:root{--navy:#0b2c67;--blue:#2674f2;--blue2:#6aaaff;--pink:#e94d85;--ink:#18335f;--muted:#72829e;--line:rgba(50,98,177,.14);--paper:#fff;--bg:#f5f8ff;--green:#15956f;--shadow:0 14px 38px rgba(46,88,157,.12)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;background:radial-gradient(circle at 90% 3%,rgba(104,169,255,.22),transparent 28%),linear-gradient(180deg,#f2f7ff 0,#fff 44%,#f7fbff 100%);min-height:100vh}button,input,select{font:inherit}button,a{ -webkit-tap-highlight-color:transparent}a{text-decoration:none;color:inherit}.topbar{padding:24px 18px 58px;color:#fff;background:linear-gradient(135deg,#0e4fc4,#2c7ef5 58%,#79b9ff);border-radius:0 0 34px 34px}.topbar-inner{width:min(1180px,100%);margin:auto}.top-actions{display:flex;gap:10px;flex-wrap:wrap}.pill-link,.ghost-btn{display:inline-flex;align-items:center;gap:7px;padding:10px 14px;border:1px solid rgba(255,255,255,.35);border-radius:999px;background:rgba(255,255,255,.13);color:#fff}.hero-row{display:flex;align-items:center;gap:16px;margin-top:25px}.hero-icon{display:grid;place-items:center;width:68px;height:68px;border-radius:22px;background:rgba(255,255,255,.17);font-size:34px;box-shadow:inset 0 0 0 1px rgba(255,255,255,.22)}h1{margin:0;font-size:clamp(28px,5vw,46px)}.subtitle{margin:8px 0 0;color:rgba(255,255,255,.9);line-height:1.7}.page{width:min(calc(100% - 24px),1180px);margin:-34px auto 0;padding-bottom:60px;position:relative}.panel{background:rgba(255,255,255,.96);border:1px solid rgba(255,255,255,.8);border-radius:22px;box-shadow:var(--shadow)}.chapter-nav{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:12px 16px;margin-bottom:14px}.chapter-nav a{color:var(--blue);font-weight:700}.chapter-nav a:last-child{text-align:right}.chapter-nav .center{font-size:13px;color:var(--muted)}.tabs{display:flex;gap:8px;padding:9px;margin-bottom:14px;overflow:auto}.tab-btn{border:0;border-radius:14px;padding:11px 17px;background:#f0f5ff;color:#587095;font-weight:750;white-space:nowrap;cursor:pointer}.tab-btn.active{color:#fff;background:linear-gradient(135deg,var(--blue),var(--blue2));box-shadow:0 8px 18px rgba(38,116,242,.22)}.tab-panel{display:none}.tab-panel.active{display:block}.loading{padding:36px;text-align:center;color:var(--muted)}.study-shell{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(330px,.65fr);gap:16px;align-items:start}.story-card{overflow:hidden}.study-toolbar{padding:14px;border-bottom:1px solid var(--line);background:#fbfdff}.pager{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:8px;margin-bottom:10px}.pager button{min-height:40px;border:1px solid var(--line);border-radius:11px;background:#fff;color:var(--blue);cursor:pointer}.pager button:disabled{color:#b8c0ce;background:#f7f8fb}.pager button:last-child{text-align:center}.pager-status{color:#7d3eb5;font-weight:800}.tool-row{display:flex;gap:7px;flex-wrap:wrap;align-items:center}.tool-btn{border:1px solid var(--line);border-radius:999px;padding:8px 12px;background:#fff;color:#435b7f;cursor:pointer}.tool-btn.active{color:#fff;border-color:transparent;background:linear-gradient(135deg,#7049ed,#9b70ff)}.font-readout{color:var(--muted);font-size:13px}.story-content{padding:24px 28px;font-family:"Noto Serif SC","Songti SC",serif;font-size:20px;line-height:2.08;min-height:620px}.story-content p{margin:0 0 1.45em;text-indent:2em}.story-text{transition:opacity .2s}.story-word{display:inline;border:0;border-radius:5px;padding:1px 5px;margin:0 1px;background:#ffd0df;color:#d82f68;font:inherit;font-weight:700;cursor:pointer;box-decoration-break:clone;-webkit-box-decoration-break:clone}.story-word:hover,.story-word.active{color:#fff;background:linear-gradient(135deg,#ef4c87,#ff79a8);box-shadow:0 