/* ===== 乐阅图床 全局样式（无第三方 UI 库，原生响应式） ===== */

/* ---------- 设计令牌 ---------- */
:root{
  --primary:#4f46e5; --primary-d:#4338ca; --primary-l:#eef2ff;
  --primary-grad:linear-gradient(135deg,#4f46e5,#7c3aed);
  --bg:#f6f7fb; --surface:#ffffff; --border:#e8eaf0; --text:#1f2430;
  --muted:#6b7280; --danger:#dc2626; --danger-l:#fef2f2; --success:#16a34a; --warning:#d97706;
  --radius:12px; --radius-sm:9px; --radius-lg:16px;
  --shadow-sm:0 1px 2px rgba(16,24,40,.06);
  --shadow:0 1px 3px rgba(16,24,40,.08),0 1px 2px rgba(16,24,40,.04);
  --shadow-lg:0 14px 38px rgba(16,24,40,.14);
  --nav-h:56px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg); color:var(--text); font-size:14px; line-height:1.6;
  -webkit-text-size-adjust:100%;
}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;vertical-align:middle}
h1,h2,h3{margin:0 0 .5em;line-height:1.3}
h1{font-size:22px}h2{font-size:18px}h3{font-size:15px}
p{margin:0 0 .6em}

/* 容器 */
.container{max-width:1180px;margin:0 auto;padding:0 18px;width:100%}
.muted{color:var(--muted)}
.text-right{text-align:right}
.flex{display:flex}.between{justify-content:space-between}.center{align-items:center}
.gap8{gap:8px}.gap12{gap:12px}.wrap{flex-wrap:wrap}

/* 焦点可见性（键盘可访问） */
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{
  outline:2px solid var(--primary);outline-offset:2px;
}

/* ---------- 顶部导航 ---------- */
.navbar{background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--border);position:sticky;top:0;z-index:60}
.navbar .container{display:flex;align-items:center;height:var(--nav-h);gap:14px}
.brand{font-weight:700;font-size:17px;color:var(--text);display:flex;align-items:center;gap:9px;flex-shrink:0}
.brand:hover{text-decoration:none}
.brand .dot{width:13px;height:13px;border-radius:4px;background:var(--primary-grad);box-shadow:0 1px 3px rgba(79,70,229,.4)}
.nav-collapse{flex:1;display:flex;align-items:center;gap:14px;min-width:0}
.nav-links{display:flex;gap:4px;flex:1;min-width:0}
.nav-links a{padding:7px 12px;border-radius:8px;color:var(--text);white-space:nowrap;font-size:14px}
.nav-links a:hover{background:var(--primary-l);text-decoration:none}
.nav-links a.active{background:var(--primary);color:#fff}
.nav-user{display:flex;align-items:center;gap:10px;flex-shrink:0}
.avatar{width:30px;height:30px;border-radius:50%;background:var(--primary-grad);color:#fff;
  display:inline-flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;flex-shrink:0}
.nav-toggle{display:none;margin-left:auto;width:40px;height:40px;border:1px solid var(--border);
  background:#fff;border-radius:9px;cursor:pointer;align-items:center;justify-content:center;font-size:18px;color:var(--text)}
.nav-toggle:hover{background:var(--bg)}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1px solid var(--border);
  background:var(--surface);color:var(--text);padding:8px 14px;border-radius:9px;cursor:pointer;font-size:14px;
  transition:.15s;line-height:1.2;white-space:nowrap}
.btn:hover{text-decoration:none;border-color:#cbd5e1;background:#fafbff}
.btn-primary{background:var(--primary);border-color:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-d);border-color:var(--primary-d)}
.btn-danger{background:#fff;border-color:var(--danger);color:var(--danger)}
.btn-danger:hover{background:var(--danger-l)}
.btn-sm{padding:6px 11px;font-size:13px}
.btn-ghost{background:transparent;border-color:transparent;color:var(--muted)}
.btn-ghost:hover{background:var(--bg)}
.btn:disabled{opacity:.55;cursor:not-allowed}

/* ---------- 卡片 / 面板 ---------- */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}
.card-pad{padding:20px}
.section{margin:22px 0}
.section-title{font-size:16px;font-weight:700;margin-bottom:12px}
.page-head{margin:6px 0 18px}
.page-head p{margin-bottom:0}

