/* ============ 小初学习智能体 · Apple WWDC 风格 ============ */
:root{
  --bg:#f5f5f7; --card:#ffffff; --txt:#1d1d1f; --sub:#86868b; --line:#e8e8ed;
  --blue:#0071e3; --blue-deep:#0058b8; --blue-bg:#eaf3ff;
  --green:#34c759; --green-bg:#e9f9ee; --red:#ff3b30; --red-bg:#ffeceb;
  --orange:#ff9500; --orange-bg:#fff4e5; --purple:#7c5cff; --purple-bg:#f0ecff;
  --radius:20px; --radius-s:12px; --shadow:0 4px 24px rgba(0,0,0,.06);
  --shadow-lift:0 10px 40px rgba(0,0,0,.12);
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro SC","PingFang SC","Helvetica Neue","Microsoft YaHei",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{-webkit-text-size-adjust:100%}
body{font-family:var(--font);background:var(--bg);color:var(--txt);font-size:15px;line-height:1.6;min-height:100vh}
a{color:var(--blue);text-decoration:none}
button{font-family:var(--font);cursor:pointer;border:none;background:none;color:inherit}
input,select,textarea{font-family:var(--font);font-size:15px;color:var(--txt)}
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-thumb{background:#d1d1d6;border-radius:4px}
::-webkit-scrollbar-track{background:transparent}

/* ---------- 布局 ---------- */
#app{display:flex;min-height:100vh}
#sidebar{width:248px;background:rgba(255,255,255,.88);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border-right:1px solid var(--line);display:flex;flex-direction:column;position:sticky;top:0;height:100vh;z-index:50}
.brand{display:flex;align-items:center;gap:12px;padding:24px 22px 18px}
.brand-logo{width:44px;height:44px;border-radius:12px;background:linear-gradient(135deg,#0071e3,#7c5cff);
  display:flex;align-items:center;justify-content:center;font-size:22px;box-shadow:0 6px 16px rgba(0,113,227,.3)}
.brand-name{font-size:17px;font-weight:700;letter-spacing:-.2px}
.brand-name small{display:block;font-size:11px;color:var(--sub);font-weight:400;margin-top:2px}
#side-nav{flex:1;padding:6px 14px;display:flex;flex-direction:column;gap:4px;overflow-y:auto}
.nav-item{display:flex;align-items:center;gap:12px;padding:11px 14px;border-radius:12px;color:#424245;
  font-size:14.5px;font-weight:500;transition:all .18s}
.nav-item .nav-ico{font-size:19px;width:24px;text-align:center;filter:grayscale(35%)}
.nav-item:hover{background:rgba(0,0,0,.045)}
.nav-item.active{background:var(--blue-bg);color:var(--blue-deep);font-weight:600}
.nav-item.active .nav-ico{filter:none;transform:scale(1.08)}
.side-foot{padding:16px;border-top:1px solid var(--line)}
.side-tip{font-size:11px;color:var(--sub);text-align:center;margin-top:10px;line-height:1.5}

#main{flex:1;min-width:0;display:flex;flex-direction:column}
#topbar{display:flex;align-items:center;gap:14px;padding:18px 34px;position:sticky;top:0;z-index:40;
  background:rgba(245,245,247,.8);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px)}
#page-title{font-size:26px;font-weight:700;letter-spacing:-.5px;flex:1}
#btn-menu{display:none}
.topbar-right{display:flex;align-items:center;gap:10px}
.student-chip{display:flex;align-items:center;gap:10px;background:var(--card);border:1px solid var(--line);
  border-radius:999px;padding:6px 14px 6px 6px;box-shadow:var(--shadow);transition:transform .15s}
.student-chip:hover{transform:translateY(-1px)}
.avatar{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,#0071e3,#7c5cff);
  color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:15px;flex-shrink:0}
.chip-info{text-align:left;line-height:1.25}
.chip-info b{display:block;font-size:14px}
.chip-info small{color:var(--sub);font-size:11px}
.chip-caret{color:var(--sub);font-size:11px}
.cloud-chip{display:inline-flex;align-items:center;gap:6px;background:var(--card);border:1px solid var(--line);
  border-radius:999px;padding:7px 14px;font-size:12.5px;font-weight:600;box-shadow:var(--shadow);transition:transform .15s}
.cloud-chip:hover{transform:translateY(-1px)}
.cloud-chip .cc-ico{font-size:14px}
.auth-tabs{display:flex;gap:6px;background:#ececf0;padding:4px;border-radius:13px;width:fit-content;margin-bottom:18px}
.auth-tab{padding:8px 22px;border-radius:10px;font-size:14px;font-weight:600;color:var(--sub);transition:all .18s}
.auth-tab.active{background:#fff;color:var(--txt);box-shadow:0 2px 8px rgba(0,0,0,.1)}
.sync-ok-tip{display:flex;align-items:center;gap:10px;background:var(--green-bg);border-radius:14px;padding:14px 16px;font-size:14px}
.sync-ok-tip .avatar{background:linear-gradient(135deg,#34c759,#00b894)}
@media (max-width:960px){ .cloud-chip .cc-txt{display:none} .cloud-chip{padding:7px 10px} }
#view-root{padding:10px 34px 60px;max-width:1180px;width:100%;margin:0 auto;flex:1}
.loading-block{padding:80px 0;text-align:center;color:var(--sub);font-size:16px}

