:root {
  --bg: #f4f6f4;
  --surface: #ffffff;
  --surface-2: #eef1f6;
  --border: #dde1e6;
  --text: #313131;
  --text-muted: #4b4f58;
  --accent: #41ab34;
  --accent-hover: #328428;
  --danger: #b3261e;
  --danger-bg: #fdecec;
  --ok: #1e7d3c;
  --shadow: 0 1px 2px rgba(0,0,0,.06), 0 1px 8px rgba(0,0,0,.04);
  --radius: 8px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14171c;
    --surface: #1c2027;
    --surface-2: #242933;
    --border: #333a45;
    --text: #e7e9ec;
    --text-muted: #99a1ac;
    --accent: #87d27d;
    --accent-hover: #a3dc9c;
    --danger: #ff6b64;
    --danger-bg: #3a1f1f;
    --ok: #4cd074;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 1px 10px rgba(0,0,0,.25);
  }
}

/* Manual override via the theme toggle button, wins regardless of OS preference */
:root[data-theme="dark"] {
  --bg: #14171c;
  --surface: #1c2027;
  --surface-2: #242933;
  --border: #333a45;
  --text: #e7e9ec;
  --text-muted: #99a1ac;
  --accent: #87d27d;
  --accent-hover: #a3dc9c;
  --danger: #ff6b64;
  --danger-bg: #3a1f1f;
  --ok: #4cd074;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 1px 10px rgba(0,0,0,.25);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
}

code {
  background: var(--surface-2);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: .9em;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 16px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.header-title h1 { margin: 0 0 4px; font-size: 1.3rem; }
.header-title p { margin: 0; color: var(--text-muted); font-size: .88rem; max-width: 640px; }
.header-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.mode-tabs {
  display: flex;
  gap: 8px;
  padding: 10px 24px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
}
.mode-tab-btn {
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-size: .88rem;
  font-weight: 600;
  cursor: pointer;
}
.mode-tab-btn:hover { color: var(--text); }
.mode-tab-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.app-mode { display: none; }
.app-mode.active { display: block; }

.tabs {
  display: flex;
  gap: 2px;
  padding: 0 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}
.tab-btn {
  padding: 12px 16px;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  color: var(--text-muted);
  font-size: .92rem;
  cursor: pointer;
  white-space: nowrap;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }

main { max-width: 980px; margin: 0 auto; padding: 24px; }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.panel-intro { margin-bottom: 18px; }
.panel-intro h2 { margin: 0 0 6px; }
.panel-intro p { margin: 0 0 12px; color: var(--text-muted); font-size: .92rem; max-width: 720px; }

.btn {
  padding: 8px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-size: .88rem;
  cursor: pointer;
}
.btn:hover { filter: brightness(1.05); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary { background: transparent; border: 1px dashed var(--border); color: var(--accent); }
.btn-ghost { background: transparent; }
.btn-danger-ghost { background: transparent; color: var(--danger); border-color: transparent; }
.btn-danger-ghost:hover { background: var(--danger-bg); }
.btn-large { padding: 12px 22px; font-size: 1rem; }
.btn-icon { padding: 4px 8px; font-size: .8rem; }

.card-list { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.card {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
  box-shadow: var(--shadow);
}
.card-body { flex: 1; min-width: 0; }
.card-title { font-weight: 600; }
.card-sub { color: var(--text-muted); font-size: .82rem; margin-top: 2px; }
.card-actions { display: flex; gap: 4px; flex-shrink: 0; }
.badge {
  display: inline-block;
  font-size: .72rem;
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--text-muted);
  border: 1px solid var(--border);
  margin-right: 4px;
}
.badge-required { color: var(--danger); border-color: var(--danger); }
.badge-cond { color: var(--accent); border-color: var(--accent); }

.inline-form { display: flex; gap: 8px; flex-wrap: wrap; }
.inline-form input[type=text], .inline-form input[type=number] {
  flex: 1;
  min-width: 180px;
  padding: 8px 10px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}
.inline-form-wrap { align-items: center; }
.checkbox-label { display: flex; align-items: center; gap: 6px; font-size: .85rem; white-space: nowrap; }

.category-group { margin-bottom: 22px; }
.category-group-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 8px;
  padding-bottom: 4px;
  border-bottom: 2px solid var(--border);
}
.category-group-header h3 { margin: 0; font-size: 1rem; }
.category-group-header span { color: var(--text-muted); font-size: .8rem; }

.question-card { cursor: default; }
.question-card .card-title { font-size: .95rem; }
.q-index { color: var(--text-muted); font-weight: 400; margin-right: 6px; }

.empty-hint {
  color: var(--text-muted);
  font-size: .88rem;
  padding: 18px;
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}

.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.45);
  overflow-y: auto;
  padding: 40px 16px;
  z-index: 50;
}
.modal-backdrop[hidden] { display: none; }
.modal-backdrop:not([hidden]) { display: flex; align-items: flex-start; justify-content: center; }
.modal-content {
  background: var(--surface);
  border-radius: 10px;
  padding: 22px;
  width: 100%;
  max-width: 640px;
  box-shadow: var(--shadow);
}
.modal-content h3 { margin-top: 0; }
.form-row { margin-bottom: 14px; }
.form-row label { display: block; font-size: .85rem; font-weight: 600; margin-bottom: 4px; }
.hint { font-weight: 400; color: var(--text-muted); font-size: .78rem; }
.form-row .hint { margin-top: 3px; }
.form-row input[type=text], .form-row input[type=number], .form-row select, .form-row textarea {
  width: 100%;
  padding: 8px 10px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-family: inherit;
  font-size: .92rem;
}
.form-row textarea { min-height: 70px; resize: vertical; }
.form-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 18px; }
.type-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px,1fr)); gap: 8px; }
.type-option {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 10px;
  cursor: pointer;
  font-size: .85rem;
}
.type-option.selected { border-color: var(--accent); background: var(--surface-2); color: var(--accent); font-weight: 600; }
.type-option small { display: block; color: var(--text-muted); font-weight: 400; margin-top: 2px; }

.tags-input { display: flex; flex-wrap: wrap; gap: 6px; padding: 8px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.tag { display: flex; align-items: center; gap: 4px; background: var(--surface-2); border-radius: 999px; padding: 3px 6px 3px 10px; font-size: .82rem; }
.tag button { border: none; background: none; color: var(--text-muted); cursor: pointer; font-size: .9rem; line-height: 1; padding: 2px; }
.tags-input input { border: none; outline: none; flex: 1; min-width: 100px; background: none; color: var(--text); font-size: .85rem; }

.summary-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px,1fr)); gap: 10px; margin-bottom: 18px; }
.summary-tile { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; text-align: center; }
.summary-tile .num { font-size: 1.6rem; font-weight: 700; }
.summary-tile .label { font-size: .78rem; color: var(--text-muted); }

.error-list { margin-bottom: 18px; }
.error-item {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid var(--danger);
  border-radius: var(--radius);
  padding: 8px 12px;
  margin-bottom: 6px;
  font-size: .88rem;
}
.ok-banner {
  background: rgba(30,125,60,.1);
  color: var(--ok);
  border: 1px solid var(--ok);
  border-radius: var(--radius);
  padding: 10px 14px;
  margin-bottom: 18px;
  font-size: .9rem;
}

.export-actions { display: flex; gap: 10px; align-items: center; }
.export-actions input[type=text] {
  flex: 1;
  max-width: 380px;
  padding: 10px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}

.users-table-scroll { overflow-x: auto; margin-bottom: 16px; }
.users-table { width: 100%; border-collapse: collapse; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.users-table th, .users-table td { padding: 9px 12px; border-bottom: 1px solid var(--border); text-align: left; font-size: .87rem; white-space: nowrap; }
.users-table th { color: var(--text-muted); font-size: .75rem; text-transform: uppercase; letter-spacing: .03em; background: var(--surface-2); }
.users-table tr:last-child td { border-bottom: none; }
.users-table td.actions-cell { display: flex; gap: 4px; }
.users-table td.wrap { white-space: normal; }

.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: .85rem;
  box-shadow: var(--shadow);
  z-index: 100;
}