/* ============================================================
   留言板 — 现代设计系统 v4.0
   专业级管理后台 UI
   ============================================================ */

/* ---------- CSS 变量 ---------- */
:root {
    --color-primary: #6366f1;
    --color-primary-hover: #4f46e5;
    --color-primary-light: #eef2ff;
    --color-primary-glow: rgba(99, 102, 241, 0.2);
    --color-primary-dark: #4338ca;

    --color-success: #10b981;
    --color-success-light: #ecfdf5;
    --color-success-glow: rgba(16, 185, 129, 0.2);
    --color-warning: #f59e0b;
    --color-warning-light: #fffbeb;
    --color-danger: #ef4444;
    --color-danger-light: #fef2f2;
    --color-info: #3b82f6;
    --color-info-light: #eff6ff;

    --color-bg: #f1f5f9;
    --color-bg-alt: #f8fafc;
    --color-surface: #ffffff;
    --color-surface-hover: #f8fafc;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;

    --color-text: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #94a3b8;

    --sidebar-bg: #0f172a;
    --sidebar-bg-alt: #1e293b;
    --sidebar-text: #94a3b8;
    --sidebar-text-active: #ffffff;
    --sidebar-border: rgba(255, 255, 255, 0.06);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;

    --shadow-sm: 0 1px 2px rgba(0,0,0,.04);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,.06), 0 2px 4px -2px rgba(0,0,0,.04);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.07), 0 4px 6px -4px rgba(0,0,0,.04);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,.08), 0 8px 10px -6px rgba(0,0,0,.04);

    --font-sans: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Fira Code', 'Consolas', monospace;

    --transition: 0.2s cubic-bezier(.4,0,.2,1);
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
body{font-family:var(--font-sans);color:var(--color-text);line-height:1.6;background:var(--color-bg);min-height:100vh}

a{color:var(--color-primary);text-decoration:none;transition:color var(--transition)}
a:hover{color:var(--color-primary-hover)}
img{max-width:100%;display:block}

/* ============================================================
   前台样式
   ============================================================ */
.front-body {
    background: linear-gradient(160deg, #eef2ff 0%, #e0e7ff 25%, #f1f5f9 50%, #f8fafc 100%);
    background-attachment: fixed;
}
.front-body::before {
    content: ''; position: fixed; inset: 0;
    background: radial-gradient(ellipse 80% 60% at 20% 15%, rgba(99,102,241,.08) 0%, transparent 60%),
                radial-gradient(ellipse 60% 50% at 80% 80%, rgba(99,102,241,.06) 0%, transparent 60%);
    pointer-events: none; z-index: 0;
}

.container { max-width: 800px; margin: 0 auto; padding: 24px 20px 60px; position: relative; z-index: 1; }

.site-header { text-align: center; padding: 48px 20px 32px; }
.site-header .logo-icon { display: inline-flex; align-items: center; justify-content: center; width: 72px; height: 72px; background: linear-gradient(135deg, var(--color-primary), #8b5cf6); border-radius: var(--radius-xl); font-size: 36px; color: #fff; margin-bottom: 20px; box-shadow: 0 8px 32px var(--color-primary-glow); }
.site-header h1 { font-size: 36px; font-weight: 800; letter-spacing: -0.5px; color: var(--color-text); margin-bottom: 8px; }
.site-header .subtitle { font-size: 16px; color: var(--color-text-secondary); font-weight: 400; }

.card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 28px; margin-bottom: 20px; box-shadow: var(--shadow-sm); transition: box-shadow var(--transition); }
.card:hover { box-shadow: var(--shadow-md); }
.card h2, .card h3 { margin-bottom: 16px; color: var(--color-text); font-size: 18px; font-weight: 700; display: flex; align-items: center; gap: 8px; }
.card h2::before, .card h3::before { content: ''; display: inline-block; width: 4px; height: 20px; background: var(--color-primary); border-radius: 2px; }

/* ============================================================
   表单
   ============================================================ */
.form-group { margin-bottom: 18px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 600; color: var(--color-text); font-size: 13px; letter-spacing: 0.3px; }
.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="number"],
.form-group input[type="email"],
.form-group input[type="search"],
.form-group textarea,
.form-group select {
    width: 100%; padding: 10px 14px; border: 1.5px solid var(--color-border);
    border-radius: var(--radius-sm); font-size: 14px; font-family: inherit;
    color: var(--color-text); background: var(--color-surface);
    transition: all var(--transition); outline: none;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-primary-glow); }
.form-group textarea { resize: vertical; min-height: 100px; }

.captcha-group .captcha-row { display: flex; gap: 10px; align-items: center; }
.captcha-group .captcha-row input { flex: 1; min-width: 0; }
.captcha-img { height: 42px; border-radius: var(--radius-sm); cursor: pointer; border: 1.5px solid var(--color-border); transition: border-color var(--transition); }
.captcha-img:hover { border-color: var(--color-primary); }

