/* ================================================================
   HEAD.CSS — Ukubona × WHO India
   Global layout, header, nav, grid, typography, links.
   All spacing derived from var(--header-h) in variables.css.
   Never hardcode px offsets for header clearance here.
   ================================================================ */

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }

body {
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  transition: var(--transition);
  font-size: 16px;
}

/* ── Wrap helper ── */
.wrap-max {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ── Background animation ── */
.bg-pattern { position: fixed; inset: 0; z-index: -2; background: var(--bg); }
.bg-pattern::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(102,126,234,.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(118,75,162,.08)  0%, transparent 50%),
    radial-gradient(circle at 40% 60%, rgba(240,147,251,.06) 0%, transparent 50%);
  animation: bgFloat 20s ease-in-out infinite;
}
@keyframes bgFloat {
  0%,100% { transform: translate(0,0) rotate(0deg); }
  33%      { transform: translate(-20px,-20px) rotate(.8deg); }
  66%      { transform: translate(20px,-10px) rotate(-.8deg); }
}

/* ── Scroll indicator ── */
.scroll-indicator {
  position: fixed; top: 0; left: 0;
  width: 100%; height: 3px; z-index: 1001;
  background: var(--glass);
}
.scroll-progress {
  height: 100%; width: 0%;
  background: var(--primary-gradient);
  transition: width .15s linear;
}

/* ── Header ── */
.header {
  position: fixed; top: 0; left: 0;
  width: 100%; z-index: 100;
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  min-height: var(--header-h);
}

.nav-container {
  max-width: var(--max-wrap);
  margin: 0 auto;
  padding: 0 2rem;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ── Logo ── */
#logo.logo {
  /* width: var(--logo-size); */
  /* height: var(--logo-size); */
  /* just hardcoded for reliability */
  width: 120px !important;
  height: 120px !important;
  object-fit: contain;
  transform-origin: center;
  animation: spin var(--logo-spin-duration) linear infinite;
  display: block;
  will-change: transform;
  filter: drop-shadow(0 0 8px rgba(255,255,255,.15));
  flex-shrink: 0;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Nav links ── */
.nav-links {
  display: flex; list-style: none;
  gap: 2rem; margin: 0; padding: 0;
}
.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: .85rem;
  letter-spacing: .04em;
  transition: var(--transition);
  position: relative;
}
.nav-link::after {
  content: ''; position: absolute; bottom: -3px; left: 0;
  width: 0; height: 2px;
  background: var(--primary-gradient);
  transition: width .3s ease;
}
.nav-link:hover { color: var(--text); }
.nav-link:hover::after { width: 100%; }

/* ── Top-right cluster ── */
.top-right { display: flex; align-items: center; gap: .75rem; }

/* ── Menu icon ── */
.menu-icon {
  display: grid; grid-template-columns: repeat(3,6px); gap: 3px;
  padding: 8px; background: var(--glass); border: 1px solid var(--border);
  border-radius: 8px; cursor: pointer; transition: var(--transition);
}
.menu-icon div {
  width: 6px; height: 6px;
  background: var(--text); border-radius: 50%;
  transition: var(--transition);
}
.menu-icon:hover { background: var(--primary-gradient); transform: scale(1.05); }
.menu-icon:hover div { background: #fff; }

/* ── Theme toggle ── */
#toggle-theme {
  padding: 7px 11px;
  background: var(--glass); border: 1px solid var(--border);
  border-radius: 8px; cursor: pointer; font-size: 15px;
  transition: var(--transition); line-height: 1;
}
#toggle-theme:hover { background: var(--secondary-gradient); color: #fff; transform: scale(1.05); }

/* ── App grid (hamburger panel) ── */
.app-grid {
  position: fixed;
  top: calc(var(--header-h) + 10px);   /* always 10px below header */
  right: 2rem;
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: .75rem;
  padding: 1.25rem;
  background: var(--surface);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  width: min(380px, calc(100vw - 3rem));
  z-index: 2000;
  max-height: 80vh;
  overflow-y: auto;
  overscroll-behavior: contain;

  /* hidden by default */
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-12px) scale(.96);
  transition: var(--transition);
}
.app-grid.active {
  opacity: 1; visibility: visible;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

/* scrollbar */
.app-grid::-webkit-scrollbar { width: 6px; }
.app-grid::-webkit-scrollbar-track { background: transparent; }
.app-grid::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,.18); border-radius: 3px;
}
.app-grid::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,.35); }

