/* =========================================
   1. VARIABLES & DESIGN SYSTEM
   ========================================= */
:root {
  --primary: #0f4a8a;
  /* Xanh dương đậm chủ đạo */
  --primary-hover: #0d3b70;
  --secondary: #0ea5e9;
  /* Xanh dương nhạt (Sky) */
  --secondary-hover: #0284c7;
  --accent: #d97706;
  /* Màu Vàng Gold sang trọng (Nhấn) */
  --accent-hover: #b45309;
  --bg-color: #f3f4f6;
  /* Xám nhạt làm nền (Gray 100) */
  --surface: #ffffff;
  /* Nền card (Trắng) */
  --text-main: #1f2937;
  /* Chữ đen/xám đậm (Gray 800) */
  --text-muted: #6b7280;
  /* Chữ xám mờ (Gray 500) */
  --border: #e5e7eb;
  /* Viền (Gray 200) */
  --radius: 12px;
  /* Bo góc lớn */
  --radius-sm: 8px;
  /* Bo góc nhỏ */
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
  --font-main: 'Inter', 'Roboto', 'Segoe UI', system-ui, -apple-system, sans-serif;
}

/* =========================================
   2. RESET & BASE
   ========================================= */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

/* =========================================
   3. COMPONENTS
   ========================================= */
/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

.page-content {
  padding-top: 12px;
  padding-bottom: 12px;
}

/* Cards */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 10px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  box-shadow: var(--shadow-hover);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 6px 12px;
  background-color: var(--surface);
  color: var(--text-main);
  border: 1px solid var(--border);
  border-radius: 999px;
  /* Pill shape */
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn:hover {
  background-color: #f9fafb;
  border-color: #d1d5db;
}

.btn-primary {
  background-color: var(--primary) !important;
  color: #fff !important;
  border-color: var(--primary) !important;
}

.btn-primary:hover {
  background-color: var(--primary-hover) !important;
  color: #fff !important;
  border-color: var(--primary-hover) !important;
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--secondary) !important;
  color: #fff !important;
  border-color: var(--secondary) !important;
}

.btn-secondary:hover {
  background-color: var(--secondary-hover) !important;
  color: #fff !important;
}

/* Alerts / Badges */
.badge {
  display: inline-block;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 600;
  background-color: #e0e7ff;
  color: #3730a3;
}

.badge-success {
  background: #dcfce7;
  color: #166534;
}

.badge-warning {
  background: #fef9c3;
  color: #854d0e;
}

.badge-danger {
  background: #fee2e2;
  color: #991b1b;
}

.badge-accent {
  background: var(--accent);
  color: #fff;
}

/* Utilities */
.text-primary {
  color: var(--primary) !important;
}

.text-accent {
  color: var(--accent) !important;
}

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

.bg-primary {
  background-color: var(--primary) !important;
  color: #fff !important;
}

.bg-accent {
  background-color: var(--accent) !important;
  color: #fff !important;
}

/* Table Wrapper for Responsive Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  margin-bottom: 20px;
}

.table-modern {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.table-modern th,
.table-modern td {
  padding: 6px 10px;
  border-bottom: 1px solid var(--border);
}

.table-modern th {
  background-color: #f8fafc;
  font-weight: 600;
  color: var(--text-muted);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.table-modern tbody tr:hover {
  background-color: #f1f5f9;
}