/* ===== 全局重置 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

/* 移动端触摸优化：消除300ms点击延迟 */
html {
    touch-action: manipulation;
    -webkit-text-size-adjust: 100%;
}
body {
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
    overscroll-behavior-y: none;
}

/* 触摸设备禁用hover效果（避免点击后卡住hover状态） */
@media (hover: none) {
    .btn-primary:hover { transform: none; box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3); }
    .btn-danger:hover { transform: none; box-shadow: none; }
    .btn-outline:hover { color: var(--text-secondary); border-color: var(--border); background: var(--card-bg); }
    .nav-item:hover { color: rgba(255, 255, 255, 0.6); background: none; }
    .data-table tbody tr:hover { background: transparent; }
    .post-card:hover { box-shadow: var(--shadow); }
    .like-btn:hover { background: #fff1f2; border-color: #fecdd3; }
    .msg-item:hover { background: transparent; }
    .chat-user-item:hover { background: transparent; }
    .modal-close:hover { background: #f1f5f9; }
    .btn-link:hover { background: transparent; }
    .btn-link.danger:hover { background: transparent; }
    .sidebar-footer .btn-outline:hover { color: rgba(255, 255, 255, 0.7); border-color: rgba(255, 255, 255, 0.2); background: transparent; }
}

/* 滚动性能优化 */
.table-container, .message-list, .chat-messages, .sidebar-nav {
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
}

/* 离屏内容跳过渲染（提升长列表流畅度） */
.data-table tbody tr,
.post-card,
.chat-user-item,
.chat-bubble {
    content-visibility: auto;
    contain-intrinsic-size: 60px;
}
.post-card { contain-intrinsic-size: 120px; }
.chat-bubble { contain-intrinsic-size: 50px; }

/* 动画优化：只动画transform和opacity */
.page, .modal, .toast, .spiderman-overlay * {
    will-change: transform, opacity;
}

/* 减少低端设备的阴影渲染 */
@media (max-width: 768px) {
    .auth-box { box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15); }
    .modal-content { box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15); }
    .post-card { box-shadow: var(--shadow); }
    /* 缩短动画时长，感觉更跟手 */
    .page { animation-duration: 0.2s; }
    .modal-content { animation-duration: 0.18s; }
    .toast { animation-duration: 0.2s; }
    /* 防止iOS输入框聚焦自动放大 */
    input, textarea, select { font-size: 16px !important; }
}

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --primary-bg: #eef2ff;
    --sidebar-bg: #1e1b4b;
    --sidebar-hover: #312e81;
    --sidebar-active: #6366f1;
    --bg: #f0f2f5;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
    line-height: 1.6;
}

.hidden { display: none !important; }

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 9px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    gap: 6px;
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}
.btn-primary:active { transform: translateY(0); }

.btn-danger {
    background: linear-gradient(135deg, #f87171, #ef4444);
    color: #fff;
}
.btn-danger:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.btn-outline {
    background: var(--card-bg);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}
.btn-outline:hover {
    color: var(--primary);
    border-color: var(--primary);
    background: var(--primary-bg);
}

.btn-sm { padding: 5px 12px; font-size: 12px; }
.btn-block { width: 100%; }

.btn-link {
    background: none;
    border: none;
    color: var(--primary);
    cursor: pointer;
    padding: 4px 8px;
    font-size: 13px;
    font-weight: 500;
    border-radius: 6px;
    transition: all 0.15s;
}
.btn-link:hover { background: var(--primary-bg); }
.btn-link.danger { color: var(--danger); }
.btn-link.danger:hover { background: #fef2f2; }

/* ===== 表单 ===== */
.form-group { margin-bottom: 18px; }
.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--text);
    font-size: 13px;
}
.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px 14px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    transition: all 0.2s;
    outline: none;
    font-family: inherit;
    background: #f8fafc;
    color: var(--text);
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-light); }
.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
}
.form-group textarea { resize: vertical; }
.form-row { display: flex; gap: 16px; }
.form-row .form-group { flex: 1; }

