:root {
    --primary-color: #1a237e;    /* น้ำเงินเข้ม */
    --secondary-color: #3949ab;  /* น้ำเงินกลาง */
    --accent-color: #5c6bc0;     /* น้ำเงินอ่อน */
    --light-color: #f5f5f5;      /* เทาอ่อนมาก */
    --dark-color: #0d47a1;       /* น้ำเงินเข้มมาก */
    --success-color: #00c853;    /* เขียวสด */
    --danger-color: #d50000;     /* แดงสด */
    --warning-color: #ffd600;    /* เหลืองสด */
    --info-color: #00b0ff;       /* น้ำเงินสด */
    --text-color: #212121;       /* ดำ */
    --border-color: #e0e0e0;     /* เทาอ่อน */
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --hover-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--light-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* Navbar */
.navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    box-shadow: var(--card-shadow);
    padding: 1rem 2rem;
}

.navbar-brand {
    color: white !important;
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: 1px;
}

.nav-link {
    color: rgba(255,255,255,0.9) !important;
    font-weight: 500;
    padding: 0.5rem 1rem;
    margin: 0 0.2rem;
    border-radius: 5px;
    transition: all 0.3s ease;
}

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

/* Cards */
.card {
    border: none;
    border-radius: 15px;
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
    background-color: white;
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--hover-shadow);
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 15px 15px 0 0 !important;
    padding: 1.2rem;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

/* Buttons */
.btn {
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    border: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

/* Forms */
.form-control {
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 0.8rem 1rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(92, 107, 192, 0.1);
}

/* Tables */
.table {
    background-color: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
}

.table thead th {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 1rem;
    font-weight: 600;
}

.table-hover tbody tr:hover {
    background-color: rgba(92, 107, 192, 0.05);
    transition: all 0.3s ease;
}

/* Status Badges */
.badge {
    padding: 0.6em 1em;
    font-weight: 500;
    border-radius: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

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

.badge-warning {
    background-color: var(--warning-color);
    color: var(--text-color);
}

.badge-info {
    background-color: var(--info-color);
    color: white;
}

/* Project Cards */
.project-card {
    border-left: 5px solid var(--accent-color);
    background: linear-gradient(to right, white, rgba(92, 107, 192, 0.05));
}

.project-card .card-header {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
}

/* Task Items */
.task-item {
    border-left: 4px solid var(--accent-color);
    margin-bottom: 1rem;
    padding: 1rem;
    background-color: var(--primary-color);
    color: white;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
}

.task-item h2,
.task-item h3,
.task-item h4,
.task-item a,
.task-item span,
.task-item p {
    color: white !important;
    text-decoration: none;
}

.task-item .project-title {
    color: white !important;
    font-weight: bold;
}

.task-item:hover {
    transform: translateX(5px);
    box-shadow: var(--hover-shadow);
}

/* Search Bar */
.search-bar {
    background-color: white;
    border-radius: 25px;
    padding: 0.8rem 1.5rem;
    box-shadow: var(--card-shadow);
    display: flex;
    align-items: center;
    transition: all 0.3s ease;
}

.search-bar:focus-within {
    box-shadow: var(--hover-shadow);
    transform: translateY(-2px);
}

.search-bar input {
    border: none;
    background: none;
    outline: none;
    width: 100%;
    padding: 0.5rem;
    font-size: 1rem;
}

/* Dashboard Stats */
.stat-card {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--hover-shadow);
}

.stat-card .stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-card .stat-label {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .navbar {
        padding: 0.8rem 1rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
    
    .stat-card {
        padding: 1.5rem;
    }
    
    .btn {
        padding: 0.6rem 1.2rem;
    }
}