/* ==================== 基础重置 ==================== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;-webkit-tap-highlight-color:transparent}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  color:#1a1a1a;background:#f7f7f7;line-height:1.6;
  padding-bottom:70px;
  -webkit-font-smoothing:antialiased
}
a{text-decoration:none;color:inherit}
button{font-family:inherit;border:none;background:none;cursor:pointer}

/* ==================== 容器 ==================== */
.page-container{
  max-width:640px;margin:0 auto;padding:16px;
}
.page-header{
  text-align:center;margin-bottom:24px;
}
.page-header h2{font-size:22px;font-weight:600;margin-bottom:4px}
.page-header p{color:#666;font-size:14px}

/* ==================== Header ==================== */
.header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:#fff;border-bottom:1px solid #e5e5e5;
  height:50px;
}
.header-inner{
  max-width:1200px;margin:0 auto;padding:0 16px;
  height:100%;display:flex;align-items:center;justify-content:space-between;
}
.logo{display:flex;align-items:center;gap:8px;cursor:pointer}
.logo-icon{font-size:24px}
.logo-text{display:flex;flex-direction:column;line-height:1.2}
.logo-main{font-size:14px;font-weight:600}
.logo-sub{font-size:11px;color:#999}
.nav{display:none;gap:24px}
.nav-item{
  font-size:14px;color:#666;cursor:pointer;padding:4px 0;
  border-bottom:2px solid transparent;transition:.2s
}
.nav-item.active,.nav-item:hover{color:#07c160;border-color:#07c160}
.nav-actions{display:flex;align-items:center;gap:8px}
.btn-teacher{
  padding:6px 12px;font-size:12px;border-radius:4px;
  background:#f0f0f0;color:#666;
}
.btn-teacher:hover{background:#e0e0e0}
.hamburger{font-size:20px;padding:8px;cursor:pointer}

/* ==================== 按钮 ==================== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:10px 20px;font-size:14px;font-weight:500;border-radius:6px;
  transition:.2s;cursor:pointer;
}
.btn-primary{background:#07c160;color:#fff}
.btn-primary:active{background:#06ad56}
.btn-secondary{background:#f5f5f5;color:#333}
.btn-secondary:active{background:#eee}
.btn-ghost{border:1px solid #ddd;background:#fff;color:#333}
.btn-full{width:100%}
.btn-sm{padding:6px 12px;font-size:13px}
.weui-btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 20px;font-size:14px;font-weight:500;border-radius:6px;transition:.2s;cursor:pointer}
.weui-btn_primary{background:#07c160;color:#fff;border:none}
.weui-btn_primary:active{background:#06ad56}
.weui-btn_default{background:#f5f5f5;color:#333;border:none}
.weui-btn_warn{background:#fa5151;color:#fff;border:none}

/* ==================== 表单 ==================== */
.weui-form{margin-top:20px}
.weui-form__control-group{margin-bottom:16px}
.weui-form__label{font-size:14px;color:#333;margin-bottom:8px;display:block}
.weui-form__control{}
.weui-input{
  width:100%;padding:12px;font-size:14px;border:1px solid #e5e5e5;
  border-radius:6px;background:#fff;outline:none;
}
.weui-input:focus{border-color:#07c160}
.weui-textarea{
  width:100%;padding:12px;font-size:14px;border:1px solid #e5e5e5;
  border-radius:6px;background:#fff;outline:none;resize:vertical;
}
.weui-textarea:focus{border-color:#07c160}
.weui-form__tips{font-size:13px;color:#999;margin:12px 0}
.weui-form__btn{display:flex;gap:12px;margin-top:24px}
.weui-form__btn .weui-btn{flex:1}
.weui-form__link{text-align:center;margin-top:16px;font-size:14px;color:#666}
.weui-form__link a{color:#07c160}
select.weui-input{appearance:none;background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23999' d='M6 8L1 3h10z'/%3E%3C/svg%3E") no-repeat right 12px center}