/* ---------- 通用组件 ---------- */
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px;margin-bottom:20px}
.card-h{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px;flex-wrap:wrap}
.card-h h3{font-size:17px;font-weight:700;letter-spacing:-.2px;display:flex;align-items:center;gap:8px}
.card-sub{color:var(--sub);font-size:13px;margin-bottom:14px}
.hint{font-size:12.5px;color:var(--sub);line-height:1.55}
.grid{display:grid;gap:16px}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.grid-4{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;border-radius:12px;font-weight:600;
  font-size:14.5px;padding:10px 20px;transition:all .18s;white-space:nowrap;border:1.5px solid transparent}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 4px 14px rgba(0,113,227,.35)}
.btn-primary:hover{background:var(--blue-deep)}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--txt)}
.btn-ghost:hover{border-color:#c7c7cc;background:#fafafa}
.btn-danger{background:var(--red-bg);color:var(--red)}
.btn-danger:hover{background:#ffd9d6}
.btn-green{background:var(--green-bg);color:#1e9e4a}
.btn-green:hover{background:#d5f3de}
.btn-purple{background:var(--purple-bg);color:var(--purple)}
.btn-sm{padding:6px 13px;font-size:13px;border-radius:9px}
.btn-lg{padding:14px 30px;font-size:16.5px;border-radius:14px}
.btn-block{width:100%}
.btn[disabled]{opacity:.45;pointer-events:none}
.icon-btn{width:38px;height:38px;border-radius:50%;background:#fff;border:1px solid var(--line);
  display:inline-flex;align-items:center;justify-content:center;font-size:17px;transition:all .15s}
.icon-btn:hover{background:#f2f2f4}

/* 分段控件 */
.segmented{display:inline-flex;background:#ececf0;border-radius:11px;padding:3px;gap:2px;flex-wrap:wrap}
.seg-btn{padding:7px 18px;border-radius:9px;font-size:14px;font-weight:500;color:var(--sub);transition:all .18s}
.seg-btn.active{background:#fff;color:var(--txt);font-weight:600;box-shadow:0 2px 8px rgba(0,0,0,.1)}
.seg-block{display:block}

/* chips 选择 */
.chips{display:flex;flex-wrap:wrap;gap:9px}
.chip{padding:8px 16px;border-radius:999px;background:#f2f2f4;border:1.5px solid transparent;
  font-size:13.5px;font-weight:500;color:#48484c;transition:all .15s;user-select:none}
.chip:hover{background:#e8e8ec}
.chip.on{background:var(--blue-bg);border-color:var(--blue);color:var(--blue-deep);font-weight:600}
.chip-sm{padding:4px 11px;font-size:12px}

/* 表单 */
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;font-weight:600;color:#48484c;margin-bottom:7px}
.input,.select,.textarea{width:100%;border:1.5px solid var(--line);border-radius:12px;padding:11px 15px;
  background:#fff;outline:none;transition:border .15s}
.input:focus,.select:focus,.textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3.5px rgba(0,113,227,.13)}
.textarea{resize:vertical;min-height:120px;line-height:1.7}
.select{appearance:none;-webkit-appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M2 4l4 4 4-4' stroke='%2386868b' stroke-width='1.8' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 14px center;padding-right:38px}

/* 统计卡 */
.stat-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;position:relative;overflow:hidden}
.stat-card .st-ico{width:42px;height:42px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:20px;margin-bottom:12px}
.stat-card .st-num{font-size:32px;font-weight:800;letter-spacing:-1px;line-height:1.1}
.stat-card .st-num small{font-size:15px;font-weight:600;color:var(--sub)}
.stat-card .st-label{font-size:12.5px;color:var(--sub);margin-top:4px}
.stat-card .st-trend{position:absolute;top:18px;right:18px;font-size:11.5px;font-weight:600;padding:3px 9px;border-radius:999px}

/* 标签 */
.badge{display:inline-flex;align-items:center;gap:4px;font-size:11.5px;font-weight:600;padding:3px 10px;border-radius:999px}
.b-blue{background:var(--blue-bg);color:var(--blue-deep)} .b-green{background:var(--green-bg);color:#1e9e4a}
.b-red{background:var(--red-bg);color:#d32b23} .b-orange{background:var(--orange-bg);color:#c77400}
.b-purple{background:var(--purple-bg);color:var(--purple)} .b-gray{background:#f0f0f2;color:var(--sub)}

