:root{
  --navy:#1F3B57;
  --navy-2:#173049;
  --navy-3:#122739;
  --teal:#2E8B89;
  --teal-2:#48A9A2;
  --teal-soft:#E3F0EF;
  --orange:#D98324;
  --orange-2:#C8751C;
  --orange-soft:#FBEEDD;
  --cream:#F7F5F0;
  --paper:#FFFDF9;
  --ink:#22303C;
  --body:#3A4753;
  --muted:#6E7C88;
  --line:#E6DFD3;
  --green:#3C8A5A;
  --red:#C0553F;
  --serif:"Source Han Serif SC","Noto Serif SC","Songti SC",STSong,Georgia,"Times New Roman",serif;
  --sans:"Microsoft YaHei","PingFang SC","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:ui-monospace,"Cascadia Mono",Consolas,"Courier New",monospace;
  --radius:18px;
  --shadow:0 12px 30px rgba(31,59,87,.09);
  --shadow-lg:0 26px 60px rgba(23,48,73,.16);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:136px}
body{margin:0;font-family:var(--sans);color:var(--body);background:var(--cream);line-height:1.7;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;border:0;background:none;cursor:pointer}
::selection{background:#CFE7E1;color:var(--navy)}
.wrap{width:min(1180px,92vw);margin:0 auto}
.mono{font-family:var(--mono)}

/* ---------- 顶部导航 ---------- */
.topbar{position:sticky;top:0;z-index:80;background:rgba(247,245,240,.88);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid rgba(31,59,87,.08)}
.topbar-in{display:flex;align-items:center;gap:26px;height:72px}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.brand-mark{width:40px;height:40px;flex:none;border-radius:12px;background:var(--navy);color:#fff;display:grid;place-items:center;font-weight:700;font-size:14px;letter-spacing:.06em;box-shadow:0 6px 16px rgba(31,59,87,.24)}
.brand-txt{display:flex;flex-direction:column;line-height:1.25;min-width:0}
.brand-txt strong{font-family:var(--serif);font-size:17px;color:var(--navy);white-space:nowrap}
.brand-txt em{font-style:normal;font-size:11.5px;color:var(--muted);letter-spacing:.03em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.nav{margin-left:auto;display:flex;gap:4px}
.nav-link{position:relative;padding:8px 15px;border-radius:999px;font-size:14.5px;color:#4A5A66;transition:color .2s,background .2s;white-space:nowrap}
.nav-link:hover{color:var(--navy);background:rgba(46,139,137,.1)}
.nav-link.active{color:#fff;background:var(--navy);box-shadow:0 6px 14px rgba(31,59,87,.2)}
.nav-toggle{display:none;width:42px;height:42px;border-radius:12px;border:1px solid var(--line);background:#fff;align-items:center;justify-content:center}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--navy);position:relative;transition:.25s}
.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--navy);transition:.25s}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}
.nav-toggle[aria-expanded="true"] span{background:transparent}
.nav-toggle[aria-expanded="true"] span::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::after{top:0;transform:rotate(-45deg)}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border-radius:999px;font-size:14.5px;font-weight:600;border:1px solid transparent;transition:transform .22s,background .22s,box-shadow .22s,color .22s;cursor:pointer}
.btn-primary{background:var(--orange);color:#fff;box-shadow:0 12px 26px rgba(217,131,36,.32)}
.btn-primary:hover{background:var(--orange-2);transform:translateY(-2px)}
.btn-ghost{border-color:rgba(255,255,255,.35);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.btn-outline{border-color:var(--line);background:#fff;color:var(--navy)}
.btn-outline:hover{border-color:var(--teal);color:var(--teal);transform:translateY(-1px)}
.btn-text{color:var(--muted);padding:12px 10px}
.btn-text:hover{color:var(--red)}
.btn-sm{padding:8px 16px;font-size:13px}

/* ---------- 首屏 ---------- */
.hero{position:relative;overflow:hidden;color:#fff;padding:82px 0 88px;background:
  radial-gradient(1100px 520px at 8% -18%, #2C5175 0%, rgba(44,81,117,0) 62%),
  radial-gradient(900px 500px at 96% 108%, #235a58 0%, rgba(35,90,88,0) 58%),
  linear-gradient(158deg,#1F3B57 0%,#183450 56%,#132C43 100%)}
.hero::after{content:"";position:absolute;inset:0;pointer-events:none;background-image:radial-gradient(rgba(255,255,255,.08) 1px,transparent 1px);background-size:23px 23px;opacity:.5;mask-image:linear-gradient(180deg,rgba(0,0,0,.7),transparent 75%)}
.hero-in{position:relative;z-index:2;display:grid;grid-template-columns:1.08fr .92fr;gap:56px;align-items:center}
.eyebrow{font-size:11.5px;letter-spacing:.24em;text-transform:uppercase;color:#8FC7C4;font-weight:600;margin:0 0 14px}
.hero h1{font-family:var(--serif);font-size:clamp(46px,6.4vw,76px);line-height:1.02;letter-spacing:-.01em;margin:0 0 10px;font-weight:700}
.hero h1 span{color:#E9A14B;font-style:italic;letter-spacing:.01em}
.hero-cn{font-size:19px;letter-spacing:.34em;color:rgba(255,255,255,.9);margin:0 0 20px;font-weight:300}
.hero-lead{max-width:540px;color:rgba(255,255,255,.76);font-size:15.5px;line-height:1.9;margin:0 0 30px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:38px}
.hero-stats{display:flex;flex-wrap:wrap;gap:28px;list-style:none;margin:0;padding:22px 0 0;border-top:1px solid rgba(255,255,255,.16)}
.hero-stats li{display:flex;flex-direction:column;gap:2px}
.hero-stats strong{font-family:var(--serif);font-size:26px;line-height:1.1;color:#fff;font-weight:700}
.hero-stats span{font-size:12px;color:rgba(255,255,255,.6);letter-spacing:.05em}
.hero-art{position:relative}
.hero-img{border-radius:22px;overflow:hidden;aspect-ratio:4/3.5;border:1px solid rgba(255,255,255,.16);box-shadow:0 34px 70px rgba(6,20,32,.5);background:#223A4E}
.hero-img img{width:100%;height:100%;object-fit:cover}
.tag{position:absolute;display:inline-flex;align-items:center;gap:8px;background:rgba(255,253,249,.95);color:var(--navy);font-size:12.5px;font-weight:600;padding:9px 15px;border-radius:999px;box-shadow:0 12px 26px rgba(6,20,32,.28);letter-spacing:.01em}
.tag::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--teal)}
.tag-1{top:8%;left:-26px;animation:float 6s ease-in-out infinite}
.tag-2{right:-18px;top:44%;animation:float 7s ease-in-out infinite .8s}
.tag-2::before{background:var(--orange)}
.tag-3{bottom:7%;left:6%;animation:float 8s ease-in-out infinite .4s}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-9px)}}

/* ---------- 通用区块 ---------- */
.section{padding:84px 0}
.section-head{max-width:760px;margin-bottom:44px}
.section-head .eyebrow{color:var(--teal);margin-bottom:8px}
.section-head h2{font-family:var(--serif);font-size:clamp(28px,3.6vw,40px);line-height:1.28;color:var(--navy);margin:0 0 12px;letter-spacing:.005em;font-weight:700}
.section-head p{margin:0;color:var(--muted);font-size:15.5px;line-height:1.85}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.band-white{background:var(--paper);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}

