/* 학습자 헤더 쪽지 진입점 */
.header-msg-link { position: relative; display: inline-flex; align-items: center; color: #666 !important; font-size: 18px; text-decoration: none !important; }
.header-msg-link:hover { color: var(--brand-color) !important; }
.header-msg-badge { position: absolute; top: -6px; right: -10px; display: none; min-width: 16px; padding: 1px 5px; border-radius: 10px; background: #dc3545; color: #fff !important; font-size: 10px; line-height: 14px; text-align: center; }
.header-msg-pc { margin: 2px 14px 0 0; }
.header-msg-mobile { display: none !important; }

/* 학습자 B안: 내용 중심 피드 */
#learnerMessageModal .user-modal-dialog.xl { width: min(940px, calc(100vw - 32px)); max-width: 940px; max-height: min(760px, calc(100dvh - 32px)); }
#learnerMessageModal .user-modal-header { display: none; }
#learnerMessageModal .user-modal-body { padding: 0; overflow: hidden; }

.learner-mail { --mail-ink: #202a36; --mail-body: #435062; --mail-muted: #697584; --mail-line: #e1e5e9; --mail-soft: #f7f9fa; position: relative; min-height: 650px; padding: 0; overflow: hidden; background: #fff; color: var(--mail-body); font: 14px/1.45 Pretendard, system-ui, sans-serif; letter-spacing: -0.02em; }
.learner-mail *, .learner-mail *::before, .learner-mail *::after { box-sizing: border-box; }
.learner-mail [hidden] { display: none !important; }
.learner-mail button, .learner-mail input, .learner-mail select, .learner-mail textarea { font: inherit; letter-spacing: inherit; }
.learner-mail button { cursor: pointer; }
.learner-mail button:focus-visible, .learner-mail input:focus-visible, .learner-mail select:focus-visible, .learner-mail textarea:focus-visible { outline: 3px solid rgba(var(--brand-color-rgb), .2); outline-offset: 2px; }

.learner-mail-header { border-bottom: 1px solid var(--mail-line); }
.learner-mail-head-main { min-height: 60px; display: flex; align-items: center; gap: 8px; padding: 12px 16px; }
.learner-mail-heading { display: flex; align-items: center; gap: 8px; }
.learner-mail-heading h2 { margin: 0; color: var(--mail-ink); font-size: 20px; font-weight: 700; }
.learner-mail-unread { min-width: 24px; height: 24px; display: inline-flex; align-items: center; justify-content: center; padding: 0 7px; border-radius: 12px; background: var(--brand-color); color: #fff; font-size: 11px; font-weight: 700; }
.learner-mail-tabs { min-height: 44px; display: flex; align-items: flex-end; gap: 20px; padding: 0 16px; border-top: 1px solid var(--mail-line); }
.learner-mail-tab { min-height: 44px; padding: 0 2px; border: 0; border-bottom: 3px solid transparent; background: transparent; color: var(--mail-muted); font-size: 13px; }
.learner-mail-tab:hover, .learner-mail-tab.active { background: transparent; color: var(--brand-color); }
.learner-mail-tab.active { border-bottom-color: var(--brand-color); }
.learner-mail-tab.active { font-weight: 700; }

.learner-mail-primary, .learner-mail-secondary, .learner-mail-subtle, .learner-mail-danger, .learner-mail-back { min-height: 40px; display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 0 14px; border-radius: 8px; font-size: 13px; font-weight: 600; }
.learner-mail-primary { border: 1px solid var(--brand-color); background: var(--brand-color); color: #fff; }
.learner-mail-primary:hover { border-color: var(--brand-color-hover); background: var(--brand-color-hover); }
.learner-mail-secondary, .learner-mail-subtle { border: 1px solid #cfd5dc; background: #fff; color: #4c5968; }
.learner-mail-secondary:hover, .learner-mail-subtle:hover { border-color: #aab3bd; background: var(--mail-soft); }
.learner-mail-subtle { min-height: 32px; padding: 0 10px; font-size: 12px; }
.learner-mail-subtle.is-danger, .learner-mail-danger { border-color: #e4c3c6; color: #ad2831; }
.learner-mail-subtle.is-danger:hover, .learner-mail-danger:hover { background: #fff6f6; }
.learner-mail-primary:disabled, .learner-mail-secondary:disabled, .learner-mail-subtle:disabled, .learner-mail-danger:disabled { opacity: .42; cursor: not-allowed; }
.learner-mail-compose-button { min-height: 32px; padding: 0 10px; font-size: 12px; white-space: nowrap; }
.learner-mail-head-main > .learner-mail-close { margin-left: auto; }
.learner-mail-close { width: 36px; height: 36px; padding: 0; border: 0; background: transparent; color: #697584; font-size: 25px; line-height: 1; }
.learner-mail-close:hover { color: var(--mail-ink); }

