/* Project Tau: travertine, teak, foliage, glass. Shared by every page on projecttau.com. */
:root {
  --stone: #f1ece3;
  --stone-2: #e8e0d3;
  --ink: #1f2621;
  --ink-2: #4f4840;
  --ink-3: #7a6453; /* teak-grey: tertiary text */
  --rule: rgba(110, 84, 58, 0.18);
  --forest: #24392b;
  --forest-2: #2f4b37;
  --on-forest: #efe8dc;
  --on-forest-2: rgba(239, 232, 220, 0.72);
  --glass: rgba(250, 247, 241, 0.55);
  --display: "Bodoni Moda", Didot, "Bodoni 72", Georgia, serif;
  --sans: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --r: 20px;
  color-scheme: light;
}
* { box-sizing: border-box; }
html { background: var(--stone); scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--stone);
  color: var(--ink);
  font: 400 17px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; }

/* Four sizes: display 60, heading 32, body 17, small 14. Two weights: 400, 500. */
.display { font: 400 clamp(40px, 7vw, 60px) / 1.05 var(--display); letter-spacing: -0.01em; margin: 0; }
.heading { font: 400 32px / 1.15 var(--display); margin: 0; }
.small { font-size: 14px; line-height: 1.5; }
.eyebrow { font-size: 14px; color: var(--ink-3); margin: 0 0 12px; letter-spacing: 0.02em; }
.muted { color: var(--ink-2); }
p { margin: 0 0 12px; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
.prose { max-width: 60ch; }
section { padding: 96px 0; }

/* Glass: the only material. Frosted panel with a top sheen, no outline. */
.glass {
  background: var(--glass);
  backdrop-filter: blur(24px) saturate(1.3);
  -webkit-backdrop-filter: blur(24px) saturate(1.3);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7), 0 12px 40px rgba(36, 57, 43, 0.08);
  border-radius: var(--r);
}

/* Buttons: one primary per view. */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: 0 24px; border-radius: 999px;
  font: 500 14px/1 var(--sans); text-decoration: none; letter-spacing: 0.01em;
  background: var(--forest-2); color: var(--on-forest);
}
.btn:hover { background: var(--forest); }
.link { font-size: 14px; font-weight: 500; text-decoration: none; color: var(--forest-2); }
.link:hover { text-decoration: underline; text-underline-offset: 4px; }

/* Nav */
.nav { position: sticky; top: 12px; z-index: 10; margin: 12px auto 0; max-width: 1120px; padding: 0 16px; }
.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 8px 8px 8px 24px; border-radius: 999px; }
.wordmark { font: 400 32px/1 var(--display); text-decoration: none; letter-spacing: 0.01em; }
.nav-links { display: flex; gap: 32px; font-size: 14px; }
.nav-links a { text-decoration: none; color: var(--ink-2); }
.nav-links a:hover { color: var(--ink); }
.nav .btn { min-height: 40px; padding: 0 20px; }

/* Hero */
.hero { position: relative; overflow: hidden; padding: 64px 0 0; }
.hero::before {
  /* canopy: foliage light falling on stone */
  content: ""; position: absolute; inset: -20% -10% auto -10%; height: 120%; z-index: -1;
  background:
    radial-gradient(40% 35% at 85% 20%, rgba(47, 75, 55, 0.22), transparent 70%),
    radial-gradient(30% 30% at 10% 70%, rgba(139, 94, 60, 0.12), transparent 70%),
    radial-gradient(50% 40% at 70% 90%, rgba(47, 75, 55, 0.16), transparent 70%);
}
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px; align-items: center; }
.hero .lead { font-size: 17px; color: var(--ink-2); max-width: 44ch; margin: 24px 0 32px; }
.hero-actions { display: flex; gap: 24px; align-items: center; flex-wrap: wrap; }
.stage { position: relative; display: flex; justify-content: center; padding: 32px 0 0; }
.bubble { position: absolute; padding: 12px 16px; font-size: 14px; line-height: 1.4; max-width: 230px; }
.bubble b { display: block; font-weight: 500; color: var(--ink-3); margin-bottom: 4px; }
.b1 { left: -8%; top: 18%; }
.b2 { right: -10%; top: 46%; }
.b3 { left: -2%; bottom: 14%; }

/* Phone frame around real app screenshots */
.phone { width: 300px; max-width: 78vw; border-radius: 44px; padding: 10px; background: #161b17; box-shadow: 0 30px 80px rgba(36, 57, 43, 0.25); }
.phone img { border-radius: 34px; width: 100%; height: auto; aspect-ratio: 1000 / 2173; }
.phone.sm { width: 240px; border-radius: 36px; padding: 8px; }
.phone.sm img { border-radius: 28px; }

/* Sports strip (in place of a logo wall) */
.strip { padding: 48px 0; }
.strip-list { display: flex; flex-wrap: wrap; gap: 12px 40px; font: 400 32px/1.2 var(--display); color: var(--ink-3); margin: 0; padding: 0; list-style: none; }

/* Editorial photography under the sports strip */
.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 48px; }
.gallery figure { margin: 0; }
.gallery img { width: 100%; aspect-ratio: 4 / 5; object-fit: cover; border-radius: var(--r); }
.gallery figcaption { font-size: 14px; color: var(--ink-3); margin-top: 12px; }

