/* ============================================================
   桐晞云教育 · 百川课堂 · 设计系统
   方向：书院质感 —— 宣纸底色、松烟墨绿、朱砂点睛、金箔嘉奖
   ============================================================ */
:root{
  --paper:#F4EFE2;
  --surface:#FCFAF3;
  --surface2:#F0EADA;
  --ink:#1C2A24;
  --ink2:#3B4A42;
  --muted:#7E8B80;
  --line:#E3DAC4;
  --line2:#D3C8AC;
  --pine:#1E5B4B;
  --pine-d:#143E33;
  --pine-l:#E2EDE7;
  --cinn:#C2452D;
  --cinn-d:#A23722;
  --cinn-l:#F8E5DD;
  --gold:#B9892B;
  --gold-l:#F4EAD0;
  --blue:#33546D;
  --blue-l:#E3EAF1;
  --radius:14px;
  --radius-s:9px;
  --shadow:0 1px 2px rgba(28,42,36,.05),0 10px 28px -14px rgba(28,42,36,.22);
  --shadow-lg:0 24px 60px -20px rgba(28,42,36,.35);
  --fd:"Noto Serif SC","Songti SC","STSong",serif;
  --fb:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{font-size:15px}
body{
  font-family:var(--fb);
  background:var(--paper);
  color:var(--ink);
  -webkit-font-smoothing:antialiased;
  line-height:1.55;
}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,select,textarea{font-family:inherit;font-size:1rem;color:var(--ink)}
a{color:var(--pine);text-decoration:none}
::selection{background:var(--pine);color:#fff}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:#CBBF9F;border-radius:8px;border:2px solid var(--paper)}
::-webkit-scrollbar-track{background:transparent}

.ic{display:inline-flex;vertical-align:-3px}
.num{font-variant-numeric:tabular-nums}

/* ---------- 通用组件 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:7px;
  padding:9px 18px;border-radius:10px;font-size:.93rem;font-weight:500;
  border:1px solid transparent;transition:all .18s ease;white-space:nowrap;
}
.btn:active{transform:translateY(1px)}
.btn-pine{background:var(--pine);color:#FDFBF5}
.btn-pine:hover{background:var(--pine-d)}
.btn-cinn{background:var(--cinn);color:#FDFBF5}
.btn-cinn:hover{background:var(--cinn-d)}
.btn-ghost{border-color:var(--line2);color:var(--ink2);background:var(--surface)}
.btn-ghost:hover{border-color:var(--pine);color:var(--pine)}
.btn-gold{background:var(--gold);color:#fff}
.btn-gold:hover{filter:brightness(.93)}
.btn-sm{padding:5px 12px;font-size:.85rem;border-radius:8px}
.btn[disabled]{opacity:.45;pointer-events:none}

.chip{
  display:inline-flex;align-items:center;gap:5px;
  padding:4px 12px;border-radius:999px;font-size:.82rem;font-weight:500;
  background:var(--surface2);color:var(--ink2);border:1px solid var(--line);
}
.chip-pine{background:var(--pine-l);color:var(--pine);border-color:transparent}
.chip-cinn{background:var(--cinn-l);color:var(--cinn);border-color:transparent}
.chip-gold{background:var(--gold-l);color:var(--gold);border-color:transparent}
.chip-blue{background:var(--blue-l);color:var(--blue);border-color:transparent}
.chip.clickable{cursor:pointer;transition:all .15s}
.chip.clickable:hover{border-color:var(--pine);color:var(--pine)}
.chip.clickable.on{background:var(--pine);color:#fff;border-color:var(--pine)}

.card{
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow);
}
.card-pad{padding:22px}

.sec-head{display:flex;align-items:baseline;justify-content:space-between;margin:0 0 14px}
.sec-title{font-family:var(--fd);font-size:1.15rem;font-weight:700;display:flex;align-items:baseline;gap:10px}
.sec-title .idx{font-size:.78rem;color:var(--cinn);letter-spacing:.12em;font-weight:600}
.sec-link{font-size:.85rem;color:var(--muted);cursor:pointer;display:inline-flex;align-items:center;gap:3px}
.sec-link:hover{color:var(--pine)}

.hr-double{border:none;border-top:3px double var(--line2);margin:18px 0}

.pbar{height:7px;background:var(--surface2);border-radius:99px;overflow:hidden}
.pbar>i{display:block;height:100%;background:var(--pine);border-radius:99px;transition:width .6s cubic-bezier(.2,.8,.2,1)}
.pbar.cinn>i{background:var(--cinn)}
.pbar.gold>i{background:var(--gold)}

.stars{color:var(--gold);letter-spacing:1px;font-size:.85rem}

.tag-type{display:inline-flex;align-items:center;gap:4px;font-size:.75rem;padding:2px 8px;border-radius:6px;font-weight:500}
.tag-video{background:#E4EBF3;color:#33546D}
.tag-ppt{background:#F7E4DC;color:#C2452D}
.tag-pdf{background:#F0E4F3;color:#6A4C71}
.tag-doc{background:#E3EFE8;color:#1E5B4B}
.tag-audio{background:#F5ECD2;color:#96700F}
.tag-quiz{background:#E9E4F7;color:#5B4E8C}
.tag-live{background:#F8E5DD;color:#C2452D}
.tag-zip{background:#EDEAE2;color:#5F6B61}

