/* index.css — Landing minimalista en escala de grises */
:root{
  --bg: #f4f4f5;
  --bg-contrast: #e6e7e9;
  --ink: #111113;
  --muted-ink: #3a3a3c;
  --line: #d5d6d8;

  --btn-bg: #fafafa;
  --btn-bg-hover: #f0f0f0;
  --btn-ink: #171717;
  --btn-border: #cfcfd2;

  --radius: 10px;
  --shadow: 0 1px 0 rgba(0,0,0,.05), 0 8px 20px rgba(0,0,0,.06);
}

/* Modo oscuro automático */
@media (prefers-color-scheme: dark){
  :root{
    --bg: #111113;
    --bg-contrast: #161618;
    --ink: #f5f5f7;
    --muted-ink: #c9c9cc;
    --line: #2a2a2e;

    --btn-bg: #1a1a1c;
    --btn-bg-hover: #202023;
    --btn-ink: #f5f5f7;
    --btn-border: #2e2e33;
  }
}

* { box-sizing: border-box; }
html, body {
  height: 100%;
}
body{
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 800px at 100% -100%, var(--bg-contrast), transparent 60%),
    radial-gradient(800px 600px at -20% 120%, var(--bg-contrast), transparent 60%),
    linear-gradient(180deg, var(--bg), var(--bg));
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Layout */
.wrap{
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header{
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--bg-contrast), var(--bg) 60%);
}

.brand{
  margin: 32px 0 6px;
  font-size: clamp(32px, 6vw, 56px);
  letter-spacing: .5px;
  font-weight: 800;
}

.tagline{
  margin: 0 0 20px;
  color: var(--muted-ink);
  font-size: 15px;
}

.site-main{
  display: grid;
  place-items: center;
  padding: 32px 0 48px;
  min-height: calc(100vh - 210px);
}

.links{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  width: 100%;
  margin-top: 12px;
}

/* Botones tipo "enlace", sobrios */
.btn{
  display: inline-block;
  text-align: center;
  text-decoration: none;
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  color: var(--btn-ink);
  padding: 12px 16px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform .04s ease-in-out, background .15s ease, border-color .2s ease;
}
.btn:hover{
  background: var(--btn-bg-hover);
  transform: translateY(-1px);
}
.btn:active{
  transform: translateY(0);
}
.btn:focus{
  outline: 2px dashed var(--muted-ink);
  outline-offset: 2px;
}

/* Footer sobrio */
.site-footer{
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, var(--bg), var(--bg-contrast));
  color: var(--muted-ink);
  font-size: 13px;
  padding: 18px 0 28px;
  text-align: center;
}

/* Utilidades opcionales */
.visually-hidden{
  position: absolute !important;
  height: 1px; width: 1px;
  overflow: hidden; clip: rect(1px,1px,1px,1px);
  white-space: nowrap; border: 0; padding: 0; margin: -1px;
}