/* ===== 登录/注册页面 ===== */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #6b21a8 100%);
    position: relative;
    overflow: hidden;
}
.auth-container::before, .auth-container::after {
    content: "";
    position: absolute;
    border-radius: 50%;
    opacity: 0.15;
}
.auth-container::before { width: 500px; height: 500px; background: #fff; top: -150px; right: -100px; }
.auth-container::after { width: 300px; height: 300px; background: #fff; bottom: -80px; left: -50px; }

.auth-box {
    background: rgba(255, 255, 255, 0.97);
    padding: 44px 40px;
    border-radius: 20px;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.25);
    width: 420px;
    max-width: 92vw;
    position: relative;
    z-index: 1;
    backdrop-filter: blur(10px);
}
.auth-title { text-align: center; margin-bottom: 8px; color: var(--text); font-size: 26px; font-weight: 700; letter-spacing: -0.5px; }
.auth-subtitle { text-align: center; margin-bottom: 28px; color: var(--text-light); font-size: 14px; }
.auth-tabs { display: flex; margin-bottom: 28px; background: #f1f5f9; border-radius: 10px; padding: 4px; }
.auth-tab {
    flex: 1; padding: 10px; background: none; border: none; font-size: 15px;
    font-weight: 500; cursor: pointer; color: var(--text-light); border-radius: 8px; transition: all 0.25s;
}
.auth-tab.active { color: var(--primary-dark); background: #fff; box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08); }
.auth-form .btn { margin-top: 8px; padding: 12px; font-size: 15px; }
.auth-message { margin-top: 18px; padding: 11px 16px; border-radius: var(--radius-sm); font-size: 13px; text-align: center; font-weight: 500; }
.auth-message.error { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }
.auth-message.success { background: #f0fdf4; color: var(--success); border: 1px solid #bbf7d0; }

/* ===== 主界面布局 ===== */
.main-container { display: flex; min-height: 100vh; }

.sidebar {
    width: 240px;
    background: var(--sidebar-bg);
    color: #fff;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 100;
}

.sidebar-header {
    padding: 24px 20px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.sidebar-logo {
    width: 40px; height: 40px;
    background: var(--primary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}
.sidebar-header h2 { font-size: 18px; color: #fff; font-weight: 700; }

.sidebar-nav {
    flex: 1;
    padding: 12px 12px;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 12px 16px;
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
    gap: 12px;
    border-radius: 10px;
    margin-bottom: 4px;
}
.nav-item:hover { color: #fff; background: rgba(255, 255, 255, 0.08); }
.nav-item.active {
    color: #fff;
    background: var(--sidebar-active);
}
.nav-icon { font-size: 18px; width: 24px; text-align: center; }

.nav-badge {
    position: absolute;
    right: 12px;
    background: var(--danger);
    color: #fff;
    border-radius: 10px;
    padding: 1px 7px;
    font-size: 11px;
    font-weight: 600;
    line-height: 1.4;
}
.nav-item { position: relative; }

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}
.user-info { display: flex; align-items: center; gap: 10px; padding: 10px 8px 14px; }
.user-avatar {
    width: 40px; height: 40px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 600;
    flex-shrink: 0;
}
.user-detail { flex: 1; min-width: 0; }
.user-detail .name { color: #fff; font-weight: 600; font-size: 15px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-detail .role { color: rgba(255, 255, 255, 0.5); font-size: 12px; }
.sidebar-footer .btn { width: 100%; margin-top: 8px; }
.sidebar-footer .btn-outline {
    color: rgba(255, 255, 255, 0.7);
    border-color: rgba(255, 255, 255, 0.2);
    background: transparent;
}
.sidebar-footer .btn-outline:hover {
    color: #fff;
    border-color: rgba(255, 255, 255, 0.4);
    background: rgba(255, 255, 255, 0.08);
}
.sidebar-footer .btn-danger {
    margin-top: 8px;
}

