:root {
  --bg: #ffffff;
  --surface: #fafafa;
  --surface2: #f4f4f4;
  --border: #e5e5e5;
  --border-focus: #111;
  --text: #111;
  --muted: #888;
  --accent: #111;
  --accent-dim: rgba(17,17,17,0.06);
  --green: #16a34a;
  --green-dim: rgba(22,163,74,0.08);
  --red: #dc2626;
  --red-dim: rgba(220,38,38,0.06);
  --radius: 4px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { height: 100%; }
body { font-family: 'Inter', system-ui, -apple-system, sans-serif; background: var(--bg); color: var(--text); min-height: 100%; font-size: 14px; }

.nav { height: 52px; border-bottom: 1px solid var(--border); display: flex; align-items: center; padding: 0 24px; justify-content: space-between; }
.nav-logo { font-family: 'Space Mono', monospace; font-size: 13px; font-weight: 700; letter-spacing: 0.06em; color: var(--text); text-decoration: none; }
.nav-logo span { color: var(--muted); }
.nav-right { display: flex; align-items: center; gap: 16px; }
.nav-link { font-size: 13px; color: var(--muted); text-decoration: none; }
.nav-link:hover { color: var(--text); }

.layout { display: flex; min-height: calc(100vh - 52px); }
.sidebar { width: 200px; border-right: 1px solid var(--border); padding: 20px 0; flex-shrink: 0; }
.sidebar-item { display: flex; align-items: center; gap: 8px; padding: 8px 20px; font-size: 13px; color: var(--muted); text-decoration: none; cursor: pointer; }
.sidebar-item:hover { color: var(--text); background: var(--surface2); }
.sidebar-item.active { color: var(--text); font-weight: 600; }
.main { flex: 1; padding: 32px; max-width: 900px; }

.page-title { font-size: 20px; font-weight: 600; margin-bottom: 4px; }
.page-sub { font-size: 13px; color: var(--muted); margin-bottom: 28px; }

.btn { display: inline-flex; align-items: center; gap: 6px; padding: 8px 14px; border-radius: var(--radius); font-size: 13px; font-weight: 500; cursor: pointer; border: 1px solid transparent; transition: all 0.1s; text-decoration: none; }
.btn-primary { background: var(--text); color: #fff; border-color: var(--text); }
.btn-primary:hover { background: #333; }
.btn-secondary { background: var(--bg); color: var(--text); border-color: var(--border); }
.btn-secondary:hover { background: var(--surface2); }
.btn-danger { background: var(--red-dim); color: var(--red); border-color: rgba(220,38,38,0.2); }
.btn-danger:hover { background: var(--red); color: #fff; }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-ghost { background: transparent; color: var(--muted); border-color: transparent; }
.btn-ghost:hover { color: var(--text); background: var(--surface2); }

.form-group { margin-bottom: 18px; }
.form-label { display: block; font-size: 12px; font-weight: 600; letter-spacing: 0.02em; margin-bottom: 6px; color: var(--text); }
.form-hint { font-size: 11px; color: var(--muted); margin-top: 4px; }
.form-input { width: 100%; border: 1px solid var(--border); border-radius: var(--radius); padding: 8px 11px; font-size: 13px; font-family: inherit; background: var(--bg); color: var(--text); outline: none; transition: border-color 0.1s; }
.form-input:focus { border-color: var(--border-focus); }
.form-input::placeholder { color: var(--muted); }
select.form-input { cursor: pointer; }
textarea.form-input { resize: vertical; min-height: 80px; }

.card { border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); }
.card-body { padding: 18px; }
.card-footer { padding: 12px 18px; border-top: 1px solid var(--border); display: flex; align-items: center; gap: 8px; }

.table { width: 100%; border-collapse: collapse; }
.table th { font-size: 11px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; color: var(--muted); padding: 8px 12px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
.table td { font-size: 13px; padding: 10px 12px; border-bottom: 1px solid var(--border); color: var(--text); }
.table tr:last-child td { border-bottom: none; }
.table tr:hover td { background: var(--surface2); }

.badge { display: inline-block; font-size: 11px; padding: 2px 7px; border-radius: 3px; font-weight: 500; }
.badge-green { background: var(--green-dim); color: var(--green); }
.badge-gray { background: var(--surface2); color: var(--muted); }
.badge-red { background: var(--red-dim); color: var(--red); }

.auth-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--surface); }
.auth-card { background: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 36px; width: 100%; max-width: 360px; }
.auth-logo { font-family: 'Space Mono', monospace; font-size: 16px; font-weight: 700; letter-spacing: 0.08em; margin-bottom: 4px; }
.auth-logo span { color: var(--muted); }
.auth-sub { font-size: 13px; color: var(--muted); margin-bottom: 28px; }
.auth-footer { text-align: center; margin-top: 18px; font-size: 12px; color: var(--muted); }
.auth-footer a { color: var(--text); }

