/* ========== 全局重置 ========== */
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
:root{
  --primary:#4A90D9;--primary-dark:#357ABD;--primary-light:#E8F1FC;
  --bg:#f5f6fa;--card:#fff;--text:#2c3e50;--text-light:#7f8c8d;--border:#e9ecef;
  --success:#27ae60;--danger:#e74c3c;--warning:#f39c12;--shadow:0 2px 12px rgba(0,0,0,.08);
  --radius:14px;--safe-top:env(safe-area-inset-top,0px);--safe-bottom:env(safe-area-inset-bottom,0px);
}
html{font-size:16px;-webkit-text-size-adjust:100%}
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;overflow-x:hidden}
img{max-width:100%;display:block}
button{cursor:pointer;border:none;outline:none;font-family:inherit}
input,textarea{font-family:inherit;outline:none}
a{color:var(--primary);text-decoration:none}
.hidden{display:none!important}
.fade-in{animation:fadeIn .3s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ========== 顶部导航栏 ========== */
.navbar{
  position:sticky;top:0;z-index:100;
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff;padding:calc(.7rem + var(--safe-top)) .9rem .7rem;
  display:flex;align-items:center;justify-content:space-between;
  box-shadow:0 2px 10px rgba(74,144,217,.3);
}
.navbar h1{font-size:1.15rem;font-weight:600;display:flex;align-items:center;gap:.4rem}
.navbar .nav-actions{display:flex;gap:.5rem}
.navbar .btn-icon{
  width:38px;height:38px;border-radius:10px;
  background:rgba(255,255,255,.15);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:1.2rem;
  transition:background .2s;
}
.navbar .btn-icon:active{background:rgba(255,255,255,.3)}

/* ========== 首页 - 版本选择 ========== */
.home-section{padding:1rem .9rem calc(2rem + var(--safe-bottom))}
.section-title{font-size:1.1rem;font-weight:600;margin-bottom:.8rem;display:flex;align-items:center;gap:.4rem}
.version-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:.8rem}
.version-card{
  background:var(--card);border-radius:var(--radius);padding:1.1rem .9rem;
  box-shadow:var(--shadow);text-align:center;transition:transform .15s,box-shadow .15s;
  border:2px solid transparent;cursor:pointer;
}
.version-card:active{transform:scale(.97)}
.version-card .v-icon{font-size:2rem;margin-bottom:.4rem}
.version-card .v-name{font-size:1rem;font-weight:600;margin-bottom:.2rem}
.version-card .v-full{font-size:.72rem;color:var(--text-light);line-height:1.3}
.version-card .v-badge{
  display:inline-block;margin-top:.4rem;padding:.1rem .5rem;
  border-radius:20px;font-size:.68rem;font-weight:500;
}

/* ========== 年级选择 ========== */
.grade-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.6rem}
.grade-card{
  background:var(--card);border-radius:12px;padding:.9rem .5rem;
  text-align:center;box-shadow:var(--shadow);border:2px solid transparent;
  transition:transform .15s;
}
.grade-card:active{transform:scale(.96)}
.grade-card .g-num{font-size:1.4rem;font-weight:700}
.grade-card .g-label{font-size:.75rem;color:var(--text-light)}
.grade-card.has-book{border-color:var(--primary);background:var(--primary-light)}
.grade-card.no-book{opacity:.45}
.semester-tabs{display:flex;gap:.5rem;margin-bottom:.8rem}
.semester-tab{
  flex:1;padding:.6rem;border-radius:10px;background:var(--card);
  text-align:center;font-size:.9rem;font-weight:500;border:2px solid var(--border);
  transition:all .2s;
}
.semester-tab.active{border-color:var(--primary);background:var(--primary-light);color:var(--primary-dark)}

/* ========== 课本浏览器 ========== */
.viewer-page{position:fixed;inset:0;background:#1a1a1a;z-index:200;display:flex;flex-direction:column}
.viewer-header{
  display:flex;align-items:center;justify-content:space-between;
  padding:calc(.5rem + var(--safe-top)) .8rem .5rem;
  background:rgba(0,0,0,.85);color:#fff;backdrop-filter:blur(10px);
}
.viewer-header .vh-title{font-size:.85rem;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:50%}
.viewer-header .vh-actions{display:flex;gap:.3rem}
.viewer-header .vh-btn{
  width:36px;height:36px;border-radius:8px;background:rgba(255,255,255,.1);
  color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.1rem;
}
.viewer-header .vh-btn:active{background:rgba(255,255,255,.25)}
.viewer-header .vh-btn.active{background:var(--primary);color:#fff}

.viewer-content{flex:1;position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center;touch-action:none}
.page-img{
  max-width:100%;max-height:100%;object-fit:contain;
  user-select:none;-webkit-user-select:none;-webkit-touch-callout:none;
  transform-origin:center center;
  will-change:transform;
}
/* 默认无过渡：拖拽/双指缩放绝对跟手；仅滚轮、双击、按钮触发时短暂开启 */
.page-img.animating{transition:transform .18s ease-out}
.page-img.zoomed{cursor:grab}
.page-img.panning{cursor:grabbing}
.zoom-badge{
  position:absolute;left:50%;top:14px;transform:translateX(-50%);
  background:rgba(0,0,0,.72);color:#fff;font-size:13px;font-weight:600;
  padding:6px 14px;border-radius:999px;pointer-events:none;
  opacity:0;transition:opacity .25s ease;z-index:30;letter-spacing:.5px;
}
.zoom-badge.show{opacity:1}
.page-placeholder{
  width:80%;max-width:400px;aspect-ratio:3/4;
  background:linear-gradient(135deg,#2a2a3e,#1a1a2e);
  border-radius:16px;display:flex;flex-direction:column;align-items:center;justify-content:center;
  color:#666;gap:.5rem;
}
.page-placeholder .pp-icon{font-size:3rem;opacity:.3}
.page-placeholder .pp-text{font-size:.9rem;color:#555}