/* ---------- 表单 ---------- */
.form-group{margin-bottom:14px}
label{display:block;font-size:13px;color:var(--muted);margin-bottom:5px}
input[type=text],input[type=email],input[type=password],input[type=number],input[type=url],select,textarea,#uEmail,.search{
  width:100%;padding:10px 12px;border:1px solid #d8dce6;border-radius:10px;font-size:14px;
  background:#fff;color:var(--text);font-family:inherit;transition:border-color .15s,box-shadow .15s;
  -webkit-appearance:none;appearance:none}
input:hover,select:hover,textarea:hover{border-color:#c2c8d4}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-l)}
select{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%236b7280' d='M1 1l5 5 5-5'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 12px center;padding-right:34px}
.form-row{display:flex;gap:14px;flex-wrap:wrap}
.form-row .form-group{flex:1;min-width:200px}
.help{font-size:12px;color:var(--muted);margin-top:4px}

/* ---------- 提示 ---------- */
.alert{padding:11px 14px;border-radius:9px;margin-bottom:14px;font-size:14px}
.alert-error{background:var(--danger-l);border:1px solid #fecaca;color:#b91c1c}
.alert-success{background:#f0fdf4;border:1px solid #bbf7d0;color:#15803d}
.alert-info{background:var(--primary-l);border:1px solid #c7d2fe;color:#3730a3}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:16px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-auto{grid-template-columns:repeat(auto-fill,minmax(190px,1fr))}

/* ---------- 统计 ---------- */
.stat{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}
.stat .num{font-size:24px;font-weight:700;line-height:1.2}
.stat .lbl{color:var(--muted);font-size:13px;margin-top:2px}

/* ---------- 进度条 ---------- */
.progress{height:8px;background:var(--bg);border-radius:99px;overflow:hidden}
.progress > i{display:block;height:100%;background:var(--primary);width:0;transition:width .3s}

/* ===== 文件管理布局 ===== */
.files-layout{display:grid;grid-template-columns:240px 1fr;gap:16px;align-items:start}
.tree{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:12px;max-height:75vh;overflow:auto;box-shadow:var(--shadow-sm)}
.tree-head{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:8px}
.tree-toggle{display:none;align-items:center;gap:4px;background:var(--bg);border:1px solid var(--border);
  border-radius:7px;padding:4px 9px;font-size:12px;color:var(--muted);cursor:pointer}
.tree-toggle:hover{background:var(--primary-l)}
.tree-body{display:block}
.tree ul{list-style:none;margin:0;padding-left:14px}
.tree > .tree-body > ul{padding-left:0}
.tree li{margin:2px 0}
.tree .node{display:flex;align-items:center;gap:6px;padding:5px 8px;border-radius:7px;cursor:pointer}
.tree .node:hover{background:var(--primary-l)}
.tree .node.active{background:var(--primary);color:#fff}
.tree .node .name{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tree .tw{font-size:11px;color:var(--muted);cursor:pointer;padding:0 4px}
.tree .node.active .tw{color:#fff}

/* 文件卡片网格 */
.files-toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-bottom:14px}
.files-toolbar .search{flex:1;min-width:180px}
.file-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:14px}
.file-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;position:relative;box-shadow:var(--shadow-sm);transition:box-shadow .15s,transform .15s}
.file-card:hover{box-shadow:var(--shadow);transform:translateY(-1px)}
.file-thumb{aspect-ratio:4/3;background:#f1f3f9;display:flex;align-items:center;justify-content:center;overflow:hidden;position:relative}
.file-thumb img{width:100%;height:100%;object-fit:cover;display:block}
.file-thumb .fmt-btn{position:absolute;top:8px;right:8px}
.file-meta{padding:9px 11px}
.file-name{font-size:13px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.file-sub{font-size:12px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.file-actions{display:flex;gap:6px;padding:0 11px 11px;flex-wrap:wrap}
.file-actions .btn{flex:1;min-width:0}