/* ============================================================
   按钮
   ============================================================ */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 9px 18px; border: none; border-radius: var(--radius-sm); font-size: 13px; font-weight: 600; cursor: pointer; text-decoration: none; transition: all var(--transition); font-family: inherit; white-space: nowrap; line-height: 1.4; }
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark)); color: #fff; box-shadow: 0 2px 8px var(--color-primary-glow); }
.btn-primary:hover { box-shadow: 0 4px 16px var(--color-primary-glow); color: #fff; }
.btn-success { background: var(--color-success); color: #fff; box-shadow: 0 2px 8px var(--color-success-glow); }
.btn-success:hover { box-shadow: 0 4px 16px var(--color-success-glow); color: #fff; }
.btn-warning { background: var(--color-warning); color: #fff; }
.btn-danger { background: var(--color-danger); color: #fff; }
.btn-info { background: var(--color-info); color: #fff; }
.btn-block { display: flex; width: 100%; }
.btn-small { padding: 5px 12px; font-size: 12px; border-radius: 4px; }
.btn-ghost { background: transparent; color: var(--color-text-secondary); border: 1.5px solid var(--color-border); }
.btn-ghost:hover { background: var(--color-surface-hover); border-color: var(--color-primary); color: var(--color-primary); }
.btn-reply { background: var(--color-info-light); color: var(--color-info); border: 1px solid rgba(59,130,246,.2); font-weight: 700; }
.btn-reply:hover { background: var(--color-info); color: #fff; transform: translateY(-1px); }
.btn-icon { width: 36px; height: 36px; padding: 0; border-radius: var(--radius-sm); }

/* ============================================================
   提示
   ============================================================ */
.alert { padding: 14px 18px; border-radius: var(--radius-sm); margin-bottom: 18px; font-size: 14px; font-weight: 500; display: flex; align-items: flex-start; gap: 10px; animation: slideDown 0.3s ease; }
@keyframes slideDown { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }
.alert-error { background: var(--color-danger-light); color: #991b1b; border: 1px solid #fecaca; }
.alert-success { background: var(--color-success-light); color: #065f46; border: 1px solid #a7f3d0; }
.alert-info { background: var(--color-info-light); color: #1e40af; border: 1px solid #bfdbfe; }

/* ============================================================
   前台留言列表
   ============================================================ */
.message-list h2 { font-size: 18px; font-weight: 700; color: var(--color-text); margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.message-list h2::before { content: ''; width: 4px; height: 20px; background: var(--color-primary); border-radius: 2px; display: inline-block; }
.message-old { opacity: 0.85; }
.message-collapse-bar { display: flex; align-items: center; gap: 8px; padding: 8px 12px 8px 52px; cursor: pointer; user-select: none; border-radius: var(--radius-sm); transition: background var(--transition); }
.message-collapse-bar:hover { background: var(--color-bg); }
.collapse-icon { font-size: 10px; color: var(--color-text-muted); transition: transform var(--transition); flex-shrink: 0; }
.collapse-label { font-size: 12px; color: var(--color-text-muted); font-weight: 500; }
.message-header { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.message-header .avatar { width: 40px; height: 40px; border-radius: 50%; background: linear-gradient(135deg, var(--color-primary), #8b5cf6); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 16px; flex-shrink: 0; }
.message-header .nickname { font-weight: 700; color: var(--color-text); font-size: 15px; }
.message-header .message-time { color: var(--color-text-muted); font-size: 12px; }
.message-header .message-floor { margin-left: auto; background: var(--color-bg); color: var(--color-text-muted); padding: 3px 10px; border-radius: 20px; font-size: 12px; font-weight: 600; font-family: var(--font-mono); }
.message-body { color: var(--color-text-secondary); line-height: 1.8; word-break: break-word; font-size: 15px; padding-left: 52px; }
.admin-reply { margin-top: 14px; margin-left: 52px; padding: 14px 16px; background: var(--color-primary-light); border-left: 3px solid var(--color-primary); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.admin-reply .reply-header { font-size: 12px; color: var(--color-primary); font-weight: 700; margin-bottom: 6px; }
.admin-reply .reply-content { color: var(--color-text-secondary); font-size: 14px; line-height: 1.7; }

.replies-section { margin-top: 12px; padding-left: 52px; display: flex; flex-direction: column; gap: 6px; }
.reply-item { display: flex; gap: 10px; padding: 10px 14px; border-radius: var(--radius-sm); animation: slideDown .25s ease; }
.reply-item.reply-admin { background: var(--color-primary-light); border-left: 3px solid var(--color-primary); }
.reply-item.reply-visitor { background: var(--color-bg); border-left: 3px solid var(--color-border); }
.reply-avatar { width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 11px; font-weight: 700; flex-shrink: 0; }
.reply-body { flex: 1; min-width: 0; }
.reply-meta { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; font-size: 12px; }
.reply-nickname { font-weight: 700; color: var(--color-text); }
.reply-item.reply-admin .reply-nickname { color: var(--color-primary); }
.reply-time { color: var(--color-text-muted); font-size: 11px; }
.reply-text { color: var(--color-text-secondary); font-size: 14px; line-height: 1.7; word-break: break-word; }