4px 12px rgba(233,77,133,.25)}.story-gloss{font-size:.9em;color:#344e77}.review-mode .story-gloss{display:inline-block;min-width:4em;color:transparent;border-bottom:1px dashed #90a0ba;user-select:none}.review-mode.show-answers .story-gloss{color:#344e77;border-bottom-color:transparent}.hide-chinese .story-text,.hide-chinese .story-gloss{opacity:.06}.hide-english .story-word{opacity:.06}.word-side{position:sticky;top:10px;max-height:calc(100vh - 20px);overflow:auto;padding:12px}.side-head{display:flex;justify-content:space-between;gap:10px;align-items:center;padding:4px 4px 10px}.side-head h2{margin:0;font-size:18px}.side-head span{color:var(--muted);font-size:13px}.word-card{scroll-margin-top:18px;margin-bottom:10px;padding:14px;border:1px solid rgba(38,116,242,.09);border-radius:17px;background:linear-gradient(135deg,#effcf7,#e6f8ff);transition:.2s}.word-card:nth-child(even){background:linear-gradient(135deg,#fff4e7,#ffeef5)}.word-card.selected{border-color:#7c56ed;box-shadow:0 0 0 3px rgba(124,86,237,.12),0 10px 24px rgba(70,76,155,.14);transform:translateY(-2px)}.word-title{display:grid;grid-template-columns:32px 1fr auto;gap:9px;align-items:start}.speaker-btn,.save-mini{display:grid;place-items:center;width:32px;height:32px;border:0;border-radius:50%;background:rgba(255,255,255,.85);cursor:pointer}.speaker-btn svg{width:16px;height:16px;fill:#6c7d98}.word-name{font-size:17px;font-weight:850;color:#173e82}.ipa{margin-top:3px;color:#7e759b;font-family:Georgia,serif;font-size:13px}.save-mini{color:#188a68;font-size:20px;background:rgba(255,255,255,.66)}.word-meta{margin:9px 0 0 41px;font-size:14px;line-height:1.65;color:#52637e}.pos{color:#7a4cc5;font-weight:800;margin-right:7px}.en-def{margin-top:7px;color:#6d7890;font-size:13px}.example-box{margin-top:8px;padding:9px 10px;border-radius:11px;background:rgba(255,255,255,.68);font-size:13px;line-height:1.55}.context-box{margin-top:6px;color:#65758f;font-size:12px}.section-card{padding:18px}.section-head,.toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}.section-head h2,.section-head h3{margin:0}.searchbox{width:min(420px,100%);min-height:44px;border:1px solid var(--line);border-radius:13px;padding:0 13px;outline:none;background:#f8fbff}.count-badge{display:inline-flex;padding:7px 10px;border-radius:999px;background:#edf4ff;color:var(--blue);font-size:13px;font-weight:750}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:15px}.vocab-table{width:100%;border-collapse:collapse;min-width:820px}.vocab-table th,.vocab-table td{padding:12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.vocab-table th{position:sticky;top:0;background:#edf4ff;color:#234a84}.vocab-table tr:last-child td{border-bottom:0}.vocab-word{color:var(--blue);font-weight:800;cursor:pointer}.mini-actions{display:flex;gap:6px}.mini-btn{border:1px solid var(--line);border-radius:9px;background:#fff;padding:6px 8px;cursor:pointer}.mnemonic-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.mnemonic-card{padding:15px;border:1px solid var(--line);border-radius:15px;background:#fbfdff}.mnemonic-card strong{color:#174a95}.mnemonic-card p{margin:8px 0 0;color:#60718d;line-height:1.65}.footer{padding:20px;color:#8a98ae;text-align:center;font-size:13px}.toast{position:fixed;left:50%;bottom:24px;z-index:100;transform:translate(-50%,20px);padding:11px 17px;border-radius:999px;background:#162d55;color:#fff;opacity:0;pointer-events:none;transition:.2s}.toast.show{opacity:1;transform:translate(-50%,0)}
/* directory and quiz */