/* ---------- 学习目标 ---------- */
.goals{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.goal{background:#fff;border:1px solid var(--line);border-radius:16px;padding:26px 22px 24px;transition:transform .25s,box-shadow .25s;position:relative;overflow:hidden}
.goal::after{content:"";position:absolute;left:0;top:0;width:100%;height:3px;background:linear-gradient(90deg,var(--teal),var(--orange));opacity:0;transition:.25s}
.goal:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.goal:hover::after{opacity:1}
.goal .num{font-family:var(--serif);font-size:28px;color:var(--orange);line-height:1;font-weight:700}
.goal h3{font-size:16px;color:var(--navy);margin:14px 0 8px;font-weight:700}
.goal p{margin:0;font-size:13.5px;line-height:1.75;color:var(--muted)}

/* ---------- 文化概念卡 ---------- */
.concepts{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.concept{background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden;transition:transform .28s,box-shadow .28s}
.concept:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.concept .imgbox{aspect-ratio:16/10}
.concept-body{padding:20px 22px 24px}
.concept-body .k{font-family:var(--mono);font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--teal);font-weight:600}
.concept-body h3{font-family:var(--serif);font-size:22px;color:var(--navy);margin:7px 0 9px}
.concept-body p{margin:0;font-size:13.5px;color:var(--muted);line-height:1.8}

/* ---------- 图片容器 ---------- */
.imgbox{position:relative;overflow:hidden;background:linear-gradient(135deg,#E9E2D6,#DCE6E4)}
.imgbox img{width:100%;height:100%;object-fit:cover;opacity:0;transition:opacity .6s ease}
.imgbox img.loaded{opacity:1}
.imgbox.failed::before{content:attr(data-label);position:absolute;inset:0;display:grid;place-items:center;font-family:var(--serif);font-size:15px;color:#8A9AA0;letter-spacing:.04em;padding:12px;text-align:center}

/* ---------- 文化对照表 ---------- */
.table-wrap{margin-top:46px;overflow-x:auto;border-radius:16px;box-shadow:var(--shadow);-webkit-overflow-scrolling:touch}
.ctable{width:100%;border-collapse:collapse;background:#fff;font-size:14px;min-width:640px}
.ctable caption{caption-side:top;text-align:left;font-size:13px;color:var(--muted);padding:0 0 12px;font-weight:600;letter-spacing:.04em}
.ctable th{background:var(--navy);color:#fff;text-align:left;padding:14px 18px;font-size:13px;font-weight:600;letter-spacing:.06em}
.ctable td{padding:14px 18px;border-top:1px solid var(--line);color:var(--body);vertical-align:top;line-height:1.75}
.ctable tr:nth-child(even) td{background:#FBF8F2}
.ctable td:first-child{font-weight:700;color:var(--navy);white-space:nowrap}

/* ---------- 单元任务横幅 ---------- */
.task-banner{display:grid;grid-template-columns:1fr auto;gap:32px;align-items:center;margin-top:52px;padding:38px 42px;border-radius:22px;background:linear-gradient(120deg,#1F3B57,#2A4C6E 60%,#235A58);color:#fff;position:relative;overflow:hidden;box-shadow:0 22px 50px rgba(31,59,87,.22)}
.task-banner::before{content:"";position:absolute;right:-70px;top:-90px;width:280px;height:280px;border-radius:50%;background:rgba(217,131,36,.18);filter:blur(4px)}
.task-banner::after{content:"";position:absolute;left:38%;bottom:-120px;width:240px;height:240px;border-radius:50%;border:1px solid rgba(255,255,255,.14)}
.task-banner .tb-k{font-size:11.5px;letter-spacing:.24em;text-transform:uppercase;color:#8FC7C4;font-weight:600;margin:0 0 10px;position:relative}
.task-banner h3{font-family:var(--serif);font-size:clamp(22px,2.6vw,30px);margin:0 0 10px;position:relative;line-height:1.35}
.task-banner p{margin:0;color:rgba(255,255,255,.78);font-size:14.5px;max-width:620px;position:relative}
.task-banner .btn{position:relative;flex:none}

/* ---------- 课文精读 ---------- */
.reader-tabs{display:inline-flex;gap:4px;background:#EBE4D8;padding:5px;border-radius:999px;margin-bottom:22px;flex-wrap:wrap}
.tab{padding:10px 20px;border-radius:999px;font-size:13.5px;color:#5A6873;transition:.22s;font-weight:600}
.tab:hover{color:var(--navy)}
.tab.active{background:#fff;color:var(--navy);box-shadow:0 4px 14px rgba(31,59,87,.14)}
.reader{background:var(--paper);border:1px solid var(--line);border-radius:22px;padding:clamp(24px,4.4vw,54px);box-shadow:var(--shadow);position:relative}
.reader-kicker{font-family:var(--mono);font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--teal);font-weight:600}
.reader h3{font-family:var(--serif);font-size:clamp(24px,3vw,32px);line-height:1.35;color:var(--navy);margin:8px auto 10px;font-weight:700}
.reader-meta{font-size:12.5px;color:var(--muted);letter-spacing:.03em;display:flex;gap:14px;flex-wrap:wrap}
.reader-meta span{display:inline-flex;align-items:center;gap:6px}
.reader-meta span::before{content:"";width:4px;height:4px;border-radius:50%;background:var(--orange)}
.brief{margin:22px auto 30px;background:var(--cream);border:1px solid var(--line);border-radius:14px;padding:16px 20px;font-size:13.5px;color:#55636F}
.brief summary{cursor:pointer;font-weight:700;color:var(--navy);font-size:13.5px;letter-spacing:.04em;list-style:none;display:flex;align-items:center;gap:8px}
.brief summary::-webkit-details-marker{display:none}
.brief summary::before{content:"+";font-family:var(--mono);color:var(--teal);font-weight:700;font-size:15px;width:14px}
.brief[open] summary::before{content:"–"}
.brief p{margin:12px 0 0;line-height:1.85}
.article{max-width:800px;margin:0 auto}
.article p{font-family:Georgia,"Times New Roman",var(--serif);font-size:17.5px;line-height:1.92;color:#2B3843;margin:0 0 22px;text-align:justify;hyphens:auto}
.pno{display:inline-grid;place-items:center;min-width:24px;height:24px;padding:0 5px;border-radius:50%;background:var(--orange-soft);color:#A9661A;font-family:var(--sans);font-size:12px;font-weight:700;margin-right:10px;vertical-align:2px;line-height:1}
.gloss{display:inline;background:none;border:0;border-bottom:1.5px dashed var(--teal);padding:0 1px;margin:0;font:inherit;color:var(--navy);cursor:pointer;border-radius:3px;transition:background .18s,color .18s,border-color .18s}
.gloss:hover,.gloss:focus-visible{background:var(--teal-soft);outline:none;border-bottom-color:var(--teal)}
.gloss.seen{background:linear-gradient(transparent 64%,rgba(46,139,137,.22) 64%)}
.gloss.mastered{background:#DCEFE7;border-bottom-color:transparent;color:#256B54}
.legend{display:flex;flex-wrap:wrap;gap:8px 22px;margin-top:30px;padding-top:18px;border-top:1px dashed var(--line);font-size:12.5px;color:var(--muted)}
.reader > *{max-width:800px;margin-left:auto;margin-right:auto}
.legend span{display:inline-flex;align-items:center;gap:8px}
.legend .sample{font-family:Georgia,serif;color:var(--navy);border-bottom:1.5px dashed var(--teal);padding:0 1px}
.legend .sample.m{background:#DCEFE7;border-bottom-color:transparent;color:#256B54}