.message-actions { padding-left: 52px; margin-top: 10px; }
.btn-reply-toggle { display: inline-flex; align-items: center; gap: 4px; padding: 5px 14px; background: transparent; border: 1.5px solid var(--color-border); border-radius: 20px; font-size: 12px; color: var(--color-text-muted); cursor: pointer; font-family: inherit; font-weight: 600; transition: all var(--transition); }
.btn-reply-toggle:hover { border-color: var(--color-primary); color: var(--color-primary); background: var(--color-primary-light); }
.reply-form { padding-left: 52px; margin-top: 10px; animation: slideDown .25s ease; }
.reply-form form { display: flex; flex-direction: column; gap: 8px; }
.reply-form-row { display: flex; gap: 8px; align-items: center; }
.reply-input-nick, .reply-input-captcha, .reply-input-content { padding: 7px 12px; border: 1.5px solid var(--color-border); border-radius: var(--radius-sm); font-size: 13px; font-family: inherit; outline: none; transition: all var(--transition); }
.reply-input-nick:focus, .reply-input-captcha:focus, .reply-input-content:focus { border-color: var(--color-primary); box-shadow: 0 0 0 2px var(--color-primary-glow); }
.reply-input-nick { flex: 1; min-width: 0; }
.reply-input-captcha { width: 90px; text-align: center; }
.reply-input-content { width: 100%; resize: vertical; min-height: 60px; }
.captcha-img-sm { height: 34px; }
.message-meta { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; padding-top: 12px; padding-left: 52px; border-top: 1px solid var(--color-border-light); }
.message-meta .meta-tag { font-size: 11px; color: var(--color-text-muted); background: var(--color-bg); padding: 3px 10px; border-radius: 20px; display: inline-flex; align-items: center; gap: 4px; }

/* 分页 */
.pagination { display: flex; justify-content: center; gap: 4px; margin-top: 24px; flex-wrap: wrap; }
.pagination .page-link { display: inline-flex; align-items: center; justify-content: center; min-width: 38px; height: 38px; padding: 0 10px; background: var(--color-surface); color: var(--color-text-secondary); border: 1.5px solid var(--color-border); border-radius: var(--radius-sm); font-size: 13px; font-weight: 600; transition: all var(--transition); }
.pagination .page-link:hover { background: var(--color-primary-light); color: var(--color-primary); border-color: var(--color-primary); }
.pagination .page-link.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); box-shadow: 0 2px 8px var(--color-primary-glow); }
.pagination .page-link.dots { border: none; cursor: default; min-width: auto; padding: 0 6px; }

.empty-state { text-align: center; padding: 64px 20px; background: var(--color-surface); border: 2px dashed var(--color-border); border-radius: var(--radius-lg); }
.empty-state .empty-icon { margin-bottom: 16px; opacity: 0.6; }
.empty-state p { color: var(--color-text-muted); font-size: 15px; }

.site-footer { text-align: center; padding: 32px 20px; color: var(--color-text-muted); font-size: 13px; }
.site-footer a { color: var(--color-primary); font-weight: 600; }

/* ============================================================
   管理后台 — 布局
   ============================================================ */
.admin-body { background: var(--color-bg); padding: 0; margin: 0; }
.admin-container { width: 100%; min-height: 100vh; }
.admin-layout { display: flex; min-height: 100vh; background: var(--color-bg); }

/* ---------- 侧边栏 ---------- */
.admin-sidebar {
    width: 260px; min-width: 260px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex; flex-direction: column;
    position: relative; z-index: 10;
    border-right: 1px solid var(--sidebar-border);
}
.sidebar-brand { padding: 24px 20px; border-bottom: 1px solid var(--sidebar-border); }
.brand-link { display: flex; align-items: center; gap: 12px; text-decoration: none; color: inherit; }
.brand-link:hover { color: inherit; }
.brand-icon { display: flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: var(--radius-md); background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark)); color: #fff; flex-shrink: 0; }
.brand-text { display: flex; flex-direction: column; }
.brand-name { font-size: 15px; font-weight: 700; color: #fff; letter-spacing: -0.3px; }
.brand-sub { font-size: 10px; color: var(--sidebar-text); letter-spacing: 1px; text-transform: uppercase; }

.sidebar-nav { flex: 1; padding: 12px; display: flex; flex-direction: column; gap: 2px; overflow-y: auto; }
.nav-section { display: flex; align-items: center; gap: 8px; padding: 16px 8px 8px; font-size: 10px; color: rgba(255,255,255,.3); text-transform: uppercase; letter-spacing: 1.5px; font-weight: 700; }
.nav-item { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: var(--radius-sm); color: var(--sidebar-text); font-size: 13px; font-weight: 500; transition: all var(--transition); text-decoration: none; position: relative; }
.nav-item:hover { background: rgba(255,255,255,.06); color: #fff; }
.nav-item.active { background: rgba(99,102,241,.2); color: #fff; font-weight: 600; }
.nav-item.active::before { content: ''; position: absolute; left: 0; top: 8px; bottom: 8px; width: 3px; background: var(--color-primary); border-radius: 0 3px 3px 0; }
.nav-icon { display: flex; align-items: center; justify-content: center; width: 20px; flex-shrink: 0; }
.nav-label { flex: 1; }
.nav-badge { padding: 1px 7px; border-radius: 10px; font-size: 11px; font-weight: 700; background: var(--color-primary); color: #fff; }
.nav-badge.muted { background: rgba(255,255,255,.1); color: var(--sidebar-text); }
.nav-arrow { opacity: 0.4; }

