/* ===== 智学 AI 私教 · ChatGPT 风极简中性主题 ===== */
:root{
  --bg:#ffffff; --card:#ffffff; --ink:#0f0f0f; --ink-2:#5d5d5d; --ink-3:#8e8e8e;
  --blue:#0d0d0d; --blue-dark:#2f2f2f; --blue-deep:#0d0d0d; --blue-soft:#f4f4f4;
  --sky:#10a37f; --sky-dark:#0d8c6d;
  --danger:#dc2626; --success:#16a34a;
  --line:#e5e5e5; --line-soft:#ececec;
  --hover:#f0f0f0; --selected:#ececec;
  --sidebar:#f9f9f9;
  --shadow:0 1px 2px rgba(0,0,0,.04);
  --shadow-hover:0 4px 24px rgba(0,0,0,.08);
  --r-card:12px; --r-btn:10px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg); color:var(--ink);
  font-size:14px; line-height:1.6; -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{color:var(--ink);margin:0;font-weight:600}
a{color:var(--ink);text-decoration:none}
.hidden{display:none!important}

/* ---- 按钮 / 表单 ---- */
.btn{display:inline-flex;align-items:center;gap:6px;justify-content:center;
  padding:10px 20px;border-radius:var(--r-btn);border:1px solid transparent;
  font-size:14px;font-weight:500;cursor:pointer;font-family:inherit;
  transition:background .15s ease-out,border-color .15s ease-out,color .15s ease-out,box-shadow .15s;}
.btn:hover{box-shadow:var(--shadow-hover)}
.btn:active{transform:none}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-dark)}
.btn-sky{background:var(--sky);color:#fff}
.btn-sky:hover{background:var(--sky-dark)}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{background:var(--hover);border-color:#d4d4d4;color:var(--ink)}
.btn-danger{background:#fff;color:var(--danger);border-color:var(--line)}
.btn-danger:hover{background:#fef2f2;border-color:#f5c6c6;box-shadow:none}
.btn-block{width:100%}
.btn:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}
.btn-sm{padding:6px 12px;font-size:13px;font-weight:500}

input,textarea,select{
  width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:var(--r-btn);
  background:#fff;color:var(--ink);font-family:inherit;font-size:14px;outline:none;
  transition:border-color .15s,box-shadow .15s;}
input::placeholder,textarea::placeholder{color:var(--ink-3)}
input:focus,textarea:focus,select:focus{border-color:#0d0d0d;box-shadow:0 0 0 1px rgba(13,13,13,.12)}
textarea{resize:vertical;min-height:90px;line-height:1.7}
label{display:block;margin-bottom:14px;font-size:13px;color:var(--ink-2);font-weight:500}
label input,label textarea,label select{margin-top:6px;color:var(--ink)}

.paper-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r-card);box-shadow:var(--shadow)}

/* ---- 登录落地页 ---- */
.landing-body{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:32px 16px;
  background:#fff;}
.landing-wrap{display:flex;gap:52px;align-items:center;max-width:940px;width:100%;flex-wrap:wrap;justify-content:center}
.landing-hero{flex:1;min-width:300px}
.brand-mark{width:56px;height:56px;border-radius:14px;
  background:var(--sky);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:28px;font-weight:700;}
.landing-hero h1{font-size:40px;margin:18px 0 10px;letter-spacing:-.5px;color:var(--ink);font-weight:700}
.brand-ar{color:var(--sky)}
.landing-slogan{color:var(--ink-2);font-size:17px;margin:0 0 20px;line-height:1.6}
.landing-slogan strong{color:var(--ink);font-weight:700;border-bottom:2px solid var(--sky);padding-bottom:1px}
.tagline{color:var(--ink-2);font-size:16px;margin:0 0 22px}
.subject-strip{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}
.subject-chip{--sc:var(--ink);padding:5px 15px;border-radius:99px;font-size:13px;font-weight:500;
  border:1px solid var(--line);
  color:var(--ink-2);background:#fff;box-shadow:none}
.feature-line{list-style:none;padding:0;margin:0;color:var(--ink-2);font-size:14px;line-height:2.2}
.auth-card{width:390px;max-width:100%;padding:32px;border-radius:16px}
.captcha-row .captcha-inline{display:flex;align-items:center;gap:10px}
.captcha-inline input{flex:1;min-width:0}
.captcha-inline img{height:44px;width:120px;border-radius:8px;border:1px solid var(--line);
  cursor:pointer;background:#f5f8fd;flex:none}
.auth-tabs{display:flex;gap:8px;margin-bottom:24px;border-bottom:1px solid var(--line)}
.auth-tab{flex:1;padding:11px;background:none;border:0;font-size:15px;font-weight:500;color:var(--ink-2);
  cursor:pointer;border-bottom:2px solid transparent;font-family:inherit;margin-bottom:-1px}
.auth-tab.active{color:var(--ink);border-bottom-color:var(--ink)}
.form-hint{font-size:12px;color:var(--ink-2);text-align:center;margin:14px 0 0}
.form-hint code{background:var(--blue-soft);padding:1px 6px;border-radius:4px;font-size:12px;color:var(--ink)}
.auth-msg{color:var(--danger);font-size:13px;margin:12px 0 0;min-height:20px;text-align:center;font-weight:500}