.learner-mail-content { min-height: 546px; background: #fff; }
.learner-mail-toolbar { min-height: 52px; display: flex; align-items: center; gap: 8px; padding: 8px 16px; border-bottom: 1px solid var(--mail-line); }
.learner-mail-select-all { min-height: 42px; display: inline-flex; align-items: center; gap: 8px; color: #536171; font-size: 12px; white-space: nowrap; cursor: pointer; }
.learner-mail-select-all input, .learner-mail-row-check input { position: relative; width: 18px; height: 18px; min-width: 18px; margin: 0; border: 1.5px solid #b9c2cc; border-radius: 4px; appearance: none; -webkit-appearance: none; background: #fff; cursor: pointer; transition: border-color 160ms ease-out, background-color 160ms ease-out; }
.learner-mail-select-all input:hover, .learner-mail-row-check input:hover { border-color: var(--brand-color); }
.learner-mail-select-all input:checked, .learner-mail-row-check input:checked, .learner-mail-select-all input:indeterminate { border-color: var(--brand-color); background: var(--brand-color); }
.learner-mail-select-all input:checked::after, .learner-mail-row-check input:checked::after { position: absolute; top: 2px; left: 5px; width: 5px; height: 9px; border: solid #fff; border-width: 0 2px 2px 0; content: ''; transform: rotate(45deg); }
.learner-mail-select-all input:indeterminate::after { position: absolute; top: 7px; left: 4px; width: 8px; height: 2px; border-radius: 1px; background: #fff; content: ''; }
.learner-mail-select-all input:disabled, .learner-mail-row-check input:disabled { opacity: .45; cursor: default; }
.learner-mail-search { position: relative; width: min(430px, 48vw); display: flex; flex: 0 1 430px; }
.learner-mail-search i { position: absolute; top: 14px; left: 14px; color: #758191; font-size: 13px; }
.learner-mail-search input, .learner-mail-filter, .learner-mail-field input, .learner-mail-field select, .learner-mail-field textarea { border: 1px solid #cfd5dc; background: #fff; color: var(--mail-ink); }
.learner-mail-search input { width: 100%; min-height: 42px; padding: 0 14px 0 38px; border-radius: 8px; }
.learner-mail-search input::placeholder, .learner-mail-field input::placeholder, .learner-mail-field textarea::placeholder { color: #697584; opacity: 1; }
.learner-mail-filter { width: 156px; min-height: 42px; padding: 0 34px 0 12px; border-radius: 8px; }

.learner-mail-summary { min-height: 44px; display: flex; align-items: center; gap: 16px; padding: 8px 16px; border-bottom: 1px solid var(--mail-line); color: var(--mail-muted); font-size: 13px; }
.learner-mail-metrics { display: flex; align-items: center; gap: 16px; white-space: nowrap; }
.learner-mail-metrics strong { margin-left: 3px; color: var(--mail-ink); }
.learner-mail-default-actions, .learner-mail-bulk { display: flex; align-items: center; gap: 7px; margin-left: auto; }
.learner-mail-bulk strong { margin-right: 3px; color: var(--mail-ink); font-size: 12px; }