/* 翻页按钮 */
.page-nav-btn{
  position:absolute;top:50%;transform:translateY(-50%);
  width:44px;height:44px;border-radius:50%;
  background:rgba(0,0,0,.5);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-size:1.3rem;z-index:5;
}
.page-nav-btn:active{background:rgba(0,0,0,.7)}
.page-nav-btn.prev{left:.5rem}
.page-nav-btn.next{right:.5rem}

/* 底部工具栏 */
.viewer-footer{
  background:rgba(0,0,0,.85);backdrop-filter:blur(10px);
  padding:.4rem .8rem calc(.4rem + var(--safe-bottom));
}
.page-slider{display:flex;align-items:center;gap:.6rem;color:#fff}
.page-slider input[type=range]{
  flex:1;height:6px;-webkit-appearance:none;background:rgba(255,255,255,.2);border-radius:3px;
}
.page-slider input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:20px;height:20px;border-radius:50%;background:var(--primary);cursor:pointer;
}
.page-slider .page-num{font-size:.85rem;min-width:60px;text-align:center}

/* 缩略图条 */
.thumb-bar{
  display:flex;gap:.4rem;overflow-x:auto;padding:.5rem 0;
  scrollbar-width:none;-ms-overflow-style:none;
}
.thumb-bar::-webkit-scrollbar{display:none}
.thumb-item{
  flex-shrink:0;width:50px;height:68px;border-radius:6px;overflow:hidden;
  border:2px solid transparent;cursor:pointer;background:#333;
}
.thumb-item img{width:100%;height:100%;object-fit:cover}
.thumb-item.active{border-color:var(--primary)}
.thumb-item .ti-num{font-size:.6rem;color:#999;text-align:center;margin-top:.15rem}

/* 标注画笔工具 */
.draw-toolbar{
  position:absolute;bottom:80px;left:50%;transform:translateX(-50%);
  display:flex;align-items:center;gap:.4rem;
  background:rgba(0,0,0,.85);border-radius:30px;padding:.4rem .6rem;
  backdrop-filter:blur(10px);z-index:10;
}
.draw-toolbar .dt-color{
  width:28px;height:28px;border-radius:50%;cursor:pointer;border:2px solid rgba(255,255,255,.3);
}
.draw-toolbar .dt-color.active{border-color:#fff;transform:scale(1.15)}
.draw-toolbar .dt-btn{
  width:36px;height:36px;border-radius:10px;background:rgba(255,255,255,.1);
  color:#fff;display:flex;align-items:center;justify-content:center;font-size:1rem;
}
.draw-toolbar .dt-btn:active{background:rgba(255,255,255,.25)}
.draw-toolbar .dt-btn.active{background:var(--primary)}

/* 备注弹层 */
.note-panel{
  position:fixed;bottom:0;left:0;right:0;
  background:var(--card);border-radius:20px 20px 0 0;
  padding:1.2rem 1rem calc(1rem + var(--safe-bottom));
  box-shadow:0 -4px 20px rgba(0,0,0,.15);z-index:150;
  max-height:60vh;overflow-y:auto;
}
.note-panel .np-handle{width:40px;height:4px;background:#ddd;border-radius:2px;margin:0 auto .8rem}
.note-panel .np-title{font-size:1rem;font-weight:600;margin-bottom:.6rem}
.note-panel textarea{
  width:100%;min-height:80px;border:2px solid var(--border);border-radius:10px;
  padding:.6rem;font-size:.9rem;resize:none;
}
.note-panel textarea:focus{border-color:var(--primary)}
.note-panel .np-tags{display:flex;flex-wrap:wrap;gap:.4rem;margin-top:.5rem}
.note-panel .np-tag{
  padding:.2rem .6rem;border-radius:20px;font-size:.75rem;
  background:var(--primary-light);color:var(--primary-dark);cursor:pointer;
}
.note-panel .np-actions{display:flex;gap:.5rem;margin-top:.8rem}
.note-panel .np-actions button{flex:1;padding:.6rem;border-radius:10px;font-size:.9rem;font-weight:500}

/* ========== 管理后台 ========== */
.admin-login{
  position:fixed;inset:0;background:var(--bg);z-index:300;
  display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem;
}
.admin-login .al-logo{font-size:3rem;margin-bottom:1rem}
.admin-login .al-title{font-size:1.3rem;font-weight:600;margin-bottom:.4rem}
.admin-login .al-sub{font-size:.85rem;color:var(--text-light);margin-bottom:1.5rem}
.admin-login input{
  width:100%;max-width:300px;padding:.8rem 1rem;border:2px solid var(--border);
  border-radius:12px;font-size:1rem;text-align:center;
}
.admin-login input:focus{border-color:var(--primary)}
.admin-login button{
  width:100%;max-width:300px;padding:.8rem;margin-top:.8rem;
  background:var(--primary);color:#fff;border-radius:12px;font-size:1rem;font-weight:500;
}
.admin-login button:active{background:var(--primary-dark)}

.admin-page{padding-bottom:3rem}
.admin-tabs{
  display:flex;background:var(--card);box-shadow:var(--shadow);
  position:sticky;top:calc(2.5rem + var(--safe-top));z-index:50;
  overflow-x:auto;scrollbar-width:none;
}
.admin-tabs::-webkit-scrollbar{display:none}
.admin-tab{
  flex:1;min-width:80px;padding:.7rem .5rem;text-align:center;
  font-size:.82rem;color:var(--text-light);border-bottom:2px solid transparent;
  transition:all .2s;white-space:nowrap;
}
.admin-tab.active{color:var(--primary);border-bottom-color:var(--primary);font-weight:600}

