:root {
  --bg: #f8fafc;
  --bg-elev: #ffffff;
  --bg-tint: #f1f5f9;
  --border: #f1f5f9;
  --border-strong: #e2e8f0;
  --text: #0f172a;
  --text-muted: #64748b;
  --brand: #4CC9F0;
  --brand-hover: #38bdf8;
  --brand-soft: rgba(76, 201, 240, 0.10);
  --bad: #f43f5e;
  --bad-soft: #fff1f2;
  --radius: 14px;
  --shadow: 0 12px 24px -10px rgb(15 23 42 / 0.10);
  --font: 'DM Sans', system-ui, sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a.link {
  color: var(--brand-hover);
  text-decoration: none;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.2rem 1.6rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev);
}

.topbar-user {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0;
}

.user-badge {
  background: var(--brand-soft);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.9rem;
}

.page {
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.5rem 0 3rem;
  flex: 1;
}

.hero-title {
  margin: 0 0 0.35rem;
  font-size: 2rem;
}

.hero-subtitle {
  margin: 0;
  color: var(--text-muted);
  max-width: 60ch;
}

.model-stats {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.stat-chip {
  background: var(--bg-tint);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  font-size: 0.85rem;
}

.step-nav {
  display: flex;
  gap: 0.5rem;
  margin: 1.5rem 0;
}

.step-btn {
  border: 1px solid var(--border-strong);
  background: var(--bg-elev);
  border-radius: 999px;
  padding: 0.55rem 1rem;
  cursor: pointer;
  font: inherit;
}

.step-btn.active {
  background: var(--brand-soft);
  border-color: var(--brand);
}

.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem 1.5rem;
}

.card-title {
  margin: 0 0 0.75rem;
}

.card-subtitle {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.muted {
  color: var(--text-muted);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.field-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.field input {
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 0.65rem 0.75rem;
  font: inherit;
}

.field select {
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 0.65rem 0.75rem;
  font: inherit;
  background: #fff;
}

.form-section-title {
  margin: 1.25rem 0 0.75rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 600;
}

.feature-guide {
  margin: 1rem 0 1.25rem;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  background: var(--bg-tint);
}

.feature-guide summary {
  cursor: pointer;
  font-weight: 600;
}

.feature-guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 0.75rem;
}

.feature-list {
  margin: 0.35rem 0 0;
  padding-left: 1.2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.feature-list code {
  font-size: 0.82em;
}

.form-actions {
  margin-top: 1rem;
  display: flex;
  gap: 0.75rem;
}

.btn-primary, .btn-secondary {
  border: none;
  border-radius: 999px;
  padding: 0.65rem 1.2rem;
  font: inherit;
  cursor: pointer;
}

.btn-primary {
  background: var(--brand);
  color: #0f172a;
  font-weight: 600;
}

.btn-secondary {
  background: var(--bg-tint);
  border: 1px solid var(--border-strong);
}

.btn-primary:disabled, .btn-secondary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.link-button {
  border: none;
  background: none;
  color: var(--brand-hover);
  cursor: pointer;
  font: inherit;
}

.divider {
  border: none;
  border-top: 1px solid var(--border-strong);
  margin: 1.5rem 0;
}

.upload-zone {
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  color: var(--text-muted);
  cursor: pointer;
}

.upload-zone.dragover {
  border-color: var(--brand);
  background: var(--brand-soft);
}

.table-wrap {
  overflow: auto;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.data-table th, .data-table td {
  border-bottom: 1px solid var(--border-strong);
  padding: 0.55rem 0.65rem;
  text-align: left;
  white-space: nowrap;
}

.data-table th {
  background: var(--bg-tint);
}

.error-banner {
  background: var(--bad-soft);
  color: var(--bad);
  border: 1px solid #fecdd3;
  border-radius: 8px;
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
}

.doc-frame {
  width: 100%;
  min-height: 70vh;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: #fff;
}

.footer {
  padding: 1rem 1.6rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.9rem;
}

.auth-page .page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 120px);
}

.auth-card {
  width: min(420px, 100%);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
}

.auth-logo {
  text-align: center;
  margin-bottom: 1rem;
}

.auth-title {
  margin: 0;
  text-align: center;
}

.auth-subtitle, .auth-foot {
  text-align: center;
  color: var(--text-muted);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.25rem;
}

.auth-submit {
  width: 100%;
}

.alert-error {
  background: var(--bad-soft);
  color: var(--bad);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  margin-bottom: 0.5rem;
}

code {
  font-family: ui-monospace, Consolas, monospace;
  font-size: 0.85em;
  background: var(--bg-tint);
  padding: 0.05em 0.35em;
  border-radius: 4px;
}