/* ---- 主框架 ---- */
.app-layout{display:flex;min-height:100vh}
.sidebar{width:244px;background:var(--sidebar);
  color:var(--ink);display:flex;flex-direction:column;
  border-right:1px solid var(--line);
  position:sticky;top:0;height:100vh;flex-shrink:0}
.side-brand{padding:18px 16px;font-size:16px;font-weight:600;letter-spacing:-.2px;color:var(--ink);
  border-bottom:1px solid var(--line);display:flex;align-items:center;gap:10px}
.side-brand .dot{width:30px;height:30px;border-radius:8px;background:var(--sky);
  color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:16px}
.side-user{padding:13px 16px;font-size:12px;color:var(--ink-2);border-bottom:1px solid var(--line);line-height:1.7}
.side-user b{color:var(--ink);font-size:14px;font-weight:600}
.side-nav{flex:1;padding:10px 8px;overflow-y:auto}
.side-nav button{display:flex;align-items:center;gap:11px;width:100%;text-align:left;padding:10px 12px;
  background:none;border:0;color:var(--ink-2);border-radius:8px;cursor:pointer;
  font-size:14px;font-weight:500;font-family:inherit;margin-bottom:2px;transition:background .12s,color .12s}
.side-nav button:hover{background:var(--hover);color:var(--ink)}
.side-nav button.active{background:var(--selected);color:var(--ink);font-weight:600;box-shadow:none}
.side-nav .nav-ico{width:20px;text-align:center;font-size:16px}
.side-foot{padding:10px 12px;border-top:1px solid var(--line)}
.logout-btn{width:100%;background:transparent;border:1px solid var(--line);color:var(--ink-2);
  padding:9px;border-radius:8px;cursor:pointer;font-family:inherit;font-size:13px;font-weight:500;transition:.12s}
.logout-btn:hover{background:var(--hover);color:var(--ink)}

/* 手机端顶部精简栏（桌面隐藏） */
.mobile-topbar{display:none}

.main{flex:1;padding:30px 34px;min-width:0;animation:fadeUp .18s ease-out;max-width:1400px;background:#fff}
@keyframes fadeUp{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.page-head{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:24px;flex-wrap:wrap;gap:12px}
.page-head h2{font-size:24px;color:var(--ink);font-weight:700;letter-spacing:-.3px}
.page-head .sub{color:var(--ink-2);font-size:13px;margin-top:6px}

/* ---- 统计卡 / 表格 / 列表 ---- */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:14px;margin-bottom:22px}
.stat-card{padding:20px 22px}
.stat-card .num{font-size:30px;font-weight:700;color:var(--ink);line-height:1.2;font-variant-numeric:tabular-nums}
.stat-card .lbl{color:var(--ink-2);font-size:13px;margin-top:4px}
.stat-card.sky .num{color:var(--sky)}
.stat-card.cost{background:#f2faf7;border-color:rgba(16,163,127,.35)}
.stat-card.cost .num{color:var(--sky)}

.panel{padding:22px;margin-bottom:20px}
.panel h3{font-size:15px;margin-bottom:16px;display:flex;align-items:center;gap:8px;color:var(--ink);font-weight:600}
.panel h3::before{content:"";width:3px;height:15px;background:var(--ink);border-radius:2px}

.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
table.tbl{width:100%;border-collapse:collapse;font-size:13px;min-width:520px}
.tbl th{text-align:left;color:var(--ink-2);font-weight:500;padding:11px 12px;border-bottom:1px solid var(--line);
  font-size:12px;white-space:nowrap;text-transform:none}
.tbl td{padding:12px;border-bottom:1px solid var(--line-soft);vertical-align:middle}
.tbl tr:hover td{background:#fafafa}
.tbl .actions{white-space:nowrap;text-align:right}

.badge{display:inline-block;padding:2px 10px;border-radius:99px;font-size:12px;font-weight:500}
.badge-subj{color:var(--sc,var(--ink));background:color-mix(in srgb,var(--sc,var(--ink)) 8%,#fff);
  border:1px solid color-mix(in srgb,var(--sc,var(--ink)) 22%,var(--line))}
.badge-gold{color:var(--sky-dark);background:#ecfdf5;border:1px solid #bbf7d0}
.badge-gray{color:var(--ink-2);background:var(--blue-soft);border:1px solid var(--line)}
.badge-hr{color:#fff;background:var(--ink);border:1px solid var(--ink);font-weight:600;vertical-align:middle}
.ts-subj-sel{padding:8px 10px;border:1px solid var(--line,#e5e5e5);border-radius:10px;background:#fff;font-size:14px;color:var(--ink,#0f0f0f);cursor:pointer;min-width:160px}
.ts-subj-sel:focus{outline:none;border-color:var(--ink,#0d0d0d)}
.check-line{display:flex;align-items:flex-start;gap:8px;margin:10px 0;padding:10px 12px;font-size:13px;color:var(--ink-2);
  background:var(--blue-soft);border:1px solid var(--line);border-radius:10px;cursor:pointer;line-height:1.5}
.check-line input{margin-top:2px;width:16px;height:16px;accent-color:var(--ink);flex:0 0 auto;cursor:pointer}