/* ===== 内容区 ===== */
.content {
    flex: 1;
    margin-left: 240px;
    padding: 28px;
    min-height: 100vh;
}

.page { display: none; animation: fadeIn 0.3s ease; }
.page.active { display: block; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}
.page-header h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.3px;
}

/* ===== 表格 ===== */
.table-container {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    border: 1px solid var(--border);
}
.data-table { width: 100%; border-collapse: collapse; }
.data-table th {
    background: #f8fafc;
    padding: 16px 20px;
    text-align: left;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 13px;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}
.data-table td {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
    max-width: 220px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 14px;
}
.data-table tbody tr { transition: background 0.15s; }
.data-table tbody tr:hover { background: #f8fafc; }
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table .actions { white-space: nowrap; }
.empty-row td { text-align: center; padding: 60px; color: var(--text-light); font-size: 14px; }

/* ===== 弹窗 ===== */
.modal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}
.modal-content {
    background: #fff;
    border-radius: 16px;
    width: 560px;
    max-width: 92vw;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.25);
    animation: slideUp 0.25s ease;
}
@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}
.modal-sm { width: 420px; }
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 28px;
    border-bottom: 1px solid var(--border);
}
.modal-header h3 { font-size: 17px; font-weight: 600; color: var(--text); }
.modal-close {
    background: #f1f5f9;
    border: none;
    width: 32px; height: 32px;
    border-radius: 8px;
    font-size: 18px;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
}
.modal-close:hover { background: #e2e8f0; color: var(--text); }
.modal-content form { padding: 24px 28px; }
.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    margin-top: 8px;
}

/* ===== Toast ===== */
.toast {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    padding: 12px 24px;
    border-radius: 10px;
    color: #fff;
    font-size: 14px;
    font-weight: 500;
    z-index: 2000;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    animation: slideDown 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}
.toast.success { background: linear-gradient(135deg, #34d399, var(--success)); }
.toast.error { background: linear-gradient(135deg, #f87171, var(--danger)); }
.toast.info { background: linear-gradient(135deg, var(--primary-light), var(--primary)); }
@keyframes slideDown {
    from { opacity: 0; transform: translateX(-50%) translateY(-20px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ===== 移动端菜单按钮 ===== */
.mobile-menu-btn {
    display: none;
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 200;
    width: 42px;
    height: 42px;
    border-radius: 10px;
    background: var(--sidebar-bg);
    color: #fff;
    border: none;
    font-size: 20px;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    align-items: center;
    justify-content: center;
}
.mobile-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 99;
}
.mobile-overlay.active { display: block; }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    /* 侧边栏改为抽屉 */
    .sidebar {
        width: 260px;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        box-shadow: 4px 0 20px rgba(0,0,0,0.2);
    }
    .sidebar.open { transform: translateX(0); }
    .sidebar-header h2 { display: block; }
    .user-detail { display: block; }
    .nav-item span:not(.nav-icon) { display: inline; }
    .sidebar-header { justify-content: flex-start; padding: 24px 20px 20px; }
    .nav-item { justify-content: flex-start; padding: 12px 16px; }

    .mobile-menu-btn { display: flex; }

    /* 内容区 */
    .content {
        margin-left: 0;
        padding: 60px 14px 20px;
    }

    /* 页面标题 */
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
        margin-bottom: 18px;
    }
    .page-header h2 { font-size: 20px; }
    .page-header .btn { width: 100%; }

    /* 表格横向滚动 */
    .table-container { overflow-x: auto; -webkit-overflow-scrolling: touch; }
    .data-table { min-width: 600px; }
    .data-table th, .data-table td { padding: 12px 14px; font-size: 13px; }