/* 列表行 */
.row-item{display:flex;align-items:center;gap:14px;padding:15px 4px;border-bottom:1px solid #f0f0f2}
.row-item:last-child{border-bottom:none}
.row-main{flex:1;min-width:0}
.row-title{font-weight:600;font-size:14.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.row-desc{font-size:12.5px;color:var(--sub);margin-top:3px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.row-actions{display:flex;gap:8px;flex-shrink:0}

/* 空状态 */
.empty{text-align:center;padding:50px 20px;color:var(--sub)}
.empty .em-ico{font-size:44px;margin-bottom:12px;filter:grayscale(30%)}
.empty p{font-size:14px}
.empty .btn{margin-top:16px}

/* 进度条 */
.bar{height:8px;background:#ededf0;border-radius:99px;overflow:hidden}
.bar>i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,#0071e3,#7c5cff);transition:width .5s ease}

/* toast */
#toast-wrap{position:fixed;top:20px;left:50%;transform:translateX(-50%);z-index:9999;display:flex;flex-direction:column;gap:10px;align-items:center}
.toast{background:rgba(29,29,31,.92);color:#fff;padding:11px 22px;border-radius:999px;font-size:14px;
  box-shadow:0 8px 30px rgba(0,0,0,.25);animation:toastIn .3s ease;display:flex;gap:8px;align-items:center;max-width:88vw}
.toast.ok::before{content:"✓";color:var(--green);font-weight:800}
.toast.err::before{content:"✕";color:var(--red);font-weight:800}
.toast.info::before{content:"ℹ️"}
@keyframes toastIn{from{opacity:0;transform:translateY(-12px) scale(.92)}to{opacity:1;transform:none}}

/* modal */
#modal-root{position:fixed;inset:0;z-index:900;display:flex;align-items:center;justify-content:center;padding:20px}
#modal-root[hidden]{display:none}
.mask{position:absolute;inset:0;background:rgba(0,0,0,.4);backdrop-filter:blur(6px);animation:fadeIn .2s}
.modal{position:relative;background:#fff;border-radius:24px;box-shadow:var(--shadow-lift);width:100%;max-width:520px;
  max-height:88vh;display:flex;flex-direction:column;animation:popIn .28s cubic-bezier(.2,1.2,.3,1)}
.modal.wide{max-width:760px}
.modal-h{display:flex;align-items:center;justify-content:space-between;padding:22px 26px 0}
.modal-h h3{font-size:19px;font-weight:700;letter-spacing:-.3px}
.modal-x{width:32px;height:32px;border-radius:50%;background:#f2f2f4;font-size:15px;display:flex;align-items:center;justify-content:center}
.modal-x:hover{background:#e8e8ec}
.modal-b{padding:18px 26px;overflow-y:auto;flex:1}
.modal-f{padding:16px 26px 24px;display:flex;gap:10px;justify-content:flex-end;border-top:1px solid #f0f0f2;flex-wrap:wrap}
@keyframes fadeIn{from{opacity:0}} @keyframes popIn{from{opacity:0;transform:scale(.88) translateY(14px)}}

/* tabs */
.tabs{display:flex;gap:6px;background:#ececf0;padding:4px;border-radius:13px;width:fit-content;max-width:100%;overflow-x:auto;margin-bottom:20px}
.tab-btn{padding:8px 20px;border-radius:10px;font-size:14px;font-weight:600;color:var(--sub);white-space:nowrap;transition:all .18s}
.tab-btn.active{background:#fff;color:var(--txt);box-shadow:0 2px 8px rgba(0,0,0,.1)}

/* ---------- 听写 ---------- */
.dict-step-tabs{display:flex;gap:8px;margin-bottom:22px;flex-wrap:wrap}
.dstep{display:flex;align-items:center;gap:8px;padding:8px 16px;border-radius:999px;background:#fff;
  border:1.5px solid var(--line);font-size:13.5px;font-weight:600;color:var(--sub)}
.dstep.on{border-color:var(--blue);color:var(--blue-deep);background:var(--blue-bg)}
.dstep .n{width:20px;height:20px;border-radius:50%;background:var(--line);color:#fff;display:flex;align-items:center;justify-content:center;font-size:11.5px}
.dstep.on .n{background:var(--blue)}
.word-preview{max-height:260px;overflow-y:auto;display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.wp-tag{background:#f2f2f4;border-radius:9px;padding:6px 12px;font-size:13.5px;display:flex;gap:8px;align-items:center}
.wp-tag .x{color:var(--sub);font-size:11px;cursor:pointer}
.wp-tag .x:hover{color:var(--red)}