/* grid links */
.app-grid a {
  display: flex; flex-direction: column; align-items: center;
  gap: .45rem; padding: .85rem .6rem;
  text-decoration: none; color: var(--text);
  background: var(--glass); border: 1px solid var(--border);
  border-radius: 12px;
  font-family: 'Inter', sans-serif; font-size: .62rem;
  font-weight: 500; letter-spacing: .04em;
  text-align: center; line-height: 1.35;
  transition: var(--transition);
}
.app-grid a:hover {
  background: var(--primary-gradient); color: #fff;
  border-color: transparent; transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(102,126,234,.3);
}
.app-grid a:hover .icon-box { background: rgba(255,255,255,.15); border-color: transparent; }

/* icon boxes */
.icon-box {
  font-size: 1.1rem;
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  background: var(--glass); border: 1px solid var(--border);
  border-radius: 8px; transition: var(--transition);
  flex-shrink: 0;
}

/* ── Page content clearance ── */
.page {
  padding-top: calc(var(--header-h) + var(--space-xl));
  padding-bottom: var(--space-2xl);
}

/* ── Card typography ── */
.card h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  margin-bottom: var(--space-lg);
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -.02em;
  text-align: left;
}

.card h2 {
  font-size: clamp(1.2rem, 3vw, 1.75rem);
  font-weight: 700;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-md);
  color: var(--text);
  border-left: 4px solid var(--accent-blue);
  padding-left: var(--space-md);
  text-align: left;
}

.card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: var(--space-md);
  margin-bottom: var(--space-sm);
  color: var(--text);
  text-align: left;
}

.card p {
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
  line-height: 1.75;
}

.card ul, .card ol {
  margin-left: var(--space-lg);
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
}
.card li { margin-bottom: var(--space-xs); line-height: 1.7; }

.card code {
  background: var(--glass);
  padding: 2px 6px; border-radius: 4px;
  font-family: 'DM Mono', 'Courier New', monospace;
  font-size: .88em; color: var(--accent-blue);
}

.card pre {
  background: var(--glass);
  padding: var(--space-md);
  border-radius: var(--radius);
  overflow-x: auto;
  margin-bottom: var(--space-md);
}
.card pre code { background: none; padding: 0; color: var(--text); }

/* ── Link styles ── */
.card a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  background:
    linear-gradient(135deg,
      rgba(102,126,234,.7),
      rgba(118,75,162,.7)) left bottom / 0% 1.5px no-repeat;
  transition: background-size .3s cubic-bezier(.4,0,.2,1), color .3s ease;
}
.card a:hover {
  background-size: 100% 1.5px;
  color: #667eea;
}

/* Footer links — override card link animation */
.footer a,
.footer-micro a,
#footer-placeholder a {
  color: var(--text-secondary) !important;
  text-decoration: none !important;
  border-bottom: 1px solid transparent !important;
  background: none !important;
  transition: var(--transition) !important;
}
.footer a:hover,
.footer-micro a:hover,
#footer-placeholder a:hover {
  color: #667eea !important;
  border-bottom-color: rgba(102,126,234,.4) !important;
}

/* Figcaption links */
figcaption a {
  color: inherit; text-decoration: none;
  position: relative; opacity: .85; background: none !important;
}
figcaption a::after {
  content: ''; position: absolute; bottom: -1px; left: 0;
  width: 0; height: 1px;
  background: currentColor; opacity: .5;
  transition: width .3s ease;
}
figcaption a:hover { opacity: 1; }
figcaption a:hover::after { width: 100%; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .nav-links { display: none; }

  .app-grid {
    top: calc(var(--header-h) + 10px);
    right: 1rem; left: 1rem;
    width: auto;
    grid-template-columns: repeat(2,1fr);
  }

  .wrap-max { padding: 0 var(--space-md); }

  .card { padding: var(--space-lg); }
  .card h1 { font-size: 1.75rem; }
  .card h2 { font-size: 1.35rem; }

  /* Safari gradient text fallback on mobile */
  .card h1 {
    -webkit-text-fill-color: var(--text);
    color: var(--text);
    background: none;
    -webkit-background-clip: initial;
    background-clip: initial;
  }
}

@media (max-width: 400px) {
  .app-grid { padding: 1rem; gap: .5rem; }
  .icon-box { width: 30px; height: 30px; font-size: .95rem; }
}