/* ============================================================
   书海小说CMS 前台样式
   设计：暖纸色阅读基调 + 蓝色主操作色；支持 [data-theme=dark] 夜间模式
   ============================================================ */
:root{
  --primary:#3a6ff7;
  --primary-dark:#2b55c9;
  --accent:#ff8a3d;
  --bg:#f5f6fa;
  --card:#ffffff;
  --text:#22252b;
  --text-2:#6b7280;
  --text-3:#9ca3af;
  --border:#e8eaf0;
  --shadow:0 2px 12px rgba(30,40,90,.08);
  --shadow-h:0 8px 24px rgba(30,40,90,.14);
  --radius:10px;
  --reader-bg:#f7f1e3;      /* 阅读器羊皮纸 */
  --reader-text:#2b2620;
  --header-h:60px;
  --maxw:1200px;
}
[data-theme="dark"]{
  --bg:#14161c; --card:#1d2028; --text:#d8dce5; --text-2:#98a0af; --text-3:#6b7280;
  --border:#2c303c; --shadow:0 2px 12px rgba(0,0,0,.4); --shadow-h:0 8px 24px rgba(0,0,0,.5);
  --reader-bg:#1a1c22; --reader-text:#c9cdd6;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--text);line-height:1.6;font-size:15px;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
button{font-family:inherit;cursor:pointer;border:none;outline:none}
input,textarea,select{font-family:inherit;outline:none}
.container{max-width:var(--maxw);margin:0 auto;padding:0 16px}

/* ---------- 顶部导航 ---------- */
.header{position:sticky;top:0;z-index:100;background:var(--card);border-bottom:1px solid var(--border);box-shadow:var(--shadow)}
.header .bar{height:var(--header-h);display:flex;align-items:center;gap:24px;max-width:var(--maxw);margin:0 auto;padding:0 16px}
.logo{font-size:22px;font-weight:800;color:var(--primary);white-space:nowrap;display:flex;align-items:center;gap:8px}
.logo .mark{width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,var(--primary),#7b5cff);color:#fff;display:grid;place-items:center;font-size:18px}
.nav{display:flex;gap:4px}
.nav a{padding:8px 14px;border-radius:8px;color:var(--text-2);font-weight:500;transition:.2s}
.nav a:hover{color:var(--primary);background:rgba(58,111,247,.08)}
.nav a.active{color:var(--primary);background:rgba(58,111,247,.12)}
.search-box{flex:1;max-width:380px;position:relative;margin-left:auto}
.search-box input{width:100%;height:38px;border:1px solid var(--border);border-radius:19px;padding:0 44px 0 18px;background:var(--bg);color:var(--text)}
.search-box input:focus{border-color:var(--primary)}
.search-box .sbtn{position:absolute;right:4px;top:4px;width:30px;height:30px;border-radius:50%;background:var(--primary);color:#fff;display:grid;place-items:center}
.header-right{display:flex;align-items:center;gap:10px;margin-left:8px}
.icon-btn{position:relative;width:38px;height:38px;border-radius:50%;display:grid;place-items:center;color:var(--text-2);font-size:18px;background:transparent}
.icon-btn:hover{background:var(--bg);color:var(--primary)}
.avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#ff8a3d,#ff5e7e);color:#fff;display:grid;place-items:center;font-weight:700;cursor:pointer}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 20px;border-radius:8px;font-size:14px;font-weight:600;transition:.2s;border:1px solid transparent;white-space:nowrap}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark)}
.btn-outline{border-color:var(--border);color:var(--text);background:var(--card)}
.btn-outline:hover{border-color:var(--primary);color:var(--primary)}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{filter:brightness(1.05)}
.btn-sm{padding:5px 12px;font-size:13px}
.btn-block{width:100%}
.btn:disabled{opacity:.5;cursor:not-allowed}
.badge{display:inline-block;padding:2px 8px;border-radius:6px;font-size:12px;font-weight:600}
.badge-vip{background:linear-gradient(135deg,#f7b733,#fc4a1a);color:#fff}
.badge-free{background:#e6f7ee;color:#16a34a}
.badge-gray{background:var(--bg);color:var(--text-2)}