.directory-main{width:min(calc(100% - 28px),1080px);margin:-43px auto 0;padding-bottom:60px;position:relative}.directory-toolbar{padding:20px}.directory-actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:14px}.primary-action{border:0;border-radius:14px;padding:12px 16px;color:#fff;background:linear-gradient(135deg,var(--blue),var(--blue2));font-weight:800;cursor:pointer;box-shadow:0 8px 18px rgba(38,116,242,.2)}.secondary-action{border:1px solid var(--line);border-radius:14px;padding:12px 16px;color:#3e5f91;background:#fff;font-weight:750;cursor:pointer}.quiz-drawer{display:none;margin-top:14px;padding:18px;border:1px solid var(--line);border-radius:18px;background:#f8fbff}.quiz-drawer.open{display:block}.setup-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.field label{display:block;margin-bottom:6px;color:#536889;font-size:13px;font-weight:750}.field select{width:100%;min-height:44px;border:1px solid var(--line);border-radius:12px;padding:0 10px;background:#fff}.chapter-picks{display:grid;grid-template-columns:repeat(10,1fr);gap:7px;margin-top:14px}.chapter-picks label{display:flex;justify-content:center;align-items:center;min-height:37px;border:1px solid var(--line);border-radius:10px;background:#fff;color:#52709e;cursor:pointer}.chapter-picks input{display:none}.chapter-picks label:has(input:checked){color:#fff;border-color:transparent;background:linear-gradient(135deg,#6d50ea,#9b7aff)}.chapter-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px;margin-top:20px}.chapter-card-link{display:grid;grid-template-columns:56px 1fr 24px;gap:13px;align-items:center;padding:17px;border:1px solid var(--line);border-radius:20px;background:rgba(255,255,255,.96);box-shadow:0 8px 24px rgba(46,88,157,.08);transition:.2s}.chapter-card-link:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(46,88,157,.13)}.chapter-num{display:grid;place-items:center;width:56px;height:56px;border-radius:17px;color:#fff;background:linear-gradient(135deg,var(--blue),var(--blue2));font-weight:850}.chapter-card-link:nth-child(4n+2) .chapter-num{background:linear-gradient(135deg,#7655e9,#a18dff)}.chapter-card-link:nth-child(4n+3) .chapter-num{background:linear-gradient(135deg,#0c9d91,#55d0be)}.chapter-card-link:nth-child(4n+4) .chapter-num{background:linear-gradient(135deg,#e89025,#ffc15e)}.chapter-info strong{display:block;color:var(--navy)}.chapter-info small{display:block;margin-top:6px;color:#63738e}.arrow{font-size:30px;color:var(--blue)}
.quiz-wrap{width:min(calc(100% - 24px),900px);margin:-34px auto 0;padding-bottom:60px;position:relative}.quiz-card{padding:22px}.quiz-progress{display:flex;justify-content:space-between;color:var(--muted);font-size:14px}.progress-bar{height:8px;margin:10px 0 22px;border-radius:999px;background:#e9eff9;overflow:hidden}.progress-bar span{display:block;height:100%;background:linear-gradient(90deg,var(--blue),#8a72ff)}.question-type{display:inline-flex;padding:6px 10px;border-radius:999px;background:#eef4ff;color:var(--blue);font-size:13px;font-weight:800}.question-text{margin:14px 0 18px;font-size:clamp(20px,4vw,27px);line-height:1.55}.option-list{display:grid;gap:10px}.option{display:flex;gap:11px;align-items:flex-start;padding:14px;border:1px solid var(--line);border-radius:14px;background:#fff;cursor:pointer}.option:hover{border-color:rgba(38,116,242,.4)}.option input{margin-top:4px}.quiz-nav{display:flex;justify-content:space-between;gap:10px;margin-top:20px}.result-score{text-align:center;padding:12px 0 22px}.score-circle{display:grid;place-items:center;width:120px;height:120px;margin:auto;border-radius:50%;background:linear-gradient(135deg,#eef5ff,#fff);box-shadow:inset 0 0 0 9px #dceaff;color:var(--blue);font-size:30px;font-weight:900}.result-list{display:grid;gap:11px}.result-item{padding:15px;border:1px