/* ========================================
   Navy Blue Theme for Knowledge Management System
   Created: 2025
   ======================================== */

:root {
    /* Navy Blue Color Palette */
    --navy-primary: #1a3a52;
    --navy-secondary: #2c5f7f;
    --navy-light: #4a7ba7;
    --navy-lighter: #6ba3d0;
    --navy-lightest: #e8f1f8;
    --navy-dark: #0f2537;
    
    /* Accent Colors */
    --accent-gold: #ffc107;
    --accent-success: #28a745;
    --accent-danger: #dc3545;
    --accent-warning: #ff9800;
    --accent-info: #17a2b8;
    
    /* Neutral Colors */
    --white: #ffffff;
    --gray-50: #f8f9fa;
    --gray-100: #e9ecef;
    --gray-200: #dee2e6;
    --gray-300: #ced4da;
    --gray-600: #6c757d;
    --gray-800: #343a40;
    --gray-900: #212529;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(26, 58, 82, 0.08);
    --shadow-md: 0 4px 12px rgba(26, 58, 82, 0.12);
    --shadow-lg: 0 8px 24px rgba(26, 58, 82, 0.15);
    --shadow-xl: 0 12px 32px rgba(26, 58, 82, 0.18);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.4s ease;
}

/* ========================================
   Global Styles
   ======================================== */

body {
    font-family: 'Prompt', sans-serif;
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
    color: var(--gray-800);
    min-height: 100vh;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* ========================================
   Navigation / Header
   ======================================== */

.navbar {
    background: linear-gradient(135deg, var(--navy-primary) 0%, var(--navy-secondary) 100%);
    box-shadow: var(--shadow-md);
    padding: 1rem 0;
    transition: var(--transition-base);
}

.navbar-brand {
    color: var(--white) !important;
    font-weight: 600;
    font-size: 1.25rem;
    transition: var(--transition-fast);
    white-space: nowrap; /* ป้องกันตัวอักษรขึ้นบรรทัดใหม่ */
}

.navbar-brand:hover {
    color: var(--accent-gold) !important;
    transform: translateY(-2px);
}

/* Navbar Items Alignment */
.navbar-nav {
    align-items: center;
}

.navbar-nav .nav-item {
    white-space: nowrap;
}

.nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 400;
    padding: 0.5rem 1rem !important;
    transition: var(--transition-fast);
    border-radius: 6px;
}

.nav-link:hover {
    color: var(--white) !important;
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.nav-link.active {
    color: var(--accent-gold) !important;
    font-weight: 500;
}

/* User Icon in Dropdown */
.nav-link .bi-person-circle {
    font-size: 1.2rem;
    margin-right: 0.3rem;
}

/* Dropdown Menu */
.dropdown-menu {
    border: none;
    box-shadow: var(--shadow-lg);
    border-radius: 8px;
    margin-top: 0.5rem;
    min-width: 200px;
}

.dropdown-item {
    padding: 0.7rem 1.5rem;
    transition: var(--transition-fast);
    color: var(--gray-800);
}

.dropdown-item i {
    margin-right: 0.5rem;
    width: 20px;
    text-align: center;
}

.dropdown-item:hover {
    background-color: var(--navy-lightest);
    color: var(--navy-primary);
    padding-left: 1.7rem;
}

.dropdown-item.text-danger:hover {
    background-color: #ffe6e6;
    color: var(--accent-danger);
}

.dropdown-divider {
    margin: 0.5rem 0;
}

/* Form Select in Navbar */
.navbar .form-select {
    border: 2px solid rgba(255, 255, 255, 0.3);
    background-color: rgba(255, 255, 255, 0.95);
    color: var(--navy-primary);
    font-weight: 500;
    transition: var(--transition-base);
    padding: 0.5rem 2rem 0.5rem 0.75rem; /* เพิ่ม padding ขวาเพื่อให้มีที่สำหรับลูกศร */
}

.navbar .form-select:focus {
    border-color: var(--accent-gold);
    box-shadow: 0 0 0 0.2rem rgba(255, 193, 7, 0.25);
    background-color: var(--white);
}

.navbar .form-select:hover {
    border-color: rgba(255, 255, 255, 0.5);
    background-color: var(--white);
}

/* Login Button */
.btn-outline-light {
    border: 2px solid rgba(255, 255, 255, 0.8);
    color: var(--white);
    background-color: transparent;
    transition: var(--transition-base);
}