.learner-mail-list { max-height: 450px; overflow-y: auto; overscroll-behavior: contain; }
.learner-mail-row { position: relative; min-height: 96px; display: grid; grid-template-columns: 18px 40px minmax(0, 1fr) 10px; gap: 12px; align-items: start; padding: 12px 16px; border-bottom: 1px solid #e8ecef; background: #fff; cursor: pointer; transition: background-color 180ms ease-out; }
.learner-mail-row.is-sent { grid-template-columns: 18px 40px minmax(0, 1fr) 10px; }
.learner-mail-row:hover { background: #fafbfc; }
.learner-mail-row.is-unread { background: color-mix(in srgb, var(--brand-color-light) 35%, #fff); }
.learner-mail-row.is-unread:hover { background: color-mix(in srgb, var(--brand-color-light) 55%, #fff); }
.learner-mail-row.is-unread::before { position: absolute; top: 12px; bottom: 12px; left: 0; width: 3px; border-radius: 0 3px 3px 0; background: var(--brand-color); content: ''; }
.learner-mail-row-check { display: flex; align-self: stretch; align-items: center; justify-content: center; padding: 0; }
.learner-mail-avatar-stack { display: flex; align-self: center; align-items: center; flex-direction: column; gap: 4px; }
.learner-mail-avatar { position: relative; width: 38px; height: 38px; display: inline-flex; align-items: center; justify-content: center; border-radius: 50%; background: #edf0f3; color: #536171; font-size: 11px; font-weight: 700; }
.learner-mail-avatar-name { max-width: 48px; overflow: hidden; color: #536171; font-size: 10px; font-weight: 600; line-height: 1; text-align: center; text-overflow: ellipsis; white-space: nowrap; }
.learner-mail-row-copy { min-width: 0; align-self: center; }
.learner-mail-row-course { min-width: 0; display: flex; align-items: baseline; gap: 12px; margin-bottom: 4px; }
.learner-mail-row-course > time { margin-left: auto; color: var(--mail-muted); font-size: 12px; white-space: nowrap; }
.learner-mail-course-context { min-width: 0; display: flex; align-items: baseline; gap: 4px; overflow: hidden; color: #697584; font-size: 11px; white-space: nowrap; }
.learner-mail-course-context strong { overflow: hidden; color: #344151; font-weight: 600; text-overflow: ellipsis; }
.learner-mail-instructor-tag { display: inline-flex; flex: 0 0 auto; align-items: center; padding: 1px 5px; border-radius: 3px; background: var(--brand-color-light); color: var(--brand-color); font-size: 10px; font-weight: 600; }
.learner-mail-row-copy h3 { margin: 0 0 1px; overflow: hidden; color: #344151; font-size: 14px; font-weight: 600; line-height: 1.4; text-overflow: ellipsis; white-space: nowrap; }
.learner-mail-row.is-unread .learner-mail-row-copy h3 { color: var(--mail-ink); font-weight: 700; }
.learner-mail-row-copy p { margin: 0; overflow: hidden; color: #697584; font-size: 12px; line-height: 1.4; text-overflow: ellipsis; white-space: nowrap; }
.learner-mail-row-arrow { align-self: center; color: #9aa4af; font-size: 10px; }

.learner-mail-pagination { display: flex; justify-content: center; gap: 5px; padding: 14px; }
.learner-mail-pagination button { min-width: 32px; height: 32px; border: 1px solid var(--mail-line); border-radius: 6px; background: #fff; color: #596675; }
.learner-mail-pagination button.active { border-color: var(--brand-color); background: var(--brand-color); color: #fff; }
.learner-mail-pagination button:disabled { opacity: .35; cursor: default; }

.learner-mail-empty { min-height: 360px; display: flex; align-items: center; justify-content: center; flex-direction: column; padding: 36px; color: var(--mail-muted); text-align: center; }
.learner-mail-empty > span { width: 50px; height: 50px; display: inline-flex; align-items: center; justify-content: center; margin-bottom: 14px; border-radius: 50%; background: var(--mail-soft); color: #778493; font-size: 20px; }
.learner-mail-empty strong { color: var(--mail-ink); font-size: 15px; }
.learner-mail-empty p { margin: 6px 0 0; font-size: 13px; }
.learner-mail-skeleton > div { min-height: 96px; display: grid; grid-template-columns: 42px 1fr; gap: 12px; align-content: center; padding: 16px 18px; border-bottom: 1px solid #edf0f2; }
.learner-mail-skeleton span, .learner-mail-skeleton p { background: #edf0f3; animation: learner-mail-pulse 1.2s ease-in-out infinite alternate; }
.learner-mail-skeleton span { width: 42px; height: 42px; grid-row: 1 / span 2; border-radius: 50%; }
.learner-mail-skeleton p { width: 75%; height: 11px; margin: 0; border-radius: 4px; }
.learner-mail-skeleton p:last-child { width: 92%; }
@keyframes learner-mail-pulse { from { opacity: .5; } to { opacity: 1; } }