.code-box{font-family:ui-monospace,Menlo,monospace;letter-spacing:3px;font-weight:700;color:var(--ink);
  background:var(--blue-soft);padding:2px 10px;border-radius:6px;border:1px solid var(--line)}

/* ---- 学科卡片 ---- */
.subject-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px}
.book-card{position:relative;padding:24px 22px 20px 28px;cursor:pointer;overflow:hidden;text-align:left;
  transition:background .15s,border-color .15s,box-shadow .15s;
  border:1px solid var(--line);background:var(--card);border-radius:var(--r-card);box-shadow:none;
  font-family:inherit}
.book-card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--sc)}
.book-card::after{content:"";position:absolute;right:-30px;top:-30px;width:90px;height:90px;border-radius:50%;
  background:color-mix(in srgb,var(--sc) 6%,transparent)}
.book-card:hover{box-shadow:var(--shadow-hover);border-color:#d4d4d4;background:#fcfcfc}
.book-card .bk-name{font-size:21px;font-weight:700;color:var(--sc)}
.book-card .bk-desc{color:var(--ink-2);font-size:13px;margin-top:8px;position:relative}
.book-card .bk-go{margin-top:18px;color:var(--ink-2);font-size:13px;font-weight:600;position:relative}

/* ---- 聊天（ChatGPT 式） ---- */
.chat-layout{display:flex;gap:0;height:calc(100vh - 120px);min-height:520px}
.chat-list{width:268px;flex-shrink:0;padding:12px;overflow-y:auto;background:var(--sidebar);
  border:1px solid var(--line);border-radius:var(--r-card);margin-right:16px}
.chat-list .cl-head{display:flex;gap:8px;align-items:center;margin-bottom:12px}
.chat-list .cl-title{font-weight:600;font-size:15px;flex:1;color:var(--ink)}
.conv-item{padding:10px 12px;border-radius:8px;cursor:pointer;border:1px solid transparent;margin-bottom:2px}
.conv-item:hover{background:var(--hover)}
.conv-item.active{background:var(--selected);border-color:transparent}
.conv-item .ci-title{font-size:13px;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--ink)}
.conv-item .ci-meta{font-size:11px;color:var(--ink-2);margin-top:3px;display:flex;gap:6px;align-items:center}
.chat-main{flex:1;display:flex;flex-direction:column;min-width:0;padding:0;overflow:hidden;
  border:1px solid var(--line);border-radius:var(--r-card);background:#fff}
.chat-top{padding:14px 20px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:10px}
.chat-top .ct-title{font-weight:600;font-size:16px;flex:1;color:var(--ink)}
.chat-body{flex:1;overflow-y:auto;padding:24px 20px;display:flex;flex-direction:column;gap:18px;
  background:#fff}
.msg{display:flex;gap:12px;max-width:82%;animation:fadeUp .18s ease-out}
.msg.user{align-self:flex-end;flex-direction:row-reverse}
.msg .avatar{width:30px;height:30px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;
  justify-content:center;font-size:13px;font-weight:600;background:var(--blue-soft);color:var(--ink);
  border:1px solid var(--line)}
.msg.assistant .avatar{background:var(--sky);color:#fff;border-color:transparent}
.msg.user .avatar{background:var(--blue-soft);color:var(--ink)}
.bubble{padding:10px 16px;border-radius:18px;font-size:14px;line-height:1.75;white-space:pre-wrap;word-break:break-word}
.msg.assistant .bubble{background:transparent;border:0;border-radius:4px;padding:4px 2px;box-shadow:none;color:var(--ink)}
.msg.user .bubble{background:var(--blue-soft);color:var(--ink);border:1px solid var(--line-soft);border-top-right-radius:6px}
.bubble img.chat-img{max-width:220px;border-radius:10px;display:block;margin-bottom:8px;border:1px solid var(--line)}
.typing-cursor{display:inline-block;width:8px;height:16px;background:var(--ink);margin-left:2px;
  vertical-align:-2px;animation:blink 1s steps(1) infinite;border-radius:1px}
@keyframes blink{50%{opacity:0}}
.thinking{color:var(--ink-2);font-size:13px;display:inline-flex;align-items:center;gap:6px}
.thinking i{width:6px;height:6px;border-radius:50%;background:var(--ink-3);display:inline-block;animation:dot 1.2s infinite}
.thinking i:nth-child(2){animation-delay:.2s}.thinking i:nth-child(3){animation-delay:.4s}
@keyframes dot{0%,60%,100%{transform:translateY(0);opacity:.4}30%{transform:translateY(-4px);opacity:1}}
.chat-input{border-top:1px solid var(--line);padding:14px 16px;background:#fff}
.chat-input .ci-row{display:flex;gap:10px;align-items:flex-end;
  border:1px solid var(--line);border-radius:24px;padding:8px 8px 8px 14px;background:#fff;
  transition:border-color .15s,box-shadow .15s}
.chat-input .ci-row:focus-within{border-color:#0d0d0d;box-shadow:0 0 0 1px rgba(13,13,13,.1)}
.chat-input textarea{flex:1;min-height:38px;max-height:140px;border:0;padding:6px 0;background:transparent;box-shadow:none}
.chat-input textarea:focus{border:0;box-shadow:none}
.ci-tools{display:flex;gap:6px;align-items:center}
.icon-btn{width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:#fff;
  cursor:pointer;font-size:16px;display:flex;align-items:center;justify-content:center;flex-shrink:0;
  color:var(--ink-2);transition:.12s}
.icon-btn:hover{background:var(--hover);border-color:#d4d4d4;color:var(--ink)}
.icon-btn.cam{border-color:var(--line)}
.icon-btn.send{background:var(--blue);color:#fff;border-color:var(--blue);width:38px;height:38px;border-radius:50%;font-size:16px}
.icon-btn.send:hover{background:var(--blue-dark);color:#fff}
.icon-btn:disabled{background:var(--blue-soft);color:var(--ink-3);border-color:var(--line);cursor:not-allowed}
.img-preview{position:relative;display:inline-block;margin:0 0 8px 2px}
.img-preview img{height:64px;border-radius:8px;border:1px solid var(--line)}
.img-preview .rm{position:absolute;top:-8px;right:-8px;width:20px;height:20px;border-radius:50%;background:var(--danger);
  color:#fff;border:0;cursor:pointer;font-size:12px;line-height:1}
/* 聊天上传图片后：缩略图旁的复制链接操作区 */
.img-actions{display:inline-flex;align-items:center;gap:8px;margin:0 0 8px 8px;flex-wrap:wrap}