/* 格式按钮（卡片右上角） */
.fmt-btn{width:30px;height:30px;border-radius:8px;background:rgba(17,24,39,.62);
  color:#fff;border:none;cursor:pointer;font-size:11px;font-weight:700;display:flex;align-items:center;justify-content:center;backdrop-filter:blur(2px);z-index:5}
.fmt-btn:hover{background:rgba(17,24,39,.8)}
.fmt-pop{position:fixed;background:#fff;border:1px solid var(--border);border-radius:10px;
  box-shadow:var(--shadow-lg);padding:10px;display:none;z-index:1000;width:190px}
.fmt-pop.open{display:block}
@media (max-width:560px){.fmt-pop{width:172px}}
.fmt-item{display:flex;align-items:center;gap:9px;padding:5px;border-radius:7px;margin-bottom:5px;cursor:pointer}
.fmt-item:last-child{margin-bottom:0}
.fmt-item:hover{background:var(--bg)}
.fmt-item .mini{width:38px;height:38px;border-radius:6px;background:#f1f3f9;object-fit:cover;flex-shrink:0}
.fmt-item .mini.skeleton{background:linear-gradient(90deg,#eef0f5 25%,#e2e6ee 37%,#eef0f5 63%);background-size:400% 100%;animation:sk 1.3s infinite}
@keyframes sk{0%{background-position:100% 0}100%{background-position:-100% 0}}
.fmt-item .info{flex:1;min-width:0}
.fmt-item .fmt-name{font-size:12px;font-weight:600}
.fmt-item .fmt-act{font-size:11px;color:var(--muted)}
.fmt-item .fmt-act.gen{color:var(--primary)}

/* 骨架屏（懒加载占位） */
.lazy-skeleton{width:100%;height:100%;background:linear-gradient(90deg,#eef0f5 25%,#e2e6ee 37%,#eef0f5 63%);background-size:400% 100%;animation:sk 1.3s infinite}

/* ---------- 分页 ---------- */
.pager{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:18px;justify-content:center}
.pager a,.pager span{padding:6px 11px;border:1px solid var(--border);border-radius:7px;background:#fff;color:var(--text);cursor:pointer}
.pager a:hover{text-decoration:none;border-color:var(--primary);color:var(--primary)}
.pager .cur{background:var(--primary);color:#fff;border-color:var(--primary)}
.pager .dots{border:none;background:none;cursor:default}
.pager .size-sel{margin-left:auto}

/* ---------- 模态框 ---------- */
.modal-mask{position:fixed;inset:0;background:rgba(15,23,42,.5);display:none;align-items:center;justify-content:center;z-index:100;padding:16px}
.modal-mask.open{display:flex}
.modal{background:#fff;border-radius:14px;width:100%;max-width:480px;box-shadow:var(--shadow-lg);overflow:hidden;animation:pop .18s ease}
.modal-lg{width:100%;max-width:960px}
.modal-lg .modal-body{max-height:90vh;padding:14px}
@keyframes pop{from{transform:translateY(8px);opacity:.6}to{transform:translateY(0);opacity:1}}
.modal-head{padding:14px 18px;border-bottom:1px solid var(--border);font-weight:700}
.modal-body{padding:18px;max-height:70vh;overflow:auto}
.modal-foot{padding:12px 18px;border-top:1px solid var(--border);display:flex;justify-content:flex-end;gap:8px;flex-wrap:wrap}
.modal-foot .btn{flex:0 0 auto}
/* 弹窗内表单控件样式（弹窗在 body 下，不继承 .admin-content 规则） */
.modal-body input[type=text],.modal-body input[type=email],.modal-body input[type=password],
.modal-body input[type=number],.modal-body textarea,.modal-body select{
  width:100%;padding:10px 12px;border:1px solid #d8dce6;border-radius:10px;font-size:14px;
  background:#fff;color:var(--text);font-family:inherit;transition:border-color .15s,box-shadow .15s;
  -webkit-appearance:none;appearance:none}
.modal-body input:hover,.modal-body select:hover,.modal-body textarea:hover{border-color:#c2c8d4}
.modal-body input:focus,.modal-body select:focus,.modal-body textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-l)}
.modal-body select{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%236b7280' d='M1 1l5 5 5-5'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 12px center;padding-right:34px}
.modal-body .form-group{margin-bottom:14px}
.modal-body label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px;font-weight:600}

