style.css

body {
    font-family: 'Arial', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background: linear-gradient(135deg, #1d2b64, #c42152);
    color: #16c1ec;
    padding: 20px;
    box-sizing: border-box;
}

.nav{
    position: fixed;
    bottom: 0;
    width: 100%;
    height: 55px;
    box-shadow: 0 0 3px rgba(0, 0, 0, 0.2);
    background: linear-gradient(180deg, #8391c4, #ad3d5e);
    overflow-x: auto;
    display: flex;
}

.nav-link{
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex-grow: 1;
    min-width: 50px;
    overflow: hidden;
    white-space: nowrap;
    font-family: sans-serif;
    font-size: 14px;
    color: rgba(0, 0, 0, 0.8);;
    text-decoration: none;
    -webkit-tap-highlight-color: transparent;
    transition:background-color 0.1s ease-in-out;
    border-radius: 10px;
    color: black;
}

.nav-link:hover{
    cursor: pointer;
    background: #2E94E3;
    box-shadow: 0 0 30px #2E94E3;
    color: black;
    border-radius: 10px;
}

.nav-icon{
    font-size: 18px;
}

.nav-link:focus { 
    color: white; 
    transform: scale(1.05);
    transition: transform 0.1s ease-in-out, box-shadow 0.1s ease-in-out; 
}


                     /*STOPWATCH CSS*/

.container{
    top: 50%;
    left: 50%;
    width: 40%;
    min-width: 500px;
    transform: translate(-50%,-50%);
    padding-top: 0;
    padding-bottom: 20px;
    position: absolute;
    border: 1px solid black;
    background: rgba(0, 0, 0, 0.8);
    border-radius: 10px;
    box-shadow: rgba(0,0,0,0.4) 0px 2px 4px,
                rgba(0,0,0,0.3) 0px 7px 13px -3px,
                rgba(0,0,0,0.2) 0px -3px 0px inset;            
} 

#timer-display{
    width: 100%;
    background: white;
    padding: 40px 0;
    border-radius: 4px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 4rem;
    color: rgba(0, 0, 0, 0.8);
}

#laps{
    color: azure;
    text-align: center;
    margin-top: 10px;
    text-decoration: none;
    max-height: 150px;
    overflow-y: auto;
    padding-bottom: 20px;
}

.action{
    width: 85%;
    margin: 60px auto 0 auto;
    display: grid;
    grid-template-columns: repeat(3,1fr);
    grid-gap: 30px;
}

.action button{
    padding: 10px 20px;
    color: white;
    background: #2E94E3;
    border-radius: 1px solid black;
    border-radius: 8px;
    font-size: 18px;
    cursor: pointer;
    box-shadow: rgba(0,0,0,0.4) 0px 2px 4px,
                rgba(0,0,0,0.3) 0px 7px 13px -3px,
                rgba(0,0,0,0.2) 0px -3px 0px inset;
}

.action button:hover{
    cursor: pointer;
    background: #2E94E3;
    box-shadow: 0 0 30px #2E94E3;
    color: white;
    padding: 7px 17px;
}

h1{
    text-align: center;
    margin-top: 18px;
    font-family: 'Times New Roman', Times, serif;
    font-size:xx-large;
    color: white;
}

@media (max-width: 767.98px) {
    .container {
        width: 80%;
        min-width: auto;
        padding-bottom: 20px;
    }

    #timer-display {
        font-size: 2.5rem;
        padding: 30px 0;
    }

    .action {
        grid-template-columns: 1fr;
        grid-gap: 20px;
    }

    .action button {
        font-size: 16px;
        padding: 3px 15px;
    }

    h1 {
        font-size: large;
        margin-top: 18px;
    }
    #laps{
        max-height: 100px;
    }
}

@media (min-width: 768px) and (max-width: 991.98px) {
    .container {
        width: 60%;
    }

    #timer-display {
        font-size: 3rem;
        padding: 35px 0;
    }

    .action {
        grid-template-columns: repeat(2, 1fr);
        grid-gap: 25px;
    }

    .action button {
        font-size: 17px;
        padding: 9px 18px;
    }

    h1 {
        font-size: x-large;
        margin-top: 18px;
    }
    #laps{
        max-height: 130px;
    }
}