.sidebar-footer { padding: 16px; border-top: 1px solid var(--sidebar-border); display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.sidebar-user { display: flex; align-items: center; gap: 10px; flex: 1; min-width: 0; }
.user-avatar { width: 34px; height: 34px; border-radius: 50%; background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark)); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 14px; flex-shrink: 0; }
.user-info { display: flex; flex-direction: column; min-width: 0; }
.user-name { font-size: 13px; font-weight: 600; color: #fff; }
.user-role { font-size: 10px; padding: 1px 6px; border-radius: 8px; width: fit-content; font-weight: 600; background: rgba(255,255,255,.1); color: var(--sidebar-text); }
.user-role.role-super { background: rgba(99,102,241,.3); color: #a5b4fc; }
.sidebar-actions { display: flex; gap: 6px; flex-shrink: 0; }
.action-btn { display: flex; align-items: center; justify-content: center; width: 32px; height: 32px; border-radius: 6px; border: 1px solid rgba(255,255,255,.1); background: rgba(255,255,255,.05); color: var(--sidebar-text); cursor: pointer; transition: all var(--transition); font-family: inherit; }
.action-btn:hover { background: rgba(255,255,255,.1); color: #fff; }
.logout-btn:hover { background: rgba(239,68,68,.2); border-color: rgba(239,68,68,.3); color: #f87171; }

/* ---------- 主内容区 ---------- */
.admin-main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.admin-topbar { padding: 16px 28px; border-bottom: 1px solid var(--color-border); background: var(--color-surface); display: flex; align-items: center; justify-content: space-between; position: sticky; top: 0; z-index: 5; }
.topbar-left { display: flex; flex-direction: column; gap: 2px; }
.admin-topbar h1 { font-size: 18px; font-weight: 700; color: var(--color-text); }
.topbar-breadcrumb { font-size: 11px; color: var(--color-text-muted); }
.topbar-actions { display: flex; align-items: center; gap: 12px; }
.topbar-filter { display: flex; align-items: center; gap: 8px; }
.topbar-filter select { padding: 6px 12px; border: 1.5px solid var(--color-border); border-radius: var(--radius-sm); font-size: 12px; background: var(--color-bg); cursor: pointer; font-family: inherit; outline: none; }
.topbar-filter select:focus { border-color: var(--color-primary); }
.filter-clear { font-size: 11px; color: var(--color-primary); }

.admin-content { flex: 1; padding: 24px 28px; overflow-y: auto; }

/* ---------- 统计卡片 ---------- */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 20px; }
.stat-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 20px; display: flex; align-items: center; gap: 16px; transition: all var(--transition); }
.stat-card:hover { box-shadow: var(--shadow-md); transform: translateY(-1px); }
.stat-card .stat-icon { width: 48px; height: 48px; border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.stat-body { display: flex; flex-direction: column; }
.stat-value { font-size: 26px; font-weight: 800; color: var(--color-text); line-height: 1.1; letter-spacing: -0.5px; }
.stat-label { font-size: 12px; color: var(--color-text-muted); margin-top: 2px; font-weight: 500; }

/* ---------- 趋势图 ---------- */
.trend-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 20px 24px; margin-bottom: 20px; }
.trend-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.trend-header h3 { font-size: 15px; font-weight: 700; color: var(--color-text); }
.trend-total { font-size: 12px; color: var(--color-text-muted); }
.trend-chart { display: flex; align-items: flex-end; gap: 12px; height: 140px; padding-top: 20px; }
.trend-bar-wrap { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 6px; height: 100%; justify-content: flex-end; }
.trend-bar { width: 100%; max-width: 40px; border-radius: 4px 4px 0 0; background: linear-gradient(180deg, var(--color-primary) 0%, rgba(99,102,241,.3) 100%); transition: all var(--transition); position: relative; min-height: 4px; display: flex; align-items: flex-start; justify-content: center; padding-top: 4px; }
.trend-bar:hover { opacity: 0.85; }
.trend-bar-val { font-size: 10px; color: #fff; font-weight: 700; }
.trend-bar-label { font-size: 10px; color: var(--color-text-muted); font-weight: 500; }