/* ---------- Toast ---------- */
.toast-wrap{position:fixed;top:18px;left:50%;transform:translateX(-50%);z-index:200;display:flex;flex-direction:column;gap:8px;align-items:center;padding:0 12px;width:max-content;max-width:92vw}
.toast{background:#111827;color:#fff;padding:9px 16px;border-radius:9px;font-size:13px;box-shadow:var(--shadow-lg);opacity:0;transform:translateY(-8px);transition:.2s;max-width:92vw;text-align:center}
.toast.show{opacity:1;transform:translateY(0)}
.toast.ok{background:#16a34a}.toast.err{background:#dc2626}

/* ---------- 表格 ---------- */
.table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.table th,.table td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--border);font-size:13px}
.table th{background:var(--bg);font-weight:600;color:var(--muted);white-space:nowrap}
.table tr:last-child td{border-bottom:none}
.table tbody tr:hover{background:var(--primary-l)}
.badge{display:inline-block;padding:2px 8px;border-radius:99px;font-size:12px;background:var(--primary-l);color:var(--primary-d);white-space:nowrap}
.badge.gray{background:#f1f3f9;color:var(--muted)}
.badge.green{background:#dcfce7;color:#15803d}
.badge.red{background:#fee2e2;color:#b91c1c}

/* ---------- 上传区 ---------- */
.dropzone{border:2px dashed var(--border);border-radius:14px;padding:34px;text-align:center;color:var(--muted);background:#fff;cursor:pointer;transition:.15s}
.dropzone:hover{border-color:#c7cdf5}
.dropzone.drag{border-color:var(--primary);background:var(--primary-l)}
.upload-item{border:1px solid var(--border);border-radius:10px;padding:11px;margin-bottom:10px;background:#fff}
.upload-item .top{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:6px}
.upload-item .fname{font-size:13px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.upload-item .pct{font-size:12px;color:var(--muted);flex-shrink:0}
.url-box{margin-top:8px;font-size:12px}
.url-box .row{display:flex;gap:6px;align-items:center;margin:3px 0}
.url-box code{flex:1;background:var(--bg);padding:4px 8px;border-radius:6px;font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.empty{text-align:center;color:var(--muted);padding:50px 16px}

/* 防盗链列表 */
.al-item{display:flex;align-items:flex-start;gap:14px;padding:14px 16px;border:1px solid var(--border);border-radius:12px;margin-bottom:12px;background:var(--surface)}
.al-item:last-child{margin-bottom:0}
.al-main{flex:1;min-width:0}
.al-title{font-weight:600;margin-bottom:8px;word-break:break-word}
.al-domains{display:flex;flex-wrap:wrap;gap:6px}
.al-ops{display:flex;gap:8px;flex-shrink:0}

/* ---------- 安装页 ---------- */
.install-body{background:var(--primary-grad);min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}
.install-card{background:#fff;border-radius:16px;padding:30px;width:100%;max-width:520px;box-shadow:var(--shadow-lg)}
.install-card h1{font-size:22px}
.install-card h3{margin-top:18px;color:var(--primary-d);font-size:15px}

/* ---------- 首页 Hero ---------- */
.hero{background:var(--primary-grad);color:#fff;border-radius:var(--radius-lg);padding:38px 32px;margin-bottom:10px;
  box-shadow:var(--shadow-lg);position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-60px;top:-60px;width:200px;height:200px;border-radius:50%;
  background:rgba(255,255,255,.12)}
.hero h1{color:#fff;font-size:30px;margin-bottom:10px}
.hero p{color:rgba(255,255,255,.92);font-size:16px;max-width:560px;position:relative;z-index:1}
.hero .hero-actions{margin-top:20px;position:relative;z-index:1}
.hero .btn{background:#fff;color:var(--primary);border-color:#fff;font-weight:600}
.hero .btn:hover{background:#f1f5f9;border-color:#f1f5f9}
.hero .btn:not(.btn-primary){background:rgba(255,255,255,.16);color:#fff;border-color:rgba(255,255,255,.45)}
.hero .btn:not(.btn-primary):hover{background:rgba(255,255,255,.26)}

