:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --warn: #d97706;
  --ok: #059669;
  --shadow: 0 1px 2px rgba(0,0,0,0.04), 0 4px 16px rgba(0,0,0,0.04);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.brand { font-weight: 700; text-decoration: none; color: var(--text); letter-spacing: 0.2px; }
.container { max-width: 1100px; margin: 24px auto; padding: 0 16px; }
.footer { text-align: center; color: var(--muted); padding: 32px 0; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 22px;
  margin-bottom: 18px;
  box-shadow: var(--shadow);
}
.card.narrow { max-width: 420px; margin-left: auto; margin-right: auto; margin-top: 64px; }
h1 { font-size: 22px; margin: 0 0 8px; }
h2 { font-size: 16px; margin: 18px 0 10px; }

label { display: block; margin: 10px 0; }
label > span { display: block; font-weight: 600; margin-bottom: 4px; }
input[type="text"], input[type="password"], input[type="file"] {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  font-size: 14px;
}
input[type="text"]:focus, input[type="password"]:focus {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
  border-color: transparent;
}

.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-top: 8px; }
.stack > * + * { margin-top: 8px; }
.inline { display: inline; }
.inline-form { display: inline-flex; gap: 4px; align-items: center; margin-right: 4px; }
.inline-form input[type="text"] { width: auto; min-width: 140px; }

.btn {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  border-radius: 6px;
  cursor: pointer;
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
}
.btn:hover { background: #f3f4f6; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn.danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn.danger:hover { background: var(--danger-hover); border-color: var(--danger-hover); }
.btn.small { padding: 4px 8px; font-size: 12px; }
.btn.link { background: transparent; border: none; color: var(--primary); padding: 0; }

.muted { color: var(--muted); }
.alert {
  padding: 10px 12px;
  border-radius: 6px;
  margin: 10px 0;
  border: 1px solid var(--border);
  background: #f9fafb;
}
.alert.error { background: #fef2f2; border-color: #fecaca; color: #991b1b; }
.alert.info  { background: #eff6ff; border-color: #bfdbfe; color: #1e3a8a; }

.pill {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  background: #f3f4f6;
  color: var(--muted);
  font-size: 12px;
}
.pill.ok { background: #ecfdf5; color: var(--ok); }
.pill.warn { background: #fffbeb; color: var(--warn); }

.checkbox { display: flex; align-items: center; gap: 8px; }
.checkbox input { margin: 0; }
.checkbox > span { font-weight: 500; margin: 0; }

.grid {
  width: 100%;
  border-collapse: collapse;
  margin-top: 8px;
}
.grid th, .grid td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.grid th { background: #f9fafb; font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; color: var(--muted); }

code, .link {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 12.5px;
  background: #f3f4f6;
  padding: 2px 6px;
  border-radius: 4px;
}

.deck-list { list-style: none; padding: 0; margin: 12px 0 0; }
.deck-list li { padding: 10px 0; border-bottom: 1px solid var(--border); }
.deck-list a { font-weight: 600; text-decoration: none; color: var(--primary); }
.deck-list a:hover { text-decoration: underline; }