* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(180deg, #f3f4f6 0%, #e5e7eb 100%);
  color: #1f2937;
}

a {
  color: #0f766e;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

button,
.button-link,
.button-secondary {
  display: inline-block;
  border: none;
  border-radius: 10px;
  padding: 0.75rem 1rem;
  font: inherit;
  cursor: pointer;
  text-decoration: none;
}

button,
.button-link {
  background: #0f766e;
  color: #ffffff;
}

.button-secondary {
  background: #d1d5db;
  color: #111827;
}

.container {
  width: min(960px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  background: #111827;
  color: #ffffff;
  padding: 1rem 0;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.15);
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  color: #ffffff;
  font-weight: 700;
  font-size: 1.1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-links a,
.nav-text {
  color: #e5e7eb;
}

.main-content {
  padding: 2rem 0 3rem;
}

.card {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(209, 213, 219, 0.9);
  border-radius: 18px;
  padding: 1.5rem;
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
}

.auth-card,
.form-card {
  max-width: 520px;
}

.lead {
  color: #4b5563;
  margin-top: 0;
}

.form-grid {
  display: grid;
  gap: 0.9rem;
}

.form-grid input {
  width: 100%;
  padding: 0.8rem 0.9rem;
  border-radius: 10px;
  border: 1px solid #cbd5e1;
  background: #ffffff;
}

.form-note {
  margin-bottom: 0;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.checkbox-row input {
  width: auto;
}

.button-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.flash-stack {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.flash {
  padding: 0.9rem 1rem;
  border-radius: 12px;
  font-weight: 600;
}

.flash-success {
  background: #d1fae5;
  color: #065f46;
}

.flash-error {
  background: #fee2e2;
  color: #991b1b;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin: 1.25rem 0;
}

.info-item {
  background: #f8fafc;
  border-radius: 14px;
  padding: 1rem;
  border: 1px solid #e5e7eb;
}

.bandwidth-controls {
  display: grid;
  gap: 0.9rem;
  max-width: 360px;
}

.bandwidth-field {
  font-size: 0.9rem;
  font-weight: 600;
  color: #374151;
}

.bandwidth-input {
  width: 100%;
  padding: 0.8rem 0.9rem;
  border-radius: 10px;
  border: 1px solid #cbd5e1;
  background: #ffffff;
}

.info-label {
  display: block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #6b7280;
  margin-bottom: 0.35rem;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
}

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

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  text-align: left;
  padding: 0.85rem 0.5rem;
  border-bottom: 1px solid #e5e7eb;
}

.actions {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.actions form {
  margin: 0;
}

.link-button {
  background: none;
  border: none;
  padding: 0;
  color: #0f766e;
}

.link-button.danger {
  color: #b91c1c;
}

@media (max-width: 640px) {
  .header-row,
  .section-header,
  .nav-links,
  .actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .container {
    width: min(100% - 1rem, 960px);
  }
}