/* ---------- 工具类 ---------- */
.hidden{display:none!important}
.nowrap{white-space:nowrap}
.scroll-x{overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:thin}
.scroll-x::-webkit-scrollbar{height:8px}
.scroll-x::-webkit-scrollbar-thumb{background:#d1d5db;border-radius:4px}

/* ============================================================
   响应式断点
   - 980px：宽桌面网格收缩
   - 820px：开启移动端导航 + 文件布局单列 + 分组树折叠
   - 560px：手机竖屏，表单/工具栏堆叠、间距收敛
   - 400px：超小屏微调
   ============================================================ */

/* 平板：4 列统计变 2 列 */
@media (max-width:980px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
}

/* 移动端：导航折叠 + 文件单列 + 分组树可折叠 */
@media (max-width:820px){
  .nav-toggle{display:inline-flex}
  .nav-collapse{
    display:none;position:absolute;top:100%;left:0;right:0;
    background:var(--surface);border-bottom:1px solid var(--border);
    box-shadow:var(--shadow-lg);flex-direction:column;align-items:stretch;
    gap:6px;padding:10px 16px;
  }
  .nav-collapse.open{display:flex}
  .nav-links{flex-direction:column;align-items:stretch;gap:2px;flex:0 0 auto}
  .nav-links a{padding:10px 12px}
  .nav-user{justify-content:space-between;padding-top:8px;border-top:1px solid var(--border)}

  .files-layout{grid-template-columns:1fr;gap:12px}
  .tree{max-height:none}
  .tree-toggle{display:inline-flex}
  .tree-body{display:none}
  .tree.show-tree .tree-body{display:block}

  .grid-3{grid-template-columns:repeat(2,1fr)}
}

/* 手机竖屏 */
@media (max-width:560px){
  .container{padding:0 14px}
  h1{font-size:20px}h2{font-size:17px}
  .section{margin:16px 0}
  .card-pad{padding:16px}
  .hero{padding:28px 20px;border-radius:14px}
  .hero h1{font-size:25px}

  .grid-3,.grid-4{grid-template-columns:1fr}
  .grid{gap:12px}

  .form-row{gap:0}
  .form-row .form-group{min-width:100%}

  .files-toolbar{gap:8px}
  .files-toolbar .search{flex-basis:100%}
  .files-toolbar select,.files-toolbar .btn{flex:1;min-width:0}

  .file-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:10px}
  .file-actions .btn{font-size:12px;padding:5px 6px}

  .pager{justify-content:center}
  .pager .size-sel{margin-left:0;width:100%;order:5;display:flex;justify-content:center;margin-top:6px}
  .pager .size-sel select{width:auto}

  .modal-foot .btn{flex:1}
  .upload-item .top{flex-wrap:wrap}
  .url-box .row{flex-wrap:wrap}
  .url-box code{width:100%;flex-basis:100%}
}

/* 超小屏 */
@media (max-width:400px){
  .brand{font-size:15px}
  .file-grid{grid-template-columns:repeat(auto-fill,minmax(120px,1fr))}
  .hero .hero-actions .btn{display:flex;width:100%}
}

/* ===== 后台布局：顶栏 + 左侧菜单 + 右侧主体 ===== */
.admin-body{background:var(--bg)}
.admin-topbar{position:sticky;top:0;z-index:50;height:var(--nav-h);background:var(--surface);
  border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 18px;gap:12px}
.atb-left{display:flex;align-items:center;gap:12px;min-width:0}
.atb-right{display:flex;align-items:center;gap:10px}
.atb-tag{font-size:12px;color:var(--primary);background:var(--primary-l);padding:3px 9px;border-radius:99px;font-weight:600;white-space:nowrap}
.atb-user{font-size:13px;max-width:150px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sidebar-toggle{display:none;background:var(--surface);border:1px solid var(--border);border-radius:8px;
  width:36px;height:36px;font-size:16px;line-height:1;cursor:pointer;color:var(--text)}
.sidebar-toggle:hover{background:var(--bg)}

