body {
    font-family: Arial, sans-serif;
    background: linear-gradient(to bottom right, #a0e9ff, #f0f8ff);
    display: flex;
    justify-content: center;
    padding-top: 50px;
    transition: 0.3s;
}

body.dark {
    background: #121212;
    color: #eee;
}

.container {
    background-color: #fff;
    padding: 25px 30px;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    width: 450px;
    transition: 0.3s;
}

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

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 20px;
}

body.dark h1 {
    color: #eee;
}

.input-section {
    display: flex;
    gap: 5px;
    margin-bottom: 15px;
}

input[type="text"], input[type="time"], select {
    padding: 10px;
    font-size: 14px;
    border-radius: 6px;
    border: 1px solid #ccc;
    flex: 1;
}

button {
    padding: 10px 12px;
    background-color: #4caf50;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: 0.2s;
}

button:hover {
    background-color: #45a049;
}

.task-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 14px;
}

#clear-all {
    background-color: #f44336;
}

#clear-all:hover {
    background-color: #d32f2f;
}

#theme-toggle {
    background-color: #2196f3;
}

#theme-toggle:hover {
    background-color: #1976d2;
}

ul {
    list-style: none;
    padding: 0;
}

li {
    padding: 10px;
    border-bottom: 1px solid #ccc;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: 0.2s;
}

body.dark li {
    border-bottom: 1px solid #555;
}

li:hover {
    background-color: #f1f1f1;
}

body.dark li:hover {
    background-color: #333;
}

li.completed span {
    text-decoration: line-through;
    color: #888;
}

li button {
    background-color: red;
    padding: 5px 8px;
    font-size: 12px;
    border-radius: 3px;
}

li button:hover {
    background-color: darkred;
}

/* Progress Bar */
.progress-container {
    width: 100%;
    background-color: #ddd;
    height: 12px;
    border-radius: 6px;
    margin-bottom: 15px;
    overflow: hidden;
}

#progress-bar {
    height: 12px;
    width: 0%;
    background-color: #4caf50;
    border-radius: 6px;
    transition: width 0.3s;
}

/* Category Colors */
li[data-category="Work"] { background-color: #ffe0b2; }
li[data-category="Study"] { background-color: #b3e5fc; }
li[data-category="Health"] { background-color: #c8e6c9; }
li[data-category="Personal"] { background-color: #f8bbd0; }