/* ==========================================================================
   ABF Conference — Base Styles
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body { margin: 0; font-family: var(--font-sans); color: var(--color-ink-800); background: var(--color-bg); font-size: var(--text-base); line-height: 1.55; }

h1, h2, h3, h4, h5, h6 { margin: 0; font-family: var(--font-display); color: var(--color-ink-900); line-height: 1.2; font-weight: 700; letter-spacing: -0.01em; }
h1 { font-size: var(--text-5xl); letter-spacing: -0.025em; }
h2 { font-size: var(--text-3xl); letter-spacing: -0.02em; }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
p  { margin: 0; }

a { color: var(--color-primary-600); text-decoration: none; transition: color var(--duration-fast) var(--ease-out); }
a:hover { color: var(--color-primary-700); }

img, svg { display: block; max-width: 100%; }

/* Inline icon size helpers (apply on all viewports) */
.i { width: 16px; height: 16px; flex-shrink: 0; }
.i-lg { width: 20px; height: 20px; flex-shrink: 0; }
.i-xl { width: 28px; height: 28px; flex-shrink: 0; }

ul, ol { margin: 0; padding: 0; list-style: none; }

button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; font-size: inherit; }

::selection { background: var(--color-primary-200); color: var(--color-ink-900); }

/* ---------- Container ---------- */
.container { width: 100%; max-width: var(--container-max); margin: 0 auto; padding-inline: var(--container-pad); }

/* ---------- Section ---------- */
.section { padding: var(--space-20) 0; }
.section-sm { padding: var(--space-12) 0; }
.section-tinted { background: var(--color-bg-tinted); }
.section-dark { background: var(--color-ink-900); color: var(--color-ink-100); }

.eyebrow { display: inline-block; font: 600 var(--text-xs)/1 var(--font-sans); letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-primary-600); margin-bottom: var(--space-4); }
.page-eyebrow { display: inline-block; font: 700 clamp(2rem, 4vw, 3rem)/1.15 var(--font-sans); letter-spacing: -0.01em; text-transform: none; color: var(--color-primary-600); margin-bottom: var(--space-3); }
.section-title { font-size: clamp(1.75rem, 3vw, var(--text-3xl)); margin-bottom: var(--space-3); }
.section-lead  { color: var(--color-ink-500); font-size: var(--text-md); max-width: 60ch; }

/* ---------- Header ---------- */
.site-header { position: sticky; top: 0; z-index: var(--z-header); background: rgba(255,255,255,0.92); backdrop-filter: saturate(140%) blur(12px); -webkit-backdrop-filter: saturate(140%) blur(12px); border-bottom: 1px solid var(--color-border); }
.site-header__inner { display: flex; align-items: center; height: var(--header-h); gap: var(--space-8); }
.brand { display: inline-flex; align-items: center; gap: var(--space-3); font-weight: 800; color: var(--color-ink-900); height: 100%; flex: 1 1 0; min-width: 0; }
.brand__mark { width: 36px; height: 36px; border-radius: 9px; background: linear-gradient(135deg, var(--color-primary-600) 0%, var(--color-primary-800) 100%); display: grid; place-items: center; color: #fff; font-weight: 800; font-size: 14px; letter-spacing: 0.04em; box-shadow: var(--shadow-glow); flex-shrink: 0; }
.brand__logo { display: flex; align-items: center; height: 100%; width: 100%; }
.brand__logo img { height: 100%; width: 100%; display: block; object-fit: contain; }
.brand__logo--footer { height: 48px; width: auto; max-width: 100%; }
.brand__logo--footer img { height: 100%; width: auto; display: block; }
.brand__name { font-size: var(--text-md); line-height: 1.1; }
.brand__sub  { display: block; font-size: 10px; letter-spacing: 0.18em; color: var(--color-ink-500); text-transform: uppercase; font-weight: 600; }

.primary-nav { display: flex; align-items: center; gap: var(--space-2); flex-shrink: 0; }
.primary-nav a { color: var(--color-ink-700); font-size: var(--text-sm); font-weight: 500; padding: 8px 12px; border-radius: var(--radius-sm); transition: background var(--duration-fast), color var(--duration-fast); }
.primary-nav a:hover { background: var(--color-bg-tinted); color: var(--color-ink-900); }
.primary-nav a.is-active { color: var(--color-primary-700); background: var(--color-primary-50); }

