/* ============================================================
   Claude 101 — Estilos compartidos
   Paleta, tipografía, layout, componentes base, accesibilidad.
   ============================================================ */

:root {
  --bg: #F4EFE3;
  --bg-2: #EFE9DA;
  --bg-3: #E8E1CC;
  --card: #FBF8F0;
  --ink: #1C1A16;
  --ink-2: #3A352D;
  --muted: #756B5B;
  --muted-2: #A39782;
  --line: #E1D8C2;
  --line-2: #CFC4AA;
  --accent: #C8542B;
  --accent-2: #8B3A1E;
  --accent-soft: rgba(200, 84, 43, 0.08);
  --olive: #4F5D38;
  --olive-soft: rgba(79, 93, 56, 0.08);
  --gold: #B08436;
  --gold-soft: rgba(176, 132, 54, 0.08);

  --display: 'Fraunces', Georgia, serif;
  --body: 'Geist', system-ui, -apple-system, sans-serif;
  --mono: 'Geist Mono', ui-monospace, SFMono-Regular, monospace;

  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 24px;
  --r-pill: 100px;

  --shadow-xs: 0 1px 2px rgba(28,26,22,.04);
  --shadow-sm: 0 1px 2px rgba(28,26,22,.04), 0 2px 8px rgba(28,26,22,.04);
  --shadow-md: 0 4px 12px rgba(28,26,22,.06), 0 8px 24px rgba(28,26,22,.06);
  --shadow-lg: 0 12px 32px rgba(28,26,22,.10), 0 24px 60px rgba(28,26,22,.08);

  --ease: cubic-bezier(.2,.8,.2,1);
  --pad-x: clamp(20px, 4vw, 40px);
  --container: 1200px;
  --container-sm: 720px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

html, body {
  min-height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01", "kern";
}

body {
  background-image:
    radial-gradient(900px circle at 15% 5%, rgba(200, 84, 43, 0.06), transparent 50%),
    radial-gradient(700px circle at 85% 95%, rgba(79, 93, 56, 0.05), transparent 50%);
  overflow-x: hidden;
}

/* Selección consistente */
::selection { background: var(--accent); color: var(--bg); }
::-moz-selection { background: var(--accent); color: var(--bg); }

/* Scrollbar discreto */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--line-2); border-radius: 100px; border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: var(--muted-2); }

/* Focus accesible — siempre visible */
*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

/* Skip link para teclado */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--ink);
  color: var(--bg);
  padding: 8px 14px;
  text-decoration: none;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  text-transform: uppercase;
  z-index: 1000;
  border-radius: 0 0 var(--r-sm) 0;
}
.skip-link:focus { top: 0; }

a { color: var(--accent); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--accent-2); }
a:focus-visible { outline-offset: 4px; }

img, svg { max-width: 100%; height: auto; vertical-align: middle; }

/* ============================================================
   Tipografía
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--display);
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1.15;
}
.h-display { font-style: italic; }
.h-display em { font-style: normal; color: var(--accent); }
.text-muted { color: var(--muted); }
.mono {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ============================================================
   Layout — container con padding lateral correcto
   ============================================================ */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
  width: 100%;
}
.container-sm {
  max-width: var(--container-sm);
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
  width: 100%;
}

/* ============================================================
   Navbar
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(244, 239, 227, 0.85);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px var(--pad-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  font-family: var(--display);
  font-style: italic;
  font-size: 22px;
  letter-spacing: -0.02em;
  color: var(--ink);
  flex-shrink: 0;
}
.brand em { font-style: normal; color: var(--accent); }
.nav-links { display: flex; gap: 24px; align-items: center; }
.nav-links a {
  color: var(--ink-2);
  font-size: 14px;
  transition: color .15s ease;
}
.nav-links a:hover { color: var(--accent); }

/* Menú móvil */
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--line-2);
  width: 40px;
  height: 40px;
  border-radius: var(--r-pill);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav-toggle span {
  width: 18px;
  height: 2px;
  background: var(--ink);
  position: relative;
}
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--ink);
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }

@media (max-width: 760px) {
  .nav-toggle { display: flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(244, 239, 227, 0.98);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    padding: 16px var(--pad-x);
    gap: 14px;
    align-items: stretch;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 6px 0; font-size: 16px; }
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--body);
  font-size: 14px;
  font-weight: 500;
  padding: 12px 22px;
  border-radius: var(--r-pill);
  cursor: pointer;
  transition: all .2s var(--ease);
  border: 1px solid transparent;
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .55; cursor: not-allowed; }

