:root {
    --bg-color: #121212;
    --sidebar-color: #1e1e1e;
    --card-color: #252525;
    --text-color: #e0e0e0;
    --accent-color: #bb86fc;
    --secondary-color: #03dac6;
    --error-color: #cf6679;
    --border-color: #333;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 250px;
    background-color: var(--sidebar-color);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 20px 0;
}

.sidebar-header {
    padding: 0 20px 20px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
    font-weight: bold;
    font-size: 1.2rem;
    color: var(--accent-color);
}

.nav-item {
    padding: 12px 20px;
    color: var(--text-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    transition: background 0.3s;
}

.nav-item:hover,
.nav-item.active {
    background-color: rgba(187, 134, 252, 0.1);
    color: var(--accent-color);
}

.nav-item i {
    margin-right: 10px;
    width: 20px;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.card {
    background-color: var(--card-color);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

.btn {
    padding: 10px 20px;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    font-weight: 600;
    transition: opacity 0.3s;
}

.btn-primary {
    background-color: var(--accent-color);
    color: #000;
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: #000;
}

.btn:hover {
    opacity: 0.8;
}

/* Forms */
.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
}

input,
select,
textarea {
    width: 100%;
    padding: 10px;
    background-color: #333;
    border: 1px solid var(--border-color);
    color: white;
    border-radius: 4px;
    box-sizing: border-box;
}

/* Login Page */
.login-container {
    width: 100%;
    max-width: 400px;
    margin: 100px auto;
}