    /* 表单 */
    .form-row { flex-direction: column; gap: 0; }
    .auth-box { padding: 28px 20px; width: 94vw; }
    .auth-title { font-size: 22px; }

    /* 弹窗 */
    .modal-content { width: 94vw; max-width: 94vw; border-radius: 14px; }
    .modal-header { padding: 16px 18px; }
    .modal-content form { padding: 18px; }
    .modal-footer { flex-direction: column-reverse; }
    .modal-footer .btn { width: 100%; }

    /* 私信布局：上下堆叠 */
    .message-layout {
        flex-direction: column;
        height: auto;
        gap: 12px;
    }
    .message-list {
        width: 100%;
        max-height: 40vh;
        overflow-y: auto;
    }
    .message-chat {
        min-height: 50vh;
    }
    .chat-bubble { max-width: 75%; }

    /* 帖子卡片 */
    .post-card { padding: 14px; }
    .post-card-footer { flex-wrap: wrap; gap: 10px; }

    /* Toast */
    .toast {
        left: 16px;
        right: 16px;
        transform: none;
        width: auto;
        justify-content: center;
    }
    @keyframes slideDown {
        from { opacity: 0; transform: translateY(-20px); }
        to { opacity: 1; transform: translateY(0); }
    }
}

@media (max-width: 480px) {
    .content { padding: 56px 10px 16px; }
    .auth-box { padding: 24px 16px; }
    .data-table { min-width: 500px; }
    .chat-bubble { max-width: 82%; }
    .post-card-header { flex-wrap: wrap; }
    .post-time { margin-left: 0; width: 100%; }
}

/* ===== 点赞按钮 ===== */
.like-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 14px;
    border: 1.5px solid #fecdd3;
    border-radius: 20px;
    background: #fff1f2;
    cursor: pointer;
    font-size: 14px;
    color: #e11d48;
    transition: all 0.2s;
}
.like-btn:hover {
    background: #ffe4e6;
    border-color: #fda4af;
}
.like-btn.liked {
    background: #ffe4e6;
    border-color: #fda4af;
}
.like-icon { font-size: 15px; }
.like-count { font-weight: 600; }

/* ===== 评论/帖子卡片 ===== */
.badge-reply { background: #e0e7ff; color: #4f46e5; margin-left: 4px; padding: 2px 8px; border-radius: 6px; font-size: 11px; }
.comment-img { max-width: 150px; max-height: 100px; border-radius: 6px; cursor: pointer; margin-top: 4px; }

.post-list { display: flex; flex-direction: column; gap: 16px; }
.post-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    cursor: pointer;
    transition: box-shadow 0.2s;
}
.post-card:hover { box-shadow: var(--shadow-md); }
.post-card-header { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.post-avatar {
    width: 36px; height: 36px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}
.post-avatar-sm {
    width: 24px; height: 24px;
    border-radius: 50%;
    background: #c7d2fe;
    color: #4338ca;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    margin-right: 6px;
}
.post-author { font-weight: 600; }
.post-time { color: var(--text-light); font-size: 12px; margin-left: auto; }
.post-card-content { margin: 8px 0; line-height: 1.6; }
.post-img { max-width: 200px; max-height: 150px; border-radius: 8px; margin: 8px 0; }
.post-card-footer { display: flex; align-items: center; gap: 16px; margin-top: 8px; }
.post-reply-count { color: var(--text-secondary); font-size: 14px; cursor: pointer; }
.post-reply-count:hover { color: var(--primary); }
.post-preview-reply {
    margin-top: 8px;
    padding: 8px 12px;
    background: #f9fafb;
    border-radius: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}
.detail-main { padding: 12px 0; border-bottom: 1px solid var(--border); }
.detail-replies-title { font-weight: 600; margin: 12px 0; }
.detail-reply { display: flex; gap: 8px; padding: 10px 0; border-bottom: 1px solid #f3f4f6; }
.detail-reply-body { flex: 1; }
.detail-reply-actions { margin-top: 4px; }
.empty-state { text-align: center; color: var(--text-light); padding: 40px; }

