:root{
  --bg:#f5f6f8; --card:#ffffff; --text:#1f2329; --muted:#8a9099;
  --primary:#2f6fed; --primary-d:#2257c4; --border:#e6e8eb; --danger:#e5484d;
}
*{box-sizing:border-box;}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);}
a{color:inherit;text-decoration:none;}

.topbar{display:flex;align-items:center;justify-content:space-between;height:56px;padding:0 24px;background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10;}
.brand{font-weight:700;font-size:18px;}
.nav-right{display:flex;align-items:center;gap:12px;}
.uname{color:var(--muted);font-size:14px;}

.container{max-width:1100px;margin:0 auto;padding:24px;}
.toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;}
.toolbar h3{margin:0;font-size:20px;}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:20px;}
.card{background:var(--card);border:1px solid var(--border);border-radius:12px;overflow:hidden;transition:box-shadow .15s,transform .15s;}
.card:hover{box-shadow:0 6px 20px rgba(0,0,0,.08);transform:translateY(-2px);}
.card-cover{position:relative;display:block;height:220px;background:linear-gradient(135deg,#eef2ff,#dfe7ff);overflow:hidden;}
.cover-img{width:100%;height:100%;object-fit:cover;display:block;}
.cover-ph{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:64px;height:84px;border-radius:6px;background:#2f6fed;color:#fff;font-size:40px;font-weight:700;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 10px rgba(47,111,237,.3);}
.card-body{padding:12px 14px;}
.card-title{display:block;font-weight:600;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.card-meta{color:var(--muted);font-size:12px;margin-top:4px;}

.empty{color:var(--muted);padding:40px 0;text-align:center;grid-column:1/-1;}

.btn{display:inline-block;padding:8px 14px;border:1px solid var(--border);border-radius:8px;background:var(--card);cursor:pointer;font-size:14px;color:var(--text);}
.btn:hover{border-color:#cfd3d8;}
.btn.primary{background:var(--primary);border-color:var(--primary);color:#fff;}
.btn.primary:hover{background:var(--primary-d);}
.btn.danger{color:var(--danger);border-color:#f3c2c4;}
.link{color:var(--primary);font-size:14px;}

/* auth */
.auth-wrap{display:flex;align-items:center;justify-content:center;min-height:calc(100vh - 56px);}
.auth-card{width:360px;background:var(--card);border:1px solid var(--border);border-radius:14px;padding:28px;}
.auth-card h2{margin:0 0 16px;}
.tabs{display:flex;gap:8px;margin-bottom:16px;}
.tab{flex:1;padding:8px;border:1px solid var(--border);background:var(--card);border-radius:8px;cursor:pointer;font-size:14px;}
.tab.active{background:var(--primary);color:#fff;border-color:var(--primary);}
form label{display:block;font-size:13px;color:var(--muted);margin-bottom:12px;}
form input,form select{width:100%;margin-top:6px;padding:10px;border:1px solid var(--border);border-radius:8px;font-size:14px;color:var(--text);background:#fff;}
.hint{font-size:12px;color:var(--muted);}
.error{color:var(--danger);font-size:13px;min-height:18px;margin:4px 0;}

/* modal */
.modal{position:fixed;inset:0;background:rgba(0,0,0,.4);display:flex;align-items:center;justify-content:center;z-index:50;}
.modal[hidden]{display:none;}
.modal-card{width:420px;background:var(--card);border-radius:14px;padding:24px;}
.modal-card h3{margin:0 0 16px;}
.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:8px;}

/* admin */
.toolbar-actions{display:flex;align-items:center;gap:14px;flex-wrap:wrap;}
.switch{display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--muted);cursor:pointer;margin:0;}
.switch input{width:16px;height:16px;accent-color:var(--primary);cursor:pointer;}
.row-actions{display:flex;gap:8px;flex-wrap:wrap;}
.tag{display:inline-block;padding:1px 6px;border-radius:999px;background:#eef2ff;color:var(--primary);font-size:12px;vertical-align:1px;}
.btn[disabled]{opacity:.4;cursor:not-allowed;}
.admin-table{width:100%;border-collapse:collapse;background:var(--card);border:1px solid var(--border);border-radius:10px;overflow:hidden;margin-bottom:28px;}
.admin-table th,.admin-table td{padding:10px 12px;text-align:left;font-size:14px;border-bottom:1px solid var(--border);}
.admin-table th{background:#fafbfc;color:var(--muted);font-weight:600;}
.admin-table tr:last-child td{border-bottom:none;}

