:root {
    --bg-main: #1b2e25;       
    --bg-darker: #0d1a14;      
    --accent-green: #9df1cb;   
    --text-main: #ffffff;
    --text-dim: #a8b8b0;
}

body {
    margin: 0;
    background-color: var(--bg-main);
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    color: var(--text-main);
    text-align: center;
    transition: background-color 0.4s ease, color 0.4s ease; 
}

#home-section {
    background-color: var(--bg-main);
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

#home-section h1 {
    font-size: 3rem;
    font-weight: 900;
    color: var(--accent-green);
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.top-nav {
    width: 100%;
    background-color: var(--bg-darker);
    padding: 15px 40px;
    display: flex;
    border-bottom: 2px solid var(--accent-green);
    box-sizing: border-box;
}

.nav-left {
    display: flex;
    gap: 30px;
    font-size: 11px;
    letter-spacing: 2px;
    font-weight: bold;
}

.nav-left span:hover {
    color: var(--accent-green);
}

.header-area {
    width: 100%;
    background-color: var(--bg-darker);
    color: white;
    padding: 8px 8px;
}

.activities-container {
    max-width: 1100px;
    margin: auto;
    padding: 50px 20px;
}

.activities {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.activity {
    background-color: var(--bg-darker);
    padding: 35px;
    border-radius: 4px;
    border: 1px solid rgba(0, 255, 136, 0.1);
    transition: transform 0.2s ease, border-color 0.3s ease;
}

.activity:hover {
    transform: translateY(-5px);
    border-color: var(--accent-green);
}

.activity h3 {
    font-size: 15px;
    margin-bottom: 10px;
}

button {
    padding: 12px 24px;
    border-radius: 4px;
    font-weight: bold;
    text-transform: uppercase;
    cursor: pointer;
    transition: 0.2s;
}

#home-section button, 
#lab-section button {
    background-color: var(--accent-green);
    color: #000000;
    border: none;
}

#home-section button:hover {
    background-color: #befcdf;
    transform: scale(1.05);
}

.activity button {
    background: transparent;
    border: 1px solid var(--accent-green);
    color: var(--accent-green);
}

.activity button:hover {
    background-color: var(--accent-green);
    color: #000000;
}

input {
    background: #0a1410;
    border: 1px solid #1b2e25;
    color: var(--accent-green);
    padding: 12px;
    margin: 10px 0;
    border-radius: 4px;
}

input:focus {
    border-color: var(--accent-green);
    outline: none;
}

.exercise4 {
    background: var(--bg-darker); 
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--accent-green); 
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), 
                inset 0 0 15px rgba(157, 241, 203, 0.05); 
    width: 90%;           /* expand width for horizontal layout */
    max-width: 700px;     /* limit max width */
    margin: 40px auto;
    display: flex;
    flex-direction: column;
    gap: 25px;
}

/* Section containers */
.quiz-section, .exam-section, .mco-section {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    align-items: center;
}

.quiz-section label, .exam-section label, .mco-section label {
    flex: 1 1 120px;  /* label takes space */
    min-width: 100px;
    text-transform: uppercase;
    font-size: 14px;
    color: var(--text-dim);
}

.quiz-section input, .exam-section input, .mco-section input {
    flex: 1 1 60px;  /* input next to label */
    min-width: 50px;
    padding: 10px;
    border-radius: 6px;
    border: 1px solid #1b2e25;
    background: rgba(0,0,0,0.3);
    color: var(--accent-green);
    transition: all 0.3s ease;
}

.quiz-section input:focus, .exam-section input:focus, .mco-section input:focus {
    border-color: var(--accent-green);
    box-shadow: 0 0 10px rgba(157, 241, 203, 0.2);
    outline: none;
}

/* Averages and result styling */
.quizAverage, .examDisplay, .mcoDisplay, .result {
    width: 100%;
    font-weight: bold;
    padding: 8px 10px;
    border-radius: 6px;
    background-color: rgba(0,0,0,0.2);
    color: var(--accent-green);
    margin-top: 5px;
}

.result {
    font-size: 1.2rem;
    color: var(--accent-green);
    border: 1px dashed var(--text-dim);
}

/* Reset button */
.resetBtn {
    background-color: transparent;
    border: 1px solid #ff5555; 
    color: #ff5555;
    padding: 12px;
    border-radius: 6px;
    cursor: pointer;
    margin-top: 15px;
}

.resetBtn:hover {
    background-color: #ff5555;
    color: white;
}