/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Page styling */
body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #667eea, #764ba2);
    font-family: Arial, sans-serif;
}

/* Main container */
.todo-container {
    background: #ffffff;
    width: 100%;
    max-width: 420px;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
}

/* Title */
.todo-container h2 {
    text-align: center;
    margin-bottom: 15px;
}

/* Input section */
.input-section {
    display: flex;
    gap: 10px;
}

.input-section input {
    flex: 1;
    padding: 10px;
    font-size: 1rem;
}

.input-section button {
    padding: 10px 15px;
    background: #4caf50;
    border: none;
    color: white;
    cursor: pointer;
    border-radius: 5px;
}

/* Error message */
#errorMsg {
    color: red;
    font-size: 0.9rem;
    margin-top: 5px;
}

/* Task list */
#taskList {
    list-style: none;
    margin-top: 15px;
}

/* Individual task */
.task {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px;
    border-bottom: 1px solid #ddd;
}

/* Completed task */
.task.completed span {
    text-decoration: line-through;
    color: gray;
}

/* Task text */
.task span {
    flex: 1;
    margin-left: 8px;
}

/* Buttons */
.task button {
    margin-left: 5px;
    background: #ff5252;
    border: none;
    color: white;
    padding: 5px 8px;
    cursor: pointer;
    border-radius: 4px;
}

.task .edit {
    background: #2196f3;
}

/* Mobile responsiveness */
@media (max-width: 480px) {
    .todo-container {
        margin: 10px;
    }

    .input-section {
        flex-direction: column;
    }

    .input-section button {
        width: 100%;
    }
}