/* ===== 私信 ===== */
.message-layout { display: flex; gap: 20px; height: calc(100vh - 140px); }
.message-list { width: 300px; overflow-y: auto; }
.msg-item { padding: 10px; border-bottom: 1px solid var(--border); cursor: pointer; border-radius: 6px; }
.msg-item:hover { background: #f3f4f6; }
.msg-item.unread { background: var(--primary-bg); font-weight: bold; }
.msg-time { display: block; font-size: 11px; color: var(--text-light); margin-top: 2px; }
.empty-msg { color: var(--text-light); padding: 10px; }
.message-chat {
    flex: 1;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    background: white;
}
.chat-header { padding: 12px 16px; background: #f9fafb; border-bottom: 1px solid var(--border); font-weight: 600; }
.chat-messages { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.chat-bubble { max-width: 60%; padding: 10px 14px; border-radius: 12px; }
.chat-bubble.mine { align-self: flex-end; background: var(--primary); color: white; }
.chat-bubble.theirs { align-self: flex-start; background: #f3f4f6; }
.bubble-sender { font-size: 12px; opacity: 0.8; margin-bottom: 2px; }
.bubble-time { font-size: 11px; opacity: 0.7; margin-top: 4px; }
.chat-input { display: flex; gap: 10px; padding: 12px; border-top: 1px solid var(--border); }
.chat-input input { flex: 1; padding: 8px 12px; border: 1px solid var(--border); border-radius: 8px; }

.msg-badge {
    display: inline-block;
    background: var(--danger);
    color: white;
    border-radius: 10px;
    padding: 1px 7px;
    font-size: 11px;
    margin-left: 4px;
}
.msg-badge.hidden { display: none; }

/* ===== 私信折叠面板 ===== */
.msg-section {
    border-bottom: 1px solid var(--border);
}
.msg-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 14px;
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    color: var(--text);
    background: #f8fafc;
    transition: background 0.15s;
    user-select: none;
}
.msg-section-header:hover { background: #f1f5f9; }
.msg-section-arrow {
    font-size: 10px;
    color: var(--text-secondary);
    transition: transform 0.2s;
}
.msg-section.collapsed .msg-section-arrow { transform: rotate(-90deg); }
.msg-section-body {
    max-height: 500px;
    overflow-y: auto;
    transition: max-height 0.3s ease;
}
.msg-section.collapsed .msg-section-body { max-height: 0; overflow: hidden; }

/* 用户聊天项 */
.chat-user-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    cursor: pointer;
    border-bottom: 1px solid #f3f4f6;
    transition: background 0.15s;
}
.chat-user-item:hover { background: #f8fafc; }
.chat-user-item.active { background: var(--primary-bg); }
.chat-user-avatar {
    width: 38px; height: 38px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 15px;
    flex-shrink: 0;
}
.chat-user-info { flex: 1; min-width: 0; }
.chat-user-name {
    font-weight: 600;
    font-size: 14px;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.chat-user-preview {
    font-size: 12px;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-top: 2px;
}
.chat-user-time {
    font-size: 11px;
    color: var(--text-light);
    flex-shrink: 0;
}
.chat-user-unread {
    background: var(--danger);
    color: #fff;
    border-radius: 10px;
    padding: 1px 6px;
    font-size: 10px;
    font-weight: 600;
    flex-shrink: 0;
}
.empty-chat-list {
    padding: 20px;
    text-align: center;
    color: var(--text-light);
    font-size: 13px;
}

/* ===== 图片上传 ===== */
.image-upload-area { display: flex; flex-direction: column; gap: 10px; }
.image-preview-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.image-preview-grid.hidden { display: none; }
.image-preview-item {
    position: relative;
    width: 80px;
    height: 80px;
}
.image-preview-item img {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: 8px;
    border: 1px solid var(--border);
}
.image-remove-btn {
    position: absolute;
    top: -6px;
    right: -6px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--danger);
    color: #fff;
    border: none;
    font-size: 11px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
    z-index: 1;
}

