:root{color-scheme:light;--bg:#f7f8fb;--paper:#fff;--ink:#1b2638;--muted:#748092;--border:#e9edf3;--line:#e6e9f1;--primary:#4665d3;--primary-soft:#eef1ff;--sidebar:#101a2e;--shut:#18243a;--shadow:0 12px 35px rgba(20,38,78,.042);--radius:18px;--math:#4a62c8}
[data-theme=dark]{color-scheme:dark;--bg:#101620;--paper:#18212e;--ink:#e5eaf4;--muted:#9aabc3;--border:#293649;--line:#344056;--primary:#94a8ff;--primary-soft:#28324e;--sidebar:#0d1421;--shut:#162032;--shadow:0 12px 40px rgba(0,0,0,.12);--math:#b0bdff}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.6 -apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;-webkit-tap-highlight-color:transparent}button,input,textarea{font:inherit}button{cursor:pointer}button:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid #8c9eff;outline-offset:2px}button:disabled{opacity:.48;cursor:not-allowed}svg{width:19px;height:19px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}h1,h2,h3,p{margin-top:0}.app{min-height:100vh}.sidebar{z-index:60;position:fixed;top:0;left:0;bottom:0;overflow-y:auto;width:276px;background:var(--sidebar);color:#eaf0fb;display:flex;flex-direction:column;scrollbar-width:thin;scrollbar-color:#37455d transparent}.brand{height:98px;flex-shrink:0;display:flex;align-items:center;gap:12px;padding:0 24px}.brand-icon{width:43px;height:43px;display:grid;place-items:center;border-radius:13px;background:#e9edff;color:#263b83;font-weight:900;font-size:23px;font-family:serif}.brand strong{font-weight:800;font-size:21px;letter-spacing:.12em;display:block;line-height:1.2}.brand small{font-size:9px;letter-spacing:.23em;color:#95a3bc}.sidebar-head{font-size:11px;color:#7789a4;letter-spacing:.08em;padding:25px 25px 8px;border-top:1px solid #263249;display:flex;justify-content:space-between}.sidebar-head span{font-size:10px;letter-spacing:0}.navgroup{padding:11px 14px 6px}.navsubject{display:flex;align-items:center;gap:8px;font-weight:700;color:#cad5e8;font-size:13px;padding:7px 11px}.navdot{width:8px;height:8px;border-radius:50%;background:var(--subject-color)}.navbook{width:100%;text-align:left;padding:10px 11px 10px 23px;border:0;border-radius:10px;display:flex;align-items:center;justify-content:space-between;gap:6px;color:#99a9c3;background:transparent;font-size:12px;transition:.18s}.navbook:hover{color:white;background:#202e46}.navbook.active{background:#253554;color:white;font-weight:650}.navbook b{font-size:10px;font-weight:500;opacity:.65}.sidebar-bottom{margin-top:auto;padding:25px 20px 20px;border-top:1px solid #263249}.tiny-quote{font-size:11px;color:#7d90ad;margin:0 3px 15px}.sidebar-action{background:transparent;color:#a6b7d1;border:0;width:100%;display:flex;align-items:center;gap:9px;padding:8px 4px;text-align:left;font-size:12px}.sidebar-action:hover{color:white}.sidebar-action svg{width:15px;height:15px}.local-msg{display:block;font-size:10px;color:#677c9a;padding:8px 4px}.main{margin-left:276px;min-width:0}.topbar{height:76px;background:var(--paper);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 clamp(20px,5vw,73px);justify-content:space-between;gap:12px}.topbread{font-size:13px;font-weight:650;color:var(--ink)}.crumbslash{color:#afb5c4;margin:0 7px}.top-actions{display:flex;align-items:center;gap:13px}.edition{color:var(--muted);font-size:11px}.icon-btn{width:37px;height:37px;border:1px solid var(--border);background:var(--paper);border-radius:11px;color:var(--muted);display:grid;place-items:center}.icon-btn:hover{color:var(--primary);border-color:var(--primary)}.mobile-menu,.mobile-close{display:none}.page{padding:0 clamp(20px,5vw,70px);max-width:1650px;margin:auto}.hero{padding:54px 0 