:root {
  --font-sans: "SF Pro Display", "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --bg-canvas: #f4f5f7;
  --bg-elevated: rgba(255, 255, 255, 0.9);
  --bg-solid: #ffffff;
  --text-primary: #101828;
  --text-secondary: #475467;
  --text-tertiary: #667085;
  --line-soft: rgba(16, 24, 40, 0.08);
  --line-strong: rgba(16, 24, 40, 0.14);
  --shadow-sm: 0 10px 30px rgba(16, 24, 40, 0.08);
  --shadow-md: 0 20px 56px rgba(16, 24, 40, 0.12);
  --accent: #2563eb;
  --accent-soft: #dbeafe;
  --success: #027a48;
  --danger: #b42318;
  --danger-soft: #fee4e2;
  --warn: #b54708;
  --warn-soft: #fff4ed;
  --grad-1: rgba(37, 99, 235, 0.08);
  --grad-2: rgba(16, 185, 129, 0.06);
  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 24px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --duration-fast: 140ms;
}

:root[data-theme="dark"] {
  --bg-canvas: #0e1116;
  --bg-elevated: rgba(24, 27, 34, 0.9);
  --bg-solid: #171a21;
  --text-primary: #f3f4f6;
  --text-secondary: #cbd5e1;
  --text-tertiary: #94a3b8;
  --line-soft: rgba(226, 232, 240, 0.14);
  --line-strong: rgba(226, 232, 240, 0.22);
  --shadow-sm: 0 10px 28px rgba(2, 6, 23, 0.55);
  --shadow-md: 0 18px 56px rgba(2, 6, 23, 0.58);
  --accent-soft: rgba(37, 99, 235, 0.28);
  --danger-soft: rgba(180, 35, 24, 0.22);
  --warn-soft: rgba(181, 71, 8, 0.2);
  --grad-1: rgba(37, 99, 235, 0.12);
  --grad-2: rgba(16, 185, 129, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background:
    radial-gradient(1400px 640px at 10% -20%, var(--grad-1) 0%, transparent 60%),
    radial-gradient(900px 540px at 100% -30%, var(--grad-2) 0%, transparent 58%),
    var(--bg-canvas);
  color: var(--text-primary);
  line-height: 1.45;
}

h1,
h2,
h3,
p {
  margin: 0;
}

small {
  color: var(--text-tertiary);
}

.page-shell {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(16px, 2vw, 28px);
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line-soft);
  background: rgba(243, 246, 251, 0.65);
}

.app-header__inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px clamp(16px, 2vw, 28px);
  display: flex;
  gap: var(--space-4);
  justify-content: space-between;
  align-items: center;
}

.brand h1 {
  font-size: clamp(1.2rem, 1.8vw, 1.5rem);
  letter-spacing: -0.02em;
}

.brand p {
  margin-top: 2px;
  color: var(--text-secondary);
}

.top-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.theme-toggle {
  min-width: 92px;
  white-space: nowrap;
}

button {
  appearance: none;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  padding: 10px 16px;
  font-weight: 600;
  transition: transform var(--duration-fast), box-shadow var(--duration-fast), opacity var(--duration-fast);
}

.btn:active {
  transform: translateY(1px) scale(0.99);
}

.btn-primary {
  color: #fff;
  background: var(--accent);
  box-shadow: none;
}

.btn-primary:hover {
  opacity: 0.94;
}

.btn-secondary {
  color: var(--text-primary);
  background: var(--bg-solid);
  border: 1px solid var(--line-soft);
}

.btn-secondary:hover {
  box-shadow: var(--shadow-sm);
}

/* Component library primitives */
.ui-card {
  background: var(--bg-elevated);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.ui-input {
  width: 100%;
  padding: 12px 13px;
  border-radius: 12px;
  border: 1px solid var(--line-strong);
  background: var(--bg-solid);
  color: var(--text-primary);
  font: inherit;
}

.ui-input:focus {
  outline: none;
  border-color: rgba(37, 99, 235, 0.7);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
}

.grid {
  display: grid;
  gap: var(--space-4);
}

.stats-grid {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  margin-top: var(--space-6);
}