.admin-shell{display:flex;align-items:stretch;min-height:calc(100vh - var(--nav-h))}
.admin-sidebar{width:236px;flex:0 0 236px;background:var(--surface);border-right:1px solid var(--border);
  display:flex;flex-direction:column;padding:14px 12px;position:sticky;top:var(--nav-h);
  height:calc(100vh - var(--nav-h));overflow:auto}
.admin-menu{display:flex;flex-direction:column;gap:4px;flex:1}
.am-item{display:flex;align-items:center;gap:11px;padding:10px 12px;border-radius:10px;color:var(--text);
  font-size:14px;font-weight:500;cursor:pointer}
.am-item:hover{background:var(--bg);text-decoration:none}
.am-item.active{background:var(--primary-l);color:var(--primary);font-weight:600}
.am-ico{width:20px;flex:0 0 20px;text-align:center;font-size:15px}
.am-txt{white-space:nowrap}
.admin-side-foot{margin-top:10px;padding-top:10px;border-top:1px solid var(--border)}
.am-foot{color:var(--muted)}
.admin-main{flex:1;min-width:0;padding:22px 24px 60px}
.admin-content{max-width:1200px;margin:0 auto}
.sidebar-backdrop{display:none}

@media (max-width:980px){
  .atb-user{display:none}
}
@media (max-width:820px){
  .sidebar-toggle{display:inline-flex;align-items:center;justify-content:center}
  .atb-tag{display:none}
  .admin-sidebar{position:fixed;top:var(--nav-h);left:0;bottom:0;z-index:60;
    transform:translateX(-100%);transition:transform .22s ease;box-shadow:var(--shadow-lg)}
  .admin-sidebar.open{transform:translateX(0)}
  .sidebar-backdrop{display:block;position:fixed;inset:var(--nav-h) 0 0 0;background:rgba(15,23,42,.42);
    z-index:55;opacity:0;visibility:hidden;transition:opacity .2s ease}
  .sidebar-backdrop.open{opacity:1;visibility:visible}
  .admin-main{padding:16px 14px 50px}
}
@media (max-width:560px){
  .admin-topbar{padding:0 12px}
  .am-item{font-size:14px;padding:11px 12px}
}

/* ===== 后台主体内容样式优化 ===== */
.admin-content{font-size:14px;line-height:1.65;color:var(--text)}
.admin-content .section:first-child{margin-top:2px}
.admin-content h2{font-size:19px;font-weight:700;color:#111827;letter-spacing:-.01em}
.admin-content h3{font-size:15px;font-weight:700;color:var(--text);margin:24px 0 12px;
  padding-left:10px;border-left:3px solid var(--primary);line-height:1.3}
.admin-content .section > h2 + p{margin-top:-4px}

/* 统计卡片 */
.admin-content .stat{position:relative;overflow:hidden;padding:18px 18px 16px;transition:.18s}
.admin-content .stat::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--primary-grad)}
.admin-content .stat:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.admin-content .stat .num{font-size:26px;font-weight:800;color:var(--text);letter-spacing:-.02em}
.admin-content .stat .lbl{margin-top:4px;font-size:12.5px}

/* 表单 */
.admin-content .card-pad{padding:22px 24px}
.admin-content form.card-pad{max-width:880px}
.admin-content .form-group{margin-bottom:16px}
.admin-content label{font-size:13px;font-weight:600;color:#4b5563;margin-bottom:6px}
.admin-content .help{font-size:12px;color:var(--muted);margin-top:5px;line-height:1.5}
.admin-content input[type=text],.admin-content input[type=email],
.admin-content input[type=password],.admin-content input[type=number],
.admin-content input[type=url],.admin-content textarea{
  padding:10px 12px;font-size:14px;border-radius:10px;transition:.15s}
.admin-content select{padding:10px 34px 10px 12px;font-size:14px;border-radius:10px;transition:.15s}
.admin-content textarea{min-height:64px;resize:vertical;line-height:1.55}
.admin-content .form-row{gap:16px}
.admin-content .form-group label.flex{font-weight:600;color:#374151;gap:8px;cursor:pointer;align-items:center}
.admin-content .form-group label.flex input[type=checkbox]{width:16px;height:16px;accent-color:var(--primary);cursor:pointer;margin:0}

