/* HTML hub (standalone) — shared design system.
   Black/white/Inter aesthetic carried over from the Streamlit hub. */

:root {
  --bg: #ffffff;
  --fg: #0a0a0a;
  --line: rgba(10, 10, 10, 0.18);
  --paper: #fffdf7;
  --tab: #fde68a;
  --accent: #b45309;
  --muted: #6b7280;
  --ok: #16a34a;
  --danger: #dc2626;
  --maxw: 1100px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a { color: inherit; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 18px 64px; }

/* --- Top navigation -------------------------------------------------------- */
.nav {
  position: sticky; top: 0; z-index: 40;
  background: var(--bg); border-bottom: 2px solid var(--fg);
  display: flex; align-items: center; gap: 18px;
  padding: 12px 18px; margin-bottom: 22px;
}
.nav .brand { font-weight: 900; font-size: 1.05rem; letter-spacing: .02em; }
.nav .links { display: flex; gap: 6px; flex: 1; flex-wrap: wrap; }
.nav .links a {
  text-decoration: none; font-weight: 800; font-size: .82rem;
  text-transform: uppercase; letter-spacing: .06em;
  padding: 7px 12px; border: 2px solid transparent; border-radius: 8px;
}
.nav .links a:hover { border-color: var(--line); }
.nav .links a.active { border-color: var(--fg); }
.nav .who { font-size: .8rem; color: var(--muted); }

/* --- Buttons --------------------------------------------------------------- */
.btn {
  border: 2px solid var(--fg); background: #fff; color: var(--fg);
  font-weight: 800; text-transform: uppercase; letter-spacing: .06em;
  border-radius: 8px; padding: 8px 14px; cursor: pointer; font-size: .82rem;
  transition: transform .14s ease, background .14s ease, color .14s ease;
}
.btn:hover { background: var(--fg); color: #fff; transform: translateY(-1px); }
.btn.solid { background: var(--fg); color: #fff; }
.btn.solid:hover { background: #fff; color: var(--fg); }
.btn.danger:hover { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn:disabled { opacity: .5; cursor: default; transform: none; }

/* --- Headings -------------------------------------------------------------- */
.h1 { font-weight: 900; font-size: 2rem; margin: 6px 0 2px; }
.rule { height: 4px; width: 140px; background: var(--fg); border-radius: 2px; margin: 6px 0 22px; }
.center { text-align: center; }
.center .rule { margin-left: auto; margin-right: auto; }
.muted { color: var(--muted); }

/* --- Login overlay --------------------------------------------------------- */
.login-overlay {
  position: fixed; inset: 0; z-index: 100;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg);
}
.login-card {
  width: 360px; max-width: calc(100vw - 32px);
  border: 2px solid var(--fg); border-radius: 12px; background: var(--paper);
  padding: 22px; box-shadow: 0 10px 24px rgba(10,10,10,.12);
}
.login-card h2 { margin: 0 0 14px; font-weight: 900; }
.login-card input {
  width: 100%; padding: 10px; margin-bottom: 10px;
  border: 2px solid var(--line); border-radius: 8px; font-size: .95rem; outline: none;
}
.login-card input:focus { border-color: var(--fg); }
.login-card .msg { min-height: 1.2em; margin-top: 8px; font-size: .85rem; }
.login-card .msg.err { color: var(--danger); font-weight: 700; }

/* --- Cards grid (landing) -------------------------------------------------- */
.tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; }
.tile {
  display: block; text-decoration: none; border: 2px solid var(--fg); border-radius: 12px;
  background: var(--paper); padding: 20px; min-height: 120px;
  box-shadow: 0 6px 14px rgba(10,10,10,.08); transition: transform .16s ease, box-shadow .16s ease;
}
.tile:hover { transform: translateY(-3px); box-shadow: 0 14px 28px rgba(10,10,10,.18); }
.tile.soon { opacity: .55; pointer-events: none; }
.tile .ico { font-size: 1.6rem; }
.tile .t { font-weight: 900; font-size: 1.15rem; margin-top: 8px; }
.tile .d { color: var(--muted); font-size: .85rem; margin-top: 4px; }