body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #0d0d0d, #1a1a1a);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0;
    padding: 15px;
    color: #eaeaea;
}

.todo-app { 
    width: 100%;
    max-width: 520px;
    background: #1c1c1c;
    padding: 30px;
    border-radius: 14px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.7), 0 0 10px rgba(0, 255, 255, 0.05);
    transition: 0.3s;
}

.todo-app h2 {
    text-align: center;
    margin-bottom: 20px;
    color: #f5f5f5;
    font-size: 24px;
    font-weight: 600;
    letter-spacing: 1px;
    text-shadow: 0 0 6px rgba(0, 255, 255, 0.3);
}
.row {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

input {
    flex: 1;
    border: 1px solid #333;
    border-radius: 8px;
    padding: 12px;
    font-size: 15px;
    outline: none;
    background: #2a2a2a;
    color: #f1f1f1;
    box-shadow: inset 0 2px 6px rgba(0,0,0,0.6);
}

input:focus {
    border-color: #00ffff;
    box-shadow: 0 0 8px #00ffff66;
}

.add-btn {
    background: #00bfff;
    color: #fff;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.3s;
    box-shadow: 0 3px 8px rgba(0,191,255,0.4);
}
.add-btn:hover {
    background: #0099cc;
    box-shadow: 0 0 12px #00bfff88;
}

ul {
    padding: 0;
    margin: 0;
}

ul li {
    list-style: none;
    background: #252525;
    margin-bottom: 12px;
    padding: 12px 15px;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: 0.3s;
    flex-wrap: wrap;
    gap: 8px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.5);
}

ul li:hover {
    background: #2f2f2f;
    box-shadow: 0 0 12px rgba(0,255,255,0.1);
}
ul li.done {
    background: #1e2e1e;
    text-decoration: line-through;
    color: #8dd08d;
    box-shadow: 0 0 12px rgba(0,255,128,0.25);
}

ul li .task-text {
    flex: 1;
    font-size: 15px;
}

ul li button {
    border: none;
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    transition: 0.3s;
    font-weight: 500;
}

ul li .done-btn {
    background: #28a745;
    color: #fff;
    box-shadow: 0 3px 8px rgba(40,167,69,0.4);
}
ul li .done-btn:hover {
    background: #218838;
    box-shadow: 0 0 12px #28a74588;
}

ul li .edit-btn {
    background: #ffc107;
    color: #222;
    box-shadow: 0 3px 8px rgba(255,193,7,0.4);
}

ul li .edit-btn:hover {
    background: #e0a800;
    color: #fff;
    box-shadow: 0 0 12px #ffc10788;
}

ul li .delete-btn {
    background: #dc3545;
    color: #fff;
    box-shadow: 0 3px 8px rgba(220,53,69,0.4);
}

ul li .delete-btn:hover {
    background: #b02a37;
    box-shadow: 0 0 12px #dc354588;
}
@media (max-width: 600px) {
    .row {
        flex-direction: column;
    }
    .add-btn {
        width: 100%;
    }
    ul li {
        flex-direction: column;
        align-items: flex-start;
}
}