.mailbox-link {
    position: relative;
    padding-left: 0.75rem;
    padding-right: 0.75rem;
}

.mailbox-link .bi-envelope-paper {
    font-size: 1.1rem;
}

.mailbox-badge {
    background: #ea580c;
    box-shadow: 0 0 0 2px var(--primary-color);
}

.mailbox-dropdown {
    width: min(390px, calc(100vw - 1.25rem));
}

.mailbox-item__meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.2rem;
    color: #64748b;
    font-size: 0.78rem;
}

.mailbox-pill {
    display: inline-flex;
    align-items: center;
    padding: 0.14rem 0.45rem;
    border-radius: 999px;
    background: rgba(249, 115, 22, 0.12);
    color: #c2410c;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.01em;
}

.mailbox-shell {
    display: grid;
    grid-template-columns: 280px minmax(0, 1fr);
    gap: 1.5rem;
    align-items: start;
}

.mailbox-sidebar-card,
.mailbox-main-card,
.mailbox-compose-card,
.mailbox-detail-card {
    border: 1px solid rgba(148, 163, 184, 0.16);
    border-radius: 1.2rem;
    background: #ffffff;
    box-shadow: 0 20px 45px rgba(15, 23, 42, 0.08);
}

.mailbox-sidebar-card {
    overflow: hidden;
}

.mailbox-brand {
    padding: 1.2rem 1.2rem 1rem;
    background: #1d4ed8;
    color: #fff;
}

.mailbox-brand h2 {
    margin: 0;
    font-size: 1.35rem;
    font-weight: 700;
}

.mailbox-brand p {
    margin: 0.45rem 0 0;
    color: rgba(255, 255, 255, 0.75);
    font-size: 0.9rem;
    line-height: 1.5;
}

.mailbox-nav {
    padding: 0.95rem;
}

.mailbox-nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.8rem;
    padding: 0.85rem 0.95rem;
    border-radius: 0.95rem;
    color: #0f172a;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.18s ease, background-color 0.18s ease, color 0.18s ease;
}

.mailbox-nav-link:hover,
.mailbox-nav-link:focus {
    transform: translateY(-1px);
    background: rgba(15, 23, 42, 0.04);
    color: #0f172a;
}

.mailbox-nav-link.is-active {
    background: #dbeafe;
    color: #0f172a;
    border: 1px solid #bfdbfe;
}

.mailbox-nav-meta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.85rem;
    height: 1.85rem;
    padding: 0 0.45rem;
    border-radius: 999px;
    background: #eff6ff;
    color: #1d4ed8;
    font-size: 0.78rem;
    font-weight: 700;
}

.mailbox-main-card,
.mailbox-compose-card,
.mailbox-detail-card {
    overflow: hidden;
}

.mailbox-hero {
    padding: 1.4rem 1.5rem 1.1rem;
    background: #f8fafc;
    border-bottom: 1px solid rgba(148, 163, 184, 0.16);
}

.mailbox-hero__eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    margin-bottom: 0.55rem;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: #0369a1;
    text-transform: uppercase;
}

.mailbox-hero h1 {
    margin: 0;
    font-size: clamp(1.65rem, 3vw, 2.35rem);
    font-weight: 750;
    color: #0f172a;
}

.mailbox-hero p {
    margin: 0.55rem 0 0;
    max-width: 58ch;
    color: #64748b;
    font-size: 0.98rem;
    line-height: 1.65;
}

.mailbox-reply-preview {
    margin-top: 0.9rem;
    padding: 0.85rem 0.95rem;
    border-radius: 0.95rem;
    background: #e0f2fe;
    border: 1px solid rgba(14, 116, 144, 0.12);
}

.mailbox-reply-preview__title {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    color: #0f172a;
    font-size: 0.88rem;
    font-weight: 700;
}

.mailbox-reply-thread {
    display: grid;
    gap: 0.55rem;
}

.mailbox-reply-thread__item {
    display: grid;
    grid-template-columns: 30px minmax(0, 1fr);
    column-gap: 0.55rem;
    align-items: start;
    max-width: min(80%, 700px);
    padding: 0.65rem 0.8rem;
    border-radius: 0.95rem 0.95rem 0.95rem 0.4rem;
    background: rgba(255, 255, 255, 0.88);
    border: 1px solid rgba(148, 163, 184, 0.14);
}

.mailbox-reply-thread__item.is-own {
    margin-left: auto;
    border-radius: 0.95rem 0.95rem 0.4rem 0.95rem;
    background: #dbeafe;
}

.mailbox-reply-thread__meta {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    flex-wrap: wrap;
    margin-bottom: 0.3rem;
    color: #475569;
    font-size: 0.78rem;
}