/* Builder */
.builder-layout { display: flex; gap: 0; min-height: calc(100vh - 52px); }
.builder-fields { width: 280px; border-right: 1px solid var(--border); padding: 20px; overflow-y: auto; }
.builder-canvas { flex: 1; padding: 28px 32px; overflow-y: auto; background: var(--surface); }
.builder-preview { width: 320px; border-left: 1px solid var(--border); padding: 20px; overflow-y: auto; }
.field-type-btn { width: 100%; text-align: left; padding: 8px 10px; border: 1px solid var(--border); border-radius: var(--radius); font-size: 12px; cursor: pointer; background: var(--bg); margin-bottom: 6px; display: flex; align-items: center; gap: 8px; color: var(--text); }
.field-type-btn:hover { background: var(--surface2); border-color: var(--border-focus); }
.field-card { border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); margin-bottom: 10px; overflow: hidden; }
.field-card-header { padding: 10px 14px; display: flex; align-items: center; gap: 8px; cursor: pointer; }
.field-card-header:hover { background: var(--surface2); }
.field-card-drag { cursor: grab; color: var(--muted); font-size: 14px; }
.field-card-label { flex: 1; font-size: 13px; font-weight: 500; }
.field-card-type { font-size: 11px; color: var(--muted); font-family: 'Space Mono', monospace; }
.field-card-body { padding: 12px 14px; border-top: 1px solid var(--border); display: none; }
.field-card-body.open { display: block; }
.required-toggle { display: flex; align-items: center; gap: 6px; font-size: 12px; cursor: pointer; }

/* Public form */
.form-wrap { min-height: 100vh; background: var(--surface); display: flex; align-items: flex-start; justify-content: center; padding: 40px 20px; }
.form-card { background: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 36px; width: 100%; max-width: 560px; }
.form-title { font-size: 22px; font-weight: 600; margin-bottom: 4px; }
.form-desc { font-size: 13px; color: var(--muted); margin-bottom: 28px; line-height: 1.5; }
.form-field { margin-bottom: 20px; }
.form-field-label { display: block; font-size: 13px; font-weight: 500; margin-bottom: 6px; }
.form-field-label .req { color: var(--red); margin-left: 2px; }
.form-field-hint { font-size: 12px; color: var(--muted); margin-top: 4px; }
.form-submit { width: 100%; padding: 11px; background: var(--text); color: #fff; border: none; border-radius: var(--radius); font-size: 14px; font-weight: 600; cursor: pointer; transition: background 0.1s; }
.form-submit:hover { background: #333; }
.form-success { text-align: center; padding: 40px 20px; }
.form-success-icon { font-size: 36px; margin-bottom: 12px; }
.form-success-title { font-size: 20px; font-weight: 600; margin-bottom: 8px; }
.form-success-msg { font-size: 14px; color: var(--muted); }
.checkbox-group, .radio-group { display: flex; flex-direction: column; gap: 8px; }
.checkbox-item, .radio-item { display: flex; align-items: center; gap: 8px; font-size: 13px; cursor: pointer; }
input[type=checkbox], input[type=radio] { width: 15px; height: 15px; accent-color: var(--text); cursor: pointer; }

.empty-state { text-align: center; padding: 60px 20px; color: var(--muted); }
.empty-icon { font-size: 28px; margin-bottom: 10px; opacity: 0.4; }
.empty-text { font-size: 14px; margin-bottom: 16px; }

.share-box { display: flex; align-items: center; gap: 8px; background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius); padding: 8px 12px; }
.share-url { font-family: 'Space Mono', monospace; font-size: 11px; color: var(--text); flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.stat-row { display: flex; gap: 20px; margin-bottom: 24px; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 18px; min-width: 120px; }
.stat-label { font-size: 11px; color: var(--muted); margin-bottom: 4px; text-transform: uppercase; letter-spacing: 0.04em; }
.stat-val { font-size: 24px; font-weight: 600; }

.err-msg { font-size: 12px; color: var(--red); margin-top: 4px; }
.alert { padding: 10px 14px; border-radius: var(--radius); font-size: 13px; margin-bottom: 16px; }
.alert-err { background: var(--red-dim); color: var(--red); border: 1px solid rgba(220,38,38,0.2); }
.alert-ok { background: var(--green-dim); color: var(--green); border: 1px solid rgba(22,163,74,0.2); }

@media (max-width: 768px) {
  .sidebar { display: none; }
  .main { padding: 20px 16px; }
  .builder-preview { display: none; }
  .builder-fields { width: 200px; }
}