/* ========================================
   管理后台 / 学生终端 — 简约白 · 柔和
   ======================================== */

.admin-body { display: flex; min-height: 100vh; background: var(--bg); }

/* --- 侧边栏 --- */
.sidebar {
    width: 232px;
    background: rgba(255,255,255,.82);
    backdrop-filter: blur(20px) saturate(160%);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
    border-right: 1px solid rgba(0,0,0,.05);
    display: flex; flex-direction: column;
    position: fixed; top: 0; left: 0; bottom: 0; z-index: 50;
}
.sidebar-brand {
    padding: var(--sp-3) var(--sp-3) var(--sp-2);
    border-bottom: 1px solid var(--line);
}
.sidebar-brand a {
    display: flex; align-items: center; gap: 10px;
    font-size: 15px; font-weight: 400; letter-spacing: .04em; color: var(--text);
}
.sidebar-brand a:hover { color: var(--text); }
.sidebar-brand img { height: 28px; width: 28px; object-fit: contain; }

.sidebar-nav { flex: 1; padding: var(--sp-2) 0; overflow-y: auto; }
.sidebar-nav .nav-item {
    position: relative;
    display: flex; align-items: center; gap: 10px;
    padding: 11px var(--sp-3);
    font-size: 14px; color: var(--text-mid);
    transition: all var(--dur) var(--ease);
}
.sidebar-nav .nav-item::before {
    content: '';
    position: absolute; left: 0; top: 50%; transform: translateY(-50%);
    width: 3px; height: 0; border-radius: 0 2px 2px 0;
    background: linear-gradient(180deg, var(--pink-hover), var(--lilac-deep));
    transition: height var(--dur) var(--ease);
}
.sidebar-nav .nav-item:hover {
    color: var(--text);
    background: linear-gradient(90deg, rgba(255,240,240,.7), transparent);
}
.sidebar-nav .nav-item:hover::before { height: 16px; }
.sidebar-nav .nav-item.active {
    color: var(--text); font-weight: 500;
    background: linear-gradient(90deg, var(--pink-tint), rgba(255,240,240,.25));
}
.sidebar-nav .nav-item.active::before { height: 22px; }

.sidebar-footer {
    padding: var(--sp-2) var(--sp-3);
    border-top: 1px solid var(--line);
    display: flex; justify-content: space-between; align-items: center;
    font-size: 13px; color: var(--text-soft);
}
.sidebar-footer a { color: var(--danger); font-size: 12px; }

/* --- 主区 --- */
.admin-main { margin-left: 232px; flex: 1; min-height: 100vh; position: relative; z-index: 2; }
.admin-header {
    padding: var(--sp-2) var(--sp-4);
    background: rgba(255,255,255,.72);
    backdrop-filter: blur(20px) saturate(160%);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
    border-bottom: 1px solid rgba(0,0,0,.045);
    position: sticky; top: 0; z-index: 10;
}
.header-inner { display: flex; justify-content: space-between; align-items: center; gap: var(--sp-2); }
.breadcrumb { font-size: 12px; color: var(--text-soft); margin-bottom: 2px; }
.breadcrumb a { color: var(--pink-hover); }
.breadcrumb .sep { margin: 0 6px; }
.page-title { font-size: 19px; font-weight: 400; letter-spacing: .02em; }
.admin-content { padding: var(--sp-4); }

/* --- Tab --- */
.tab-bar {
    display: flex;
    border-bottom: 1px solid var(--line);
    background: rgba(250,250,250,.6);
    border-radius: var(--r-xl) var(--r-xl) 0 0;
    overflow: hidden;
}
.tab-btn {
    padding: 14px 26px; background: transparent; border: none;
    font-family: var(--font); font-size: 13px; color: var(--text-soft);
    cursor: pointer; transition: all var(--dur) var(--ease);
    border-bottom: 2px solid transparent;
}
.tab-btn:hover { color: var(--text); background: rgba(255,255,255,.5); }
.tab-btn.active {
    color: var(--text); font-weight: 500;
    background: rgba(255,255,255,.9);
    border-bottom-color: var(--pink-hover);
}

/* --- 数据表格（后台增强） --- */
.data-table { width: 100%; border-collapse: separate; border-spacing: 0; font-size: 13px; }
.data-table thead th {
    text-align: left; padding: 12px 14px; font-weight: 500; font-size: 12px;
    color: var(--text-mid); letter-spacing: .04em;
    background: rgba(250,250,250,.8);
    border-bottom: 1px solid var(--line-strong);
    white-space: nowrap;
}
.data-table thead th:first-child { border-radius: var(--r-sm) 0 0 0; }
.data-table thead th:last-child  { border-radius: 0 var(--r-sm) 0 0; }
.data-table tbody td { padding: 12px 14px; border-bottom: 1px solid var(--line); color: var(--text); }
.data-table tbody tr { transition: background var(--dur) var(--ease); }
.data-table tbody tr:hover td { background: var(--pink-tint); }
.data-table tbody tr:last-child td { border-bottom: none; }

