/* 新能源·AI学伴 —— 移动优先 / 浅色 */
:root{
  --green:#0b8f6c; --green-d:#087a5c; --green-l:#e5f5ef;
  --blue:#2b6de8; --blue-l:#eaf0fe;
  --amber:#c97a06; --amber-l:#fdf3e0; --amber-d:#9c6100;
  --red:#d64545; --red-l:#fdeaea; --red-d:#b52e2e;
  --ink:#1c2733; --ink-2:#5b6b7b; --ink-3:#8fa0af;
  --line:#e6ecf1; --bg:#f4f7f9; --card:#ffffff;
  --r:14px; --shadow:0 1px 3px rgba(16,42,67,.06),0 4px 14px rgba(16,42,67,.05);
  --tabbar-h:56px; --topbar-h:52px;
}
*{box-sizing:border-box; -webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--ink);
  font:15px/1.6 -apple-system,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,sans-serif}
.hidden{display:none!important}
a{color:var(--blue);text-decoration:none}
img{max-width:100%}

/* ---------- 未登录门 ---------- */
.gate{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(160deg,#e5f5ef 0%,#f4f7f9 60%);padding:20px;z-index:50}
.gate-card{background:#fff;border-radius:20px;padding:32px 24px;max-width:400px;width:100%;
  text-align:center;box-shadow:var(--shadow)}
.gate-logo{font-size:52px;line-height:1}
.gate-card h1{margin:14px 0 6px;font-size:24px;color:var(--ink)}
.gate-sub{color:var(--ink-2);margin:0 0 22px;font-size:13px}
.gate-tip{color:var(--ink-3);font-size:12px;margin:14px 0 0}
.link{color:var(--blue);font-size:13px;display:inline-block;margin-top:8px}

/* ---------- 布局 ---------- */
.app{max-width:760px;margin:0 auto;min-height:100vh}
.topbar{position:sticky;top:0;z-index:20;height:var(--topbar-h);
  display:flex;align-items:center;justify-content:space-between;gap:8px;
  padding:0 14px;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line)}
.brand{font-weight:700;font-size:16px;color:var(--green-d);white-space:nowrap}
.topbar-r{display:flex;align-items:center;gap:8px;min-width:0}
.user-badge{font-size:12px;color:var(--ink-2);background:var(--bg);border:1px solid var(--line);
  padding:3px 10px;border-radius:999px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:150px}
.btn-ghost{background:none;border:1px solid var(--line);color:var(--ink-2);border-radius:999px;
  font-size:12px;padding:4px 10px;cursor:pointer}
.view{min-height:calc(100vh - var(--topbar-h) - var(--tabbar-h));padding:14px 14px 40px}
.tabbar{position:sticky;top:var(--site-h,0);z-index:20;height:var(--tabbar-h);background:#fff;border-bottom:1px solid var(--line);
  display:flex;max-width:1100px;margin:0 auto;padding:0 12px}
.tabbar button{flex:1;min-width:0;background:none;border:0;cursor:pointer;font-size:13px;color:var(--ink-3);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;padding:5px 2px 4px;
  border-bottom:2px solid transparent;border-radius:0}
.tabbar button .ic{font-size:18px;line-height:1.1}
.tabbar button.on{color:var(--green);font-weight:600;border-bottom-color:var(--green)}
@media (max-width:560px){
  .tabbar button{font-size:11px;padding:5px 0 4px}
  .tabbar button .ic{font-size:17px}
}

