/* 学生端样式 · 由 index.html 内联样式拆出 */
:root{
  --bg:#f5f8fc; --card:#ffffff; --ink:#0b1220; --txt:#0f172a; --muted:#64748b;
  --line:#e2e8f0; --teal:#0e93a8; --blue:#2563eb; --cyan:#06b6d4; --amber:#f59e0b;
  --ok:#2f9e44; --ok2:#10b981; --bad:#ef4444; --gold:#e0a919;
  --sh:0 8px 24px rgba(15,23,42,.08); --shh:0 14px 34px rgba(15,23,42,.14);
  --mono:"JetBrains Mono","Cascadia Code",Consolas,monospace; --ink2:#334155;
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%}
body{
  font-family:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--txt); background:var(--bg);
  background-image:radial-gradient(1100px 560px at 10% -12%, rgba(37,99,235,.13), transparent 60%),
                   radial-gradient(900px 520px at 96% -6%, rgba(6,182,212,.14), transparent 60%);
  min-height:100vh;
}
button{font-family:inherit;cursor:pointer;border:none}
.screen{display:none;min-height:100vh}
.screen.active{display:block}

/* ===== 登录页 ===== */
#screen-login{display:none;align-items:center;justify-content:center}
#screen-login.active{display:flex}
.login-box{
  background:var(--card); border-radius:18px; box-shadow:var(--shh);
  padding:44px 46px 40px; width:min(430px,92vw); text-align:center; position:relative; overflow:hidden;
}
.login-box::before{content:"";position:absolute;inset:0 0 auto 0;height:6px;
  background:linear-gradient(90deg,var(--teal),var(--cyan),var(--blue))}
.login-icon{font-size:44px;margin-bottom:6px}
.login-box h1{font-size:24px;color:var(--ink);margin-bottom:6px}
.login-box .sub{color:var(--muted);font-size:13px;margin-bottom:26px}
.login-box label{display:block;text-align:left;font-size:13px;color:var(--muted);margin:14px 0 6px}
.login-box input{
  width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;
  font-size:15px;font-family:inherit;outline:none;transition:.2s;background:#fbfdff}
.login-box input:focus{border-color:var(--teal);box-shadow:0 0 0 3px rgba(14,147,168,.14)}
.btn-primary{
  margin-top:26px;width:100%;padding:13px;border-radius:10px;font-size:16px;font-weight:600;
  color:#fff;background:linear-gradient(135deg,#0e93a8,#2563eb);box-shadow:0 6px 16px rgba(14,147,168,.32);
  transition:.2s}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 10px 22px rgba(14,147,168,.4)}
.login-err{color:var(--bad);font-size:13px;margin-top:12px;min-height:18px}
.login-tip{margin-top:18px;font-size:12px;color:var(--muted)}

/* ===== 顶部栏（主菜单） ===== */
.topbar{
  position:sticky;top:0;z-index:50;backdrop-filter:blur(10px);
  background:rgba(255,255,255,.82);border-bottom:1px solid var(--line);
  padding:14px 26px;display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.topbar .logo{font-size:20px;font-weight:700;color:var(--ink);display:flex;align-items:center;gap:9px}
.topbar .logo .badge{font-size:11px;font-weight:600;color:#fff;background:var(--teal);
  border-radius:999px;padding:3px 10px;letter-spacing:1px}
.topbar .spacer{flex:1}
.user-chip{display:flex;align-items:center;gap:8px;background:#f0f7fb;border:1px solid #d8ecf2;
  border-radius:999px;padding:6px 14px;font-size:14px;color:var(--ink)}
.user-chip b{color:var(--teal)}
.star-chip{display:flex;align-items:center;gap:6px;background:#fff7e8;border:1px solid #f6e3b3;
  border-radius:999px;padding:6px 14px;font-size:14px;font-weight:700;color:#b45309}
.btn-ghost{background:#fff;border:1.5px solid var(--line);border-radius:999px;padding:7px 16px;
  font-size:13px;color:var(--muted);transition:.2s}
.btn-ghost:hover{border-color:var(--bad);color:var(--bad)}