/* 목록 위에 열리는 상세 패널 */
.learner-mail-detail-panel { width: 440px; max-width: 100%; min-height: 100%; display: flex; background: #fff; box-shadow: -4px 0 8px rgba(23, 31, 41, .12); transform: translateX(18px); transition: transform 200ms ease-out; }
.learner-mail-detail-layer.is-open .learner-mail-detail-panel { transform: translateX(0); }
.learner-mail-detail { min-height: 650px; display: flex; flex: 1; flex-direction: column; }
.learner-mail-detail-header { padding: 16px 20px; border-bottom: 1px solid var(--mail-line); }
.learner-mail-detail-heading-row { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; margin-bottom: 16px; }
.learner-mail-detail-heading-row h2 { min-width: 0; margin: 0; color: var(--mail-ink); font-size: 18px; line-height: 1.45; }
.learner-mail-detail-heading-row time { flex: 0 0 auto; color: var(--mail-muted); font-size: 12px; white-space: nowrap; }
.learner-mail-detail-identity { display: flex; min-width: 0; align-items: center; gap: 12px; }
.learner-mail-detail-avatar { flex: 0 0 auto; width: 44px; height: 44px; background: var(--brand-color-light); color: var(--brand-color); }
.learner-mail-detail-identity-copy { min-width: 0; }
.learner-mail-detail-instructor { display: flex; align-items: center; gap: 8px; color: var(--mail-ink); font-size: 14px; font-weight: 600; }
.learner-mail-detail-course-context { min-width: 0; display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px; margin-top: 4px; color: #536171; font-size: 12px; }
.learner-mail-detail-course-context strong { color: #344151; font-weight: 600; }
.learner-mail-detail-body { min-height: 260px; flex: 1; padding: 22px 20px; color: #344151; line-height: 1.75; white-space: pre-wrap; overflow-wrap: anywhere; }
.learner-mail-detail-actions { display: flex; justify-content: space-between; gap: 10px; padding: 12px 18px; border-top: 1px solid var(--mail-line); background: var(--mail-soft); }
.learner-mail-danger { border: 1px solid #e4c3c6; background: #fff; color: #ad2831; }

/* 목록 위에 열리는 작성 패널 */
.learner-mail-compose-layer { position: absolute; inset: 0; z-index: 3; display: flex; opacity: 0; transition: opacity 180ms ease-out; }
.learner-mail-compose-layer.is-open { opacity: 1; }
.learner-mail-compose-backdrop { flex: 1; background: rgba(23, 31, 41, .28); }
.learner-mail-compose-panel { width: 440px; max-width: 100%; min-height: 100%; display: flex; background: #fff; box-shadow: -4px 0 8px rgba(23, 31, 41, .12); transform: translateX(18px); transition: transform 200ms ease-out; }
.learner-mail-compose-layer.is-open .learner-mail-compose-panel { transform: translateX(0); }
.learner-mail-compose-loading { margin-left: auto; width: 440px; padding: 28px; background: #fff; color: var(--mail-muted); }
.learner-mail-compose { min-height: 650px; display: flex; flex: 1; flex-direction: column; }
.learner-mail-compose-header { min-height: 64px; display: flex; align-items: center; justify-content: space-between; padding: 12px 18px; border-bottom: 1px solid var(--mail-line); }
.learner-mail-compose-header h2 { margin: 0; color: var(--mail-ink); font-size: 18px; }
.learner-mail-form-body { display: flex; flex: 1; flex-direction: column; gap: 16px; padding: 18px; overflow-y: auto; }
.learner-mail-field { display: flex; flex-direction: column; gap: 6px; }
.learner-mail-field label { color: #344151; font-size: 12px; font-weight: 700; }
.learner-mail-field label span { color: #b52630; }
.learner-mail-field input, .learner-mail-field select { width: 100%; min-height: 46px; padding: 0 12px; border-radius: 8px; }
.learner-mail-field textarea { width: 100%; min-height: 210px; padding: 12px; border-radius: 8px; line-height: 1.6; resize: vertical; }
.learner-mail-field small { align-self: flex-end; color: var(--mail-muted); font-size: 11px; line-height: 1.4; }
.learner-mail-field small b { color: #4c5968; font-size: 11px; line-height: inherit; font-weight: 500; }
.learner-mail-field-help { margin: 0; color: var(--mail-muted); font-size: 11px; }
.learner-mail-recipient-empty { min-height: 46px; display: flex; align-items: center; padding: 0 12px; border: 1px solid var(--mail-line); border-radius: 8px; background: var(--mail-soft); color: var(--mail-muted); }
.learner-mail-fixed-recipient { min-height: 58px; display: flex; align-items: center; gap: 10px; padding: 8px 10px; border: 1px solid var(--mail-line); border-radius: 8px; background: var(--mail-soft); }
.learner-mail-fixed-recipient div > strong, .learner-mail-fixed-recipient div > span { display: block; }
.learner-mail-fixed-recipient strong { color: var(--mail-ink); font-size: 13px; }
.learner-mail-fixed-recipient div > span { margin-top: 2px; color: var(--mail-muted); font-size: 11px; }
.learner-mail-compose-actions { display: flex; justify-content: flex-end; gap: 8px; padding: 12px 18px; border-top: 1px solid var(--mail-line); background: var(--mail-soft); }