34px;position:relative}.overline,.eyebrow{font-size:11px;letter-spacing:.15em;font-weight:800;color:var(--primary)}.spark{font-size:18px;padding-left:3px}.hero h1{font-size:clamp(32px,4.2vw,53px);letter-spacing:-.055em;font-weight:850;line-height:1.3;margin:12px 0 15px}.hero h1 em{font-style:normal;color:var(--primary)}.hero p{color:var(--muted);line-height:1.95;font-size:14px}.hero-counts{display:flex;flex-wrap:wrap;gap:17px;margin-top:27px}.hero-count{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--muted);padding-right:18px;border-right:1px solid var(--line)}.hero-count:last-child{border:0}.hero-count strong{font-size:18px;color:var(--ink);font-weight:800}.tool-panel{background:var(--paper);border:1px solid var(--border);border-radius:17px;box-shadow:var(--shadow);padding:13px;display:flex;align-items:center;gap:13px;flex-wrap:wrap}.search-wrap{min-width:220px;flex:1;display:flex;align-items:center;gap:11px;padding:0 12px;height:44px;border-radius:10px;background:var(--bg);border:1px solid var(--border)}.search-wrap svg{flex-shrink:0;color:var(--muted)}.search-wrap input{width:100%;background:transparent;outline:none!important;border:0;min-width:0;color:var(--ink);font-size:13px}.search-wrap input::placeholder{color:#a1aabb}.keycap{border:0;background:transparent;color:var(--muted);font-size:11px;white-space:nowrap}.subject-tabs{display:flex;gap:6px;flex-wrap:wrap}.subject-tab{background:transparent;border:0;border-radius:10px;padding:10px 14px;color:var(--muted);white-space:nowrap;font-size:13px;font-weight:650}.subject-tab.active{color:var(--primary);background:var(--primary-soft)}.subject-tab:hover{background:var(--bg)}.workspace{margin-top:34px}.work-header{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;margin:0 0 19px}.work-header h2{font-size:clamp(21px,2.6vw,28px);font-weight:800;letter-spacing:-.035em;margin:7px 0 5px}.work-desc{margin:0;color:var(--muted);font-size:12px;line-height:1.8}.work-stat{white-space:nowrap;color:var(--muted);font-size:12px;padding-top:20px}.work-stat b{color:var(--ink);font-size:19px}.filters{display:flex;gap:9px;flex-wrap:wrap;margin-bottom:17px}.filter-pill,.book-pill{border:1px solid var(--border);background:var(--paper);border-radius:99px;padding:7px 13px;font-size:12px;color:var(--muted);transition:.15s}.filter-pill.active,.book-pill.active{color:var(--primary);background:var(--primary-soft);border-color:transparent;font-weight:750}.filter-pill:hover,.book-pill:hover{border-color:var(--primary)}.book-selector{display:flex;gap:8px;flex-wrap:wrap;margin:4px 0 16px}.chapter-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:11px;margin:0 0 21px}.chapter-item{width:100%;min-height:69px;border:1px solid var(--border);border-radius:14px;background:var(--paper);display:flex;align-items:center;text-align:left;padding:12px 13px;gap:11px;color:var(--ink);transition:.18s;box-shadow:0 5px 20px rgba(24,39,72,.018)}.chapter-item.active{border-color:#aebcff;background:var(--primary-soft);box-shadow:0 5px 25px rgba(68,91,189,.065)}.chapter-item:hover{transform:translateY(-1px);border-color:#aebcff}.chapter-icon{width:35px;height:35px;border-radius:10px;display:grid;place-items:center;font-weight:750;color:var(--primary);background:var(--primary-soft);font-size:12px;flex-shrink:0}.chapter-item.active .chapter-icon{background:var(--paper)}.chapter-name{font-size:12px;font-weight:680;line-height:1.5;flex:1}.chapter-number{font-size:10px;color:var(--muted);margin-top:2px;font-weight:450}.chapter-item .chev{width:16px;height:16px;color:#9aa6bc;transform:rotate(-90deg)}.chapter-item.active .chev{color:var(--primary)}.subheading{display:flex;gap:10px;justify-content:space-between;align-items:center;margin:24px 