#dict-overlay{position:fixed;inset:0;z-index:800;background:var(--bg);display:flex;flex-direction:column;overflow-y:auto}
#dict-overlay[hidden]{display:none}
.dict-head{display:flex;align-items:center;justify-content:space-between;padding:20px 34px;max-width:900px;width:100%;margin:0 auto}
.dict-head .dh-title{font-size:17px;font-weight:700}
.dict-head .dh-prog{color:var(--sub);font-size:13.5px}
.dict-stage{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:20px;text-align:center}
.dict-word-card{background:#fff;border-radius:28px;box-shadow:var(--shadow-lift);padding:50px 60px;max-width:640px;width:100%;position:relative}
.dw-status{font-size:13px;font-weight:600;color:var(--blue-deep);background:var(--blue-bg);border-radius:999px;padding:5px 16px;display:inline-flex;gap:6px;align-items:center;margin-bottom:18px}
.dw-pinyin{font-size:44px;font-weight:600;letter-spacing:6px;line-height:1.35;color:var(--txt);word-break:break-all}
.dw-hint{color:var(--sub);font-size:14px;margin-top:14px}
.dw-count{position:absolute;top:-26px;right:-14px;background:var(--blue);color:#fff;font-weight:800;font-size:15px;
  width:52px;height:52px;border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 6px 18px rgba(0,113,227,.4)}
.ring-wrap{position:relative;width:120px;height:120px;margin:26px auto 6px}
.ring-wrap svg{transform:rotate(-90deg)}
.ring-bg{fill:none;stroke:#e5e5ea;stroke-width:9}
.ring-fg{fill:none;stroke:var(--blue);stroke-width:9;stroke-linecap:round;transition:stroke-dashoffset 1s linear}
.ring-num{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:34px;font-weight:800;color:var(--txt)}
.dict-ctrls{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;padding:10px 20px 46px}
.dctrl{display:flex;flex-direction:column;align-items:center;gap:8px;font-size:12.5px;color:var(--sub);font-weight:600}
.dctrl .dc-btn{width:62px;height:62px;border-radius:50%;background:#fff;box-shadow:var(--shadow);font-size:23px;
  display:flex;align-items:center;justify-content:center;transition:all .18s;border:1.5px solid var(--line)}
.dctrl .dc-btn:hover{transform:translateY(-3px);box-shadow:var(--shadow-lift)}
.dctrl .dc-btn.main{width:74px;height:74px;background:var(--blue);color:#fff;border:none;font-size:27px;box-shadow:0 8px 24px rgba(0,113,227,.4)}
.dict-progress{height:6px;background:#e5e5ea;border-radius:99px;max-width:640px;width:calc(100% - 48px);margin:0 auto;overflow:hidden}
.dict-progress>i{display:block;height:100%;background:linear-gradient(90deg,#0071e3,#7c5cff);border-radius:99px;transition:width .4s}

/* 核对列表 */
.check-list .ck-row{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:14px;border:1.5px solid var(--line);margin-bottom:10px;background:#fff;transition:all .15s}
.check-list .ck-row.ok{border-color:var(--green);background:var(--green-bg)}
.check-list .ck-row.bad{border-color:var(--red);background:var(--red-bg)}
.ck-word{font-size:19px;font-weight:700;min-width:90px}
.ck-py{color:var(--sub);font-size:13px;flex:1}
.ck-btns{display:flex;gap:7px}
.ck-btn{width:40px;height:40px;border-radius:12px;font-size:17px;border:1.5px solid var(--line);background:#fff;display:flex;align-items:center;justify-content:center;transition:all .15s}
.ck-btn.yes.on{background:var(--green);border-color:var(--green);color:#fff}
.ck-btn.no.on{background:var(--red);border-color:var(--red);color:#fff}
.photo-thumb{width:100%;border-radius:14px;cursor:zoom-in;display:block}
.photo-box{position:relative;margin-top:12px}

/* ---------- 练习 ---------- */
.subject-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(104px,1fr));gap:11px}
.subj-tile{border:1.5px solid var(--line);border-radius:16px;padding:15px 8px;text-align:center;background:#fff;transition:all .18s}
.subj-tile:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.subj-tile.on{border-color:var(--blue);background:var(--blue-bg);box-shadow:0 0 0 3.5px rgba(0,113,227,.13)}
.subj-tile .sj-ico{font-size:26px;display:block;margin-bottom:6px}
.subj-tile .sj-name{font-size:13.5px;font-weight:600}
.q-card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:30px;margin-bottom:20px}
.q-meta{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}
.q-stem{font-size:17.5px;font-weight:600;line-height:1.7;margin-bottom:22px;white-space:pre-wrap}
.opt-btn{display:flex;align-items:center;gap:13px;width:100%;text-align:left;padding:15px 18px;border-radius:15px;
  border:1.5px solid var(--line);margin-bottom:11px;font-size:15.5px;background:#fff;transition:all .15s}
.opt-btn .ol{width:30px;height:30px;border-radius:50%;background:#f2f2f4;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;flex-shrink:0;color:#6e6e73}
.opt-btn:hover{border-color:#c7c7cc;transform:translateX(3px)}
.opt-btn.sel{border-color:var(--blue);background:var(--blue-bg)}
.opt-btn.sel .ol{background:var(--blue);color:#fff}
.opt-btn.correct{border-color:var(--green);background:var(--green-bg)}
.opt-btn.correct .ol{background:var(--green);color:#fff}
.opt-btn.wrong{border-color:var(--red);background:var(--red-bg)}
.opt-btn.wrong .ol{background:var(--red);color:#fff}
.ans-sheet{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.ans-cell{width:38px;height:38px;border-radius:11px;border:1.5px solid var(--line);display:flex;align-items:center;justify-content:center;font-size:13.5px;font-weight:700;color:var(--sub);cursor:pointer;background:#fff;transition:all .15s}
.ans-cell.done{background:var(--blue-bg);border-color:var(--blue);color:var(--blue-deep)}
.ans-cell.cur{outline:2.5px solid var(--blue);outline-offset:2px}
.ans-cell.miss{background:var(--red-bg);border-color:var(--red);color:#d32b23}
.explain-box{background:#f7f7f9;border-radius:14px;padding:16px 18px;font-size:14px;line-height:1.75;margin-top:6px}
.explain-box b{color:var(--blue-deep)}
.score-hero{text-align:center;padding:30px 10px 10px}
.score-hero .sc-num{font-size:72px;font-weight:800;letter-spacing:-3px;background:linear-gradient(135deg,#0071e3,#7c5cff);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.score-hero .sc-sub{color:var(--sub);margin-top:4px}