/* ---------- 登录页 ---------- */
.login-wrap{display:flex;min-height:100vh}
.login-left{
  flex:1.15;background:var(--pine-d);color:#EFE8D6;position:relative;overflow:hidden;
  display:flex;flex-direction:column;justify-content:space-between;padding:56px 64px;
}
.login-left::before{
  content:"";position:absolute;inset:0;opacity:.06;pointer-events:none;
  background-image:radial-gradient(circle at 1px 1px,#fff 1.2px,transparent 0);
  background-size:26px 26px;
}
.login-brand{display:flex;align-items:center;gap:14px;position:relative}
.seal{
  width:46px;height:46px;border-radius:10px;background:var(--cinn);color:#FFF8EE;
  font-family:var(--fd);font-weight:900;font-size:1.5rem;display:flex;align-items:center;justify-content:center;
  box-shadow:0 4px 14px rgba(194,69,45,.45);flex:none;
}
.login-brand .t1{font-family:var(--fd);font-size:1.35rem;font-weight:700;letter-spacing:.06em}
.login-brand .t2{font-size:.72rem;letter-spacing:.28em;opacity:.55;text-transform:uppercase}
.login-hero{position:relative;max-width:560px}
.login-hero .prod-tag{
  display:inline-flex;align-items:center;gap:6px;margin-bottom:14px;
  font-size:.74rem;letter-spacing:.14em;color:#E9B44C;
  border:1px solid rgba(233,180,76,.35);border-radius:99px;padding:5px 12px;
}
.login-hero .vert{
  position:absolute;right:-30px;top:-40px;writing-mode:vertical-rl;
  font-family:var(--fd);font-size:1rem;letter-spacing:.6em;opacity:.22;
}
.login-hero h1{font-family:var(--fd);font-size:3.2rem;font-weight:900;line-height:1.28;letter-spacing:.02em}
.login-hero h1 em{font-style:normal;color:#E9B44C;position:relative}
.login-hero h1 em::after{content:"";position:absolute;left:0;right:0;bottom:6px;height:3px;background:var(--cinn);border-radius:2px}
.login-hero p{margin-top:20px;font-size:1.02rem;line-height:1.9;opacity:.75;max-width:46ch}
.login-feats{position:relative;display:grid;grid-template-columns:repeat(3,1fr);gap:16px;max-width:640px}
.lf{border:1px solid rgba(239,232,214,.18);border-radius:12px;padding:16px 18px;backdrop-filter:blur(2px)}
.lf .n{font-family:var(--fd);font-size:1.6rem;font-weight:700;color:#E9B44C}
.lf .t{font-weight:600;margin-top:2px}
.lf .d{font-size:.78rem;opacity:.6;margin-top:4px;line-height:1.6}
.login-right{
  flex:1;display:flex;align-items:center;justify-content:center;padding:48px 32px;
  background:
    radial-gradient(800px 400px at 110% -10%,rgba(30,91,75,.08),transparent),
    radial-gradient(600px 300px at -10% 110%,rgba(194,69,45,.07),transparent),
    var(--paper);
}
.login-card{width:100%;max-width:420px}
.login-mobile-brand{display:none}
@media(max-width:820px){
  .login-mobile-brand{display:flex;align-items:center;justify-content:center;gap:11px;margin-bottom:26px}
  .login-mobile-brand .seal{width:40px;height:40px;font-size:1.2rem}
  .login-mobile-brand .t1{font-family:var(--fd);font-size:1.15rem;font-weight:900;letter-spacing:.06em}
  .login-mobile-brand .t2{font-size:.68rem;color:var(--muted);letter-spacing:.08em;margin-top:2px}
}
.login-card .lc-top{text-align:center;margin-bottom:26px}
.login-card h2{font-family:var(--fd);font-size:1.7rem;font-weight:900}
.login-card .sub{color:var(--muted);font-size:.9rem;margin-top:6px}
.role-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:22px 0}
.role-tab{
  border:1.5px solid var(--line2);border-radius:12px;padding:14px 8px;text-align:center;
  background:var(--surface);transition:all .18s;cursor:pointer;
}
.role-tab .ri{width:40px;height:40px;margin:0 auto 8px;border-radius:11px;display:flex;align-items:center;justify-content:center;background:var(--surface2);color:var(--ink2);transition:all .18s}
.role-tab .rl{font-weight:600;font-size:.95rem}
.role-tab .rd{font-size:.72rem;color:var(--muted);margin-top:3px}
.role-tab.on{border-color:var(--pine);background:var(--pine-l);box-shadow:0 6px 16px -8px rgba(30,91,75,.4)}
.role-tab.on .ri{background:var(--pine);color:#fff}
.f-item{margin-bottom:14px}
.f-item label{display:block;font-size:.85rem;color:var(--ink2);margin-bottom:6px;font-weight:500}
.f-input{
  width:100%;padding:11px 14px;border:1.5px solid var(--line2);border-radius:10px;
  background:var(--surface);outline:none;transition:border .15s;
}
.f-input:focus{border-color:var(--pine)}
.login-tip{
  margin-top:16px;padding:12px 14px;border-radius:10px;background:var(--gold-l);
  border:1px dashed var(--gold);font-size:.8rem;color:#7A5E15;line-height:1.7;
}
.login-btn{width:100%;justify-content:center;padding:13px;font-size:1.02rem;border-radius:11px;margin-top:6px}

/* ---------- 应用骨架 ---------- */
.shell{display:flex;min-height:100vh}
.sidebar{
  width:228px;flex:none;background:var(--pine-d);color:#D8D2BE;
  display:flex;flex-direction:column;position:sticky;top:0;height:100vh;z-index:30;
}
.sb-brand{display:flex;align-items:center;gap:11px;padding:20px 20px 16px}
.sb-brand .t1{font-family:var(--fd);font-weight:700;font-size:1.12rem;color:#F3EEDB;letter-spacing:.05em}
.sb-brand .t2{font-size:.62rem;letter-spacing:.24em;opacity:.5;text-transform:uppercase}
.sb-role{
  margin:0 14px 14px;padding:8px 12px;border-radius:9px;background:rgba(255,255,255,.07);
  font-size:.78rem;display:flex;align-items:center;gap:8px;color:#EFE8D6;
}
.sb-role .dot{width:7px;height:7px;border-radius:50%;background:#E9B44C;flex:none}
.sb-nav{flex:1;padding:4px 12px;display:flex;flex-direction:column;gap:3px;overflow-y:auto}
.sb-item{
  display:flex;align-items:center;gap:11px;padding:10px 12px;border-radius:9px;
  font-size:.93rem;color:#C6C0AA;transition:all .15s;text-align:left;width:100%;
}
.sb-item:hover{background:rgba(255,255,255,.07);color:#F3EEDB}
.sb-item.on{background:rgba(233,180,76,.14);color:#E9B44C;font-weight:600}
.sb-item .badge-n{margin-left:auto;background:var(--cinn);color:#fff;font-size:.68rem;min-width:18px;height:18px;border-radius:9px;display:flex;align-items:center;justify-content:center;padding:0 5px}
.sb-foot{padding:14px;font-size:.72rem;color:rgba(216,210,190,.4);text-align:center;border-top:1px solid rgba(255,255,255,.08)}

