/* Design System Variables */
:root {
    /* Colors */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(120deg, #f093fb 0%, #f5576c 100%);
    --surface-color: #ffffff;
    --background-color: #f3f4f6;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --error-color: #ef4444;
    --success-color: #10b981;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Sarabun', sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: 'Kodchasan', sans-serif;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

a {
    color: #667eea;
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: #764ba2;
}

/* Utilities */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.text-center {
    text-align: center;
}

.mt-5 {
    margin-top: 3rem;
}

.mb-3 {
    margin-bottom: 1rem;
}

.mb-4 {
    margin-bottom: 1.5rem;
}

.d-grid {
    display: grid;
}

.fw-bold {
    font-weight: 600;
}

/* Components */

/* Card */
.card {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}

.card-header {
    background: var(--primary-gradient);
    color: white;
    padding: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.card-body {
    padding: 1.25rem;
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-primary);
    font-family: 'Kodchasan', sans-serif;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    font-family: inherit;
    color: var(--text-primary);
    background-color: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: border-color 0.15s, box-shadow 0.15s;
    outline: none;
}

.form-control:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-check {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.form-check-input {
    width: 1.25em;
    height: 1.25em;
    cursor: pointer;
}

/* Buttons */
.btn {
    display: inline-block;
    font-weight: 500;
    text-align: center;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    font-family: 'Kodchasan', sans-serif;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    opacity: 0.95;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    border: 1px solid transparent;
}

.alert-danger {
    background-color: #fef2f2;
    color: #991b1b;
    border-color: #fecaca;
}

/* Login Specific */
.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--background-color);
    padding: var(--spacing-md);
}

.login-card {
    width: 100%;
    max-width: 400px;
}

/* Navbar */
.navbar {
    background: var(--surface-color);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-lg);
}

.navbar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 1.25rem;
    font-weight: 600;
    color: #667eea;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: 'Kodchasan', sans-serif;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface-color);
    font-family: 'Sarabun', sans-serif;
}

.table th,
.table td {
    padding: 0.35rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    word-wrap: break-word;
    min-width: 35px;
    font-size: 0.8rem;
}

.table th {
    background: #f9fafb;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: normal;
    font-family: 'Kodchasan', sans-serif;
    font-size: 0.9rem;
}

.table tr:hover {
    background-color: #f9fafb;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25em 0.6em;
    font-size: 0.75em;
    font-weight: 700;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: 999px;
}

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

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

.bg-warning {
    background-color: #fef3c7;
    color: #92400e;
}

.bg-info {
    background-color: #dbeafe;
    color: #1e40af;
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.show {
    display: flex;
    opacity: 1;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--surface-color);
    margin: auto;
    padding: 0;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 500px;
    position: relative;
    transform: translateY(-20px);
    transition: transform 0.3s ease;
    animation: slideDown 0.3s forwards;
}

@keyframes slideDown {
    to {
        transform: translateY(0);
    }
}

.modal-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--primary-gradient);
    color: white;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.modal-title {
    margin: 0;
    color: white;
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
}

.btn-close {
    background: transparent;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
}

/* Responsive */
@media (max-width: 576px) {
    .card-body {
        padding: var(--spacing-lg);
    }

    .table th,
    .table td {
        padding: 0.75rem;
    }
}