/* 
 * COLOR PALETTE & VARIABLES 
 */
:root {
    --primary-100: #2E8B57; /* Sea Green */
    --primary-200: #61bc84;
    --primary-300: #c6ffe6;
    --accent-100: #8FBC8F;  /* Dark Sea Green */
    --accent-200: #345e37;
    --text-100: #FFFFFF;
    --text-200: #e0e0e0;
    --bg-100: #1E1E1E;      /* Main Background */
    --bg-200: #2d2d2d;      /* Card/Sidebar Background */
    --bg-300: #454545;      /* Inputs/Borders */
    
    --transition-speed: 0.3s;
    --danger: #dc3545;
    --warning: #ffc107;
}

/* 
 * GLOBAL STYLES (HCI: Consistency & Material Design)
 */
body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--bg-100); /* 60% Rule: Dark Background */
    color: var(--text-200);
    overflow-x: hidden;
    margin: 0;
    padding: 0;
}

/* Scrollbar styling */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-100); }
::-webkit-scrollbar-thumb { background: var(--bg-300); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary-100); }

/* 
 * PRELOADER 
 */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-100);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s ease;
}
.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid var(--bg-300);
    border-top: 5px solid var(--primary-100);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* 
 * SIDEBAR (Navigation)
 */
.sidebar {
    height: 100vh;
    width: 260px;
    position: fixed;
    top: 0;
    left: 0;
    background-color: var(--bg-200);
    border-right: 1px solid var(--bg-300);
    padding-top: 20px;
    transition: var(--transition-speed);
    z-index: 1000;
}

.sidebar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-100);
    text-align: center;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.sidebar-brand i { color: var(--primary-100); }

.nav-link {
    color: var(--text-200);
    padding: 12px 20px;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 15px;
    transition: all 0.2s;
    border-left: 4px solid transparent;
    text-decoration: none;
}

.nav-link:hover {
    color: var(--text-100);
    background-color: var(--bg-300);
    border-left: 4px solid var(--accent-100); /* 10% Rule: Hover Accent */
}

.nav-link.active {
    background-color: rgba(46, 139, 87, 0.1);
    color: var(--primary-100); /* 30% Rule: Primary color for active state */
    border-left: 4px solid var(--primary-100);
}

/* 
 * MAIN CONTENT 
 */
.main-content {
    margin-left: 260px;
    padding: 20px;
    transition: var(--transition-speed);
}

/* Topbar */
.topbar {
    background-color: var(--bg-200);
    padding: 15px 30px;
    border-radius: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
}

.toggle-btn {
    color: var(--text-100);
    font-size: 1.2rem;
    cursor: pointer;
    display: none; /* Hidden on desktop */
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}
.user-avatar {
    width: 40px;
    height: 40px;
    background-color: var(--primary-200);
    color: var(--bg-100);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
}

/* 
 * DASHBOARD CARDS (Material Design Cards)
 */
.stat-card {
    background-color: var(--bg-200);
    border: none;
    border-radius: 12px;
    padding: 20px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.2);
    transition: transform 0.2s;
    height: 100%;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 12px rgba(0,0,0,0.3);
}

.stat-icon {
    font-size: 2.5rem;
    color: var(--primary-100);
    opacity: 0.8;
    margin-bottom: 10px;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-100);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-200);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* 
 * TABLES & FORMS 
 */
.custom-table-container {
    background-color: var(--bg-200);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.2);
}

.table-dark-custom {
    --bs-table-bg: var(--bg-200);
    --bs-table-striped-bg: var(--bg-300);
    color: var(--text-200);
    border-color: var(--bg-300);
}

.table-dark-custom th {
    color: var(--primary-200);
    border-bottom: 2px solid var(--primary-100);
}

/* Buttons */
.btn-primary-custom {
    background-color: var(--primary-100);
    border: none;
    color: var(--text-100);
    padding: 8px 20px;
    border-radius: 6px;
    transition: 0.2s;
}
.btn-primary-custom:hover {
    background-color: var(--primary-200);
    color: var(--bg-100);
}

/* Bootstrap Alert Override */
.alert-custom {
    background-color: var(--accent-200);
    color: var(--primary-300);
    border: 1px solid var(--primary-100);
    border-radius: 8px;
}

/* Form Inputs */
.form-control {
    background-color: var(--bg-300);
    border: 1px solid var(--bg-300);
    color: var(--text-100);
}
.form-control:focus {
    background-color: var(--bg-300);
    border-color: var(--primary-100);
    box-shadow: 0 0 0 0.25rem rgba(46, 139, 87, 0.25);
    color: var(--text-100);
}

.form-control-dark {
    background-color: var(--bg-100);
    border: 1px solid var(--bg-300);
    color: var(--text-100);
}
.form-control-dark:focus {
    background-color: var(--bg-100);
    border-color: var(--primary-100);
    color: var(--text-100);
    box-shadow: none;
}

/* 
 * RESPONSIVENESS 
 */
@media (max-width: 768px) {
    .sidebar { left: -260px; }
    .sidebar.active { left: 0; }
    .main-content { margin-left: 0; }
    .toggle-btn { display: block; }
    .overlay {
        display: none;
        position: fixed;
        top: 0; left: 0; width: 100%; height: 100%;
        background: rgba(0,0,0,0.5);
        z-index: 999;
    }
    .overlay.active { display: block; }
}