/* ---------- 生词浮层 ---------- */
.popover{position:absolute;z-index:140;width:344px;background:#fff;border:1px solid #EBE3D7;border-radius:18px;box-shadow:0 28px 60px rgba(18,40,60,.26);overflow:hidden;opacity:0;transform:translateY(6px) scale(.98);pointer-events:none;transition:opacity .2s ease,transform .2s ease;visibility:hidden}
.popover.show{opacity:1;transform:none;pointer-events:auto;visibility:visible}
.wordcard .wc-media{position:relative;aspect-ratio:16/10;background:linear-gradient(135deg,#E9E2D6,#DCE6E4)}
.wordcard .wc-media img{width:100%;height:100%;object-fit:cover;opacity:0;transition:opacity .5s}
.wordcard .wc-media img.loaded{opacity:1}
.wordcard .wc-media.failed::before{content:attr(data-label);position:absolute;inset:0;display:grid;place-items:center;color:#8A9AA0;font-family:var(--serif);font-size:14px}
.wc-cat{position:absolute;left:12px;top:12px;background:rgba(255,253,249,.94);color:var(--navy);font-size:11px;font-weight:700;letter-spacing:.06em;padding:5px 10px;border-radius:999px;box-shadow:0 4px 12px rgba(0,0,0,.12)}
.wc-body{padding:18px 20px 20px}
.wc-head{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.wc-word{font-family:var(--serif);font-size:25px;color:var(--navy);line-height:1.2;font-weight:700}
.wc-ph{font-family:var(--mono);font-size:12.5px;color:var(--muted)}
.pos{font-size:11.5px;font-weight:700;color:var(--teal);background:var(--teal-soft);padding:2px 7px;border-radius:6px;font-family:var(--mono)}
.wc-cn{font-size:18px;font-weight:700;color:var(--ink);margin:8px 0 4px;line-height:1.45}
.wc-def{font-size:13px;color:var(--muted);margin:0;line-height:1.65}
.wc-ex{margin:13px 0 0;background:var(--cream);border-left:3px solid var(--teal);border-radius:0 10px 10px 0;padding:11px 13px}
.wc-ex .en{font-family:Georgia,serif;font-size:14px;line-height:1.65;color:#33404B;margin:0}
.wc-ex .en mark{background:transparent;color:var(--teal);font-weight:700}
.wc-ex .cn{font-size:12px;color:var(--muted);margin:5px 0 0;line-height:1.6}
.wc-actions{display:flex;gap:8px;margin-top:14px}
.icon-btn{flex:1;display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:9px 12px;border-radius:10px;border:1px solid var(--line);background:#fff;font-size:12.5px;font-weight:600;color:var(--navy);transition:.2s}
.icon-btn:hover{border-color:var(--teal);color:var(--teal);background:#F4FBF9}
.icon-btn.on{background:var(--teal);border-color:var(--teal);color:#fff}
.icon-btn svg{width:14px;height:14px;flex:none}

/* ---------- 生词弹窗 ---------- */
.modal{position:fixed;inset:0;z-index:220;display:none;align-items:center;justify-content:center;padding:22px}
.modal.open{display:flex}
.modal-backdrop{position:absolute;inset:0;background:rgba(15,33,50,.58);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}
.modal-card{position:relative;background:#fff;border-radius:22px;width:min(780px,100%);max-height:88vh;overflow:auto;box-shadow:0 40px 90px rgba(0,0,0,.34);animation:pop .3s cubic-bezier(.2,.8,.3,1)}
@keyframes pop{from{opacity:0;transform:translateY(14px) scale(.97)}to{opacity:1;transform:none}}
.modal-grid{display:block}
.modal-grid .wordcard{display:grid;grid-template-columns:.94fr 1.06fr}
.modal-grid .wordcard .wc-media{aspect-ratio:1/1;height:100%;min-height:320px}
.modal-grid .wordcard .wc-body{padding:30px 32px 28px;display:flex;flex-direction:column;justify-content:center}
.modal-grid .wc-word{font-size:32px}
.modal-grid .wc-cn{font-size:21px}
.modal-grid .wc-def{font-size:14px}
.modal-grid .wc-ex .en{font-size:15px}
.close-x{position:absolute;top:12px;right:12px;z-index:5;width:36px;height:36px;border-radius:50%;background:rgba(255,255,255,.94);box-shadow:0 4px 14px rgba(0,0,0,.18);display:grid;place-items:center;color:var(--navy);font-size:18px;line-height:1;transition:.2s}
.close-x:hover{background:#fff;transform:rotate(90deg)}

/* ---------- 词汇图卡 ---------- */
.vocab-tools{display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between;margin-bottom:26px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{padding:8px 16px;border-radius:999px;border:1px solid var(--line);background:#fff;font-size:13px;color:#54626E;transition:.2s;font-weight:600}
.chip:hover{border-color:var(--teal);color:var(--teal)}
.chip.active{background:var(--navy);border-color:var(--navy);color:#fff;box-shadow:0 6px 16px rgba(31,59,87,.18)}
.vprogress{min-width:190px}
.vprogress .t{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-bottom:6px;letter-spacing:.03em}
.vprogress .t b{color:var(--teal)}
.bar{height:6px;border-radius:99px;background:#E7E0D4;overflow:hidden}
.bar i{display:block;height:100%;width:0;border-radius:99px;background:linear-gradient(90deg,var(--teal),var(--teal-2));transition:width .45s ease}
.vgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(212px,1fr));gap:18px}
.vcard{position:relative;background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;text-align:left;transition:transform .26s,box-shadow .26s,opacity .26s;display:flex;flex-direction:column;padding:0;width:100%}
.vcard:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.vcard .imgbox{aspect-ratio:16/11}
.vcard-body{padding:14px 16px 16px;flex:1;display:flex;flex-direction:column;gap:3px}
.vcard .w{font-family:var(--serif);font-size:19.5px;color:var(--navy);font-weight:700;line-height:1.3}
.vcard .ph{font-family:var(--mono);font-size:11.5px;color:var(--muted)}
.vcard .cn{font-size:13.5px;color:#4E5C68;margin-top:3px;line-height:1.55}
.vcard .cat{margin-top:auto;padding-top:10px;font-size:11px;color:var(--teal);letter-spacing:.06em;font-weight:700}
.vcard.mastered{opacity:.78}
.vcard.mastered .w{color:#256B54}
.mcheck{position:absolute;top:10px;right:10px;width:27px;height:27px;border-radius:50%;background:rgba(255,255,255,.94);border:1px solid rgba(31,59,87,.12);display:grid;place-items:center;color:#B9C2C8;transition:.2s;box-shadow:0 3px 10px rgba(0,0,0,.1);z-index:2}
.vcard.mastered .mcheck{background:var(--teal);border-color:var(--teal);color:#fff}
.mcheck svg{width:13px;height:13px}