/* ==================== Hero ==================== */
.hero{
  padding:80px 16px 40px;text-align:center;
  background:linear-gradient(135deg,#e8f5e9 0%,#f1f8e9 100%);
}
.hero-badge{
  display:inline-block;padding:6px 16px;font-size:13px;
  background:#fff;color:#07c160;border-radius:20px;margin-bottom:16px;
}
.hero-title{font-size:26px;font-weight:700;line-height:1.3;margin-bottom:12px}
.gradient{color:#07c160}
.hero-desc{font-size:14px;color:#666;margin-bottom:24px}
.hero-actions{display:flex;gap:12px;justify-content:center}

/* ==================== 统计栏 ==================== */
.stats-bar{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
  background:#e5e5e5;margin:16px 0;
}
.stat-card{
  background:#fff;padding:16px 8px;text-align:center;
}
.stat-icon{font-size:20px;margin-bottom:4px}
.stat-num{font-size:20px;font-weight:700;color:#07c160}
.stat-label{font-size:12px;color:#999;margin-top:4px}

/* ==================== 区域 ==================== */
.section{margin:24px 16px}
.section-header{
  display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;
}
.section-title{font-size:18px;font-weight:600}
.section-title-icon{margin-right:6px}
.btn-secondary{background:#f5f5f5}

/* ==================== 问答列表 ==================== */
.qa-grid{display:grid;gap:12px}
.qa-list{display:flex;flex-direction:column;gap:12px}
.qa-item{
  background:#fff;border-radius:8px;padding:16px;cursor:pointer;
  box-shadow:0 1px 3px rgba(0,0,0,.06);transition:.2s;
}
.qa-item:active{transform:scale(.99);background:#f9f9f9}
.qa-item-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:10px}
.qa-category{font-size:11px;padding:2px 8px;border-radius:10px;background:#f0f0f0;color:#666}
.qa-status{font-size:11px;padding:2px 8px;border-radius:10px}
.qa-status.answered{background:#e8f5e9;color:#07c160}
.qa-status.pending{background:#fff3e0;color:#ff9800}
.qa-title{font-size:15px;font-weight:500;margin-bottom:8px;line-height:1.4}
.qa-meta{font-size:12px;color:#999;display:flex;gap:12px;flex-wrap:wrap}
.qa-preview{font-size:13px;color:#666;margin-top:8px;line-height:1.5;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ==================== 搜索栏 ==================== */
.weui-search-bar{
  background:#fff;padding:8px 12px;border-radius:8px;margin-bottom:12px;
  box-shadow:0 1px 3px rgba(0,0,0,.05);
}
.weui-search-bar__box{
  display:flex;align-items:center;background:#f5f5f5;border-radius:6px;padding:8px 12px;
}
.weui-search-bar__input{
  flex:1;border:none;background:none;outline:none;font-size:14px;
}
.weui-icon-clear{color:#ccc;font-size:14px}
.filter-bar{
  display:flex;gap:8px;overflow-x:auto;padding-bottom:8px;
  -webkit-overflow-scrolling:touch;
}
.filter-btn{
  flex-shrink:0;padding:6px 14px;font-size:13px;border-radius:16px;
  background:#fff;color:#666;cursor:pointer;transition:.2s;
}
.filter-btn.active{background:#07c160;color:#fff}
.filter-btn:active{opacity:.8}

/* ==================== 弹窗 - WeUI风格 ==================== */
.weui-modal{
  position:fixed;top:0;left:0;right:0;bottom:0;z-index:1000;
  display:none;flex-direction:column;justify-content:flex-end;
  background:rgba(0,0,0,.5);
}
.weui-modal.weui-android-modal{opacity:1;visibility:visible;display:flex}
.weui-modal__bd{
  background:#fff;border-radius:16px 16px 0 0;padding:20px;
  max-height:85vh;overflow-y:auto;margin-bottom:env(safe-area-inset-bottom);
}
.qa-modal-header{margin-bottom:16px;padding-bottom:16px;border-bottom:1px solid #eee}
.qa-modal-title{font-size:18px;font-weight:600;margin-bottom:8px}
.qa-content-box{font-size:14px;line-height:1.7;color:#333;margin:12px 0}
.qa-answer-label{
  font-size:13px;font-weight:600;color:#07c160;margin:16px 0 8px;
  padding-top:16px;border-top:1px solid #eee;
}
.qa-answer-content{font-size:14px;line-height:1.7;color:#333}
.weui-modal__ft{
  background:#fff;padding:16px;text-align:center;
  border-top:1px solid #e5e5e5;
}
.weui-modal__btn{
  display:inline-block;padding:12px 32px;font-size:16px;color:#07c160;
}
.modal-overlay{
  position:fixed;top:0;left:0;right:0;bottom:0;z-index:1000;
  display:none;background:rgba(0,0,0,.5);
  align-items:center;justify-content:center;padding:20px;
}
.modal-overlay.active{display:flex}
.modal{
  background:#fff;border-radius:12px;max-width:500px;width:100%;
  animation:modalIn .25s ease;
}
@keyframes modalIn{from{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}
.modal-header{
  display:flex;justify-content:space-between;align-items:center;
  padding:16px 20px;border-bottom:1px solid #eee;
}
.modal-header h3{font-size:16px;font-weight:600}
.modal-close{font-size:20px;color:#999;padding:4px;cursor:pointer}
.modal-body{padding:20px}
.modal-footer{
  display:flex;gap:12px;padding:16px 20px;
  border-top:1px solid #eee;justify-content:flex-end;
}

