/* ============ 一诺学堂 · 全局样式 ============ */
:root{
  --bg:#f2f5fb; --card:#fff; --line:#e5eaf3;
  --ink:#1f2733; --sub:#66738a; --brand:#4f6ef7; --brand2:#6a5cf5;
  --green:#16a34a; --green-bg:#e8f7ee; --red:#dc2626; --red-bg:#fdecec;
  --amber:#d97706; --amber-bg:#fdf3e3; --blue:#2563eb; --blue-bg:#e8f0fe;
  --violet:#7c3aed; --violet-bg:#f1eafd; --cyan:#0e7490; --cyan-bg:#e0f4f8;
  --radius:14px; --shadow:0 1px 2px rgba(23,35,61,.05),0 6px 18px -8px rgba(23,35,61,.12);
  --shadow-lg:0 12px 34px -10px rgba(23,35,61,.25);
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--ink);font-size:14px;-webkit-font-smoothing:antialiased}
#app{display:flex;height:100vh;overflow:hidden}

/* ---------- 侧栏 ---------- */
.sidebar{width:224px;min-width:224px;background:linear-gradient(180deg,#25315c 0%,#1b2340 100%);color:#c9d4f0;display:flex;flex-direction:column;padding:18px 12px}
.brand{display:flex;align-items:center;gap:10px;padding:4px 8px 16px;border-bottom:1px solid rgba(255,255,255,.08);margin-bottom:10px}
.brand-logo{width:38px;height:38px;border-radius:11px;background:linear-gradient(135deg,#5b8cff,#8a63ff);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;font-size:15px;letter-spacing:1px;box-shadow:0 4px 12px rgba(90,110,255,.4)}
.brand-name{font-size:13px;font-weight:600;color:#fff;line-height:1.35}
#nav{flex:1;overflow:auto;padding-top:6px}
.nav-item{display:flex;align-items:center;gap:10px;padding:10px 12px;margin:2px 0;border-radius:10px;cursor:pointer;color:#b9c6e6;font-size:14px;transition:.15s;border:none;background:none;width:100%;text-align:left}
.nav-item:hover{background:rgba(255,255,255,.07);color:#fff}
.nav-item.active{background:linear-gradient(90deg,#4f6ef7,#6a5cf5);color:#fff;box-shadow:0 6px 14px -6px rgba(79,110,247,.6)}
.nav-item .ico{width:18px;text-align:center;font-size:15px}
.sidebar-foot{padding:10px 6px 0;border-top:1px solid rgba(255,255,255,.08)}
.ai-pill{display:flex;align-items:center;gap:8px;font-size:12px;padding:8px 10px;border-radius:20px;background:rgba(255,255,255,.08);color:#c9d4f0}
.ai-pill .dot{width:8px;height:8px;border-radius:50%;background:#4ade80;box-shadow:0 0 8px #4ade80}
.ai-pill.off .dot{background:#94a3b8;box-shadow:none}
.ai-pill.ai .dot{background:#facc15;box-shadow:0 0 8px #facc15}

/* ---------- 主区 ---------- */
.main{flex:1;display:flex;flex-direction:column;overflow:hidden}
.topbar{height:58px;background:var(--card);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 22px;flex-shrink:0}
.crumbs{font-size:16px;font-weight:700}
.top-actions{display:flex;gap:8px;align-items:center}
.content{flex:1;overflow:auto;padding:22px;scroll-behavior:smooth}

