:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --border: #d9deeb;
  --text: #1b2240;
  --muted: #5f6886;
  --primary: #2e5cff;
  --primary-dark: #2145c3;
  --danger: #d03838;
  --shadow: 0 10px 30px rgba(24, 41, 97, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
}

.login-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.login-card {
  width: min(400px, 100%);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.login-card h2 {
  margin: 0 0 4px;
}

.login-card label {
  font-weight: 600;
  margin-top: 4px;
}

.login-card input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
}

.login-error {
  color: var(--danger);
  margin: 0;
  font-size: 0.95rem;
}

.topbar {
  padding: 24px 18px 12px;
  text-align: center;
}

.topbar h1 {
  margin: 0 0 8px;
  font-size: 1.55rem;
}

.topbar p {
  margin: 0;
  color: var(--muted);
}

.container {
  max-width: 1050px;
  margin: 0 auto;
  padding: 0 16px 90px;
  display: grid;
  gap: 14px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  box-shadow: var(--shadow);
}

.card h2 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.muted {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

label {
  display: block;
  margin: 10px 0 6px;
  font-weight: 600;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 0.98rem;
  background: #fff;
  color: var(--text);
}

textarea {
  resize: vertical;
}

input:focus,
textarea:focus,
button:focus {
  outline: 2px solid rgba(46, 92, 255, 0.28);
  outline-offset: 1px;
}

.row {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.field {
  flex: 1 1 220px;
}

.add-row input {
  flex: 1;
  min-width: 140px;
}

.asin-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 10px;
}

.asin-table th,
.asin-table td {
  border-bottom: 1px solid var(--border);
  text-align: right;
  padding: 8px 6px;
  vertical-align: middle;
}

.asin-table th {
  font-size: 0.9rem;
  color: var(--muted);
  font-weight: 700;
}

.asin-table td code {
  font-family: Consolas, monospace;
}

.status-line {
  margin: 10px 0 6px;
  color: var(--muted);
}

.btn {
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  background: var(--primary);
  color: #fff;
}

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

.btn-secondary {
  background: #eaf0ff;
  color: #21326f;
}

.btn-secondary:hover {
  background: #d8e3ff;
}

.btn-danger {
  background: #ffe7e7;
  color: #7b1f1f;
}

.btn-danger:hover {
  background: #ffd6d6;
}

.btn-primary {
  min-width: 180px;
}

.sticky-footer {
  position: fixed;
  inset-inline: 0;
  bottom: 0;
  padding: 10px 14px;
  display: flex;
  justify-content: center;
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(3px);
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(9, 16, 42, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
}

.modal-content {
  width: min(560px, 100%);
  background: #fff;
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 14px;
}

.modal-content h3 {
  margin: 0 0 8px;
}

.toast {
  position: fixed;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  background: #1f2c5a;
  color: #fff;
  border-radius: 999px;
  padding: 10px 14px;
  font-size: 0.92rem;
  box-shadow: var(--shadow);
  z-index: 30;
}

.toast.error {
  background: #7b1f1f;
}

.hidden {
  display: none !important;
}

a {
  color: var(--primary-dark);
}

@media (max-width: 720px) {
  .container {
    padding-inline: 10px;
  }

  .card {
    padding: 12px;
  }

  .card-head {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }
}