solid #ffd3dd;border-radius:15px;background:#fff7f9}.result-item.correct{border-color:#cdeede;background:#f5fffa}.result-meta{margin-top:8px;color:#697b96;font-size:13px}.answer-line{margin-top:7px}.book-page{width:min(calc(100% - 24px),1050px);margin:-34px auto 0;padding-bottom:60px;position:relative}.book-card{padding:18px}.book-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}.book-item{padding:15px;border:1px solid var(--line);border-radius:16px;background:#fff}.book-item-head{display:flex;justify-content:space-between;gap:10px}.book-item h3{margin:0;color:#174a95}.book-item p{margin:7px 0 0;color:#60718d;line-height:1.6}.empty-state{padding:42px;text-align:center;color:var(--muted)}
@media(max-width:860px){.study-shell{grid-template-columns:1fr}.word-side{position:relative;top:auto;max-height:none}.story-content{min-height:0}.chapter-picks{grid-template-columns:repeat(5,1fr)}.book-list{grid-template-columns:1fr}}
@media(max-width:680px){.topbar{padding:18px 14px 50px;border-radius:0 0 26px 26px}.hero-row{align-items:flex-start}.hero-icon{width:58px;height:58px;border-radius:18px;font-size:28px}.page,.quiz-wrap,.book-page{width:min(calc(100% - 14px),1180px);margin-top:-30px}.panel{border-radius:17px}.chapter-nav{padding:10px 11px}.chapter-nav .label{display:none}.tabs{border-radius:17px}.story-content{padding:19px 17px;font-size:18px;line-height:1.95}.word-side{padding:9px}.section-card{padding:13px}.mnemonic-grid{grid-template-columns:1fr}.directory-main{width:min(calc(100% - 14px),1080px)}.chapter-grid{grid-template-columns:1fr}.setup-row{grid-template-columns:1fr}.chapter-picks{grid-template-columns:repeat(5,1fr)}.quiz-card{padding:17px}.book-card{padding:13px}}

/* v4 refinements */
.word-meta{margin-top:10px;margin-left:41px;padding-top:8px;border-top:1px dashed rgba(89,111,150,.18);font-size:14px;line-height:1.72;color:#52637e}.analysis-box{margin-top:10px;padding:11px 12px;border-radius:12px;background:#f0f6ff;color:#425b80;line-height:1.7}.result-item .directory-actions{margin-top:12px}.quiz-card .option input{accent-color:#2674f2}.quiz-card button:disabled{opacity:.55;cursor:not-allowed}@media(max-width:920px){.word-side{position:static;max-height:none}.word-card{scroll-margin-top:88px}}

/* IELTS accent */
body{--accent:#4867e8}.topbar{background:linear-gradient(135deg,#334fc8,#7598ff)}

/* v5: rich meanings, source-based review table, listening and handwriting */
.word-main{min-width:0}.word-pos-line{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.meaning-label{font-size:12px;color:#7b8ca8}.sense-list{margin:8px 0 0;padding-left:20px;display:grid;gap:4px;color:#52637e}.sense-list li::marker{color:#4c79df}.review-note{margin-bottom:12px;padding:13px 15px;border-radius:14px;background:#f1f6ff;color:#526985;line-height:1.65}.review-table-wrap{overflow:auto;border:1px solid var(--line);border-radius:16px}.review-table{width:100%;min-width:980px;border-collapse:collapse;background:#fff}.review-table th,.review-table td{padding:10px;border:1px solid rgba(55,98,170,.14);vertical-align:middle}.review-table th{position:sticky;top:0;z-index:2;background:#eaf2ff;color:#254f92}.review-table tbody tr:nth-child(even){background:#f8fbff}.review-word{border:0;background:transparent;color:#174a95;font-weight:800;cursor:pointer}.review-check input{position:absolute;opacity:0}.review-check span{display:grid;place-items:center;width:30px;height:30px;margin:auto;border:1px solid #ccd9ed;border-radius:9px;color:transparent;background:#fff;cursor:pointer}.review-check