/* ---------- 表格 ---------- */
.data-table-wrap { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-sm); }
.table-header { padding: 16px 20px; border-bottom: 1px solid var(--color-border); display: flex; align-items: center; justify-content: space-between; }
.table-header h3 { font-size: 14px; font-weight: 700; color: var(--color-text); }
.table-count { font-size: 12px; color: var(--color-text-muted); }
.data-table { width: 100%; border-collapse: collapse; }
.data-table th { background: var(--color-bg-alt); padding: 10px 14px; text-align: left; font-size: 11px; font-weight: 700; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.5px; border-bottom: 2px solid var(--color-border); white-space: nowrap; }
.data-table td { padding: 12px 14px; border-bottom: 1px solid var(--color-border-light); font-size: 13px; color: var(--color-text-secondary); vertical-align: middle; }
.data-table tbody tr { transition: background var(--transition); }
.data-table tbody tr:hover { background: var(--color-surface-hover); }
.content-preview { max-width: 280px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--color-text); }
.action-btns { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.mono { font-family: var(--font-mono); font-size: 12px; }

.user-cell { display: flex; align-items: center; gap: 8px; }
.user-avatar-sm { width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 11px; font-weight: 700; flex-shrink: 0; }
.user-name-sm { font-weight: 600; color: var(--color-text); }
.source-tag { display: inline-block; padding: 2px 8px; border-radius: 4px; background: var(--color-primary-light); color: var(--color-primary); font-size: 11px; font-weight: 600; }
.source-tag.muted { background: var(--color-bg); color: var(--color-text-muted); }
.ip-info { color: var(--color-text-muted); }
.city-info { color: var(--color-primary); font-size: 11px; }
.no-reply { color: var(--color-text-muted); font-size: 12px; }

.status-dot { display: inline-block; width: 6px; height: 6px; border-radius: 50%; margin-right: 4px; vertical-align: middle; }
.status-dot.online { background: var(--color-success); box-shadow: 0 0 0 3px rgba(16,185,129,.2); }
.status-dot.offline { background: var(--color-danger); box-shadow: 0 0 0 3px rgba(239,68,68,.2); }
.status-text { font-size: 12px; color: var(--color-text-secondary); vertical-align: middle; }
.status-badge { display: inline-flex; align-items: center; gap: 4px; padding: 3px 10px; border-radius: 20px; font-size: 11px; font-weight: 700; }
.status-badge.show, .status-badge.active { background: var(--color-success-light); color: #065f46; }
.status-badge.hide, .status-badge.inactive { background: var(--color-danger-light); color: #991b1b; }

/* ============================================================
   回复弹窗
   ============================================================ */
.reply-entry { display: flex; gap: 10px; padding: 10px 12px; border-radius: var(--radius-sm); }
.reply-entry.reply-is-admin { background: var(--color-primary-light); border-left: 3px solid var(--color-primary); }
.reply-entry-avatar { width: 26px; height: 26px; border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 10px; font-weight: 700; flex-shrink: 0; }
.reply-entry-body { flex: 1; min-width: 0; }
.reply-entry-meta { display: flex; align-items: center; gap: 8px; font-size: 12px; margin-bottom: 4px; }
.reply-badge-admin { background: var(--color-primary); color: #fff; padding: 1px 6px; border-radius: 3px; font-size: 10px; font-weight: 700; }
.reply-badge-user { background: var(--color-bg); color: var(--color-text-muted); padding: 1px 6px; border-radius: 3px; font-size: 10px; font-weight: 600; }
.reply-entry-time { color: var(--color-text-muted); font-size: 11px; }
.reply-entry-text { color: var(--color-text-secondary); font-size: 13px; line-height: 1.6; word-break: break-word; }

/* ============================================================
   卡片与提示
   ============================================================ */
.form-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 24px; box-shadow: var(--shadow-sm); margin-bottom: 20px; }
.form-card h3 { font-size: 15px; font-weight: 700; margin-bottom: 16px; color: var(--color-text); display: flex; align-items: center; gap: 8px; }
.form-card h3::before { content: ''; width: 4px; height: 18px; background: var(--color-primary); border-radius: 2px; display: inline-block; }

.tip-box { background: var(--color-info-light); border: 1px solid #bfdbfe; border-radius: var(--radius-md); padding: 16px 20px; margin-bottom: 20px; font-size: 13px; color: #1e40af; line-height: 1.7; }
.tip-box strong { color: #1e3a8a; }

/* 规则卡片 */
.rule-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 16px; }
.rule-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 20px; transition: all var(--transition); }
.rule-card:hover { border-color: var(--color-primary); box-shadow: var(--shadow-md); }
.rule-card .rule-key { display: inline-block; background: var(--color-primary); color: #fff; font-size: 10px; padding: 2px 8px; border-radius: 3px; font-family: var(--font-mono); font-weight: 700; letter-spacing: 0.3px; }
.rule-card .rule-desc { font-size: 12px; color: var(--color-text-muted); margin-bottom: 12px; }
.rule-card .rule-input-row { display: flex; align-items: center; gap: 10px; }
.rule-card .rule-input-row input { width: 100px; padding: 8px 12px; border: 1.5px solid var(--color-border); border-radius: var(--radius-sm); font-size: 15px; font-weight: 700; text-align: center; font-family: var(--font-mono); transition: all var(--transition); outline: none; }
.rule-card .rule-input-row input:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-primary-glow); }
.rule-card .rule-input-row .unit { font-size: 12px; color: var(--color-text-muted); font-weight: 500; }
.rule-card .rule-example { font-size: 11px; color: var(--color-text-muted); margin-top: 10px; padding: 8px 12px; background: var(--color-bg); border-radius: var(--radius-sm); }
.rule-card .rule-example code { background: var(--color-primary-light); padding: 1px 6px; border-radius: 3px; font-size: 11px; color: var(--color-primary); font-family: var(--font-mono); }
.rule-header { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 4px; }
.rule-header h4 { font-size: 14px; color: var(--color-text); margin: 0; font-weight: 700; }