/* 聊天图片按钮 */
.chat-img-btn {
    padding: 8px 12px;
    font-size: 16px;
    flex-shrink: 0;
}
.chat-image-preview {
    padding: 8px 12px;
    background: #f9fafb;
    border-top: 1px solid var(--border);
}
.chat-image-preview.hidden { display: none; }

/* 消息/评论中的图片 */
.msg-image, .comment-image {
    max-width: 200px;
    max-height: 200px;
    border-radius: 8px;
    margin-top: 6px;
    cursor: pointer;
    object-fit: cover;
}
.chat-bubble .msg-image {
    max-width: 150px;
    max-height: 150px;
    border-radius: 8px;
    margin-top: 4px;
}
/* 多图网格展示 */
.image-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
    margin-top: 6px;
}
.image-grid .msg-image,
.image-grid .comment-image {
    max-width: 100%;
    max-height: 120px;
    width: 100%;
    height: 120px;
    margin-top: 0;
}
.chat-bubble .image-grid {
    grid-template-columns: repeat(2, 1fr);
    max-width: 200px;
}
.chat-bubble .image-grid .msg-image {
    max-height: 100px;
    height: 100px;
}

/* ===== 表情选择器 ===== */
.textarea-with-emoji { position: relative; }
.emoji-toggle-btn {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: background 0.15s;
    z-index: 2;
}
.emoji-toggle-btn:hover { background: var(--primary-bg); }

.emoji-picker {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) scale(0.9);
    width: 340px;
    max-width: 90vw;
    background: #fff;
    border-radius: 14px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    border: 1px solid var(--border);
    z-index: 1500;
    display: none;
    overflow: hidden;
}
.emoji-picker.active {
    display: block;
    animation: emojiPop 0.18s ease;
}
@keyframes emojiPop {
    from { opacity: 0; transform: translateX(-50%) scale(0.85) translateY(10px); }
    to { opacity: 1; transform: translateX(-50%) scale(1) translateY(0); }
}
.emoji-picker-tabs {
    display: flex;
    background: #f8fafc;
    border-bottom: 1px solid var(--border);
    padding: 4px;
    gap: 2px;
    overflow-x: auto;
}
.emoji-tab {
    flex: 1;
    min-width: 36px;
    padding: 6px 0;
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    border-radius: 6px;
    transition: background 0.15s;
    white-space: nowrap;
}
.emoji-tab:hover { background: #eef2ff; }
.emoji-tab.active { background: var(--primary-bg); }
.emoji-picker-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 2px;
    padding: 8px;
    max-height: 200px;
    overflow-y: auto;
}
.emoji-item {
    font-size: 22px;
    padding: 6px 0;
    text-align: center;
    cursor: pointer;
    border-radius: 6px;
    transition: background 0.1s, transform 0.1s;
    line-height: 1;
}
.emoji-item:hover {
    background: var(--primary-bg);
    transform: scale(1.2);
}
.emoji-item:active { transform: scale(0.95); }

@media (max-width: 768px) {
    .emoji-picker { width: 300px; bottom: 120px; }
    .emoji-picker-grid { grid-template-columns: repeat(7, 1fr); max-height: 180px; }
    .emoji-item { font-size: 20px; }
}

.bubble-del { cursor: pointer; opacity: 0.6; margin-left: 8px; font-size: 11px; }
.bubble-del:hover { opacity: 1; }

/* ===== Q版蜘蛛侠彩蛋 ===== */
.spiderman-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    pointer-events: none;
    z-index: 3000;
    display: none;
}
.spiderman-overlay.active { display: block; }

