:root{
  --wx-green:#07c160;
  --wx-green-d:#06ad56;
  --blue:#576b95;
  --bg:#f2f2f6;
  --card:#ffffff;
  --line:#e6e6ea;
  --text:#1a1a1a;
  --text-2:#8a8a90;
  --danger:#e5534b;
  --warn:#f0a020;
  --radius:12px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
html,body{margin:0;padding:0;height:100%;background:#dfe1e6;
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Helvetica Neue","Microsoft YaHei",sans-serif;
  color:var(--text);font-size:15px;}

/* 手机外框：桌面上居中显示为手机；手机上全屏 */
#phone{
  width:100%;max-width:420px;height:100%;max-height:900px;
  margin:0 auto;background:var(--bg);display:flex;flex-direction:column;
  position:relative;overflow:hidden;
}
@media(min-width:640px){
  body{display:flex;align-items:center;justify-content:center;}
  #phone{border-radius:28px;box-shadow:0 20px 60px rgba(0,0,0,.28);height:860px;}
}

.statusbar{
  height:30px;flex:0 0 30px;display:flex;align-items:center;justify-content:space-between;
  padding:0 16px;font-size:12px;color:#fff;background:#3c3c46;font-weight:500;
}
.dots{letter-spacing:1px;font-size:9px;}

.navbar{
  flex:0 0 48px;background:#3c3c46;color:#fff;display:flex;align-items:center;
  padding:0 12px;gap:6px;position:relative;
}
#nav-title{font-size:17px;font-weight:600;flex:1;text-align:center;}
.nav-back{background:none;border:none;color:#fff;font-size:26px;line-height:1;
  cursor:pointer;padding:0 6px;margin-top:-4px;}
.nav-role{font-size:11px;background:var(--wx-green);padding:2px 8px;border-radius:10px;
  position:absolute;right:12px;}
.hidden{display:none!important;}

main{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:12px 12px 16px;}

/* 卡片 */
.card{background:var(--card);border-radius:var(--radius);padding:14px;margin-bottom:10px;}
.card-title{font-size:14px;font-weight:600;margin-bottom:10px;display:flex;
  align-items:center;justify-content:space-between;}
.muted{color:var(--text-2);font-size:13px;}
.tiny{font-size:12px;color:var(--text-2);}

/* 角色选择 */
.role-hero{text-align:center;padding:26px 16px 18px;}
.role-hero h1{font-size:22px;margin:0 0 6px;}
.role-hero p{color:var(--text-2);font-size:13px;margin:0 0 22px;line-height:1.6;}
.role-btn{display:flex;align-items:center;gap:14px;width:100%;background:#fff;border:none;
  border-radius:var(--radius);padding:16px;margin-bottom:10px;cursor:pointer;
  text-align:left;font-family:inherit;font-size:15px;color:var(--text);
  transition:transform .12s;}
.role-btn:active{transform:scale(.98);}
.role-ico{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;
  justify-content:center;font-size:22px;flex:0 0 44px;}
.role-btn b{display:block;font-size:15px;margin-bottom:2px;}
.role-btn span{font-size:12px;color:var(--text-2);}
.role-arrow{margin-left:auto;color:#c8c8ce;font-size:20px;}

/* 标签 */
.tag{display:inline-block;font-size:11px;padding:2px 8px;border-radius:8px;
  font-weight:500;white-space:nowrap;}
.t-submitted{background:#fff3e0;color:#d98200;}
.t-teacher_ok{background:#e3f0ff;color:#2b7fd4;}
.t-done{background:#e6f7ec;color:var(--wx-green-d);}
.t-rejected{background:#fdeceb;color:var(--danger);}
.t-none{background:#eeeef2;color:#999;}
.t-jiaowu{background:#f3e8ff;color:#8e5bd8;}

/* 确认任务行 */
.task-row{display:flex;align-items:center;gap:10px;padding:9px 0;
  border-bottom:1px solid var(--line);}
.task-row:last-child{border-bottom:none;}
.task-ico{width:32px;height:32px;border-radius:9px;flex:0 0 32px;display:flex;
  align-items:center;justify-content:center;font-size:13px;font-weight:600;
  background:#fff3e0;color:#d98200;}
.task-ico.ok{background:#e6f7ec;color:var(--wx-green-d);}
.task-ico.no{background:#fdeceb;color:var(--danger);}
.task-ico.parent{background:#e3f0ff;color:#2b7fd4;}

/* 学生列表 */
.stu-item{display:flex;align-items:center;gap:12px;padding:12px 14px;background:#fff;
  border-radius:var(--radius);margin-bottom:8px;cursor:pointer;}
.stu-item:active{background:#fafafa;}
.avatar{width:38px;height:38px;border-radius:50%;background:var(--wx-green);
  color:#fff;display:flex;align-items:center;justify-content:center;
  font-size:14px;font-weight:600;flex:0 0 38px;}
.stu-main{flex:1;min-width:0;}
.stu-main b{font-size:15px;display:block;}
.stu-main span{font-size:12px;color:var(--text-2);}

