/* ============================================================
   Air Cargo Marketplace — frontend stylesheet
   Minimal but legible. System fonts. No framework.
   ============================================================ */

:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-alt: #f0f2f5;
  --border: #d9dde3;
  --border-strong: #b6bcc6;
  --text: #1a1f2b;
  --text-muted: #5b6373;
  --primary: #1d4ed8;
  --primary-hover: #1e40af;
  --primary-text: #ffffff;
  --danger: #b91c1c;
  --danger-bg: #fef2f2;
  --warning: #92400e;
  --warning-bg: #fffbeb;
  --success: #166534;
  --success-bg: #f0fdf4;
  --code-bg: #0f172a;
  --code-text: #e2e8f0;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.05), 0 1px 3px rgba(15, 23, 42, 0.04);
  --radius: 6px;
  --radius-sm: 4px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  min-height: 100vh;
}

/* ----------- layout ----------- */

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 20px 64px;
}

.container--narrow {
  max-width: 460px;
}

header.app-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

header.app-header .brand {
  font-weight: 600;
  font-size: 16px;
  color: var(--text);
  text-decoration: none;
}

header.app-header .brand .brand-mark {
  display: inline-block;
  width: 22px;
  height: 22px;
  background: var(--primary);
  border-radius: 4px;
  margin-right: 8px;
  vertical-align: -5px;
}

header.app-header nav {
  display: flex;
  gap: 16px;
  align-items: center;
  font-size: 14px;
}

header.app-header nav a {
  color: var(--text-muted);
  text-decoration: none;
}

header.app-header nav a:hover {
  color: var(--text);
}

header.app-header .who {
  color: var(--text-muted);
  font-size: 13px;
}

header.app-header .who button {
  margin-left: 8px;
}

footer.app-footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 12px;
  padding: 24px 20px;
}

/* ----------- typography ----------- */

h1 {
  font-size: 24px;
  margin: 0 0 8px;
  font-weight: 600;
}

h2 {
  font-size: 18px;
  margin: 24px 0 12px;
  font-weight: 600;
}

h3 {
  font-size: 15px;
  margin: 16px 0 8px;
  font-weight: 600;
}

p {
  margin: 0 0 12px;
}

.lede {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 20px;
}

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

a:hover {
  text-decoration: underline;
}

code,
.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 13px;
  background: var(--surface-alt);
  padding: 1px 5px;
  border-radius: 3px;
}

pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 12px 14px;
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.45;
}

pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

/* ----------- forms ----------- */

.form-group {
  margin-bottom: 14px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 4px;
  color: var(--text);
}

.form-group .hint {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 3px;
}

.form-group .field-error {
  display: block;
  font-size: 12px;
  color: var(--danger);
  margin-top: 3px;
  min-height: 16px;
}

input[type="text"],
input[type="password"],
input[type="email"],
input[type="number"],
input[type="date"],
input[type="datetime-local"],
input[type="url"],
select,
textarea {
  display: block;
  width: 100%;
  padding: 8px 10px;
  font: inherit;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 0.12s, box-shadow 0.12s;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.12);
}

input[type="checkbox"] {
  width: auto;
  margin-right: 6px;
  vertical-align: -2px;
}

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

.field-invalid input,
.field-invalid select,
.field-invalid textarea {
  border-color: var(--danger);
  background: var(--danger-bg);
}

.field-invalid input:focus,
.field-invalid select:focus,
.field-invalid textarea:focus {
  box-shadow: 0 0 0 3px rgba(185, 28, 28, 0.15);
}

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

@media (max-width: 600px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

/* ----------- buttons ----------- */

button,
.btn {
  display: inline-block;
  font: inherit;
  font-size: 14px;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
  line-height: 1.2;
  transition: background 0.12s, border-color 0.12s;
}

button:hover,
.btn:hover {
  background: var(--surface-alt);
}

button:disabled,
.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn--primary,
button.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-text);
}

.btn--primary:hover,
button.primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}

