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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: url('https://cdn.pixabay.com/photo/2021/05/14/08/44/running-6252827_960_720.jpg') no-repeat center center fixed;
    background-size: cover;
    color: #fff;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 20px;
}

/* Overlay for better text readability */
body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    z-index: -1;
}

/* Container styling */
.container {
    background: linear-gradient(135deg, #8b4513, #daa520);
    margin-top: 120px;
    width: 100%;
    max-width: 500px;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: transform 0.3s ease;
}

.container:hover {
    transform: translateY(-5px);
}

/* Header */
h1 {
    color: #fff;
    background: linear-gradient(135deg, #4a0e0e, #8b4513);
    padding: 20px;
    font-size: 32px;
    font-weight: 700;
    text-align: center;
    letter-spacing: 1px;
    text-shadow: 2px 2px 6px rgba(0, 0, 0, 0.5);
    margin: 0;
}

/* Input field */
input[type="text"] {
    width: 100%;
    padding: 16px 20px;
    font-size: 18px;
    border: none;
    outline: none;
    background: rgba(255, 255, 255, 0.9);
    color: #333;
    border-bottom: 3px solid #daa520;
    transition: all 0.3s ease;
    font-weight: 500;
}

input[type="text"]:focus {                                 /*இது ஒரு text input என்பதை குறிக்கிறது (அதாவது <input type="text">).*/
    background: #fff;
    box-shadow: 0 0 10px rgba(218, 165, 32, 0.5);
}

/* List styles */
ul {
    list-style: none;
    padding: 0;
    margin: 0;
    max-height: 400px;
    overflow-y: auto;
}

ul::-webkit-scrollbar {
    width: 6px;
}

ul::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
}

ul::-webkit-scrollbar-thumb {
    background: #daa520;
    border-radius: 3px;
}

/* List item styling */
li {
    padding: 16px 20px;
    background: rgba(255, 255, 255, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 18px;
    transition: background 0.3s ease, transform 0.2s ease;
}

li:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.02);
}

/* Delete button (X) */
span {
    background: #ff4d4d;
    color: white;
    width: 28px;
    height: 28px;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    font-weight: bold;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s ease, transform 0.2s ease;
}

span:hover {
    background: #c0392b;
    transform: scale(1.1);
}

/* Completed task style */
.brown {
    color: #ccc;
    text-decoration: line-through;
    opacity: 0.7;
    font-style: italic;
}

/* 
Animation  => @keyframes
responsive => @media
*/

/* Responsive adjustments */
@media (max-width: 576px) {
    .container {
        margin-top: 60px;
        width: 95%;
        max-width: 100%;
        border-radius: 12px;
    }

    h1 {
        font-size: 28px;
        padding: 16px;
    }

    input[type="text"],
    li {
        font-size: 16px;
        padding: 14px;
    }

    body {
        padding: 10px;
    }
}

/* Optional: Add subtle animation when new task is added */
li {
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Fade out animation */
@keyframes fadeOut {
    to {
        opacity: 0;
        transform: translateX(-20px);
    }
}

li.fadeOut {
    animation: fadeOut 0.6s forwards;
}