.btn-outline-light:hover {
    background-color: var(--white);
    color: var(--navy-primary);
    border-color: var(--white);
}

/* Navbar Toggler (Mobile) */
.navbar-toggler {
    border-color: rgba(255, 255, 255, 0.5);
    padding: 0.5rem 0.75rem;
}

.navbar-toggler:focus {
    box-shadow: 0 0 0 0.2rem rgba(255, 255, 255, 0.25);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.8%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Responsive Adjustments */
@media (max-width: 991.98px) {
    .navbar-brand {
        font-size: 1.1rem;
    }
    
    .navbar-nav {
        padding-top: 1rem;
    }
    
    .navbar-nav .nav-item {
        margin-bottom: 0.5rem;
    }
    
    .navbar .form-select {
        width: 100%;
        max-width: none;
    }
    
    .btn-outline-light {
        width: 100%;
        text-align: center;
    }
}

@media (min-width: 992px) {
    /* Desktop: เพิ่มระยะห่างระหว่าง items */
    .navbar-nav .nav-item.ms-lg-2 {
        margin-left: 0.5rem;
    }
}

/* Ensure proper spacing */
.container-fluid {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* ========================================
   Buttons
   ======================================== */

.btn {
    border-radius: 8px;
    padding: 0.6rem 1.5rem;
    font-weight: 500;
    transition: var(--transition-base);
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--navy-secondary) 0%, var(--navy-light) 100%);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--navy-primary) 0%, var(--navy-secondary) 100%);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--gray-600);
    color: var(--white);
}

.btn-secondary:hover {
    background-color: var(--gray-800);
    transform: translateY(-2px);
}

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

.btn-outline-primary:hover {
    background-color: var(--navy-secondary);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-outline-light {
    border: 2px solid rgba(255, 255, 255, 0.8);
    color: var(--white);
    background-color: transparent;
}

.btn-outline-light:hover {
    background-color: var(--white);
    color: var(--navy-primary);
    border-color: var(--white);
}

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

.btn-danger:hover {
    background-color: #c82333;
    transform: translateY(-2px);
}

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

.btn-warning:hover {
    background-color: #e68900;
    transform: translateY(-2px);
}

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

.btn-success:hover {
    background-color: #218838;
    transform: translateY(-2px);
}

.btn-sm {
    padding: 0.4rem 1rem;
    font-size: 0.875rem;
}

/* ========================================
   Cards
   ======================================== */

.card {
    border: none;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    background-color: var(--white);
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.card-header {
    background: linear-gradient(135deg, var(--navy-secondary) 0%, var(--navy-light) 100%);
    color: var(--white);
    font-weight: 600;
    padding: 1.25rem 1.5rem;
    border: none;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    background-color: var(--gray-50);
    border-top: 1px solid var(--gray-200);
    padding: 1rem 1.5rem;
}

/* ========================================
   Tables
   ======================================== */

.table {
    background-color: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.table thead {
    background: linear-gradient(135deg, var(--navy-secondary) 0%, var(--navy-light) 100%);
    color: var(--white);
}

.table thead th {
    border: none;
    padding: 1rem 1.25rem;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.5px;
}

.table tbody td {
    padding: 1rem 1.25rem;
    vertical-align: middle;
    border-bottom: 1px solid var(--gray-100);
}

.table-hover tbody tr {
    transition: var(--transition-fast);
}

.table-hover tbody tr:hover {
    background-color: var(--navy-lightest);
    transform: scale(1.01);
}

.table-striped tbody tr:nth-of-type(odd) {
    background-color: rgba(26, 58, 82, 0.02);
}

/* Category Header in Table */
.category-header {
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-200) 100%);
    font-weight: 600;
    font-size: 1.05rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.category-header:hover {
    background: linear-gradient(135deg, var(--navy-lightest) 0%, var(--gray-200) 100%);
    color: var(--navy-primary);
}

.category-header td {
    padding: 1rem 1.5rem !important;
}

/* ========================================
   Forms
   ======================================== */

.form-control,
.form-select {
    border: 2px solid var(--gray-200);
    border-radius: 8px;
    padding: 0.7rem 1rem;
    transition: var(--transition-base);
    font-family: 'Prompt', sans-serif;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--navy-light);
    box-shadow: 0 0 0 0.2rem rgba(74, 123, 167, 0.25);
    outline: none;
}

.form-control:hover,
.form-select:hover {
    border-color: var(--navy-lighter);
}