.admin-section{padding:1rem .9rem}
.stat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:.7rem;margin-bottom:1rem}
.stat-card{
  background:var(--card);border-radius:var(--radius);padding:1rem;
  box-shadow:var(--shadow);text-align:center;
}
.stat-card .sc-num{font-size:1.8rem;font-weight:700;color:var(--primary)}
.stat-card .sc-label{font-size:.78rem;color:var(--text-light);margin-top:.2rem}

/* 管理面板卡片 */
.panel-card{
  background:var(--card);border-radius:var(--radius);padding:1rem;
  box-shadow:var(--shadow);margin-bottom:.8rem;
}
.panel-card .pc-title{font-size:.95rem;font-weight:600;margin-bottom:.6rem;display:flex;align-items:center;gap:.4rem}
.panel-card .pc-desc{font-size:.8rem;color:var(--text-light);margin-bottom:.6rem}

/* 表单 */
.form-group{margin-bottom:.7rem}
.form-group label{display:block;font-size:.82rem;font-weight:500;margin-bottom:.3rem;color:var(--text)}
.form-group input,.form-group select,.form-group textarea{
  width:100%;padding:.6rem .8rem;border:2px solid var(--border);border-radius:10px;font-size:.9rem;
}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{border-color:var(--primary)}

/* 按钮 */
.btn{
  padding:.6rem 1rem;border-radius:10px;font-size:.9rem;font-weight:500;
  display:inline-flex;align-items:center;justify-content:center;gap:.3rem;
  transition:all .15s;
}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:active{background:var(--primary-dark)}
.btn-success{background:var(--success);color:#fff}
.btn-danger{background:var(--danger);color:#fff}
.btn-outline{background:transparent;border:2px solid var(--border);color:var(--text)}
.btn-outline:active{background:var(--bg)}
.btn-block{width:100%}

/* 上传区域 */
.upload-zone{
  border:2px dashed var(--border);border-radius:var(--radius);
  padding:2rem 1rem;text-align:center;transition:all .2s;cursor:pointer;
}
.upload-zone:active,.upload-zone.dragover{border-color:var(--primary);background:var(--primary-light)}
.upload-zone .uz-icon{font-size:2.5rem;margin-bottom:.5rem}
.upload-zone .uz-text{font-size:.9rem;color:var(--text-light)}
.upload-zone .uz-hint{font-size:.75rem;color:var(--text-light);margin-top:.3rem}

/* 页面网格 */
.page-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.5rem}
.page-grid-item{
  position:relative;aspect-ratio:3/4;border-radius:8px;overflow:hidden;
  background:var(--bg);border:2px solid transparent;cursor:pointer;
}
.page-grid-item.has-img{border-color:var(--success)}
.page-grid-item.no-img{border-color:var(--border)}
.page-grid-item img{width:100%;height:100%;object-fit:cover}
.page-grid-item .pgi-num{
  position:absolute;bottom:0;left:0;right:0;
  background:rgba(0,0,0,.6);color:#fff;font-size:.7rem;text-align:center;padding:.1rem;
}
.page-grid-item .pgi-status{
  position:absolute;top:2px;right:2px;width:18px;height:18px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;font-size:.6rem;
}
.page-grid-item .pgi-status.has{background:var(--success);color:#fff}
.page-grid-item .pgi-status.no{background:var(--danger);color:#fff}

/* 搜索 */
.search-bar{
  position:relative;margin-bottom:.8rem;
}
.search-bar input{
  width:100%;padding:.6rem 2.2rem .6rem .8rem;
  border:2px solid var(--border);border-radius:22px;font-size:.9rem;
}
.search-bar input:focus{border-color:var(--primary)}
.search-bar .sb-icon{position:absolute;right:.7rem;top:50%;transform:translateY(-50%);font-size:1.1rem;color:var(--text-light)}

.search-results .sr-item{
  background:var(--card);border-radius:10px;padding:.7rem;margin-bottom:.5rem;
  box-shadow:var(--shadow);display:flex;align-items:center;gap:.6rem;cursor:pointer;
}
.search-results .sr-item:active{background:var(--bg)}

/* Toast */
.toast{
  position:fixed;bottom:calc(5rem + var(--safe-bottom));left:50%;transform:translateX(-50%);
  background:rgba(0,0,0,.8);color:#fff;padding:.6rem 1.2rem;border-radius:22px;
  font-size:.85rem;z-index:999;backdrop-filter:blur(10px);
  animation:toastIn .3s ease;
}
@keyframes toastIn{from{opacity:0;transform:translate(-50%,10px)}to{opacity:1;transform:translate(-50%,0)}}

/* 返回按钮 */
.back-btn{
  display:inline-flex;align-items:center;gap:.3rem;
  font-size:.85rem;color:var(--primary);margin-bottom:.6rem;cursor:pointer;
}

/* loading */
.loading{display:flex;align-items:center;justify-content:center;padding:2rem;color:var(--text-light)}
.loading .spin{width:24px;height:24px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite;margin-right:.5rem}
@keyframes spin{to{transform:rotate(360deg)}}

