/* Main Styles with Thai Sarabun Font */
@import url('https://fonts.googleapis.com/css2?family=Sarabun:wght@300;400;500;600;700&display=swap');

:root {
    /* Corporate Identity: Red & White Theme - Assumption College Lamnarai */
    --primary-color: #C41E3A;
    --primary-hover: #9B1B30;
    --primary-light: #FFE4E8;
    --secondary-color: #6B7280;
    --success-color: #059669;
    --danger-color: #DC2626;
    --warning-color: #D97706;
    --bg-color: #F3F4F6;
    --card-bg: #ffffff;
    --text-color: #1F2937;
    --text-muted: #6B7280;
    --border-color: #FECDD3;
    --shadow: 0 1px 3px rgba(196, 30, 58, 0.1);
    --shadow-lg: 0 10px 25px rgba(196, 30, 58, 0.15);
    --school-red: #C41E3A;
    --school-red-dark: #9B1B30;
    --school-red-light: #FFE4E8;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Sarabun', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.container-sm {
    max-width: 600px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: 1rem;
}

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

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-family: 'Sarabun', sans-serif;
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    text-decoration: none;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
    min-height: 44px; /* Touch-friendly */
}

.btn:focus {
    outline: 2px solid var(--school-red);
    outline-offset: 2px;
}

.btn-primary {
    background-color: var(--school-red);
    color: white;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.btn-primary:hover {
    background-color: var(--school-red-dark);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(196, 30, 58, 0.3);
}

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

.btn-secondary:hover {
    background-color: #475569;
    color: white;
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

.btn-success:hover {
    background-color: #059669;
    color: white;
}

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

.btn-danger:hover {
    background-color: #dc2626;
    color: white;
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-color);
}

.btn-outline:hover {
    border-color: var(--school-red);
    color: var(--school-red);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-block {
    display: block;
    width: 100%;
}

/* Cards */
.card {
    background-color: var(--card-bg);
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.card-header {
    padding: 1.25rem;
    border-bottom: 2px solid var(--school-red-light);
    background-color: var(--school-red-light);
    color: var(--school-red-dark);
}

.card-header h3,
.card-header h4 {
    color: var(--school-red);
    margin-bottom: 0;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    padding: 1.25rem;
    border-top: 1px solid var(--border-color);
    background-color: #f8fafc;
}

/* Forms */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    font-family: 'Sarabun', sans-serif;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    background-color: white;
    transition: border-color 0.2s, box-shadow 0.2s;
    min-height: 44px;
}

.form-control:focus {
    outline: none;
    border-color: var(--school-red);
    box-shadow: 0 0 0 3px rgba(196, 30, 58, 0.15);
}

.form-control::placeholder {
    color: #94a3b8;
}

select.form-control {
    cursor: pointer;
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

.form-text {
    font-size: 0.875rem;
    color: var(--secondary-color);
    margin-top: 0.25rem;
}

/* Alerts */
.alert {
    padding: 1rem 1.25rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
}

.alert-success {
    background-color: #d1fae5;
    border-color: #a7f3d0;
    color: #065f46;
}

.alert-danger {
    background-color: #fee2e2;
    border-color: #fecaca;
    color: #991b1b;
}

.alert-warning {
    background-color: #fef3c7;
    border-color: #fde68a;
    color: #92400e;
}

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

/* Navigation */
.navbar {
    background-color: var(--card-bg);
    box-shadow: var(--shadow);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--school-red);
}

.navbar-brand img {
    height: 40px;
    width: auto;
    margin-right: 0.75rem;
    vertical-align: middle;
}

.navbar-nav {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}

.navbar-nav a {
    color: var(--text-color);
    font-weight: 500;
}

.navbar-nav a:hover {
    color: var(--school-red);
}

/* Grid System */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: -0.75rem;
}

.col {
    flex: 1;
    padding: 0.75rem;
}

.col-12 { flex: 0 0 100%; max-width: 100%; }
.col-6 { flex: 0 0 50%; max-width: 50%; }
.col-4 { flex: 0 0 33.333%; max-width: 33.333%; }
.col-3 { flex: 0 0 25%; max-width: 25%; }

@media (min-width: 768px) {
    .col-md-12 { flex: 0 0 100%; max-width: 100%; }
    .col-md-6 { flex: 0 0 50%; max-width: 50%; }
    .col-md-4 { flex: 0 0 33.333%; max-width: 33.333%; }
    .col-md-3 { flex: 0 0 25%; max-width: 25%; }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 3rem; }

.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 1rem; }
.p-4 { padding: 1.5rem; }
.p-5 { padding: 3rem; }

.d-flex { display: flex; }
.justify-content-between { justify-content: space-between; }
.align-items-center { align-items: center; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }

/* Login Page */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

/* School Logo Styling */
.school-logo {
    width: 120px;
    height: 120px;
    object-fit: contain;
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.1));
}

.school-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--school-red);
    margin-bottom: 0.5rem;
    text-align: center;
}

.school-name-sub {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    text-align: center;
}

.login-box {
    width: 100%;
    max-width: 480px;
    background: white;
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    padding: 2.5rem;
    border-top: 5px solid var(--school-red);
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-header h1 {
    color: var(--school-red);
    margin-bottom: 0.5rem;
    font-size: 1.75rem;
}

.login-header p {
    color: var(--secondary-color);
}

/* Tables */
.table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 0.5rem;
    overflow: hidden;
}

.table th,
.table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    background-color: var(--school-red-light);
    font-weight: 600;
    color: var(--school-red-dark);
}

.table tbody tr:hover {
    background-color: #f8fafc;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 9999px;
    text-transform: uppercase;
}

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

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

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

.badge-info {
    background-color: var(--school-red-light);
    color: var(--school-red-dark);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    
    .btn {
        padding: 0.875rem 1.25rem;
    }
    
    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .navbar-nav {
        gap: 1rem;
    }
    
    .table {
        display: block;
        overflow-x: auto;
    }
}

/* Focus styles for accessibility */
*:focus-visible {
    outline: 2px solid var(--school-red);
    outline-offset: 2px;
}

/* Disable text selection where needed */
.no-select {
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}