0 13px}.subheading strong{font-size:16px}.subheading small{font-size:11px;color:var(--muted)}.cards{display:flex;flex-direction:column;gap:12px}.knowledge-card{background:var(--paper);border:1px solid var(--border);border-radius:15px;overflow:hidden;transition:border-color .18s;box-shadow:var(--shadow)}.knowledge-card.expanded{border-color:#bac8f7}.knowledge-card-head{padding:18px 19px;display:flex;align-items:center;gap:13px}.knowledge-card-head:hover{background:var(--bg)}.index-bubble{width:38px;height:38px;border-radius:11px;background:var(--bg);color:var(--primary);font-size:12px;font-weight:750;display:grid;place-items:center;flex-shrink:0}.knowledge-title{flex:1;min-width:0}.knowledge-title strong{display:block;font-size:14px;letter-spacing:.01em}.knowledge-title small{display:block;color:var(--muted);font-size:11px;line-height:1.5;margin-top:3px}.card-actions{display:flex;align-items:center;gap:4px}.card-action{border:0;background:transparent;width:34px;height:34px;border-radius:9px;color:#a9b2c2;display:grid;place-items:center}.card-action:hover{background:var(--primary-soft);color:var(--primary)}.card-action.active{color:#ddaf49}.card-action.done{color:#3aae8a}.card-action.done svg,.card-action.active svg{fill:currentColor;fill-opacity:.15}.card-chevron{color:#8793a9;display:grid;place-items:center;transform:rotate(0deg);transition:.2s}.expanded .card-chevron{transform:rotate(180deg)}.card-details{padding:0 22px 21px;border-top:1px solid var(--border);background:var(--paper)}.detail-title{font-weight:800;font-size:12px;color:var(--muted);margin:20px 0 9px;letter-spacing:.045em;display:flex;gap:7px;align-items:center}.detail-title:before{content:"";height:13px;width:3px;background:var(--primary);border-radius:3px}.fact-list{padding-left:21px;margin:0;color:var(--ink);line-height:1.85;font-size:13px}.fact-list li{padding:2px 0}.mathbox{display:block;background:var(--primary-soft);border-radius:11px;padding:15px 18px;color:var(--math);font-weight:750;line-height:1.85;white-space:pre-wrap;overflow-wrap:anywhere;font-family:'Times New Roman','Cambria Math','PingFang SC',serif;font-size:16px;letter-spacing:.01em}.question-box{background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:15px;margin-top:14px}.question-type{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:var(--primary);font-weight:750;letter-spacing:.04em;margin-bottom:8px}.question-text{font-size:13px;font-weight:620;line-height:1.85;color:var(--ink)}.solution-closed{margin-top:11px}.reveal-btn,.mini-btn{display:inline-flex;align-items:center;gap:6px;padding:7px 11px;border:1px solid var(--border);background:var(--paper);color:var(--primary);font-size:11px;border-radius:8px;font-weight:700}.reveal-btn:hover,.mini-btn:hover{background:var(--primary-soft)}.solution-box{border-top:1px dashed var(--line);margin-top:13px;padding-top:12px;font-size:13px;line-height:1.85}.solution-box b{color:var(--primary)}.tip{margin-top:15px;border-radius:10px;padding:11px 14px;background:rgba(234,162,57,.07);color:var(--ink);font-size:12px;line-height:1.8;border:1px solid rgba(234,162,57,.12)}.tip strong{color:#c08a3c}.my-note{margin-top:18px;border-top:1px solid var(--border);padding-top:16px;display:flex;align-items:center;justify-content:space-between;gap:12px}.note-preview{font-size:11px;color:var(--muted);line-height:1.5;max-width:75%;overflow-wrap:anywhere}.note-preview b{color:var(--ink)}.card-bottom{display:flex;gap:8px;flex-wrap:wrap;justify-content:space-between;align-items:center;margin-top:17px}.card-status{border-radius:99px;font-size:11px;padding:5px 