.main{flex:1;min-width:0;display:flex;flex-direction:column}
.topbar{
  height:62px;flex:none;display:flex;align-items:center;gap:16px;padding:0 28px;
  background:rgba(252,250,243,.86);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;
}
.tb-hamb{display:none}
.tb-search{
  flex:0 1 380px;display:flex;align-items:center;gap:8px;padding:8px 14px;
  background:var(--surface2);border:1px solid var(--line);border-radius:10px;color:var(--muted);
}
.tb-search input{border:none;background:none;outline:none;flex:1;font-size:.9rem}
.tb-right{margin-left:auto;display:flex;align-items:center;gap:14px}
.tb-iconbtn{
  width:38px;height:38px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  color:var(--ink2);position:relative;transition:background .15s;
}
.tb-iconbtn:hover{background:var(--surface2)}
.tb-iconbtn .ndot{position:absolute;top:7px;right:8px;width:8px;height:8px;border-radius:50%;background:var(--cinn);border:2px solid var(--surface)}
.tb-user{display:flex;align-items:center;gap:10px;padding:5px 8px 5px 5px;border-radius:11px;cursor:pointer;transition:background .15s;position:relative}
.tb-user:hover{background:var(--surface2)}
.avatar{
  width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:600;font-size:.92rem;flex:none;font-family:var(--fd);
}
.tb-user .un{font-size:.9rem;font-weight:600;line-height:1.2}
.tb-user .ur{font-size:.7rem;color:var(--muted)}
.role-switch{padding:7px 12px;border:1.5px solid var(--line2);border-radius:9px;background:var(--surface);font-size:.83rem;font-weight:500;cursor:pointer;color:var(--ink2)}
.role-switch:hover{border-color:var(--pine)}

.dropdown{
  position:absolute;top:calc(100% + 8px);right:0;width:300px;
  background:var(--surface);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow-lg);
  z-index:50;overflow:hidden;animation:pop .16s ease;
}
@keyframes pop{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
.dd-head{padding:12px 16px;border-bottom:1px solid var(--line);font-weight:600;font-size:.9rem;display:flex;justify-content:space-between;align-items:center}
.dd-item{padding:12px 16px;border-bottom:1px solid var(--surface2);display:flex;gap:11px;cursor:pointer}
.dd-item:last-child{border-bottom:none}
.dd-item:hover{background:var(--surface2)}
.dd-item .di{width:34px;height:34px;border-radius:9px;display:flex;align-items:center;justify-content:center;flex:none}
.dd-item .dt{font-size:.87rem;font-weight:500;line-height:1.4}
.dd-item .dd{font-size:.76rem;color:var(--muted);margin-top:2px}
.dd-item .dtime{font-size:.7rem;color:var(--muted);margin-left:auto;flex:none}

.content{flex:1;padding:28px 32px 60px;max-width:1240px;width:100%;margin:0 auto;animation:fadeUp .3s ease}
@keyframes fadeUp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

.page-head{margin-bottom:22px}
.page-title{font-family:var(--fd);font-size:1.65rem;font-weight:900;display:flex;align-items:baseline;gap:12px}
.page-title .en{font-size:.72rem;color:var(--muted);letter-spacing:.22em;text-transform:uppercase;font-weight:400}
.page-sub{color:var(--muted);font-size:.9rem;margin-top:5px}

/* ---------- 学生端 · 学习首页 ---------- */
.hero-strip{
  display:grid;grid-template-columns:1.5fr 1fr;gap:20px;margin-bottom:22px;
}
.hero-main{
  position:relative;overflow:hidden;border-radius:18px;padding:30px 34px;color:#F3EEDB;
  background:linear-gradient(120deg,var(--pine-d) 0%,var(--pine) 78%,#2A6B58 100%);
  box-shadow:var(--shadow);
}
.hero-main::after{
  content:"学";position:absolute;right:22px;bottom:-38px;font-family:var(--fd);
  font-size:11rem;font-weight:900;color:rgba(255,255,255,.06);line-height:1;
}
.hero-main .hi{font-family:var(--fd);font-size:1.55rem;font-weight:700}
.hero-main .date{font-size:.82rem;opacity:.6;margin-top:4px}
.hero-stats{display:flex;gap:34px;margin-top:24px;position:relative;z-index:1}
.hstat .n{font-family:var(--fd);font-size:1.9rem;font-weight:900;color:#E9B44C;line-height:1.1}
.hstat .n small{font-size:.85rem;font-weight:400;color:rgba(243,238,219,.7);margin-left:3px}
.hstat .l{font-size:.78rem;opacity:.65;margin-top:3px}
.hero-side{display:flex;flex-direction:column;gap:14px}
.level-card{
  flex:1;background:var(--surface);border:1px solid var(--line);border-radius:18px;
  padding:18px 22px;display:flex;align-items:center;gap:18px;box-shadow:var(--shadow);
}
.level-ring{position:relative;flex:none}
.level-ring .lv{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center}
.level-ring .lv .n{font-family:var(--fd);font-weight:900;font-size:1.3rem;color:var(--pine)}
.level-ring .lv .l{font-size:.62rem;color:var(--muted)}
.level-info{flex:1;min-width:0}
.level-info .lt{font-weight:700;font-size:.98rem}
.level-info .ld{font-size:.78rem;color:var(--muted);margin:3px 0 8px}
.streak-card{
  background:linear-gradient(135deg,#B23A24,var(--cinn));color:#FFF3EA;border-radius:18px;
  padding:16px 22px;display:flex;align-items:center;gap:16px;box-shadow:var(--shadow);
}
.streak-card .flame{width:42px;height:42px;border-radius:12px;background:rgba(255,255,255,.14);display:flex;align-items:center;justify-content:center;flex:none}
.streak-card .n{font-family:var(--fd);font-size:1.5rem;font-weight:900}
.streak-card .l{font-size:.8rem;opacity:.85}

.grid-2{display:grid;grid-template-columns:1.6fr 1fr;gap:20px;align-items:start}
.grid-2r{display:grid;grid-template-columns:1fr 1.6fr;gap:20px;align-items:start}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}

