/* s2u.space — portada pública + panel interno (/s4u, /m4u). Identidad tomada de smart-2u.one:
   petróleo profundo, turquesa y ámbar como acento único. */
:root {
  --bg: #071c1c;
  --bg-2: #0a2a2a;
  --surface: rgba(13, 64, 64, 0.38);
  --surface-solid: #0d3434;
  --line: rgba(29, 217, 199, 0.18);
  --text: #e8f4f2;
  --muted: #9fbcb8;
  --accent: #1dd9c7;
  --accent-ink: #042523;
  --accent-2: #f5a623;
  --ok: #3ddc84;
  --err: #ff7b72;
  --radius: 14px;
  --font: Inter, "Segoe UI", system-ui, -apple-system, sans-serif;
}
* { box-sizing: border-box; }
html { color-scheme: dark; }
body {
  margin: 0; min-height: 100vh; font-family: var(--font); color: var(--text); line-height: 1.55;
  background: radial-gradient(1200px 600px at 85% -10%, rgba(29, 217, 199, .16), transparent 60%),
              radial-gradient(900px 500px at -10% 30%, rgba(18, 146, 130, .18), transparent 60%),
              linear-gradient(180deg, var(--bg-2), var(--bg) 60%);
}
a { color: var(--accent); }
.wrap { width: min(1120px, 100%); margin: 0 auto; padding-inline: 20px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; background: var(--accent); color: var(--accent-ink); padding: 8px 12px; border-radius: 8px; z-index: 10; }

/* Barra superior */
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 20px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--text); }
.brand img { width: 40px; height: 40px; border-radius: 10px; }
.brand strong { display: block; font-size: 1.05rem; letter-spacing: .01em; }
.brand small { color: var(--muted); font-size: .78rem; }
.access-link { color: var(--muted); text-decoration: none; font-size: .85rem; border: 1px solid var(--line);
  padding: 6px 14px; border-radius: 999px; transition: color .15s, border-color .15s; }
.access-link:hover, .access-link:focus-visible { color: var(--text); border-color: var(--accent); }

/* Botones */
.btn { display: inline-flex; align-items: center; gap: 8px; font: inherit; font-weight: 600; text-decoration: none; cursor: pointer;
  border-radius: 999px; padding: 12px 22px; border: 1px solid transparent; transition: transform .15s, background .15s; }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: #4fe6d8; transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--accent); }
.btn-small { padding: 7px 14px; font-size: .82rem; }
.btn:focus-visible, .access-link:focus-visible, .tile:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 3px; }

/* Portada */
.hero { padding-block: clamp(48px, 9vw, 110px) 48px; max-width: 760px; }
.eyebrow { color: var(--accent); font-size: .8rem; letter-spacing: .14em; text-transform: uppercase; font-weight: 600; margin: 0 0 14px; }
.hero h1 { font-size: clamp(2.1rem, 5.4vw, 3.6rem); line-height: 1.08; margin: 0 0 18px; letter-spacing: -.02em; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p.lead { font-size: clamp(1.02rem, 1.8vw, 1.2rem); color: var(--muted); margin: 0 0 30px; max-width: 620px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; }
.pillars { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; padding-bottom: 56px; }
.pillar { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.pillar h2 { font-size: 1.02rem; margin: 0 0 6px; }
.pillar p { margin: 0; color: var(--muted); font-size: .92rem; }
.pillar .mark { display: inline-block; width: 28px; height: 3px; border-radius: 2px; background: var(--accent); margin-bottom: 14px; }
.pillar:nth-child(2) .mark { background: var(--accent-2); }
.band { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: rgba(4, 20, 20, .45); }
.band .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 18px; padding-block: 28px; }
.band p { margin: 0; color: var(--muted); max-width: 640px; }
.band strong { color: var(--text); }
.footer { color: var(--muted); font-size: .8rem; padding-block: 28px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; }

/* Login */
.login-shell { min-height: calc(100vh - 100px); display: grid; place-items: center; padding-block: 24px; }
.login-card { width: min(420px, 100%); background: var(--surface-solid); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.login-card h1 { font-size: 1.3rem; margin: 0 0 4px; }
.login-card p.sub { color: var(--muted); margin: 0 0 20px; font-size: .9rem; }
.field { display: block; margin-bottom: 14px; }
.field span { display: block; font-size: .8rem; color: var(--muted); margin-bottom: 6px; }
.field input { width: 100%; font: inherit; padding: 11px 12px; border-radius: 10px; border: 1px solid var(--line);
  background: rgba(0, 0, 0, .25); color: var(--text); }
.field input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.login-card .btn { width: 100%; justify-content: center; margin-top: 6px; }
.alert { border-radius: 10px; padding: 10px 12px; font-size: .88rem; margin-bottom: 16px; }
.alert-err { background: rgba(255, 123, 114, .12); border: 1px solid rgba(255, 123, 114, .5); }
.alert-ok { background: rgba(61, 220, 132, .12); border: 1px solid rgba(61, 220, 132, .5); }
.fine { color: var(--muted); font-size: .76rem; margin: 16px 0 0; }

/* Panel interno */
.inbar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; padding-block: 16px;
  border-bottom: 1px solid var(--line); }
.innav { display: flex; flex-wrap: wrap; gap: 6px; }
.innav a { color: var(--muted); text-decoration: none; padding: 7px 14px; border-radius: 999px; font-size: .88rem; }
.innav a[aria-current="page"] { background: var(--surface); color: var(--text); border: 1px solid var(--line); }
.whoami { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: .84rem; }
.whoami form { margin: 0; }
.page-head { padding-block: 28px 8px; }
.page-head h1 { margin: 0 0 6px; font-size: 1.6rem; }
.page-head p { margin: 0; color: var(--muted); }
.tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; padding-block: 18px 40px; }
.tile { display: flex; flex-direction: column; gap: 6px; text-decoration: none; color: var(--text); background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; transition: border-color .15s, transform .15s; }
.tile:hover { border-color: var(--accent); transform: translateY(-1px); }
.tile strong { font-size: 1rem; }
.tile small { color: var(--muted); }
.tile .host { color: var(--muted); font-size: .76rem; font-family: ui-monospace, Consolas, monospace; overflow-wrap: anywhere; }
.status { display: inline-flex; align-items: center; gap: 6px; font-size: .74rem; color: var(--muted); }
.status::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--muted); }
.status.up::before { background: var(--ok); }
.status.down::before { background: var(--err); }
.section-label { font-size: .78rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin: 22px 0 0; }
.note { color: var(--muted); font-size: .82rem; padding-bottom: 32px; }
@media (max-width: 560px) {
  .topbar { padding-block: 14px; }
  .brand small { display: none; }
  .whoami span { display: none; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }