:root {
  --bg: #f3f5f9;
  --surface: #ffffff;
  --surface-soft: #f8f9fc;
  --text: #1f2937;
  --muted: #6b7280;
  --line: #dbe1ea;
  --primary: #1d4ed8;
  --danger: #b00020;
  --success: #0f766e;
  --warn: #92400e;
  --radius: 12px;
  --shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
}

.page-shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.5rem;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.brand-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo {
  width: 42px;
  height: 42px;
  object-fit: contain;
  border-radius: 8px;
}

.brand h1,
.brand h2,
.brand p {
  margin: 0;
}

.brand p {
  color: var(--muted);
  font-size: 0.9rem;
}

.layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 1rem;
  padding: 1rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.panel-header {
  padding: 1rem 1rem 0.5rem;
}

.panel-header h3,
.panel-header h4 {
  margin: 0;
}

.panel-header p {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.panel-body {
  padding: 0.75rem 1rem 1rem;
}

.stack {
  display: grid;
  gap: 1rem;
}

.grid-2 {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.btn {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.6rem 0.9rem;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}

.btn.primary {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.btn.ai-btn {
  background: #f3f0ff;
  border-color: #d6ccff;
  color: #4c1d95;
}

.btn.ai-btn:hover {
  background: #ede9fe;
}

.btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.btn-row {
  display: flex;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.meta-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border-radius: 999px;
  padding: 0.3rem 0.6rem;
  background: var(--surface-soft);
  border: 1px solid var(--line);
  font-size: 0.85rem;
  color: var(--muted);
}

.meta-pill.warn {
  color: var(--warn);
}

.meta-pill.success {
  color: var(--success);
}

.meta-pill.source-pill {
  border-style: solid;
  font-weight: 600;
}

.meta-pill.source-pill.dataset-generated {
  color: #1d4ed8;
  border-color: #bfdbfe;
  background: #eff6ff;
}

.meta-pill.source-pill.instructor-custom {
  color: #6d28d9;
  border-color: #ddd6fe;
  background: #f5f3ff;
}

.error {
  color: var(--danger);
  min-height: 1.4rem;
}

.hidden {
  display: none !important;
}

.auth-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.auth-card {
  width: 100%;
  max-width: 540px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

.auth-card h1,
.auth-card p {
  margin: 0 0 0.75rem;
}

.auth-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
}

.auth-brand .brand-logo {
  width: 52px;
  height: 52px;
}

.auth-card p {
  color: var(--muted);
}

label {
  display: block;
  margin: 0.9rem 0 0.35rem;
  font-size: 0.95rem;
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.6rem 0.75rem;
  font: inherit;
}

.skeleton {
  position: relative;
  border-radius: 8px;
  background: linear-gradient(
    90deg,
    #e8edf4 25%,
    #f4f7fb 45%,
    #e8edf4 65%
  );
  background-size: 220% 100%;
  animation: pulse 1.4s ease-in-out infinite;
}

.skeleton.h-12 { height: 12px; }
.skeleton.h-16 { height: 16px; }
.skeleton.h-22 { height: 22px; }
.skeleton.h-32 { height: 32px; }
.skeleton.h-40 { height: 40px; }
.skeleton.h-56 { height: 56px; }
.skeleton.h-90 { height: 90px; }
.skeleton.h-130 { height: 130px; }
.skeleton.w-30 { width: 30%; }
.skeleton.w-45 { width: 45%; }
.skeleton.w-60 { width: 60%; }
.skeleton.w-75 { width: 75%; }
.skeleton.w-90 { width: 90%; }

.skeleton-block {
  padding: 0.85rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-soft);
  display: grid;
  gap: 0.6rem;
}

.state-card {
  border: 1px dashed var(--line);
  border-radius: 10px;
  background: var(--surface-soft);
  padding: 0.85rem;
}

.state-card h4,
.state-card p {
  margin: 0;
}

.state-card p {
  margin-top: 0.4rem;
  color: var(--muted);
}

.state-card.error {
  border-color: #f3c0c8;
  background: #fff3f6;
  color: #8f1239;
}

.state-card.empty {
  border-style: dashed;
}

.workflow-card {
  border-style: solid;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.workflow-card.active {
  border-color: #fde68a;
  background: #fffbeb;
}

.workflow-card.done {
  border-color: #86efac;
  background: #f0fdf4;
}

.dataset-checklist {
  display: grid;
  gap: 0.35rem;
}

.dataset-checklist label {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.92rem;
}

.dataset-checklist input[type="checkbox"] {
  width: auto;
}

.state-actions {
  margin-top: 0.75rem;
  display: flex;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.toast-zone {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 20;
  display: grid;
  gap: 0.6rem;
}

.toast {
  min-width: 220px;
  max-width: 300px;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 10px;
  box-shadow: var(--shadow);
  padding: 0.6rem 0.75rem;
  color: var(--text);
}

.toast.success {
  border-color: #95d5cf;
  background: #effcf9;
}

.toast.error {
  border-color: #f3c0c8;
  background: #fff3f6;
}

.inline-note {
  color: var(--muted);
  font-size: 0.9rem;
}

.scenario-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-soft);
  padding: 0.8rem;
  display: grid;
  gap: 0.5rem;
}

.scenario-card.selected {
  border-color: #8ab4ff;
  background: #eef4ff;
  box-shadow: inset 0 0 0 1px #c8dbff;
}

.loaded-scenario {
  border-color: #bdd3ff;
  background: #eef4ff;
}

.scenario-card h4,
.scenario-card p {
  margin: 0;
}

.scenario-card p {
  color: var(--muted);
  font-size: 0.92rem;
}

.kv-list {
  display: grid;
  gap: 0.35rem;
}

.kv-row {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.3rem;
}

.kv-row:last-child {
  border-bottom: 0;
}

.score-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-weight: 600;
}

.score-chip.good {
  background: #e9fbf5;
  color: #0f766e;
}

.score-chip.warn {
  background: #fff6e8;
  color: #92400e;
}

.score-chip.risk {
  background: #fff0f2;
  color: #be123c;
}

.severity-pill {
  border-radius: 999px;
  padding: 0.1rem 0.45rem;
  font-size: 0.82rem;
  font-weight: 600;
}

.severity-pill.low {
  background: #eefcf4;
  color: #166534;
}

.severity-pill.medium {
  background: #fff7ed;
  color: #9a3412;
}

.severity-pill.high {
  background: #fff1f2;
  color: #be123c;
}

.grade-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
}

.grade-pill.trained {
  background: #e9fbf5;
  color: #0f766e;
}

.grade-pill.proficient {
  background: #eef4ff;
  color: #1d4ed8;
}

.grade-pill.untrained {
  background: #fff1f2;
  color: #be123c;
}

.grade-pill.pending {
  background: #f3f4f6;
  color: #4b5563;
}

.final-lock {
  border: 1px solid #bbf7d0;
  background: linear-gradient(180deg, #f0fdf4 0%, #ecfdf3 100%);
  border-radius: 10px;
  padding: 0.75rem;
}

.final-lock h4,
.final-lock p {
  margin: 0;
}

.final-lock p {
  margin-top: 0.35rem;
  color: #166534;
}

.mini-bar-row {
  display: grid;
  gap: 0.35rem;
}

.mini-bar-track {
  height: 10px;
  border-radius: 999px;
  background: #e5eaf2;
  overflow: hidden;
}

.mini-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #f59e0b, #ef4444);
}

@keyframes pulse {
  0% { background-position: 100% 0; }
  100% { background-position: -100% 0; }
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }
}