/* ---------- 通用组件 ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px;margin-bottom:16px}
.card h3{margin:0 0 12px;font-size:15px}
.card .sub{color:var(--sub);font-size:12.5px}
.grid{display:grid;gap:14px}
.g2{grid-template-columns:repeat(2,1fr)} .g3{grid-template-columns:repeat(3,1fr)} .g4{grid-template-columns:repeat(4,1fr)}
.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.space-between{justify-content:space-between}
.mt8{margin-top:8px}.mt12{margin-top:12px}.mt16{margin-top:16px}.mb8{margin-bottom:8px}.mb12{margin-bottom:12px}
.muted{color:var(--sub)}
.small{font-size:12.5px}
.big{font-size:22px;font-weight:800}
button{font-family:inherit;cursor:pointer;border:1px solid var(--line);background:#fff;color:var(--ink);padding:8px 14px;border-radius:10px;font-size:13.5px;transition:.15s;display:inline-flex;align-items:center;gap:6px}
button:hover{border-color:#b9c6e6;background:#f6f8fd}
button.primary{background:linear-gradient(135deg,#4f6ef7,#6a5cf5);color:#fff;border:none;box-shadow:0 6px 14px -6px rgba(79,110,247,.6)}
button.primary:hover{filter:brightness(1.06)}
button.success{background:var(--green);color:#fff;border:none}
button.danger{background:var(--red-bg);color:var(--red);border:1px solid #f5c6c6}
button.ghost{background:transparent;border-color:transparent;color:var(--sub)}
button.sm{padding:5px 10px;font-size:12.5px;border-radius:8px}
button:disabled{opacity:.5;cursor:not-allowed}
button.warn{background:var(--amber-bg);color:var(--amber);border-color:#f3dcb8}
input,select,textarea{font-family:inherit;font-size:13.5px;padding:8px 11px;border:1px solid #d6ddeb;border-radius:10px;background:#fff;color:var(--ink);outline:none}
input:focus,select:focus,textarea:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(79,110,247,.12)}
textarea{resize:vertical;line-height:1.6}
select{appearance:auto}
label.fld{display:flex;flex-direction:column;gap:6px;font-size:12.5px;color:var(--sub)}
label.fld .req{color:var(--red)}
.tag{display:inline-flex;align-items:center;gap:5px;padding:3px 10px;border-radius:20px;font-size:12px;font-weight:600}
.tag.blue{background:var(--blue-bg);color:var(--blue)} .tag.green{background:var(--green-bg);color:var(--green)}
.tag.red{background:var(--red-bg);color:var(--red)} .tag.amber{background:var(--amber-bg);color:var(--amber)}
.tag.violet{background:var(--violet-bg);color:var(--violet)} .tag.gray{background:#eef1f6;color:var(--sub)} .tag.cyan{background:var(--cyan-bg);color:var(--cyan)}
.badge{display:inline-flex;align-items:center;justify-content:center;min-width:22px;height:22px;padding:0 7px;border-radius:11px;font-size:12px;font-weight:700}
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px}
.stat-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow)}
.stat-card .label{color:var(--sub);font-size:12.5px}
.stat-card .value{font-size:26px;font-weight:800;margin-top:4px}
table{width:100%;border-collapse:collapse;font-size:13.5px}
th{text-align:left;color:var(--sub);font-weight:600;font-size:12.5px;padding:8px 10px;border-bottom:2px solid var(--line);white-space:nowrap}
td{padding:9px 10px;border-bottom:1px solid #eef1f7;vertical-align:middle}
tr:hover td{background:#f8faff}
.table-wrap{overflow:auto;max-height:520px}
.empty{padding:46px 10px;text-align:center;color:var(--sub)}
.empty .big-ico{font-size:44px;margin-bottom:8px}
.mini-chart{width:100%}
canvas{display:block}
.progress{height:8px;border-radius:6px;background:#eef1f6;overflow:hidden}
.progress>i{display:block;height:100%;border-radius:6px;background:linear-gradient(90deg,#4f6ef7,#6a5cf5)}
.score-good{color:var(--green);font-weight:800}
.score-mid{color:var(--amber);font-weight:800}
.score-bad{color:var(--red);font-weight:800}

/* ---------- 弹窗 ---------- */
.modal-mask{position:fixed;inset:0;background:rgba(15,23,42,.45);backdrop-filter:blur(3px);z-index:60;display:flex;align-items:flex-start;justify-content:center;padding:4vh 16px;overflow:auto}
.modal{background:#fff;border-radius:18px;box-shadow:var(--shadow-lg);max-width:860px;width:100%;padding:22px;margin-bottom:40px;animation:pop .18s ease}
.modal.wide{max-width:1100px}
.modal.narrow{max-width:520px}
@keyframes pop{from{transform:translateY(8px);opacity:0}to{transform:none;opacity:1}}
.modal-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px}
.modal-head h2{margin:0;font-size:17px}
.modal-close{border:none;background:#f1f3f8;border-radius:9px;width:32px;height:32px;flex:0 0 32px;padding:0;margin:0;font-size:19px;font-weight:600;line-height:1;color:var(--sub);display:inline-flex;align-items:center;justify-content:center;text-align:center}
.modal-close:hover{background:#e5e9f2}