/* ---------- 用户下拉 ---------- */
.user-menu{position:relative}
.user-menu .menu{position:absolute;right:0;top:48px;background:var(--card);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow-h);min-width:170px;padding:6px;display:none;z-index:200}
.user-menu.open .menu{display:block}
.user-menu .menu a{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:8px;color:var(--text);font-size:14px}
.user-menu .menu a:hover{background:var(--bg);color:var(--primary)}
.user-menu .menu .split{height:1px;background:var(--border);margin:4px 0}

/* ---------- 区块 ---------- */
.section{margin:28px 0}
.section-head{display:flex;align-items:center;margin-bottom:16px}
.section-head h2{font-size:20px;font-weight:800;position:relative;padding-left:14px}
.section-head h2::before{content:"";position:absolute;left:0;top:3px;bottom:3px;width:4px;border-radius:2px;background:linear-gradient(var(--primary),#7b5cff)}
.section-head .more{margin-left:auto;color:var(--text-2);font-size:13px}
.section-head .more:hover{color:var(--primary)}

/* ---------- 书籍卡片 ---------- */
.grid{display:grid;gap:18px}
.grid-books{grid-template-columns:repeat(6,1fr)}
.grid-5{grid-template-columns:repeat(5,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.book-card{background:var(--card);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:.25s;cursor:pointer}
.book-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-h)}
.book-cover{position:relative;aspect-ratio:3/4;display:flex;align-items:center;justify-content:center;color:rgba(255,255,255,.92);font-size:16px;font-weight:700;text-align:center;padding:10px;overflow:hidden}
.book-cover .corner{position:absolute;top:0;left:0;background:rgba(0,0,0,.45);color:#fff;font-size:11px;padding:2px 8px;border-bottom-right-radius:8px}
.book-cover .finish{position:absolute;top:8px;right:0;background:rgba(0,0,0,.55);color:#fff;font-size:11px;padding:2px 8px;border-top-left-radius:6px;border-bottom-left-radius:6px}
.book-info{padding:10px}
.book-title{font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.book-author{font-size:12px;color:var(--text-3);margin-top:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.book-meta{display:flex;gap:8px;margin-top:6px;font-size:12px;color:var(--text-3)}

/* 横排列表项（最新更新等） */
.list-item{display:flex;gap:14px;padding:12px;border-bottom:1px solid var(--border);align-items:center;cursor:pointer}
.list-item:hover{background:var(--bg)}
.list-item .mini-cover{width:44px;height:58px;border-radius:5px;flex:none;display:grid;place-items:center;color:#fff;font-size:11px;text-align:center;padding:4px}
.list-item .li-main{flex:1;min-width:0}
.list-item .li-title{font-weight:600;font-size:15px}
.list-item .li-sub{font-size:13px;color:var(--text-2);margin-top:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* 排行榜 */
.rank-list{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.rank-item{display:flex;align-items:center;gap:14px;padding:12px 16px;border-bottom:1px solid var(--border);cursor:pointer}
.rank-item:hover{background:var(--bg)}
.rank-num{width:26px;height:26px;border-radius:6px;display:grid;place-items:center;font-weight:800;font-size:14px;flex:none;background:var(--bg);color:var(--text-2)}
.rank-item:nth-child(1) .rank-num{background:#ff4d4f;color:#fff}
.rank-item:nth-child(2) .rank-num{background:#ff7a45;color:#fff}
.rank-item:nth-child(3) .rank-num{background:#ffa940;color:#fff}
.rank-item .r-cover{width:40px;height:54px;border-radius:4px;flex:none;display:grid;place-items:center;color:#fff;font-size:10px;text-align:center;padding:3px}
.rank-item .r-main{flex:1;min-width:0}
.rank-item .r-title{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rank-item .r-author{font-size:12px;color:var(--text-3)}
.rank-item .r-score{font-size:13px;color:var(--accent);font-weight:700}

