/* ── Shared Habitra design tokens lifted from globals.css ────────── */
:root {
  --bg-c:           0.18 0.006 60;
  --surface-c:      0.22 0.006 60;
  --surface-2-c:    0.255 0.006 60;
  --surface-3-c:    0.29 0.006 60;
  --border-c:       0.32 0.006 60;
  --border-strong-c:0.38 0.006 60;

  --fg-c:      0.97 0.006 90;
  --fg-dim-c:  0.85 0.006 80;
  --muted-c:   0.64 0.006 70;
  --subtle-c:  0.50 0.006 70;

  --ok-c:       0.74 0.14 155;
  --info-c:     0.72 0.14 240;
  --warn-c:     0.78 0.14 70;
  --critical-c: 0.68 0.20 25;

  --bg:            oklch(var(--bg-c));
  --surface:       oklch(var(--surface-c));
  --surface-2:     oklch(var(--surface-2-c));
  --surface-3:     oklch(var(--surface-3-c));
  --border:        oklch(var(--border-c) / 0.6);
  --border-strong: oklch(var(--border-strong-c) / 0.8);
  --hairline:      oklch(var(--border-c) / 0.22);

  --fg:     oklch(var(--fg-c));
  --fg-dim: oklch(var(--fg-dim-c));
  --muted:  oklch(var(--muted-c));
  --subtle: oklch(var(--subtle-c));

  --ok: oklch(var(--ok-c));
  --info: oklch(var(--info-c));
  --warn: oklch(var(--warn-c));
  --critical: oklch(var(--critical-c));

  --accent: #7aa5e8;
  --streak: #f0a646;

  --radius-sm: 6px;
  --radius:    10px;
  --radius-lg: 14px;

  --font-sans:  "Inter Tight", ui-sans-serif, system-ui, sans-serif;
  --font-mono:  "JetBrains Mono", ui-monospace, monospace;
  --font-serif: "Fraunces", Georgia, serif;
}

html.light {
  --bg-c:           0.96 0.006 60;
  --surface-c:      0.99 0.004 60;
  --surface-2-c:    0.93 0.008 55;
  --surface-3-c:    0.88 0.010 52;
  --border-c:       0.72 0.010 52;
  --border-strong-c:0.58 0.014 50;

  --fg-c:      0.18 0.008 50;
  --fg-dim-c:  0.32 0.010 55;
  --muted-c:   0.48 0.010 55;
  --subtle-c:  0.62 0.010 55;

  --border:       oklch(var(--border-c) / 0.55);
  --border-strong:oklch(var(--border-strong-c) / 0.9);
  --hairline:     oklch(var(--border-c) / 0.35);
}

html { color-scheme: dark; }
html.light { color-scheme: light; }

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  letter-spacing: -0.003em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* faint grid */
body::before {
  content: "";
  position: fixed; inset: 0;
  background-image:
    linear-gradient(to right, var(--hairline) 1px, transparent 1px),
    linear-gradient(to bottom, var(--hairline) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.4;
  pointer-events: none;
  z-index: 0;
  mask-image: radial-gradient(ellipse at top, black 25%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at top, black 25%, transparent 80%);
}

a { color: inherit; }

.kicker {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--subtle);
  font-weight: 500;
}
.micro {
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}

.wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
  position: relative;
  z-index: 1;
}
@media (max-width: 640px) { .wrap { padding: 0 20px; } }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all 160ms ease;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--fg-dim);
  text-decoration: none;
  white-space: nowrap;
}
.btn:hover { background: var(--surface-2); border-color: var(--border-strong); color: var(--fg); transform: translateY(-1px); }
.btn.primary { background: var(--fg); color: var(--bg); border-color: var(--fg); }
.btn.primary:hover { opacity: 0.9; }
.btn.ghost { background: transparent; }

/* Section heads */
.section-head { display: flex; flex-direction: column; gap: 8px; margin-bottom: 48px; max-width: 720px; }
.section-head h2 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(34px, 4.4vw, 52px);
  letter-spacing: -0.022em;
  line-height: 1.05;
  margin: 0;
  color: var(--fg);
}
.section-head p { margin: 0; color: var(--muted); font-size: 16px; max-width: 56ch; }

/* Page header (large title for inner pages) */
.page-head {
  padding: 80px 0 48px;
  border-bottom: 1px solid var(--hairline);
  margin-bottom: 64px;
}
.page-head .kicker { color: var(--accent); }
.page-head h1 {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(48px, 7vw, 88px);
  line-height: 0.98;
  letter-spacing: -0.03em;
  color: var(--fg);
}
.page-head h1 em {
  font-style: italic;
  color: var(--accent);
}
.page-head p {
  margin-top: 20px;
  font-size: 17px;
  color: var(--muted);
  max-width: 56ch;
  line-height: 1.55;
}