/* ========== 品牌首页 ========== */
.brand-hero{
  background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);
  color:#fff;padding:calc(2.5rem + var(--safe-top)) 1.2rem 2rem;text-align:center;
}
.brand-hero .bh-avatar{
  width:80px;height:80px;border-radius:50%;background:rgba(255,255,255,.2);
  margin:0 auto .8rem;display:flex;align-items:center;justify-content:center;
  font-size:2.5rem;border:3px solid rgba(255,255,255,.3);
}
.brand-hero .bh-name{font-size:1.5rem;font-weight:700;margin-bottom:.2rem}
.brand-hero .bh-sub{font-size:.85rem;opacity:.8;margin-bottom:.6rem}
.brand-hero .bh-tagline{font-size:1rem;font-weight:500;opacity:.95;margin-bottom:1rem}
.brand-hero .bh-desc{font-size:.82rem;opacity:.85;line-height:1.7;max-width:400px;margin:0 auto 1.2rem}
.brand-hero .bh-cta{display:flex;gap:.6rem;justify-content:center;flex-wrap:wrap}
.brand-hero .bh-cta .btn{
  padding:.7rem 1.5rem;border-radius:25px;font-size:.9rem;font-weight:600;
}
.brand-hero .bh-cta .btn-primary{background:#fff;color:#764ba2}
.brand-hero .bh-cta .btn-outline-w{background:rgba(255,255,255,.15);color:#fff;border:2px solid rgba(255,255,255,.4)}

.brand-services{padding:1.2rem .9rem}
.brand-services .bs-title{font-size:1.1rem;font-weight:600;margin-bottom:.8rem;text-align:center}
.service-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:.7rem}
.service-card{
  background:var(--card);border-radius:var(--radius);padding:1rem .8rem;
  box-shadow:var(--shadow);text-align:center;cursor:pointer;
  transition:transform .15s ease,box-shadow .15s ease;
}
.service-card:active{transform:scale(.97)}
.service-card .sc-icon{font-size:1.8rem;margin-bottom:.4rem}
.service-card .sc-title{font-size:.9rem;font-weight:600;margin-bottom:.2rem}
.service-card .sc-desc{font-size:.75rem;color:var(--text-light);line-height:1.4}
.service-card .sc-ext{color:#185FA5;font-weight:700;margin-left:2px}

.brand-textbooks{padding:1rem .9rem}
.brand-textbooks .bt-title{font-size:1.1rem;font-weight:600;margin-bottom:.8rem}

.brand-wechat{
  background:linear-gradient(135deg,#07c160,#06ad56);color:#fff;
  margin:0 .9rem;border-radius:var(--radius);padding:1.5rem 1rem;text-align:center;
}
.brand-wechat .bw-icon{font-size:2.5rem;margin-bottom:.5rem}
.brand-wechat .bw-title{font-size:1rem;font-weight:600;margin-bottom:.3rem}
.brand-wechat .bw-desc{font-size:.8rem;opacity:.9;margin-bottom:.8rem}
.brand-wechat .bw-qr{
  width:140px;height:170px;background:#fff;border-radius:12px;margin:0 auto;
  display:flex;align-items:center;justify-content:center;font-size:.7rem;color:#999;
  overflow:hidden;padding:6px;box-sizing:border-box;
}

.brand-footer{
  text-align:center;padding:1.5rem .9rem calc(1.5rem + var(--safe-bottom));
  font-size:.75rem;color:var(--text-light);
}

/* ========== 留资表单弹窗 ========== */
.lead-modal{
  position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:400;
  display:flex;align-items:center;justify-content:center;padding:1rem;
}
.lead-modal .lm-box{
  background:var(--card);border-radius:20px;padding:1.5rem 1.2rem;
  max-width:420px;width:100%;max-height:85vh;overflow-y:auto;
}
.lead-modal .lm-title{font-size:1.2rem;font-weight:700;text-align:center;margin-bottom:.3rem}
.lead-modal .lm-sub{font-size:.82rem;color:var(--text-light);text-align:center;margin-bottom:1rem}
.lead-modal .lm-close{
  position:absolute;top:.8rem;right:1rem;font-size:1.5rem;color:var(--text-light);
  cursor:pointer;
}
.lead-modal .lm-success{
  text-align:center;padding:2rem 1rem;
}
.lead-modal .lm-success .lms-icon{font-size:3rem;margin-bottom:.8rem}
.lead-modal .lm-success .lms-title{font-size:1.2rem;font-weight:600;margin-bottom:.4rem}
.lead-modal .lm-success .lms-desc{font-size:.88rem;color:var(--text-light);line-height:1.6}

/* 留资表单 - 试卷图片上传 */
.lead-upload-btn{transition:all .2s}
.lead-upload-btn:hover{background:#f0f7ff!important;border-color:var(--primary)!important;color:var(--primary)!important}
.lead-thumb img{transition:transform .2s}
.lead-thumb:hover img{transform:scale(1.05)}

.weakness-tags{display:flex;flex-wrap:wrap;gap:.4rem}
.weakness-tag{
  padding:.3rem .7rem;border-radius:20px;font-size:.78rem;
  background:var(--bg);color:var(--text-light);cursor:pointer;border:1.5px solid transparent;
  transition:all .15s;
}
.weakness-tag.active{background:var(--primary-light);color:var(--primary-dark);border-color:var(--primary)}

