/* ============================================================
   OncoHub — Shared design system
   Used by index.html (landing) and hasta.html (patient page)
   ============================================================ */

:root {
  /* Brand */
  --green: #05D893;
  --green-2: #7FE8C4;
  --green-soft: rgba(5, 216, 147, 0.10);

  /* Surfaces (deep teal) */
  --bg: #002523;
  --bg-2: #002F2C;
  --bg-3: #003430;

  /* Ink */
  --ink: #E8F7F2;
  --ink-dim: #9FC5BC;
  --ink-faint: #5E817A;

  /* Lines */
  --line: rgba(232, 247, 242, 0.10);
  --line-strong: rgba(5, 216, 147, 0.35);

  /* Radii */
  --radius: 18px;
  --radius-sm: 12px;

  /* Layout */
  --maxw: 1200px;
  --nav-h: 72px;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection { background: rgba(5, 216, 147, 0.28); color: #fff; }

a { color: inherit; text-decoration: none; }
img, svg, canvas { display: block; max-width: 100%; }

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-family: 'Fraunces', Georgia, serif;
  margin: 0;
  letter-spacing: -0.01em;
  color: var(--ink);
}
h1 { font-size: clamp(40px, 6vw, 82px); line-height: 1.04; }
h2 { font-size: clamp(28px, 3.6vw, 52px); line-height: 1.1; }
h3 { font-size: clamp(22px, 2.2vw, 36px); line-height: 1.15; }
p  { margin: 0; }

.mono { font-family: 'JetBrains Mono', ui-monospace, monospace; }
.g { color: var(--green); }

.eyebrow {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 32px;
}
section[id], header[id] { scroll-margin-top: calc(var(--nav-h) + 16px); }

@media (max-width: 600px) {
  .container { padding-inline: 20px; }
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 32px;
  border-bottom: 1px solid transparent;
  transition: background 0.3s, border-color 0.3s, backdrop-filter 0.3s;
}
.nav.scrolled {
  background: rgba(0, 37, 35, 0.78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}
.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-weight: 700;
  font-size: 18.5px;
  letter-spacing: -0.01em;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-links a {
  font-size: 14px;
  color: var(--ink-dim);
  transition: color 0.2s;
  position: relative;
}
.nav-links a:hover,
.nav-links a.active,
.nav-links a[data-spy].active { color: var(--green); }
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  font-size: 14px;
  color: var(--ink);
  transition: background 0.2s, border-color 0.2s;
}
.nav-cta:hover { background: var(--green-soft); border-color: var(--green); }

@media (max-width: 720px) {
  .nav { padding: 0 20px; gap: 12px; }
  .nav-links { gap: 16px; }
  .nav-links a { font-size: 13px; }
  .nav-cta { padding: 8px 14px; }
}
@media (max-width: 520px) {
  .nav-links { display: none; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 13px 22px;
  border-radius: 999px;
  font-family: inherit;
  font-size: 14.5px;
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.2s, border-color 0.2s, transform 0.2s, color 0.2s;
  white-space: nowrap;
}
.btn .arrow {
  width: 14px; height: 14px;
  transition: transform 0.2s;
}
.btn:hover .arrow { transform: translateX(3px); }
.btn-primary {
  background: var(--green);
  color: #00231F;
  font-weight: 600;
}
.btn-primary:hover { background: #06EBA0; transform: translateY(-1px); }
.btn-ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--ink);
}
.btn-ghost:hover { background: var(--green-soft); border-color: var(--green); }

/* ---------- Reveal on scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.8s cubic-bezier(.2,.7,.2,1), transform 0.8s cubic-bezier(.2,.7,.2,1);
  will-change: opacity, transform;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-2);
  padding: 64px 0 56px;
}
.site-footer .container {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}
.site-footer .meta {
  color: var(--ink-dim);
  font-size: 13.5px;
  line-height: 1.7;
  max-width: 420px;
}
.site-footer .meta strong { color: var(--ink); font-weight: 600; }
.site-footer .legal {
  text-align: right;
  color: var(--ink-faint);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.9;
}
@media (max-width: 640px) {
  .site-footer .container { flex-direction: column; }
  .site-footer .legal { text-align: left; }
}

/* ---------- Motion preferences ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}