/* ---------- 单元任务 ---------- */
.task-sec{background:var(--cream);border-top:1px solid var(--line)}
.task-grid{display:grid;grid-template-columns:1.22fr .78fr;gap:26px;align-items:start}
.brief-card{background:#fff;border:1px solid var(--line);border-left:4px solid var(--orange);border-radius:16px;padding:26px 28px;box-shadow:var(--shadow)}
.brief-card .bk{font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--orange);font-weight:700;margin:0 0 8px}
.brief-card h3{font-family:var(--serif);font-size:21px;color:var(--navy);margin:0 0 10px;line-height:1.45}
.brief-card p{margin:0 0 12px;font-size:14px;line-height:1.85;color:var(--body)}
.brief-card p:last-child{margin-bottom:0}
.specs{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.spec{font-size:11.5px;font-weight:600;color:var(--teal);background:var(--teal-soft);border-radius:999px;padding:5px 11px;letter-spacing:.02em}
.steps{list-style:none;margin:26px 0 0;padding:0}
.step{display:grid;grid-template-columns:52px 1fr;gap:16px;position:relative;padding-bottom:22px}
.step:last-child{padding-bottom:0}
.step::before{content:"";position:absolute;left:25px;top:52px;bottom:0;width:1px;background:var(--line)}
.step:last-child::before{display:none}
.step .n{width:52px;height:52px;border-radius:14px;background:#fff;border:1px solid var(--line);display:grid;place-items:center;font-family:var(--serif);font-size:19px;color:var(--navy);font-weight:700;position:relative;z-index:1;box-shadow:0 4px 12px rgba(31,59,87,.06)}
.step h4{font-size:15px;color:var(--navy);margin:2px 0 6px}
.step p{font-size:13.5px;color:var(--muted);line-height:1.8;margin:0}
.step p b{color:var(--body)}
.outline{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px 26px;margin-top:24px;box-shadow:var(--shadow)}
.outline h4{font-family:var(--serif);font-size:19px;color:var(--navy);margin:0 0 6px}
.outline .sub{font-size:12.5px;color:var(--muted);margin:0 0 10px}
.part{display:grid;grid-template-columns:124px 1fr;gap:14px;padding:12px 0;border-top:1px dashed var(--line)}
.part:first-of-type{border-top:0}
.part .p-t{font-weight:700;color:var(--navy);font-size:13.5px;line-height:1.6}
.part .p-d{font-size:13px;color:var(--muted);line-height:1.7}
.toolbox{background:var(--navy);color:#fff;border-radius:18px;padding:24px 24px 18px;position:sticky;top:96px;max-height:calc(100vh - 118px);overflow:auto;box-shadow:0 20px 44px rgba(31,59,87,.22)}
.toolbox h4{font-family:var(--serif);font-size:19px;margin:0 0 4px;color:#fff}
.toolbox .sub{font-size:11.5px;color:rgba(255,255,255,.55);margin:0 0 14px}
.phrase{border-top:1px solid rgba(255,255,255,.12);padding:12px 0;position:relative}
.phrase p{margin:0}
.phrase .en{font-family:Georgia,serif;font-size:13.5px;line-height:1.65;color:#fff;padding-right:54px}
.phrase .cn{font-size:11.5px;color:rgba(255,255,255,.58);margin-top:3px;line-height:1.6}
.copy{position:absolute;right:0;top:12px;font-size:10.5px;color:#8FC7C4;border:1px solid rgba(143,199,196,.4);padding:3px 9px;border-radius:999px;transition:.2s;letter-spacing:.03em}
.copy:hover{background:rgba(143,199,196,.14)}
.copy.done{background:var(--teal);border-color:var(--teal);color:#fff}
.rubric{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px 28px;margin-top:26px;box-shadow:var(--shadow)}
.rubric h3{font-family:var(--serif);font-size:20px;color:var(--navy);margin:0 0 4px}
.rubric .sub{font-size:12.5px;color:var(--muted);margin:0 0 16px}
.rtable{width:100%;border-collapse:collapse;font-size:13.5px}
.rtable th{text-align:left;font-size:12px;letter-spacing:.05em;color:var(--muted);font-weight:700;padding:0 0 8px;border-bottom:1px solid var(--line)}
.rtable td{padding:11px 0;border-bottom:1px dashed var(--line);vertical-align:top;line-height:1.65;color:var(--body)}
.rtable td:first-child{font-weight:700;color:var(--navy);width:26%}
.rtable td:nth-child(2){width:12%;color:var(--orange);font-family:var(--mono);font-weight:700}
.rtable tr:last-child td{border-bottom:0}
.editor{background:#fff;border:1px solid var(--line);border-radius:18px;margin-top:26px;overflow:hidden;box-shadow:var(--shadow)}
.editor-head{display:flex;justify-content:space-between;align-items:center;gap:14px;padding:18px 26px;border-bottom:1px solid var(--line);background:#FCFAF5;flex-wrap:wrap}
.editor-head h3{font-family:var(--serif);font-size:20px;color:var(--navy);margin:0}
.editor-stats{display:flex;gap:16px;font-size:12px;color:var(--muted);align-items:center;flex-wrap:wrap}
.editor-stats #gCount{color:var(--teal);font-weight:700;font-family:var(--mono)}
#guideText{display:block;width:100%;min-height:340px;border:0;padding:24px 26px;font-family:Georgia,"Times New Roman",var(--serif);font-size:15.5px;line-height:1.95;color:#2B3843;resize:vertical;outline:none;background:transparent}
#guideText:focus{background:#FFFEFB}
.editor-bar{display:flex;flex-wrap:wrap;gap:10px;padding:14px 22px;border-top:1px solid var(--line);background:#FCFAF5;align-items:center}
.editor-bar .btn-text{margin-left:auto}