/* ========== 引导页 ========== */
.guide-overlay{
  position:fixed;inset:0;z-index:250;background:var(--bg);
  overflow-y:auto;-webkit-overflow-scrolling:touch;
}
.guide-overlay .go-header{
  position:sticky;top:0;background:var(--card);box-shadow:var(--shadow);
  padding:calc(.6rem + var(--safe-top)) .9rem .6rem;
  display:flex;align-items:center;justify-content:space-between;z-index:10;
}
.guide-overlay .go-header .gh-title{font-size:.95rem;font-weight:600}
.guide-overlay .go-header .gh-skip{
  font-size:.82rem;color:var(--text-light);cursor:pointer;
}
.guide-overlay .go-content{
  padding:1rem .9rem 6rem;max-width:600px;margin:0 auto;
}
.guide-overlay .go-content h2{font-size:1.3rem;margin-bottom:.5rem}
.guide-overlay .go-content h3{font-size:1.05rem;margin-bottom:.4rem}
.guide-overlay .go-content p{font-size:.88rem;line-height:1.7;margin-bottom:.6rem}
.guide-overlay .go-content ul{font-size:.88rem;line-height:1.8;padding-left:1.2rem;margin-bottom:.6rem}
.guide-overlay .go-content img{border-radius:10px;margin:.6rem 0}
.guide-overlay .go-cta{
  position:fixed;bottom:0;left:0;right:0;
  background:var(--card);box-shadow:0 -2px 12px rgba(0,0,0,.1);
  padding:.8rem 1rem calc(.8rem + var(--safe-bottom));
  display:flex;gap:.5rem;z-index:11;
}
.guide-overlay .go-cta .btn{flex:1;padding:.8rem;border-radius:25px;font-size:.95rem;font-weight:600}

/* ========== 提问弹窗 ========== */
.question-panel{
  position:fixed;bottom:0;left:0;right:0;
  background:var(--card);border-radius:20px 20px 0 0;
  padding:1.2rem 1rem calc(1rem + var(--safe-bottom));
  box-shadow:0 -4px 20px rgba(0,0,0,.15);z-index:150;
  max-height:70vh;overflow-y:auto;
}
.question-panel .qp-handle{width:40px;height:4px;background:#ddd;border-radius:2px;margin:0 auto .8rem}
.question-panel .qp-title{font-size:1rem;font-weight:600;margin-bottom:.6rem}
.question-panel .qp-list{margin-bottom:.8rem}
.question-panel .qp-item{
  background:var(--bg);border-radius:10px;padding:.7rem;margin-bottom:.5rem;
}
.question-panel .qp-item .qi-meta{font-size:.72rem;color:var(--text-light);margin-bottom:.3rem}
.question-panel .qp-item .qi-text{font-size:.85rem;line-height:1.5}
.question-panel .qp-item .qi-reply{
  background:var(--primary-light);border-radius:8px;padding:.5rem;margin-top:.4rem;
  font-size:.82rem;color:var(--primary-dark);
}
.question-panel textarea{
  width:100%;min-height:60px;border:2px solid var(--border);border-radius:10px;
  padding:.6rem;font-size:.88rem;resize:none;
}
.question-panel textarea:focus{border-color:var(--primary)}
.question-panel .qp-actions{display:flex;gap:.5rem;margin-top:.6rem}
.question-panel .qp-actions button{flex:1;padding:.5rem;border-radius:10px;font-size:.85rem;font-weight:500}

/* ========== 后台留资管理 ========== */
.lead-item{
  background:var(--card);border-radius:10px;padding:.8rem;margin-bottom:.5rem;
  box-shadow:var(--shadow);
}
.lead-item .li-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:.4rem}
.lead-item .li-name{font-size:.92rem;font-weight:600}
.lead-item .li-phone{font-size:.85rem;color:var(--primary)}
.lead-item .li-meta{font-size:.75rem;color:var(--text-light)}
.lead-item .li-tags{display:flex;flex-wrap:wrap;gap:.3rem;margin-top:.3rem}
.lead-item .li-tag{font-size:.7rem;padding:.1rem .5rem;border-radius:12px;background:var(--bg);color:var(--text-light)}
.lead-item .li-needs{font-size:.8rem;color:var(--text);margin-top:.3rem;line-height:1.4}
.lead-item .li-actions{display:flex;gap:.4rem;margin-top:.5rem;align-items:center}
.lead-item .li-status{
  font-size:.72rem;padding:.15rem .5rem;border-radius:12px;font-weight:500;
}
.lead-item .li-status.new{background:#fff3e0;color:#e65100}
.lead-item .li-status.contacted{background:#e3f2fd;color:#1565c0}
.lead-item .li-status.converted{background:#e8f5e9;color:#2e7d32}
.lead-item .li-status.closed{background:#f5f5f5;color:#999}

.filter-bar{display:flex;gap:.4rem;margin-bottom:.8rem;overflow-x:auto;scrollbar-width:none}
.filter-bar::-webkit-scrollbar{display:none}
.filter-bar .fb-chip{
  flex-shrink:0;padding:.4rem .8rem;border-radius:20px;font-size:.8rem;
  background:var(--card);border:2px solid var(--border);color:var(--text-light);cursor:pointer;
}
.filter-bar .fb-chip.active{border-color:var(--primary);background:var(--primary-light);color:var(--primary-dark)}

/* ========== 后台消息中心 ========== */
.msg-item{
  background:var(--card);border-radius:10px;padding:.8rem;margin-bottom:.5rem;
  box-shadow:var(--shadow);border-left:4px solid var(--border);
}
.msg-item.pending{border-left-color:var(--warning)}
.msg-item.replied{border-left-color:var(--success)}
.msg-item .mi-meta{font-size:.75rem;color:var(--text-light);margin-bottom:.3rem}
.msg-item .mi-question{font-size:.85rem;line-height:1.5;margin-bottom:.4rem}
.msg-item .mi-reply{background:var(--primary-light);border-radius:8px;padding:.4rem .6rem;font-size:.8rem;color:var(--primary-dark);margin-bottom:.4rem}
.msg-item .mi-actions{display:flex;gap:.4rem;align-items:center}
.msg-item .mi-actions input{flex:1;padding:.4rem .6rem;border:1.5px solid var(--border);border-radius:8px;font-size:.82rem}
.msg-item .mi-actions input:focus{border-color:var(--primary)}