@media (max-width: 991px) {
    .header-msg-pc { display: none !important; }
    .header-msg-mobile { display: inline-flex !important; align-items: center; font-size: 18px !important; }
    .header-msg-mobile i { font-size: 18px !important; }
    header .header-main .main-bar { display: flex !important; align-items: center; gap: 12px; }
}

@media (max-width: 768px) {
    #learnerMessageModal .user-modal-dialog.xl { width: calc(100% - 20px); max-width: none; height: min(720px, calc(100dvh - 20px)); max-height: calc(100dvh - 20px); min-height: 0; margin: 10px; border-radius: 12px; }
    #learnerMessageModal .user-modal-body { min-height: 0; display: flex; }
    #learnerMessageContainer { width: 100%; min-width: 0; flex: 1; }
    .learner-mail { width: 100%; height: 100%; min-height: 0; display: flex; flex-direction: column; }
    .learner-mail-header { flex: 0 0 auto; }
    .learner-mail-head-main { min-height: 44px; display: grid; grid-template-columns: minmax(0, 1fr) 32px; gap: 6px; padding: 8px 10px 4px; }
    .learner-mail-heading { grid-column: 1; }
    .learner-mail-heading h2 { font-size: 18px; }
    .learner-mail-unread { min-width: 20px; height: 20px; padding: 0 6px; border-radius: 10px; font-size: 10px; }
    .learner-mail-head-main > .learner-mail-close { width: 32px; height: 32px; grid-column: 2; grid-row: 1; }
    .learner-mail-tabs { min-height: 38px; width: 100%; gap: 16px; padding: 0 10px; }
    .learner-mail-tab { min-height: 38px; flex: 1; }
    .learner-mail-content { min-height: 0; flex: 1; overflow: hidden; }
    .learner-mail-list-view { height: 100%; min-height: 0; display: flex; flex-direction: column; }
    .learner-mail-toolbar { display: grid; grid-template-columns: minmax(0, 1fr); gap: 8px; padding: 8px 12px; }
    .learner-mail-filter { grid-column: 1; width: 100%; }
    .learner-mail-search { grid-column: 1 / -1; width: 100%; max-width: none; }
    .learner-mail-summary { display: grid; grid-template-columns: 18px minmax(0, 1fr) auto auto; gap: 8px; padding: 8px 12px; }
    .learner-mail-select-all { grid-column: 1; grid-row: 1; }
    .learner-mail-metrics { min-width: 0; grid-column: 2 / -1; grid-row: 1; gap: 10px; }
    .learner-mail-default-actions, .learner-mail-bulk { grid-column: 3; grid-row: 2; justify-content: flex-end; margin-left: 0; }
    .learner-mail-compose-button { grid-column: 4; grid-row: 2; align-self: center; }
    .learner-mail-list { min-height: 0; max-height: none; flex: 1; }
    .learner-mail-row { min-height: 96px; grid-template-columns: 18px 36px minmax(0, 1fr) 9px; gap: 8px; padding: 12px; }
    .learner-mail-row.is-sent { grid-template-columns: 18px 36px minmax(0, 1fr) 9px; }
    .learner-mail-avatar { width: 36px; height: 36px; }
    .learner-mail-row-copy p { display: block; white-space: nowrap; }
    .learner-mail-detail { height: 100%; min-height: 0; }
    .learner-mail-detail-body { min-height: 0; overflow-y: auto; overscroll-behavior: contain; }
    .learner-mail-compose-layer { position: absolute; }
    .learner-mail-compose-backdrop { display: none; }
    .learner-mail-compose-panel, .learner-mail-detail-panel, .learner-mail-compose-loading { width: 100%; height: 100%; min-height: 0; box-shadow: none; }
    .learner-mail-compose { height: 100%; min-height: 0; }
    .learner-mail-compose-header { min-height: 52px; padding: 8px 14px; }
    .learner-mail-form-body { min-height: 0; padding: 16px 14px; overscroll-behavior: contain; }
    .learner-mail-field textarea { min-height: 240px; }
}

@media (prefers-reduced-motion: reduce) {
    .learner-mail *, .learner-mail *::before, .learner-mail *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}