/* 表格外壳（毛玻璃） */
.table-wrap {
    background: rgba(255,255,255,.72);
    backdrop-filter: blur(18px) saturate(150%);
    -webkit-backdrop-filter: blur(18px) saturate(150%);
    border: 1px solid rgba(255,255,255,.85);
    border-radius: var(--r-xl);
    box-shadow: var(--shadow);
    overflow-x: auto;
}

.actions { display: flex; gap: 6px; flex-wrap: wrap; }

/* --- 工具条 --- */
.toolbar {
    display: flex; align-items: center; justify-content: space-between;
    gap: var(--sp-2); margin-bottom: var(--sp-3); flex-wrap: wrap;
}
.toolbar-group { display: flex; gap: var(--sp-1); flex-wrap: wrap; align-items: center; }

/* --- 模态 --- */
.modal-overlay {
    display: none; position: fixed; inset: 0;
    background: rgba(0,0,0,.18); backdrop-filter: blur(6px);
    z-index: 1000; align-items: center; justify-content: center;
}
.modal-overlay.active { display: flex; }
.modal-box {
    background: var(--surface); border-radius: var(--r-xl);
    padding: var(--sp-4); width: 420px; max-width: 90vw;
    box-shadow: 0 20px 60px rgba(0,0,0,.12);
}
.modal-box .card-title { margin-bottom: var(--sp-2); }
.modal-box .modal-actions { display: flex; gap: var(--sp-1); margin-top: var(--sp-3); }
.modal-checkbox {
    display: flex; align-items: center; gap: 8px;
    font-size: 13px; color: var(--text-mid); font-weight: 400;
    cursor: pointer; margin-bottom: var(--sp-2);
}
.modal-checkbox input { accent-color: var(--pink-hover); width: 16px; height: 16px; cursor: pointer; }

/* --- 响应式：平板 --- */
@media (max-width: 900px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--dur) var(--ease);
        width: 260px;
    }
    .sidebar.open { transform: translateX(0); }
    .admin-main { margin-left: 0; }
    .admin-content { padding: var(--sp-3) var(--sp-2); }
    .admin-header { padding: var(--sp-2) var(--sp-3); }
    .hamburger { display: flex !important; }
    .sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.3); z-index: 40; }
    .sidebar-overlay.active { display: block; }
}

/* --- 响应式：手机 --- */
@media (max-width: 640px) {
    /* 侧边栏 */
    .sidebar { width: 80vw; max-width: 300px; }

    /* 头部 */
    .admin-header { padding: var(--sp-2); position: sticky; top: 0; }
    .header-inner { gap: var(--sp-1); }
    .page-title { font-size: 16px; }
    .breadcrumb { font-size: 11px; }

    /* 内容区 */
    .admin-content { padding: var(--sp-2); }

    /* 卡片 */
    .card { padding: var(--sp-3); border-radius: var(--r-lg); margin-bottom: var(--sp-2); }
    .card-title { font-size: 14px; margin-bottom: var(--sp-2); }

    /* 统计卡片：2列 */
    .stat-grid { grid-template-columns: repeat(2, 1fr); gap: var(--sp-2); }
    .stat-card { padding: var(--sp-2); border-radius: var(--r-lg); }
    .stat-card .num { font-size: 26px; }
    .stat-card .label { font-size: 12px; }

    /* 表格：紧凑 */
    .data-table { font-size: 12px; min-width: 500px; }
    .data-table thead th { padding: 10px 10px; font-size: 11px; }
    .data-table tbody td { padding: 10px 10px; }
    .table-wrap { border-radius: var(--r-lg); -webkit-overflow-scrolling: touch; }

    /* 表单：单列 */
    .form-row { flex-direction: column; gap: 0; }
    .form-row > .form-group { min-width: 0; }
    .form-control { padding: 12px 14px; font-size: 15px; /* 防止 iOS 自动缩放 */ }

    /* 按钮：更大触控区域 */
    .btn { min-height: 44px; padding: 10px 18px; font-size: 14px; }
    .btn-sm { min-height: 36px; padding: 8px 14px; font-size: 13px; }
    .actions { gap: 8px; }

    /* 工具条 */
    .toolbar { flex-direction: column; align-items: stretch; gap: var(--sp-2); }
    .toolbar-group { justify-content: flex-start; overflow-x: auto; -webkit-overflow-scrolling: touch; }

    /* 模态弹窗：底部抽屉式 */
    .modal-box { width: 94vw; max-width: 94vw; padding: var(--sp-3); border-radius: var(--r-lg); }

    /* 活动卡片 */
    .activity-grid { grid-template-columns: 1fr; }

    /* 分页 */
    .pagination { gap: 2px; }
    .page-link { min-width: 36px; height: 36px; font-size: 13px; }
    .page-info { display: block; width: 100%; text-align: center; margin-left: 0; margin-top: var(--sp-1); }

    /* Toast */
    .toast-container { top: auto; bottom: 20px; right: 12px; left: 12px; }
    .toast { max-width: 100%; }