/* ---------- 通用组件 ---------- */
.card{background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);
  padding:14px;margin-bottom:12px}
.card h3{margin:0 0 8px;font-size:15px}
.card h3 .sub{font-weight:400;color:var(--ink-3);font-size:12px;margin-left:6px}
.muted{color:var(--ink-3);font-size:12px}
.small{font-size:12px}
.row{display:flex;align-items:center;gap:8px}
.row-between{display:flex;align-items:center;justify-content:space-between;gap:8px}
.grow{flex:1;min-width:0}
.wrap{flex-wrap:wrap}
.mt8{margin-top:8px}.mt12{margin-top:12px}.mt16{margin-top:16px}.mb8{margin-bottom:8px}
.sec-title{display:flex;align-items:center;gap:8px;font-weight:700;font-size:15px;
  margin:18px 0 10px;color:var(--ink)}
.sec-title::before{content:"";width:4px;height:14px;background:var(--green);border-radius:2px}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;
  border:0;border-radius:10px;font-size:15px;padding:10px 18px;cursor:pointer;
  background:var(--bg);color:var(--ink);transition:opacity .15s}
.btn:active{opacity:.7}
.btn-primary{background:var(--green);color:#fff}
.btn-outline{background:#fff;border:1.5px solid var(--green);color:var(--green)}
.btn-danger{background:var(--red);color:#fff}
.btn-warn{background:var(--amber);color:#fff}
.btn-block{width:100%}
.btn-sm{padding:5px 12px;font-size:13px;border-radius:8px}
.btn[disabled]{opacity:.5;pointer-events:none}

/* 表单 */
.field{margin-bottom:12px}
.field label{display:block;font-size:13px;color:var(--ink-2);margin-bottom:5px;font-weight:600}
.input,select.input,textarea.input{width:100%;border:1.5px solid var(--line);border-radius:10px;
  padding:10px 12px;font-size:15px;background:#fff;color:var(--ink);
  font-family:inherit;outline:none}
.input:focus{border-color:var(--green)}
textarea.input{resize:vertical;min-height:84px}
.opt{display:flex;gap:8px;flex-wrap:wrap}
.opt label{border:1.5px solid var(--line);border-radius:999px;padding:7px 14px;font-size:14px;
  cursor:pointer;font-weight:400;color:var(--ink-2);user-select:none;margin:0}
.opt label.on{border-color:var(--green);background:var(--green-l);color:var(--green-d);font-weight:600}

/* 徽章/状态 */
.badge{display:inline-block;font-size:11px;padding:2px 9px;border-radius:999px;white-space:nowrap}
.badge.gray{background:var(--bg);color:var(--ink-2);border:1px solid var(--line)}
.badge.green{background:var(--green-l);color:var(--green-d)}
.badge.amber{background:var(--amber-l);color:var(--amber)}
.badge.red{background:var(--red-l);color:var(--red)}
.badge.blue{background:var(--blue-l);color:var(--blue)}

/* 附件网格 */
.att-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(96px,1fr));gap:8px;margin-top:8px}
.att-cell{position:relative;border-radius:10px;overflow:hidden;background:#000;
  aspect-ratio:4/3;display:flex;align-items:center;justify-content:center;cursor:pointer}
.att-cell img{width:100%;height:100%;object-fit:cover}
.att-cell .pdf{color:#fff;font-size:11px;display:flex;flex-direction:column;align-items:center;gap:2px}
.att-cell .del{position:absolute;top:4px;right:4px;background:rgba(0,0,0,.55);color:#fff;
  border:0;border-radius:50%;width:20px;height:20px;font-size:12px;line-height:1;cursor:pointer}

/* AI 结果 */
.score-ring{display:flex;align-items:center;gap:14px}
.score-num{font-size:40px;font-weight:800;line-height:1}
.dim-row{display:flex;align-items:center;gap:8px;margin-top:9px}
.dim-name{width:64px;font-size:13px;color:var(--ink-2);flex:none}
.dim-bar{flex:1;height:8px;background:var(--bg);border-radius:999px;overflow:hidden}
.dim-bar i{display:block;height:100%;border-radius:999px}
.dim-val{width:34px;text-align:right;font-size:13px;font-weight:700}

/* 回复 */
.reply{padding:10px 12px;border-radius:12px;margin-top:8px;font-size:14px}
.reply.teacher{background:var(--green-l);margin-left:14px}
.reply.student{background:var(--bg);border:1px solid var(--line);margin-right:14px}
.reply .who{font-size:12px;color:var(--ink-3);margin-bottom:2px}
.reply .who b{color:var(--ink-2)}