/* ---------- 学习 ---------- */
.lesson-card{cursor:pointer;transition:all .18s}
.lesson-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lift)}
.lesson-title{font-size:16px;font-weight:700;margin-bottom:8px;line-height:1.5}
.lesson-content p{margin-bottom:13px;font-size:15px;line-height:1.85;color:#3a3a3c}
.lesson-content .key-point{background:var(--blue-bg);border-left:4px solid var(--blue);border-radius:0 12px 12px 0;padding:12px 16px;margin:14px 0;font-size:14.5px}
.plan-day{margin-bottom:18px}
.plan-day h4{font-size:14px;font-weight:700;color:var(--sub);margin-bottom:9px;display:flex;gap:8px;align-items:center}
.plan-task{display:flex;align-items:center;gap:12px;background:#fff;border-radius:14px;padding:13px 16px;margin-bottom:9px;box-shadow:var(--shadow);border:1px solid #f0f0f2}
.plan-task.done{opacity:.55}
.plan-task .pt-check{width:24px;height:24px;border-radius:8px;border:1.8px solid #d1d1d6;display:flex;align-items:center;justify-content:center;color:#fff;font-size:13px;cursor:pointer;flex-shrink:0;transition:all .15s}
.plan-task.done .pt-check{background:var(--green);border-color:var(--green)}
.plan-task .pt-main{flex:1;min-width:0}
.plan-task .pt-title{font-size:14.5px;font-weight:600}
.plan-task .pt-sub{font-size:12px;color:var(--sub);margin-top:2px}

/* ---------- 错题本 ---------- */
.mistake-card{display:flex;gap:16px;align-items:flex-start}
.mistake-card .mk-photo{width:120px;height:120px;object-fit:cover;border-radius:14px;cursor:zoom-in;flex-shrink:0}
.mk-content{font-size:15px;line-height:1.7;white-space:pre-wrap;flex:1;min-width:0}
.mk-answer{margin-top:8px;font-size:13.5px;color:#1e9e4a;font-weight:600}

/* ---------- 图表 ---------- */
.chart-box{width:100%;overflow:hidden}
#chart-week{width:100%;height:190px;display:block}

/* ---------- 移动端 ---------- */
#mobile-nav{display:none}
#drawer-mask{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:60}
@media (max-width:960px){
  #sidebar{position:fixed;left:0;top:0;bottom:0;transform:translateX(-105%);transition:transform .25s;z-index:70;height:100dvh}
  #sidebar.open{transform:none;box-shadow:var(--shadow-lift)}
  #drawer-mask{display:block}
  #drawer-mask[hidden]{display:none}
  #btn-menu{display:inline-flex}
  #topbar{padding:14px 18px}
  #page-title{font-size:21px}
  #view-root{padding:6px 16px calc(86px + env(safe-area-inset-bottom))}
  #mobile-nav{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:55;background:rgba(255,255,255,.92);
    backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-top:1px solid var(--line);
    padding:7px 4px calc(7px + env(safe-area-inset-bottom))}
  .mnav-item{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;color:#98989d;font-size:20px;border-radius:10px;padding:3px 0}
  .mnav-item small{font-size:10px;font-weight:600}
  .mnav-item.active{color:var(--blue)}
  .card{padding:20px;border-radius:16px}
  .dict-word-card{padding:34px 22px}
  .dw-pinyin{font-size:32px;letter-spacing:3px}
  .q-card{padding:22px 18px}
  .q-stem{font-size:16px}
  .chip-info small{display:none}
  .stat-card .st-num{font-size:26px}
  .modal{border-radius:20px}
  .modal-b{padding:14px 20px}
  .modal-h{padding:18px 20px 0}
  .modal-f{padding:14px 20px 20px}
}
@media print{ #sidebar,#mobile-nav,#topbar,.dict-ctrls{display:none!important} }