/* ---------- Toast ---------- */
#toastWrap{position:fixed;top:18px;right:18px;z-index:100;display:flex;flex-direction:column;gap:8px}
.toast{background:#1f2733;color:#fff;padding:10px 16px;border-radius:10px;box-shadow:var(--shadow-lg);font-size:13.5px;animation:pop .2s;max-width:340px}
.toast.ok{background:#0f7a3d}.toast.err{background:#b91c1c}

/* ---------- 作业/答题卡行 ---------- */
.hw-card{display:flex;align-items:center;gap:14px;border:1px solid var(--line);border-radius:14px;padding:14px 16px;background:#fff;box-shadow:var(--shadow);margin-bottom:12px;flex-wrap:wrap}
.hw-card .hw-info{flex:1;min-width:220px}
.hw-card .hw-title{font-weight:700;font-size:15px}
.q-row{display:flex;gap:12px;padding:10px;border-bottom:1px dashed var(--line);align-items:flex-start}
.q-row:last-child{border-bottom:none}
.q-no{min-width:34px;height:34px;border-radius:9px;background:#eef2ff;color:#3b51d6;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px;flex-shrink:0}
.q-type{font-size:11.5px;padding:1px 8px;border-radius:12px;background:#eef1f6;color:var(--sub)}

/* ---------- 扫描页 ---------- */
.panel{border:1px solid var(--line);border-radius:14px;background:#fff;padding:16px;box-shadow:var(--shadow)}
.step-no{width:26px;height:26px;border-radius:50%;background:linear-gradient(135deg,#4f6ef7,#6a5cf5);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:800;font-size:13px;margin-right:8px}
.img-preview{max-width:100%;border-radius:10px;border:1px solid var(--line);max-height:420px}
.answer-cell{font-family:"SFMono-Regular",Consolas,Menlo,monospace}
.status-chip{width:26px;height:26px;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;font-weight:800}
.status-chip.correct{background:var(--green-bg);color:var(--green)}
.status-chip.wrong{background:var(--red-bg);color:var(--red)}
.status-chip.empty{background:#eef1f6;color:var(--sub)}
.drop-zone{border:2px dashed #c3cde6;border-radius:14px;padding:26px;text-align:center;color:var(--sub);cursor:pointer;transition:.15s;background:#fafbff}
.drop-zone:hover,.drop-zone.over{border-color:var(--brand);background:#f3f6ff;color:var(--brand)}
.camera-box video{width:100%;border-radius:12px;background:#111}


/* 家长报告整页打印模式 */
@media print{
  body.printing .sidebar, body.printing .topbar{display:none !important}
  body.printing .main, body.printing .content{overflow:visible !important;height:auto}
  .no-print{display:none !important}
  body.printing .content{padding:0}
  .print-only{display:block}
}
.print-only{display:none}

/* ---------- 打印（答题卡 / 家长报告） ---------- */
@media print{
  body *{visibility:hidden}
  #printRoot,#printRoot *{visibility:visible}
  #printRoot{position:absolute;left:0;top:0;width:100%;box-shadow:none !important;margin:0 !important;padding:0 !important}
  .no-print{display:none !important}
}
.print-sheet{background:#fff;color:#111;font-size:14px;line-height:1.8;padding:34px}
.print-sheet h1{text-align:center;font-size:20px;margin:0 0 4px}
.print-sheet .center{text-align:center}
.print-sheet .meta-line{display:flex;gap:30px;justify-content:center;margin:12px 0}
.print-sheet .under{display:inline-block;border-bottom:1px solid #111;min-width:120px}
.print-sheet .cardline{display:flex;align-items:center;gap:10px;padding:7px 6px;border-bottom:1px dotted #bbb}
.print-sheet .cardline .no{width:34px;font-weight:700}
.print-sheet .cardline .slot{flex:1}
.print-sheet .cardline .slot .blank{display:inline-block;min-width:150px;border-bottom:1px solid #555}
.print-sheet .section-title{font-weight:700;margin:14px 0 6px;background:#f1f3f8;padding:4px 8px}
.paper{width:100%;border:1px solid var(--line);border-radius:6px;margin-bottom:10px;page-break-inside:avoid}
.report-cover h1{font-size:22px;margin:0 0 2px}
.report-box{border:1px solid #e2e8f0;border-radius:12px;padding:16px;margin-bottom:14px}
.report-box h4{margin:0 0 10px;font-size:15px;border-left:4px solid var(--brand);padding-left:8px}