/* 帖子正文 */
.post-body{white-space:pre-wrap;word-break:break-word;font-size:14.5px;color:#23303c}

/* 列表行 */
.li{display:flex;gap:10px;align-items:flex-start;padding:11px 0;border-bottom:1px solid var(--line);cursor:pointer}
.li:last-child{border-bottom:0}
.li .thumb{width:54px;height:40px;border-radius:8px;object-fit:cover;background:var(--bg);flex:none}
.li .title{font-weight:600;font-size:14.5px;line-height:1.35;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.li .meta{font-size:12px;color:var(--ink-3);margin-top:3px;display:flex;gap:8px;flex-wrap:wrap;align-items:center}

/* 画像条 */
.pbar-row{display:flex;align-items:center;gap:8px;margin-top:8px}
.pbar-name{width:56px;font-size:13px;font-weight:600;color:var(--ink-2);flex:none;text-align:right}
.pbar-track{flex:1;height:10px;background:var(--bg);border-radius:999px;overflow:hidden}
.pbar-track i{display:block;height:100%;border-radius:999px}

/* 顶栏加载/空态 */
.loading,.empty{color:var(--ink-3);text-align:center;padding:34px 10px;font-size:13px}
.spin{display:inline-block;width:14px;height:14px;border:2px solid var(--green-l);
  border-top-color:var(--green);border-radius:50%;animation:sp .8s linear infinite;vertical-align:-2px;margin-right:6px}
@keyframes sp{to{transform:rotate(360deg)}}

/* modal */
.modal-mask{position:fixed;inset:0;background:rgba(10,20,30,.45);z-index:60;
  display:flex;align-items:flex-end;justify-content:center}
.modal{background:#fff;width:100%;max-width:760px;border-radius:18px 18px 0 0;
  max-height:88vh;overflow:auto;padding:0 16px calc(24px + env(safe-area-inset-bottom))}
.modal-head{display:flex;justify-content:space-between;align-items:center;
  position:sticky;top:0;background:#fff;z-index:5;padding:16px 0 10px}
.modal-head h3{margin:0;font-size:17px}
.modal-close{border:0;background:var(--bg);width:30px;height:30px;border-radius:50%;font-size:16px;cursor:pointer}
/* 桌面/投屏：弹窗居中并加宽（wide=汇总/提交情况等大内容弹窗） */
@media (min-width:900px){
  .modal{max-width:880px;border-radius:18px;align-self:center}
  .modal.wide{max-width:1200px;width:92vw;padding:0 26px 24px}
  .modal.wide .modal-head{padding:20px 0 12px}
  .modal.wide .post-body{font-size:15.5px}
  .modal.wide .dim-name{max-width:220px !important}
}
.lightbox{position:fixed;inset:0;background:#0a0a0a;z-index:70;display:flex;
  flex-direction:column;align-items:center;justify-content:center;padding:12px}
.lightbox img{max-width:100%;max-height:86vh;object-fit:contain}
.lightbox .x{position:absolute;top:14px;right:14px;color:#fff;background:rgba(255,255,255,.18);
  border:0;border-radius:50%;width:36px;height:36px;font-size:18px;cursor:pointer}

/* toast */
#toastRoot{position:fixed;top:calc(var(--topbar-h) + 12px);left:0;right:0;z-index:90;
  display:flex;flex-direction:column;align-items:center;gap:8px;pointer-events:none}
.toast{background:rgba(20,30,40,.92);color:#fff;padding:9px 18px;border-radius:999px;
  font-size:14px;animation:fadein .2s}
@keyframes fadein{from{opacity:0;transform:translateY(-6px)}to{opacity:1}}