.form-label {
    font-weight: 500;
    color: var(--gray-800);
    margin-bottom: 0.5rem;
}

/* ========================================
   Alerts
   ======================================== */

.alert {
    border: none;
    border-radius: 10px;
    padding: 1rem 1.5rem;
    box-shadow: var(--shadow-sm);
}

.alert-info {
    background: linear-gradient(135deg, var(--navy-lightest) 0%, #e3f2fd 100%);
    color: var(--navy-primary);
    border-left: 4px solid var(--navy-light);
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border-left: 4px solid var(--accent-success);
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border-left: 4px solid var(--accent-danger);
}

.alert-warning {
    background-color: #fff3cd;
    color: #856404;
    border-left: 4px solid var(--accent-warning);
}

/* ========================================
   Pagination
   ======================================== */

.pagination {
    margin-top: 2rem;
}

.page-item .page-link {
    color: var(--navy-secondary);
    border: 2px solid var(--gray-200);
    margin: 0 0.25rem;
    border-radius: 8px;
    padding: 0.6rem 1rem;
    transition: var(--transition-fast);
    font-weight: 500;
}

.page-item .page-link:hover {
    background-color: var(--navy-lightest);
    border-color: var(--navy-light);
    color: var(--navy-primary);
    transform: translateY(-2px);
}

.page-item.active .page-link {
    background: linear-gradient(135deg, var(--navy-secondary) 0%, var(--navy-light) 100%);
    border-color: var(--navy-secondary);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

/* ========================================
   Footer
   ======================================== */

footer {
    background: linear-gradient(135deg, var(--gray-900) 0%, var(--navy-dark) 100%);
    color: rgba(255, 255, 255, 0.8);
    padding: 2rem 0;
    margin-top: auto;
}

footer a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition-fast);
}

footer a:hover {
    color: var(--accent-gold);
    text-decoration: none;
}

/* ========================================
   Modal
   ======================================== */

.modal-content {
    border: none;
    border-radius: 12px;
    box-shadow: var(--shadow-xl);
}

.modal-header {
    background: linear-gradient(135deg, var(--navy-secondary) 0%, var(--navy-light) 100%);
    color: var(--white);
    border-radius: 12px 12px 0 0;
    padding: 1.5rem;
    border: none;
}

.modal-header .btn-close {
    filter: brightness(0) invert(1);
}

.modal-body {
    padding: 2rem;
}

.modal-footer {
    background-color: var(--gray-50);
    border-top: 1px solid var(--gray-200);
    padding: 1.25rem 1.5rem;
    border-radius: 0 0 12px 12px;
}

/* ========================================
   Carousel (สำหรับ index.php)
   ======================================== */

.carousel-image-wrapper {
    width: 100%;
    max-height: 400px;
    min-height: 300px;
    height: 400px;
    background: linear-gradient(135deg, #e9ecef 0%, #f8f9fa 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
    border-radius: 8px;
}

.carousel-image {
    max-width: 100%;
    max-height: 400px;
    width: auto;
    height: auto;
    object-fit: contain;
    object-position: center;
    transition: transform var(--transition-base);
}

.carousel-item:hover .carousel-image {
    transform: scale(1.02);
}

.carousel-caption {
    background: linear-gradient(to top, rgba(26, 58, 82, 0.95) 0%, rgba(26, 58, 82, 0.8) 100%);
    padding: 0.8rem 1.5rem;
    border-radius: 10px;
    backdrop-filter: blur(8px);
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: auto;
    max-width: 80%;
}

.carousel-caption p {
    margin: 0;
    font-size: 1rem;
    font-weight: 500;
    color: var(--white);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.caption-click {
    cursor: pointer;
    transition: var(--transition-base);
}

.caption-click:hover {
    transform: scale(1.05);
}

.carousel-control-prev-icon,
.carousel-control-next-icon {
    background-color: rgba(26, 58, 82, 0.7);
    border-radius: 50%;
    padding: 2rem;
    transition: var(--transition-fast);
}

.carousel-control-prev-icon:hover,
.carousel-control-next-icon:hover {
    background-color: var(--navy-secondary);
}

/* Responsive Carousel */
@media (max-width: 1199.98px) {
    .carousel-image-wrapper {
        height: 350px;
        max-height: 350px;
    }
    