/* 标签筛选 */
.chips{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:18px}
.chip{padding:6px 16px;border-radius:16px;background:var(--card);border:1px solid var(--border);font-size:14px;color:var(--text-2);cursor:pointer;transition:.2s}
.chip:hover{border-color:var(--primary);color:var(--primary)}
.chip.active{background:var(--primary);color:#fff;border-color:var(--primary)}

/* 面包屑/卡片容器 */
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}
.crumbs{font-size:13px;color:var(--text-3);margin:16px 0}
.crumbs a:hover{color:var(--primary)}

/* 详情页 */
.detail-top{display:flex;gap:28px}
.detail-cover{width:180px;height:240px;border-radius:12px;flex:none;display:flex;align-items:center;justify-content:center;color:#fff;font-size:20px;font-weight:800;text-align:center;padding:16px;box-shadow:var(--shadow-h)}
.detail-info{flex:1;min-width:0}
.detail-info h1{font-size:26px;font-weight:800;margin-bottom:10px}
.detail-info .author-line{color:var(--text-2);margin-bottom:10px;display:flex;flex-wrap:wrap;gap:6px 16px;align-items:center}
.tag-pill{display:inline-block;padding:2px 10px;background:rgba(58,111,247,.1);color:var(--primary);border-radius:12px;font-size:12px;margin-right:6px}
.stat-row{display:flex;gap:26px;margin:16px 0;color:var(--text-2);font-size:14px}
.stat-row b{display:block;font-size:20px;color:var(--text);font-weight:800}
.detail-actions{display:flex;gap:12px;margin-top:18px}
.intro-box{margin-top:20px;color:var(--text-2);font-size:14px;background:var(--bg);border-radius:8px;padding:14px;line-height:1.8}
.chapter-list{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid var(--border);border-left:1px solid var(--border)}
.chapter-cell{padding:12px 14px;border-right:1px solid var(--border);border-bottom:1px solid var(--border);font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;cursor:pointer}
.chapter-cell:hover{color:var(--primary);background:var(--bg)}
.chapter-cell.vip{color:var(--accent)}
.chapter-cell .lock{font-size:12px;margin-right:4px}

/* 评论 */
.comment{display:flex;gap:12px;padding:16px 0;border-bottom:1px solid var(--border)}
.comment .c-avatar{width:40px;height:40px;border-radius:50%;flex:none;display:grid;place-items:center;color:#fff;font-weight:700;background:linear-gradient(135deg,#3a6ff7,#7b5cff)}
.comment .c-body{flex:1}
.comment .c-name{font-weight:600;font-size:14px}
.comment .c-time{font-size:12px;color:var(--text-3);margin-left:10px}
.comment .c-text{margin:6px 0;font-size:14px}
.comment .c-ops{font-size:12px;color:var(--text-3);display:flex;gap:16px}
.comment .c-ops span{cursor:pointer}
.comment .c-ops span:hover{color:var(--primary)}
.reply-box{background:var(--bg);border-radius:8px;padding:10px 14px;margin-top:8px;font-size:13px}

/* 表单 */
.form-row{margin-bottom:16px}
.form-row label{display:block;font-size:14px;font-weight:600;margin-bottom:6px}
.input{width:100%;height:42px;border:1px solid var(--border);border-radius:8px;padding:0 14px;background:var(--card);color:var(--text);font-size:14px}
.input:focus,textarea.input:focus{border-color:var(--primary)}
textarea.input{height:auto;padding:10px 14px;resize:vertical}
.tabs{display:flex;border-bottom:1px solid var(--border);margin-bottom:20px}
.tabs .tab{padding:12px 22px;font-weight:600;color:var(--text-2);cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-1px}
.tabs .tab.active{color:var(--primary);border-color:var(--primary)}

