body {
    font-family: 'Inter', sans-serif;
    font-weight: 200;
    font-size: 17px;
    margin: 0;
    padding: 0;
    background: var(--background-color);
    color: var(--text-color);
}

:root {
    --background-color: white;
    --text-color: black;
    --input-background-color: rgba(255, 255, 255, 0.1);
    --input-border-color: #ccc;
    --input-text-color: black;
}

/* Dark Theme */
body.dark {
    --background-color: #121212;
    --text-color: #e0e0e0;
    --input-background-color: rgba(255, 255, 255, 0.1);
    --input-border-color: #e0e0e0;
    --input-text-color: #e0e0e0;
}

/* Premium Theme */
body.premium {
    --background-color: #8a2be2;
    --text-color: #fff;
    --input-background-color: rgba(255, 255, 255, 0.1);
    --input-border-color: #fff;
    --input-text-color: #fff;
}

/* Standard Theme */
body.standard {
    --background-color: #87ceeb;
    --text-color: black;
    --input-background-color: rgba(255, 255, 255, 0.1);
    --input-border-color: #ccc;
    --input-text-color: black;
}

/* Free Theme */
body.free {
    --background-color: white;
    --text-color: black;
    --input-background-color: rgba(0, 0, 0, 0.1);
    --input-border-color: #ccc;
    --input-text-color: black;
}

/* Authentication Forms */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: var(--background-color);
}

.auth-form {
    background: var(--background-color);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    max-width: 400px;
    width: 100%;
}

.auth-form h2 {
    margin-top: 0;
}

.auth-form input,
.auth-form select,
.auth-form button {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid var(--input-border-color);
    background: var(--input-background-color);
    color: var(--input-text-color);
    border-radius: 4px;
}

.hidden {
    display: none;
}

/* Sidebar */
.sidebar {
    width: 250px;
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    background: rgba(0, 0, 0, 0.2);
    color: var(--text-color);
    padding: 20px;
    box-sizing: border-box;
}

.sidebar .user-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-bottom: 20px;
}

.sidebar .user-logo {
    border-radius: 50%;
    margin-bottom: 10px;
    font-size: 80px;
}

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

.sidebar .nav li {
    padding: 10px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.sidebar .nav li a {
    color: var(--text-color);
    text-decoration: none;
}

.sidebar .nav .nav-heading {
    font-weight: bold;
}

.sidebar .upgrade-btn,
.sidebar .logout-btn {
    width: 100%;
    padding: 10px;
    background: var(--upgrade-btn-background, #007bff);
    color: white;
    border: none;
    cursor: pointer;
    margin-bottom: 10px;
}

.main-content {
    margin-left: 270px;
    padding: 20px;
}

.page-heading {
    font-size: 2em;
    margin-left: 30px;
}

/* Profile Page */
.profile-form {
    display: flex;
    flex-direction: column;
    width: 50%;
}

.profile-form input {
    width: calc(100% - 20px);
    padding: 10px;
    margin: 10px 0;
    border: 1px solid var(--input-border-color);
    background: var(--input-background-color);
    color: var(--input-text-color);
    border-radius: 4px;
    box-sizing: border-box;
}

.profile-form button {
    padding: 10px 20px;
    background: #007bff;
    color: white;
    border: none;
    cursor: pointer;
}

/* Settings Page */
.settings-form {
    display: flex;
    flex-direction: column;
    width: 50%;
}

.settings-form select {
    width: calc(100% - 20px);
    padding: 10px;
    margin: 10px 0;
    border: 1px solid var(--input-border-color);
    background: var(--input-background-color);
    color: var(--input-text-color);
    border-radius: 4px;
}

.settings-form button {
    padding: 10px 20px;
    background: #007bff;
    color: white;
    border: none;
    cursor: pointer;
}

/* Subscription Page */
.subscription-card {
    padding: 20px;
    margin: 10px 0;
    background: rgba(0, 0, 0, 0.4); /* 40% black overlay */
    color: var(--text-color);
    border-radius: 4px;
}

/* Refer a Friend Page */
.refer-form {
    display: flex;
    flex-direction: column;
    width: 50%;
}

.refer-form input {
    width: calc(100% - 20px);
    padding: 10px;
    margin: 10px 0;
    border: 1px solid var(--input-border-color);
    background: var(--input-background-color);
    color: var(--input-text-color);
    border-radius: 4px;
    box-sizing: border-box;
}

.refer-form button {
    padding: 10px 20px;
    background: #007bff;
    color: white;
    border: none;
    cursor: pointer;
}