/* ============ 课文朗读 ============ */
.rd-card{padding:18px 22px}
.rd-card-main{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap}
.rd-card-title{display:flex;align-items:center;gap:12px}
.rd-ico{font-size:24px}
.rd-card-title b{font-size:16px;display:block}
.rd-card-title small{color:var(--sub);font-size:12px}
.rd-card-preview{color:var(--sub);font-size:13px;margin:12px 0 0;padding-left:38px;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* 我的课文列表 */
.rd-item{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:13px 4px;
  border-bottom:1px solid var(--line);flex-wrap:wrap}
.rd-item:last-child{border-bottom:none}
.rd-item-main b{display:block;font-size:15px}
.rd-item-main small{color:var(--sub);font-size:12px}
.rd-item-ops{display:flex;gap:8px}
.empty-mini{color:var(--sub);text-align:center;padding:26px 0;font-size:14px}

/* 朗读器（全屏） */
#read-overlay{position:fixed;inset:0;z-index:800;background:var(--bg);display:flex;flex-direction:column}
.read-top{display:flex;align-items:center;gap:16px;padding:16px 22px;max-width:860px;width:100%;margin:0 auto}
.read-meta{flex:1;min-width:0}
.read-meta b{font-size:16px;display:block}
.read-meta small{color:var(--sub);font-size:12px}
.read-top-right{display:flex;gap:8px}
.read-scroll{flex:1;overflow-y:auto;padding:6px 22px 30px;-webkit-overflow-scrolling:touch}
.read-paper-wrap{max-width:860px;margin:0 auto}
.read-paper{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow-lift);
  padding:34px 36px;font-size:18px;line-height:2.05}
.read-para{cursor:pointer;border-radius:10px;padding:2px 8px;margin:0 0 10px;transition:background .18s}
.read-para:hover{background:rgba(0,113,227,.05)}
.read-para.on{background:var(--blue-bg)}
.read-para-block{margin-bottom:16px}
.read-para.en{font-size:17.5px;line-height:1.95}
.read-sent{cursor:pointer;border-radius:7px;padding:1px 2px;transition:background .15s}
.read-sent:hover{background:rgba(0,113,227,.07)}
.read-sent.on{background:var(--blue-bg);box-shadow:inset 0 -1.5px 0 var(--blue)}
.read-trans{color:var(--sub);font-size:14px;margin:2px 0 0;padding:0 8px}
.read-note{color:var(--sub);font-size:13px;background:rgba(0,113,227,.04);border:1px solid rgba(0,113,227,.12);
  border-radius:var(--radius-s);padding:12px 16px;margin-top:22px;line-height:1.7}

/* 底部控制条 */
.read-bar{background:rgba(255,255,255,.92);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  border-top:1px solid var(--line);padding:13px 22px;display:flex;align-items:center;justify-content:space-between;
  gap:14px;flex-wrap:wrap}
.read-bar-ops{display:flex;gap:10px;flex-wrap:wrap}
.read-bar-rate{display:flex;align-items:center;gap:10px}
.read-bar-rate input[type=range]{width:150px;accent-color:var(--blue)}
.read-bar-rate b{font-size:13px;color:var(--blue-deep);min-width:42px}

@media (max-width:768px){
  .read-top{padding:12px 16px}
  .read-scroll{padding:4px 14px 24px}
  .read-paper{padding:22px 20px;font-size:17px;line-height:2}
  .read-para.en{font-size:16.5px}
  .read-bar{padding:11px 14px}
  .read-bar-rate input[type=range]{width:110px}
  .rd-card-preview{padding-left:0}
}

/* 课文分组（Module） */
.rd-group{margin-bottom:6px}
.rd-group-title{font-size:14px;font-weight:700;color:var(--txt);margin:2px 4px 10px;
  display:flex;align-items:center;gap:8px}
.rd-group-title::before{content:'';width:4px;height:16px;border-radius:2px;background:var(--blue)}
.rd-unit-tag{display:inline-block;font-style:normal;font-size:11px;font-weight:600;color:var(--blue-deep);
  background:var(--blue-bg);border-radius:6px;padding:1px 7px;margin-right:7px;vertical-align:1px}

/* 朗读器：模式开关 & 定时器 */
.read-bar-modes{display:flex;gap:7px;flex-wrap:wrap;align-items:center}
.rd-mode{padding:7px 13px;border-radius:999px;border:1.5px solid var(--line);background:#fff;
  font-size:12.5px;font-weight:600;color:var(--sub);transition:all .15s}
.rd-mode:hover{border-color:#c7c7cc}
.rd-mode.on{background:var(--blue-bg);border-color:var(--blue);color:var(--blue-deep)}
.rd-mini-sel{border:1.5px solid var(--line);border-radius:999px;padding:7px 12px;font-size:12.5px;
  font-weight:600;background:#fff;color:var(--sub);outline:none;cursor:pointer;appearance:none;-webkit-appearance:none}
.rd-mini-sel:focus{border-color:var(--blue)}