.empty{text-align:center;padding:60px 20px;color:var(--ink-2)}
.empty .em-ico{font-size:46px;margin-bottom:12px;opacity:.7}
.empty h4{margin-bottom:6px;color:var(--ink);font-weight:600}

/* ---- 柱状图 ---- */
.bar-chart{display:flex;align-items:flex-end;gap:10px;height:170px;padding-top:10px}
.bar-col{flex:1;display:flex;flex-direction:column;align-items:center;gap:6px;height:100%;justify-content:flex-end;min-width:18px}
.bar{width:100%;max-width:34px;background:#d4d4d4;border-radius:6px 6px 0 0;min-height:2px;
  transition:height .4s ease-out}
.bar-col.today .bar{background:var(--ink)}
.bar-col .bar-val{font-size:11px;color:var(--ink-2);font-weight:500}
.bar-col .bar-day{font-size:11px;color:var(--ink-2);white-space:nowrap}

/* ---- 模态框 ---- */
.modal-mask{position:fixed;inset:0;background:rgba(0,0,0,.4);display:flex;align-items:center;
  justify-content:center;z-index:50;padding:20px;animation:fadeUp .15s ease-out}
.modal{background:var(--card);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow-hover);width:520px;
  max-width:100%;max-height:88vh;overflow-y:auto;padding:26px}
.modal h3{font-size:18px;margin-bottom:18px;color:var(--ink);font-weight:600}
.modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:20px}
.modal .cw-content{white-space:pre-wrap;line-height:1.8}
/* 课件正文里的外部 PPT 直链 */
.cw-link{color:var(--sky);text-decoration:underline;word-break:break-all;
  text-underline-offset:2px;cursor:pointer}
.cw-link:hover{color:#0b7a5e}


/* AI 课件助手（课件编辑器内） */
.ai-box{background:#fafafa;border:1px solid var(--line);
  border-radius:12px;padding:16px;margin-bottom:18px}
.ai-box h4{font-size:15px;color:var(--ink);margin-bottom:4px;display:flex;align-items:center;gap:6px;font-weight:600}
.ai-box-head{font-size:15px;font-weight:600;color:var(--ink);margin-bottom:12px;display:flex;align-items:center;gap:6px}
.ai-box .ai-hint{font-size:12.5px;color:var(--ink-2);margin-bottom:12px}
.ai-box .row-flex{margin-bottom:10px}
.ai-box textarea,.ai-box input{background:#fff}
.ai-status{font-size:13px;color:var(--ink-2);margin-top:10px;min-height:18px}

