:root {
  --bg: #f4f4f5;
  --surface: #ffffff;
  --ink: #18181b;
  --ink-soft: #52525b;
  --muted: #a1a1aa;
  --line: #e4e4e7;
  --accent: #18181b;
  --accent-ink: #ffffff;
  --success: #16a34a;
  --danger: #dc2626;
  --info: #2563eb;
  --warning: #d97706;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 8px 24px rgba(0,0,0,.06);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--ink); }

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header .bar {
  max-width: 1040px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.site-header img { height: 40px; display: block; }
.site-header nav { display: flex; gap: 8px; align-items: center; }

main {
  max-width: 1040px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}

.auth-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.auth-shell .card { width: 100%; max-width: 400px; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
}
.card + .card { margin-top: 24px; }

h1 { font-size: 1.6rem; font-weight: 650; margin: 0 0 4px; letter-spacing: -.01em; }
h2 { font-size: 1.2rem; font-weight: 600; margin: 0 0 16px; letter-spacing: -.01em; }
h3 { font-size: .8rem; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 24px 0 12px; }
.subtitle { color: var(--ink-soft); margin: 0 0 24px; }

.field { margin-bottom: 16px; }
.field label { display: block; font-size: .85rem; font-weight: 550; margin-bottom: 6px; color: var(--ink-soft); }
.input {
  width: 100%;
  padding: 10px 12px;
  font: inherit;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  transition: border-color .15s, box-shadow .15s;
}
.input:focus {
  outline: none;
  border-color: var(--ink);
  box-shadow: 0 0 0 3px rgba(24,24,27,.08);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  font: inherit;
  font-weight: 550;
  line-height: 1;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  transition: opacity .15s, background .15s, border-color .15s;
}
.btn:hover { opacity: .88; }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { background: var(--bg); opacity: 1; }
.btn-sm { padding: 6px 12px; font-size: .85rem; }
.btn-link { background: none; border: none; color: var(--ink-soft); padding: 8px 0; text-decoration: underline; cursor: pointer; }
.btn-full { width: 100%; justify-content: center; }
.btn-danger { color: var(--danger); }

.flash { border-radius: var(--radius-sm); padding: 12px 16px; margin-bottom: 16px; font-size: .9rem; border: 1px solid; }
.flash-success { background: #f0fdf4; border-color: #bbf7d0; color: #15803d; }
.flash-danger  { background: #fef2f2; border-color: #fecaca; color: #b91c1c; }
.flash-info    { background: #eff6ff; border-color: #bfdbfe; color: #1d4ed8; }
.flash-warning { background: #fffbeb; border-color: #fde68a; color: #b45309; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: start; }
@media (max-width: 820px) { .grid-2 { grid-template-columns: 1fr; } }

table { width: 100%; border-collapse: collapse; font-size: .92rem; }
thead th {
  text-align: left;
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  font-weight: 600;
  padding: 8px 12px;
  border-bottom: 1px solid var(--line);
}
tbody td { padding: 12px; border-bottom: 1px solid var(--line); vertical-align: middle; }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--bg); }
.row-actions { display: flex; gap: 6px; justify-content: flex-end; }
.row-actions form { display: inline; margin: 0; }

.preview-wrap {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 20px;
  overflow-x: auto;
}
.preview-label { font-size: .75rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin-bottom: 12px; }

.muted { color: var(--muted); font-size: .9rem; }
.stack > * + * { margin-top: 12px; }