.mailbox-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 0.8rem 1.5rem;
    border: 1px solid var(--line-color);
    background: transparent;
    border-radius: 8px;
    font-size: 1.1rem;
    color: var(--text-main);
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

.tab-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.tab-btn.active {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.mailbox-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.mail-item {
    background: var(--paper-color);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(180, 160, 140, 0.15);
    border: 1px solid var(--line-color);
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
}

.mail-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(180, 160, 140, 0.15);
}

.mail-meta {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    border-bottom: 1px dashed var(--line-color);
    padding-bottom: 0.5rem;
}

.mail-content {
    flex-grow: 1;
    overflow: hidden;
    position: relative;
    max-height: 150px;
}

.mail-preview {
    line-height: 1.8;
    color: var(--text-main);
    display: -webkit-box;
    -webkit-line-clamp: 5;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Image tab specific */
.mail-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 4px;
    margin-bottom: 1rem;
    border: 1px solid var(--line-color);
}

/* SHQS (Three Line Love Letter) specific */
.shqs-quote-box {
    text-align: center;
    font-family: 'Zhi Mang Xing', cursive;
    font-size: 1.5rem;
    line-height: 2;
    color: var(--accent-color);
    margin: 1rem 0;
}

/* Modal specific for mailbox */
#modalBody {
    line-height: 2;
    font-size: 1.1rem;
}

.modal-header {
    border-bottom: 2px dashed var(--line-color);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
    text-align: center;
    color: var(--text-muted);
}

.modal-full-content {
    white-space: pre-wrap;
    min-height: 200px;
}

.modal-full-image {
    max-width: 100%;
    border-radius: 4px;
    margin-bottom: 1rem;
    box-shadow: 0 4px 10px rgba(180, 160, 140, 0.15);
}