font-size: 1.2rem; }
.nav__logo em { font-style: normal; color: var(--teal-deep); }

.nav__links { display: flex; align-items: center; gap: 2.1rem; }
.nav__links a {
  font-size: .87rem; font-weight: 500; color: var(--ink-soft);
  transition: color var(--t2); position: relative;
}
.nav__links a:hover, .nav__links a.is-active { color: var(--ink); }
.nav__links a.is-active::after {
  content: ''; position: absolute; bottom: -20px; left: 0; right: 0; height: 2px; background: var(--teal);
}

.nav__cta {
  background: var(--ink); color: var(--paper) !important;
  font-weight: 600 !important; font-size: .85rem !important;
  padding: .58rem 1.3rem; border-radius: var(--r-pill);
  transition: background var(--t2), transform var(--t2);
}
.nav__cta:hover { background: var(--teal-deep); transform: translateY(-1px); }

.nav__burger { display: none; flex-direction: column; gap: 5px; padding: 4px; }
.nav__burger span { display: block; width: 22px; height: 1.5px; background: var(--ink); transition: transform var(--t2), opacity var(--t2); }
.nav__burger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav__burger.open span:nth-child(2) { opacity: 0; }
.nav__burger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ── Cards ──────────────────────────────────────────────────── */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r3);
  transition: border-color var(--t2), box-shadow var(--t2), transform var(--t2);
}
.card:hover { border-color: var(--line-strong); box-shadow: 0 20px 48px rgba(20,24,29,.06); transform: translateY(-3px); }

.tag {
  display: inline-flex; align-items: center; gap: .4rem;
  font-family: var(--f-mono); font-size: .65rem; letter-spacing: .08em; text-transform: uppercase;
  padding: .25rem .6rem; border-radius: var(--r1);
  background: var(--teal-tint); color: var(--teal-deep);
}
.tag--gold { background: var(--gold-tint); color: var(--gold-deep); }

/* ── Curve motif (signature element) ───────────────────────── */
.curve-divider { display: block; width: 100%; height: auto; }
.curve-divider path { vector-effect: non-scaling-stroke; }

/* ── Footer ─────────────────────────────────────────────────── */
footer { background: var(--ink); color: rgba(251,250,247,.75); padding: 4.5rem 0 2rem; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 3rem; margin-bottom: 3.5rem; }
.footer-brand { display: flex; align-items: center; gap: .55rem; font-family: var(--f-display); font-weight: 700; font-size: 1.15rem; color: #fff; margin-bottom: .9rem; }
.footer-brand em { font-style: normal; color: var(--teal); }
.footer-desc { font-size: .85rem; line-height: 1.7; max-width: 260px; color: rgba(251,250,247,.55); }
.footer-locale { font-size: .76rem; margin-top: .7rem; color: rgba(251,250,247,.4); }
.footer-col h4 { font-family: var(--f-mono); font-size: .68rem; font-weight: 500; letter-spacing: .1em; text-transform: uppercase; color: rgba(251,250,247,.45); margin-bottom: 1rem; }
.footer-col ul { display: flex; flex-direction: column; gap: .6rem; }
.footer-col a { font-size: .85rem; color: rgba(251,250,247,.7); transition: color var(--t2); }
.footer-col a:hover { color: var(--teal); }
.footer-bottom {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
  padding-top: 2rem; border-top: 1px solid rgba(251,250,247,.12);
  font-size: .76rem; color: rgba(251,250,247,.4);
}
.footer-bottom a { color: rgba(251,250,247,.6); }
.footer-bottom a:hover { color: var(--teal); }

/* ── Page hero (sub-pages, not full home hero) ─────────────── */
.page-hero { padding: calc(var(--nav-h) + 4.5rem) 0 4rem; border-bottom: 1px solid var(--line); }
.page-hero__kicker { font-family: var(--f-mono); font-size: .72rem; color: var(--teal-deep); letter-spacing: .1em; text-transform: uppercase; margin-bottom: 1rem; }

/* ── Stat blocks ────────────────────────────────────────────── */
.stat-block { display: flex; flex-direction: column; gap: .2rem; }
.stat-block .val { font-family: var(--f-display); font-size: 2.6rem; font-weight: 700; color: var(--ink); letter-spacing: -.02em; }
.stat-block .lbl { font-size: .78rem; color: var(--ink-faint); letter-spacing: .03em; }
.stat-block .note { font-family: var(--f-mono); font-size: .65rem; color: var(--ink-faint); margin-top: .15rem; }

/* ── Illustrative data disclaimer ──────────────────────────── */
.disclaimer {
  display: flex; gap: .6rem; align-items: flex-start;
  background: var(--gold-tint); border: 1px solid rgba(184,137,59,.22);
  border-radius: var(--r2); padding: .9rem 1.1rem;
  font-size: .82rem; color: var(--gold-deep); line-height: 1.55;
}

/* ── Form states (waitlist) ─────────────────────────────────── */
#waitlist-email.input--error { border-color: var(--red) !important; box-shadow: 0 0 0 3px var(--red-tint); }
.waitlist-success { opacity: 0; transition: opacity var(--t3) var(--ease); }
.waitlist-success.show { opacity: 1; }

/* ── Responsive grid utilities ──────────────────────────────── */
.g-2   { display: grid; grid-template-columns: 1fr 1fr; }
.g-3   { display: grid; grid-template-columns: repeat(3, 1fr); }
.g-4   { display: grid; grid-template-columns: repeat(4, 1fr); }
.g-2-uneven    { display: grid; grid-template-columns: 1.15fr .85fr; }
.g-2-uneven-r  { display: grid; grid-template-columns: .8fr 1.2fr; }
.g-founder     { display: grid; grid-template-columns: 320px 1fr; }

@media (max-width: 1024px) {
  .g-3, .g-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .g-2, .g-3, .g-4, .g-2-uneven, .g-2-uneven-r, .g-founder, .tab-panel { grid-template-columns: 1fr !important; }
}

/* ── Tables ─────────────────────────────────────────────────── */
.xc-table { width: 100%; border-collapse: collapse; }
.xc-table th, .xc-table td { text-align: left; padding: .9rem 1rem; border-bottom: 1px solid var(--line); font-size: .88rem; }
.xc-table th { font-family: var(--f-mono); font-size: .68rem; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-faint); font-weight: 500; }
.xc-table td { color: var(--ink-soft); }

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav__links { display: none; }
  .nav__links.open {
    display: flex; flex-direction: column;
    position: fixed; inset: var(--nav-h) 0 0 0;
    background: var(--paper);
    align-items: center; justify-content: center;
    gap: 2rem; z-index: 999;
  }
  .nav__links.open a { font-size: 1.2rem; }
  .nav__burger { display: flex; z-index: 1001; }
  #nav { padding: 0 1.25rem; }
  .wrap { padding: 0 1.25rem; }
  .section-pad { padding: 4rem 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 2.2rem; }
}