/* 敏感词 */
.words-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 10px; }
.word-tag { display: flex; align-items: center; justify-content: space-between; background: var(--color-surface); border: 1.5px solid var(--color-border); border-radius: var(--radius-sm); padding: 10px 14px; font-size: 13px; transition: all var(--transition); }
.word-tag:hover { border-color: var(--color-danger); background: var(--color-danger-light); }
.word-tag .word-text { color: var(--color-text); word-break: break-all; flex: 1; margin-right: 8px; font-weight: 500; }
.word-tag .word-time { color: var(--color-text-muted); font-size: 10px; margin-right: 8px; white-space: nowrap; }
.word-tag .word-del { background: none; border: none; color: var(--color-text-muted); cursor: pointer; font-size: 16px; padding: 0 4px; line-height: 1; transition: color var(--transition); font-family: inherit; }
.word-tag .word-del:hover { color: var(--color-danger); }

.search-box { display: flex; gap: 10px; flex: 1; max-width: 400px; }
.search-box input { flex: 1; padding: 8px 14px; border: 1.5px solid var(--color-border); border-radius: var(--radius-sm); font-size: 13px; font-family: inherit; outline: none; transition: all var(--transition); }
.search-box input:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-primary-glow); }

/* ============================================================
   模态框
   ============================================================ */
.modal-overlay { display: none; position: fixed; inset: 0; background: rgba(15,23,42,.6); backdrop-filter: blur(4px); z-index: 1000; align-items: center; justify-content: center; }
.modal-overlay.show { display: flex; }
.modal-box { background: var(--color-surface); border-radius: var(--radius-lg); width: 90%; max-width: 520px; box-shadow: var(--shadow-xl); animation: modalIn 0.25s ease; overflow: hidden; }
@keyframes modalIn { from { opacity: 0; transform: scale(.95) translateY(8px); } to { opacity: 1; transform: scale(1) translateY(0); } }
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 20px 24px; border-bottom: 1px solid var(--color-border); }
.modal-header h3 { font-size: 16px; font-weight: 700; color: var(--color-text); }
.modal-close { display: flex; align-items: center; justify-content: center; width: 32px; height: 32px; border-radius: 6px; border: none; background: transparent; color: var(--color-text-muted); cursor: pointer; transition: all var(--transition); }
.modal-close:hover { background: var(--color-bg); color: var(--color-text); }
.modal-box .form-group { padding: 0 24px; margin-top: 20px; }
.modal-box .form-group:first-of-type { margin-top: 0; }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; padding: 16px 24px; border-top: 1px solid var(--color-border); }

/* ============================================================
   Tab 切换
   ============================================================ */
.tabs { display: flex; gap: 0; border-bottom: 2px solid var(--color-border); margin-bottom: 24px; }
.tabs button { padding: 12px 24px; border: none; background: none; color: var(--color-text-muted); font-weight: 600; font-size: 14px; cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -2px; transition: all var(--transition); font-family: inherit; }
.tabs button:hover { color: var(--color-primary); }
.tabs button.active { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.tab-content { display: none; animation: fadeIn .3s ease; }
.tab-content.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }

/* ============================================================
   API 文档样式
   ============================================================ */
.api-info-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.api-info-item { background: var(--color-bg); border-radius: var(--radius-md); padding: 16px; border: 1px solid var(--color-border); }
.api-info-label { display: block; font-size: 10px; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 8px; font-weight: 700; }
.api-info-value { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--color-text); font-weight: 600; }
.api-url-code { background: var(--color-primary-light); color: var(--color-primary); padding: 2px 8px; border-radius: 3px; font-size: 12px; font-family: var(--font-mono); word-break: break-all; }
.copy-btn { background: var(--color-primary-light); border: 1px solid var(--color-border); color: var(--color-primary); padding: 2px 8px; border-radius: 3px; cursor: pointer; font-size: 11px; transition: all var(--transition); font-family: inherit; white-space: nowrap; }
.copy-btn:hover { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

.api-endpoint-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }
.api-endpoint-card { display: flex; align-items: center; gap: 10px; padding: 14px 16px; background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-md); transition: all var(--transition); }
.api-endpoint-card:hover { border-color: var(--color-primary); box-shadow: var(--shadow-sm); }
.endpoint-path { font-family: var(--font-mono); font-size: 12px; color: var(--color-text-secondary); flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.endpoint-desc { font-size: 11px; color: var(--color-text-muted); white-space: nowrap; }