/* 考勤表 */
table.tbl{width:100%;border-collapse:collapse;font-size:13.5px}
.tbl th,.tbl td{border-bottom:1px solid var(--line);padding:8px 6px;text-align:left}
.tbl th{color:var(--ink-3);font-weight:600;font-size:12px}
.present-dot{display:inline-block;width:8px;height:8px;border-radius:50%;margin-right:6px}
.dot-green{background:var(--green)}.dot-red{background:var(--red)}.dot-gray{background:var(--ink-3)}

/* 大屏内容区限宽居中 */
@media (min-width:761px){
  .view{max-width:1100px;margin:0 auto;width:100%}
}

/* ---------- 主站风格站头（与 www.qicheteach.cn 一致） ---------- */
.site-topbar{background:#3ea39d;color:#fff;font-size:12px}
.site-topbar .site-wrap{display:flex;align-items:center;gap:16px;padding:5px 16px;max-width:1200px;margin:0 auto}
.site-topbar .tb-right{margin-left:auto;opacity:.92}
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30;
  box-shadow:0 1px 4px rgba(16,42,67,.06)}
.site-wrap{max-width:1200px;margin:0 auto}
.site-header-in{display:flex;align-items:center;gap:18px;padding:8px 16px;min-height:62px}
.site-brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:700;font-size:17px;flex:0 0 auto}
.site-brand img{width:44px;height:44px;border-radius:8px;object-fit:cover}
.site-nav{display:flex;align-items:center;gap:1px;flex:1;justify-content:center;flex-wrap:wrap}
.site-nav-item{position:relative}
.site-nav-item>a{display:block;padding:6px 8px;color:var(--ink);font-size:13px;font-weight:600;border-radius:8px;cursor:pointer;white-space:nowrap}
.site-nav-item:hover>a{background:var(--green-l);color:var(--green-d)}
.site-sub{display:none;position:absolute;top:100%;left:0;background:#fff;border:1px solid var(--line);
  border-radius:10px;box-shadow:var(--shadow);min-width:230px;padding:6px;z-index:40}
.site-nav-item:hover .site-sub{display:block}
.site-sub a{display:block;padding:7px 10px;color:var(--ink-2);font-size:12.5px;border-radius:8px;white-space:nowrap}
.site-sub a:hover{background:var(--green-l);color:var(--green-d)}
.site-sub a.on{color:var(--green-d);font-weight:700;background:var(--green-l)}
.site-auth{display:flex;align-items:center;gap:8px;flex:0 0 auto;min-width:0}
.site-user{display:flex;flex-direction:column;align-items:flex-end;line-height:1.25;max-width:170px;overflow:hidden}
.site-user .u-name{font-size:13px;font-weight:700;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.site-user .u-role{font-size:11px;color:var(--ink-3);white-space:nowrap}
.site-btn{display:inline-block;padding:7px 16px;border-radius:8px;font-size:13.5px;font-weight:600;color:#fff!important;cursor:pointer;white-space:nowrap}
.site-btn.login{background:#d9534f}
.site-btn.reg{background:#f0a12e}
.site-btn.center{background:var(--green)}
.site-btn.center:hover{background:var(--green-d)}
.site-btn.ghost{background:transparent;color:var(--ink-3)!important;border:1px solid var(--line);padding:6px 10px}
@media (max-width:860px){
  .site-nav{display:none}
  .site-brand span{font-size:15px;max-width:150px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .site-topbar .tb-right{display:none}
}
.gate{position:relative;min-height:calc(100vh - 210px)}

/* 题库知识技能树 */
.qTreeNode{display:flex;align-items:center;gap:6px;padding:7px 8px;border-radius:8px;cursor:pointer;font-size:13px;line-height:1.3}
.qTreeNode:hover{background:var(--green-l,#eef7f1)}
.qTreeNode.on{background:var(--green-l,#d9f2e0);font-weight:600}
.qTreeNode .qNodeOps{display:none;gap:2px;flex:none}
.qTreeNode:hover .qNodeOps{display:flex}
.qTreeNode .qNodeOps button{border:none;background:transparent;cursor:pointer;font-size:12px;padding:2px 3px;line-height:1}