/* Nexus MUN Portal - static, no dependencies. Mobile-first. */

:root {
  color-scheme: light dark;
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --primary: #1d4ed8;
  --primary-hover: #1e40af;
  --primary-soft: #dbeafe;
  --border: #e2e8f0;
  --radius: 14px;
  --max: 1080px;
  --focus: #f59e0b;
  --header-bg: rgba(255,255,255,0.92);
  --btn-bg: #1d4ed8;
  --btn-bg-hover: #1e40af;
  --btn-text: #ffffff;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f172a;
  --surface: #1e293b;
  --text: #f1f5f9;
  --muted: #cbd5e1;
  --primary: #60a5fa;
  --primary-hover: #93c5fd;
  --primary-soft: #1e3a8a;
  --border: #334155;
  --header-bg: rgba(15,23,42,0.92);
  --btn-bg: #2563eb;
  --btn-bg-hover: #1d4ed8;
  --btn-text: #ffffff;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 96px; }
section[id] { scroll-margin-top: 96px; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
body p { margin: 0 0 1rem; }
body p:last-child { margin-bottom: 0; }

.container { width: min(100% - 2rem, var(--max)); margin-inline: auto; }
.narrow { max-width: 720px; }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--btn-bg); color: var(--btn-text); padding: 0.75rem 1rem; z-index: 100;
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--header-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 200ms ease, background 200ms ease;
}
.site-header.is-scrolled {
  box-shadow: 0 4px 18px rgba(15,23,42,0.1);
  background: var(--surface);
}
.site-header.is-scrolled .header-inner { padding: 0.35rem 0; }
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 0.6rem 0.8rem; padding: 0.6rem 0; flex-wrap: wrap;
}
.brand { display: inline-flex; align-items: center; gap: 0.55rem; text-decoration: none; color: var(--text); font-weight: 700; font-size: 1.05rem; margin-right: auto; }
.brand img { display: block; border-radius: 50%; }

.site-nav { display: flex; gap: 0.15rem; flex-wrap: wrap; align-items: center; }
.site-nav a {
  text-decoration: none; color: var(--muted);
  padding: 0.55rem 0.7rem; border-radius: 10px; min-height: 44px;
  display: inline-flex; align-items: center; font-weight: 600; white-space: nowrap;
}
.site-nav a:hover { background: var(--primary-soft); color: var(--primary); }

.theme-cycle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--surface); color: var(--muted);
  cursor: pointer; flex: 0 0 auto; padding: 0;
}
.theme-cycle:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }
.theme-cycle-icon { display: inline-flex; }

@media (max-width: 720px) {
  html { scroll-padding-top: 132px; }
  section[id] { scroll-margin-top: 132px; }
  .site-nav { order: 3; width: 100%; overflow-x: auto; flex-wrap: nowrap; padding-bottom: 0.15rem; }
  .brand { font-size: 1rem; }
}

.hero { background: var(--surface); border-bottom: 1px solid var(--border); }
.hero-inner { padding: 3.5rem 0; max-width: 760px; }
.eyebrow {
  display: inline-block; font-weight: 700; font-size: 0.85rem;
  color: var(--primary); background: var(--primary-soft);
  padding: 0.3rem 0.7rem; border-radius: 999px; margin: 0 0 1rem;
}
.hero h1 { font-size: clamp(1.9rem, 4vw, 2.9rem); line-height: 1.15; margin: 0 0 1rem; letter-spacing: -0.02em; }
.lead { font-size: 1.12rem; color: var(--muted); margin: 0 0 1.6rem; }

.hero-actions { display: flex; gap: 0.75rem; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  min-height: 48px; padding: 0.8rem 1.4rem; border-radius: 12px;
  font-weight: 700; text-decoration: none; border: 1px solid transparent;
  transition: background 180ms ease, transform 180ms ease, border-color 180ms ease;
}
.btn-primary { background: var(--btn-bg); color: var(--btn-text); }
.btn-primary:hover { background: var(--btn-bg-hover); }
.btn-secondary { background: var(--surface); color: var(--primary); border-color: var(--border); }
.btn-secondary:hover { border-color: var(--primary); background: var(--primary-soft); }
.btn[disabled], .btn[aria-disabled="true"] { opacity: 0.6; cursor: not-allowed; }

a:focus-visible, button:focus-visible {
  outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 8px;
}

.section { padding: 3rem 0; }
.section h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin: 0 0 0.6rem; letter-spacing: -0.01em; }
.section-desc { color: var(--muted); margin: 0 0 1.8rem; max-width: 640px; }

.cards-grid {
  display: grid; gap: 1.2rem;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}
.cards-grid:has(> :only-child) { max-width: 560px; }

.empty-state {
  border: 1px dashed var(--border); border-radius: var(--radius);
  padding: 1.5rem; color: var(--muted); background: var(--surface);
}
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.5rem; display: flex; flex-direction: column; gap: 1rem;
  box-shadow: 0 1px 2px rgba(15,23,42,0.06);
}
.card-top { display: flex; align-items: center; gap: 0.9rem; }
.card-icon {
  width: 48px; height: 48px; flex: 0 0 48px; border-radius: 12px;
  background: var(--primary-soft); color: var(--primary);
  display: inline-flex; align-items: center; justify-content: center;
}
.card h3 { margin: 0; font-size: 1.25rem; }
.card p { margin: 0; color: var(--muted); }
.card-actions { margin-top: 0.5rem; display: flex; flex-direction: column; gap: 0.75rem; }
.card-link { width: 100%; }
.pending-badge {
  display: inline-block; font-size: 0.82rem; font-weight: 700;
  background: #fef3c7; color: #92400e; border: 1px solid #fde68a;
  padding: 0.25rem 0.6rem; border-radius: 999px;
}
.pending-note { font-size: 0.9rem; color: var(--muted); }

.proyecto { background: var(--surface); border-block: 1px solid var(--border); }
.feature-list { padding-left: 1.1rem; margin: 1.25rem 0 0; display: grid; gap: 0.75rem; }

.contacto-box {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 2rem; text-align: center;
}
.contacto-box .btn { margin-top: 1rem; word-break: break-all; }

.config-note {
  margin-top: 1.2rem; background: #fffbeb; border: 1px solid #fde68a;
  padding: 0.8rem 1rem; border-radius: 10px; color: #78350f;
}

.site-footer { border-top: 1px solid var(--border); background: var(--surface); }
.footer-inner { padding: 2rem 0; display: grid; gap: 0.5rem; text-align: center; }
.footer-inner a { color: var(--primary); font-weight: 600; }
.muted { color: var(--muted); margin: 0; }

@media (min-width: 768px) {
  .hero-inner { padding: 4.5rem 0; }
  .section { padding: 4rem 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}