*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --black: #111;
  --white: #fff;
  --gray-50: #fafafa;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-400: #a3a3a3;
  --gray-500: #737373;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
  --gray-900: #171717;
  --green: #16a34a;
  --red: #dc2626;
  --blue: #2563eb;
  --blue-hover: #1d4ed8;
  --radius: 6px;
  --max-width: 960px;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--white);
  color: var(--black);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: var(--white);
  border-bottom: 2px solid var(--black);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--black);
  text-decoration: none;
  letter-spacing: -0.5px;
}

.logo:hover {
  opacity: 0.8;
}

#nav-auth {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
}

.user-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--gray-300);
}

main {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 32px 20px;
}

h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 12px;
}

h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

p {
  margin-bottom: 12px;
  color: var(--gray-600);
}

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 0.875rem;
  font-weight: 500;
  font-family: inherit;
  border: 2px solid var(--black);
  background: var(--white);
  color: var(--black);
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.1s, color 0.1s;
  line-height: 1.4;
}

.btn:hover {
  background: var(--black);
  color: var(--white);
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--gray-800);
}

.btn-success {
  border-color: var(--green);
  color: var(--green);
}

.btn-success:hover {
  background: var(--green);
  color: var(--white);
}

.btn-danger {
  border-color: var(--red);
  color: var(--red);
}

.btn-danger:hover {
  background: var(--red);
  color: var(--white);
}

.btn-sm {
  padding: 4px 10px;
  font-size: 0.75rem;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--gray-700);
}

.form-group .hint {
  font-size: 0.75rem;
  color: var(--gray-400);
  margin-top: 2px;
}

input[type="text"],
input[type="url"],
input[type="number"],
input[type="password"],
select,
textarea {
  width: 100%;
  padding: 8px 12px;
  font-size: 0.875rem;
  font-family: inherit;
  border: 2px solid var(--black);
  border-radius: var(--radius);
  background: var(--white);
  color: var(--black);
  outline: none;
  transition: border-color 0.1s;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--blue);
}

textarea {
  resize: vertical;
  min-height: 80px;
}

select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23111' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 28px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.card {
  border: 2px solid var(--black);
  border-radius: var(--radius);
  padding: 20px;
  background: var(--white);
  margin-bottom: 16px;
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
}

.card-meta {
  font-size: 0.75rem;
  color: var(--gray-500);
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.card-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: 0.6875rem;
  font-weight: 600;
  border: 1px solid var(--black);
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-green {
  background: var(--green);
  color: var(--white);
  border-color: var(--green);
}

.badge-red {
  background: var(--red);
  color: var(--white);
  border-color: var(--red);
}

.badge-gray {
  background: var(--gray-200);
  color: var(--gray-700);
  border-color: var(--gray-300);
}

.empty-state {
  text-align: center;
  padding: 60px 20px;
  border: 2px dashed var(--gray-300);
  border-radius: var(--radius);
}

.empty-state h2 {
  margin-bottom: 8px;
}

.empty-state p {
  margin-bottom: 20px;
  color: var(--gray-500);
}

.landing {
  text-align: center;
  padding: 80px 20px 40px;
}

.landing h1 {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.landing p {
  font-size: 1.125rem;
  color: var(--gray-600);
  max-width: 540px;
  margin: 0 auto 24px;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 40px;
}

.feature-card {
  border: 2px solid var(--black);
  border-radius: var(--radius);
  padding: 24px;
  text-align: left;
}

.feature-card h3 {
  margin-bottom: 4px;
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--gray-600);
  margin-bottom: 0;
}

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

.table th,
.table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--gray-200);
}

.table th {
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--gray-500);
}

.table tr:hover {
  background: var(--gray-50);
}

.inline-form {
  display: flex;
  gap: 8px;
  align-items: flex-end;
}

.inline-form .form-group {
  flex: 1;
  margin-bottom: 0;
}

.alert {
  padding: 10px 14px;
  border-radius: var(--radius);
  font-size: 0.875rem;
  margin-bottom: 16px;
  border: 2px solid var(--black);
}

.alert-error {
  background: #fef2f2;
  border-color: var(--red);
  color: var(--red);
}

.alert-success {
  background: #f0fdf4;
  border-color: var(--green);
  color: var(--green);
}

.alert-info {
  background: #eff6ff;
  border-color: var(--blue);
  color: var(--blue);
}

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--gray-300);
  border-top-color: var(--black);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading {
  text-align: center;
  padding: 40px;
  color: var(--gray-500);
}

.text-sm {
  font-size: 0.8125rem;
}

.text-muted {
  color: var(--gray-500);
}

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mt-2 { margin-top: 16px; }

.hidden {
  display: none !important;
}

#ebay-options,
#trigger-options {
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  padding: 14px;
  margin-top: 8px;
  background: var(--gray-50);
}

pre {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 12px;
  font-size: 0.8125rem;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

@media (max-width: 640px) {
  .form-row {
    grid-template-columns: 1fr;
  }

  .landing h1 {
    font-size: 1.75rem;
  }

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

  .card-header {
    flex-direction: column;
  }
}