/* 朗读器：跟读评测浮层 */
.rd-audio-badge{display:inline-flex;align-items:center;gap:3px;font-size:11px;font-weight:700;
  padding:2px 9px;border-radius:999px;background:linear-gradient(135deg,#ff9500,#ff6b35);
  color:#fff;vertical-align:2px;margin-left:8px}

/* 单元预习视频弹层 */
#video-overlay{position:fixed;inset:0;z-index:850;background:rgba(0,0,0,.92);
  display:flex;flex-direction:column;animation:fadeIn .2s}
.vd-top{display:flex;align-items:center;gap:14px;padding:14px 20px;color:#fff}
.vd-title{flex:1;text-align:center;min-width:0}
.vd-title b{display:block;font-size:16px}
.vd-title small{color:rgba(255,255,255,.55);font-size:12px}
.vd-stage{flex:1;display:flex;align-items:center;justify-content:center;padding:0 16px 30px}
.vd-stage video{width:100%;max-width:900px;max-height:calc(100vh - 120px);border-radius:16px;
  box-shadow:0 20px 80px rgba(0,0,0,.6);background:#000}

/* 单元随身听 */
#ua-overlay{position:fixed;inset:0;z-index:850;background:linear-gradient(180deg,#1c2438 0%,#2b3550 100%);
  display:flex;flex-direction:column;color:#fff;animation:fadeIn .2s}
.ua-top{display:flex;align-items:center;gap:14px;padding:14px 20px}
.ua-top .btn{background:rgba(255,255,255,.12);border-color:transparent;color:#fff}
.ua-title{flex:1;text-align:center;min-width:0}
.ua-title b{display:block;font-size:16px}
.ua-title small{color:rgba(255,255,255,.55);font-size:12px}
.ua-stage{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:10px 24px;gap:22px;overflow-y:auto}
.ua-cover{position:relative;width:min(52vw,300px);height:min(52vw,300px);border-radius:26px;overflow:hidden;
  box-shadow:0 18px 60px rgba(0,0,0,.45)}
.ua-cover img{width:100%;height:100%;object-fit:cover}
.ua-disk{position:absolute;right:-14px;bottom:-14px;width:86px;height:86px;border-radius:50%;
  background:radial-gradient(circle at center,#3a4560 18%,#222b40 19%);border:6px solid rgba(255,255,255,.85);
  display:flex;align-items:center;justify-content:center;animation:uaSpin 3.5s linear infinite}
.ua-disk-inner{width:12px;height:12px;border-radius:50%;background:#fff}
@keyframes uaSpin{to{transform:rotate(360deg)}}
.ua-now{text-align:center}
.ua-section{font-size:21px;font-weight:800;letter-spacing:.5px}
.ua-sub{font-size:14px;color:rgba(255,255,255,.66);margin-top:4px;min-height:20px}
.ua-dots{display:flex;gap:5px;flex-wrap:wrap;justify-content:center;max-width:520px}
.ua-dot{width:9px;height:9px;border-radius:50%;background:rgba(255,255,255,.22);cursor:pointer;transition:all .15s}
.ua-dot.w{background:rgba(120,200,255,.25)}
.ua-dot.on{background:#6ec5ff;transform:scale(1.35)}
.ua-bar{padding:14px 22px calc(18px + env(safe-area-inset-bottom));background:rgba(0,0,0,.25)}
.ua-prog{height:5px;border-radius:99px;background:rgba(255,255,255,.15);overflow:hidden;margin-bottom:13px}
.ua-prog i{display:block;height:100%;width:0;background:linear-gradient(90deg,#6ec5ff,#9db8ff);border-radius:99px;transition:width .3s}
.ua-ctrls{display:flex;align-items:center;justify-content:center;gap:34px}
.ua-btn{width:54px;height:54px;border-radius:50%;background:rgba(255,255,255,.12);color:#fff;
  font-size:21px;display:flex;align-items:center;justify-content:center;transition:all .15s}
.ua-btn:hover{background:rgba(255,255,255,.22)}
.ua-btn.main{width:70px;height:70px;font-size:27px;background:#fff;color:#1c2438;
  box-shadow:0 8px 26px rgba(255,255,255,.28)}
.ua-count{text-align:center;font-size:12px;color:rgba(255,255,255,.5);margin-top:10px;font-weight:600}
#rd-follow-hud{position:absolute;left:50%;bottom:118px;transform:translateX(-50%) translateY(14px);
  opacity:0;pointer-events:none;background:rgba(29,29,31,.92);color:#fff;border-radius:20px;
  padding:18px 34px;text-align:center;z-index:5;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  transition:all .25s ease;max-width:86vw;box-shadow:0 12px 40px rgba(0,0,0,.3)}
#rd-follow-hud.show{opacity:1;transform:translateX(-50%)}
#rd-follow-hud .rf-ico{font-size:34px;line-height:1.2}
#rd-follow-hud .rf-ico.mic{animation:rfPulse 1.1s ease-in-out infinite}
@keyframes rfPulse{0%,100%{transform:scale(1)}50%{transform:scale(1.16)}}
#rd-follow-hud .rf-txt{font-size:16.5px;font-weight:700;margin-top:6px}
#rd-follow-hud .rf-stars{font-size:22px;margin-top:5px;letter-spacing:3px}
#rd-follow-hud .rf-sub{font-size:12.5px;color:rgba(255,255,255,.68);margin-top:4px;max-width:320px;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
@media (max-width:768px){
  #rd-follow-hud{bottom:150px;padding:14px 22px}
  #rd-follow-hud .rf-ico{font-size:28px}
  #rd-follow-hud .rf-txt{font-size:15px}
}

