:root {
    --primary-color: #004d4d; /* Dark Teal */
    --accent-color: #008080;
    --bg-color: #f4f7f6;
    --text-color: #333;
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --gradient: linear-gradient(135deg, #004d4d 0%, #008080 100%);
}

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

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

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

.navbar {
    background: var(--white);
    padding: 1rem 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    margin-left: 1.5rem;
    font-weight: 400;
    transition: color 0.3s;
}

nav a:hover {
    color: var(--accent-color);
}

.btn-primary {
    background: var(--gradient);
    color: var(--white) !important;
    padding: 0.5rem 1.2rem;
    border-radius: var(--border-radius);
    font-weight: 600;
}

.content-area {
    padding: 3rem 0;
    min-height: 80vh;
}

.card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

h1, h2, h3 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

/* Authentication Forms */
.auth-form {
    max-width: 400px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.form-group input, .form-group select {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-family: inherit;
}

.btn-block {
    width: 100%;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    margin-top: 1rem;
}

.alert {
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
}

.alert-success { background-color: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.alert-error { background-color: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }
.alert-warning { background-color: #fff3cd; color: #856404; border: 1px solid #ffeeba; }

.footer {
    text-align: center;
    padding: 2rem 0;
    background: var(--primary-color);
    color: var(--white);
    margin-top: 3rem;
}

/* Dashboard Widgets */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, min-minmax(300px, 1fr));
    gap: 1.5rem;
}

.stat-card {
    text-align: center;
    padding: 1.5rem;
}

.stat-card i {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

/* Tabs System */
.tabs-container {
    margin-top: 2rem;
}

.tabs-nav {
    display: flex;
    gap: 0.5rem;
    border-bottom: 2px solid #ddd;
    margin-bottom: 1.5rem;
}

.tab-link {
    padding: 0.8rem 1.5rem;
    cursor: pointer;
    background: #eee;
    border: none;
    border-radius: 8px 8px 0 0;
    font-weight: 600;
    color: #666;
    transition: all 0.3s;
}

.tab-link:hover {
    background: #e0e0e0;
}

.tab-link.active {
    background: var(--primary-color);
    color: white;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.tab-content.active {
    display: block;
}

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

/* Progress bar in dashboard */
.progress-bar-container {
    height: 10px;
    background: #eee;
    border-radius: 5px;
    overflow: hidden;
    flex-grow: 1;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
}