12px;border:1px solid var(--border);background:var(--paper);color:var(--muted)}.card-status.done{background:rgba(55,165,126,.09);border-color:rgba(55,165,126,.2);color:#21a577}.search-path{font-size:11px;color:var(--muted);margin-bottom:8px}.empty{min-height:180px;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--paper);border:1px dashed var(--line);border-radius:15px;color:var(--muted);gap:5px}.empty span{font-size:40px}.empty strong{color:var(--ink)}.empty p{font-size:12px}.footer{padding:55px 0 30px;font-size:11px;color:var(--muted);display:flex;justify-content:space-between;gap:25px;border-top:1px solid var(--border);margin-top:65px}.footer div{color:var(--ink);white-space:nowrap;font-weight:800}.footer p{max-width:620px;text-align:right;margin:0}.note-dialog{width:min(92vw,580px);padding:0;background:var(--paper);border:1px solid var(--border);border-radius:20px;color:var(--ink);box-shadow:0 35px 95px rgba(2,14,40,.25)}.note-dialog::backdrop{background:rgba(7,15,32,.57);backdrop-filter:blur(4px)}.note-dialog form{padding:25px}.dialog-head{display:flex;justify-content:space-between;gap:16px;margin-bottom:20px}.dialog-head h3{margin:3px 0;font-size:21px}.dialog-head p{font-size:12px;margin:0;color:var(--muted)}.note-dialog label{display:flex;flex-direction:column;gap:7px;font-size:12px;font-weight:750;margin-top:16px}.note-dialog input,.note-dialog textarea{background:var(--bg);color:var(--ink);padding:11px 13px;border:1px solid var(--border);border-radius:10px;outline:none;resize:vertical;font-size:13px;font-weight:450}.dialog-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:23px}.btn-primary,.btn-ghost{border:0;border-radius:10px;padding:10px 17px;font-weight:720;font-size:12px}.btn-primary{color:#fff;background:#4d64ca}.btn-ghost{color:var(--muted);background:var(--bg)}.toast{position:fixed;right:25px;bottom:25px;background:#20314e;color:#fff;z-index:100;font-size:12px;padding:11px 17px;border-radius:11px;opacity:0;transform:translateY(10px);pointer-events:none;transition:.2s;box-shadow:0 10px 25px rgba(0,0,0,.13)}.toast.show{opacity:1;transform:translateY(0)}.shade{display:none}
@media(min-width:1250px){.chapter-list{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:1050px){.sidebar{width:232px}.main{margin-left:232px}.brand{padding:0 15px}.topbar{padding:0 24px}.page{padding:0 25px}.subject-tab{padding:8px 11px}}
@media(max-width:740px){.sidebar{width:min(320px,86vw);transform:translateX(-101%);transition:transform .23s ease;box-shadow:12px 0 25px rgba(0,0,0,.12)}body.nav-open .sidebar{transform:translateX(0)}.shade{display:block;position:fixed;inset:0;background:rgba(7,14,27,.5);z-index:50;opacity:0;pointer-events:none;transition:opacity .2s}body.nav-open .shade{opacity:1;pointer-events:auto}.mobile-close,.mobile-menu{display:grid}.mobile-close{margin-left:auto;background:#202e46;border-color:#34425c;color:#c0cbe0}.main{margin:0}.topbar{height:60px;padding:0 16px}.edition{display:none}.page{padding:0 15px}.hero{padding:30px 4px 20px}.hero h1{font-size:34px}.hero p{font-size:12px}.hero-counts{gap:8px;margin-top:20px}.hero-count{padding-right:9px;font-size:10px}.hero-count strong{font-size:15px}.tool-panel{padding:9px;gap:8px}.search-wrap{flex-basis:100%}.subject-tabs{width:100%;display:grid;grid-template-columns:repeat(3,1fr)}.subject-tab{text-align:center;font-size:12px}.work-header{margin-top:0}.work-stat{padding-top:16px}.workspace{margin-top:26px}.chapter-list{grid-template-columns:1fr 1fr;gap:8px}.chapter-item{min-height:67px;padding:10px 9px}.chapter-icon{width:27px;height:27px;font-size:10px}.chapter-name{font-size:11px}.chapter-item .chev{display:none}.knowledge-card-head{padding:12px 11px;gap:9px}.index-bubble{width:31px;height:31px;font-size:11px}.knowledge-title strong{font-size:13px}.knowledge-title small{font-size:10px}.card-actions{gap:0}.card-action{width:29px;height:30px}.card-action svg{width:17px;height:17px}.card-details{padding:0 15px 16px}.footer{display:block;padding:25px 0}.footer p{text-align:left;margin-top:6px}.work-header h2{font-size:21px}.work-desc{font-size:11px}.mathbox{font-size:14px}.note-dialog form{padding:17px}}