.mailbox-reply-thread__body {
    grid-column: 2;
    color: #334155;
    white-space: pre-wrap;
    line-height: 1.45;
    font-size: 0.92rem;
}

.mailbox-reply-context {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.9rem;
    padding: 0.65rem 0.85rem;
}

.mailbox-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.85rem;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid rgba(148, 163, 184, 0.12);
}

.mailbox-toolbar__actions {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    flex-wrap: wrap;
}

.mailbox-soft-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.65rem 0.9rem;
    border-radius: 0.9rem;
    border: 1px solid rgba(148, 163, 184, 0.24);
    background: #fff;
    color: #0f172a;
    text-decoration: none;
    font-weight: 600;
}

.mailbox-soft-btn:hover,
.mailbox-soft-btn:focus {
    color: #0f172a;
    background: #f8fafc;
}

.mailbox-primary-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1rem;
    border: 0;
    border-radius: 0.95rem;
    background: #1d4ed8;
    color: #fff;
    font-weight: 700;
}

.mailbox-primary-btn:hover,
.mailbox-primary-btn:focus {
    color: #fff;
    opacity: 0.96;
}

.mailbox-list {
    padding: 0.9rem;
}

.mailbox-row {
    display: grid;
    grid-template-columns: 34px minmax(0, 1fr);
    column-gap: 0.85rem;
    align-items: start;
    padding: 1rem 1.05rem;
    margin-bottom: 0.8rem;
    border-radius: 1rem;
    border: 1px solid rgba(148, 163, 184, 0.18);
    background: #ffffff;
    color: inherit;
    text-decoration: none;
    transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.mailbox-row:hover,
.mailbox-row:focus {
    transform: translateY(-2px);
    box-shadow: 0 14px 28px rgba(15, 23, 42, 0.08);
    border-color: rgba(59, 130, 246, 0.26);
    color: inherit;
}

.mailbox-row.is-unread {
    border-left: 5px solid #2563eb;
    background: #eff6ff;
}

.mailbox-row__top,
.mailbox-row__meta,
.mailbox-row__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.9rem;
    flex-wrap: wrap;
}

.mailbox-row__subject {
    font-size: 1.02rem;
    font-weight: 700;
    color: #0f172a;
}

.mailbox-row__content {
    min-width: 0;
}

.mailbox-row > :not(.mailbox-row__avatar):not(.mailbox-row__content) {
    grid-column: 2;
    min-width: 0;
}

.mailbox-row__body {
    margin-top: 0.6rem;
    color: #64748b;
    line-height: 1.55;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.mailbox-row__meta {
    margin-top: 0.55rem;
    font-size: 0.82rem;
    color: #64748b;
}

.mailbox-row__time {
    font-size: 0.8rem;
    color: #94a3b8;
}

.mailbox-empty {
    padding: 3rem 1.2rem;
    text-align: center;
    color: #64748b;
}

.mailbox-empty i {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 4.2rem;
    height: 4.2rem;
    margin-bottom: 1rem;
    border-radius: 999px;
    background: rgba(59, 130, 246, 0.08);
    color: #2563eb;
    font-size: 1.6rem;
}

.mailbox-compose-card form,
.mailbox-detail-card__section {
    padding: 1.4rem 1.5rem 1.5rem;
}

.mailbox-form-grid {
    display: grid;
    gap: 1rem;
}

.mailbox-form-card {
    padding: 1rem;
    border-radius: 1rem;
    background: #f8fafc;
    border: 1px solid rgba(148, 163, 184, 0.16);
}

.mailbox-form-card h3 {
    margin: 0 0 0.7rem;
    font-size: 1rem;
    font-weight: 700;
    color: #0f172a;
}

.mailbox-recipient-scope ul {
    display: grid;
    gap: 0.7rem;
    padding-left: 0;
    margin: 0;
    list-style: none;
}

.mailbox-recipient-scope li label {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    padding: 0.8rem 0.95rem;
    border-radius: 0.9rem;
    background: #fff;
    border: 1px solid rgba(148, 163, 184, 0.18);
    cursor: pointer;
    font-weight: 600;
}

.mailbox-recipient-list {
    display: block;
    max-height: 168px;
    overflow-y: auto;
    padding: 0.15rem 0;
    margin: 0;
    list-style: none;
    border: 1px solid rgba(148, 163, 184, 0.18);
    border-radius: 0.8rem;
    background: #ffffff;
}

.mailbox-recipient-list li {
    margin: 0;
    border-bottom: 1px solid rgba(148, 163, 184, 0.12);
}

