@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap');

:root {
  --font-primary: 'Inter', sans-serif;
  --color-bg: #f4f6fc;
  --color-surface: #ffffff;
  --color-primary: #1a237e;
  --color-primary-light: #534bae;
  --color-accent: #ffca28;
  --color-text: #2e3a59;
  --color-muted: #6c7b95;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --radius-sm: 4px;
  --radius-md: 8px;
  --shadow-sm: 0 1px 4px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
}

/* Global box-sizing */
*, *::before, *::after {
  box-sizing: border-box;
}

/* Base styles */
body {
  margin: 0;
  padding: 0;
  font-family: var(--font-primary);
  background-color: var(--color-bg);
  color: var(--color-text);
}
.container {
  width: 90%;
  max-width: 1200px;
  margin: var(--spacing-lg) auto;
  padding: var(--spacing-lg);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}
.container-fluid {
  width: 90%;
  padding: var(--spacing-lg);
  margin: 0 auto;
}

/* Navbar */
.main-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
  padding: 0 var(--spacing-lg);
  height: 56px;
  box-shadow: var(--shadow-sm);
  border-bottom: 4px solid var(--color-accent);
}
.main-nav .logo {
  color: #fff;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}
.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
}
.main-nav ul li {
  margin-left: calc(var(--spacing-md) * 1.5);
  transition: transform 0.2s;
}
.main-nav ul li:hover {
  transform: translateY(-2px);
}
.main-nav ul li a {
  color: #fff;
  text-decoration: none;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s;
  position: relative;
}
.main-nav ul li a::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 3px;
  background-color: var(--color-accent);
  transition: width 0.3s ease;
}
.main-nav ul li a:hover::after,
.main-nav ul li a.active::after {
  width: 100%;
}
.main-nav ul li a.active,
.main-nav ul li a:hover {
  background-color: var(--color-primary-light);
}
.nav-right .btn-logout {
  background-color: #e53935;
  margin-left: var(--spacing-md);
  color: #fff;
  font-weight: 600;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: background-color 0.2s;
}
.nav-right .btn-logout:hover {
  background-color: #ab000d;
}

/* Headings */
h1, h2, h3, h4, h5 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

/* Cards */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s, box-shadow 0.2s;
  margin-bottom: var(--spacing-lg);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.card-body {
  padding: var(--spacing-md);
}
.card-title {
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
}

/* Buttons */
.btn, .btn-small {
  font-family: var(--font-primary);
  border: none;
  border-radius: var(--radius-sm);
  padding: var(--spacing-xs) var(--spacing-md);
  background-color: var(--color-accent);
  color: var(--color-text);
  cursor: pointer;
  transition: background-color 0.2s;
  text-decoration: none;
  display: inline-block;
}
.btn:hover, .btn-small:hover {
  background-color: var(--color-primary);
  color: #fff;
}
.btn-secondary {
  background-color: var(--color-primary);
  color: #fff;
}
.btn-secondary:hover {
  background-color: var(--color-primary-light);
}
.btn-danger {
  background-color: #e53935;
}
.btn-danger:hover {
  background-color: #ab000d;
}

/* Forms and inputs */
input, select, textarea {
  font-family: var(--font-primary);
  padding: var(--spacing-sm);
  border: 1px solid #ccc;
  border-radius: var(--radius-sm);
  transition: border-color 0.2s, box-shadow 0.2s;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.2);
}
.form-inline .form-control {
  margin-right: var(--spacing-sm);
}

/* Tables */
table {
  width: 100% !important;
  border-collapse: collapse;
  margin-bottom: var(--spacing-lg);
  table-layout: auto;
}
/* Prevent table headers and cells from wrapping vertically */
.table-responsive .table th,
.table-responsive .table td {
  white-space: nowrap;
}

/* Ensure responsive tables scroll horizontally on small screens */
.table-responsive {
  overflow-x: auto;
}

/* Table header styling */
.table-responsive .table thead {
  background-color: var(--color-primary);
  color: #fff;
}

.table-responsive .table th,
.table-responsive .table td {
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid #e0e0e0;
  text-align: left;
}

.table-responsive .table tbody tr:hover {
  background-color: #eef1fc;
}

/* Utility classes */
.text-center { text-align: center; }
.mb-3 { margin-bottom: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-md); }

/* Tablet and below */
@media (max-width: 1440px) {
  .container {
    padding: var(--spacing-md);
  }
  .form-inline {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }
  .main-nav {
    flex-direction: column;
    align-items: flex-start;
    height: auto;
  }
  .main-nav ul {
    flex-direction: column;
    width: 100%;
  }
  .main-nav ul li {
    margin: var(--spacing-xs) 0 var(--spacing-xs) var(--spacing-lg);
  }
}

/* Mobile */
@media (max-width: 1440px) {
  .table-responsive {
    font-size: 0.875rem;
  }
  .main-nav .logo {
    padding-left: var(--spacing-md);
  }
}

/* Make the table fill its container and size columns automatically */
.table-responsive > .table {
  width: 100% !important;      /* fill parent */
  table-layout: auto !important;/* let browser size each column by content */
}
.table-responsive .table th,
.table-responsive .table td {
  white-space: nowrap;         /* prevent cells from wrapping into multiple lines */
}

/* ให้ container สูงสุด 90% ของหน้าจอ และกึ่งกลาง */
.container-fluid {
  max-width: 90%;
  margin: 0 auto;
}

/* ไม่ต้องให้ header ตกแนวตั้งอีก */
.table thead th {
  writing-mode: horizontal-tb !important;
  transform: none           !important;
  white-space: nowrap;
  vertical-align: middle;
}

/* เพิ่ม Padding ให้เซลล์อ่านง่ายขึ้น */
.table th,
.table td {
  padding: 0.75rem 1rem;
}

/* ปรับขนาดปุ่มจัดการ ให้ไม่ล้น */
.btn {
  white-space: nowrap;
}

/* Media Query สำหรับจอเล็ก */
@media (max-width: 768px) {
  .table-responsive {
    margin-bottom: 1rem;
  }
  /* ย่อลงอีกนิด */
  .table th,
  .table td {
    padding: 0.5rem;
    font-size: 0.9rem;
  }
}