@media(max-width:360px){.chapter-list{grid-template-columns:1fr}.chapter-item{min-height:55px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media print{.sidebar,.topbar,.tool-panel,.filters,.chapter-list,.card-actions,.card-status,.reveal-btn,.my-note,.footer,.hero,.toast{display:none!important}.main{margin:0}.page{padding:0}.knowledge-card{break-inside:avoid}.card-details{display:block!important}.solution-box[hidden]{display:block!important}}
[hidden]{display:none!important}
.chapter-number{display:block}

.photo-hint{font-size:11px;color:var(--muted);font-weight:400}.photo-area{border:1px solid var(--border);border-radius:12px;background:var(--bg);padding:12px;display:flex;align-items:center;gap:12px;margin-top:12px}.photo-area img{max-width:140px;max-height:140px;border-radius:8px;object-fit:contain}.note-image{display:block;max-width:100%;max-height:260px;object-fit:contain;border:1px solid var(--border);border-radius:10px;margin:11px 0;background:var(--bg)}.note-preview .photo-mark{font-weight:650;color:var(--primary)}

/* v3: smooth inline chapter/card study flow */
:root{--ease:cubic-bezier(.22,1,.36,1)}
html{scroll-padding-top:90px}
body{overflow-x:hidden}
.hero h1{font-size:clamp(35px,5vw,64px);font-weight:850;letter-spacing:-.035em}
.hero{animation:pageEnter .55s var(--ease) both}
.tool-panel{animation:pageEnter .62s var(--ease) both}
.section-guide{display:flex;align-items:baseline;justify-content:space-between;gap:14px;margin:19px 0 10px;font-size:12px;font-weight:730;color:var(--ink)}
.section-guide small{font-weight:450;color:var(--muted)}
.chapter-toolbar{scroll-margin-top:86px;display:flex;gap:18px;align-items:center;justify-content:space-between;border:1px solid var(--border);background:var(--paper);padding:16px 17px;border-radius:15px;margin:22px 0 12px;box-shadow:0 8px 22px rgba(20,38,78,.025)}
.chapter-toolbar-title{display:flex;flex-direction:column;min-width:0;flex:1}
.chapter-toolbar-title strong{font-size:15px;line-height:1.6}
.chapter-toolbar-title small{color:var(--muted);font-size:11px}
.step-label{font-size:10px;letter-spacing:.05em;color:var(--primary);font-weight:750}
.chapter-toolbar-actions{display:flex;align-items:center;gap:6px;flex-wrap:wrap;justify-content:flex-end}
.chapter-toolbar-actions button{border:1px solid var(--border);border-radius:9px;background:var(--bg);color:var(--ink);font-size:11px;padding:9px 11px;white-space:nowrap;transition:background .18s ease,transform .18s ease}
.chapter-toolbar-actions button:hover{background:var(--primary-soft);transform:translateY(-1px)}
.chapter-list{scroll-margin-top:90px;animation:pageEnter .32s var(--ease) both}
.chapter-item{position:relative;transition:border-color .25s ease, background .25s ease, transform .25s var(--ease), box-shadow .25s ease}
.chapter-item.active:after{content:'学习中';font-size:10px;color:var(--primary);position:absolute;top:6px;right:9px;font-weight:650}
.cards{animation:pageEnter .36s var(--ease) both}
.knowledge-card{scroll-margin-top:80px;transition:border-color .3s ease,box-shadow .3s ease, transform .2s ease}
.knowledge-card-head{cursor:pointer;transition:background .22s ease}