/* ===== 主菜单 ===== */
.menu-wrap{max-width:1080px;margin:0 auto;padding:36px 22px 60px}
.menu-hello{margin-bottom:22px}
.menu-hello h2{font-size:22px;color:var(--ink)}
.menu-hello p{color:var(--muted);font-size:14px;margin-top:5px}
.menu-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(310px,1fr));gap:18px}
.mod-card{
  background:var(--card);border-radius:16px;box-shadow:var(--sh);padding:22px;position:relative;
  border:1px solid rgba(226,232,240,.8);transition:.22s;cursor:pointer;overflow:hidden}
.mod-card:hover{transform:translateY(-4px);box-shadow:var(--shh)}
.mod-card .num{position:absolute;top:14px;right:16px;font-size:12px;font-weight:700;color:#cbd5e1}
.mod-icon{width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;
  font-size:26px;margin-bottom:14px}
.mod-card h3{font-size:17px;color:var(--ink);margin-bottom:7px}
.mod-card p{font-size:13px;color:var(--muted);line-height:1.65;min-height:42px}
.mod-foot{display:flex;align-items:center;justify-content:space-between;margin-top:14px}
.mod-state{font-size:12px;font-weight:600;border-radius:999px;padding:4px 12px}
.st-todo{background:#f1f5f9;color:var(--muted)}
.st-done{background:#e6f7ee;color:var(--ok)}
.mod-go{font-size:13px;font-weight:600;color:var(--teal);background:#e8f6f8;border-radius:999px;padding:5px 14px}
.c-teal{background:#e6f6f8}.c-blue{background:#e8effd}.c-amber{background:#fdf3e0}
.c-green{background:#e8f7ee}.c-purple{background:#f0eafd}.c-rose{background:#fdecef}

/* ===== 模块页通用 ===== */
.modbar{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);padding:12px 22px;display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.btn-back{
  display:inline-flex;align-items:center;gap:6px;background:var(--teal);color:#fff;
  border-radius:999px;padding:8px 16px;font-size:13px;font-weight:600;box-shadow:0 4px 12px rgba(14,147,168,.3);
  transition:.2s}
.btn-back:hover{background:#0b7c8e}
.modbar h2{font-size:17px;color:var(--ink)}
.modbar .spacer{flex:1}
.mod-wrap{max-width:1060px;margin:0 auto;padding:26px 20px 70px}
.panel{background:var(--card);border-radius:16px;box-shadow:var(--sh);padding:26px;margin-bottom:20px;
  border:1px solid rgba(226,232,240,.7)}
.panel h3{font-size:17px;color:var(--ink);margin-bottom:14px;display:flex;align-items:center;gap:8px}
.hint{font-size:13.5px;color:var(--muted);line-height:1.8}

/* ===== 翻书 ===== */
.book-stage{display:flex;flex-direction:column;align-items:center}
.book{
  position:relative;width:min(760px,94vw);aspect-ratio:4/3;perspective:1600px;
  background:#fff;border-radius:12px;box-shadow:var(--shh);overflow:hidden}
.book .pg{position:absolute;inset:0;backface-visibility:hidden}
.book img{width:100%;height:100%;object-fit:contain;background:#fff;display:block}
.book .pg-turn{transform-origin:left center;z-index:5;transition:transform .55s cubic-bezier(.4,.1,.3,1)}
.book .shade{position:absolute;inset:0;background:linear-gradient(90deg,rgba(15,23,42,0),rgba(15,23,42,.16));pointer-events:none}
.book-nav{display:flex;align-items:center;gap:18px;margin-top:20px}
.btn-page{background:#fff;border:1.5px solid var(--line);border-radius:999px;padding:9px 20px;font-size:14px;
  color:var(--ink);font-weight:600;transition:.2s}
.btn-page:hover:not(:disabled){border-color:var(--teal);color:var(--teal)}
.btn-page:disabled{opacity:.4;cursor:not-allowed}
.page-ind{font-size:14px;color:var(--muted);min-width:150px;text-align:center}
.page-dots{display:flex;gap:8px;margin-top:14px}
.pdot{width:26px;height:6px;border-radius:3px;background:#dbe4ee;transition:.2s}
.pdot.cur{background:var(--teal)}
.pdot.seen{background:#9fd8e0}

