:root {
  --bg: #f6f8fb;
  --card: #ffffff;
  --text: #1f2933;
  --muted: #5f6b76;
  --border: #d8dee6;
  --primary: #1f5fbf;
  --primary-hover: #174c98;
  --secondary: #eef2f7;
  --danger: #c0392b;
  --success: #1b8f48;
  --info: #1b75d1;
  --shadow: 0 8px 20px rgba(17, 24, 39, 0.07);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  line-height: 1.6;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.15s ease, background-color 0.15s ease;
}

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

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 18px 40px;
}

header {
  margin-bottom: 18px;
}

nav {
  display: flex;
  gap: 12px;
  margin-top: 10px;
}

nav a {
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--text);
  background: transparent;
  border: 1px solid transparent;
}

nav a:hover {
  background: var(--secondary);
  color: var(--primary-hover);
  border-color: var(--border);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 16px;
}

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

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

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

table thead {
  background: #edf2f9;
  color: #1b2533;
}

table th,
table td {
  padding: 10px 12px;
  font-size: 14px;
  border-bottom: 1px solid var(--border);
}

table th {
  text-align: left;
  font-weight: 600;
}

table tbody tr:nth-child(even) {
  background: #f8fafc;
}

table tbody tr:hover {
  background: #eef3fb;
}

button,
.btn,
.btn:visited {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  text-decoration: none;
}

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

.btn-secondary {
  background: var(--secondary);
  color: var(--text);
  border-color: var(--border);
}

.btn-secondary:hover {
  background: #e1e6ee;
  color: var(--primary-hover);
}

.btn-danger {
  background: var(--danger);
  border-color: #a93226;
  color: #fff;
}

.btn-danger:hover {
  background: #a93226;
}

.btn-link {
  background: transparent;
  color: var(--primary);
  border-color: transparent;
  padding: 0;
}

input,
select,
textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  font-size: 14px;
  color: var(--text);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(31, 95, 191, 0.15);
}

label {
  font-weight: 600;
  color: var(--text);
}

.flash-container {
  margin-bottom: 16px;
}

.alert {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  margin-bottom: 8px;
  font-weight: 600;
}

.alert-success {
  background: #e8f4ed;
  color: #1e5634;
  border-color: #c4e3cd;
}

.alert-error {
  background: #fdecea;
  color: #7b241c;
  border-color: #f5c6cb;
}

.alert-info {
  background: #e8f2ff;
  color: #1f4b99;
  border-color: #c8d8f4;
}

main {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .container {
    padding: 18px 14px 28px;
  }

  nav {
    flex-wrap: wrap;
  }

  table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

  .actions {
    gap: 6px;
  }
}