.btn-primary {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
.btn-primary:hover { background: var(--accent); border-color: var(--accent); color: var(--bg); text-decoration: none; }
.btn-ghost {
  background: transparent;
  color: var(--ink-2);
  border-color: var(--line-2);
}
.btn-ghost:hover { border-color: var(--ink-2); color: var(--ink); text-decoration: none; background: var(--card); }
.btn-accent {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}
.btn-accent:hover { background: var(--accent-2); border-color: var(--accent-2); color: var(--bg); text-decoration: none; }

.btn-lg { font-size: 15px; padding: 16px 28px; }
.btn-sm { font-size: 12px; padding: 8px 16px; }
.btn-block { display: flex; width: 100%; }

/* Spinner para botones en loading */
.btn .spin {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
   Forms
   ============================================================ */
.input, .textarea, .select {
  width: 100%;
  font-family: var(--body);
  font-size: 15px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--bg);
  color: var(--ink);
  transition: all .15s ease;
  -webkit-appearance: none;
  appearance: none;
}
.input:focus, .textarea:focus, .select:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--card);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.input::placeholder { color: var(--muted-2); }
.label { display: block; margin-bottom: 6px; font-size: 13px; color: var(--ink-2); font-weight: 500; }

/* ============================================================
   Cards
   ============================================================ */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}
.card-hover {
  transition: all .25s var(--ease);
}
.card-hover:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--line-2);
}

/* ============================================================
   Alerts
   ============================================================ */
.alert {
  padding: 14px 16px;
  border-radius: var(--r-md);
  margin: 12px 0;
  font-size: 13px;
  line-height: 1.55;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.alert::before { content: ""; width: 4px; align-self: stretch; border-radius: 100px; flex-shrink: 0; }
.alert-info { background: var(--bg-2); color: var(--ink-2); }
.alert-info::before { background: var(--muted-2); }
.alert-success { background: var(--olive-soft); color: var(--olive); }
.alert-success::before { background: var(--olive); }
.alert-error { background: var(--accent-soft); color: var(--accent-2); }
.alert-error::before { background: var(--accent); }

/* ============================================================
   Badges
   ============================================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: var(--r-pill);
  background: var(--bg-2);
  color: var(--ink-2);
}
.badge-accent { background: var(--accent-soft); color: var(--accent); }
.badge-olive { background: var(--olive-soft); color: var(--olive); }
.badge-gold { background: var(--gold-soft); color: var(--gold); }

/* ============================================================
   Demo banner
   ============================================================ */
.demo-banner {
  background: linear-gradient(135deg, var(--gold), var(--accent));
  color: var(--bg);
  padding: 10px var(--pad-x);
  text-align: center;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.demo-banner a { color: var(--bg); text-decoration: underline; }

/* ============================================================
   Footer
   ============================================================ */
footer.foot {
  padding: 56px var(--pad-x) 36px;
  border-top: 1px solid var(--line);
  background: var(--bg-2);
  margin-top: 0;
}
.foot-inner {
  max-width: var(--container);
  margin: 0 auto;
}
.foot-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}
.foot-col h4 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: 14px;
}
.foot-col a {
  display: block;
  padding: 5px 0;
  font-size: 13px;
  color: var(--muted);
}
.foot-col a:hover { color: var(--accent); }
.foot-brand {
  font-family: var(--display);
  font-style: italic;
  font-size: 22px;
  margin-bottom: 8px;
}
.foot-brand em { font-style: normal; color: var(--accent); }
.foot-tag {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
  max-width: 36ch;
}
.foot-bottom {
  border-top: 1px solid var(--line);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--muted);
  flex-wrap: wrap;
  gap: 12px;
}

@media (max-width: 760px) {
  .foot-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
}
@media (max-width: 440px) {
  .foot-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   Animations
   ============================================================ */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-up {
  opacity: 0;
  animation: fade-up .8s var(--ease) forwards;
}
.fade-up-1 { animation-delay: .05s; }
.fade-up-2 { animation-delay: .12s; }
.fade-up-3 { animation-delay: .20s; }
.fade-up-4 { animation-delay: .28s; }
.fade-up-5 { animation-delay: .36s; }

@keyframes pulse-dot {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 var(--olive); }
  50% { opacity: .65; box-shadow: 0 0 0 8px transparent; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
  html { scroll-behavior: auto; }
}