/* ===== 自学板块 · 学习视频 ===== */
.video-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:20px;margin-top:20px}
.video-card{background:#fff;border:1.5px solid var(--line);border-radius:14px;overflow:hidden;
  box-shadow:var(--sh);transition:.2s}
.video-card:hover{box-shadow:var(--shh);transform:translateY(-2px)}
.video-card video{width:100%;aspect-ratio:16/9;background:#0b1220;display:block}
.video-card .vc-info{padding:13px 16px 15px;display:flex;align-items:center;gap:10px}
.video-card .vc-ico{width:34px;height:34px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:17px;flex:none}
.video-card .vc-tt{font-size:14.5px;font-weight:700;color:var(--ink);line-height:1.4}
.video-card .vc-sub{font-size:12px;color:var(--muted);margin-top:2px}

/* ===== VR 超市（课件第4页原版布局） ===== */
.vr-page{display:flex;flex-direction:column;height:calc(100vh - 62px);padding:16px 20px 20px;gap:12px}
.vr-title-row{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.vr-stitle{font-size:22px;font-weight:800;color:var(--ink);letter-spacing:.5px;
  display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.vrhint{font-size:13.5px;font-weight:600;color:var(--muted);letter-spacing:0;white-space:nowrap}
.vr-count{margin-left:auto;font-size:13px;font-weight:700;color:#b45309;background:#fdf3e0;
  border:1px solid #f6e3b3;border-radius:999px;padding:5px 14px;white-space:nowrap}
.vrframe{flex:1;min-height:0;border-radius:16px;overflow:hidden;border:1px solid rgba(6,182,212,.5);
  box-shadow:var(--shh);background:#0b1220}
.vrframe iframe{width:100%;height:100%;border:0;display:block}
@keyframes pop{from{transform:scale(.92);opacity:0}to{transform:scale(1);opacity:1}}

/* ===== 二维码实验 ===== */
.qr-intro{background:linear-gradient(135deg,#eef7fb,#f2f7ff);border:1px solid #d9ecf3;border-radius:14px;
  padding:16px 20px;font-size:14px;color:var(--ink);line-height:1.8;margin-bottom:20px}
.qr-cards{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media (max-width:820px){.qr-cards{grid-template-columns:1fr}}
.qr-card{background:var(--card);border-radius:16px;box-shadow:var(--sh);padding:24px;border-top:4px solid var(--teal);position:relative}
.qr-card.alt{border-top-color:var(--amber)}
.qr-card .qno{font-size:12px;font-weight:700;color:var(--teal);letter-spacing:2px}
.qr-card.alt .qno{color:var(--amber)}
.qr-card h4{font-size:17px;color:var(--ink);margin:6px 0 14px}
.qr-mock{border:1.5px solid var(--line);border-radius:10px;background:#fbfdff;padding:13px;font-size:13px;
  color:var(--muted);margin-bottom:14px;position:relative}
.qr-mock .chip{position:absolute;top:-10px;right:12px;background:#fff;border:1px solid var(--line);
  border-radius:999px;font-size:10.5px;padding:2px 10px;color:var(--teal)}
.qr-arrow{text-align:center;font-size:20px;color:var(--teal);margin:4px 0 10px}
.qr-card p{font-size:13.5px;color:var(--txt);line-height:1.85}
.qr-card p b{color:var(--teal)}
.qr-flow{display:flex;align-items:center;gap:6px;flex-wrap:wrap;margin:14px 0;font-size:12.5px;color:var(--muted)}
.qr-flow .fs{background:#eef4fa;border-radius:6px;padding:4px 10px;color:var(--ink)}
.qr-flow .fa{color:var(--teal)}
.qr-link{display:inline-flex;align-items:center;gap:7px;background:linear-gradient(135deg,#0e93a8,#2563eb);
  color:#fff;font-size:13.5px;font-weight:600;border-radius:999px;padding:9px 18px;text-decoration:none;
  box-shadow:0 5px 14px rgba(14,147,168,.3);transition:.2s}
.qr-link:hover{transform:translateY(-1px)}
.qr-steps{display:flex;align-items:center;justify-content:center;gap:0;flex-wrap:wrap;
  background:var(--card);border-radius:14px;box-shadow:var(--sh);padding:18px 20px;margin:20px 0}
.qr-step{display:flex;flex-direction:column;align-items:center;gap:7px;min-width:130px}
.qr-step .qn{width:34px;height:34px;border-radius:50%;background:#e6f6f8;color:var(--teal);
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px}
.qr-step .qt{font-size:12.5px;color:var(--ink);text-align:center}
.qr-sep{color:#b9c6d6;font-size:22px;padding:0 10px;margin-bottom:18px}
.qr-done-row{text-align:center;margin-top:6px}