/* ========== 后台引导页编辑器 ========== */
.guide-editor .ge-preview{
  background:#fff;border:2px solid var(--border);border-radius:10px;
  padding:1rem;margin-bottom:.8rem;min-height:200px;overflow-y:auto;
  max-height:400px;
}
.guide-editor .ge-preview h2{font-size:1.3rem;margin-bottom:.5rem}
.guide-editor .ge-preview h3{font-size:1.05rem;margin-bottom:.4rem}
.guide-editor .ge-preview p{font-size:.88rem;line-height:1.7;margin-bottom:.6rem}
.guide-editor .ge-preview ul{font-size:.88rem;line-height:1.8;padding-left:1.2rem;margin-bottom:.6rem}
.guide-editor .ge-preview img{border-radius:10px;margin:.6rem 0;max-width:100%}
.guide-editor .ge-toolbar{display:flex;gap:.3rem;margin-bottom:.5rem;flex-wrap:wrap}
.guide-editor .ge-toolbar .gt-btn{
  padding:.3rem .5rem;border-radius:6px;background:var(--bg);font-size:.78rem;
  border:1px solid var(--border);cursor:pointer;
}
.guide-editor .ge-toolbar .gt-btn:active{background:var(--primary-light)}

/* ========== 图片管理增强 V2 ========== */
.img-mgmt-bar{
  display:flex;gap:.4rem;margin-bottom:.6rem;flex-wrap:wrap;align-items:center;
}
.img-mgmt-bar .imb-info{font-size:.78rem;color:var(--text-light);margin-right:auto}
.img-mgmt-bar .btn{padding:.4rem .7rem;font-size:.78rem}

.img-toolbar{
  display:flex;gap:.4rem;align-items:center;flex-wrap:wrap;margin-bottom:.6rem;
}

.page-grid-item{
  position:relative;aspect-ratio:3/4;border-radius:8px;overflow:hidden;
  background:var(--bg);border:2px solid transparent;cursor:pointer;transition:border-color .15s;
}
.page-grid-item.has-img{border-color:var(--success)}
.page-grid-item.no-img{border-color:var(--border)}
.page-grid-item.selected{border-color:var(--danger);border-width:3px}
.page-grid-item.img-error{border-color:var(--warning)}
.page-grid-item img{width:100%;height:100%;object-fit:cover}

.page-grid-item .pgi-placeholder{
  width:100%;height:100%;display:flex;align-items:center;justify-content:center;
  font-size:.7rem;color:#bbb;cursor:pointer;background:repeating-linear-gradient(45deg,#f5f5f5,#f5f5f5 10px,#eee 10px,#eee 20px);
}
.page-grid-item .pgi-placeholder:active{background:var(--primary-light)}

.page-grid-item .pgi-num{
  position:absolute;bottom:0;left:0;right:0;
  background:rgba(0,0,0,.65);color:#fff;font-size:.68rem;text-align:center;padding:.12rem;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.page-grid-item .pgi-badge{
  position:absolute;top:2px;left:2px;
  font-size:.58rem;padding:1px 4px;border-radius:4px;color:#fff;font-weight:500;
  z-index:4;
}
.pgi-badge.custom{background:var(--primary)}
.pgi-badge.static{background:var(--success)}
.pgi-badge.none{background:#aaa}

.page-grid-item .pgi-check{
  position:absolute;top:4px;left:4px;
  width:22px;height:22px;border-radius:50%;
  border:2px solid #fff;background:rgba(0,0,0,.4);
  display:flex;align-items:center;justify-content:center;
  font-size:.7rem;color:#fff;z-index:6;
}
.page-grid-item .pgi-check.checked{background:var(--danger);border-color:#fff}

.page-grid-item .pgi-actions{
  position:absolute;top:2px;right:2px;display:flex;gap:2px;z-index:5;
}
.page-grid-item .pgi-actions .pa-btn{
  width:20px;height:20px;border-radius:4px;background:rgba(0,0,0,.6);color:#fff;
  font-size:.6rem;display:flex;align-items:center;justify-content:center;cursor:pointer;
}
.page-grid-item .pgi-actions .pa-btn:active{background:rgba(0,0,0,.85)}

/* 分页 */
.pagination{
  display:flex;gap:.4rem;justify-content:center;align-items:center;margin-top:.8rem;
  flex-wrap:wrap;
}

/* 统计卡片增强 */
.stat-card .sc-badge{
  display:inline-block;font-size:.65rem;padding:.1rem .4rem;border-radius:10px;
  margin-top:.2rem;
}
.stat-card .sc-badge.hot{background:#fff3e0;color:#e65100}

/* 图片预览灯箱 */
.image-lightbox{
  position:fixed;inset:0;z-index:500;background:rgba(0,0,0,.92);
  display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem 1rem;
}
.image-lightbox .lb-close{
  position:absolute;top:1rem;right:1.5rem;font-size:2.2rem;color:#fff;cursor:pointer;z-index:10;
  width:44px;height:44px;display:flex;align-items:center;justify-content:center;
}
.image-lightbox .lb-content{
  max-width:100%;max-height:80vh;overflow:auto;display:flex;align-items:center;justify-content:center;
}
.image-lightbox .lb-content img{
  max-width:100%;max-height:80vh;object-fit:contain;border-radius:8px;
}
.image-lightbox .lb-info{
  color:#fff;font-size:.9rem;margin-top:1rem;text-align:center;
}