/* 课件参考图（拍照/相册上传给 AI 看图做课件） */
.cw-img-zone{margin:4px 0 12px;padding:12px;border:1px dashed var(--line);border-radius:10px;background:#fff}
.cw-img-tools{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.cw-img-tools .btn{padding:7px 14px;font-size:13px}
.cw-img-preview{display:flex;align-items:center;gap:14px;margin-top:12px;padding-top:12px;border-top:1px solid var(--line)}
.cw-img-preview img{width:84px;height:84px;object-fit:cover;border-radius:10px;border:1px solid var(--line);background:#f4f4f4;flex:0 0 auto}
.cw-img-meta{display:flex;flex-direction:column;align-items:flex-start;gap:8px;min-width:0}
.cw-img-meta .cw-link{font-size:13px}
.cw-img-del{border:1px solid var(--line);background:#fff;color:var(--danger);border-radius:8px;
  padding:5px 12px;font-size:12.5px;cursor:pointer;font-family:inherit;transition:.12s}
.cw-img-del:hover{background:#fdecec;border-color:var(--danger)}

/* 学情分析报告弹窗正文 */
.report-body{background:#fafafa;border:1px solid var(--line);border-radius:10px;
  padding:16px;max-height:52vh;overflow-y:auto;white-space:pre-wrap;line-height:1.85;
  font-size:14px;color:var(--ink);overflow-wrap:break-word}
.report-body:empty::before{content:"";}

/* 学生：AI 组卷页 */
/* 用量统计工具栏 + 分段筛选 */
.usage-toolbar{margin-bottom:16px;gap:12px}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:10px;padding:3px;background:#fff}
.seg-btn{border:0;background:transparent;padding:6px 16px;border-radius:8px;cursor:pointer;
  font-family:inherit;font-size:13px;font-weight:500;color:var(--ink-2);transition:.12s}
.seg-btn:hover{background:var(--hover);color:var(--ink)}
.seg-btn.active{background:var(--ink);color:#fff}

.subj-pick-row{display:flex;flex-wrap:wrap;gap:10px}
.subj-pick{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:99px;
  border:1px solid var(--line);background:#fff;color:var(--ink);font-size:14px;font-weight:500;
  cursor:pointer;font-family:inherit;transition:.15s}
.subj-pick:hover{background:var(--hover)}
.subj-pick.active{background:var(--ink);color:#fff;border-color:var(--ink)}
.subj-pick .sp-dot{width:9px;height:9px;border-radius:50%;flex-shrink:0}
.subj-pick.active .sp-dot{background:#fff!important}
.ai-tool-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.ai-tool-card{text-align:left;padding:20px;border:1px solid var(--line);border-radius:12px;background:#fff;
  cursor:pointer;font-family:inherit;transition:.15s}
.ai-tool-card:hover:not(:disabled){border-color:#d4d4d4;box-shadow:var(--shadow-hover);background:#fcfcfc}
.ai-tool-card:disabled{opacity:.45;cursor:not-allowed}
.ai-tool-card .at-ico{font-size:28px;margin-bottom:10px}
.ai-tool-card .at-name{font-size:16px;font-weight:600;color:var(--ink);margin-bottom:6px}
.ai-tool-card .at-desc{font-size:13px;color:var(--ink-2);line-height:1.7}
@media (max-width:760px){ .ai-tool-grid{grid-template-columns:1fr} }

/* 学情分析：会话数量选择 */
.rep-range-row{margin:16px 0 6px}
.rep-range-val{text-align:center;font-size:14px;color:var(--ink-2);margin-top:8px}
.rep-range-val b{color:var(--ink);font-size:17px;font-weight:700}
input[type="range"]{-webkit-appearance:none;appearance:none;width:100%;height:4px;border-radius:99px;
  background:var(--line);outline:none;padding:0;border:0;cursor:pointer}
input[type="range"]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:20px;height:20px;
  border-radius:50%;background:var(--ink);border:2px solid #fff;box-shadow:0 1px 4px rgba(0,0,0,.25);cursor:pointer}
input[type="range"]::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:var(--ink);
  border:2px solid #fff;box-shadow:0 1px 4px rgba(0,0,0,.25);cursor:pointer}

/* ---- 相机 ---- */
.ar-modal{width:680px}
.camera-stage{position:relative;width:100%;aspect-ratio:4/3;background:#0f0f0f;border-radius:12px;overflow:hidden}
.camera-stage video{width:100%;height:100%;object-fit:cover}
.camera-stage canvas{display:none}
.ar-frame{position:absolute;inset:0;pointer-events:none}
.ar-frame i{position:absolute;width:34px;height:34px;border:3px solid var(--sky)}
.ar-frame i:nth-child(1){left:7%;top:9%;border-right:0;border-bottom:0;border-radius:6px 0 0 0}
.ar-frame i:nth-child(2){right:7%;top:9%;border-left:0;border-bottom:0;border-radius:0 6px 0 0}
.ar-frame i:nth-child(3){left:7%;bottom:9%;border-right:0;border-top:0;border-radius:0 0 0 6px}
.ar-frame i:nth-child(4){right:7%;bottom:9%;border-left:0;border-top:0;border-radius:0 0 6px 0}
.ar-hint{position:absolute;left:0;right:0;bottom:14px;text-align:center;color:#f1f1f1;font-size:13px;
  text-shadow:0 1px 4px rgba(0,0,0,.6)}
.shutter{width:66px;height:66px;border-radius:50%;border:4px solid #fff;background:var(--sky);
  cursor:pointer;margin:16px auto 4px;display:block;box-shadow:0 0 0 4px rgba(16,163,127,.3)}
.shutter:active{transform:scale(.92)}
.camera-stage img.shot{width:100%;height:100%;object-fit:contain;background:#000}