/* ===== ETC（课件第10页原版样式 · 作用域限定） ===== */
:root{--b1:#2563eb;--b2:#06b6d4}
.etc-page{display:flex;flex-direction:column;height:calc(100vh - 62px);padding:18px 22px 22px;gap:4px}
#mod-etc .stitle{font-size:23px;font-weight:800;color:var(--ink);display:flex;align-items:center;gap:11px;margin-bottom:5px;letter-spacing:.5px}
#mod-etc .stitle::before{content:"";width:5px;height:24px;border-radius:3px;background:linear-gradient(180deg,var(--b2),var(--b1));box-shadow:0 0 12px rgba(6,182,212,.7)}
#mod-etc .sdesc{font-size:16px;color:var(--muted);margin-bottom:10px}
#mod-etc .stage{flex:1;position:relative;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--sh);overflow:hidden;min-height:0}
#mod-etc .stage svg{width:100%;height:100%;display:block}
#mod-etc .dragable{cursor:grab}
#mod-etc .dragable:active{cursor:grabbing}
#mod-etc .hint{position:absolute;left:50%;transform:translateX(-50%);bottom:10px;background:rgba(11,18,32,.86);
  border:1px solid rgba(6,182,212,.6);color:#7dd3fc;padding:7px 18px;border-radius:9px;font-size:15.5px;
  font-weight:700;pointer-events:none;transition:.3s;white-space:nowrap;line-height:1.5}
#mod-etc .statusline{position:absolute;top:10px;left:50%;transform:translateX(-50%);background:#fff;border:1.5px solid var(--b2);
  color:var(--b1);border-radius:10px;padding:6px 18px;font-size:15.5px;font-weight:700;box-shadow:var(--sh);white-space:nowrap}
#mod-etc .btn{padding:8px 18px;border:none;border-radius:9px;font-size:16px;font-weight:700;cursor:pointer;color:#fff}
#mod-etc .btn.ghost{background:#fff;color:var(--b1);border:1.5px solid #bfdbfe;box-shadow:none}
#mod-etc .btn.ghost:hover{border-color:var(--b2);color:var(--b2)}

