:root {
    --primary-color: #2e8b57; /* Calm Green */
    --secondary-color: #4682b4; /* Steel Blue */
    --accent-color: #ffd700; /* Gold */
    --dark-bg: #1e1e2d;
    --dark-card: #2b2b40;
    --light-bg: #f5f8fa;
    --text-dark: #333;
    --text-light: #f5f5f5;
    --text-muted: #888;
    --danger: #e74c3c;
    --success: #2ecc71;
    --sidebar-width: 250px;
    --border-radius: 12px;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--light-bg);
    color: var(--text-dark);
    transition: background-color 0.3s, color 0.3s;
}

body.dark-mode {
    background-color: var(--dark-bg);
    color: var(--text-light);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
}

/* Layout */
.wrapper {
    display: flex;
    width: 100%;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: #fff;
    box-shadow: 2px 0 10px rgba(0,0,0,0.05);
    position: fixed;
    height: 100vh;
    z-index: 100;
    transition: 0.3s;
}

.dark-mode .sidebar {
    background: var(--dark-card);
    box-shadow: 2px 0 10px rgba(0,0,0,0.2);
}

.sidebar .logo {
    padding: 20px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-align: center;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.sidebar ul {
    list-style: none;
    padding: 20px 0;
    margin: 0;
}

.sidebar ul li a {
    display: flex;
    align-items: center;
    padding: 15px 25px;
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: 0.2s;
}

.dark-mode .sidebar ul li a {
    color: var(--text-light);
}

.sidebar ul li a:hover, .sidebar ul li.active a {
    background: rgba(46, 139, 87, 0.1);
    color: var(--primary-color);
    border-right: 4px solid var(--primary-color);
}

.sidebar ul li a i {
    margin-right: 15px;
    font-size: 1.2rem;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 30px;
    transition: 0.3s;
}

/* Cards */
.custom-card {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.03);
    margin-bottom: 20px;
    border: none;
    transition: transform 0.2s, box-shadow 0.2s;
}

.custom-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.08);
}

.dark-mode .custom-card {
    background: var(--dark-card);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

/* Mobile Nav */
.mobile-nav {
    display: none;
    position: fixed;
    bottom: 0;
    width: 100%;
    background: #fff;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
    z-index: 1000;
    padding: 10px 0;
}

.dark-mode .mobile-nav {
    background: var(--dark-card);
}

.mobile-nav ul {
    display: flex;
    justify-content: space-around;
    list-style: none;
    margin: 0;
    padding: 0;
}

.mobile-nav ul li a {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.8rem;
}

.mobile-nav ul li a i {
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.mobile-nav ul li.active a {
    color: var(--primary-color);
}

/* Buttons */
.btn-primary-custom {
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 10px 20px;
    font-weight: 500;
    transition: 0.3s;
}

.btn-primary-custom:hover {
    background: #236e44;
    color: #fff;
}

/* Progress Bar */
.progress {
    height: 10px;
    border-radius: 5px;
}

/* Utils */
.text-primary-custom {
    color: var(--primary-color) !important;
}

/* Landing Page */
.hero-section {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--light-bg) 0%, #e0f7fa 100%);
}

.dark-mode .hero-section {
    background: linear-gradient(135deg, var(--dark-bg) 0%, #1a252c 100%);
}

/* Media Queries */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .main-content {
        margin-left: 0;
        padding-bottom: 80px; /* space for mobile nav */
    }
    .mobile-nav {
        display: block;
    }
}