/* ==================== 个人中心 ==================== */
.profile-card{background:#fff;border-radius:12px;overflow:hidden;margin-bottom:20px}
.weui-panel__bd{padding:20px}
.weui-media-box{display:flex;align-items:center;gap:12px}
.weui-media-box__hd{width:50px;height:50px;display:flex;align-items:center;justify-content:center}
.profile-avatar{width:50px;height:50px;background:#f0f0f0;border-radius:50%;
  display:flex;align-items:center;justify-content:center;font-size:24px}
.weui-media-box__bd{flex:1}
.profile-name{font-size:16px;font-weight:600}
.profile-contact{font-size:13px;color:#999;margin-top:4px}
.weui-panel__ft{padding:0 20px 20px}
.profile-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;padding:16px 0}
.profile-item{}
.profile-label{font-size:12px;color:#999;margin-bottom:4px}
.profile-value{font-size:14px;font-weight:500}
.profile-status.active{color:#07c160}
.profile-days.active{color:#07c160;font-weight:600}
.profile-section-header{padding:0 0 12px}
.profile-section-header h3{font-size:16px;font-weight:600}
.profile-questions-list{display:flex;flex-direction:column;gap:12px}

/* ==================== 管理员后台 ==================== */
.teacher-layout{display:flex;min-height:100vh}
.teacher-sidebar{
  width:200px;background:#1a1a2e;color:#fff;display:flex;flex-direction:column;
  position:fixed;left:0;top:0;bottom:0;
}
.sidebar-top{display:flex;align-items:center;gap:10px;padding:20px;border-bottom:1px solid rgba(255,255,255,.1)}
.sidebar-logo{font-size:28px}
.sidebar-brand{font-size:16px;font-weight:600}
.sidebar-sub{font-size:12px;opacity:.7}
.sidebar-nav{flex:1;padding:12px 0}
.si{
  display:flex;align-items:center;gap:10px;padding:12px 20px;
  cursor:pointer;transition:.2s;position:relative;
}
.si:hover{background:rgba(255,255,255,.1)}
.si.active{background:rgba(7,193,96,.3);border-left:3px solid #07c160}
.si-icon{font-size:18px}
.si-badge{
  position:absolute;right:16px;background:#fa5151;color:#fff;
  font-size:11px;padding:2px 6px;border-radius:10px;
}
.si-badge-new{background:#ff9800}
.si-divider{height:1px;background:rgba(255,255,255,.1);margin:8px 0}
.sidebar-bottom{padding:12px;border-top:1px solid rgba(255,255,255,.1)}
.sidebar-bottom .btn{color:#fff;border-color:rgba(255,255,255,.3)}
.teacher-main{flex:1;margin-left:200px;padding:20px;background:#f5f5f5}
.teacher-topbar{
  display:flex;justify-content:space-between;align-items:center;
  margin-bottom:20px;
}
.teacher-topbar h2{font-size:20px;font-weight:600}
.teacher-search{
  display:flex;align-items:center;gap:8px;
  background:#fff;padding:8px 12px;border-radius:6px;
}
.teacher-search input{border:none;outline:none;font-size:14px;width:200px}
.teacher-body{display:grid;gap:12px}
.answer-panel{
  width:400px;background:#fff;padding:20px;display:none;
  border-left:1px solid #ddd;position:fixed;right:0;top:0;bottom:0;
}
.answer-panel.active{display:block}
.ap-header{
  display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;
}
.ap-header h3{font-size:16px;font-weight:600}
.ap-close{font-size:18px;color:#999;cursor:pointer}
.ap-question{background:#f9f9f9;padding:16px;border-radius:8px;margin-bottom:16px}
.ap-editor{}
.ap-actions{
  display:flex;gap:12px;margin-top:16px;
}
.ref-section{margin-top:16px}
.ref-header{
  display:flex;justify-content:space-between;align-items:center;
  padding:12px;background:#f5f5f5;border-radius:6px;cursor:pointer;
}
.ref-panel{background:#fafafa;padding:12px;margin-top:8px;border-radius:6px}
.ref-list{max-height:200px;overflow-y:auto}
.ref-item{padding:10px;background:#fff;margin-bottom:8px;border-radius:4px;cursor:pointer}
.ref-item:hover{background:#f0f0f0}