/* ===== AI 学伴「小识」（课件原版 · 状态机驱动） ===== */
#buddy{position:fixed;right:18px;bottom:60px;z-index:95;display:flex;flex-direction:column;align-items:flex-end;gap:10px;}
#buddy.off{display:none;}
#buddy.noava .bub,#buddy.noava .bstat{display:none;}
.bub{position:relative;width:128px;height:128px;border:none;padding:0;background:transparent;cursor:pointer;
  filter:drop-shadow(0 10px 22px rgba(37,99,235,.3));transition:transform .18s;}
.bub:hover{transform:translateY(-2px);}
.bub:active{transform:scale(.94);}
.bub img{width:100%;height:100%;display:block;border-radius:50%;object-fit:cover;
  border:3px solid rgba(37,99,235,.4);background:#e0f2fe;}
.bub::after{content:'';position:absolute;inset:-7px;border-radius:50%;border:3px solid #06b6d4;
  opacity:0;pointer-events:none;}
#buddy[data-state="listening"] .bub::after{opacity:.9;animation:bring2 1.5s ease-out infinite;border-color:#22c55e;}
#buddy[data-state="thinking"] .bub::after{opacity:.85;animation:bring2 1.1s ease-out infinite;border-color:#f59e0b;}
#buddy[data-state="speaking"] .bub::after{opacity:.75;animation:bring2 1.5s ease-out infinite;border-color:#2563eb;}
@keyframes bring2{0%{transform:scale(.92);opacity:.85}100%{transform:scale(1.3);opacity:0}}
#buddy[data-state="speaking"] .bub img{animation:bspeak2 .34s ease-in-out infinite alternate;}
@keyframes bspeak2{from{transform:scale(1)}to{transform:scale(1.035)}}
#buddy[data-state="idle"] .bub{animation:bfloat 3.2s ease-in-out infinite;}
@keyframes bfloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-4px)}}
.bpanel{width:352px;height:428px;background:rgba(255,255,255,.97);border:1px solid rgba(37,99,235,.18);
  border-radius:16px;box-shadow:0 20px 54px rgba(15,23,42,.28);display:flex;flex-direction:column;overflow:hidden;
  animation:bfadein .22s;}
@keyframes bfadein{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
#buddy:not(.open) .bpanel{display:none;}
.bpanel .bph{display:flex;align-items:center;gap:8px;padding:9px 12px;background:linear-gradient(135deg,#06b6d4,#2563eb);
  color:#fff;flex:0 0 auto;}
.bpanel .bph b{font-size:15.5px;letter-spacing:.5px;}
.bphava{width:30px;height:30px;border-radius:50%;object-fit:cover;border:1.5px solid rgba(255,255,255,.75);flex:0 0 auto;}
.bpanel .bst{font-size:12.5px;opacity:.92;background:rgba(255,255,255,.2);border-radius:20px;padding:2px 9px;
  margin-left:auto;}
.bpanel .btools{display:flex;gap:4px;}
.bpanel .btool{width:26px;height:26px;border:none;background:rgba(255,255,255,.18);color:#fff;border-radius:8px;
  font-size:13px;cursor:pointer;line-height:1;}
.bpanel .btool:hover{background:rgba(255,255,255,.32);}
.bpanel .btool.off{opacity:.45;}
.blog{flex:1;overflow-y:auto;padding:11px 12px;font-size:14.5px;line-height:1.75;background:#f8fbfe;}
.blog .bmsg{margin-bottom:9px;display:flex;}
.blog .bmsg.me{justify-content:flex-end;}
.blog .bmsg .bub2{max-width:80%;padding:7px 11px;border-radius:12px;word-break:break-word;white-space:pre-wrap;}
.blog .bmsg.you .bub2{background:#fff;border:1px solid var(--line);color:var(--ink2);border-bottom-left-radius:4px;}
.blog .bmsg.me .bub2{background:linear-gradient(135deg,#2563eb,#06b6d4);color:#fff;border-bottom-right-radius:4px;}
.blog .bmsg .bub2 .bcaret{display:inline-block;width:6px;height:14px;background:#2563eb;vertical-align:-2px;
  margin-left:2px;animation:bbink .7s steps(1) infinite;}
@keyframes bbink{50%{opacity:0}}
.bquick{display:flex;flex-wrap:wrap;gap:6px;padding:7px 12px 0;flex:0 0 auto;}
.bquick button{border:1px solid rgba(37,99,235,.3);background:#eff6ff;color:var(--b1);border-radius:14px;
  padding:4px 10px;font-size:12.5px;cursor:pointer;font-family:inherit;}
.bquick button:hover{background:#dbeafe;}
.binrow{display:flex;gap:6px;padding:9px 12px 11px;flex:0 0 auto;border-top:1px solid var(--line);}
.binrow input{flex:1;min-width:0;font-family:inherit;font-size:14px;padding:7px 10px;border:1px solid var(--line);
  border-radius:9px;outline:none;-webkit-user-select:text;user-select:text;}
.binrow input:focus{border-color:var(--b2);}
.binrow button{border:none;border-radius:9px;font-family:inherit;font-size:13.5px;font-weight:700;cursor:pointer;}
.bmic{width:38px;background:#f1f5f9;color:var(--ink2);font-size:16px!important;}
.bmic.on{background:var(--bad);color:#fff;}
.bmic.dead{opacity:.4;cursor:not-allowed;}
.bsend{padding:7px 14px;background:linear-gradient(135deg,#2563eb,#06b6d4);color:#fff;}
.bsend:disabled{opacity:.5;cursor:default;}
.bstat{position:absolute;right:142px;bottom:52px;background:rgba(11,18,32,.9);color:#7dd3fc;font-size:13px;
  border:1px solid rgba(6,182,212,.45);border-radius:12px;padding:2px 9px;white-space:nowrap;opacity:0;
  transition:opacity .2s;pointer-events:none;}
#buddy:not([data-state="idle"]) .bstat{opacity:1;}