    /* 公告行 */
    .notice-row { padding: 12px var(--sp-1); }

    /* Tab 栏 */
    .tab-btn { padding: 12px 16px; font-size: 13px; }
}

/* --- 超小屏幕 --- */
@media (max-width: 380px) {
    .stat-grid { grid-template-columns: 1fr; }
    .card { padding: var(--sp-2); }
    .admin-content { padding: var(--sp-2) 8px; }
}

/* --- 汉堡菜单按钮 --- */
.hamburger {
    display: none;
    align-items: center; justify-content: center;
    width: 36px; height: 36px; border: none; background: transparent;
    cursor: pointer; padding: 0;
}
.hamburger span {
    display: block; width: 20px; height: 2px; background: var(--text);
    position: relative; transition: all var(--dur) var(--ease);
}
.hamburger span::before,
.hamburger span::after {
    content: ''; position: absolute; left: 0; width: 100%; height: 2px;
    background: var(--text); transition: all var(--dur) var(--ease);
}
.hamburger span::before { top: -6px; }
.hamburger span::after { bottom: -6px; }

/* --- 分页 --- */
.pagination {
    display: flex; align-items: center; justify-content: center;
    gap: 4px; margin-top: var(--sp-3); padding: var(--sp-2) 0; flex-wrap: wrap;
}
.page-link {
    display: inline-flex; align-items: center; justify-content: center;
    min-width: 32px; height: 32px; padding: 0 8px;
    border: 1px solid var(--line); border-radius: 6px;
    font-size: 13px; color: var(--text-mid); background: var(--surface);
    transition: all var(--dur) var(--ease);
}
a.page-link:hover { border-color: var(--pink-deep); color: var(--text); background: var(--pink-tint); }
.page-link.active {
    background: linear-gradient(135deg, #FBE0E3, #F6CBD2);
    border-color: transparent; color: var(--text); font-weight: 500;
}
.page-dots { color: var(--text-soft); font-size: 13px; padding: 0 4px; }
.page-info { font-size: 12px; color: var(--text-soft); margin-left: var(--sp-2); }

/* --- Toast 通知 --- */
.toast-container {
    position: fixed; top: 20px; right: 20px; z-index: 9999;
    display: flex; flex-direction: column; gap: 10px;
    pointer-events: none;
}
.toast {
    display: flex; align-items: center; gap: 10px;
    padding: 14px 20px; border-radius: var(--r-md);
    font-size: 14px; color: var(--text); background: var(--surface);
    box-shadow: 0 8px 30px rgba(0,0,0,.12), 0 2px 8px rgba(0,0,0,.06);
    animation: toastSlideIn .35s cubic-bezier(.21,1.02,.73,1);
    max-width: 380px; min-width: 240px;
    pointer-events: auto;
    border-left: 4px solid transparent;
    position: relative;
}
.toast-icon { flex-shrink: 0; width: 20px; height: 20px; display: flex; align-items: center; justify-content: center; }
.toast-icon svg { width: 20px; height: 20px; }
.toast-msg { flex: 1; line-height: 1.5; }
.toast-close {
    flex-shrink: 0; width: 20px; height: 20px;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; font-size: 16px; color: var(--text-soft);
    border-radius: 4px; transition: all .15s ease;
    opacity: .6;
}
.toast-close:hover { opacity: 1; background: rgba(0,0,0,.05); }
.toast-success { border-left-color: var(--ok); }
.toast-success .toast-icon { color: var(--ok); }
.toast-error { border-left-color: var(--danger); }
.toast-error .toast-icon { color: var(--danger); }
.toast-warning { border-left-color: #f0a030; }
.toast-warning .toast-icon { color: #f0a030; }
.toast-info { border-left-color: var(--pink-hover); }
.toast-info .toast-icon { color: var(--pink-hover); }
.toast-out {
    animation: toastSlideOut .3s ease forwards;
}
@keyframes toastSlideIn {
    from { opacity: 0; transform: translateX(40px) scale(.95); }
    to { opacity: 1; transform: translateX(0) scale(1); }
}
@keyframes toastSlideOut {
    from { opacity: 1; transform: translateX(0) scale(1); }
    to { opacity: 0; transform: translateX(40px) scale(.95); }
}

/* --- 弹窗动画 --- */
.modal-box {
    animation: modalBoxIn .25s cubic-bezier(.21,1.02,.73,1);
}
.modal-box-leave {
    animation: modalBoxOut .2s ease forwards;
}
@keyframes modalBoxIn {
    from { opacity: 0; transform: scale(.92) translateY(10px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}
@keyframes modalBoxOut {
    from { opacity: 1; transform: scale(1); }
    to { opacity: 0; transform: scale(.95); }
}

/* --- 按钮 loading 状态 --- */
.btn-loading { opacity: .7; cursor: wait; }
.btn-spinner {
    display: inline-block; width: 14px; height: 14px;
    border: 2px solid rgba(255,255,255,.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin .6s linear infinite;
    vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }