* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', sans-serif;
}


/* BODY */

body {
    min-height: 100vh;
    background-color: #0f172a; /* Dark background */
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

/* CONTAINER */
.container {
    width: 100%;
    max-width: 450px;
    background-color: #1e293b; /* Dark card */
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.6);
    margin: auto;
    /* Entry Animation */
    animation: fadeSlide 0.6s ease forwards;
    opacity: 0;
    transform: translateY(30px);
}

@keyframes fadeSlide {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* TITLE */

#title {
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;

}



#title h1 {
    text-align: center;
    margin-bottom: 25px;
    color: #f1f5f9;
    font-weight: 600;
    letter-spacing: 1px;
}

#title #btn {
    width: 80%;
}

/* INPUT FIELD */
#title #todo_input {
    width: 100%;
    padding: 12px 15px;
    font-size: 19px;
    border-radius: 10px;
    border: 1px solid #334155;
    background-color: #0f172a;
    color: #f1f5f9;
    outline: none;
    transition: 0.3s ease;
}

#todo_input:focus {
    border-color: #3b82f6;
    box-shadow: 0 0 8px rgba(59, 130, 246, 0.5);
}

/* MAIN ADD BUTTON */
#btn {
    width: 100%;
    margin-top: 14px;
    margin-bottom: 10px;
    padding: 13px;
    border: none;
    border-radius: 8px;
    background: #22c55e; /* Modern green */
    color: #0f172a;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: all 0.25s ease;
}

#btn:hover {
    background: #16a34a;
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(34, 197, 94, 0.4);
}

#btn:active {
    transform: scale(0.97);
}

/* TODO LIST */
#todo_list {
    margin-top: 20px;
    max-height: 300px;
    overflow: auto;
    scroll-behavior: smooth;
    scroll-snap-type: mandatory;
    scrollbar-color: #334155;
}

#todo_list::-webkit-scrollbar-thumb{
    background: #22c55e;
    border-radius: 10px;
}

#todo_list::-webkit-scrollbar-track{
    background: #0f172a;   /* Change this color */
    border-radius: 10px;
    
}
#todo_list::-webkit-scrollbar{
    background-color: transparent;
}

/* TODO ITEM */
.todo-item {
    background-color: #0f172a;
    border: 1px solid #334155;
    padding: 12px 15px;
    border-radius: 10px;
    margin-bottom: 10px;
    display: flex;
    margin-right: 5px;
    justify-content: space-between;
    align-items: center;
    font-weight: 700;
    text-transform: capitalize;    
    overflow: hidden;

    /* Slide-in animation */
    animation: slideIn 0.3s ease forwards;
    opacity: 0;
    transform: translateX(-20px);
}

@keyframes slideIn {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.todo-item:hover {
    border-color: #3b82f6;
    transform: translateY(-1px);
}

/* TODO TEXT */
.todo-text {
    color: #e2e8f0;
    font-size: 16px;
    flex: 1;
    word-break: break-word;
}

/* TODO ITEM BUTTONS */
.todo-item button {
    padding: 7px 10px;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    font-size: 15px;
    text-transform: capitalize;
    font-weight: 500;
    transition: all 0.2s ease;
    margin-right: 10px;
}

/* Edit Button */
.edit-button {
    background: #3b82f6; /* Blue */
    color: #fff;
}

.edit-button:hover {
    background: #2563eb;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
    transform: scale(1.05);
}

/* Delete Button */
.delete-button {
    background: #ef4444; /* Red */
    color: #fff;
}

.delete-button:hover {
    background: #dc2626;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
    transform: scale(1.05);
}

/* RESPONSIVE DESIGN */
@media (max-width: 768px) {

    .container {
        padding: 25px;
    }

    .container h1 {
        font-size: 22px;
    }

    #todo_input {
        font-size: 14px;
        padding: 10px 12px;
    }

    #btn {
        font-size: 13px;
        padding: 12px;
    }

    .todo-item {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
        display: flex;
        justify-content: center;
        align-items: center;
    }

    .todo-item button {
        width: 80%;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 20px;
        border-radius: 12px;
    }

    .container h1 {
        font-size: 18px;
    }

    #todo_input {
        font-size: 13px;
    }

    .todo-text {
        text-align: center;
    }

    #btn {
        font-size: 13px;
    }


    .todo-text {
        font-size: 13px;
    }
}