/* ---- 课件 ---- */
.cw-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:14px}
.cw-card{padding:20px;cursor:pointer;transition:border-color .15s,box-shadow .15s,background .15s;position:relative}
.cw-card:hover{box-shadow:var(--shadow-hover);border-color:#d4d4d4;background:#fcfcfc}
.cw-card h4{font-size:15px;margin-bottom:8px;line-height:1.5;font-weight:600}
.cw-card .cw-meta{font-size:12px;color:var(--ink-2);display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.cw-card .cw-preview{color:var(--ink-2);font-size:13px;margin-top:10px;display:-webkit-box;
  -webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.cw-dl{position:absolute;top:14px;right:14px;display:inline-flex;align-items:center;gap:3px;
  border:1px solid var(--line);background:#fff;color:var(--ink-2);border-radius:8px;
  font-size:12px;padding:4px 9px;cursor:pointer;transition:all .15s}
.cw-dl span{font-weight:700;letter-spacing:.5px}
.cw-dl:hover{border-color:var(--sky);color:var(--sky);background:#f2faf7}
.cw-dl:disabled{opacity:.6;cursor:default}

/* ---- 学习打卡 ---- */
.ck-hero{text-align:center;padding:30px 20px 26px;background:#fff;border:1px solid var(--line);
  border-radius:14px;margin-bottom:14px}
.ck-hero.done{background:#f2faf7;border-color:rgba(16,163,127,.35)}
.ck-flame{font-size:34px;line-height:1}
.ck-streak-num{font-size:52px;font-weight:800;color:var(--sky);line-height:1.1;margin-top:4px;
  font-variant-numeric:tabular-nums}
.ck-streak-lbl{color:var(--ink-2);font-size:14px;margin-top:2px}
.ck-encour{color:var(--ink-2);font-size:13px;margin-top:12px}
.ck-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.ck-item{text-align:center;padding:16px 8px;border:1px solid var(--line);border-radius:12px;background:#fafafa}
.ck-ico{font-size:22px}
.ck-val{font-size:28px;font-weight:700;color:var(--ink);line-height:1.2;margin:4px 0;font-variant-numeric:tabular-nums}
.ck-lbl{color:var(--ink-2);font-size:12px}
.ck-week{display:grid;grid-template-columns:repeat(7,1fr);gap:8px}
.ck-day{display:flex;flex-direction:column;align-items:center;gap:6px;padding:12px 4px;border-radius:12px;
  border:1px solid var(--line);background:#fff;color:var(--ink-3)}
.ck-day .ck-wd{font-size:12px}
.ck-day .ck-dot{width:26px;height:26px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-size:13px;background:#f0f0f0;color:transparent}
.ck-day .ck-cnt{font-size:11px;color:var(--ink-3);min-height:14px}
.ck-day.on{background:#f2faf7;border-color:rgba(16,163,127,.35)}
.ck-day.on .ck-dot{background:var(--sky);color:#fff}
.ck-day.on .ck-wd{color:var(--ink);font-weight:600}
.ck-day.on .ck-cnt{color:var(--sky)}
.ck-day.today{outline:2px solid rgba(16,163,127,.25);outline-offset:0}
@media (max-width:760px){
  .ck-streak-num{font-size:44px}
  .ck-val{font-size:24px}
}

/* ---- 设置表单 ---- */
.settings-form{max-width:700px}
.settings-form .field-row{display:grid;grid-template-columns:180px 1fr;gap:14px;align-items:center;margin-bottom:14px}
.settings-form .field-row label{margin:0;font-weight:500;color:var(--ink)}
.settings-form .field-desc{grid-column:2;font-size:12px;color:var(--ink-2);margin:-8px 0 14px}
.token-masked{letter-spacing:2px}
.bot-field-wrap{display:flex;flex-direction:column;gap:4px;min-width:0}
.bot-resolve{font-size:12px;line-height:1.3;word-break:break-all}
.bot-resolve.bot-own{color:var(--success)}
.bot-resolve.bot-fallback{color:var(--ink-2)}
.bot-resolve.bot-none{color:var(--danger)}
.bot-k{font-size:12px;color:var(--ink-2);margin-top:6px}
.bot-k:first-child{margin-top:0}
.bot-k b{color:var(--ink-1)}
.bot-k-img b{color:var(--primary)}