/* ---------- 其它 ---------- */
.student-chip{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);background:#fff;padding:6px 12px;border-radius:20px;cursor:pointer;font-size:13px}
.student-chip.sel{border-color:var(--brand);background:var(--blue-bg);font-weight:600}
.kb-row{display:flex;justify-content:space-between;gap:10px;padding:10px 2px;border-bottom:1px dashed var(--line)}
.check-line{display:flex;gap:8px;align-items:center;padding:4px 0;cursor:pointer}
.check-line input{width:16px;height:16px;accent-color:var(--brand)}
::-webkit-scrollbar{width:9px;height:9px}
::-webkit-scrollbar-thumb{background:#cbd3e3;border-radius:6px}
::-webkit-scrollbar-track{background:transparent}
.divider{height:1px;background:var(--line);margin:14px 0}
.legend{display:flex;gap:14px;font-size:12px;color:var(--sub);flex-wrap:wrap}
.legend i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:5px}

/* ============ 分辨率自适应 & 图标对齐 ============ */
.nav-item{white-space:nowrap}
.nav-item .ico{width:22px;height:22px;display:inline-flex;align-items:center;justify-content:center;flex:none;line-height:1}
.nav-item .ico svg{width:18px;height:18px;flex:none}
button svg, .tag svg, .q-no svg{vertical-align:-2px}
.ico-big{width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:12px}
.stat-card{min-width:0}
.content{min-width:0}

/* 大屏稍窄（1280 及以下）：四列变两列 */
@media (max-width:1280px){
  .g4{grid-template-columns:repeat(2,1fr)}
}
/* 中屏（1100 及以下）：侧栏收窄、三列变两列、内边距收小 */
@media (max-width:1100px){
  .sidebar{width:196px;min-width:196px;padding:16px 10px}
  .g3{grid-template-columns:repeat(2,1fr)}
  .content{padding:16px}
  .topbar{padding:0 16px}
  .modal{max-width:min(94vw,860px)}
  .modal.wide{max-width:min(96vw,1100px)}
}
/* 小屏 / 低分辨率窗口（880 及以下）：两列变一列、字号微调 */
@media (max-width:880px){
  .g2{grid-template-columns:1fr}
  .g3,.g4{grid-template-columns:repeat(2,1fr)}
  .stat-grid{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}
  .sidebar{width:64px;min-width:64px;padding:16px 6px}
  .sidebar .brand{padding:2px 0 12px;justify-content:center}
  .sidebar .brand-name{display:none}
  .nav-item{justify-content:center;padding:11px 0}
  .nav-item .ico{width:22px;height:22px}
  .nav-item{font-size:0}
  .sidebar-foot .ai-pill span:not(.dot){display:none}
  .sidebar-foot .ai-pill{justify-content:center;padding:6px}
  .content{padding:12px}
  .hw-card .hw-info{min-width:160px}
  .crumbs{font-size:15px}
  table{font-size:12.5px}
  .row{gap:8px}
}
/* 手机宽度（560 及以下）：单列到底、按钮全宽合理换行 */
@media (max-width:560px){
  .g2,.g3,.g4{grid-template-columns:1fr}
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .modal{padding:16px}
  .topbar{height:52px}
  .report-box{overflow-x:auto}
  .meta-line{flex-wrap:wrap;gap:8px}
}

/* ============ 一诺学堂 品牌 ============ */
.yn-logo{flex:none;display:inline-block;vertical-align:-4px}
.yn-print-brand{display:flex;align-items:center;justify-content:center;gap:8px;margin-bottom:12px;color:#1f2733;font-size:15px}
.yn-print-brand svg{vertical-align:-4px}
.brand-name{line-height:1.3}
.brand-sub{font-size:10.5px;color:#aebcf0;font-weight:400;letter-spacing:.3px;margin-top:2px}
.brand-logo{overflow:hidden}
.brand-logo .yn-logo{width:34px;height:34px}

/* ============ 作业管理工具栏对齐 ============ */
.toolbar-row{align-items:flex-end;flex-wrap:wrap;row-gap:10px}
.toolbar-row .fld{gap:6px;justify-content:flex-end}
.toolbar-row select{height:38px;padding:0 11px}
.toolbar-row button{height:38px;padding:0 14px;justify-content:center;line-height:1}
.toolbar-row .btn-group{align-items:flex-end}