.plan-item{display:flex;align-items:center;gap:12px;padding:11px 0;border-bottom:1px dashed var(--line)}
.plan-item:last-child{border-bottom:none}
.plan-check{
  width:21px;height:21px;border-radius:7px;border:1.5px solid var(--line2);flex:none;
  display:flex;align-items:center;justify-content:center;color:#fff;transition:all .15s;cursor:pointer;
}
.plan-check.done{background:var(--pine);border-color:var(--pine)}
.plan-item .pt{flex:1;font-size:.92rem}
.plan-item .pt.done{text-decoration:line-through;color:var(--muted)}
.plan-item .pm{font-size:.74rem;color:var(--muted);margin-top:1px}

/* 课程卡片 */
.course-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.course-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease;display:flex;flex-direction:column;
}
.course-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.cover{
  height:118px;position:relative;display:flex;align-items:center;padding:0 22px;overflow:hidden;
  background:var(--hue,#33546D);
}
.cover::before{
  content:"";position:absolute;inset:0;opacity:.13;
  background-image:repeating-linear-gradient(-45deg,#fff 0 1px,transparent 1px 9px);
}
.cover .char{
  font-family:var(--fd);font-size:3.4rem;font-weight:900;color:rgba(255,255,255,.92);
  text-shadow:0 4px 16px rgba(0,0,0,.25);line-height:1;
}
.cover .cat-label{
  position:absolute;top:12px;right:12px;font-size:.68rem;letter-spacing:.14em;
  background:rgba(0,0,0,.22);color:rgba(255,255,255,.92);padding:3px 10px;border-radius:99px;
}
.cover .seal-mini{
  position:absolute;right:14px;bottom:12px;width:30px;height:30px;border-radius:7px;
  background:rgba(194,69,45,.9);color:#FFF8EE;font-family:var(--fd);font-size:.85rem;font-weight:700;
  display:flex;align-items:center;justify-content:center;transform:rotate(-6deg);opacity:.9;
}
.cc-body{padding:16px 18px 14px;display:flex;flex-direction:column;gap:8px;flex:1}
.cc-title{font-weight:700;font-size:1rem;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.cc-meta{display:flex;align-items:center;gap:8px;font-size:.78rem;color:var(--muted);flex-wrap:wrap}
.cc-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;padding-top:10px;border-top:1px dashed var(--line)}
.cc-price{font-family:var(--fd);font-weight:700;color:var(--cinn);font-size:1.05rem}
.cc-price.free{color:var(--pine)}
.cc-prog{display:flex;align-items:center;gap:8px;font-size:.76rem;color:var(--muted)}

/* 继续学习横卡 */
.cont-card{
  display:flex;gap:18px;padding:18px;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:14px;align-items:center;
  transition:transform .18s;cursor:pointer;
}
.cont-card:hover{transform:translateX(4px)}
.cont-cover{width:120px;height:80px;border-radius:10px;flex:none;display:flex;align-items:center;justify-content:center;background:var(--hue);position:relative;overflow:hidden}
.cont-cover::before{content:"";position:absolute;inset:0;opacity:.13;background-image:repeating-linear-gradient(-45deg,#fff 0 1px,transparent 1px 9px)}
.cont-cover .char{font-family:var(--fd);font-size:2rem;font-weight:900;color:rgba(255,255,255,.92)}
.cont-info{flex:1;min-width:0}
.cont-info .t{font-weight:700;font-size:.98rem}
.cont-info .m{font-size:.78rem;color:var(--muted);margin:3px 0 8px}

/* ---------- 课程详情 ---------- */
.cd-hero{
  border-radius:18px;overflow:hidden;position:relative;color:#F5F1E4;
  background:var(--hue);padding:34px 38px;margin-bottom:22px;
}
.cd-hero::before{content:"";position:absolute;inset:0;opacity:.1;background-image:repeating-linear-gradient(-45deg,#fff 0 1px,transparent 1px 9px)}
.cd-hero .char-bg{position:absolute;right:30px;top:50%;transform:translateY(-50%);font-family:var(--fd);font-size:10rem;font-weight:900;color:rgba(255,255,255,.08);line-height:1}
.cd-hero .crumb{font-size:.8rem;opacity:.75;display:flex;gap:6px;align-items:center;cursor:pointer;width:fit-content}
.cd-hero h1{font-family:var(--fd);font-size:1.9rem;font-weight:900;margin:12px 0 10px;position:relative;max-width:70%}
.cd-hero .desc{opacity:.82;font-size:.92rem;max-width:60ch;position:relative}
.cd-hero .meta-row{display:flex;gap:22px;margin-top:18px;font-size:.84rem;position:relative;flex-wrap:wrap}
.cd-hero .meta-row span{display:inline-flex;align-items:center;gap:6px;opacity:.9}
.cd-actions{display:flex;gap:12px;margin-top:22px;position:relative}
.cd-actions .btn-ghost{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.3);color:#fff}
.cd-actions .btn-ghost:hover{border-color:#fff}
.cd-prog-ring{position:absolute;right:38px;bottom:30px;text-align:center;z-index:2}
.cd-prog-ring .rl{font-size:.7rem;opacity:.8;margin-top:4px}

.tabs{display:flex;gap:4px;border-bottom:2px solid var(--line);margin-bottom:20px;overflow-x:auto}
.tab{
  padding:10px 18px;font-size:.95rem;color:var(--muted);border-bottom:2px solid transparent;
  margin-bottom:-2px;transition:all .15s;font-weight:500;white-space:nowrap;display:flex;align-items:center;gap:7px;
}
.tab:hover{color:var(--ink)}
.tab.on{color:var(--pine);border-color:var(--cinn);font-weight:700}
.tab .cnt{font-size:.72rem;background:var(--surface2);border-radius:99px;padding:1px 7px;color:var(--muted)}