.header-actions { margin-left: auto; display: flex; align-items: center; gap: var(--space-3); }
.header-icon { width: 38px; height: 38px; border-radius: var(--radius-sm); display: grid; place-items: center; color: var(--color-ink-600); border: 1px solid transparent; }
.header-icon:hover { background: var(--color-bg-tinted); color: var(--color-ink-900); }

/* Mobile menu trigger */
.menu-toggle { display: none; width: 44px; height: 44px; border: 1px solid var(--color-border); border-radius: var(--radius-sm); background: #fff; align-items: center; justify-content: center; }
.menu-toggle span { display: block; width: 18px; height: 2px; background: var(--color-ink-800); position: relative; }
.menu-toggle span::before, .menu-toggle span::after { content: ''; position: absolute; left: 0; width: 18px; height: 2px; background: var(--color-ink-800); }
.menu-toggle span::before { top: -6px; } .menu-toggle span::after { top: 6px; }

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  background: linear-gradient(180deg, var(--color-ink-900) 0%, #0A101A 100%);
  color: var(--color-ink-300);
  padding: var(--space-16) 0 var(--space-8);
  margin-top: var(--space-20);
  overflow: hidden;
}
.site-footer::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary-500) 0%, var(--color-primary-400) 35%, var(--color-accent-500) 100%);
}
.site-footer::after {
  content: '';
  position: absolute;
  top: -180px; right: -120px;
  width: 380px; height: 380px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(14,124,58,0.16) 0%, rgba(14,124,58,0) 70%);
  pointer-events: none;
}
.site-footer .container { position: relative; }
.site-footer h4 {
  color: #fff;
  font-size: var(--text-2xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: var(--space-5);
  display: flex;
  align-items: center;
  gap: 8px;
}
.site-footer h4::before {
  content: '';
  width: 12px;
  height: 2px;
  border-radius: 1px;
  background: var(--color-accent-500);
  flex-shrink: 0;
}
.site-footer a { color: var(--color-ink-300); }
.site-footer a:hover { color: var(--color-accent-400); }

.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr 1.2fr; gap: var(--space-10); margin-bottom: var(--space-10); padding-bottom: var(--space-10); border-bottom: 1px solid rgba(255,255,255,0.08); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-ink-500);
  letter-spacing: 0.01em;
}
.footer-bottom span:last-child {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-ink-600);
  background: rgba(255,255,255,0.04);
  padding: 3px 8px;
  border-radius: var(--radius-full);
}

.footer-brand { color: var(--color-ink-300); font-size: var(--text-sm); line-height: 1.7; max-width: 30ch; margin-top: var(--space-3); }

.footer-list li { margin-bottom: 11px; font-size: var(--text-sm); }
.footer-list a {
  position: relative;
  transition: color var(--duration-fast) var(--ease-out), padding-left var(--duration-fast) var(--ease-out);
}
.footer-list a::before {
  content: '';
  position: absolute;
  left: -14px;
  top: 50%;
  width: 5px;
  height: 1px;
  background: var(--color-accent-500);
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-out), left var(--duration-fast) var(--ease-out);
}
.footer-list a:hover { padding-left: 10px; }
.footer-list a:hover::before { opacity: 1; left: -2px; }

.footer-list li:not(:has(a)) {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-ink-300);
}
.footer-list li:not(:has(a))::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary-500);
  flex-shrink: 0;
}

.footer-social { display: flex; gap: var(--space-2); }
.footer-social a { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 8px; background: rgba(255,255,255,0.06); transition: background var(--duration-fast) var(--ease-out), transform var(--duration-fast) var(--ease-out); }
.footer-social a:hover { background: var(--color-primary-600); color: #fff; transform: translateY(-2px); }

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.flex { display: flex; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

/* ---------- Mobile-only rules shared across pages ---------- */
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: var(--space-3); text-align: center; }
}