/* ==================== 激活码 ==================== */
.codes-toolbar{display:flex;gap:12px;margin-bottom:16px}
.codes-list,.members-list{display:flex;flex-direction:column;gap:8px}
.code-item{
  display:flex;justify-content:space-between;align-items:center;
  background:#fff;padding:12px 16px;border-radius:8px;
}
.code-value{font-family:monospace;font-size:15px;font-weight:600;letter-spacing:1px}
.code-status{font-size:12px;padding:3px 10px;border-radius:10px}
.code-status.unused{background:#e8f5e9;color:#07c160}
.code-status.used{background:#f5f5f5;color:#999}

/* ==================== 底部导航 - 核心WeUI TabBar ==================== */
.mobile-nav{
  position:fixed;bottom:0;left:0;right:0;z-index:500;
  display:flex;background:#fafafa;
  border-top:1px solid #e5e5e5;
  padding-bottom:env(safe-area-inset-bottom,0);
  padding-top:6px;
}
.mobile-nav-item{
  flex:1;display:flex;flex-direction:column;
  align-items:center;gap:2px;
  padding:6px 0;
  color:#999;font-size:10px;
  cursor:pointer;transition:.2s;
}
.mobile-nav-item:active{transform:.95}
.mobile-nav-item.active{color:#07c160}
.nav-icon{font-size:20px;line-height:1}
.nav-text{line-height:1.2}

/* ==================== 其他 ==================== */
.empty-state{text-align:center;padding:60px 20px;color:#999}
.empty-state p{margin:16px 0}
.paywall-banner{
  background:linear-gradient(135deg,#e8f5e9 0%,#c8e6c9 100%);
  border-radius:12px;padding:20px;margin:16px 0;
}
.paywall-content{display:flex;align-items:center;gap:16px}
.paywall-icon{font-size:32px}
.paywall-text{flex:1}
.paywall-text strong{font-size:14px}
.paywall-text p{font-size:12px;opacity:.8;margin-top:4px}
.load-more-wrap{text-align:center;padding:20px}
.toast{
  position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);
  background:rgba(0,0,0,.8);color:#fff;padding:12px 24px;
  border-radius:8px;font-size:14px;z-index:9999;display:none;
}
.toast.active{display:block}
.sq-preview-badge{
  display:inline-block;font-size:11px;padding:2px 8px;
  background:#fff3e0;color:#ff9800;border-radius:10px;margin-left:8px;
}
.image-previews{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.image-preview{
  width:80px;height:80px;border-radius:6px;overflow:hidden;
  position:relative;
}
.image-preview img{width:100%;height:100%;object-fit:cover}
.query-results{margin-top:20px}

/* ==================== 响应式 - PC端隐藏移动端元素 ==================== */
@media (min-width:769px){
  .mobile-nav{display:none!important}
  body{padding-bottom:0}
  .nav{display:flex}
  .hamburger{display:none}
  .header{position:relative}
  .hero{padding:60px 16px 40px}
  .stats-bar{max-width:640px;margin:16px auto}
  .section{max-width:640px;margin:24px auto}
  .page-container{max-width:960px}
  .qa-grid{grid-template-columns:repeat(2,1fr)}
  .teacher-sidebar{position:relative;height:100vh}
  .teacher-main{margin-left:200px}
}

