:root {
  --bg: #0f172a; --panel: #1e293b; --border: #334155;
  --text: #e2e8f0; --muted: #94a3b8; --primary: #3b82f6; --primary-h: #2563eb;
  --ok: #4ade80; --err: #f87171;
}
* { box-sizing: border-box; }
body {
  margin: 0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.6;
}
.topnav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 1.5rem; border-bottom: 1px solid var(--border); background: var(--panel);
}
.brand { font-weight: 700; color: var(--text); text-decoration: none; font-size: 1.1rem; }
.topnav nav { display: flex; gap: 1rem; align-items: center; }
.topnav a { color: var(--muted); text-decoration: none; font-size: .95rem; }
.topnav a:hover { color: var(--text); }
.topnav .lang { font-style: italic; }
.container { max-width: 760px; margin: 0 auto; padding: 2rem 1.5rem; }
.hero { text-align: center; padding: 3rem 0; }
.hero h1 { font-size: 2.4rem; margin: 0 0 .5rem; color: #60a5fa; }
.hero p { color: var(--muted); font-size: 1.15rem; margin-bottom: 2rem; }
.btn {
  display: inline-block; background: var(--primary); color: #fff;
  padding: .6rem 1.2rem; border-radius: .5rem; text-decoration: none;
  border: 0; cursor: pointer; font-size: 1rem;
}
.btn:hover { background: var(--primary-h); }
.btn-lg { padding: .8rem 2rem; font-size: 1.1rem; }
.btn-muted { color: var(--muted) !important; }
.auth { background: var(--panel); border: 1px solid var(--border); border-radius: 1rem; padding: 2rem; max-width: 480px; margin: 1rem auto; }
.auth h2 { margin-top: 0; }
.auth label { display: block; margin-bottom: 1rem; font-size: .9rem; color: var(--muted); }
.auth input, .auth select {
  display: block; width: 100%; padding: .65rem; margin-top: .3rem;
  background: var(--bg); border: 1px solid var(--border); border-radius: .4rem;
  color: var(--text); font-size: 1rem;
}
.errors { background: rgba(248,113,113,.1); border: 1px solid var(--err); border-radius: .5rem; padding: .8rem 1rem .8rem 2rem; color: var(--err); margin-bottom: 1rem; }
.flash { background: rgba(74,222,128,.1); border: 1px solid var(--ok); border-radius: .5rem; padding: .8rem 1rem; color: var(--ok); margin-bottom: 1rem; }
.alt { text-align: center; color: var(--muted); margin-top: 1.2rem; }
.alt a { color: #60a5fa; }
.dash h2 { color: #60a5fa; }
.welcome { font-size: 1.3rem; }
.muted { color: var(--muted); }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 1rem; padding: 1.5rem; margin-top: 1.5rem; }
.foot { text-align: center; color: var(--muted); font-size: .85rem; padding: 2rem; border-top: 1px solid var(--border); margin-top: 3rem; }