.chapter{margin-bottom:8px}
.chapter-head{
  display:flex;align-items:center;gap:10px;padding:13px 16px;background:var(--surface2);
  border-radius:11px;font-weight:700;font-size:.95rem;
}
.chapter-head .cn{font-family:var(--fd);color:var(--cinn)}
.chapter-head .cnt{margin-left:auto;font-size:.76rem;color:var(--muted);font-weight:400}
.lesson{
  display:flex;align-items:center;gap:13px;padding:13px 16px 13px 24px;border-bottom:1px dashed var(--line);
  transition:background .12s;cursor:pointer;
}
.lesson:hover{background:var(--surface2)}
.lesson:last-child{border-bottom:none}
.lesson .ls-ic{width:34px;height:34px;border-radius:9px;display:flex;align-items:center;justify-content:center;flex:none}
.lesson .lt{flex:1;min-width:0}
.lesson .lt .t{font-size:.93rem;font-weight:500}
.lesson .lt .m{font-size:.75rem;color:var(--muted);margin-top:1px}
.lesson .done-ic{color:var(--pine);flex:none}
.lesson .try{font-size:.72rem;color:var(--gold);border:1px solid var(--gold);border-radius:6px;padding:1px 7px}

.ware-row{
  display:flex;align-items:center;gap:14px;padding:14px 18px;border:1px solid var(--line);
  border-radius:12px;margin-bottom:10px;background:var(--surface);transition:all .15s;
}
.ware-row:hover{border-color:var(--pine);box-shadow:var(--shadow)}
.ware-ic{width:42px;height:42px;border-radius:11px;display:flex;align-items:center;justify-content:center;flex:none}
.ware-row .wt{flex:1;min-width:0}
.ware-row .wt .t{font-weight:600;font-size:.93rem}
.ware-row .wt .m{font-size:.76rem;color:var(--muted);margin-top:2px}

/* 作业卡片 */
.assign-card{
  border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;margin-bottom:14px;
  background:var(--surface);box-shadow:var(--shadow);
}
.assign-card .at{font-weight:700;font-size:1.02rem;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.assign-card .am{display:flex;gap:18px;margin-top:8px;font-size:.8rem;color:var(--muted);flex-wrap:wrap}
.assign-card .am b{color:var(--cinn);font-weight:600}
.assign-card .foot{display:flex;align-items:center;gap:12px;margin-top:14px;padding-top:14px;border-top:1px dashed var(--line)}
.score-badge{font-family:var(--fd);font-size:1.4rem;font-weight:900;color:var(--cinn)}
.comment-box{margin-top:12px;background:var(--gold-l);border-left:3px solid var(--gold);padding:12px 16px;border-radius:0 10px 10px 0;font-size:.88rem;color:#6B5413}

/* ---------- 报告 / 成就 ---------- */
.donut-wrap{display:flex;flex-direction:column;align-items:center;gap:8px}
.donut-wrap .dl{font-size:.82rem;color:var(--muted)}
.donut-wrap .dn{font-family:var(--fd);font-weight:900;font-size:1.35rem}
.badge-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.badge-item{
  border:1px solid var(--line);border-radius:var(--radius);padding:20px 14px;text-align:center;
  background:var(--surface);transition:transform .18s;position:relative;
}
.badge-item:hover{transform:translateY(-3px)}
.badge-item .bi{
  width:56px;height:56px;margin:0 auto 10px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  background:var(--gold-l);color:var(--gold);border:2px solid var(--gold);
}
.badge-item.locked{opacity:.55}
.badge-item.locked .bi{background:var(--surface2);color:var(--muted);border-color:var(--line2);filter:grayscale(1)}
.badge-item .bt{font-weight:700;font-size:.9rem}
.badge-item .bd{font-size:.72rem;color:var(--muted);margin-top:4px;line-height:1.5}
.badge-item .got{position:absolute;top:10px;right:10px;color:var(--pine)}
.heat{display:grid;grid-template-columns:repeat(24,1fr);gap:3px}
.heat i{aspect-ratio:1;border-radius:2.5px;background:var(--surface2)}
.heat i.h1{background:#CBDCD2}.heat i.h2{background:#9CC3B0}.heat i.h3{background:#5E9C82}.heat i.h4{background:var(--pine)}
.heat-legend{display:flex;align-items:center;gap:5px;font-size:.72rem;color:var(--muted);justify-content:flex-end;margin-top:8px}
.heat-legend i{width:10px;height:10px;border-radius:2.5px;display:inline-block}

/* ---------- 社区 ---------- */
.post{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);padding:20px 22px;margin-bottom:16px;box-shadow:var(--shadow)}
.post-head{display:flex;align-items:center;gap:12px}
.post-head .pn{font-weight:700;font-size:.93rem}
.post-head .ptime{font-size:.74rem;color:var(--muted)}
.post-text{margin:12px 0;font-size:.93rem;line-height:1.8;color:var(--ink2)}
.post-actions{display:flex;gap:20px;padding-top:10px;border-top:1px dashed var(--line)}
.pa{display:inline-flex;align-items:center;gap:6px;font-size:.83rem;color:var(--muted);transition:color .15s;cursor:pointer}
.pa:hover{color:var(--pine)}
.pa.liked{color:var(--cinn)}
.cmt-list{margin-top:14px;padding-top:12px;border-top:1px solid var(--surface2);display:flex;flex-direction:column;gap:10px}
.cmt{display:flex;gap:10px;font-size:.87rem}
.cmt .cb{background:var(--surface2);border-radius:4px 12px 12px 12px;padding:8px 14px;flex:1}
.cmt .ca{font-weight:600;font-size:.8rem;color:var(--pine)}
.cmt .ct{margin-top:2px;line-height:1.6}
.cmt-input{display:flex;gap:10px;margin-top:12px}
.cmt-input input{flex:1;padding:9px 14px;border:1px solid var(--line2);border-radius:99px;background:var(--surface);outline:none;font-size:.87rem}
.cmt-input input:focus{border-color:var(--pine)}

/* ---------- 教师端 ---------- */
.sched-item{display:flex;gap:14px;padding:13px 0;border-bottom:1px dashed var(--line);align-items:center}
.sched-item:last-child{border-bottom:none}
.sched-time{font-family:var(--fd);font-weight:700;color:var(--pine);width:56px;flex:none;text-align:center}
.sched-time .d{font-size:.66rem;color:var(--muted);font-family:var(--fb);font-weight:400}
.sched-bar{width:4px;align-self:stretch;border-radius:2px;background:var(--pine)}
.sched-bar.live{background:var(--cinn)}
.sched-bar.meet{background:var(--gold)}
.sched-info{flex:1}
.sched-info .t{font-weight:600;font-size:.93rem}
.sched-info .m{font-size:.76rem;color:var(--muted)}

