:root {
    --primary: #005fa3;
    --primary-dark: #005fa3;
    --bg: #121212;
    --surface: #1e1e1e;
    --text: #e0e0e0;
    --accent-green: #4caf50;
    --border: #333;
    --accent-red: #ff5555;
    --header-bg: #000000;
}

body {
    font-family: "Segoe UI", Arial, sans-serif;
    color: var(--text);
    margin: 0;
    padding: 0;
    text-align: center;
    background-image: url("bg.png");
    background-size: cover;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

    /* Header bar */
header {
    background-color: var(--surface);
    color: var(--primary);
    padding: 2vh 0;
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: bold;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
    margin-bottom: 2vh;
}

.input-row {
    margin-top: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    flex-direction: column
}

input[type="text"] {
    width: min(80vw, 300px);
    padding: 1.5vh 2vw;
    font-size: clamp(14px, 3vw, 16px);
    border: 1px solid var(--border);
    border-radius: 6px;
    background-color: var(--surface);
    color: var(--text);
}

input[type="text"]:focus {
    border-color: var(--primary-dark);
    outline: none;
}

button {
    padding: 1.5vh 4vw;
    background-color: var(--primary-dark);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: clamp(14px, 3vw, 16px);
    transition: background 0.2s ease-in-out;
}

button:hover {
    background-color: var(--primary-dark);
}

table {
    width: 95%;
    border-collapse: collapse;
    margin: 2vh auto;
    display: none;
    opacity: 0;
    transition: opacity 0.6s ease-in-out;
    font-size: clamp(12px, 2.5vw, 16px);
}

th, td {
    border: 1px solid var(--border);
    padding: clamp(0.5vh, 2vh, 24px) clamp(4px, 1vw, 12px);
    text-align: center;
    word-break: break-word;
    }

th {
    background-color: var(--primary-dark);
    color: white;
}

tr:nth-child(even) {
    background-color: #1c1c1c;
}

tr:nth-child(odd) {
    background-color: #1c1c1c;
}

.green {
    background-color: var(--accent-green);
    color: white;
}

.red {
    color: white;
}

#resultMessage {
    font-size: 18px;
    margin-top: 20px;
}

#playAgainBtn {
    margin-top: 20px;
    padding: 10px 20px;
    display: none;
}
@keyframes rowFadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        pacity: 1;
        transform: translateY(0);
    }
}

.new-row {
      animation: rowFadeIn 0.4s ease-out;
}

/* Mobile Optimization */
@media screen and (max-width: 768px) {
    .input-row {
        margin-top: 1vh;
        gap: 1vh;
    }

    #resultMessage {
        font-size: clamp(14px, 3vw, 18px);
        margin-top: 2vh;
        padding: 0 2vw;
    }

    #playAgainBtn {
        margin-top: 2vh;
        padding: 1.5vh 4vw;
    }

    colgroup {
        display: none;
    }

    table {
        table-layout: fixed;
    }

    th, td {
        width: 16.66%; /* Equal width for all 6 columns */
    }
}