/* ==================== 移动端优化 ==================== */
@media (max-width:768px){
  .page-container{padding:12px}
  .hero{padding:70px 16px 30px}
  .hero-title{font-size:22px}
  .hero-actions{flex-direction:column}
  .hero-actions .btn{width:100%}
  .stats-bar{grid-template-columns:repeat(2,1fr)}
  .section{margin:16px 12px}
  .qa-item{padding:14px}
  .weui-form__btn{flex-direction:column}
  .weui-form__btn .weui-btn{width:100%}
  .profile-grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .login-card{max-width:100%}
  .modal{width:calc(100% - 32px);max-height:90vh}
  .modal-body{padding:16px}
  .filter-bar::-webkit-scrollbar{display:none}
}

/* ==================== iPhone安全区域 ==================== */
@supports (padding-bottom: env(safe-area-inset-bottom)){
  .mobile-nav{
    padding-bottom: calc(6px + env(safe-area-inset-bottom));
  }
}

/* ==================== WeUI 核心样式内联 ==================== */
.weui-btn{
  display:block;width:100%;border:none;outline:none;
  font-size:17px;text-align:center;color:#fff;
  background-color:#07c160;line-height:2.55555556;
  border-radius:4px;overflow:hidden;padding:0 14px;
  -webkit-tap-highlight-color:rgba(0,0,0,0);
}
.weui-btn:active{background-color:#06ad56}
.weui-btn.weui-btn_primary{background-color:#07c160}
.weui-btn.weui-btn_default{background-color:#f8f8f8;color:#000;border:1px solid #cdcdcd}
.weui-btn.weui-btn_warn{background-color:#fa5151}
.weui-btn.weui-btn_disabled{color:rgba(0,0,0,.3);background-color:#f7f7f7}

.weui-input{
  width:100%;height:44px;padding:10px 15px;
  font-size:17px;background:#fff;border:none;outline:none;
  -webkit-appearance:none;appearance:none;
}
.weui-input:focus{-webkit-tap-highlight-color:rgba(0,0,0,0)}
textarea.weui-textarea{
  width:100%;padding:10px 15px;font-size:17px;
  background:#fff;border:none;outline:none;
  -webkit-appearance:none;appearance:none;resize:none;
}

.weui-panel{background:#fff}
.weui-panel__bd{padding:15px}
.weui-media-box{position:relative;padding:15px;display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center}
.weui-media-box__hd{-webkit-flex-shrink:0;flex-shrink:0;margin-right:10px;width:50px;height:50px}
.weui-media-box__bd{-webkit-box-flex:1;-webkit-flex:1;flex:1;min-width:0}
.weui-media-box__title{font-weight:400;font-size:17px;width:auto;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;word-wrap:normal;word-wrap:break-word;word-break:break-all}
.weui-media-box__desc{color:#999;font-size:13px;line-height:1.4;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;margin-top:3px}

.weui-search-bar{position:relative;padding:8px 10px;display:-webkit-box;display:-webkit-flex;display:flex;box-sizing:border-box;background-color:#efeff4}
.weui-search-bar__form{position:relative;-webkit-box-flex:1;-webkit-flex:auto;flex:auto;background-color:#ebebeb;border-radius:4px}
.weui-search-bar__box{position:relative;padding-left:30px;padding-right:30px;height:100%;width:100%;box-sizing:border-box;z-index:1}
.weui-search-bar__input{margin:0;padding:4px 0;width:100%;height:32px;border:none;outline:none;font-size:17px;line-height:32px;background:transparent;box-sizing:border-box}
.weui-icon-clear{position:absolute;top:0;right:0;padding:4px 8px;font-size:0;color:rgba(0,0,0,.5)}

.weui-toast{position:fixed;z-index:9999;max-width:80%;top:50%;left:50%;transform:translate(-50%,-50%);background:rgba(0,0,0,.8);color:#fff;padding:12px 24px;border-radius:8px;font-size:14px;text-align:center;line-height:1.4}