@media (min-width: 992px) and (max-width: 1199.98px) {
    .container {
        width: 50%;
    }

    #timer-display {
        font-size: 3.5rem;
        padding: 38px 0;
    }

    .action {
        grid-template-columns: repeat(3, 1fr);
        grid-gap: 28px;
    }

    .action button {
        font-size: 18px;
        padding: 10px 20px;
    }

    h1 {
        font-size: xx-large;
        margin-top: 18px;
    }
    #laps{
        max-height: 140px;
    }
}

                     /*ALARM CLOCK CSS*/


::-webkit-scrollbar{
    display: none;
}

.alarm{
    border: 3px solid #2E94E3;
    border-radius: 8px;
}

.alarm h1{
    color: white;
}

.datetime{
    color: #fff;
    background: #22222b;
    font-family: "Segoe UI", sans-serif;
    width: 340px;
    padding: 15px 10px;
    transition: 0.4s;
    transition-property: background,box-shadow;
    
}

.datetime:hover{
    background: #2E94E3;
    box-shadow: 0 0 30px #2E94E3;
    border-radius: 5px;
}

.date{
    font-size: 20px;
    font-weight: 600;
    text-align: center;
    letter-spacing: 3px;
}

.time{
    font-size: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.time span:not(:last-child){
    position: relative;
    max-width: 0 6px;
    font-weight: 600;
    text-align: center;
}

.time span:last-child{
    background: #2E94E3;
    font-size: 30px;
    font-weight: 600;
    text-transform: uppercase;
    margin-top: 10px;
    padding: 0 5px;
    border-radius: 3px;
}

hr{
    border: 1px solid #2E94E3;
    margin: 20px auto;
}

.setAlarm{
    display: flex;
    justify-content: space-around;
    border-radius: 10px;
}

.column select{
    background: #10101E;
    color: #fff;
    text-align: center;
    padding: 8px 4px;
    border: 1px solid #2E94E3;
    border-radius: 18px;
}


#btn-setAlarm, .btn-delete, #stopAlarm{
    padding: 5px;
    color: #fff;
    background: #2E94E3;
    border: 1px solid #2E94E3;
    border-radius: 18px;
}

#stopAlarm{
    visibility: hidden;
    width: 100px;
    margin: 0 34%;
}

.btn-delete{
    margin-left: 50px;
}

#btn-setAlarm:hover, .btn-delete:hover, #stopAlarm:hover{
    cursor: pointer;
    background: #2E94E3;
    box-shadow: 0 0 30px #2E94E3;
    color: white;
}

h3{
    
    font-family: 'Arial', sans-serif;
    font-size: 20px;
    font-weight: 900;
    text-align: center;
    margin-bottom: 3%;
}

.alarmList{
    color:white;
    margin: 14px auto;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: space-evenly;
    max-height: 50px;
    overflow-y: auto;
    padding-bottom: 20px;
}

.alarmLog{
    font-size: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 6px auto;
}

@media (max-width: 767.98px) {
    .datetime {
        width: 100%;
        padding: 10px 0.5px;
    }

    .date {
        font-size: 16px;
    }

    .time {
        font-size: 40px;
    }

    .time span:last-child {
        font-size: 20px;
        margin-top: 5px;
    }

    .setAlarm {
        flex-direction: column;
        align-items: center;
    }

    .column select {
        width: 100%;
        margin-bottom: 10px;
    }

    #stopAlarm {
        width: 80px;
        margin: 10px px;
    }

    .btn-delete {
        margin: 10px 0 0 0;
    }

    h3 {
        font-size: 18px;
        margin-bottom: 5%;
    }

    .alarmLog {
        font-size: 20px;
    }
    .btn-delete{
        margin-left: 30px;
    }
}

@media (min-width: 768px) and (max-width: 991.98px) {
    .datetime {
        width: 100%;
        padding: 10px 0.5px;
    }

    .date {
        font-size: 18px;
    }

    .time {
        font-size: 50px;
    }

    .time span:last-child {
        font-size: 25px;
        margin-top: 8px;
    }

    .setAlarm {
        flex-direction: row;
        justify-content: space-between;
    }

