:root {
  --color-primary: #171717;
  --color-on-primary: #ffffff;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-background: #ffffff;
  --color-surface: #f8fafc;
  --color-foreground: #171717;
  --color-muted: #64748b;
  --color-border: #e5e7eb;
  --color-destructive: #dc2626;
  --color-success-bg: #ecfdf5;
  --color-success-text: #047857;
  --color-error-bg: #fef2f2;
  --color-error-text: #b91c1c;
  --radius: 10px;
  --shadow: 0 1px 3px rgb(0 0 0 / 0.06);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  background: var(--color-background);
  color: var(--color-foreground);
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}

.header {
  margin-bottom: 32px;
}

.header h1 {
  margin: 0 0 8px;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.header p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0;
}

.tab {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--color-muted);
  padding: 10px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
  margin-bottom: -1px;
}

.tab:hover {
  color: var(--color-foreground);
}

.tab.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.tab:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.panel {
  display: none;
}

.panel.active {
  display: block;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.875rem;
  font-weight: 500;
}

input[type="url"],
input[type="number"] {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: #fff;
  color: var(--color-foreground);
  font-size: 16px;
  margin-bottom: 16px;
  transition: border-color 0.2s ease;
}

input[type="url"]:focus,
input[type="number"]:focus {
  border-color: var(--color-accent);
}

input[type="number"] {
  width: 88px;
  margin-bottom: 0;
}

button {
  border: none;
  border-radius: var(--radius);
  padding: 12px 20px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, opacity 0.2s ease;
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  width: 100%;
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-accent-hover);
}

.btn-danger {
  background: var(--color-destructive);
  color: #fff;
}

.btn-danger:hover {
  opacity: 0.9;
}

.btn-secondary {
  background: #fff;
  color: var(--color-foreground);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-surface);
}

.alert {
  margin-bottom: 20px;
  padding: 12px 14px;
  border-radius: var(--radius);
  font-size: 0.875rem;
}

.alert-success {
  background: var(--color-success-bg);
  color: var(--color-success-text);
  border: 1px solid #a7f3d0;
}

.alert-error {
  background: var(--color-error-bg);
  color: var(--color-error-text);
  border: 1px solid #fecaca;
}

.alert a {
  color: inherit;
  font-weight: 500;
}

.stat {
  margin-bottom: 16px;
  padding: 12px 14px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.875rem;
  color: var(--color-muted);
}

.stat strong {
  color: var(--color-foreground);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

th,
td {
  text-align: left;
  padding: 12px 10px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

th {
  color: var(--color-muted);
  font-weight: 500;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

td a {
  color: var(--color-accent);
  word-break: break-all;
}

.empty {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin: 0;
}

.hint {
  margin-top: 12px;
  font-size: 0.8rem;
  color: var(--color-muted);
}

@media (max-width: 640px) {
  .page {
    padding: 20px 12px 48px;
  }

  .card {
    padding: 16px;
  }

  table,
  thead,
  tbody,
  th,
  td,
  tr {
    display: block;
  }

  th {
    display: none;
  }

  tr {
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border);
  }

  td {
    border: none;
    padding: 4px 0;
  }

  td::before {
    content: attr(data-label);
    display: block;
    color: var(--color-muted);
    font-size: 0.75rem;
    margin-bottom: 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}