/**
 * KAICE Sidebar Base - 접는 사이드바 공통 뼈대
 * reader (.kaice-reader) 와 classroom 에서 공유하는 사이드바 패턴
 * 통일 클래스: .kaice-sidebar, .kaice-sidebar-header, etc.
 */

/* ==================== 사이드바 본체 ==================== */
.kaice-sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 300px;
    display: flex;
    flex-direction: column;
    background: #fff;
    border-right: 1px solid var(--theme-card-border, var(--theme-item-border));
    z-index: 20;
    transition: transform 0.25s ease, opacity 0.25s ease;
}

.admin-bar .kaice-sidebar {
    top: 32px;
}

@media (max-width: 782px) {
    .admin-bar .kaice-sidebar {
        top: 46px;
    }
}

.kaice-sidebar.collapsed {
    transform: translateX(-100%);
    opacity: 0;
    pointer-events: none;
}

/* 모바일: 기본 숨김, open 클래스로 표시 */
@media (max-width: 767px) {
    .kaice-sidebar {
        transform: translateX(-100%);
        z-index: 50;
    }

    .kaice-sidebar.open {
        transform: translateX(0);
    }

    .kaice-sidebar.collapsed {
        transform: translateX(-100%);
    }
}

/* ==================== 사이드바 헤더 ==================== */
.kaice-sidebar-header {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 16px;
    padding-bottom: 8px;
}

.kaice-sidebar-title-row {
    display: flex;
    align-items: flex-start;
}

.kaice-sidebar-title {
    flex: 1;
    margin: 0;
    font-size: 15px;
    font-weight: 600;
    color: var(--theme-text-color);
    line-height: 1.4;
    word-break: break-word;
}

/* ==================== 사이드바 메타 (뱃지 + 로고) ==================== */
.kaice-sidebar-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.kaice-sidebar-meta .badge {
    font-size: 11px;
    padding: 2px 6px;
}

.kaice-sidebar-logo {
    display: inline-flex;
    align-items: center;
}

.kaice-sidebar-logo img {
    height: 12px;
    width: auto;
}

/* ==================== 타이틀 콘텐츠 + 네비 링크 ==================== */
.sidebar-title-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-width: 0;
}

.sidebar-nav-links {
    display: flex;
    gap: 6px;
}

.nav-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    font-size: 12px;
    color: var(--theme-info-text);
    background: var(--theme-post-hover-bg);
    border-radius: var(--theme-button-radius);
    text-decoration: none;
    transition: background-color 0.15s, color 0.15s;
}

.nav-link-btn:hover {
    background-color: var(--theme-color-background);
    color: var(--theme-main-color);
}

.nav-link-btn i {
    font-size: 11px;
}

/* ==================== 드롭다운 ==================== */
.dropdown-wrapper {
    position: relative;
    padding: 0;
    background: transparent;
}

.dropdown-toggle {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    font-size: 12px;
    color: var(--theme-info-text);
    background: var(--theme-post-hover-bg);
    border: none;
    border-radius: var(--theme-button-radius);
    cursor: pointer;
    transition: background-color 0.15s, color 0.15s;
}

.dropdown-toggle:hover {
    background-color: var(--theme-color-background);
    color: var(--theme-main-color);
}

.dropdown-toggle .dropdown-arrow {
    font-size: 10px;
    margin-left: 2px;
    transition: transform 0.2s ease;
}

.dropdown-wrapper[aria-expanded="true"] .dropdown-toggle .dropdown-arrow {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    max-width: 280px;
    margin-top: 4px;
    padding: 4px 0;
    background: #fff;
    border: 1px solid var(--theme-card-border);
    border-radius: var(--theme-card-radius);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.15s ease, transform 0.15s ease, visibility 0.15s;
}

.dropdown-wrapper[aria-expanded="true"] .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 8px 12px;
    text-decoration: none;
    color: var(--theme-text-color);
    transition: background-color 0.15s ease;
}

.dropdown-item:hover {
    background-color: var(--theme-post-hover-bg);
}

.dropdown-item-title {
    font-size: 13px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.dropdown-item-period {
    font-size: 11px;
    color: var(--theme-info-text);
}

/* ==================== 스크롤 영역 ==================== */
.kaice-sidebar-scroll {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 0 16px 16px;
}