/* ============ 单词闪卡 ============ */
.fc-units{display:flex;flex-wrap:wrap;gap:9px}
.fc-unit-chip{border:1.5px solid var(--line);border-radius:13px;padding:9px 14px;text-align:left;
  background:#fff;transition:all .15s}
.fc-unit-chip:hover{border-color:#c7c7cc;transform:translateY(-1px)}
.fc-unit-chip.on{border-color:var(--blue);background:var(--blue-bg)}
.fc-unit-chip b{display:block;font-size:13.5px;font-weight:600}
.fc-unit-chip.on b{color:var(--blue-deep)}
.fc-unit-chip small{color:var(--sub);font-size:11.5px}
.fc-stage{display:flex;flex-direction:column;align-items:center;padding-top:6px}
.fc-progress{width:100%;max-width:560px;height:7px;background:#ededf0;border-radius:99px;overflow:hidden}
.fc-progress i{display:block;height:100%;background:linear-gradient(90deg,#0071e3,#7c5cff);
  border-radius:99px;transition:width .4s}
.fc-count{color:var(--sub);font-size:13px;margin:10px 0 20px;font-weight:600}
.fc-card{width:100%;max-width:560px;height:300px;perspective:1300px;cursor:pointer;position:relative}
.fc-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;
  border-radius:24px;background:#fff;box-shadow:var(--shadow-lift);display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:13px;transition:transform .5s cubic-bezier(.2,1,.3,1);padding:20px}
.fc-back{transform:rotateY(180deg)}
.fc-card.flipped .fc-front{transform:rotateY(-180deg)}
.fc-card.flipped .fc-back{transform:rotateY(0)}
.fc-word{font-size:44px;font-weight:800;letter-spacing:-.5px;word-break:break-word;text-align:center}
.fc-phonetic{color:var(--sub);font-size:17px}
.fc-meaning{font-size:21px;color:var(--blue-deep);font-weight:600;text-align:center;line-height:1.6;word-break:break-word}
.fc-meaning.pinyin{letter-spacing:3px;font-size:23px}
.fc-speak{padding:8px 18px;border-radius:999px;background:var(--blue-bg);color:var(--blue-deep);
  font-size:13.5px;font-weight:600;transition:all .15s}
.fc-speak:hover{background:#d8eaff}
.fc-tap-hint{color:#c7c7cc;font-size:12px}
.fc-ops{display:flex;gap:14px;margin-top:24px;flex-wrap:wrap;justify-content:center}
.fc-foot{margin-top:16px}
.fc-done{text-align:center;padding:52px 24px}
.fc-done-ico{font-size:58px}
.fc-done h2{font-size:24px;margin:12px 0 8px;letter-spacing:-.3px}
.fc-done-stats{color:var(--sub);font-size:15px}
.fc-done-stats b.ok{color:#1e9e4a}
.fc-done-stats b.no{color:var(--orange)}
.fc-done-ops{display:flex;gap:12px;justify-content:center;margin-top:22px;flex-wrap:wrap}
@media (max-width:768px){
  .fc-card{height:260px}
  .fc-word{font-size:34px}
  .fc-meaning{font-size:18px}
  .fc-meaning.pinyin{font-size:19px}
}

/* ============ 学习打卡 ============ */
.streak-badge{display:inline-flex;align-items:center;gap:4px;font-size:12.5px;font-weight:700;
  padding:4px 12px;border-radius:999px;background:#f0f0f2;color:var(--sub);vertical-align:2px;margin-left:6px}
.streak-badge.lit{background:linear-gradient(135deg,#ff9500,#ff6b35);color:#fff;
  box-shadow:0 3px 10px rgba(255,140,50,.35)}
.hm-grid{display:grid;grid-template-rows:repeat(7,15px);grid-auto-flow:column;gap:4px;justify-content:start;overflow-x:auto;padding-bottom:2px}
.hm-cell{width:15px;height:15px;border-radius:4px;background:#ededf0;display:inline-block;flex-shrink:0}
.hm-cell.l1{background:#c9ecd2}
.hm-cell.l2{background:#8fdc9f}
.hm-cell.l3{background:#34c759}
.hm-cell.today{outline:2px solid var(--blue);outline-offset:1.5px}
.hm-legend{display:flex;gap:7px;align-items:center;font-size:11.5px;color:var(--sub);margin-top:12px}
.hm-legend .hm-cell{width:12px;height:12px;border-radius:3px}