.panel-row {
    width: 90%;
    margin: 8px auto 0;

    display: flex;
    align-items: stretch;

    gap: 8px;
}

.panel-row .panel {
    width: auto;
    margin: 0;
}

.about-panel {
    flex: 2;
    border-color: #93c5fd;
    background-color: rgba(147, 197, 253, 0.12);
}

.about-panel h2 {
    color: #93c5fd;
}

.about-content {
    font-family: "Courier New", monospace;
    font-size: 13px;
    line-height: 1.5;
}

.about-content p {
    margin: 0 0 12px;
}

.about-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 7px;
    margin: 15px 0;
}

.about-list div {
    padding: 7px;

    border: 1px solid rgba(147, 197, 253, 0.5);
    border-radius: 6px;

    background-color: rgba(147, 197, 253, 0.08);
}

.about-list span {
    margin-right: 5px;
}

.about-status {
    padding-top: 8px;

    color: #fde68a;

    font-size: 11px;
}

.math-panel {
    border-color: #67e8f9;
    background-color: rgba(103, 232, 249, 0.12);
}

.math-panel h2 {
    color: #67e8f9;
}

.math-problem {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.math-problem img {
    display: block;

    max-width: 100%;
    max-height: 230px;

    object-fit: contain;

    border: 2px solid #67e8f9;
    border-radius: 6px;

    background: rgba(0, 0, 0, 0.2);

    box-sizing: border-box;
}

.math-hint {
    margin: 8px 0 0;

    text-align: center;

    font-family: "Courier New", monospace;
    font-size: 11px;

    color: rgba(255, 255, 255, 0.7);
}

.bottom-panels {
    align-items: stretch;
}

.bottom-panels .panel {
    margin: 0;
}

.visitor-board-panel {
    flex: 1.4;
}

.visitor-count-panel {
    flex: 0.7;
}

.achievements-panel {
    flex: 1;
}

/* ==============================
   VISITOR BOARD
   ============================== */

.visitor-board-panel {
    border-color: #f9a8d4;
    background-color: rgba(249, 168, 212, 0.12);
}

.visitor-board-panel h2 {
    color: #f9a8d4;
}

.visitor-messages {
    height: 150px;

    overflow-y: auto;

    margin-bottom: 10px;

    padding-right: 4px;
}

.visitor-message {
    margin-bottom: 7px;
    padding: 7px;

    border: 1px solid rgba(249, 168, 212, 0.4);
    border-radius: 5px;

    background: rgba(249, 168, 212, 0.06);

    font-family: "Courier New", monospace;
    font-size: 11px;
}

.visitor-message strong {
    color: #f9a8d4;
}

.visitor-message span {
    display: block;
    margin-top: 3px;
}

.visitor-form {
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
}

.visitor-form input {
    box-sizing: border-box;

    padding: 6px 8px;

    border: 1px solid #f9a8d4;
    border-radius: 5px;

    background: rgba(0, 0, 0, 0.25);

    color: white;

    font-family: "Courier New", monospace;
    font-size: 11px;

    outline: none;
}

#visitor-name {
    width: 90px;
}

#visitor-message {
    flex: 1;
    min-width: 100px;
}

.visitor-form input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.visitor-form button {
    padding: 6px 9px;

    border: 1px solid #f9a8d4;
    border-radius: 5px;

    background: rgba(249, 168, 212, 0.15);

    color: white;

    font-family: "Courier New", monospace;
    font-size: 11px;

    cursor: pointer;
}

.visitor-form button:hover {
    background: rgba(249, 168, 212, 0.3);
}

/* ==============================
   VISITOR COUNT
   ============================== */

.visitor-count-panel {
    border-color: #fde68a;
    background-color: rgba(253, 230, 138, 0.12);

    text-align: center;
}

.visitor-count-panel h2 {
    color: #fde68a;
}

.visitor-count {
    margin: 20px 0;

    padding: 12px;

    border: 2px solid #fde68a;

    background: rgba(0, 0, 0, 0.3);
}

#visitor-number {
    display: block;

    font-family: "Courier New", monospace;
    font-size: 30px;
    font-weight: bold;

    letter-spacing: 4px;

    color: #fde68a;

    text-shadow:
        0 0 8px rgba(253, 230, 138, 0.6);
}

.visitor-count p {
    margin: 8px 0 0;

    font-family: "Courier New", monospace;
    font-size: 10px;

    opacity: 0.7;
}

.visitor-counter-label {
    font-family: "Courier New", monospace;
    font-size: 9px;

    opacity: 0.7;
}

.visitor-counter-label strong {
    display: block;

    margin-top: 3px;

    color: #fde68a;

    font-size: 12px;
}

/* ==============================
   ACHIEVEMENTS
   ============================== */

.achievements-panel {
    border-color: #c4b5fd;
    background-color: rgba(196, 181, 253, 0.12);
}

.achievements-panel h2 {
    color: #c4b5fd;
}

#achievement-list {
    display: flex;
    flex-direction: column;

    gap: 7px;
}

.achievement {
    display: flex;
    align-items: center;

    gap: 9px;

    padding: 7px;

    border: 1px solid rgba(196, 181, 253, 0.4);
    border-radius: 5px;

    background: rgba(196, 181, 253, 0.06);

    font-family: "Courier New", monospace;
}

.achievement > span {
    font-size: 20px;
}

.achievement strong {
    font-size: 11px;
}

.achievement p {
    margin: 2px 0 0;

    font-size: 9px;

    opacity: 0.6;
}

.achievement.locked {
    opacity: 0.5;
}

.achievement-progress {
    margin: 10px 0 0;

    text-align: right;

    font-family: "Courier New", monospace;
    font-size: 10px;

    color: #c4b5fd;
}

.visitor-loading {
    margin: 20px 0;
    text-align: center;
    font-family: "Courier New", monospace;
    font-size: 11px;
    opacity: 0.6;
}