.auth-options { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }
.auth-option { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 16px; }
.auth-option strong { display: block; font-size: 13px; color: var(--color-text); margin-bottom: 10px; }
.auth-option pre { margin: 0; padding: 10px 14px; background: var(--sidebar-bg); border-radius: var(--radius-sm); overflow-x: auto; }
.auth-option pre code { color: #cdd6f4; font-family: var(--font-mono); font-size: 12px; }

.method-badge { display: inline-block; padding: 2px 8px; border-radius: 3px; font-size: 10px; font-weight: 800; text-transform: uppercase; letter-spacing: 0.5px; flex-shrink: 0; }
.method-post { background: #d1fae5; color: #065f46; }
.method-get { background: #dbeafe; color: #1e40af; }

.key-preview { color: var(--color-primary); font-weight: 600; cursor: pointer; }
.key-preview:hover { text-decoration: underline; }
.key-code { font-family: var(--font-mono); font-size: 13px; word-break: break-all; background: rgba(0,0,0,.05); padding: 2px 6px; border-radius: 3px; }
.domain-form { display: none; margin-top: 8px; padding: 12px; background: var(--color-bg); border-radius: var(--radius-sm); border: 1px solid var(--color-border); }
.domain-form textarea { width: 100%; font-size: 12px; padding: 8px; border: 1.5px solid var(--color-border); border-radius: var(--radius-sm); font-family: inherit; resize: vertical; outline: none; background: var(--color-surface); color: var(--color-text); }
.domain-form textarea:focus { border-color: var(--color-primary); box-shadow: 0 0 0 2px var(--color-primary-glow); }
.domain-form-actions { margin-top: 8px; display: flex; gap: 8px; align-items: center; }
.domain-hint { font-size: 11px; color: var(--color-text-muted); }

/* 批量导入 */
.batch-area { background: var(--color-bg); border: 1.5px dashed var(--color-border); border-radius: var(--radius-sm); padding: 16px; margin-top: 12px; }
.batch-area textarea { width: 100%; min-height: 120px; font-size: 13px; padding: 10px; border: 1.5px solid var(--color-border); border-radius: var(--radius-sm); resize: vertical; font-family: inherit; outline: none; transition: border-color var(--transition); }
.batch-area textarea:focus { border-color: var(--color-primary); }
.batch-hint { font-size: 12px; color: var(--color-text-muted); margin-top: 6px; }
.section-divider { border: none; border-top: 1px solid var(--color-border); margin: 20px 0; }

/* 用户管理 */
.role-badge { display: inline-flex; align-items: center; gap: 4px; padding: 3px 10px; border-radius: 20px; font-size: 11px; font-weight: 700; }
.role-badge.role-super { background: #7c3aed; color: #fff; }
.role-badge.role-admin { background: var(--color-bg); color: var(--color-text-secondary); }

/* 侧边栏工具栏 */
.sidebar-toolbar { display: flex; gap: 8px; margin-bottom: 14px; }
.sidebar-toolbar button { flex: 1; display: inline-flex; align-items: center; justify-content: center; height: 32px; border-radius: 6px; border: 1px solid rgba(255,255,255,.15); background: rgba(255,255,255,.08); color: rgba(255,255,255,.75); cursor: pointer; font-size: 12px; font-weight: 600; transition: all .2s; font-family: inherit; }
.sidebar-toolbar button:hover { background: rgba(255,255,255,.15); color: #fff; border-color: rgba(255,255,255,.25); }

#google_translate_element { display: none !important; }
body > .goog-te-banner-frame { display: none !important; }
body { top: 0 !important; }

/* ============================================================
   暗色模式
   ============================================================ */
html[data-theme="dark"] {
    --color-primary: #818cf8;
    --color-primary-hover: #a5b4fc;
    --color-primary-light: rgba(99,102,241,.15);
    --color-primary-glow: rgba(99,102,241,.35);
    --color-primary-dark: #6366f1;
    --color-success: #34d399;
    --color-success-light: rgba(16,185,129,.15);
    --color-warning: #fbbf24;
    --color-warning-light: rgba(245,158,11,.15);
    --color-danger: #f87171;
    --color-danger-light: rgba(239,68,68,.15);
    --color-info: #60a5fa;
    --color-info-light: rgba(59,130,246,.15);
    --color-bg: #0b1120;
    --color-bg-alt: #0f172a;
    --color-surface: #131a2b;
    --color-surface-hover: #1a2332;
    --color-border: #1e2d3d;
    --color-border-light: #1e2d3d;
    --color-text: #e2e8f0;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    --sidebar-bg: #070b15;
    --sidebar-bg-alt: #0f172a;
    --sidebar-text: #64748b;
    --sidebar-text-active: #e2e8f0;
    --sidebar-border: rgba(255,255,255,.04);
}

html[data-theme="dark"] body,
html[data-theme="dark"] .admin-body { background: var(--color-bg); color: var(--color-text); }
html[data-theme="dark"] .admin-layout,
html[data-theme="dark"] .admin-main,
html[data-theme="dark"] .admin-content { background: var(--color-bg); }
html[data-theme="dark"] .admin-topbar { background: var(--color-surface); border-bottom-color: var(--color-border); }
html[data-theme="dark"] .admin-topbar h1 { color: var(--color-text); }
html[data-theme="dark"] .admin-sidebar { background: var(--sidebar-bg); border-right-color: var(--sidebar-border); }