.mailbox-recipient-list li:last-child {
    border-bottom: 0;
}

.mailbox-recipient-list label {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.55rem 0.75rem;
    border-radius: 0;
    background: transparent;
    border: 0;
    cursor: pointer;
    color: #0f172a;
    font-weight: 500;
    font-size: 0.92rem;
    transition: background-color 0.18s ease;
}

.mailbox-recipient-list label:hover,
.mailbox-recipient-list label:focus-within {
    background: #f8fafc;
}

.mailbox-recipient-list input[type="checkbox"] {
    width: 0.95rem;
    height: 0.95rem;
    margin: 0;
    accent-color: #1d4ed8;
    flex: 0 0 auto;
}

.mailbox-recipient-search {
    position: relative;
    margin-bottom: 0.6rem;
}

.mailbox-recipient-search .bi-search {
    position: absolute;
    top: 50%;
    left: 0.7rem;
    transform: translateY(-50%);
    color: #94a3b8;
    font-size: 0.82rem;
    pointer-events: none;
}

.mailbox-recipient-search .form-control {
    padding-left: 2rem;
    border-radius: 0.75rem;
}

.mailbox-detail-card__header {
    padding: 1.4rem 1.5rem 1rem;
    border-bottom: 1px solid rgba(148, 163, 184, 0.12);
}

.mailbox-detail-card__subject {
    font-size: clamp(1.4rem, 2.2vw, 2rem);
    font-weight: 750;
    color: #0f172a;
}

.mailbox-detail-card__intro {
    display: flex;
    align-items: flex-start;
    gap: 0.9rem;
}

.mailbox-detail-card__avatar-wrap {
    flex: 0 0 auto;
    padding-top: 0.15rem;
}

.mailbox-detail-card__meta {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    flex-wrap: wrap;
    margin-top: 0.8rem;
    color: #64748b;
}

.mailbox-detail-card__body {
    white-space: pre-wrap;
    line-height: 1.8;
    color: #334155;
    background: #f8fafc;
    border: 1px solid rgba(148, 163, 184, 0.14);
    border-radius: 1rem;
    padding: 1rem 1.05rem;
}

.mailbox-thread {
    display: grid;
    gap: 0.75rem;
    align-items: start;
}

.mailbox-thread-item {
    display: grid;
    grid-template-columns: 34px minmax(0, 1fr);
    column-gap: 0.65rem;
    align-items: start;
    width: fit-content;
    max-width: min(78%, 760px);
    padding: 0.75rem 0.9rem;
    border: 1px solid rgba(148, 163, 184, 0.16);
    border-radius: 1rem 1rem 1rem 0.4rem;
    background: #f8fafc;
}

.mailbox-thread-item.is-own {
    margin-left: auto;
    background: #eff6ff;
    border-color: rgba(59, 130, 246, 0.2);
    border-radius: 1rem 1rem 0.4rem 1rem;
}

.mailbox-thread-item.is-current {
    box-shadow: inset 0 0 0 1px #1d4ed8;
}

.mailbox-thread-item__meta {
    grid-column: 2;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 0.35rem;
    color: #64748b;
    font-size: 0.8rem;
}

.mailbox-thread-item__sender {
    color: #0f172a;
    font-weight: 700;
}

.mailbox-thread-item__body {
    grid-column: 2;
    white-space: pre-wrap;
    color: #334155;
    line-height: 1.55;
}

.mailbox-thread-avatar {
    width: 34px;
    height: 34px;
    border-radius: 999px;
    object-fit: cover;
    background: #e2e8f0;
    border: 1px solid rgba(148, 163, 184, 0.22);
}

.mailbox-thread-avatar--sm {
    width: 30px;
    height: 30px;
}

.mailbox-thread-avatar--lg {
    width: 42px;
    height: 42px;
}

.mailbox-thread-avatar--fallback {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #64748b;
}

.mailbox-delivery-list {
    display: grid;
    gap: 0.7rem;
    margin-top: 1rem;
}

.mailbox-delivery-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.5rem 0.7rem;
    border-radius: 999px;
    background: #f8fafc;
    border: 1px solid rgba(148, 163, 184, 0.16);
    color: #334155;
    font-size: 0.82rem;
}

.mailbox-error {
    margin-top: 0.35rem;
    color: #b91c1c;
    font-size: 0.82rem;
}

@media (max-width: 991.98px) {
    .mailbox-shell {
        grid-template-columns: 1fr;
    }

    .mailbox-sidebar-card {
        position: static;
    }

    .mailbox-thread-item {
        max-width: 100%;
    }

    .mailbox-reply-thread__item {
        max-width: 100%;
    }
}