input:checked+span{color:#fff;background:#2f75e8;border-color:#2f75e8}.question-media{display:flex;align-items:center;gap:10px;margin-bottom:15px}.listen-button{border:0;border-radius:999px;padding:13px 19px;color:#fff;background:linear-gradient(135deg,#5e53dd,#8f83ff);font-weight:850;cursor:pointer;box-shadow:0 8px 18px rgba(86,74,210,.2)}.listen-hint,.input-tip{color:var(--muted);font-size:13px}.text-answer-wrap{margin-top:8px;padding:16px;border:1px solid var(--line);border-radius:16px;background:#f8fbff}.answer-mode-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:13px}.answer-label{display:grid;gap:8px;color:#40577c;font-weight:750}.dictation-input{width:100%;padding:14px 15px;border:1px solid #cfdced;border-radius:13px;font-size:20px;outline:none}.dictation-input:focus{border-color:#4779ef;box-shadow:0 0 0 4px rgba(71,121,239,.1)}.handwriting-canvas{width:100%;height:220px;border:2px dashed #b8c8e4;border-radius:15px;background:repeating-linear-gradient(0deg,#fff,#fff 43px,#eaf0fa 44px);touch-action:none}.feature-link{border-color:rgba(91,105,229,.28);color:#4e55c2}.book-card .directory-actions:after{content:"导出的 Excel 含表格线、隔行底色和打印页面设置";align-self:center;color:var(--muted);font-size:12px}
@media(max-width:680px){.handwriting-canvas{height:180px}.dictation-input{font-size:18px}.review-table{min-width:900px}}

/* v6: one-line meanings, mnemonic cards and unified copyright */
.sense-inline{margin-top:7px;max-width:100%;overflow-x:auto;white-space:nowrap;color:#52637e;line-height:1.65;scrollbar-width:thin;padding-bottom:2px}
.sense-sep{color:#94a3ba}
.mnemonic-head{display:flex;align-items:center;gap:8px;min-width:0}
.mnemonic-head strong{min-width:0;overflow-wrap:anywhere}
.mnemonic-head .pos{margin-left:auto;flex:0 0 auto}
.mnemonic-meaning{font-weight:750;color:#38577f!important}
.footer{white-space:nowrap;overflow-x:auto;padding-left:8px;padding-right:8px;font-size:clamp(9px,2.5vw,13px);scrollbar-width:none}
.footer::-webkit-scrollbar{display:none}

/* v7 directory navigation */
.directory-top-actions{margin-bottom:4px}.directory-top-actions .pill-link{font-weight:750}
@media(max-width:520px){.directory-top-actions{gap:7px}.directory-top-actions .pill-link{padding:8px 10px;font-size:13px}}



/* GRE edition */
body{--accent:#0f766e}.topbar{background:linear-gradient(135deg,#064e62,#0f766e 58%,#5cc8b8)}
.chapter-nav .disabled{color:#9eb4b1;pointer-events:none}.chapter-nav .center{font-weight:850}
@media(max-width:520px){.subtitle br{display:none}}

/* v17: unified mnemonic typography */
.mnemonic-head{display:flex;align-items:flex-start;gap:8px;min-width:0}
.mnemonic-wordline{display:flex;align-items:baseline;gap:9px;flex:1;min-width:0;flex-wrap:wrap}
.mnemonic-wordline strong{min-width:0;overflow-wrap:anywhere}
.mnemonic-ipa{color:#6f7e98;font-family:Georgia,"Times New Roman",serif;font-size:13px;font-weight:650;letter-spacing:.01em;white-space:nowrap}
.mnemonic-definition-line{display:flex;align-items:flex-start;gap:9px;margin-top:8px;line-height:1.65}
.mnemonic-definition-line .pos{flex:0 0 auto;margin:0}
.mnemonic-definition-line .mnemonic-meaning{margin:0;color:#38577f;font-weight:750;overflow-wrap:anywhere}
.mnemonic-note{margin-top:8px!important}
@media(max-width:520px){.mnemonic-card{padding:13px}.mnemonic-head{gap:7px}.mnemonic-wordline{gap:6px}.mnemonic-ipa{font-size:12px}.mnemonic-definition-line{gap:7px}}

.word-meaning-inline{display:flex;align-items:baseline;gap:7px;flex-wrap:wrap;min-width:0}.word-meaning-inline .pos{flex:0 0 auto;margin-right:0}.word-meaning-inline .sense-inline{display:inline;margin:0;white-space:normal;overflow:visible;padding:0;min-width:0;flex:1 1 160px}.sense-sep{color:#9aa8bb}