/* ===== 实验清单 ===== */
.lab-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media (max-width:900px){.lab-grid{grid-template-columns:1fr}}
.guide-item{border:1.5px solid var(--line);border-radius:12px;overflow:hidden;margin-bottom:12px;background:#fbfdff}
.guide-item .gi-head{display:flex;align-items:center;gap:11px;padding:13px 16px;cursor:pointer;background:#fff}
.guide-item .gi-num{width:30px;height:30px;border-radius:9px;background:#e6f6f8;color:var(--teal);
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;flex:none}
.guide-item .gi-tt{flex:1;font-size:15px;font-weight:600;color:var(--ink)}
.guide-item .gi-arrow{color:var(--muted);transition:transform .25s;font-size:13px}
.guide-item.open .gi-arrow{transform:rotate(90deg)}
.guide-item .gi-body{max-height:0;overflow:hidden;transition:max-height .3s;font-size:13.5px;color:var(--txt);
  line-height:1.9;padding:0 16px}
.guide-item.open .gi-body{max-height:420px;padding:2px 16px 15px}
.guide-item .gi-body ul{padding-left:20px}
.guide-item .gi-body code{background:#eef4fa;border-radius:5px;padding:1px 7px;font-family:var(--mono);font-size:12.5px;color:#0b7c8e}

/* mPython 积木 */
.blocks{display:flex;gap:14px;flex-wrap:wrap}
.block-col{flex:1;min-width:250px}
.block-col h5{font-size:13px;color:var(--ink);margin-bottom:9px;display:flex;gap:7px;align-items:center}
.blk{border-radius:7px;padding:6px 11px;font-size:12.5px;margin-bottom:5px;color:#fff;line-height:1.5}
.blk-event{background:#c2410c}.blk-io{background:#0e7490}.blk-ctrl{background:#7c3aed}
.blk-ctrl2{background:#4d7c0f}.blk-out{background:#a16207}.blk-op{background:#be185d}
.blk .ind{display:inline-block;width:14px}

