.section-switch {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
    margin: 0 20px 12px;
    padding: 4px;
    border-radius: 12px;
    background: rgba(21, 76, 61, .07);
}

.section-tab {
    padding: 9px 7px;
    border-radius: 9px;
    background: transparent;
    color: var(--muted);
    font-size: 11px;
    font-weight: 800;
}

.section-tab.active {
    background: var(--white);
    color: var(--green);
    box-shadow: 0 3px 10px rgba(23, 33, 29, .07);
}

.knowledge-view {
    height: 100%;
    overflow: auto;
    background: #f8faf8;
}

.knowledge-list-view {
    width: min(1180px, calc(100% - 64px));
    margin: 0 auto;
    padding: 54px 0 70px;
}

.knowledge-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 30px;
}

.knowledge-header h2 {
    margin: 0;
    font: 48px/1.02 Georgia, serif;
    letter-spacing: -.045em;
}

.knowledge-header > div > p:last-child {
    max-width: 570px;
    margin: 18px 0 0;
    color: var(--muted);
    line-height: 1.6;
}

.outlook-mark {
    width: 64px;
    height: 64px;
    display: grid;
    place-items: center;
    border-radius: 18px;
    background: #106ebe;
    color: #fff;
    font-size: 28px;
    font-weight: 900;
    box-shadow: 0 14px 34px rgba(16, 110, 190, .22);
}

.knowledge-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin: 38px 0;
}

.knowledge-stat {
    padding: 18px 20px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--white);
}

.knowledge-stat strong {
    display: block;
    font: 30px Georgia, serif;
}

.knowledge-stat span {
    display: block;
    margin-top: 5px;
    color: var(--muted);
    font-size: 11px;
    font-weight: 700;
}

.knowledge-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.knowledge-toolbar div {
    display: grid;
    gap: 4px;
}

.knowledge-toolbar small {
    color: var(--muted);
}

.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

.knowledge-card {
    min-height: 275px;
    display: flex;
    flex-direction: column;
    padding: 22px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: var(--white);
    text-align: left;
    transition: transform .2s, box-shadow .2s, border-color .2s;
}

.knowledge-card:hover {
    transform: translateY(-3px);
    border-color: #a9c3b9;
    box-shadow: 0 18px 40px rgba(23, 33, 29, .09);
}

.knowledge-card-top,
.knowledge-card-foot,
.knowledge-tags {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 7px;
}

.knowledge-number {
    color: #106ebe;
    font-size: 10px;
    font-weight: 900;
    letter-spacing: .1em;
}

.knowledge-tag {
    padding: 5px 8px;
    border-radius: 999px;
    background: var(--soft);
    color: var(--green);
    font-size: 9px;
    font-weight: 800;
}

.knowledge-card h3 {
    margin: 18px 0 10px;
    font-size: 17px;
    line-height: 1.3;
}

.knowledge-card p {
    display: -webkit-box;
    overflow: hidden;
    margin: 0 0 20px;
    color: var(--muted);
    font-size: 12px;
    line-height: 1.55;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
}

.knowledge-card-foot {
    justify-content: space-between;
    margin-top: auto;
    padding-top: 14px;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: 10px;
}

.knowledge-more {
    display: block;
    margin: 24px auto 0;
    padding: 12px 18px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--white);
    color: var(--green);
    font-weight: 800;
}

.knowledge-empty {
    grid-column: 1 / -1;
    padding: 60px 24px;
    border: 1px dashed #cbd5d0;
    border-radius: 18px;
    text-align: center;
    color: var(--muted);
}

.knowledge-detail {
    width: min(900px, calc(100% - 64px));
    min-height: 100%;
    margin: 0 auto;
    padding: 42px 0 80px;
}

.back-button {
    margin-bottom: 34px;
    padding: 0;
    background: transparent;
    color: var(--green);
    font-size: 12px;
    font-weight: 800;
}

.knowledge-detail-header h2 {
    max-width: 760px;
    margin: 0 0 16px;
    font: 38px/1.12 Georgia, serif;
}