.stat-card{padding:20px 22px;display:flex;align-items:center;gap:16px}
.stat-ic{width:46px;height:46px;border-radius:13px;display:flex;align-items:center;justify-content:center;flex:none}
.stat-card .n{font-family:var(--fd);font-size:1.65rem;font-weight:900;line-height:1.15}
.stat-card .l{font-size:.78rem;color:var(--muted)}
.stat-card .delta{font-size:.72rem;margin-left:auto;padding:2px 8px;border-radius:99px;font-weight:600;align-self:flex-start}
.delta.up{background:var(--pine-l);color:var(--pine)}
.delta.down{background:var(--cinn-l);color:var(--cinn)}

.tbl{width:100%;border-collapse:collapse;font-size:.9rem}
.tbl th{
  text-align:left;padding:11px 14px;font-size:.76rem;color:var(--muted);font-weight:600;
  border-bottom:1.5px solid var(--line2);letter-spacing:.04em;white-space:nowrap;
}
.tbl td{padding:13px 14px;border-bottom:1px solid var(--surface2);vertical-align:middle}
.tbl tr:last-child td{border-bottom:none}
.tbl tbody tr{transition:background .12s}
.tbl tbody tr:hover{background:var(--surface2)}
.tcell-main{display:flex;align-items:center;gap:11px;font-weight:600}
.tcell-sub{font-size:.75rem;color:var(--muted);font-weight:400;margin-top:1px}

/* 直播课堂 */
.live-wrap{display:grid;grid-template-columns:1fr 300px;gap:18px;align-items:stretch}
.board-stage{
  position:relative;background:#FDFDF8;border:1px solid var(--line2);border-radius:var(--radius);
  overflow:hidden;min-height:520px;box-shadow:var(--shadow);
  background-image:radial-gradient(circle at 1px 1px,#E8E1CC 1px,transparent 0);background-size:22px 22px;
}
.board-stage canvas{position:absolute;inset:0;width:100%;height:100%;cursor:crosshair;touch-action:none}
.board-tools{
  position:absolute;top:14px;left:50%;transform:translateX(-50%);display:flex;gap:6px;z-index:5;
  background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:6px;box-shadow:var(--shadow);
}
.bt-tool{width:36px;height:36px;border-radius:9px;display:flex;align-items:center;justify-content:center;color:var(--ink2);transition:all .12s}
.bt-tool:hover{background:var(--surface2)}
.bt-tool.on{background:var(--pine);color:#fff}
.bt-color{width:24px;height:24px;border-radius:50%;border:2px solid transparent;margin:6px 4px}
.bt-color.on{border-color:var(--ink);transform:scale(1.15)}
.live-status{
  position:absolute;top:14px;left:14px;z-index:5;display:flex;align-items:center;gap:8px;
  background:rgba(28,42,36,.85);color:#F3EEDB;padding:7px 14px;border-radius:99px;font-size:.8rem;
}
.live-status .rdot{width:8px;height:8px;border-radius:50%;background:#E4572E;animation:blink 1.2s infinite}
@keyframes blink{50%{opacity:.25}}
.live-side{display:flex;flex-direction:column;gap:14px;min-height:0}
.member-list{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:2px;max-height:250px}
.member{display:flex;align-items:center;gap:9px;padding:7px 10px;border-radius:8px;font-size:.86rem}
.member:hover{background:var(--surface2)}
.member .mstate{margin-left:auto;color:var(--muted)}
.member .mstate.hand{color:var(--gold)}
.chat-box{display:flex;flex-direction:column;min-height:0}
.chat-list{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:9px;padding:4px 2px;min-height:120px;max-height:190px}
.chat-msg{font-size:.84rem;line-height:1.5}
.chat-msg .ca{font-weight:600;color:var(--pine);font-size:.78rem}
.chat-msg.me .ca{color:var(--cinn)}
.chat-input{display:flex;gap:8px;margin-top:10px}
.chat-input input{flex:1;padding:8px 13px;border:1px solid var(--line2);border-radius:9px;background:var(--surface);outline:none;font-size:.86rem}
.chat-input input:focus{border-color:var(--pine)}

/* ---------- 机构端 ---------- */
.kpi-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-bottom:20px}
.alert-item{display:flex;gap:12px;padding:12px 0;border-bottom:1px dashed var(--line);align-items:flex-start}
.alert-item:last-child{border-bottom:none}
.alert-ic{width:34px;height:34px;border-radius:9px;flex:none;display:flex;align-items:center;justify-content:center}

.legend{display:flex;flex-wrap:wrap;gap:12px;font-size:.78rem;color:var(--ink2);margin-top:10px}
.legend i{width:10px;height:10px;border-radius:3px;display:inline-block;margin-right:5px;vertical-align:-1px}

/* ---------- 弹窗 / 通知 ---------- */
.modal-mask{
  position:fixed;inset:0;background:rgba(28,42,36,.5);backdrop-filter:blur(3px);
  z-index:100;display:flex;align-items:center;justify-content:center;padding:24px;animation:fade .18s ease;
}
@keyframes fade{from{opacity:0}to{opacity:1}}
.modal{
  background:var(--surface);border-radius:18px;width:100%;max-width:560px;max-height:88vh;
  overflow-y:auto;box-shadow:var(--shadow-lg);animation:pop .2s ease;border:1px solid var(--line);
}
.modal.wide{max-width:820px}
.modal.xl{max-width:980px}
.modal-head{display:flex;align-items:center;justify-content:space-between;padding:20px 26px 0}
.modal-title{font-family:var(--fd);font-size:1.25rem;font-weight:900}
.modal-body{padding:18px 26px 26px}
.modal-close{width:34px;height:34px;border-radius:9px;display:flex;align-items:center;justify-content:center;color:var(--muted)}
.modal-close:hover{background:var(--surface2);color:var(--ink)}