/* ---------- 复习专栏 ---------- */
.review-sec{background:linear-gradient(180deg,#F1EDE4 0%,#F7F5F0 40%);border-top:1px solid var(--line)}
.quiz-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:clamp(22px,3.4vw,34px);box-shadow:var(--shadow)}
.quiz-top{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:6px}
.quiz-top h3{font-family:var(--serif);font-size:24px;color:var(--navy);margin:0}
.quiz-top .sub{font-size:12.5px;color:var(--muted);margin:4px 0 0}
.quiz-score{font-size:12.5px;color:var(--muted);letter-spacing:.04em}
.quiz-score b{font-family:var(--serif);font-size:26px;color:var(--orange);margin-right:2px}
.quiz-item{padding:22px 0;border-top:1px solid var(--line)}
.quiz-item:first-of-type{border-top:1px solid var(--line);margin-top:14px}
.q-text{display:flex;gap:12px;font-size:15px;color:var(--ink);font-weight:700;line-height:1.65;margin:0 0 12px}
.q-no{font-family:var(--mono);font-size:12px;color:var(--orange);flex:none;padding-top:3px;font-weight:600}
.opts{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-left:30px}
.opt{text-align:left;border:1px solid var(--line);background:#fff;border-radius:10px;padding:10px 14px;font-size:13.5px;color:var(--body);transition:.18s;display:flex;gap:9px;align-items:flex-start;line-height:1.6}
.opt:hover{border-color:var(--teal);background:#F6FBF9}
.opt .k{font-family:var(--mono);font-size:12px;color:var(--muted);flex:none;padding-top:1px}
.opt.correct{border-color:var(--green);background:#EDF7F0;color:#256B45}
.opt.correct .k{color:var(--green)}
.opt.wrong{border-color:var(--red);background:#FBEFEC;color:#9E4634}
.opt.wrong .k{color:var(--red)}
.opt:disabled{cursor:default}
.why{margin:12px 0 0 30px;padding:10px 14px;background:var(--orange-soft);border-radius:10px;font-size:12.5px;color:#8A5A1C;line-height:1.75;display:none}
.why.show{display:block}
.quiz-result{margin-top:22px;padding:20px 24px;border-radius:14px;background:var(--teal-soft);display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.quiz-result[hidden]{display:none}
.quiz-result strong{font-family:var(--serif);font-size:21px;color:var(--navy);display:block}
.quiz-result p{margin:4px 0 0;font-size:13px;color:#376B68}
.review-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:24px;margin-top:26px;align-items:start}
.fc-card,.check-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:26px 28px;box-shadow:var(--shadow)}
.fc-card h3,.check-card h3{font-family:var(--serif);font-size:21px;color:var(--navy);margin:0 0 4px}
.fc-card .sub,.check-card .sub{font-size:12.5px;color:var(--muted);margin:0}
.fc-wrap{perspective:1400px;margin:18px 0 16px}
.fc{position:relative;width:100%;min-height:340px;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.3,.7,.3,1);cursor:pointer}
.fc.flipped{transform:rotateY(180deg)}
.fc-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:16px;padding:28px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;overflow:hidden}
.fc-front{background:linear-gradient(150deg,#1F3B57,#235A58);color:#fff}
.fc-back{background:var(--cream);border:1px solid var(--line);transform:rotateY(180deg);align-items:flex-start;text-align:left}
.fc-front .w{font-family:var(--serif);font-size:34px;font-weight:700;line-height:1.2;word-break:break-word}
.fc-front .ph{font-family:var(--mono);font-size:12.5px;color:#9CCFCC;margin-top:9px}
.fc-front .pos{margin-top:12px;background:rgba(255,255,255,.12);color:#CFEDEA}
.fc-front .hint{position:absolute;bottom:18px;font-size:10.5px;color:rgba(255,255,255,.5);letter-spacing:.12em}
.fc-back .cn{font-size:22px;font-weight:700;color:var(--navy);line-height:1.4}
.fc-back .def{font-size:12.5px;color:var(--muted);margin-top:6px;line-height:1.6}
.fc-back .en{font-family:Georgia,serif;font-size:13.5px;color:#33404B;line-height:1.7;margin-top:12px;border-left:3px solid var(--teal);padding-left:11px}
.fc-back .en mark{background:transparent;color:var(--teal);font-weight:700}
.fc-controls{display:flex;align-items:center;gap:8px;justify-content:space-between;flex-wrap:wrap}
.fc-controls .counter{font-family:var(--mono);font-size:12px;color:var(--muted)}
.fc-controls .btn{padding:8px 14px;font-size:12.5px}
.check-list{list-style:none;margin:16px 0 0;padding:0;display:flex;flex-direction:column}
.check-list li label{display:flex;gap:12px;padding:10px 2px;font-size:13.5px;color:var(--body);cursor:pointer;border-bottom:1px dashed var(--line);align-items:flex-start;line-height:1.65}
.check-list li:last-child label{border-bottom:0}
.check-list input{appearance:none;-webkit-appearance:none;width:18px;height:18px;border:1.5px solid #C9D3D8;border-radius:6px;flex:none;margin-top:2px;position:relative;transition:.2s;background:#fff;cursor:pointer}
.check-list input:checked{background:var(--teal);border-color:var(--teal)}
.check-list input:checked::after{content:"";position:absolute;left:5px;top:1px;width:5px;height:9px;border:2px solid #fff;border-top:0;border-left:0;transform:rotate(42deg)}
.check-list li.done span{color:#9AA6AE;text-decoration:line-through}
.check-progress{display:flex;align-items:center;gap:12px;margin-top:16px}
.check-progress .bar{flex:1}
.check-progress b{font-family:var(--mono);font-size:12px;color:var(--teal)}

/* ---------- 页脚 / 提示 ---------- */
.footer{background:var(--navy-3);color:rgba(255,255,255,.64);padding:46px 0 38px;font-size:12.5px;line-height:1.9;border-top:4px solid var(--orange)}
.footer-in{display:grid;grid-template-columns:1.15fr .85fr;gap:34px}
.footer strong{color:#fff;font-family:var(--serif);font-size:17px;display:block;margin-bottom:10px;font-weight:700}
.footer p{margin:0 0 6px}
.footer .links{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.footer .links a{color:#8FC7C4;border-bottom:1px solid rgba(143,199,196,.35);padding-bottom:1px}
.toast{position:fixed;left:50%;bottom:30px;transform:translate(-50%,18px);background:var(--navy);color:#fff;padding:11px 24px;border-radius:999px;font-size:13px;box-shadow:0 14px 34px rgba(0,0,0,.28);opacity:0;pointer-events:none;transition:opacity .26s,transform .26s;z-index:300;max-width:86vw;text-align:center}
.toast.show{opacity:1;transform:translate(-50%,0)}
html.js .reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
html.js .reveal.in{opacity:1;transform:none}

@media(max-width:1040px){
  .hero-in{grid-template-columns:1fr;gap:44px}
  .hero-art{max-width:520px}
  .goals{grid-template-columns:repeat(2,1fr)}
  .concepts{grid-template-columns:1fr 1fr}
  .concepts .concept:last-child{grid-column:1/-1}
  .task-grid{grid-template-columns:1fr}
  .toolbox{position:static;max-height:none}
  .review-grid{grid-template-columns:1fr}
}
@media(max-width:860px){
  .nav-toggle{display:flex}
  .nav{position:absolute;top:72px;left:0;right:0;background:rgba(247,245,240,.99);flex-direction:column;padding:12px 5vw 18px;gap:4px;border-bottom:1px solid var(--line);display:none;box-shadow:0 16px 30px rgba(31,59,87,.1);margin:0}
  .nav.open{display:flex}
  .nav-link{padding:11px 16px;font-size:15px}
  .topbar-in{justify-content:space-between}
}
@media(max-width:720px){
  .section{padding:60px 0}
  .hero{padding:56px 0 64px}
  .hero-stats{gap:20px}
  .task-banner{grid-template-columns:1fr;padding:28px 24px;gap:18px}
  .concepts{grid-template-columns:1fr}
  .concepts .concept:last-child{grid-column:auto}
  .goals{grid-template-columns:1fr}
  .opts{grid-template-columns:1fr;margin-left:0}
  .why{margin-left:0}
  .reader{padding:22px 18px}
  .article p{font-size:16px;line-height:1.85;text-align:left}
  .popover{position:fixed;left:0;right:0;bottom:0;top:auto;width:auto;border-radius:20px 20px 0 0;transform:translateY(100%);max-height:84vh;overflow:auto;z-index:250}
  .popover.show{transform:none}
  .modal-grid .wordcard{grid-template-columns:1fr}
  .modal-grid .wordcard .wc-media{aspect-ratio:16/10;height:auto;min-height:0}
  .modal-grid .wordcard .wc-body{padding:22px}
  .footer-in{grid-template-columns:1fr}
  .tag-1{left:-4px}
  .tag-2{right:-4px}
  .editor-bar .btn-text{margin-left:0}
  .part{grid-template-columns:100px 1fr}
  .vgrid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
  .vcard .w{font-size:16.5px}
  .vcard .ph{font-size:10.5px}
  .vcard .cn{font-size:12px}
  .vcard-body{padding:10px 12px 12px}
  .vcard .cat{font-size:10px;padding-top:8px}
  .vcard .imgbox{aspect-ratio:16/10}
}
@media(max-width:420px){
  .brand-txt em{display:none}
  .hero h1{font-size:42px}
  .hero-cn{font-size:16px;letter-spacing:.2em}
  .tab{padding:9px 14px;font-size:12.5px}
  .fc-face{padding:20px}
  .fc-front .w{font-size:28px}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
}