/* 图片操作菜单（底部弹出） */
.image-action-menu{
  position:fixed;inset:0;z-index:500;display:flex;align-items:flex-end;justify-content:center;
}
.image-action-menu .iam-overlay{
  position:absolute;inset:0;background:rgba(0,0,0,.5);
}
.image-action-menu .iam-panel{
  position:relative;background:var(--card);border-radius:20px 20px 0 0;
  padding:1rem 1rem calc(1rem + var(--safe-bottom));width:100%;max-width:500px;z-index:1;
  animation:slideUp .25s ease;
}
@keyframes slideUp{from{transform:translateY(100%)}to{transform:translateY(0)}}
.image-action-menu .iam-title{
  font-size:1rem;font-weight:600;text-align:center;margin-bottom:.8rem;
  padding-bottom:.6rem;border-bottom:1px solid var(--border);
}
.image-action-menu .iam-btn{
  width:100%;padding:.75rem;text-align:left;font-size:.88rem;
  background:transparent;border:none;border-bottom:1px solid var(--border);
  color:var(--text);display:flex;align-items:center;gap:.5rem;cursor:pointer;
}
.image-action-menu .iam-btn:active{background:var(--bg)}
.image-action-menu .iam-btn.iam-cancel{
  text-align:center;color:var(--text-light);border-bottom:none;margin-top:.5rem;font-weight:500;
}

/* 响应式 */
@media(min-width:640px){
  .version-grid{grid-template-columns:repeat(3,1fr)}
  .grade-grid{grid-template-columns:repeat(6,1fr)}
  .page-grid{grid-template-columns:repeat(5,1fr)}
  .stat-grid{grid-template-columns:repeat(4,1fr)}
  .service-grid{grid-template-columns:repeat(4,1fr)}
}

/* ========== 图片管理：隐藏状态 ========== */
.page-grid-item.page-hidden{
  opacity:.5;background:repeating-linear-gradient(45deg,#f5f5f5,#f5f5f5 8px,#e9e9e9 8px,#e9e9e9 16px);
}
.page-grid-item.page-hidden img{display:none}
.page-grid-item .pgi-hidden-mark{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  color:#999;font-size:.8rem;font-weight:600;background:rgba(255,255,255,.6);
}
.page-grid-item .pgi-badge.hidden{background:#e74c3c;color:#fff}
.page-grid-item .pgi-badge.custom{background:#4A90D9;color:#fff}
.page-grid-item .pgi-badge.static{background:#27ae60;color:#fff}
.page-grid-item .pgi-badge.none{background:#95a5a6;color:#fff}
.pa-btn.pa-btn-primary{background:var(--primary)!important}

/* 缩略图条：隐藏状态 */
.thumb-item.thumb-hidden{
  opacity:.4;background:repeating-linear-gradient(45deg,#333,#333 4px,#444 4px,#444 8px);
  position:relative;
}
.thumb-item .thumb-hidden-mark{
  position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  background:rgba(0,0,0,.7);color:#fff;font-size:.55rem;padding:1px 4px;border-radius:3px;z-index:2;
}

/* ========== 引导页编辑器 ========== */
.ge-status-bar{
  display:flex;justify-content:space-between;align-items:center;
  padding:.5rem .8rem;background:var(--bg);border-radius:8px;margin-bottom:.6rem;
}
.ge-status-info{font-size:.85rem}
.ge-tag{display:inline-block;padding:.15rem .5rem;border-radius:4px;font-size:.75rem;margin-left:.3rem}
.ge-tag-on{background:#d4edda;color:#155724}
.ge-tag-off{background:#fff3cd;color:#856404}
.ge-tag-new{background:#cce5ff;color:#004085}
.ge-toolbar-label{font-size:.8rem;color:var(--text-light);margin-right:.3rem;font-weight:500}
.ge-split{display:grid;grid-template-columns:1fr;gap:.6rem;margin-top:.4rem}
@media(min-width:900px){.ge-split{grid-template-columns:1fr 1fr}}
.ge-preview-box{border:2px solid var(--border);border-radius:10px;background:#fff;overflow:hidden;display:flex;flex-direction:column}
.ge-preview-label{font-size:.75rem;color:var(--text-light);padding:.4rem .6rem;background:#f8f9fa;border-bottom:1px solid var(--border);text-align:center}
.ge-preview{padding:.8rem;overflow:auto;flex:1;min-height:240px;max-height:380px;font-size:.9rem;line-height:1.7}
.ge-callout{
  background:linear-gradient(135deg,#fff3e0,#ffe0b2);
  border-left:4px solid #ff9800;
  padding:.8rem 1rem;margin:.6rem 0;border-radius:0 8px 8px 0;
}
.ge-cta-btn{
  display:inline-block;background:linear-gradient(135deg,#ff6b6b,#ee5a6f);
  color:#fff!important;text-decoration:none;padding:.7rem 1.5rem;
  border-radius:25px;font-weight:600;margin:.5rem .3rem;
  box-shadow:0 4px 12px rgba(238,90,111,.3);
}

/* ========== 图片操作菜单：状态展示 ========== */
.image-action-menu .iam-status{
  padding:.5rem .8rem;border-radius:8px;font-size:.8rem;margin-bottom:.6rem;
  text-align:center;font-weight:500;
}
.image-action-menu .iam-status.iam-status-hidden{background:#fde8e8;color:#c0392b;border:1px solid #f5b7b1}
.image-action-menu .iam-status.iam-status-shown{background:#d4edda;color:#155724;border:1px solid #a3d9a5}
.image-action-menu .iam-btn.iam-btn-primary{background:var(--primary-light);color:var(--primary);font-weight:600}
.image-action-menu .iam-divider{height:1px;background:var(--border);margin:.5rem 0}

/* ========== 快速操作按钮悬停 ========== */
.pa-btn{cursor:pointer;transition:transform .15s}
.pa-btn:active{transform:scale(.9)}