/* 蛛丝 */
.spider-web {
    position: absolute;
    top: 0;
    left: 50%;
    width: 3px;
    height: 120px;
    background: linear-gradient(to bottom, rgba(255,255,255,0.9), rgba(255,255,255,0.3));
    transform-origin: top center;
    animation: webSwing 2.5s ease-in-out;
}

/* 蜘蛛侠身体 */
.chibi-spiderman {
    position: absolute;
    top: 110px;
    left: 50%;
    transform: translateX(-50%);
    animation: spidermanAppear 2.5s ease-in-out;
}

/* 头 */
.spider-head {
    width: 70px;
    height: 70px;
    background: #d32f2f;
    border-radius: 50%;
    position: relative;
    margin: 0 auto;
    box-shadow: inset -8px -8px 0 rgba(0,0,0,0.15);
}
/* 大眼睛 */
.spider-eye {
    position: absolute;
    top: 22px;
    width: 20px;
    height: 24px;
    background: #fff;
    border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
    border: 2px solid #1a1a1a;
}
.spider-eye.left { left: 10px; transform: rotate(-10deg); }
.spider-eye.right { right: 10px; transform: rotate(10deg); }
/* 蛛网纹 */
.spider-head::before {
    content: "";
    position: absolute;
    top: 6px; left: 50%;
    transform: translateX(-50%);
    width: 50px; height: 50px;
    background:
        radial-gradient(circle at 50% 50%, transparent 30%, rgba(0,0,0,0.15) 31%, transparent 32%),
        radial-gradient(circle at 50% 50%, transparent 45%, rgba(0,0,0,0.15) 46%, transparent 47%);
    border-radius: 50%;
}

/* 身体 */
.spider-body {
    width: 56px;
    height: 45px;
    background: #1565c0;
    border-radius: 16px 16px 12px 12px;
    margin: -6px auto 0;
    position: relative;
    box-shadow: inset -5px -5px 0 rgba(0,0,0,0.15);
}
/* 胸口蜘蛛 */
.spider-body::before {
    content: "🕷️";
    position: absolute;
    top: 8px; left: 50%;
    transform: translateX(-50%);
    font-size: 18px;
}
/* 红肩 */
.spider-body::after {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 14px;
    background: #d32f2f;
    border-radius: 16px 16px 0 0;
}

/* 手臂 */
.spider-arm {
    position: absolute;
    top: 12px;
    width: 14px;
    height: 30px;
    background: #d32f2f;
    border-radius: 8px;
}
.spider-arm.left { left: -10px; transform: rotate(25deg); }
.spider-arm.right { right: -10px; transform: rotate(-25deg); }

/* 腿 */
.spider-legs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: -2px;
}
.spider-leg {
    width: 16px;
    height: 18px;
    background: #1565c0;
    border-radius: 0 0 8px 8px;
}

@keyframes webSwing {
    0% { transform: rotate(-30deg) scaleY(0); opacity: 0; }
    15% { transform: rotate(-30deg) scaleY(1); opacity: 1; }
    35% { transform: rotate(15deg); }
    55% { transform: rotate(-10deg); }
    75% { transform: rotate(5deg); opacity: 1; }
    100% { transform: rotate(0deg) scaleY(0.5); opacity: 0; }
}

@keyframes spidermanAppear {
    0% { transform: translateX(-50%) translateY(-200px) rotate(-20deg); opacity: 0; }
    15% { transform: translateX(-50%) translateY(0) rotate(10deg); opacity: 1; }
    25% { transform: translateX(-50%) translateY(-10px) rotate(-5deg); }
    35% { transform: translateX(-50%) translateY(0) rotate(0deg); }
    70% { transform: translateX(-50%) translateY(0) scale(1); opacity: 1; }
    80% { transform: translateX(-50%) translateY(-15px) scale(1.05); }
    100% { transform: translateX(-50%) translateY(-300px) rotate(15deg) scale(0.8); opacity: 0; }
}