/* 弹窗 */
.modal-mask{position:fixed;inset:0;background:rgba(20,22,30,.55);z-index:1000;display:none;align-items:center;justify-content:center;padding:20px}
.modal-mask.show{display:flex}
.modal{background:var(--card);border-radius:14px;width:100%;max-width:400px;padding:28px;box-shadow:var(--shadow-h)}
.modal h3{font-size:20px;margin-bottom:20px;text-align:center}
.modal .switch{text-align:center;margin-top:14px;font-size:13px;color:var(--text-2)}
.modal .switch a{color:var(--primary)}

/* ===== 支付方式选择弹窗 ===== */
.pay-mask{z-index:1100;animation:pmMaskIn .18s ease}
.pay-modal{max-width:420px;padding:22px 24px 24px;animation:pmPop .22s ease}
@keyframes pmMaskIn{from{opacity:0}to{opacity:1}}
@keyframes pmPop{from{opacity:0;transform:translateY(18px) scale(.97)}to{opacity:1;transform:none}}
.pm-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.pm-title{font-size:18px;font-weight:800}
.pm-close{width:32px;height:32px;border-radius:50%;border:none;background:var(--bg);color:var(--text-2);font-size:20px;line-height:1;cursor:pointer;transition:.2s;flex:none}
.pm-close:hover{background:var(--border);color:var(--text)}
.pm-order{display:flex;align-items:center;gap:14px;background:var(--bg);border-radius:12px;padding:14px 16px;margin-bottom:18px}
.pm-goods{flex:1;min-width:0}
.pm-gname{font-size:15px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pm-gdesc{font-size:12px;color:var(--text-3);margin-top:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pm-amount{font-size:26px;font-weight:800;color:var(--accent);flex:none;line-height:1.1}
.pm-amount small{font-size:14px;font-weight:600;margin-right:1px}
.pm-methods{display:flex;flex-direction:column;gap:12px}
.pm-item{display:flex;align-items:center;gap:12px;border:1.5px solid var(--border);border-radius:12px;padding:11px 14px;min-height:60px;cursor:pointer;background:var(--card);transition:border-color .18s,background .18s,box-shadow .18s,transform .18s;user-select:none}
.pm-item:hover{border-color:var(--text-3)}
.pm-item:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.pm-item:active{transform:scale(.99)}
.pm-logo{width:38px;height:38px;border-radius:10px;display:grid;place-items:center;color:#fff;font-size:17px;font-weight:800;flex:none;background:var(--mc)}
.pm-douyin .pm-logo{background:linear-gradient(135deg,#25f4ee 0%,#111 48%,#fe2c55 100%)}
.pm-info{display:flex;flex-direction:column;min-width:0}
.pm-info b{font-size:15px;font-weight:700}
.pm-info small{font-size:12px;color:var(--text-3);margin-top:1px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pm-radio{margin-left:auto;width:20px;height:20px;border-radius:50%;border:2px solid var(--border);display:grid;place-items:center;flex:none;transition:.18s}
.pm-dot{width:10px;height:10px;border-radius:50%;background:var(--mc);transform:scale(0);transition:transform .18s}
.pm-item.is-on{border-color:var(--mc)}
.pm-item.is-on .pm-radio{border-color:var(--mc)}
.pm-item.is-on .pm-dot{transform:scale(1)}
.pm-alipay.is-on{background:rgba(22,119,255,.08)}
.pm-wxpay.is-on{background:rgba(7,193,96,.08)}
.pm-douyin.is-on{border-color:#fe2c55;background:rgba(254,44,85,.08)}
.pm-douyin.is-on .pm-radio{border-color:#fe2c55}
.pm-douyin.is-on .pm-dot{background:#fe2c55}
.pm-confirm{width:100%;height:48px;margin-top:20px;border:none;border-radius:24px;background:var(--pc,var(--primary));color:#fff;font-size:16px;font-weight:700;cursor:pointer;transition:filter .18s,opacity .18s,transform .18s;box-shadow:0 6px 16px rgba(0,0,0,.12)}
.pm-confirm:hover{filter:brightness(1.06)}
.pm-confirm:active{transform:scale(.99)}
.pm-confirm.is-loading{opacity:.75;cursor:wait}
.pm-secure{text-align:center;font-size:12px;color:var(--text-3);margin-top:12px}
@media(max-width:480px){
  .pay-modal{padding:18px 16px 20px;border-radius:16px}
  .pm-item{padding:10px 12px;min-height:56px}
  .pm-amount{font-size:22px}
  .pm-confirm{height:46px}
}