/* ========== 图片管理增强 v3 ========== */

/* 拖拽排序 */
.page-grid-item.dragging{opacity:.4;transform:scale(.95)}
.page-grid-item.drag-over{
  border:3px dashed var(--primary)!important;
  background:var(--primary-light)!important;
  transform:scale(1.05);
  transition:all .15s;
}

/* 网格大小切换 */
.grid-size-switch{display:flex;gap:2px;border:1.5px solid var(--border);border-radius:8px;overflow:hidden}
.gs-btn{
  padding:.3rem .5rem;border:none;background:#f8f9fa;cursor:pointer;
  font-size:.85rem;color:var(--text-light);transition:all .15s;
}
.gs-btn.active{background:var(--primary);color:#fff}
.gs-btn:hover:not(.active){background:#e9ecef}

/* 网格大小变体 */
.page-grid.grid-compact{grid-template-columns:repeat(auto-fill,minmax(70px,1fr));gap:.3rem}
.page-grid.grid-standard{grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:.5rem}
.page-grid.grid-large{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:.6rem}

.page-grid-item.grid-compact{height:95px}
.page-grid-item.grid-standard{height:140px}
.page-grid-item.grid-large{height:210px}

.page-grid-item.grid-compact .pgi-num{font-size:.6rem;padding:1px 3px}
.page-grid-item.grid-compact .pgi-badge{font-size:.55rem;padding:1px 4px}
.page-grid-item.grid-compact .pa-btn{width:18px;height:18px;font-size:.55rem}
.page-grid-item.grid-compact .pgi-actions{gap:1px}
.page-grid-item.grid-large .pgi-num{font-size:.85rem;padding:3px 6px}
.page-grid-item.grid-large .pgi-badge{font-size:.7rem;padding:2px 6px}
.page-grid-item.grid-large .pa-btn{width:26px;height:26px;font-size:.75rem}

/* 图片信息显示 */
.pgi-badges{position:absolute;bottom:0;left:0;right:0;display:flex;justify-content:space-between;align-items:center;padding:0 2px}
.pgi-size{
  font-size:.6rem;color:rgba(255,255,255,.8);background:rgba(0,0,0,.5);
  padding:1px 4px;border-radius:3px;
}

/* 占位符改进 */
.pgi-placeholder{
  width:100%;height:100%;display:flex;flex-direction:column;
  align-items:center;justify-content:center;
  background:repeating-linear-gradient(45deg,#f8f9fa,#f8f9fa 10px,#e9ecef 10px,#e9ecef 20px);
  color:var(--text-light);cursor:pointer;transition:all .2s;
}
.pgi-placeholder:hover{background:var(--primary-light);color:var(--primary)}
.pgi-placeholder span{font-size:1.8rem;font-weight:300}
.pgi-placeholder small{font-size:.65rem;margin-top:.2rem}

/* 图片管理操作区 */
.img-mgmt-actions{display:flex;gap:.3rem;align-items:center;flex-wrap:wrap}

/* 上传进度条 */
.upload-progress-bar{
  position:relative;background:#f0f0f0;border-radius:8px;
  overflow:hidden;padding:.5rem .8rem;min-height:32px;
  display:flex;align-items:center;
}
.upload-progress-bar .upb-fill{
  position:absolute;left:0;top:0;bottom:0;
  background:linear-gradient(90deg,var(--primary-light),var(--primary));
  transition:width .3s;opacity:.3;
}
.upload-progress-bar .upb-text{
  position:relative;z-index:1;font-size:.8rem;color:var(--text);
  white-space:nowrap;
}

/* ========== 课本管理卡片 ========== */
.book-list{display:flex;flex-direction:column;gap:.5rem}
.book-card{
  display:flex;align-items:center;justify-content:space-between;
  padding:.7rem;border:2px solid var(--border);border-radius:12px;
  background:#fff;transition:all .2s;
}
.book-card:hover{border-color:var(--primary);box-shadow:0 2px 8px rgba(0,0,0,.06)}
.book-card.disabled{opacity:.55;background:#f8f9fa}
.bc-info{flex:1;min-width:0}
.bc-title{font-weight:600;font-size:.9rem;margin-bottom:.2rem}
.bc-meta{display:flex;gap:.3rem;flex-wrap:wrap}
.bc-tag{
  display:inline-block;font-size:.68rem;padding:.15rem .5rem;
  border-radius:10px;background:#e9ecef;color:var(--text-light);
}
.bc-tag.tag-blue{background:#e3f2fd;color:#1565c0}
.bc-tag.tag-orange{background:#fff3e0;color:#e65100}
.bc-tag.tag-green{background:#e8f5e9;color:#2e7d32}
.bc-tag.tag-red{background:#fde8e8;color:#c0392b}
.bc-tag.tag-gray{background:#f5f5f5;color:#999}
.bc-actions{display:flex;gap:.25rem;flex-shrink:0}

/* 灯箱增强 */
.image-lightbox img{max-width:92vw;max-height:85vh;border-radius:8px;box-shadow:0 8px 32px rgba(0,0,0,.3)}
.image-lightbox .lb-info{
  position:fixed;bottom:1rem;left:50%;transform:translateX(-50%);
  background:rgba(0,0,0,.7);color:#fff;padding:.4rem 1rem;
  border-radius:20px;font-size:.85rem;
}

/* 响应式补充 */
@media(max-width:480px){
  .page-grid.grid-compact{grid-template-columns:repeat(auto-fill,minmax(60px,1fr))}
  .page-grid.grid-large{grid-template-columns:repeat(auto-fill,minmax(130px,1fr))}
  .bc-actions{flex-wrap:wrap}
}