/* 视频播放器模拟 */
.player{background:#15211D;border-radius:14px;overflow:hidden;color:#E9E4D2}
.player-screen{height:300px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;position:relative}
.player-screen .big-play{
  width:70px;height:70px;border-radius:50%;background:rgba(233,180,76,.95);color:#15211D;
  display:flex;align-items:center;justify-content:center;transition:transform .15s;
}
.player-screen .big-play:hover{transform:scale(1.08)}
.player-screen .ptitle{position:absolute;top:16px;left:18px;font-size:.85rem;opacity:.8}
.player-screen .resume-tag{position:absolute;top:16px;right:18px;font-size:.72rem;background:rgba(194,69,45,.9);padding:3px 10px;border-radius:99px}
.player-bar{display:flex;align-items:center;gap:12px;padding:12px 16px;font-size:.78rem}
.player-track{flex:1;height:5px;background:rgba(255,255,255,.18);border-radius:99px;overflow:hidden}
.player-track>i{display:block;height:100%;background:#E9B44C;border-radius:99px;animation:playprog 8s linear forwards}
@keyframes playprog{from{width:32%}to{width:96%}}
.player-speed{border:1px solid rgba(255,255,255,.3);border-radius:6px;padding:2px 8px;cursor:pointer}

/* 测验 */
.q-opt{
  display:flex;align-items:center;gap:12px;border:1.5px solid var(--line2);border-radius:11px;
  padding:13px 16px;margin-bottom:10px;cursor:pointer;transition:all .14s;font-size:.93rem;
}
.q-opt:hover{border-color:var(--pine);background:var(--pine-l)}
.q-opt .qk{width:26px;height:26px;border-radius:50%;border:1.5px solid var(--line2);display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:600;flex:none;transition:all .14s}
.q-opt.picked{border-color:var(--pine);background:var(--pine-l)}
.q-opt.picked .qk{background:var(--pine);border-color:var(--pine);color:#fff}
.q-opt.right{border-color:var(--pine);background:var(--pine-l)}
.q-opt.right .qk{background:var(--pine);border-color:var(--pine);color:#fff}
.q-opt.wrong{border-color:var(--cinn);background:var(--cinn-l)}
.q-opt.wrong .qk{background:var(--cinn);border-color:var(--cinn);color:#fff}
.q-explain{background:var(--gold-l);border-radius:10px;padding:12px 16px;font-size:.85rem;color:#6B5413;margin-top:6px;line-height:1.7}
.q-result{text-align:center;padding:20px 0}
.q-result .score{font-family:var(--fd);font-size:3.4rem;font-weight:900;color:var(--pine)}
.q-result .score small{font-size:1.2rem;color:var(--muted)}

/* PPT 预览 */
.ppt-view{background:#15211D;border-radius:12px;padding:18px;display:flex;gap:14px}
.ppt-main{flex:1;aspect-ratio:4/3;background:var(--surface);border-radius:9px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;position:relative;overflow:hidden}
.ppt-main .slide-deco{position:absolute;inset:0;opacity:.07;background:var(--hue,#33546D)}
.ppt-main .st{font-family:var(--fd);font-size:1.35rem;font-weight:900;color:var(--ink);z-index:1;padding:0 30px;text-align:center}
.ppt-main .ss{font-size:.82rem;color:var(--muted);z-index:1}
.ppt-thumbs{width:88px;display:flex;flex-direction:column;gap:8px;overflow-y:auto;max-height:340px}
.ppt-thumb{aspect-ratio:4/3;border-radius:6px;background:var(--surface);border:2px solid transparent;cursor:pointer;display:flex;align-items:center;justify-content:center;font-family:var(--fd);color:var(--muted);font-size:.8rem;flex:none}
.ppt-thumb.on{border-color:#E9B44C;color:var(--ink)}

/* Toast */
#toast-root{position:fixed;top:76px;left:50%;transform:translateX(-50%);z-index:200;display:flex;flex-direction:column;gap:10px;align-items:center;pointer-events:none}
.toast{
  display:flex;align-items:center;gap:10px;background:var(--ink);color:#F3EEDB;
  padding:11px 20px;border-radius:12px;font-size:.9rem;box-shadow:var(--shadow-lg);
  animation:toastIn .25s cubic-bezier(.2,.9,.3,1.2);
}
.toast.xp{background:var(--gold);color:#fff}
.toast.err{background:var(--cinn);color:#fff}
@keyframes toastIn{from{opacity:0;transform:translateY(-12px) scale(.94)}to{opacity:1;transform:none}}
.toast.out{transition:all .3s;opacity:0;transform:translateY(-8px)}

.empty{
  text-align:center;padding:48px 20px;color:var(--muted);
}
.empty .ei{width:60px;height:60px;margin:0 auto 12px;border-radius:16px;background:var(--surface2);display:flex;align-items:center;justify-content:center;color:var(--line2)}
.empty .et{font-size:.92rem}
.empty .ed{font-size:.78rem;margin-top:4px}

/* 响应式 */
@media(max-width:1100px){
  .grid-4,.kpi-grid{grid-template-columns:repeat(2,1fr)}
  .grid-3,.course-grid{grid-template-columns:repeat(2,1fr)}
  .grid-2,.grid-2r,.hero-strip{grid-template-columns:1fr}
  .badge-grid{grid-template-columns:repeat(3,1fr)}
  .live-wrap{grid-template-columns:1fr}
  .cd-prog-ring{display:none}
}
@media(max-width:820px){
  .sidebar{position:fixed;left:0;top:0;transform:translateX(-100%);transition:transform .25s ease;box-shadow:var(--shadow-lg)}
  .sidebar.open{transform:none}
  .tb-hamb{display:flex}
  .content{padding:20px 16px 60px}
  .login-left{display:none}
  .tb-search{flex:1}
  .tb-user .uu{display:none}
  .role-switch{display:none}
  .course-grid{grid-template-columns:1fr}
  .badge-grid{grid-template-columns:repeat(2,1fr)}
  .heat{grid-template-columns:repeat(12,1fr)}
  .login-hero h1{font-size:2.2rem}
  .cd-hero h1{max-width:100%}
}