/* toast */
#toast{position:fixed;top:80px;left:50%;transform:translateX(-50%);z-index:2000;display:flex;flex-direction:column;gap:10px;align-items:center;pointer-events:none}
.toast{background:rgba(30,32,40,.92);color:#fff;padding:10px 22px;border-radius:20px;font-size:14px;box-shadow:var(--shadow-h);animation:toastIn .25s}
@keyframes toastIn{from{opacity:0;transform:translateY(-10px)}to{opacity:1}}

/* 空状态/分页 */
.empty{text-align:center;padding:60px 0;color:var(--text-3)}
.empty .ico{font-size:46px;margin-bottom:10px}
.pager{display:flex;gap:8px;justify-content:center;margin:30px 0}
.pager button{min-width:36px;height:36px;border-radius:8px;border:1px solid var(--border);background:var(--card);color:var(--text)}
.pager button.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.pager button:disabled{opacity:.4}

/* 用户中心侧栏 */
.layout{display:flex;gap:22px;align-items:flex-start;margin:22px 0}
.side-menu{width:200px;flex:none;background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:10px;position:sticky;top:80px}
.side-menu a{display:block;padding:11px 14px;border-radius:8px;color:var(--text-2);font-size:14px;cursor:pointer}
.side-menu a:hover{background:var(--bg);color:var(--primary)}
.side-menu a.active{background:rgba(58,111,247,.12);color:var(--primary);font-weight:600}
.layout .content{flex:1;min-width:0}

/* 订单/表格 */
table.tb{width:100%;border-collapse:collapse;font-size:14px}
table.tb th,table.tb td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--border)}
table.tb th{color:var(--text-2);font-weight:600;background:var(--bg)}
table.tb tr:hover td{background:var(--bg)}
.status-tag{padding:2px 10px;border-radius:10px;font-size:12px}
.st-0{background:#fff4e5;color:#fa8c16}
.st-1{background:#e6f7ee;color:#16a34a}
.st-2{background:#f0f0f0;color:#999}
.st-3{background:#fff1f0;color:#f5222d}

/* 会员套餐 */
.plan-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.plan{background:var(--card);border-radius:14px;padding:26px 22px;box-shadow:var(--shadow);text-align:center;border:2px solid transparent;transition:.2s;position:relative}
.plan:hover{border-color:var(--primary);transform:translateY(-4px)}
.plan.hot{border-color:var(--accent)}
.plan .tag-hot{position:absolute;top:-11px;left:50%;transform:translateX(-50%);background:var(--accent);color:#fff;font-size:12px;padding:2px 14px;border-radius:10px}
.plan .pname{font-size:18px;font-weight:800}
.plan .pprice{font-size:34px;font-weight:800;color:var(--accent);margin:14px 0}
.plan .pprice small{font-size:14px;color:var(--text-3)}
.plan .porig{color:var(--text-3);text-decoration:line-through;font-size:13px}
.plan .pperks{font-size:13px;color:var(--text-2);margin:14px 0 20px;line-height:2}