/* ============ 图标按钮统一高度（作业卡片/弹窗） ============ */
.hw-card .hw-actions{align-items:center;gap:8px;flex-wrap:wrap}
.hw-card .hw-actions button{height:32px;padding:0 11px;justify-content:center;line-height:1;white-space:nowrap}
.modal-actions{align-items:center;gap:8px;flex-wrap:wrap}
.modal-actions button{height:34px;padding:0 13px;justify-content:center;line-height:1;white-space:nowrap}

/* ============ 作业图片批改标记（✓ / ✗） ============ */
.yn-annotated{position:relative;display:inline-block;max-width:100%;line-height:0}
.yn-annotated img{display:block;width:100%;height:auto;border-radius:10px;border:1px solid var(--line)}
.yn-mark{position:absolute;transform:translate(-50%,-50%);display:flex;align-items:center;justify-content:center;
  font-weight:900;border:2.5px solid;border-radius:50%;background:rgba(255,255,255,.88);
  box-shadow:0 1px 5px rgba(0,0,0,.18);pointer-events:none;line-height:1;z-index:2}
.yn-mark.approx{border-style:dashed;opacity:.75}
.yn-annotated-scroll{max-height:440px;overflow:auto;border:1px solid var(--line);border-radius:10px;padding:6px}

/* ============ 顶栏学科切换 ============ */
.subject-bar{display:flex;gap:4px;background:#f1f3f8;border-radius:12px;padding:4px;flex-wrap:wrap}
.subject-btn{border:none;background:transparent;padding:6px 12px;border-radius:9px;font-size:13px;color:var(--sub);line-height:1;height:auto;white-space:nowrap}
.subject-btn:hover{background:#e6eaf5;color:var(--ink)}
.subject-btn.active{background:#fff;color:#3b51d6;font-weight:700;box-shadow:0 1px 4px rgba(23,35,61,.12)}
@media (max-width:880px){ .subject-bar{padding:3px} .subject-btn{padding:5px 8px;font-size:12px} }

/* ============ 手机端适配（底部导航 + 大按钮） ============ */
.mobile-nav{display:none}
@media (max-width:700px){
  .sidebar{display:none !important}
  .main{width:100%}
  .topbar{height:52px;padding:0 10px}
  .crumbs{font-size:15px}
  .content{padding:10px 10px 96px}
  .mobile-nav{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:60;background:#fff;
    border-top:1px solid var(--line);padding:6px 4px calc(6px + env(safe-area-inset-bottom));
    overflow-x:auto;gap:2px;box-shadow:0 -3px 12px rgba(15,23,42,.08)}
  .mobile-nav button{flex:1 0 auto;min-width:62px;border:none;background:transparent;display:flex;
    flex-direction:column;align-items:center;gap:2px;font-size:11px;color:var(--sub);padding:6px 8px;height:auto;line-height:1.2}
  .mobile-nav button .ico{display:flex;align-items:center;justify-content:center}
  .mobile-nav button .ico svg{width:21px;height:21px}
  .mobile-nav button.active{color:#3b51d6;font-weight:700;background:#eef2ff}
  .subject-bar{max-width:100%;overflow-x:auto;flex-wrap:nowrap}
  .subject-btn{flex:0 0 auto}
  .g2,.g3,.g4{grid-template-columns:1fr !important}
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .card{padding:14px;border-radius:12px}
  .modal{max-width:100%;border-radius:14px;padding:16px;margin:0}
  .modal-mask{padding:10px 8px}
  button{padding:9px 14px;font-size:14px}
  button.sm{padding:7px 11px;font-size:13px}
  input,select,textarea{font-size:16px}  /* 防止 iPhone 聚焦时缩放 */
  table{font-size:12.5px}
  .table-wrap{max-height:none}
  .hw-card{flex-direction:column;align-items:flex-start}
  .hw-card .row{width:100%}
  .answer-cell{font-size:13px}
}

/* 顶栏用户 + 退出（手机端也可见） */
.top-user{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--sub);margin-right:10px;white-space:nowrap}
.top-user button{flex:none}
@media (max-width:700px){
  .top-user .uname{display:none}
  .top-user{margin-right:6px}
}