/* ---- 数据清理页 ---- */
.switch-lbl{display:flex;align-items:center;gap:8px;font-weight:400;color:var(--ink);cursor:pointer}
.switch-lbl input{width:16px;height:16px;accent-color:var(--blue);cursor:pointer}
.ck-select{width:100%;padding:9px 12px;border:1px solid var(--line);border-radius:var(--r-btn);background:#fff;
  font-size:14px;color:var(--ink);font-family:inherit}
.ck-select:focus{outline:none;border-color:var(--ink-3)}
.ck-cron-url{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:12px;color:var(--ink-2);background:#f7f7f7}
.settings-form code{background:#f4f4f4;padding:2px 6px;border-radius:6px;font-size:12px;word-break:break-all}

/* ---- 已安装插件（AI 智能体）选择 / 管理 ---- */
.plugin-wrap{display:inline-flex;align-items:center;gap:6px}
.plugin-ico{font-size:14px}
.plugin-sel{width:auto;min-width:150px;padding:7px 10px;font-size:13px;border-radius:8px}
.plugin-sel:disabled{background:#f4f4f4;color:var(--ink-3);cursor:not-allowed}
.chat-top .plugin-wrap{flex-shrink:0}
.plugin-field{display:block}
.plugin-inline{display:block;margin-top:6px}
.plugin-inline .plugin-sel{width:100%}
.plugin-row{display:grid;grid-template-columns:1fr 1.4fr auto;gap:10px;align-items:center;margin-bottom:10px}
.plugin-row input{margin:0}
#paperPluginBox .plugin-sel{width:100%;max-width:420px}
@media (max-width:760px){
  .plugin-row{grid-template-columns:1fr;gap:6px}
  .chat-top{flex-wrap:wrap;gap:8px}
  .chat-top .plugin-wrap{order:3;width:100%}
  .chat-top .plugin-wrap .plugin-sel{flex:1;width:100%}
}

.toast{position:fixed;top:22px;left:50%;transform:translateX(-50%);background:var(--ink);color:#fff;
  padding:12px 24px;border-radius:10px;font-size:14px;font-weight:500;z-index:99;box-shadow:var(--shadow-hover);
  animation:fadeUp .2s ease-out;max-width:90vw}
.toast.err{background:var(--danger)}

.muted{color:var(--ink-2);font-size:13px}
.row-flex{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.mt16{margin-top:16px}
.back-link{color:var(--ink-2);cursor:pointer;font-size:13px;font-weight:600;background:none;border:0;padding:0;font-family:inherit}
.back-link:hover{color:var(--ink)}

/* ---- 响应式：平板 ---- */
@media (max-width:1024px){
  .main{padding:22px 18px 28px}
  .chat-layout{height:calc(100vh - 96px)}
  .sidebar{width:208px;padding:18px 12px}
  .side-nav button{padding:9px 10px;font-size:13px}
  .settings-form .field-row{grid-template-columns:150px 1fr;gap:12px}
}