.panel-grid {
  margin-top: var(--space-4);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.panel {
  background: var(--bg-elevated);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: var(--space-5);
}

.panel h2 {
  font-size: 1.04rem;
  letter-spacing: -0.01em;
}

.panel + .panel {
  margin-top: var(--space-4);
}

.stat-card {
  min-height: 122px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.stat-card__label {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.stat-card__value {
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  letter-spacing: -0.04em;
  font-weight: 650;
}

.stat-card.danger .stat-card__value {
  color: var(--danger);
}

.stack-list {
  list-style: none;
  padding: 0;
  margin: var(--space-4) 0 0;
  display: grid;
  gap: var(--space-3);
}

.stack-list li {
  background: var(--bg-solid);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  transition: border-color var(--duration-fast), transform var(--duration-fast), box-shadow var(--duration-fast);
}

.stack-list li:hover {
  border-color: var(--line-strong);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(16, 24, 40, 0.06);
}

.source-panel {
  margin-top: var(--space-4);
}

.source-grid {
  list-style: none;
  padding: 0;
  margin: var(--space-4) 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: var(--space-3);
}

.source-grid li {
  display: grid;
  gap: 6px;
  background: var(--bg-solid);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}

.row-title {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 3px 9px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.01em;
  background: #eef2f8;
  color: #344054;
}

.badge.ok {
  background: #dcfae6;
  color: var(--success);
}

.badge.danger {
  background: var(--danger-soft);
  color: var(--danger);
}

.badge.info {
  background: var(--accent-soft);
  color: #1849a9;
}

.banner {
  margin-top: var(--space-4);
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  border: 1px solid transparent;
}

.banner.warn {
  background: var(--warn-soft);
  color: #93370d;
  border-color: #fedf89;
}

.banner.error {
  background: var(--danger-soft);
  color: #912018;
  border-color: #fecdca;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  color: var(--text-secondary);
  margin-top: var(--space-2);
  font-size: 0.92rem;
}

.login-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 22px;
}

.auth-shell {
  width: min(430px, 94vw);
}

.auth-card {
  background: var(--bg-elevated);
  border: 1px solid var(--line-soft);
  border-radius: 22px;
  box-shadow: var(--shadow-md);
  padding: 28px;
}

.auth-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.auth-card .sub {
  margin: 6px 0 0;
  color: var(--text-secondary);
  font-size: 0.94rem;
}

.stack {
  display: grid;
  gap: 14px;
}

.stack label {
  display: grid;
  gap: 8px;
  font-weight: 500;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.stack input {
  width: 100%;
  padding: 12px 13px;
  border-radius: 12px;
  border: 1px solid var(--line-strong);
  background: var(--bg-solid);
  font: inherit;
  color: var(--text-primary);
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
}

.stack input:focus {
  outline: none;
  border-color: rgba(37, 99, 235, 0.7);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
}

.error {
  background: var(--danger-soft);
  border: 1px solid #fecdca;
  color: #912018;
  padding: 10px 12px;
  border-radius: 10px;
  margin-bottom: 12px;
}

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

:root[data-theme="dark"] .btn-secondary {
  color: var(--text-primary);
  background: rgba(17, 24, 39, 0.92);
}

:root[data-theme="dark"] .badge {
  background: rgba(148, 163, 184, 0.22);
  color: #e2e8f0;
}

:root[data-theme="dark"] .badge.ok {
  background: rgba(16, 185, 129, 0.24);
  color: #bbf7d0;
}

:root[data-theme="dark"] .badge.danger {
  background: rgba(244, 63, 94, 0.2);
  color: #fecdd3;
}

@media (max-width: 980px) {
  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .panel-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .app-header__inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .top-actions {
    width: 100%;
    justify-content: stretch;
  }

  .top-actions > * {
    flex: 1;
  }

  .top-actions button,
  .top-actions .btn {
    width: 100%;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .panel {
    padding: var(--space-4);
  }

  .auth-card {
    padding: 22px;
  }

  .auth-header {
    flex-direction: column;
    align-items: stretch;
  }

  .auth-header .theme-toggle {
    width: 100%;
  }
}