/* General Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f7f2eb;
    color: #000;
    transition: background-color 0.3s, color 0.3s;
}

/* Container */
.container {
    max-width: 800px;
    margin: 50px auto;
    padding: 30px 40px;
    background-color: #fff;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    text-align: center;
    transition: background-color 0.3s, color 0.3s;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
    background-color: #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.navbar .nav-logo {
    font-weight: bold;
    font-size: 1.5rem;
    color: #000;
    text-decoration: none;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 15px;
}

.nav-links li a {
    text-decoration: none;
    color: #000;
    padding: 5px 10px;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.nav-links li a:hover,
.nav-links li a.active {
    background-color: #ddd;
}

/* Mode Toggle */
.mode-toggle {
    background-color: #000;
    color: #fff;
    border: none;
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.3s;
}

.mode-toggle:hover {
    background-color: #333;
}

/* Headings */
h1 {
    margin-bottom: 20px;
}

/* Tabs */
.calculator-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
    gap: 10px;
}

.tab-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    background-color: #f1f1f1;
    cursor: pointer;
    transition: 0.3s;
}

.tab-btn.active {
    background-color: #000;
    color: #fff;
}

.tab-btn:hover {
    background-color: #ddd;
}

/* Input Group */
.input-group, .gpa-row, .cgpa-row {
    margin-bottom: 15px;
    text-align: left;
}

.input-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

input[type="number"] {
    width: 100%;
    padding: 10px 15px;
    border-radius: 8px;
    border: 1px solid #ccc;
    font-size: 16px;
    transition: 0.3s;
}

input[type="number"]:focus {
    border-color: #000;
    outline: none;
}

/* Buttons */
button.calculate-btn {
    background-color: #000;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.3s;
    margin: 5px 0;
}

button.calculate-btn:hover {
    background-color: #333;
}

button.reset-btn {
    background-color: #f1f1f1;
    color: #000;
}

button.reset-btn:hover {
    background-color: #ddd;
}

.copy-btn {
    background-color: #000;
    color: #fff;
    margin-top: 10px;
    display: none;
}

.copy-btn:hover {
    background-color: #333;
}

/* Result Display */
.result {
    font-size: 18px;
    font-weight: 600;
    color: #000;
    min-height: 30px;
}

/* Blog posts */
.blog-post {
    text-align: left;
    margin-bottom: 20px;
}

.blog-post h2 {
    margin-bottom: 8px;
}

/* Dark Mode */
body.dark-mode {
    background-color: #121212;
    color: #fff;
}

body.dark-mode .container {
    background-color: #1e1e1e;
}

body.dark-mode input {
    border-color: #555;
    background-color: #333;
    color: #fff;
}

body.dark-mode .reset-btn {
    background-color: #555;
    color: #fff;
}

body.dark-mode .reset-btn:hover {
    background-color: #777;
}

body.dark-mode .nav-links li a:hover,
body.dark-mode .nav-links li a.active {
    background-color: #333;
}

/* Responsive */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 10px;
    }

    .nav-links {
        flex-direction: column;
    }

    .calculator-tabs {
        flex-direction: column;
    }

    .buttons {
        flex-direction: column;
    }

    .buttons button {
        width: 100%;
        margin-bottom: 10px;
    }
}