/* 实验记录单 */
.lab-form label{display:block;font-size:13px;color:var(--muted);margin:13px 0 5px;font-weight:600}
.lab-form input[type=text],.lab-form input[type=date],.lab-form select,.lab-form textarea{
  width:100%;padding:10px 13px;border:1.5px solid var(--line);border-radius:9px;font-size:14px;
  font-family:inherit;outline:none;background:#fbfdff;color:var(--txt);transition:.2s}
.lab-form input:focus,.lab-form select:focus,.lab-form textarea:focus{border-color:var(--teal);box-shadow:0 0 0 3px rgba(14,147,168,.13)}
.lab-form textarea{resize:vertical;min-height:66px}
.lab-form .ro{background:#f1f5f9;color:#64748b}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media (max-width:640px){.form-row{grid-template-columns:1fr}}
.radio-line{display:flex;gap:22px;align-items:center;padding:9px 0}
.radio-line label{display:flex;gap:7px;align-items:center;margin:0;font-size:14px;color:var(--txt);font-weight:400;cursor:pointer}
.chk-line{display:flex;gap:8px;align-items:center;font-size:14px;color:var(--txt);padding:8px 0;cursor:pointer}
.form-err{color:var(--bad);font-size:13px;min-height:18px;margin-top:8px}

/* ===== 当堂检测 ===== */
.quiz-part-tag{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;border-radius:999px;
  padding:5px 15px;margin-bottom:6px}
.qz-sec .panel{border-top:4px solid var(--teal)}
.qz-sec.fin .panel{border-top-color:var(--amber)}
.q-item{border:1.5px solid var(--line);border-radius:12px;padding:16px 18px;margin-bottom:14px;background:#fbfdff}
.q-item .q-t{font-size:14.5px;color:var(--ink);line-height:1.8;margin-bottom:11px;font-weight:600}
.q-item .q-t .qn{color:var(--teal);margin-right:4px}
.qz-sec.fin .q-item .q-t .qn{color:var(--amber)}
.q-opt{display:flex;gap:10px;align-items:flex-start;padding:8px 12px;border-radius:9px;cursor:pointer;
  font-size:14px;color:var(--txt);transition:.15s;border:1.5px solid transparent;margin-bottom:5px}
.q-opt:hover{background:#f0f7fb}
.q-opt input{margin-top:3px;accent-color:var(--teal)}
.q-opt.sel{background:#e9f7f9;border-color:#9fd8e0}
.qz-sec.fin .q-opt input{accent-color:var(--amber)}
.qz-sec.fin .q-opt.sel{background:#fdf6e7;border-color:#f0d9a0}
.q-opt.right{background:#e8f7ee;border-color:#9fe3b8}
.q-opt.wrong{background:#fdecec;border-color:#f5b5b5}
.qz-actions{display:flex;gap:13px;align-items:center;flex-wrap:wrap;margin-top:4px}
.qz-result{border-radius:12px;padding:14px 18px;margin-top:14px;font-size:14px;display:none;align-items:center;gap:10px;flex-wrap:wrap}
.qz-result.show{display:flex;animation:pop .3s}
.qz-result.good{background:#e8f7ee;color:var(--ok)}
.qz-result.mid{background:#fdf6e7;color:#b45309}
.qz-result.bad{background:#fdecec;color:var(--bad)}
.qz-stars{font-size:19px;letter-spacing:2px}
.star-summary{display:flex;align-items:center;gap:9px;background:linear-gradient(135deg,#fff8ea,#fdf3e0);
  border:1px solid #f6e3b3;border-radius:12px;padding:13px 18px;font-size:14px;color:#92600a;font-weight:600}
.star-summary .ss-num{font-size:22px;font-weight:800;color:#b45309}