.knowledge-card.expanded{box-shadow:0 17px 43px rgba(57,78,149,.065)}
.card-expand{display:grid;grid-template-rows:0fr;opacity:0;visibility:hidden;transition:grid-template-rows .42s var(--ease),opacity .32s ease,visibility .42s}
.knowledge-card.expanded .card-expand{grid-template-rows:1fr;opacity:1;visibility:visible;transition:grid-template-rows .42s var(--ease),opacity .33s ease,visibility 0s}
.card-expand .card-details{min-height:0;overflow:hidden;padding-top:0;padding-bottom:0;transition:padding .38s var(--ease);border-top:0}
.knowledge-card.expanded .card-expand .card-details{padding-top:0;padding-bottom:21px;border-top:1px solid var(--border)}
.mathbox{font-family:ui-serif, 'Cambria Math','Noto Sans Math','Times New Roman','Noto Sans CJK SC',serif;font-variant-numeric:lining-nums;line-height:1.95;letter-spacing:0;overflow-x:auto;overflow-wrap:anywhere;word-break:normal;white-space:pre-wrap;font-size:15px}
.question-text,.solution-box,.fact-list{overflow-wrap:anywhere}
.maker{display:block;font-size:12px;font-weight:700;color:var(--ink);margin-top:5px}
.footer div{white-space:normal}
@keyframes pageEnter{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
@media(max-width:740px){
.hero{padding:26px 3px 17px}.hero h1{font-size:37px;line-height:1.2}
.hero p{font-size:12px;line-height:1.8}
.chapter-list{grid-template-columns:1fr;gap:9px}
.chapter-item{min-height:62px;padding:12px 14px;gap:12px}
.chapter-icon{width:35px;height:35px;font-size:11px}
.chapter-name{font-size:13px}
.chapter-number{font-size:11px}
.chapter-item .chev{display:block}
.chapter-toolbar{display:block;padding:13px;margin:18px 0 8px}
.chapter-toolbar-actions{margin-top:12px;justify-content:flex-start;gap:7px}
.chapter-toolbar-actions button{flex:1 1 auto;font-size:11px;padding:8px 10px}
.chapter-toolbar-title strong{font-size:14px}
.section-guide{font-size:11px;margin:15px 0 9px;align-items:center}
.section-guide small{max-width:155px;text-align:right;font-size:10px}
.knowledge-title strong{font-size:14px}
.knowledge-title small{font-size:11px}
.card-expand .card-details{padding-left:14px;padding-right:14px}
.knowledge-card.expanded .card-expand .card-details{padding-bottom:16px}
.mathbox{font-size:15px;padding:15px 13px;line-height:2}
.fact-list,.question-text,.solution-box{font-size:13px;line-height:1.9}
.footer{margin-top:38px;padding-bottom:calc(32px + env(safe-area-inset-bottom))}
}
@media(prefers-reduced-motion:reduce){.hero,.tool-panel,.cards,.chapter-list{animation:none}.card-expand{transition:none}.card-expand .card-details{transition:none}}

/* In-place worked-solution disclosure */
.solution-box{max-height:0;opacity:0;overflow:hidden;visibility:hidden;border-top:0;margin-top:0;padding-top:0;transition:max-height .48s var(--ease),opacity .24s ease,margin-top .32s ease,padding-top .32s ease,visibility .45s}
.solution-box.is-visible{max-height:1200px;opacity:1;visibility:visible;border-top:1px dashed var(--line);margin-top:13px;padding-top:12px;transition:max-height .55s var(--ease),opacity .3s ease,margin-top .32s ease,padding-top .32s ease,visibility 0s}
.reveal-btn svg{transition:transform .25s}.reveal-btn[aria-expanded=true] svg{transform:rotate(180deg)}
@media(prefers-reduced-motion:reduce){.solution-box{transition:none}}

/* Render legacy vector arrows above the variable, not as unsupported combining glyphs. */
.vecmark{position:relative;display:inline-block;padding-top:.32em;line-height:1.2;font-style:italic;min-width:.75em;text-align:center}
.vecarrow{position:absolute;top:-.28em;left:0;right:0;text-align:center;line-height:.8;font-family:serif;font-style:normal;font-size:.82em}