/* reader：纵向三段布局(顶栏/工具条/书区/缩放条)，工具条独占一行，不遮挡书页
   100dvh：移动端浏览器地址栏收起/展开时不产生滚动或错位 */
body.reader{display:flex;flex-direction:column;height:100vh;height:100dvh;overflow:hidden;}
body.reader .topbar{flex:0 0 56px;}
.reader-stage{background:#525659;flex:1 1 auto;min-height:0;display:flex;align-items:center;justify-content:center;overflow:hidden;position:relative;padding:12px;}
.reader-stage.panning{cursor:grab;}
.reader-stage.grabbing{cursor:grabbing;}
#book{flex:0 0 auto;transform-origin:center center;transition:transform .28s ease;}
#book.no-anim{transition:none;}
/* page-flip 引擎所需样式（引擎自带 stPageFlip.css 未引入，这里补齐关键部分） */
.stf__parent{position:relative;display:block;box-sizing:border-box;}
.stf__wrapper{position:relative;width:100%;height:100%;box-sizing:border-box;}
.stf__parent canvas.stf__canvas{position:absolute;width:100%;height:100%;left:0;top:0;touch-action:none;}
.rtitle{color:#fff;font-size:15px;font-weight:600;max-width:50vw;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
#status{font-size:13px;color:#cfd3d8;}

/* 页面左右两侧的翻页箭头 */
.flip-arrow{position:fixed;top:50%;transform:translate(0,calc(-50% + 27px));z-index:25;width:44px;height:72px;border:1px solid #565a60;background:rgba(58,61,66,.72);color:#fff;font-size:30px;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;user-select:none;padding:0 0 4px;}
.flip-arrow:hover{background:rgba(90,95,102,.92);}
.flip-arrow:disabled{opacity:.28;cursor:not-allowed;}
.flip-arrow[hidden]{display:none;}
.flip-arrow.left{left:0;border-left:none;border-radius:0 10px 10px 0;}
.flip-arrow.right{right:0;border-right:none;border-radius:10px 0 0 10px;}

/* 翻页工具条：独立一行，位于书区上方 */
.reader-toolbar{display:flex;align-items:center;justify-content:center;gap:8px;flex:0 0 auto;height:44px;padding:0 16px;background:#3a3d42;border-bottom:1px solid #2c2e31;z-index:20;}
.reader-toolbar[hidden]{display:none;}
.tbtn{display:inline-flex;align-items:center;justify-content:center;min-width:34px;height:32px;padding:0 9px;border:1px solid rgba(255,255,255,.14);background:rgba(255,255,255,.06);color:#fff;border-radius:8px;cursor:pointer;font-size:15px;line-height:1;user-select:none;}
.tbtn:hover{background:rgba(255,255,255,.14);}
.tbtn:disabled{opacity:.35;cursor:not-allowed;}
/* 全屏按钮：进入全屏 / 退出全屏 两套图标互斥显示 */
.fs-btn .fs-i{display:none;}
.fs-btn .fs-i-enter{display:inline-flex;}
html:fullscreen .fs-btn .fs-i-enter,
body.is-fs .fs-btn .fs-i-enter{display:none;}
html:fullscreen .fs-btn .fs-i-exit,
body.is-fs .fs-btn .fs-i-exit{display:inline-flex;}
.page-input{width:64px;height:32px;padding:0 8px;border:1px solid rgba(255,255,255,.14);background:rgba(0,0,0,.35);color:#fff;border-radius:8px;font-size:15px;text-align:center;outline:none;}
.page-input:focus{border-color:var(--primary);}
.page-input::-webkit-outer-spin-button,.page-input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0;}
.page-sep{color:rgba(255,255,255,.75);font-size:14px;white-space:nowrap;}
.page-label{color:rgba(255,255,255,.75);font-size:13px;margin-right:2px;}