/* Goal cards (in place of case studies) */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 48px; }
.card { padding: 24px; display: flex; flex-direction: column; gap: 12px; min-height: 260px; background: var(--stone-2); border-radius: var(--r); }
.card .goal { font: 400 32px/1.1 var(--display); margin: 0; }
.card .trains { font-size: 14px; color: var(--ink-3); margin: 0; }
.card p:last-child { margin-top: auto; color: var(--ink-2); font-size: 14px; }

/* Plan / Train / Adapt */
.cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 48px; margin-top: 48px; }
.col { display: flex; flex-direction: column; gap: 12px; }
.col h3 { font: 500 17px/1.3 var(--sans); margin: 24px 0 0; }
.col p { color: var(--ink-2); margin: 0; }
.col .phone { align-self: flex-start; }

/* Band */
.band { background: var(--stone-2); }
.band-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }

/* Tabs */
.tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; margin-top: 48px; }
.tab-list { display: flex; flex-direction: column; }
.tab { all: unset; cursor: pointer; padding: 24px 0; border-top: 1px solid var(--rule); }
.tab:last-child { border-bottom: 1px solid var(--rule); }
.tab-title { font: 500 17px/1.3 var(--sans); color: var(--ink-3); }
.tab[aria-selected="true"] .tab-title { color: var(--ink); }
.tab-body { display: none; color: var(--ink-2); margin: 8px 0 0; max-width: 46ch; }
.tab[aria-selected="true"] .tab-body { display: block; }
.tab:focus-visible { outline: 2px solid var(--forest-2); outline-offset: 4px; }
.tab-stage { display: flex; justify-content: center; }

/* Stats on forest */
.forest { background: var(--forest); color: var(--on-forest); }
.forest .eyebrow, .forest .muted { color: var(--on-forest-2); }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 48px; }
.stat { padding: 24px; border-radius: var(--r); background: rgba(239, 232, 220, 0.06); box-shadow: inset 0 1px 0 rgba(239, 232, 220, 0.12); }
.stat .num { font: 400 60px/1 var(--display); font-variant-numeric: tabular-nums lining-nums; margin: 0 0 12px; }
.stat p:last-child { color: var(--on-forest-2); font-size: 14px; margin: 0; }

/* Principles */
.principles { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px 48px; margin-top: 48px; }
.principles h3 { font: 500 17px/1.3 var(--sans); margin: 0 0 8px; }
.principles p { color: var(--ink-2); margin: 0; }

/* Download */
.download { text-align: center; padding: 128px 0; position: relative; overflow: hidden; }
.download::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: radial-gradient(50% 60% at 50% 100%, rgba(47, 75, 55, 0.2), transparent 70%);
}
.download .display { max-width: 16ch; margin: 0 auto 32px; }
.store { display: inline-flex; flex-direction: column; align-items: center; gap: 12px; }

/* Footer */
footer { padding: 48px 0 64px; border-top: 1px solid var(--rule); font-size: 14px; }
.foot { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; }
.foot h4 { font-size: 14px; font-weight: 500; margin: 0 0 12px; }
.foot ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.foot a { text-decoration: none; color: var(--ink-2); }
.foot a:hover { color: var(--ink); }
.copy { color: var(--ink-3); margin-top: 48px; }

/* Document pages (privacy, support) */
.doc { max-width: 68ch; margin: 0 auto; padding: 64px 16px 96px; }
.doc h1 { font: 400 32px/1.15 var(--display); margin: 0 0 8px; }
.doc h2 { font: 500 17px/1.3 var(--sans); margin: 32px 0 8px; }
.doc p, .doc li { color: var(--ink-2); }
.doc ul { padding-left: 20px; margin: 0 0 12px; }
.doc li { margin-bottom: 8px; }
.doc a { color: var(--forest-2); text-underline-offset: 3px; }
.meta { font-size: 14px; color: var(--ink-3); }
.doc nav { display: flex; gap: 24px; font-size: 14px; padding-top: 32px; margin-top: 48px; border-top: 1px solid var(--rule); }
.doc nav a { color: var(--ink-3); text-decoration: none; }

@media (max-width: 900px) {
  section { padding: 64px 0; }
  .nav-links { display: none; }
  .hero-grid, .band-grid, .tabs { grid-template-columns: 1fr; }
  .cards, .stats { grid-template-columns: repeat(2, 1fr); }
  .gallery { grid-template-columns: 1fr; }
  .gallery img { aspect-ratio: 3 / 2; }
  .cols { grid-template-columns: 1fr; }
  .col .phone { align-self: center; }
  .principles { grid-template-columns: 1fr; }
  .foot { grid-template-columns: 1fr 1fr; }
  .b1 { left: 0; } .b2 { right: 0; } .b3 { left: 4%; }
}
@media (max-width: 520px) {
  .cards, .stats { grid-template-columns: 1fr; }
  .bubble { max-width: 190px; }
}
@media (prefers-reduced-motion: no-preference) {
  .bubble { animation: float 6s ease-in-out infinite; }
  .b2 { animation-delay: -2s; } .b3 { animation-delay: -4s; }
  @keyframes float { 50% { transform: translateY(-6px); } }
}