    .column select {
        width: 85%;
    }

    #stopAlarm {
        width: 90px;
        margin: 0 32%;
    }

    h3 {
        font-size: 19px;
    }

    .alarmLog {
        font-size: 25px;
    }
    .btn-delete{
        margin-left: 30px;
    }
}

 @media (min-width: 992px) and (max-width: 1199.98px) {
    .datetime {
        width: 100%;
        padding: 10px 0.5px;
    }

    .date {
        font-size: 20px;
    }

    .time {
        font-size: 55px;
    }

    .time span:last-child {
        font-size: 28px;
        margin-top: 9px;
    }

    .setAlarm {
        flex-direction: row;
        justify-content: space-between;
    }

    .column select {
        width: 85%;
    }

    #stopAlarm {
        width: 100px;
        margin: 0 30%;
    }

    h3 {
        font-size: 20px;
    }

    .alarmLog {
        font-size: 28px;
    }
    .btn-delete{
        margin-left: 30px;
    }
}

                     /*WORLD CLOCK CSS*/


.contain {
    text-align: center;
    background: rgba(0, 0, 0, 0.8);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    width: 90%;
    max-width: 500px;
}

.contain h1{
    color: #ffffff;
}

h2 {
    margin-bottom: 20px;
    font-size: 2em;
    font-weight: bold;
}

select {
    padding: 10px;
    font-size: 1em;
    border-radius: 8px;
    border: 1px solid #ccc;
    margin-bottom: 20px;
    width: 100%;
    max-width: 300px;
}

.clock-display {
    background-color: #1d2b64;
    color: #ffffff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    font-size: 1.5em;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.clock-display:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

@media (max-width: 768px) {
    .contain {
        width: 100%;
        max-width: 400px;
        padding: 15px;
    }

    h2 {
        font-size: 1.5em;
    }

    .clock-display {
        font-size: 1.3em;
        padding: 15px;
    }

    select {
        max-width: 250px;
    }
}

@media (max-width: 480px) {
    .contain {
        width: 100%;
        max-width: 300px;
        padding: 10px;
    }

    h2 {
        font-size: 1.2em;
    }

    .clock-display {
        font-size: 1.1em;
        padding: 10px;
    }

    select {
        max-width: 200px;
    }
}


                    /*COUNTDOWN TIMER CSS*/


.countdown-container {
    text-align: center;
    background: rgba(0, 0, 0, 0.8);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
    max-width: 400px;
    width: 100%;
    box-sizing: border-box;
}

.countdown-container h1 {
    margin-bottom: 20px;
    font-size: 1.7em;
    color:white;
}

form {
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

label {
    font-size: 1em;
}

input[type="datetime-local"] {
    padding: 10px;
    font-size: 1em;
    border-radius: 5px;
    border: none;
    margin: 10px 0;
    width: 100%;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

button {
    padding: 10px 15px;
    font-size: 1em;
    border: none;
    border-radius: 5px;
    background-color: #1d2b64;
    color: #fff;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.3s;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

button:hover {
    background-color: #f8cdda;
    color: #333;
    transform: scale(1.05);
}

.countdown {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
}

.time1 {
    background: #333;
    color: #fff;
    padding: 15px;
    border-radius: 10px;
    min-width: 60px;
    transition: transform 0.3s;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    flex: 1 1 80px;
    box-sizing: border-box;
}

.time1 span {
    font-size: 0.9em;
    display: block;
}

.time1 p {
    margin: 5px 0 0;
    font-size: 1.0em;
    font-weight: bold;
}

.time1:hover {
    transform: scale(1.1);
}

@media (max-width: 480px) {
    .countdown-container {
        padding: 15px;
    }

    .countdown-container h1 {
        font-size: 1.2em;
    }

    input[type="datetime-local"] {
        padding: 8px;
        font-size: 0.9em;
    }

    button {
        padding: 8px 12px;
        font-size: 0.9em;
    }

    .time1 {
        padding: 10px;
    }

    .time1 span {
        font-size: 0.9em;
    }

    .time1 p {
        font-size: 0.9em;
    }
}