/* 设置页底部操作区 */
.admin-content form .flex.gap12{margin-top:20px;padding-top:18px;border-top:1px solid var(--border);flex-wrap:wrap;align-items:center}
.admin-content form .flex.gap12 .btn-primary{font-weight:600;padding:10px 22px}
#smtpTestTo,input{width:240px;border:1px solid var(--border);border-radius:10px;padding:9px 12px;font-size:14px;font-family:inherit;
  height:38px;transition:.15s}
#smtpTestTo:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-l)}

/* 卡片链接（概览入口） */
.admin-content a.card{cursor:pointer;transition:.18s}
.admin-content a.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);text-decoration:none}
.admin-content a.card h3{margin:0 0 6px;color:var(--text);border:0;padding:0;font-size:15px}
.admin-content a.card p{margin:0}

/* 工具栏 */
.admin-content .files-toolbar{background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:10px 12px}
.admin-content .files-toolbar .search,.admin-content .files-toolbar input[type=text]{flex:1;min-width:180px}
.admin-content .files-toolbar select,.admin-content .files-toolbar .btn{height:38px}
.admin-content .scroll-x{margin-top:2px}

/* 表格 */
.admin-content .table{border-radius:12px}
.admin-content .table th{font-size:12.5px;letter-spacing:.02em}
.admin-content .table td{font-size:13.5px}
.admin-content .table .nowrap{white-space:nowrap}

/* 图片管理：缩略图网格 + 详情展开 */
.img-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px;margin-top:14px}
.img-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;overflow:hidden;
  display:flex;flex-direction:column;transition:.18s}
.img-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}
.img-thumb{aspect-ratio:4/3;background:var(--bg);overflow:hidden;position:relative;cursor:pointer}
.img-thumb img{width:100%;height:100%;object-fit:cover;display:block}
.img-actions{position:absolute;top:8px;right:8px;display:flex;gap:6px;z-index:2;
  opacity:0;transform:translateY(-2px);transition:.15s}
.img-card:hover .img-actions,.img-actions:focus-within{opacity:1;transform:translateY(0)}
.img-fab{width:30px;height:30px;padding:0;border:none;border-radius:50%;
  background:rgba(17,24,39,.62);color:#fff;font-size:14px;line-height:30px;text-align:center;cursor:pointer;
  -webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);box-shadow:0 1px 4px rgba(0,0,0,.3);
  display:flex;align-items:center;justify-content:center}
.img-fab:hover{background:rgba(17,24,39,.86);transform:scale(1.06)}
.img-cap{font-size:12px;color:var(--muted);padding:8px 10px 11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

.img-dl{margin:0;display:grid;gap:9px}
.img-dl > div{display:grid;grid-template-columns:74px 1fr;gap:8px;align-items:baseline}
.img-dl dt{color:var(--muted);font-size:12.5px;margin:0}
.img-dl dd{margin:0;font-size:13px;word-break:break-all;line-height:1.5}
.img-acts{display:flex;gap:8px;margin-top:12px}
.img-acts .btn{flex:1}

/* 提示 */
.admin-content .alert{margin:0 0 16px;border-radius:10px}

/* 主体响应式 */
@media (max-width:980px){
  .admin-content .grid-4{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:820px){
  .admin-main{padding:18px 16px 48px}
  .admin-content h2{font-size:18px}
  .admin-content .card-pad{padding:18px 16px}
  .admin-content .form-row .form-group{min-width:160px}
  .admin-content .grid-3{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:560px){
  .admin-main{padding:14px 12px 40px}
  .admin-content h2{font-size:17px}
  .admin-content h3{font-size:14.5px;margin:18px 0 10px}
  .admin-content .card-pad{padding:16px 14px}
  .admin-content .form-row .form-group{min-width:100%}
  .admin-content .grid-4,.admin-content .grid-3{grid-template-columns:1fr}
  .admin-content .stat .num{font-size:23px}
  .img-grid{grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:10px}
  .img-thumb{aspect-ratio:1/1}
  .admin-content .files-toolbar{flex-direction:column;align-items:stretch;gap:8px}
  .admin-content .files-toolbar .search,.admin-content .files-toolbar input[type=text],
  .admin-content .files-toolbar select,.admin-content .files-toolbar .btn{width:100%;flex:1 1 auto}
  #smtpTestTo{width:100%}
  .admin-content form .flex.gap12 .btn{flex:1 1 auto}
}