/* Animations */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes pulse-ring {
  0%,100% { box-shadow: 0 0 0 0 oklch(var(--fg-c) / 0.25); }
  60%     { box-shadow: 0 0 0 12px oklch(var(--fg-c) / 0); }
}
@keyframes dot-fill-anim {
  from { transform: scale(0.6); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}
@keyframes shimmer {
  0% { background-position: -120% 0; }
  100% { background-position: 220% 0; }
}
@keyframes float-y {
  0%,100% { transform: translateY(0); }
  50%     { transform: translateY(-6px); }
}
@keyframes ring-rotate {
  to { transform: rotate(360deg); }
}
@keyframes streak-spark {
  0%   { transform: scale(0) rotate(0deg); opacity: 0; }
  40%  { transform: scale(1.1) rotate(180deg); opacity: 1; }
  100% { transform: scale(1) rotate(360deg); opacity: 1; }
}

.fade-up { opacity: 0; animation: fade-up 700ms ease-out both; }
.fade-up.d1 { animation-delay: 80ms; }
.fade-up.d2 { animation-delay: 160ms; }
.fade-up.d3 { animation-delay: 240ms; }
.fade-up.d4 { animation-delay: 320ms; }
.fade-up.d5 { animation-delay: 400ms; }

/* Reveal-on-scroll */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity 700ms ease, transform 700ms cubic-bezier(.2,.8,.2,1); }
.reveal.in { opacity: 1; transform: translateY(0); }

/* ───────── Nav ───────── */
.nav {
  position: sticky; top: 0; z-index: 30;
  background: oklch(var(--bg-c) / 0.78);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  border-bottom: 1px solid var(--hairline);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-name {
  font-weight: 700; font-size: 17px; letter-spacing: -0.02em;
  color: var(--fg);
  font-family: var(--font-sans);
}
.nav-links { display: flex; gap: 2px; padding: 4px; border-radius: 999px; background: oklch(var(--surface-c) / 0.5); border: 1px solid var(--hairline); }
.nav-link {
  position: relative;
  padding: 7px 14px; border-radius: 999px;
  font-size: 13px; color: var(--muted);
  text-decoration: none; font-weight: 500;
  transition: color 140ms;
}
.nav-link:hover { color: var(--fg); }
.nav-link.active {
  color: var(--fg);
  background: var(--surface-2);
  box-shadow: 0 1px 2px oklch(0 0 0 / 0.1);
}
@media (max-width: 820px) { .nav-links { display: none; } }
.nav-cta { display: flex; gap: 8px; align-items: center; }

.theme-toggle {
  width: 32px; height: 32px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--muted);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: all 200ms;
}
.theme-toggle:hover { background: var(--surface-2); color: var(--fg); transform: rotate(15deg); }

/* Mobile menu */
.mobile-menu-btn {
  display: none;
  width: 36px; height: 32px; border-radius: var(--radius-sm);
  background: var(--surface); border: 1px solid var(--border);
  color: var(--fg-dim);
  align-items: center; justify-content: center;
  cursor: pointer;
}
@media (max-width: 820px) { .mobile-menu-btn { display: flex; } .nav-cta .btn:not(.primary) { display:none; } }

.mobile-drawer {
  position: fixed; top: 64px; left: 0; right: 0;
  background: oklch(var(--bg-c) / 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 16px 32px 24px;
  z-index: 25;
  display: flex; flex-direction: column; gap: 4px;
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
  transition: transform 280ms cubic-bezier(.2,.8,.2,1), opacity 200ms;
}
.mobile-drawer.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
.mobile-drawer a {
  padding: 14px 4px;
  font-size: 16px; font-weight: 500;
  color: var(--fg-dim);
  text-decoration: none;
  border-bottom: 1px solid var(--hairline);
}
.mobile-drawer a.active { color: var(--accent); }

/* ───────── Footer ───────── */
footer {
  border-top: 1px solid var(--hairline);
  margin-top: 120px;
  padding: 64px 0 36px;
  background: oklch(var(--surface-c) / 0.4);
  position: relative;
  z-index: 1;
}
.foot-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 48px;
}
@media (max-width: 760px) { .foot-grid { grid-template-columns: 1fr 1fr; gap: 32px; } }
.foot-grid h4 {
  font-family: var(--font-mono);
  font-size: 10.5px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--subtle); font-weight: 500;
  margin: 0 0 14px;
}
.foot-grid ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.foot-grid a {
  color: var(--fg-dim);
  text-decoration: none;
  font-size: 13.5px;
  transition: color 140ms;
}
.foot-grid a:hover { color: var(--fg); }
.foot-copy {
  margin-top: 56px; padding-top: 24px;
  border-top: 1px solid var(--hairline);
  display: flex; justify-content: space-between; align-items: center;
  color: var(--subtle); font-size: 12px;
  font-family: var(--font-mono);
}
@media (max-width: 600px) { .foot-copy { flex-direction: column; gap: 8px; } }