/* 表单 */
.field{margin-bottom:14px;}
.field label{display:block;font-size:13px;color:var(--text-2);margin-bottom:6px;}
.field input,.field select,.field textarea{
  width:100%;border:1px solid var(--line);border-radius:8px;padding:10px 12px;
  font-size:15px;font-family:inherit;background:#fff;color:var(--text);}
.field textarea{resize:vertical;min-height:60px;}
.field input:focus,.field textarea:focus,.field select:focus{
  outline:none;border-color:var(--wx-green);}
.subj-row{display:flex;gap:8px;margin-bottom:8px;align-items:center;}
.subj-row input:first-child{flex:0 0 34%;}
.subj-row input:nth-child(2){flex:1;}
.icon-btn{background:none;border:none;color:#c0c0c6;font-size:20px;cursor:pointer;
  padding:0 4px;line-height:1;flex:0 0 auto;}
.icon-btn.del:active{color:var(--danger);}

.btn{display:block;width:100%;border:none;border-radius:10px;padding:13px;
  font-size:16px;font-weight:600;font-family:inherit;cursor:pointer;
  background:var(--wx-green);color:#fff;transition:opacity .15s;}
.btn:active{opacity:.85;}
.btn.ghost{background:#fff;color:var(--text);border:1px solid var(--line);}
.btn.danger{background:var(--danger);}
.btn.sm{padding:9px;font-size:14px;}
.btn-row{display:flex;gap:10px;margin-top:12px;}

/* 目标明细 */
.goal-item{display:flex;justify-content:space-between;padding:9px 0;
  border-bottom:1px solid var(--line);font-size:14px;}
.goal-item:last-child{border-bottom:none;}
.goal-item b{font-weight:600;}
.goal-item span{color:var(--blue);font-weight:500;}

/* 时间线 */
.tl{position:relative;padding-left:22px;}
.tl::before{content:'';position:absolute;left:5px;top:6px;bottom:6px;width:2px;
  background:var(--line);}
.tl-item{position:relative;padding-bottom:14px;}
.tl-item:last-child{padding-bottom:0;}
.tl-item::before{content:'';position:absolute;left:-21px;top:5px;width:10px;height:10px;
  border-radius:50%;background:#c8c8ce;border:2px solid #fff;}
.tl-item.on::before{background:var(--wx-green);}
.tl-item.no::before{background:var(--danger);}
.tl-item b{font-size:14px;display:block;}
.tl-item span{font-size:12px;color:var(--text-2);}

/* 群聊 */
.chat-head{background:#fff;border-radius:var(--radius);padding:12px 14px;margin-bottom:10px;
  display:flex;align-items:center;gap:10px;}
.chat-body{background:#ededed;border-radius:var(--radius);padding:12px;min-height:200px;}
.msg{display:flex;gap:8px;margin-bottom:14px;}
.msg-av{width:34px;height:34px;border-radius:6px;flex:0 0 34px;display:flex;
  align-items:center;justify-content:center;font-size:13px;font-weight:600;color:#fff;}
.msg-main{flex:1;min-width:0;}
.msg-name{font-size:11px;color:var(--text-2);margin-bottom:4px;}
.bubble{background:#fff;border-radius:8px;padding:10px 12px;font-size:14px;
  line-height:1.55;white-space:pre-wrap;word-break:break-word;display:inline-block;
  max-width:100%;}
.bubble.card-msg{background:#fff;border-left:3px solid var(--wx-green);}
.bubble.sys{background:#fafaf5;color:#b8860b;font-size:13px;font-style:normal;}
.msg.center{justify-content:center;}
.msg.center .bubble{background:rgba(0,0,0,.06);color:#888;font-size:12px;}

/* 统计 */
.stat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-bottom:10px;}
.stat{background:#fff;border-radius:var(--radius);padding:14px;text-align:center;}
.stat b{display:block;font-size:24px;font-weight:700;margin-bottom:2px;}
.stat span{font-size:12px;color:var(--text-2);}
.stat.green b{color:var(--wx-green);}
.stat.blue b{color:var(--blue);}
.stat.orange b{color:var(--warn);}
.stat.red b{color:var(--danger);}
.progress{height:8px;background:#eeeef2;border-radius:4px;overflow:hidden;margin-top:8px;}
.progress i{display:block;height:100%;background:var(--wx-green);border-radius:4px;
  transition:width .4s;}

/* 底部 tab */
#tabbar{flex:0 0 auto;display:flex;background:#fafafa;border-top:1px solid var(--line);}
#tabbar.hidden{display:none;}
.tab{flex:1;padding:8px 0 12px;text-align:center;cursor:pointer;border:none;background:none;
  font-family:inherit;font-size:11px;color:var(--text-2);}
.tab.active{color:var(--wx-green);}
.tab i{display:block;font-size:20px;font-style:normal;margin-bottom:2px;}

/* toast */
.toast{position:fixed;left:50%;top:50%;transform:translate(-50%,-50%) scale(.9);
  background:rgba(0,0,0,.8);color:#fff;padding:12px 20px;border-radius:10px;font-size:14px;
  opacity:0;pointer-events:none;transition:all .22s;z-index:99;max-width:80%;text-align:center;}
.toast.show{opacity:1;transform:translate(-50%,-50%) scale(1);}

.empty{text-align:center;padding:40px 20px;color:var(--text-2);font-size:14px;}
.empty .big{font-size:40px;display:block;margin-bottom:10px;opacity:.5;}