/* ---- 响应式：手机 ---- */
.mobile-tabbar{display:none}
@media (max-width:760px){
  /* 顶部精简栏：品牌 + 退出 */
  .mobile-topbar{
    display:flex;align-items:center;justify-content:space-between;
    position:fixed;top:0;left:0;right:0;z-index:50;
    padding:calc(7px + env(safe-area-inset-top,0px)) 14px 7px;
    background:var(--sidebar);border-bottom:1px solid var(--line)}
  .mobile-topbar .mt-brand{display:flex;align-items:center;gap:8px;font-size:15px;font-weight:600;color:var(--ink)}
  .mobile-topbar .mt-dot{width:26px;height:26px;border-radius:7px;background:var(--sky);color:#fff;
    display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px}
  .mobile-topbar .mt-logout{width:auto;padding:7px 14px;font-size:12px;border-radius:8px;
    background:#fff;border:1px solid var(--line);color:var(--ink-2)}
  .app-layout{flex-direction:column}
  .sidebar{
    position:fixed;left:0;right:0;bottom:0;top:auto;width:100%;height:auto;z-index:40;
    flex-direction:row;align-items:stretch;border-radius:16px 16px 0 0;
    padding:6px 4px calc(8px + env(safe-area-inset-bottom,0px));
    border-right:0;border-top:1px solid var(--line);
    box-shadow:0 -4px 20px rgba(0,0,0,.08);background:var(--sidebar)}
  .side-brand{display:none}
  .side-user{display:none}
  .side-foot{display:none}
  /* 底部 Tab 栏：导航项等宽均分，不横滑、不挤退出 */
  .side-nav{display:flex;flex:1;overflow-x:hidden;overflow-y:hidden;padding:0;gap:2px}
  .side-nav button{flex:1 1 0;min-width:0;flex-direction:column;gap:3px;padding:6px 2px;margin:0;font-size:10px;
    justify-content:center;height:auto;min-height:52px;border-radius:10px;
    flex-shrink:1;color:var(--ink-2);line-height:1.2;white-space:nowrap;
    overflow:hidden;text-overflow:ellipsis}
  .side-nav button.active{background:var(--selected);color:var(--ink)}
  .side-nav .nav-ico{font-size:19px;width:auto}
  /* 内容区：上留顶栏、下留底栏 */
  .main{padding:calc(64px + env(safe-area-inset-top,0px)) 12px calc(80px + env(safe-area-inset-bottom,0px));max-width:100%}
  .page-head{margin-bottom:16px;gap:8px}
  .page-head h2{font-size:19px}
  .page-head .sub{font-size:12px}
  .panel{padding:16px 14px;margin-bottom:16px}
  .panel h3{font-size:14px;margin-bottom:12px}
  /* iOS 聚焦不缩放：输入控件手机端 16px */
  input,textarea,select{font-size:16px}
  .chat-input textarea{font-size:16px}
  /* 按钮触控 */
  .btn{padding:12px 18px}
  .btn-sm{padding:8px 12px}
  .stat-grid{grid-template-columns:repeat(2,1fr);gap:10px}
  .stat-card{padding:14px}
  .stat-card .num{font-size:24px}
  .subject-grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .book-card{padding:18px 14px 16px 18px}
  .book-card .bk-name{font-size:17px}
  .cw-grid{grid-template-columns:1fr}
  /* 设置表单：单列 */
  .settings-form{max-width:100%}
  .settings-form .field-row{grid-template-columns:1fr;gap:6px;margin-bottom:16px}
  .settings-form .field-desc{grid-column:1;margin:-4px 0 12px}
  /* 柱状图：手机可横滑，避免 14 根柱挤成一团 */
  .bar-chart{overflow-x:auto;-webkit-overflow-scrolling:touch;padding-bottom:6px}
  .bar-col{min-width:26px;gap:4px}
  /* 打卡 / 概况统计格：手机两列，覆盖内联 3~4 列 */
  .ck-grid{grid-template-columns:repeat(2,1fr)!important}
  /* 打卡周历：收紧 */
  .ck-week{gap:4px}
  .ck-week > *{min-width:0}
  /* 聊天：上下堆叠 */
  .chat-layout{flex-direction:column;height:auto;min-height:0}  .chat-list{width:100%;max-height:168px;flex-shrink:0;margin-right:0;margin-bottom:12px}
  .chat-main{min-height:70vh}
  .chat-top{padding:12px 14px}
  .chat-body{min-height:320px;padding:16px 12px;gap:14px}
  .msg{max-width:94%;gap:9px}
  .bubble img.chat-img{max-width:150px}
  .chat-input{padding:10px 12px calc(10px + env(safe-area-inset-bottom,0px))}
  .chat-input .ci-row{flex-wrap:nowrap;gap:8px}
  .chat-input .icon-btn{width:42px;height:42px;flex-shrink:0}
  /* 模态框：底部吸附，接近全屏 */
  .modal-mask{padding:0;align-items:flex-end}
  .modal{width:100%;max-width:100%;max-height:92vh;border-radius:16px 16px 0 0;
    padding:20px 16px calc(20px + env(safe-area-inset-bottom,0px));overflow-y:auto;
    -webkit-overflow-scrolling:touch}
  .ar-modal{width:100%}
  /* 登录落地页 */
  .landing-body{padding:20px 14px;align-items:flex-start}
  .landing-wrap{gap:28px}
  .landing-hero{min-width:0;text-align:center}
  .landing-hero h1{font-size:30px;margin:14px 0 8px}
  .landing-slogan{font-size:15px}
  .tagline{font-size:14px}
  .subject-strip{justify-content:center}
  .feature-line{line-height:2}
  .auth-card{padding:24px 20px}
}

/* ---- 响应式：超小屏手机（≤380px）---- */
@media (max-width:380px){
  .side-nav button{min-width:0;font-size:9px;padding:6px 1px;gap:2px}
  .side-nav .nav-ico{font-size:17px}
  .mobile-topbar{padding-left:11px;padding-right:11px}
  .stat-grid{grid-template-columns:1fr}
  .subject-grid{grid-template-columns:1fr}
  .main{padding:calc(60px + env(safe-area-inset-top,0px)) 10px calc(78px + env(safe-area-inset-bottom,0px))}
  .landing-hero h1{font-size:26px}
  .modal{padding:18px 14px calc(18px + env(safe-area-inset-bottom,0px))}
}

/* ---- 列表分页条 ---- */
.pager-wrap{padding:12px 2px 4px;display:flex;justify-content:flex-end}
.pager-wrap:empty{display:none}
.pager{display:inline-flex;align-items:center;gap:8px;flex-wrap:wrap}
.pg-info{font-size:13px;color:var(--muted,#888);margin-right:6px;white-space:nowrap}
.pg-btn{display:inline-flex;align-items:center;justify-content:center;min-width:34px;height:32px;
  padding:0 12px;font-size:13px;border:1px solid var(--line,#e5e5e5);border-radius:8px;
  background:#fff;color:var(--ink,#1a1a1a);cursor:pointer;transition:all .15s}
.pg-btn:hover:not(:disabled){background:var(--hover,#f7f7f6);border-color:#d4d4d4}
.pg-btn:disabled{opacity:.4;cursor:not-allowed}
@media (max-width:760px){
  .pager-wrap{justify-content:center}
}