/* ---------- 顶部任务栏 ---------- */
.lang-switch{display:flex;align-items:center;padding:3px;border-radius:999px;background:#EBE4D8;border:1px solid var(--line);flex:none;margin-left:auto}
.nav + .lang-switch{margin-left:12px}
.lang-switch span{padding:5px 10px;border-radius:999px;font-size:12px;font-weight:700;color:#6E7C88;cursor:pointer;transition:.2s;line-height:1.4}
.lang-switch span.on{background:var(--navy);color:#fff}
.taskbar{position:sticky;top:72px;z-index:75;background:rgba(255,253,249,.95);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line);box-shadow:0 8px 20px rgba(31,59,87,.05)}
.taskbar-in{display:flex;align-items:center;gap:14px;height:50px}
.tb-label{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);flex:none;display:flex;align-items:center;gap:7px}
.tb-label::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--orange)}
.tb-tabs{display:flex;gap:2px;overflow-x:auto;scrollbar-width:none;flex:1;min-width:0}
.tb-tabs::-webkit-scrollbar{display:none}
.tsk{padding:7px 13px;border-radius:9px;font-size:13.5px;color:#4A5A66;white-space:nowrap;display:flex;align-items:center;gap:7px;transition:background .2s,color .2s}
.tsk i{font-style:normal;font-family:var(--mono);font-size:10px;color:#A7B1B9;transition:color .2s}
.tsk:hover{background:rgba(46,139,137,.09);color:var(--navy)}
.tsk.active{background:var(--navy);color:#fff}
.tsk.active i{color:rgba(255,255,255,.62)}
.tb-right{display:flex;align-items:center;gap:10px;flex:none}
.tb-prog{width:84px;height:4px;border-radius:99px;background:#EAE3D7;overflow:hidden}
.tb-prog i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--teal),var(--orange));transition:width .18s linear}
.tb-top{font-size:12.5px;color:var(--muted);padding:6px 11px;border-radius:8px;border:1px solid var(--line);background:#fff;white-space:nowrap;transition:.2s}
.tb-top:hover{color:var(--teal);border-color:var(--teal)}

/* ---------- 好句精析 ---------- */
.sent-block{margin-top:38px}
.sent-head{max-width:960px;margin:0 auto}
.sent-head .eyebrow{margin:0 0 6px}
.sent-head h3{font-family:var(--serif);font-size:26px;color:var(--navy);margin:0}
.sent-head .sub{margin:6px 0 0;font-size:13px;color:var(--muted);line-height:1.8}
.sent-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:20px}
.sent-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px 22px;box-shadow:var(--shadow)}
.sent-q{font-family:Georgia,"Times New Roman",var(--serif);font-size:15.5px;line-height:1.72;color:var(--navy);margin:0 0 12px;padding-left:13px;border-left:3px solid var(--orange)}
.sent-q mark{background:linear-gradient(transparent 62%,rgba(217,131,36,.24) 62%);color:inherit}
.sent-tag{display:inline-block;font-size:11px;font-weight:700;color:#256B54;background:#DCEFE7;padding:3px 9px;border-radius:999px;margin-bottom:10px}
.sent-points{list-style:none;margin:0 0 10px;padding:0;display:flex;flex-direction:column;gap:6px}
.sent-points li{display:flex;gap:9px;font-size:13px;line-height:1.75;color:#45525E}
.sent-points b{flex:0 0 58px;font-size:10.5px;color:var(--teal);font-weight:700;letter-spacing:.04em;padding-top:2px}
.sent-zh{font-size:12.5px;color:var(--muted);line-height:1.75;margin:0 0 12px;padding-top:10px;border-top:1px dashed var(--line)}
.sent-zh b{color:var(--teal);font-size:10.5px;letter-spacing:.06em;margin-right:6px}
.sent-chunks{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}
.sent-chunks span{font-family:var(--mono);font-size:11.5px;background:var(--cream);border:1px solid var(--line);border-radius:6px;padding:3px 8px;color:#3F4D59}
.sent-chunks span i{font-style:normal;font-family:var(--sans);color:var(--muted);margin-left:5px}
.sent-pattern{font-size:12.5px;background:#F3F8F7;border-radius:10px;padding:9px 12px;color:#2F5C58;line-height:1.7}
.sent-pattern b{color:var(--teal);font-size:10.5px;letter-spacing:.06em;margin-right:6px}

/* ---------- 单词速练 ---------- */
.word-drill{margin-bottom:26px}
.wd-modes{display:flex;gap:8px;align-items:center;margin:16px 0 14px;flex-wrap:wrap}
.wd-mode{padding:7px 14px;border-radius:999px;border:1px solid var(--line);background:#fff;font-size:12.5px;color:#5A6873;font-weight:600;transition:.2s}
.wd-mode.active{background:var(--teal);color:#fff;border-color:var(--teal)}
.wd-new{margin-left:auto;font-size:12.5px;color:var(--muted);padding:7px 10px}
.wd-new:hover{color:var(--teal)}
.wd-meta{display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:12px;color:var(--muted);margin-bottom:8px;flex-wrap:wrap}
.wd-dots{display:flex;gap:4px}
.wd-dots i{width:15px;height:4px;border-radius:99px;background:#E7E0D4;transition:.2s}
.wd-dots i.on{background:var(--teal)}
.wd-dots i.ok{background:var(--green)}
.wd-dots i.no{background:var(--red)}
.wd-prompt{font-family:var(--serif);font-size:23px;line-height:1.4;color:var(--navy);margin:4px 0 0}
.wd-prompt small{display:block;font-family:var(--mono);font-size:12px;color:var(--muted);margin-top:5px;letter-spacing:.02em}
.wd-opts{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:16px 0 0}
.wd-opts .opt{margin:0;font-size:14px}
.wd-feed{font-size:13px;line-height:1.7;margin-top:12px;min-height:22px}
.wd-feed.ok{color:var(--green)}
.wd-feed.no{color:var(--red)}
.wd-foot{display:flex;justify-content:flex-end;gap:10px;margin-top:6px}
.wd-sum{background:var(--teal-soft);border-radius:12px;padding:16px 18px;font-size:13.5px;color:#2F5C58;line-height:1.8}
.wd-sum b{font-family:var(--serif);font-size:22px;color:var(--navy);margin-right:4px}

@media(max-width:1040px){
  .sent-grid{grid-template-columns:1fr}
}
@media(max-width:860px){
  .tb-label{display:none}
  .tb-prog{display:none}
}
@media(max-width:720px){
  .taskbar{top:72px}
  .taskbar-in{height:46px;gap:8px}
  .tsk{padding:6px 10px;font-size:12.5px}
  .tsk i{display:none}
  .tb-top{padding:5px 8px;font-size:11.5px}
  .sent-grid{gap:12px}
  .sent-card{padding:16px 18px}
  .sent-points li{flex-direction:column;gap:2px}
  .sent-points b{flex:none}
  .wd-opts{grid-template-columns:1fr}
  .wd-prompt{font-size:20px}
  .lang-switch span{padding:4px 9px;font-size:11.5px}
}