/* ==================== 사이드바 푸터 ==================== */
.kaice-sidebar-footer {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 12px 16px;
    border-top: 1px solid var(--theme-card-border, var(--theme-item-border));
}

/* ==================== 접기 토글 버튼 ==================== */
.kaice-collapse-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border: none;
    background: transparent;
    border-radius: var(--theme-button-radius);
    cursor: pointer;
    color: var(--theme-info-text);
    flex-shrink: 0;
    transition: background-color 0.15s;
}

.kaice-collapse-toggle:hover {
    background-color: var(--theme-post-hover-bg);
}

.kaice-collapse-toggle svg {
    width: 18px;
    height: 18px;
}

@media (max-width: 767px) {
    .kaice-collapse-toggle {
        display: none;
    }
}

/* ==================== 펼치기 버튼 (접혔을 때) ==================== */
.kaice-expand-toggle {
    display: none;
    position: fixed;
    left: 16px;
    top: 16px;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--theme-card-border, var(--theme-item-border));
    background: #fff;
    border-radius: var(--theme-card-radius, 8px);
    cursor: pointer;
    color: var(--theme-info-text);
    z-index: 15;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: background-color 0.15s;
}

.kaice-expand-toggle:hover {
    background-color: var(--theme-post-hover-bg);
}

.kaice-expand-toggle svg {
    width: 20px;
    height: 20px;
}

.kaice-expand-toggle.visible {
    display: inline-flex;
}

.admin-bar .kaice-expand-toggle {
    top: 48px;
}

@media (max-width: 782px) {
    .admin-bar .kaice-expand-toggle {
        top: 62px;
    }
}

@media (max-width: 767px) {
    .kaice-expand-toggle {
        display: none !important;
    }
}

/* ==================== 모바일 오버레이 ==================== */
.kaice-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 40;
}

.kaice-overlay.active {
    display: block;
}

/* ==================== 모바일 헤더 ==================== */
.kaice-mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    background: #fff;
    border-bottom: 1px solid var(--theme-card-border, var(--theme-item-border));
    z-index: 15;
    align-items: center;
    padding: 0 16px;
    gap: 12px;
}

.admin-bar .kaice-mobile-header {
    top: 46px;
}

@media (max-width: 767px) {
    .kaice-mobile-header {
        display: flex;
    }
}

.kaice-mobile-header .back-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 15px;
    font-weight: 600;
    color: var(--theme-text-color);
    text-decoration: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.kaice-mobile-header .back-link svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.kaice-mobile-header .spacer {
    flex: 1;
}

.kaice-mobile-header .mobile-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    border-radius: var(--theme-card-radius, 8px);
    cursor: pointer;
    color: var(--theme-info-text);
    flex-shrink: 0;
    transition: background-color 0.15s;
}

.kaice-mobile-header .mobile-toggle:hover {
    background-color: var(--theme-post-hover-bg);
}

/* ==================== 메인 레이아웃 ==================== */
.kaice-layout {
    padding-left: 300px;
    min-height: 100vh;
    transition: padding-left 0.25s ease;
}

body.kaice-classroom-page {
    padding-top: 35px;
    padding-bottom: 35px;
}

.kaice-layout.sidebar-collapsed {
    padding-left: 0;
}

@media (max-width: 767px) {
    .kaice-layout {
        padding-left: 0;
        padding-top: 30px;
    }

    .admin-bar .kaice-layout {
        padding-top: 30px;
    }
}

/* ==================== 회원 정보 (공통) ==================== */
.kaice-user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
}

.kaice-user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--theme-post-hover-bg, #f5f5f5);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--theme-info-text);
    font-size: 14px;
}

.kaice-user-detail {
    flex: 1;
    min-width: 0;
}

.kaice-user-name-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.kaice-user-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--theme-text-color);
    text-decoration: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.kaice-user-name:hover {
    color: var(--theme-main-color);
}

.kaice-user-role {
    font-size: 12px;
    color: var(--theme-info-text);
    flex-shrink: 0;
}

.kaice-home-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    color: var(--theme-info-text);
    text-decoration: none;
    flex-shrink: 0;
    margin-left: auto;
    transition: background 0.15s, color 0.15s;
}

.kaice-home-btn:hover {
    background: var(--theme-post-hover-bg, #f5f5f5);
    color: var(--theme-main-color);
}

.kaice-sidebar-footer-row {
    display: flex;
    align-items: center;
    width: 100%;
}