/* 缩放控件：独立一行，位于书区下方 */
.zoom-bar{flex:0 0 auto;height:46px;background:#3a3d42;border-top:1px solid #2c2e31;z-index:30;display:flex;align-items:center;justify-content:center;gap:10px;padding:0 16px;}
.zbtn{width:30px;height:30px;border-radius:50%;border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.06);color:#fff;font-size:16px;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;padding:0;user-select:none;}
.zbtn:hover{background:rgba(255,255,255,.16);}
.zbtn:active{background:var(--primary);border-color:var(--primary);}
.zbtn.text{width:auto;border-radius:999px;padding:0 12px;font-size:13px;}
.zoom-bar input[type=range]{width:130px;accent-color:var(--primary);cursor:pointer;height:4px;}
.zoom-label{color:#fff;font-size:13px;min-width:42px;text-align:center;font-variant-numeric:tabular-nums;}
.zoom-divider{width:1px;height:18px;background:rgba(255,255,255,.18);}

/* ===== 全屏：隐藏顶部 header（返回书架改由工具条上的「书架」按钮承担） ===== */
html:fullscreen body.reader .topbar,
body.is-fs .topbar{display:none;}
/* 工具条上的「书架」按钮：仅在全屏时显示（此时顶栏已隐藏，用它返回书架） */
#shelfBtn{display:none;}
html:fullscreen #shelfBtn,
body.is-fs #shelfBtn{display:inline-flex;}

/* ===== 移动端适配（与 reader.js 的单页阈值 900px 保持一致） ===== */
@media (max-width: 900px){
  .topbar{height:48px;padding:0 12px;}
  body.reader .topbar{flex:0 0 48px;}
  .brand{font-size:16px;}
  .rtitle{font-size:13px;max-width:40vw;}
  #status{font-size:11px;}
  .btn{padding:6px 10px;font-size:13px;}
  .reader-top{gap:8px;}

  .reader-stage{padding:6px;}
  .reader-toolbar{height:44px;gap:6px;padding:0 8px;}
  .tbtn{min-width:34px;height:34px;padding:0 7px;font-size:14px;}
  .page-input{width:54px;height:34px;font-size:14px;padding:0 4px;}
  .page-label{display:none;}
  .page-sep{font-size:13px;}
  /* 小屏：左右箭头会挡住内容，改为滑动手势 + 工具条按钮翻页 */
  .flip-arrow{display:none !important;}

  .zoom-bar{height:52px;gap:8px;padding:0 10px calc(env(safe-area-inset-bottom) * 0.5);}
  .zbtn{width:38px;height:38px;font-size:19px;}
  .zoom-bar input[type=range]{flex:1 1 auto;width:auto;min-width:70px;height:6px;}
  .zoom-label{min-width:46px;font-size:12px;}

  .toolbar-actions{gap:10px;}
  .row-actions{gap:6px;}
  .row-actions .btn{padding:5px 8px;font-size:12px;}
  .container{padding:14px 12px;}
  .grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px;}
  .card-cover{height:160px;}
  .toolbar{flex-direction:column;align-items:flex-start;gap:10px;}
  .auth-wrap{padding:0 12px;}
  .auth-card{width:auto;max-width:380px;padding:20px;}
  .modal-card{width:auto;margin:0 12px;padding:18px;}
  .admin-table th,.admin-table td{padding:8px 10px;font-size:13px;}
}
@media (max-width: 430px){
  .brand{display:none;}            /* 窄屏给书名让位 */
  .rtitle{max-width:46vw;}
}
/* 横屏矮屏（手机横放）：三条控制栏进一步压缩，把垂直空间让给书页 */
@media (max-height: 540px){
  .topbar{height:40px;padding:0 10px;}
  body.reader .topbar{flex:0 0 40px;}
  .reader-toolbar{height:38px;}
  .tbtn{min-width:30px;height:30px;padding:0 6px;font-size:13px;}
  .page-input{width:48px;height:30px;font-size:13px;}
  .zoom-bar{height:42px;}
  .zbtn{width:32px;height:32px;font-size:16px;}
  .zoom-label{display:none;}
  .reader-stage{padding:4px;}
}
@media (pointer: coarse){
  /* 触屏设备：点击高亮与长按选中去除，避免干扰翻页手势 */
  .tbtn,.zbtn,.flip-arrow{-webkit-tap-highlight-color:transparent;}
}