/* =========================
   RESET
========================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
    background-color: #eef2ff;
    color: #1e1b4b;
}

/* =========================
   HEADER
========================= */
.header {
    background: linear-gradient(135deg, #4361ee, #3a0ca3);
    color: white;
    text-align: center;
    padding: 20px;
}

/* =========================
   MENU BAR
========================= */
.menubar {
    background-color: #b8cde6;
    text-align: center;
    padding: 12px;
}

.menubar a {
    color: #2f3e4e;
    text-decoration: none;
    margin: 0 20px;
    font-weight: bold;
    transition: 0.3s;
}

.menubar a:hover {
    color: #4361ee;
}

/* =========================
   MAIN LAYOUT
========================= */
.container {
    display: flex;
    min-height: calc(100vh - 160px);
}

/* =========================
   SIDEBAR
========================= */
.sidebar {
    width: 260px;
    background-color: #e0e7ff;
    padding: 25px;
}

.sidebar h3 {
    margin-bottom: 15px;
}

/* Sidebar Buttons */
.activity-btn {
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    border: none;
    border-radius: 8px;
    background-color: #e6e6e6;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

.activity-btn:hover {
    background-color: #4a90e2;
    color: white;
    transform: translateX(5px);
}

/* =========================
   CONTENT
========================= */
.content {
    flex: 1;
    background-color: #f8f9ff;
    padding: 30px;
}

.page-section h2 {
    margin-bottom: 15px;
}

/* =========================
   ABOUT SECTION
========================= */
.about-section {
    display: flex;
    align-items: center;
    gap: 25px;
}

.profile-img {
    width: 180px;
    height: 180px;
    object-fit: cover;
    border-radius: 12px;
    border: 4px solid #e6ecf5;
}

.about-text p {
    margin-bottom: 12px;
    line-height: 1.6;
}

/* =========================
   GENERAL BUTTON STYLE
========================= */
button {
    padding: 10px 15px;
    border: none;
    border-radius: 8px;
    background: linear-gradient(135deg, #3a86ff, #4361ee);
    color: white;
    cursor: pointer;
    margin: 5px 0;
    transition: 0.3s;
}

button:hover {
    transform: scale(1.05);
}

/* =========================
   INPUTS
========================= */
input {
    padding: 8px;
    margin: 5px 0;
    border-radius: 6px;
    border: 1px solid #ccc;
}

/* =========================
   LIST STYLING
========================= */
ul {
    list-style: none;
    padding-left: 0;
}

ul li {
    background-color: #f0f4fa;
    padding: 8px;
    margin: 5px 0;
    border-radius: 6px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Completed Task */
.completed {
    text-decoration: line-through;
    opacity: 0.6;
}

/* Delete Button */
.deleteBtn {
    background-color: crimson;
    padding: 5px 8px;
    font-size: 12px;
}

/* =========================
   FOOTER
========================= */
.footer {
    background: linear-gradient(135deg, #4361ee, #3a0ca3);
    color: white;
    text-align: center;
    padding: 20px;
}

/* =========================
   THEME TRANSITIONS
========================= */

body,
.content,
.sidebar,
.header,
.footer,
button {
    transition: background-color 0.4s ease,
                color 0.4s ease,
                background 0.4s ease;
}

/* =========================
   LIGHT THEME (DEFAULT)
========================= */

body {
    background-color: #eef2ff;
    color: #1e1b4b;
}

.header,
.footer {
    background: linear-gradient(135deg, #4361ee, #3a0ca3);
    color: white;
}

.sidebar {
    background-color: #e0e7ff;
}

.content {
    background-color: #f8f9ff;
}

/* =========================
   DARK THEME
========================= */

.dark-mode {
    background-color: #1e1e2f;
    color: #f0f0f0;
}

.dark-mode .header,
.dark-mode .footer {
    background: linear-gradient(135deg, #5a189a, #7b2cbf);
}

.dark-mode .sidebar {
    background-color: #24243a;
}

.dark-mode .content {
    background-color: #2b2b3d;
}

.dark-mode button {
    background: linear-gradient(135deg, #5a189a, #7b2cbf);
}

/* =========================
   ALT BACKGROUND (Exercise 3 Toggle)
========================= */

.alt-background .content {
    background-color: #c7d2fe;
}

.grade-box{
    background:#eef2ff;
    padding:20px;
    border-radius:10px;
    max-width:400px;
}

.grade-box input{
    width:100%;
    margin-bottom:10px;
}

/* =========================
   EXERCISE 4 CONTAINER
========================= */

.grade-container{
    background: white;
    padding: 30px;
    border-radius: 12px;
    width: 450px;
    box-shadow: 0 6px 15px rgba(0,0,0,0.15);
    margin-right: 300px;
}

/* Form Layout */

.grade-form{
    margin-top: 15px;
    display: flex;
    flex-direction: column;
}

.grade-form label{
    font-weight: bold;
    margin-top: 10px;
}

.grade-form input{
    padding: 10px;
    border-radius: 6px;
    border: 1px solid #ccc;
}

/* Buttons */

.grade-buttons{
    margin-top: 15px;
}

.grade-buttons button{
    margin-right: 10px;
}

/* =========================
   RESULT BOX
========================= */

.result-container{
    margin-top: 20px;
    padding: 15px;
    border-radius: 8px;
    background: #eef2ff;
    border-left: 5px solid #4361ee;
}

.result-container h3{
    margin-bottom: 8px;
}