/* ---------- 课本 Task 精练 ---------- */
.lab-wrap{max-width:960px;margin:0 auto;display:flex;flex-direction:column;gap:18px}
.lab-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px 26px;box-shadow:var(--shadow)}
.lab-top{display:flex;align-items:center;gap:10px;margin-bottom:6px}
.lab-no{font-family:var(--mono);font-size:11px;font-weight:700;letter-spacing:.08em;color:#fff;background:var(--teal);padding:3px 9px;border-radius:6px;white-space:nowrap}
.lab-top h3{font-family:var(--serif);font-size:21px;color:var(--navy);margin:0}
.lab-card .sub{font-size:13px;color:var(--muted);margin:0 0 16px;line-height:1.8}
.model-guide{border:1px dashed var(--line);border-radius:12px;padding:12px 16px;background:#FCFAF6;margin-bottom:18px}
.model-guide summary{cursor:pointer;font-size:13px;color:var(--teal);font-weight:600;list-style:none}
.model-guide summary::-webkit-details-marker{display:none}
.model-guide summary::before{content:"▸ ";font-size:11px}
.model-guide[open] summary::before{content:"▾ "}
.guide-text{margin-top:12px;font-size:13.5px;line-height:1.85;color:#3B4954}
.guide-text h4{font-family:var(--serif);margin:0 0 10px;color:var(--navy);font-size:16px}
.guide-text p{margin:0 0 9px}
.guide-text b{display:block;color:var(--teal);font-size:10.5px;letter-spacing:.06em;text-transform:uppercase;margin-bottom:1px}
.rt-item{border-top:1px solid var(--line);padding-top:16px;margin-top:16px}
.rt-item:first-child{border-top:0;padding-top:0;margin-top:0}
.rt-q{font-size:14px;color:var(--navy);font-weight:600;margin:0 0 10px;line-height:1.7;display:flex;gap:9px}
.rt-q span{font-family:var(--mono);color:var(--muted);font-weight:400;flex:none}
.rt-opts{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.rt-opt{text-align:left;border:1px solid var(--line);border-radius:9px;padding:9px 11px;font-size:13px;background:#fff;color:#45525E;transition:.18s}
.rt-opt:hover:not(:disabled){border-color:var(--teal);color:var(--navy)}
.rt-opt:disabled{cursor:default}
.rt-opt.correct{background:#EAF6EE;border-color:#4C9A6A;color:#256B54;font-weight:600}
.rt-opt.wrong{background:#FBEDED;border-color:#C77;color:#9B3A3A}
.rt-why{font-size:12.5px;color:var(--muted);line-height:1.75;margin:10px 0 0;display:none}
.rt-why.show{display:block}
.lab-foot{margin-top:16px;padding-top:12px;border-top:1px dashed var(--line);font-size:12.5px;color:var(--muted)}
.lab-foot b{color:var(--navy);font-size:15px}
.bank{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 16px}
.bank span{font-family:var(--mono);font-size:12px;background:var(--cream);border:1px solid var(--line);border-radius:999px;padding:3px 10px;color:#45525E}
.cloze{display:flex;flex-direction:column;gap:11px}
.cloze p{font-size:14px;line-height:2;color:#3B4954;margin:0}
.cloze select{border:1px solid var(--line);border-radius:7px;padding:3px 7px;font-size:13px;background:#fff;color:var(--navy);font-family:var(--sans);min-width:108px;margin:0 2px;cursor:pointer}
.cloze select.ok{border-color:#4C9A6A;background:#EAF6EE;color:#256B54}
.cloze select.no{border-color:#C77;background:#FBEDED;color:#9B3A3A}
.lab-actions{display:flex;gap:10px;align-items:center;margin-top:16px;flex-wrap:wrap}
.lab-feed{font-size:12.5px;color:var(--muted)}
.rewrite{display:flex;flex-direction:column;gap:12px}
.rw{border:1px solid var(--line);border-radius:11px;padding:13px 15px}
.rw .raw{font-size:13.5px;color:#7A3B3B;margin:0 0 9px;line-height:1.7}
.rw .raw b{font-family:var(--mono);font-size:10px;color:#B34A4A;letter-spacing:.08em;margin-right:7px}
.rw details summary{cursor:pointer;font-size:12.5px;color:var(--teal);font-weight:600;list-style:none}
.rw details summary::-webkit-details-marker{display:none}
.rw details summary::before{content:"▸ ";font-size:11px}
.rw details[open] summary::before{content:"▾ "}
.rw .ref{font-size:13.5px;color:#256B54;background:#EFF8F1;border-radius:8px;padding:10px 13px;margin:9px 0 0;line-height:1.7}
.rw .note{font-size:12px;color:var(--muted);margin:7px 0 0;line-height:1.75}
.ex-answers{margin-top:16px;padding-top:14px;border-top:1px dashed var(--line);display:grid;grid-template-columns:1fr 1fr;gap:10px 22px}
.ex-answers[hidden]{display:none}
.ex-ans{margin:0;font-size:12.5px;line-height:1.75;color:#45525E}
.ex-ans b{display:block;font-family:var(--mono);font-size:11.5px;color:var(--teal);letter-spacing:.02em;margin-bottom:2px}
.ex-ans span{display:block;color:var(--muted);font-size:12px}
.ex-ans-head{grid-column:1/-1;font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--teal);font-weight:700}
@media(max-width:720px){
  .lab-card{padding:18px}
  .rt-opts{grid-template-columns:1fr}
  .lab-top h3{font-size:19px}
  .ex-answers{grid-template-columns:1fr}
}

/* ---------- 课本练习合集 ---------- */
.ex-nav{max-width:960px;margin:0 auto 18px;display:flex;flex-wrap:wrap;gap:7px}
.ex-nav a{font-size:12px;padding:5px 11px;border:1px solid var(--line);border-radius:999px;background:#fff;color:#45525E;text-decoration:none;transition:.18s}
.ex-nav a:hover{border-color:var(--teal);color:var(--teal)}
.ex-list{margin-top:4px}
.ex-line{font-size:14px;line-height:2.15;color:#3B4954;margin:0 0 10px}
.ex-n{font-family:var(--mono);font-size:12px;color:var(--orange);margin-right:8px}
.ex-input{border:1px solid var(--line);border-radius:6px;padding:3px 8px;font-size:13.5px;background:#fff;color:var(--navy);min-width:130px;max-width:230px;font-family:var(--sans);margin:0 2px}
.ex-input:focus{outline:none;border-color:var(--teal)}
.ex-input.ok{border-color:#4C9A6A;background:#EAF6EE;color:#256B54}
.ex-input.no{border-color:#C77;background:#FBEDED;color:#9B3A3A}
.collo-box{border:1px solid var(--line);border-radius:10px;background:#FCFAF6;padding:12px 15px;font-size:13px;line-height:1.95;color:#45525E;margin-bottom:16px}
.collo-box b{color:var(--teal);font-family:var(--mono);font-size:12px}
.ex-paras p{font-size:14px;line-height:2.15;color:#3B4954;margin:0 0 12px}
.write-item{border-top:1px dashed var(--line);padding-top:14px;margin-top:14px}
.write-item:first-child{border-top:0;padding-top:0;margin-top:0}
.write-pair{font-size:13.5px;color:#3B4954;line-height:1.8;margin:0 0 5px}
.write-pair b{font-family:var(--mono);font-size:11px;color:var(--muted);margin-right:7px;min-width:14px;display:inline-block}
.ex-area{width:100%;min-height:84px;border:1px solid var(--line);border-radius:9px;padding:9px 11px;font-family:var(--sans);font-size:13.5px;line-height:1.7;background:#fff;color:var(--navy);resize:vertical;margin-top:8px}
.ex-area:focus{outline:none;border-color:var(--teal)}
.model summary{margin-top:9px;cursor:pointer;font-size:12.5px;color:var(--teal);font-weight:600;list-style:none}
.model summary::-webkit-details-marker{display:none}
.model summary::before{content:"▸ ";font-size:11px}
.model[open] summary::before{content:"▾ "}
.model .ref{font-size:13.5px;color:#256B54;background:#EFF8F1;border-radius:8px;padding:10px 13px;margin:8px 0 0;line-height:1.75}
.model .note{font-size:12px;color:var(--muted);margin:6px 0 0;line-height:1.75}
.trans-prompt{border-left:3px solid var(--orange);background:#FCFAF6;border-radius:8px;padding:12px 15px;font-size:13.5px;line-height:1.95;color:#3B4954;margin-bottom:12px}
.given{font-family:var(--mono);font-size:11.5px;color:var(--teal);margin-top:8px;letter-spacing:.02em}
@media(max-width:720px){
  .ex-input{min-width:110px;max-width:none}
  .ex-nav a{font-size:11.5px;padding:4px 9px}
}