    .carousel-image {
        max-height: 350px;
    }
}

@media (max-width: 991.98px) {
    .carousel-image-wrapper {
        height: 300px;
        max-height: 300px;
    }
    
    .carousel-image {
        max-height: 300px;
    }
    
    .carousel-caption {
        padding: 0.7rem 1.2rem;
        max-width: 90%;
    }
    
    .carousel-caption p {
        font-size: 0.95rem;
    }
}

@media (max-width: 767.98px) {
    .carousel-image-wrapper {
        height: 250px;
        max-height: 250px;
    }
    
    .carousel-image {
        max-height: 250px;
    }
    
    .carousel-caption {
        padding: 0.6rem 1rem;
        bottom: 1rem;
        max-width: 95%;
    }
    
    .carousel-caption p {
        font-size: 0.85rem;
    }
    
    .carousel-control-prev-icon,
    .carousel-control-next-icon {
        padding: 1.5rem;
    }
}

@media (max-width: 575.98px) {
    .carousel-image-wrapper {
        height: 200px;
        max-height: 200px;
    }
    
    .carousel-image {
        max-height: 200px;
    }
    
    .carousel-caption {
        padding: 0.5rem 0.8rem;
        bottom: 0.5rem;
    }
    
    .carousel-caption p {
        font-size: 0.8rem;
    }
}

/* ========================================
   Login Page Styles
   ======================================== */

.login-container {
    max-width: 480px;
    width: 100%;
    background: var(--white);
    padding: 3rem 2.5rem;
    border-radius: 16px;
    box-shadow: var(--shadow-xl);
}

.login-container .app-title h1 {
    background: linear-gradient(135deg, var(--navy-primary) 0%, var(--navy-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.btn-login {
    width: 100%;
    height: 48px;
    background: linear-gradient(135deg, var(--navy-secondary) 0%, var(--navy-light) 100%);
    border: none;
    border-radius: 8px;
    color: var(--white);
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition-base);
}

.btn-login:hover {
    background: linear-gradient(135deg, var(--navy-primary) 0%, var(--navy-secondary) 100%);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.btn-login:disabled {
    background: linear-gradient(135deg, var(--gray-300) 0%, var(--gray-400) 100%);
    cursor: not-allowed;
}

/* ========================================
   Profile Page Styles
   ======================================== */

.profile-card {
    max-width: 500px;
    margin: 3rem auto;
    box-shadow: var(--shadow-lg);
    border-radius: 12px;
    overflow: hidden;
    background: var(--white);
}

.profile-header {
    background: linear-gradient(135deg, var(--navy-secondary) 0%, var(--navy-light) 100%);
    color: var(--white);
    text-align: center;
    padding: 2rem;
}

.profile-header h2 {
    margin: 0;
    font-weight: 600;
}

.profile-content {
    padding: 2rem;
}

.profile-content .info {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--gray-100);
}

.profile-content .info:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.profile-content .info h5 {
    font-weight: 600;
    color: var(--navy-primary);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.profile-content .info p {
    color: var(--gray-800);
    font-size: 1.1rem;
    margin: 0;
}

/* ========================================
   Utilities
   ======================================== */

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

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

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

.bg-navy-secondary {
    background-color: var(--navy-secondary) !important;
}

.bg-navy-light {
    background-color: var(--navy-light) !important;
}

.bg-navy-lightest {
    background-color: var(--navy-lightest) !important;
}

/* Loading Spinner */
.spinner-navy {
    border-color: var(--navy-light);
    border-right-color: transparent;
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 768px) {
    .navbar-brand {
        font-size: 1rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
    
    .table {
        font-size: 0.875rem;
    }
    
    .login-container {
        padding: 2rem 1.5rem;
        margin: 1rem;
    }
    
    .carousel-item img {
        max-height: 300px;
    }
    
    .carousel-caption {
        padding: 0.75rem 1rem;
    }
    
    .carousel-caption h5 {
        font-size: 0.9rem;
    }
    
    .carousel-caption p {
        font-size: 0.75rem;
    }
}

/* ========================================
   Animation Classes
   ======================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-right {
    animation: slideInRight 0.5s ease-in-out;
}

/* ========================================
   Custom Scrollbar (Webkit browsers)
   ======================================== */

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--navy-light);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--navy-secondary);
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
    .navbar,
    .btn,
    footer,
    .pagination {
        display: none !important;
    }
    
    .card,
    .table {
        box-shadow: none !important;
        border: 1px solid var(--gray-300);
    }
}