.knowledge-summary {
    margin: 28px 0 34px;
    padding: 22px 24px;
    border-left: 4px solid #106ebe;
    border-radius: 0 14px 14px 0;
    background: #eaf4fd;
    color: #29465d;
    line-height: 1.6;
}

.knowledge-messages {
    display: grid;
    gap: 14px;
}

.knowledge-message {
    padding: 20px 22px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--white);
}

.knowledge-message-head {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 10px;
    font-size: 11px;
}

.knowledge-message-head time {
    color: var(--muted);
}

.knowledge-message p {
    margin: 0;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    font-size: 14px;
    line-height: 1.65;
}

.approval-panel {
    display: grid;
    gap: 10px;
    width: min(620px, 70vw);
    margin-top: 10px;
    padding: 14px;
    border: 1px solid #b9d1c7;
    border-radius: 14px;
    background: #f4f9f7;
}

.approval-panel > strong {
    color: var(--green);
    font-size: 11px;
}

.approval-panel textarea {
    width: 100%;
    resize: vertical;
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 11px;
    background: var(--white);
    line-height: 1.5;
}

.approval-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.approval-actions button {
    padding: 9px 12px;
    border-radius: 9px;
    font-size: 11px;
    font-weight: 800;
}

.approval-reject { background: #f2e8e8; color: #8b3232; }
.approval-approve { background: var(--green); color: #fff; }
.approval-actions button:disabled { opacity: .5; }

@media (max-width: 1050px) {
    .knowledge-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 850px) {
    .section-switch { grid-template-columns: 1fr; margin: 0 8px 12px; }
    .section-tab { overflow: hidden; padding: 8px 3px; font-size: 9px; }
    .knowledge-list-view,
    .knowledge-detail { width: min(100% - 36px, 900px); }
    .knowledge-header h2 { font-size: 38px; }
}

@media (max-width: 650px) {
    .knowledge-grid,
    .knowledge-stats { grid-template-columns: 1fr; }
    .outlook-mark { display: none; }
    .knowledge-list-view { padding-top: 32px; }
    .knowledge-detail-header h2 { font-size: 30px; }
}

/* Keep every viewport-height panel scrollable, including on shorter screens. */
html,
body {
    height: 100%;
    overflow-y: auto;
}

.app-shell {
    height: 100vh;
    height: 100dvh;
    min-height: 0;
    overflow-x: hidden;
    overflow-y: auto;
}

.sidebar,
.conversation,
.thread,
.knowledge-view,
.ticket-list,
.messages {
    min-height: 0;
}

.sidebar,
.conversation {
    height: 100%;
    overflow: hidden;
}

.ticket-list,
.messages,
.knowledge-view {
    overflow-y: scroll;
    overscroll-behavior: contain;
    scrollbar-gutter: stable;
    scrollbar-color: #9eb2aa transparent;
    scrollbar-width: auto;
}

.ticket-list::-webkit-scrollbar,
.messages::-webkit-scrollbar,
.knowledge-view::-webkit-scrollbar,
body::-webkit-scrollbar {
    width: 11px;
}

.ticket-list::-webkit-scrollbar-track,
.messages::-webkit-scrollbar-track,
.knowledge-view::-webkit-scrollbar-track,
body::-webkit-scrollbar-track {
    background: transparent;
}

.ticket-list::-webkit-scrollbar-thumb,
.messages::-webkit-scrollbar-thumb,
.knowledge-view::-webkit-scrollbar-thumb,
body::-webkit-scrollbar-thumb {
    border: 3px solid transparent;
    border-radius: 999px;
    background: #9eb2aa;
    background-clip: padding-box;
}

.ticket-list::-webkit-scrollbar-thumb:hover,
.messages::-webkit-scrollbar-thumb:hover,
.knowledge-view::-webkit-scrollbar-thumb:hover,
body::-webkit-scrollbar-thumb:hover {
    background: #6f8980;
    background-clip: padding-box;
}