html[data-theme="dark"] .card, html[data-theme="dark"] .form-card,
html[data-theme="dark"] .data-table-wrap, html[data-theme="dark"] .modal-box,
html[data-theme="dark"] .stat-card, html[data-theme="dark"] .trend-card,
html[data-theme="dark"] .rule-card, html[data-theme="dark"] .word-tag,
html[data-theme="dark"] .login-box .login-card { background: var(--color-surface); border-color: var(--color-border); }
html[data-theme="dark"] .card:hover, html[data-theme="dark"] .form-card:hover,
html[data-theme="dark"] .stat-card:hover, html[data-theme="dark"] .rule-card:hover { border-color: var(--color-primary); }
html[data-theme="dark"] .card h2, html[data-theme="dark"] .card h3,
html[data-theme="dark"] .form-card h3, html[data-theme="dark"] .trend-header h3,
html[data-theme="dark"] .modal-header h3, html[data-theme="dark"] .data-table .content-preview,
html[data-theme="dark"] .rule-card h4, html[data-theme="dark"] .login-box h2 { color: var(--color-text); }
html[data-theme="dark"] .data-table th { background: var(--color-bg); border-bottom-color: var(--color-border); }
html[data-theme="dark"] .data-table td { border-bottom-color: var(--color-border-light); }
html[data-theme="dark"] .data-table tbody tr:hover { background: var(--color-surface-hover); }

html[data-theme="dark"] .form-group input,
html[data-theme="dark"] .form-group textarea,
html[data-theme="dark"] .form-group select,
html[data-theme="dark"] .search-box input { background: var(--color-surface); border-color: var(--color-border); color: var(--color-text); }
html[data-theme="dark"] .form-group input:focus,
html[data-theme="dark"] .form-group textarea:focus,
html[data-theme="dark"] .form-group select:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-primary-glow); }
html[data-theme="dark"] .form-group label { color: var(--color-text); }

html[data-theme="dark"] .alert-success { background: var(--color-success-light); border-color: rgba(52,211,153,.25); color: #6ee7b7; }
html[data-theme="dark"] .alert-error { background: var(--color-danger-light); border-color: rgba(248,113,113,.25); color: #fca5a5; }
html[data-theme="dark"] .alert-info { background: var(--color-info-light); border-color: rgba(96,165,250,.25); color: #93c5fd; }
html[data-theme="dark"] .tip-box { background: var(--color-info-light); border-color: rgba(96,165,250,.25); color: #93c5fd; }
html[data-theme="dark"] .tip-box strong { color: #bfdbfe; }

html[data-theme="dark"] .modal-overlay { background: rgba(15,23,42,.85); }
html[data-theme="dark"] .modal-header { border-bottom-color: var(--color-border); }
html[data-theme="dark"] .modal-actions { border-top-color: var(--color-border); }
html[data-theme="dark"] .pagination .page-link { background: var(--color-surface); border-color: var(--color-border); color: var(--color-text-secondary); }
html[data-theme="dark"] .pagination .page-link:hover { background: var(--color-primary-light); border-color: var(--color-primary); color: var(--color-primary); }
html[data-theme="dark"] .pagination .page-link.active { background: var(--color-primary); color: #0f172a; border-color: var(--color-primary); }
html[data-theme="dark"] .empty-state { background: var(--color-surface); border-color: var(--color-border); }
html[data-theme="dark"] .trend-bar { background: linear-gradient(180deg, var(--color-primary) 0%, rgba(99,102,241,.2) 100%); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .admin-sidebar { width: 220px; min-width: 220px; }
}
@media (max-width: 768px) {
    .admin-layout { flex-direction: column; }
    .admin-sidebar { width: 100%; min-width: 100%; max-height: 60px; overflow: hidden; flex-direction: row; align-items: center; padding: 0 16px; }
    .sidebar-brand { padding: 0; border-bottom: none; }
    .brand-sub { display: none; }
    .brand-icon { width: 32px; height: 32px; }
    .sidebar-nav { display: none; }
    .sidebar-footer { display: none; }
    .admin-content { padding: 16px; }
    .admin-topbar { padding: 12px 16px; }
    .admin-topbar h1 { font-size: 16px; }
    .topbar-breadcrumb { display: none; }
    .data-table { display: block; overflow-x: auto; }
    .data-table th, .data-table td { white-space: nowrap; }
    .rule-grid { grid-template-columns: 1fr; }
    .words-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .trend-card { padding: 16px; }
    .container { padding: 12px 10px 40px; }
    .site-header { padding: 28px 12px 20px; }
    .site-header h1 { font-size: 26px; }
    .card { padding: 18px; }
    .message-body { padding-left: 0; margin-top: 8px; }
    .message-meta { padding-left: 0; }
    .admin-reply { margin-left: 0; }
}
@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr; }
    .login-box .login-card { padding: 28px 20px; }
}