/* ---------- 翻译前分步训练 ---------- */
.tp{border:1px solid var(--line);background:#FCFAF6;border-radius:14px;padding:16px 18px;margin:16px 0 18px}
.tp-kicker{font-family:var(--mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:var(--teal);margin:0 0 4px}
.tp-titlerow{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap}
.tp-titlerow h4{font-family:var(--serif);font-size:18px;color:var(--navy);margin:0}
.tp-count{font-size:12px;color:var(--muted)}
.tp-count b{color:var(--teal);font-size:15px}
.tp-bar{height:3px;background:#E7E1D5;border-radius:99px;margin:10px 0 12px;overflow:hidden}
.tp-bar i{display:block;height:100%;background:var(--teal);transition:width .25s}
.tp-tabs{display:flex;flex-wrap:wrap;gap:6px}
.tp-tab{font-size:11px;border:1px solid var(--line);background:#fff;color:#5A6672;border-radius:999px;padding:4px 9px;cursor:pointer;font-family:var(--sans)}
.tp-tab.on{background:var(--navy);border-color:var(--navy);color:#fff}
.tp-tab.done{border-color:var(--teal);color:var(--teal)}
.tp-tab.done.on{color:#fff}
.tp-body{margin-top:14px;border-top:1px dashed var(--line);padding-top:14px}
.tp-step-title{font-size:15px;color:var(--navy);margin:0 0 4px;font-weight:600}
.tp-sub{font-size:12px;color:var(--muted);line-height:1.8;margin:0 0 12px}
.tp-list{display:flex;flex-direction:column;gap:9px}
.tp-line{font-size:13.5px;line-height:2;color:#3B4954;margin:0}
.tp-n{display:inline-block;min-width:18px;font-family:var(--mono);font-size:11px;color:var(--orange);margin-right:6px}
.tp-arrow{color:var(--muted);margin:0 4px}
.tp-select,.tp-input{border:1px solid var(--line);border-radius:6px;padding:3px 7px;font-size:13px;background:#fff;color:var(--navy);font-family:var(--sans);margin:0 3px}
.tp-select{min-width:150px;cursor:pointer}
.tp-input{min-width:120px}
.tp-select.tp-ok,.tp-input.tp-ok{border-color:#4C9A6A;background:#EAF6EE;color:#256B54}
.tp-select.tp-no,.tp-input.tp-no{border-color:#C77;background:#FBEDED;color:#9B3A3A}
.tp-item{border-top:1px dashed var(--line);padding-top:12px;margin-top:12px}
.tp-item:first-child{border-top:0;padding-top:0;margin-top:0}
.tp-zh{font-size:13.5px;color:var(--navy);margin:0 0 4px;font-weight:600;line-height:1.7}
.tp-src{font-size:13.5px;color:var(--navy);margin:0 0 6px;line-height:1.8}
.tp-key{font-family:var(--mono);font-size:11px;color:var(--teal);line-height:1.7;margin:0 0 4px;background:#F1F6F4;border-radius:6px;padding:5px 8px;word-break:break-word}
.tp-pattern{font-size:11.5px;color:var(--muted);margin:0 0 4px;line-height:1.7}
.tp-area{width:100%;min-height:64px;border:1px solid var(--line);border-radius:8px;padding:8px 10px;font-family:var(--sans);font-size:13px;line-height:1.7;color:var(--navy);background:#fff;resize:vertical}
.tp-area:focus{outline:none;border-color:var(--teal)}
.tp-model summary{margin-top:7px;cursor:pointer;font-size:12px;color:var(--teal);font-weight:600;list-style:none}
.tp-model summary::-webkit-details-marker{display:none}
.tp-model summary::before{content:"▸ ";font-size:10px}
.tp-model[open] summary::before{content:"▾ "}
.tp-ref{font-size:13px;color:#256B54;background:#EFF8F1;border-radius:8px;padding:9px 12px;margin:7px 0 0;line-height:1.75}
.tp-note{font-size:11.5px;color:var(--muted);margin:5px 0 0;line-height:1.7}
.tp-hint{font-size:12px;color:#7A5A2E;background:#FBF3E4;border-left:3px solid var(--orange);border-radius:6px;padding:8px 11px;line-height:1.75;margin:12px 0 0}
.tp-ans{margin-top:12px}
.tp-ans summary{cursor:pointer;font-size:12px;color:var(--teal);font-weight:600;list-style:none}
.tp-ans summary::-webkit-details-marker{display:none}
.tp-ans summary::before{content:"▸ "}
.tp-ans[open] summary::before{content:"▾ "}
.tp-ans-body{margin-top:8px;display:grid;grid-template-columns:1fr 1fr;gap:6px 16px}
.tp-ans-body p{font-size:11.5px;color:var(--muted);margin:0;line-height:1.7}
.tp-ans-body b{display:block;color:var(--navy);font-size:12px}
.tp-actions{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:14px;padding-top:12px;border-top:1px solid var(--line)}
.tp-actions .btn[disabled]{opacity:.45;cursor:default}
.tp-feed{font-size:11.5px;color:var(--muted);line-height:1.6;flex:1;min-width:160px}
.tp-done{list-style:none;padding:0;margin:0 0 14px;display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:7px}
.tp-done li{display:flex;align-items:center;gap:7px;font-size:12px;color:var(--muted);border:1px solid var(--line);background:#fff;border-radius:8px;padding:7px 10px}
.tp-done li b{font-family:var(--mono);font-size:10px;color:var(--muted)}
.tp-done li.on{border-color:#9CCFB0;background:#F0F8F2;color:#256B54}
.tp-done li.on b{color:#256B54}
.tp-done li em{margin-left:auto;font-style:normal;font-size:10.5px;color:inherit;opacity:.8}
.tp-recap{border:1px dashed var(--line);border-radius:10px;padding:11px 14px;margin-bottom:12px;background:#fff}
.tp-recap-h{font-size:12px;color:var(--navy);font-weight:600;margin:0 0 6px}
.tp-recap p{font-size:12px;color:#45525E;margin:0 0 3px;line-height:1.7}
.tp-recap b{font-family:var(--mono);font-size:11.5px;color:var(--teal);margin-right:5px}
.tp-flash{box-shadow:0 0 0 3px rgba(46,139,137,.35)}
@media(max-width:720px){.tp{padding:14px}.tp-ans-body{grid-template-columns:1fr}.tp-feed{min-width:100%}}