/* ---------- 课件真实上传 ---------- */
.up-drop{display:block;border:1.5px dashed var(--line2);border-radius:14px;padding:26px 20px;text-align:center;cursor:pointer;background:var(--surface2);transition:.18s;margin-bottom:14px}
.up-drop:hover,.up-drop.on{border-color:var(--pine);background:var(--pine-l)}
.up-ic{width:52px;height:52px;border-radius:50%;background:#fff;color:var(--pine);display:flex;align-items:center;justify-content:center;margin:0 auto 10px;border:1px solid var(--line)}
.up-t{font-weight:700;font-size:.92rem}
.up-d{font-size:.76rem;color:var(--muted);margin-top:5px}
.up-list{display:flex;flex-direction:column;gap:8px}
.up-empty{font-size:.8rem;color:var(--muted);text-align:center;padding:12px;border:1px dashed var(--line);border-radius:10px}
.up-row{display:flex;align-items:center;gap:10px;padding:9px 11px;border:1px solid var(--line);border-radius:10px;background:#fff}
.up-ric{width:34px;height:34px;border-radius:8px;display:flex;align-items:center;justify-content:center;flex:none}
.up-info{flex:1;min-width:0}
.up-name{font-size:.82rem;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.up-meta{font-size:.72rem;color:var(--muted);margin-top:2px}
.up-err{color:var(--cinn)}
.up-bar{height:4px;border-radius:99px;background:var(--line);margin-top:6px;overflow:hidden}
.up-bar i{display:block;height:100%;background:var(--pine);transition:width .18s;width:0}
.up-state{font-size:.72rem;color:var(--muted);flex:none}
.up-row.up-fail{border-color:#E8C3B9;background:#FCF2EF}
.ware-text{background:var(--surface2);border:1px solid var(--line);border-radius:10px;padding:20px;max-height:520px;overflow:auto;white-space:pre-wrap;font-size:.84rem;line-height:1.8;color:var(--ink2)}
@media(max-width:560px){.up-drop{padding:20px 14px}.up-row .up-state{display:none}}

/* ---------- 学生端 · 直播教室 ---------- */
.sc-wrap{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:12px}
.sc-stage{background:#121C2A;border-radius:14px;overflow:hidden;display:flex;flex-direction:column;min-width:0}
.sc-video{position:relative;height:150px;display:flex;align-items:center;gap:14px;justify-content:center;color:#fff;background:radial-gradient(circle at 50% 20%,#243B57,#0E1725 75%)}
.sc-livetag{position:absolute;top:10px;left:10px;font-size:.68rem;padding:2px 8px;border-radius:99px;background:#D14343;color:#fff;letter-spacing:.04em}
.sc-boardwrap{position:relative;background:#FDFDF8}
#stu-board{display:block;width:100%;touch-action:none;cursor:crosshair}
.sc-tools{position:absolute;left:10px;bottom:10px;display:flex;align-items:center;gap:6px;background:rgba(255,255,255,.94);border:1px solid var(--line);border-radius:10px;padding:5px 7px;box-shadow:var(--shadow)}
.sc-side{display:flex;flex-direction:column;gap:10px;min-width:0}
.sc-members,.sc-chat{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:11px 12px;min-width:0}
.sc-members{flex:none}
.sc-mt{font-size:.76rem;font-weight:700;color:var(--ink);margin-bottom:7px;letter-spacing:.02em}
.sc-mlist{max-height:112px;overflow:auto;display:flex;flex-direction:column;gap:2px}
.sc-mrow{display:flex;align-items:center;gap:7px;font-size:.78rem;padding:3px 0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sc-mav{width:22px;height:22px;border-radius:50%;color:#fff;display:flex;align-items:center;justify-content:center;font-size:.68rem;flex:none}
.sc-mtag{margin-left:auto;font-size:.64rem;color:var(--muted);border:1px solid var(--line);border-radius:99px;padding:0 6px}
.sc-chat{flex:1;display:flex;flex-direction:column;min-height:0}
.sc-chatlist{flex:1;height:132px;max-height:132px;overflow:auto;border:1px solid var(--line);border-radius:9px;padding:8px 9px;background:var(--surface2);font-size:.76rem;line-height:1.6}
.sc-chat .chat-input{display:flex;gap:6px;margin-top:8px}
.sc-chat .chat-input input{flex:1;min-width:0;border:1px solid var(--line);border-radius:8px;padding:7px 9px;font-size:.78rem;font-family:inherit;background:#fff}
.sc-ctrl{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-top:12px}
.sc-ctrl .btn.on{border-color:var(--pine);color:var(--pine);background:var(--pine-l)}
@media(max-width:760px){.sc-wrap{grid-template-columns:1fr}.sc-video{height:118px}#stu-board{height:200px!important}.sc-chatlist{height:110px;max-height:110px}}

/* ---------- 课堂聊天的双语翻译 ---------- */
.chat-tr{margin-top:3px;font-size:.72rem;color:var(--muted);line-height:1.55;font-style:italic;word-break:break-word}
.chat-tr:empty{display:none}
.tr-tag{display:inline-block;font-style:normal;font-size:.6rem;letter-spacing:.04em;border:1px solid var(--line);border-radius:4px;padding:0 4px;margin-right:5px;color:var(--muted);vertical-align:1px}
.chat-quick{display:flex;gap:5px;flex-wrap:wrap;margin:8px 0 6px}
.chat-quick button{font:inherit;font-size:.68rem;padding:2px 8px;border:1px solid var(--line);border-radius:99px;background:var(--surface2);color:var(--ink2);cursor:pointer;transition:.15s}
.chat-quick button:hover{border-color:var(--pine);color:var(--pine);background:var(--pine-l)}

/* ---------- 手写板 ---------- */
#hw-root{position:fixed;inset:0;z-index:1200;display:none}
#hw-root.on{display:block}
.hw-mask{position:absolute;inset:0;background:rgba(16,24,38,.55);display:flex;align-items:center;justify-content:center;padding:18px}
.hw-box{background:var(--surface);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow-lg);padding:16px;width:min(620px,94vw);animation:pop .18s ease}
.hw-head{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.hw-head b{font-family:var(--fd);font-size:1.05rem}
.hw-head span{font-size:.74rem;color:var(--muted);flex:1}
#hw-canvas{display:block;width:100%;height:280px;background:#FDFDF8;border:1px solid var(--line);border-radius:10px;touch-action:none;cursor:crosshair}
.hw-tools{display:flex;align-items:center;gap:7px;flex-wrap:wrap;margin-top:10px}
.hw-img{display:block;max-width:200px;border:1px solid var(--line);border-radius:8px;background:#fff;margin-top:4px}
.hw-btn{flex:none}
@media(max-width:560px){#hw-canvas{height:220px}}