/* Basic reset and responsive styling */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: all .5s;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    font-family: Arial, sans-serif;
    background-color: #f3f4f6;
}

[id*="btn"] {
    color: #fff;
    font-size: 12px;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.container {
    text-align: center;
    width: 90%;
    max-width: 640px;
    /* Added */
    display: flex;
    flex-direction: column;
    align-items: center;
}

.big-header {
    font-size: 2rem;
    color: #00509e;
    font-weight: 100;
}

.subtitle {
    text-transform: uppercase;
    color: #555;
    font-weight: bold;
    margin-top: 5px;
}

#exam-selectors {
    margin: 50px 0;
}

#test-select {
    padding: 8px;
    /* font-size: 1rem; */
}

#start-exam-btn {
    background: #00a86b;
}

#start-exam-btn:hover {
    background: #008f5a;
}

.hidden, 
.hidden#exam-section, 
.hidden.popup {
    display: none;
}

/* Exam section */

#exam-section {
    /* display: flex;  --> injected by js */
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

.exam-iframe {
    width: 100%;
    height: 75vh;
    margin-top: 20px;
}

.timer-container {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 10px;
}

.timer-text {
    font-size: .8rem;
    text-transform: uppercase;
    color: #555;
}

#countdown-timer {
    text-align: left;
    font-size: 1.5rem;
    font-weight: bold;
    color: #ff6f61;
}

#end-exam-btn {
    background: #d9534f;
    display: flex;
    align-items: center;
}

#end-exam-btn:hover {
    background: #c9302c;
}

/* Popup confirmation */

.popup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.popup > p {
    font-size: 1.2rem;
    color: white;
    margin-bottom: 10px;
}

#confirm-end-btn {
    background: #d9302c;
}

#confirm-end-btn:hover {
    background: #c9302c;
}

#cancel-end-btn {
    background: #555;
}

#cancel-end-btn:hover {
    background: #444;
}