:root {
    --primary-color: #1ABC9C;
    --secondary-color: #F39C12;
    --background-color: #F4F6F9;
    --surface-color: #FFFFFF;
    --text-color: #333333;
    --light-gray-color: #EAEAEA;
    --font-family: 'Poppins', sans-serif;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 70px 0 20px;
}

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    background-color: var(--surface-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 10px 0;
    z-index: 1000;
}

.nav-link {
    color: var(--text-color);
    text-decoration: none;
    padding: 10px 20px;
    margin: 0 10px;
    border-radius: 8px;
    transition: background-color 0.3s, color 0.3s;
}

.nav-link.active, .nav-link:hover {
    background-color: var(--primary-color);
    color: var(--surface-color);
}

#app {
    padding: 20px;
}

.page {
    display: none;
}

.page.active {
    display: block;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.card {
    background-color: var(--surface-color);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.card.full-width {
    grid-column: 1 / -1;
}

.xp-bar-container {
    background-color: var(--light-gray-color);
    border-radius: 10px;
    height: 20px;
    overflow: hidden;
    margin: 10px 0;
}

.xp-bar {
    background-color: var(--primary-color);
    height: 100%;
    border-radius: 10px;
    transition: width 0.5s ease-in-out;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 5px;
}

.calendar-day {
    background-color: var(--light-gray-color);
    height: 40px;
    border-radius: 5px;
}

.calendar-day.active {
    background-color: var(--primary-color);
}

form {
    display: flex;
    flex-direction: column;
    gap: 15px;
    max-width: 400px;
}

select, input, button {
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--light-gray-color);
    font-size: 16px;
}

button {
    background-color: var(--primary-color);
    color: var(--surface-color);
    border: none;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    opacity: 0.9;
}

.settings-container {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--light-gray-color);
}