:root {
  --bg: #eef2f7;
  --bg-grad-1: #e7edf5;
  --bg-grad-2: #dfe7f1;
  --card: #ffffff;
  --ink: #1c2733;
  --muted: #64748b;
  --line: #e2e8f0;
  --brand: #1e5fbf;
  --brand-ink: #ffffff;
  --danger: #c0392b;
  --ok-bg: #e6f6ec; --ok-ink: #1a7f45; --ok-line: #b7e2c6;
  --err-bg: #fdeceb; --err-ink: #b3271a; --err-line: #f5c6c2;
  --shadow: 0 10px 30px rgba(20,40,80,.10), 0 2px 6px rgba(20,40,80,.06);
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e141b; --bg-grad-1:#101821; --bg-grad-2:#0b1119;
    --card:#161f2b; --ink:#e7edf5; --muted:#93a2b5; --line:#26303d;
    --brand:#4a90e2; --brand-ink:#0b1119;
    --ok-bg:#12271b; --ok-ink:#6ee7a0; --ok-line:#1f4632;
    --err-bg:#2a1412; --err-ink:#ff9d94; --err-line:#5a2723;
    --shadow: 0 12px 34px rgba(0,0,0,.45);
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: radial-gradient(1200px 600px at 50% -10%, var(--bg-grad-1), var(--bg)) fixed;
  display: flex; flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* header */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 24px; max-width: 920px; width: 100%; margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 9px; text-decoration: none; color: var(--ink); }
.brand-mark { font-size: 22px; }
.brand-name { font-size: 20px; letter-spacing: -.2px; }
.brand-name strong { color: var(--brand); }
.nav { display: flex; align-items: center; gap: 18px; font-size: 14px; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover { color: var(--ink); }
.nav .who { color: var(--muted); font-weight: 600; }

/* layout */
.wrap { flex: 1; width: 100%; max-width: 560px; margin: 0 auto; padding: 24px 20px 48px; }
.foot { text-align: center; color: var(--muted); font-size: 12.5px; padding: 22px; }

/* card */
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 30px; margin-bottom: 22px;
}
.card-narrow { max-width: 400px; margin-left: auto; margin-right: auto; }
.center { text-align: center; }
.card-title { margin: 0 0 6px; font-size: 22px; letter-spacing: -.3px; }
.card-sub { margin: 0 0 22px; color: var(--muted); font-size: 14.5px; line-height: 1.5; }

/* forms */
label { display: block; font-size: 13px; font-weight: 600; margin: 14px 0 6px; color: var(--ink); }
label.check { font-weight: 500; display: flex; align-items: center; gap: 8px; }
input[type=text], input[type=password] {
  width: 100%; padding: 11px 13px; font-size: 15px;
  border: 1px solid var(--line); border-radius: 9px; background: var(--bg);
  color: var(--ink); transition: border-color .15s, box-shadow .15s;
}
input[type=text]:focus, input[type=password]:focus {
  outline: none; border-color: var(--brand);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 22%, transparent);
}

.btn {
  display: inline-block; width: 100%; margin-top: 22px; padding: 12px 16px;
  font-size: 15px; font-weight: 600; border: 0; border-radius: 9px;
  cursor: pointer; transition: transform .05s, filter .15s, background .15s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--brand); color: var(--brand-ink); }
.btn-primary:hover { filter: brightness(1.06); }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { width: auto; margin: 0; padding: 7px 12px; font-size: 13px; }

/* dropzone */
.dropzone {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 6px; text-align: center; padding: 34px 20px; cursor: pointer;
  border: 2px dashed var(--line); border-radius: 12px; background: var(--bg);
  transition: border-color .15s, background .15s;
}
.dropzone:hover, .dropzone.drag { border-color: var(--brand); background: color-mix(in srgb, var(--brand) 7%, var(--bg)); }
.dz-icon { font-size: 30px; }
.dz-text { font-size: 15px; font-weight: 600; word-break: break-all; }
.dz-hint { font-size: 12.5px; color: var(--muted); }
.dropzone input[type=file] { display: none; }
.uploading { margin-top: 18px; text-align: center; color: var(--muted); font-size: 14px; }

/* flashes */
.flashes { margin-bottom: 18px; display: grid; gap: 10px; }
.flash { padding: 12px 14px; border-radius: 9px; font-size: 14px; border: 1px solid transparent; }
.flash-success { background: var(--ok-bg); color: var(--ok-ink); border-color: var(--ok-line); }
.flash-error { background: var(--err-bg); color: var(--err-ink); border-color: var(--err-line); }
.flash-message { background: var(--bg); color: var(--muted); border-color: var(--line); }

/* users table */
table.users { width: 100%; border-collapse: collapse; font-size: 14.5px; }
table.users th { text-align: left; font-size: 12px; text-transform: uppercase;
  letter-spacing: .04em; color: var(--muted); padding: 0 10px 10px; }
table.users td { padding: 11px 10px; border-top: 1px solid var(--line); vertical-align: middle; }
table.users td.right, td.right { text-align: right; }
.muted { color: var(--muted); }
.badge { background: color-mix(in srgb, var(--brand) 15%, transparent);
  color: var(--brand); font-size: 12px; font-weight: 700; padding: 2px 8px; border-radius: 20px; }
.field-err { color: var(--err-ink); font-size: 12.5px; margin-top: 5px; }