/* ===== 课堂综合评价 ===== */
.final-eval{display:none;margin-top:16px;border-radius:14px;overflow:hidden;border:1px solid #dbeafe;
  background:#fff;box-shadow:var(--sh);animation:pop .35s}
.final-eval.show{display:block}
.fe-head{display:flex;align-items:center;gap:10px;padding:13px 18px;background:linear-gradient(135deg,#06b6d4,#2563eb);color:#fff}
.fe-head .fe-ico{font-size:26px}
.fe-head b{font-size:16px;letter-spacing:.5px}
.fe-grade{margin-left:auto;background:rgba(255,255,255,.22);border-radius:20px;padding:4px 14px;font-size:14px;font-weight:800;letter-spacing:1px}
.fe-stats{display:flex;gap:12px;padding:14px 18px 4px;flex-wrap:wrap}
.fe-stat{flex:1;min-width:130px;background:#f6f9fd;border:1px solid #e4ecf5;border-radius:10px;padding:10px 14px;text-align:center}
.fe-stat b{display:block;font-size:21px;color:var(--blue);font-weight:800}
.fe-stat span{font-size:12px;color:var(--muted)}
.fe-acts{display:flex;gap:8px;padding:12px 18px 0;flex-wrap:wrap}
.fe-act{display:flex;align-items:center;gap:6px;font-size:12.5px;border-radius:999px;padding:5px 12px;border:1px solid}
.fe-act.done{background:#e8f7ee;border-color:#bfe5cd;color:var(--ok)}
.fe-act.todo{background:#f4f6f8;border-color:#e2e8f0;color:#94a3b8}
.fe-bar{margin:12px 18px 0;height:9px;background:#eef2f7;border-radius:6px;overflow:hidden}
.fe-bar i{display:block;height:100%;border-radius:6px;background:linear-gradient(90deg,#06b6d4,#2563eb);transition:width .8s ease}
.fe-barlbl{font-size:12px;color:var(--muted);padding:6px 18px 0}
.fe-text{margin:12px 18px 16px;background:#f8fbfe;border-left:4px solid var(--b2,#06b6d4);border-radius:0 10px 10px 0;
  padding:12px 15px;font-size:14px;line-height:1.9;color:var(--txt)}
.fe-text b{color:var(--blue)}
@media (max-width:640px){.fe-head{flex-wrap:wrap}.fe-grade{margin-left:0}}

/* ===== Toast ===== */
#toast{position:fixed;left:50%;bottom:34px;transform:translateX(-50%) translateY(20px);z-index:999;
  background:var(--ink);color:#fff;font-size:14px;border-radius:999px;padding:11px 24px;opacity:0;
  pointer-events:none;transition:.3s;box-shadow:var(--shh);max-width:88vw;text-align:center}
#toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.done-banner{background:#e8f7ee;border:1.5px solid #b7e6c8;color:var(--ok);border-radius:12px;
  padding:13px 18px;font-size:14px;font-weight:600;display:flex;align-items:center;gap:9px;margin-bottom:16px}

/* ===== 登录：个人码 ===== */
.code-row{margin-top:12px;text-align:left}
.code-row label{display:block;font-size:13px;color:#64748b;margin-bottom:6px;font-weight:600}
.code-row input{width:100%;letter-spacing:6px;text-align:center;font-size:20px;font-weight:700;padding:12px}
.code-tip{font-size:12px;color:#94a3b8;margin-top:6px;line-height:1.6}

/* ===== 二维码实验：输入 → 生成 → 提交 → 收码 → 识别 ===== */
#qrText{width:100%;border:1.5px solid var(--line);border-radius:10px;padding:12px 14px;
  font-size:14px;font-family:inherit;color:var(--txt);resize:vertical;outline:none;line-height:1.6}
#qrText:focus{border-color:var(--blue)}
.qr-btnrow{margin-top:14px}
.qr-btnrow .btn-primary{width:auto;padding:11px 30px}
.qr-stage{margin-top:18px;text-align:center}
.qr-stage canvas{width:264px;max-width:82%;border:1px solid var(--line);border-radius:10px;background:#fff}
.qr-stage.qr-plain{margin-top:12px}
.qr-meta{font-size:13px;color:var(--muted);margin:10px 0 12px;word-break:break-all}
.qr-hint{font-size:12px;color:#94a3b8;margin-top:10px;line-height:1.6}
.inbox-result{margin-top:14px;padding:14px 16px;background:#f0fdf4;border:1px solid #bbf7d0;border-radius:10px;
  font-size:14px;line-height:1.7;word-break:break-all;text-align:left}
.inbox-result b{color:var(--ok)}