/* 阅读器 */
.reader-wrap{min-height:100vh;background:var(--reader-bg);color:var(--reader-text);transition:background .3s}
.reader-bar{position:sticky;top:0;background:var(--card);border-bottom:1px solid var(--border);z-index:50}
.reader-bar .rb-in{max-width:860px;margin:0 auto;padding:10px 16px;display:flex;align-items:center;gap:14px}
.reader-bar a,.reader-bar button{color:var(--text-2);font-size:14px;background:none}
.reader-bar .rb-title{font-weight:600;flex:1;text-align:center;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.reader-content{max-width:860px;margin:0 auto;padding:36px 24px 80px}
.reader-content h1{font-size:26px;text-align:center;margin-bottom:8px}
.reader-content .rc-meta{text-align:center;color:var(--text-3);font-size:13px;margin-bottom:34px}
#readerText{font-size:var(--read-size,20px);line-height:2;white-space:pre-wrap;word-break:break-word}
.reader-foot{max-width:860px;margin:0 auto;display:flex;gap:14px;justify-content:center;padding-bottom:60px}
.reader-set{position:fixed;left:0;right:0;bottom:0;background:var(--card);border-top:1px solid var(--border);padding:14px 20px;display:none;z-index:60}
.reader-set.show{display:block}
.reader-set .rs-in{max-width:860px;margin:0 auto;display:flex;align-items:center;gap:22px;flex-wrap:wrap;font-size:14px}
.reader-set button{padding:5px 12px;border:1px solid var(--border);border-radius:6px;background:var(--card);color:var(--text)}
.reader-lock-tip{text-align:center;padding:60px 20px;background:var(--card);border-radius:12px;margin-top:30px}
.reader-lock-tip .big{font-size:40px;margin-bottom:12px}

/* 后台 */
.admin-body{display:flex;min-height:100vh;background:var(--bg)}
.admin-side{width:210px;flex:none;background:#1f2430;color:#aeb7c8;padding:18px 0;position:fixed;top:0;bottom:0;left:0;overflow-y:auto}
.admin-side .alogo{color:#fff;font-size:18px;font-weight:800;padding:6px 20px 20px;display:flex;align-items:center;gap:8px}
.admin-side a{display:block;padding:11px 20px;color:#aeb7c8;font-size:14px;cursor:pointer}
.admin-side a:hover{background:#2a3040;color:#fff}
.admin-side a.active{background:var(--primary);color:#fff}
.admin-main{flex:1;margin-left:210px;padding:22px 26px;min-width:0}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:22px}
.stat-card{background:var(--card);border-radius:12px;padding:20px;box-shadow:var(--shadow)}
.stat-card .sv{font-size:26px;font-weight:800;margin-top:6px}
.stat-card .sl{color:var(--text-2);font-size:13px}
.stat-card .si{width:40px;height:40px;border-radius:10px;display:grid;place-items:center;font-size:20px;color:#fff;margin-bottom:8px}

/* 页脚 */
.footer{background:var(--card);border-top:1px solid var(--border);margin-top:50px;padding:30px 0;color:var(--text-3);font-size:13px}
.footer .fin{max-width:var(--maxw);margin:0 auto;padding:0 16px;text-align:center;line-height:2}

/* 响应式 */
@media(max-width:1024px){
  .grid-books{grid-template-columns:repeat(4,1fr)}
  .grid-5{grid-template-columns:repeat(3,1fr)}
  .chapter-list{grid-template-columns:repeat(3,1fr)}
  .plan-grid{grid-template-columns:1fr}
  .stat-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:640px){
  .nav{display:none}.search-box{max-width:none}
  .grid-books,.grid-5,.grid-4{grid-template-columns:repeat(3,1fr);gap:10px}
  .detail-top{flex-direction:column;align-items:center;text-align:center}
  .chapter-list{grid-template-columns:repeat(2,1fr)}
  .layout{flex-direction:column}.side-menu{width:100%;position:static;display:flex;overflow-x:auto}
  .admin-side{position:static;width:100%;display:flex;flex-wrap:gap:0}.admin-body{flex-direction:column}.admin-main{margin-left:0}
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .stat-row{justify-content:center}
}