.btn--ghost {
  background: transparent;
  border-color: transparent;
  color: var(--primary);
  padding: 6px 8px;
}

.btn--ghost:hover {
  background: var(--surface-alt);
  text-decoration: none;
}

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

.btn--danger:hover {
  background: var(--danger-bg);
}

.button-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  margin-top: 16px;
}

.button-row .spacer {
  flex: 1;
}

/* ----------- cards / sections ----------- */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  margin-bottom: 16px;
}

.card--feature {
  background: linear-gradient(180deg, #eef2ff, var(--surface));
  border-color: #c7d2fe;
}

.card .card-title {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 6px;
}

.card .card-sub {
  color: var(--text-muted);
  font-size: 13px;
  margin: 0 0 14px;
}

.section-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 720px) {
  .section-grid {
    grid-template-columns: 1fr;
  }
}

.section-grid--feature {
  grid-template-columns: 1.4fr 1fr;
}

@media (max-width: 720px) {
  .section-grid--feature {
    grid-template-columns: 1fr;
  }
}

/* ----------- tables ----------- */

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

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

.table th {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  font-weight: 600;
  background: var(--surface-alt);
}

.table tr:last-child td {
  border-bottom: none;
}

.table tr.clickable {
  cursor: pointer;
}

.table tr.clickable:hover {
  background: var(--surface-alt);
}

.table .empty {
  text-align: center;
  color: var(--text-muted);
  padding: 24px 12px;
  font-style: italic;
}

.summary-cell {
  color: var(--text-muted);
  font-size: 13px;
}

/* ----------- badges / pills ----------- */

.badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--surface-alt);
  color: var(--text-muted);
  border: 1px solid var(--border);
  line-height: 1.4;
}

.badge--published {
  background: var(--success-bg);
  color: var(--success);
  border-color: #bbf7d0;
}

.badge--draft {
  background: #eff6ff;
  color: #1d4ed8;
  border-color: #bfdbfe;
}

.badge--valid {
  background: var(--success-bg);
  color: var(--success);
  border-color: #bbf7d0;
}

.badge--invalid {
  background: var(--danger-bg);
  color: var(--danger);
  border-color: #fecaca;
}

.badge--warning {
  background: var(--warning-bg);
  color: var(--warning);
  border-color: #fde68a;
}

.badge--expired,
.badge--cancelled {
  background: var(--surface-alt);
  color: var(--text-muted);
}

/* ----------- alert / inline messages ----------- */

.alert {
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  margin-bottom: 12px;
  border: 1px solid var(--border);
}

.alert--error {
  background: var(--danger-bg);
  color: var(--danger);
  border-color: #fecaca;
}

.alert--warning {
  background: var(--warning-bg);
  color: var(--warning);
  border-color: #fde68a;
}

.alert--info {
  background: #eff6ff;
  color: #1e40af;
  border-color: #bfdbfe;
}

.alert--success {
  background: var(--success-bg);
  color: var(--success);
  border-color: #bbf7d0;
}

.alert ul {
  margin: 0;
  padding-left: 18px;
}

.alert li {
  margin: 2px 0;
}

.alert code {
  background: rgba(0, 0, 0, 0.05);
}

/* ----------- misc ----------- */

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

.small {
  font-size: 12px;
}

.row {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.spacer {
  flex: 1;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 24px 0;
}

.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
}

.steps li {
  position: relative;
  padding: 8px 0 8px 36px;
  border-bottom: 1px solid var(--border);
  counter-increment: step;
}

.steps li:last-child {
  border-bottom: none;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 8px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--primary-text);
  font-size: 12px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}

.kv {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 6px 14px;
  font-size: 13px;
}

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

.kv dd {
  margin: 0;
  word-break: break-all;
}

.copyable {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  cursor: pointer;
}

.copyable:hover {
  background: var(--surface);
  border-color: var(--border-strong);
}

.copyable .copied {
  color: var(--success);
}

.hidden {
  display: none !important;
}

/* spinner */

.spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid var(--border-strong);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: -2px;
}

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