:root{
  --bg: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --card: #f8fafc;
  --accent: #2563eb;
  --radius: 12px;
  --shadow: 0 6px 18px rgba(2,6,23,0.08);
}
@media (prefers-color-scheme: dark){
  :root{
    --bg: #0b1220;
    --text: #e6eef8;
    --muted: #94a3b8;
    --card: #071025;
    --accent: #60a5fa;
    --shadow: 0 6px 30px rgba(2,6,23,0.6);
  }
}
[data-theme='dark']{
  --bg: #0b1220; --text:#0f172a; --muted:#64748b;  --cardborder:1px solid #5d90cf; --accent:#2563eb; --shadow:0 6px 30px rgba(2,6,23,0.6); --border: rgba(255,255,255,0.1);
  --bgimg: url("/assets/images/bg_login_dark.jpg");
  --bgcolor: rgba(255,255,255,0.9);
}
[data-theme='light']{
  --bg: #ffffff; --text:#0f172a; --muted:#64748b;  --cardborder:1px solid #5d90cf; --accent:#2563eb; --shadow:0 6px 18px rgba(2,6,23,0.08); --border: rgba(15,23,42,0.06);
  --bgimg: url("/assets/images/bg_login_light.jpg");
  --bgcolor: rgba(255,255,255,0.9);
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);background-image:var(--bgimg);background-position:center;background-size:cover;color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial;min-height:100vh;display:flex;align-items:center;justify-content:center;padding:2rem;transition:background-color .2s,color .2s}
.shell{width:100%;max-width:420px}
.card{border-radius:var(--radius);border:var(--cardborder);box-shadow:var(--shadow);padding:2rem;border:1px solid var(--border);background-color: var(--bgcolor)}
h1{margin:0 0 1rem;font-size:1.25rem}
label{display:block;margin-bottom:.5rem;color:var(--muted)}
input[type="email"],input[type="password"],input[type="text"]{width:100%;padding:.75rem;border-radius:8px;border:1px solid rgba(15,23,42,0.06);background:transparent;color:var(--text);margin-bottom:1rem}
button{background:var(--accent);color:white;border:0;padding:.75rem 1rem;border-radius:10px;cursor:pointer}
.meta{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}
.theme-toggle{background:transparent;border:1px solid rgba(15,23,42,0.06);padding:.35rem .6rem;border-radius:8px;color:var(--muted);cursor:pointer}
.muted{color:var(--muted);font-size:.95rem}
footer{margin-top:.75rem;text-align:center;color:var(--muted);font-size:.85rem}
@media (max-width:480px){.shell{padding:0 1rem}}