/* ============ 句句精读 · 小程序风格样式 ============ */
:root{
  --bg:#f3f6fc; --card:#ffffff; --card2:#f8faff;
  --ink:#182238; --ink2:#5a6780; --ink3:#93a0b8;
  --line:#e7ecf6; --line2:#dfe6f2;
  --brand:#4f46e5; --brand2:#06b6d4; --brand-soft:#eef0ff;
  --warm:#f59e0b; --warm-soft:#fff5e3;
  --ok:#10b981; --ok-soft:#e7f8f1;
  --purple:#8b5cf6; --purple-soft:#f3edff;
  --gray-soft:#eef1f7;
  --danger:#ef4444;
  --shadow:0 6px 22px rgba(28,42,88,.07);
  --shadow-lg:0 14px 40px rgba(28,42,88,.14);
  --r:18px; --r-sm:12px;
  --fs:15px;
  --tab-h:70px;
}
html[data-fs="s"]{--fs:13.5px}
html[data-fs="l"]{--fs:17px}
html[data-theme="dark"]{
  --bg:#0f1524; --card:#1a2236; --card2:#212b42;
  --ink:#eaf0ff; --ink2:#a8b4cc; --ink3:#6c7a95;
  --line:#2a3550; --line2:#34405e;
  --brand-soft:#272a52; --warm-soft:#3a2f18; --ok-soft:#16362c;
  --purple-soft:#2e2352; --gray-soft:#26314a;
  --shadow:0 6px 22px rgba(0,0,0,.22); --shadow-lg:0 14px 40px rgba(0,0,0,.4);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0;height:100%;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);font-size:var(--fs)}
button,input,textarea,select{font-family:inherit;font-size:inherit;color:inherit}
button{cursor:pointer;border:none;background:none}
svg{width:1.15em;height:1.15em;fill:currentColor;display:block}
input,textarea{outline:none}

/* 桌面背景 */
.desktop-bg{position:fixed;inset:0;z-index:0;background:radial-gradient(1100px 700px at 12% 10%,#dfe6ff 0%,transparent 60%),radial-gradient(900px 700px at 88% 85%,#d9f4f6 0%,transparent 60%),#eef2fa}
html[data-theme="dark"] .desktop-bg{background:radial-gradient(900px 700px at 15% 10%,#1b2350 0%,transparent 60%),radial-gradient(800px 600px at 85% 85%,#123a45 0%,transparent 60%),#080d18}
.app-shell{position:relative;z-index:1;min-height:100%;display:flex;align-items:center;justify-content:center;padding:0}
.app{position:relative;width:100%;max-width:440px;height:100dvh;max-height:100dvh;display:flex;flex-direction:column;background:var(--bg);overflow:hidden}
@media(min-width:600px){
  .app-shell{padding:24px 0}
  .app{height:min(880px,calc(100dvh - 48px));max-height:min(880px,calc(100dvh - 48px));border-radius:30px;box-shadow:0 30px 80px rgba(24,34,56,.28);border:1px solid rgba(255,255,255,.5)}
  html[data-theme="dark"] .app{border-color:#2a3550}
}

/* 状态栏 */
.statusbar{height:36px;flex:none;background:linear-gradient(110deg,var(--brand),#6366f1 55%,var(--brand2));color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 18px;font-size:12px;letter-spacing:.3px;font-weight:600}
.sb-left,.sb-right{display:flex;align-items:center;gap:7px}
.sb-dot{width:7px;height:7px;border-radius:50%;background:#fff;box-shadow:0 0 0 3px rgba(255,255,255,.25)}
.sb-battery{width:17px;height:9px;border:1.4px solid #fff;border-radius:2px;position:relative;opacity:.9}
.sb-battery:after{content:"";position:absolute;right:-3px;top:2px;width:2px;height:3px;background:#fff;border-radius:0 1px 1px 0}
.sb-battery:before{content:"";position:absolute;left:1.5px;top:1.5px;bottom:1.5px;width:9px;background:#fff;border-radius:1px}

/* 主区 */
.main{flex:1;overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch;scrollbar-width:none;padding-bottom:calc(var(--tab-h) + 12px)}
.main::-webkit-scrollbar{display:none}
.view{display:none;padding:14px 16px 8px;animation:fade .28s ease}
.view.active{display:block}
.view.overlay{position:absolute;inset:0;z-index:40;background:var(--bg);padding:0;overflow-y:auto;padding-bottom:24px;scrollbar-width:none}
.view.overlay::-webkit-scrollbar{display:none}
@keyframes fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* 通用组件 */
.card{background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);padding:16px;margin-bottom:12px;border:1px solid var(--line)}
.sec-title{display:flex;align-items:center;justify-content:space-between;margin:20px 2px 11px}
.sec-title h3{margin:0;font-size:15.5px;font-weight:700;letter-spacing:.2px}
.sec-title .more{font-size:12.5px;color:var(--ink3);display:flex;align-items:center;gap:2px}
.sec-title .more svg{width:.9em;height:.9em}
.muted{color:var(--ink3)}
.tiny{font-size:11.5px}
.small{font-size:12.5px}
.bold{font-weight:700}
.tag{display:inline-flex;align-items:center;padding:3px 9px;border-radius:999px;font-size:11px;font-weight:600;background:var(--brand-soft);color:var(--brand);white-space:nowrap}
.tag.cet4{background:#e6f6ff;color:#0284c7}
.tag.cet6{background:#f3edff;color:#7c3aed}
.tag.sec-a{background:var(--warm-soft);color:#b45309}
.tag.sec-b{background:var(--ok-soft);color:#059669}
.tag.sec-c{background:var(--brand-soft);color:var(--brand)}
html[data-theme="dark"] .tag.cet4{background:#123449;color:#7dd3fc}
html[data-theme="dark"] .tag.cet6{background:#2e2352;color:#c4b5fd}
html[data-theme="dark"] .tag.sec-a{background:#3a2f18;color:#fbbf24}
html[data-theme="dark"] .tag.sec-b{background:#16362c;color:#6ee7b7}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 16px;border-radius:12px;font-weight:600;font-size:13.5px;background:var(--brand-soft);color:var(--brand);transition:transform .15s,filter .15s}
.btn:active{transform:scale(.97)}
.btn.primary{background:linear-gradient(110deg,var(--brand),#6366f1);color:#fff;box-shadow:0 6px 18px rgba(79,70,229,.28)}
.btn.ghost{background:var(--card2);color:var(--ink2);border:1px solid var(--line)}
.btn.block{width:100%}
.btn.sm{padding:7px 12px;font-size:12px;border-radius:10px}
.btn:disabled{opacity:.5;pointer-events:none}
.divider{height:1px;background:var(--line);margin:12px 0}
.empty{text-align:center;padding:44px 20px;color:var(--ink3)}
.empty svg{width:38px;height:38px;margin:0 auto 12px;opacity:.35}
.empty p{margin:4px 0;font-size:13px}

/* 首页 */
.hero{position:relative;overflow:hidden;border-radius:22px;padding:20px 18px 18px;color:#fff;background:linear-gradient(125deg,#4f46e5 0%,#6366f1 48%,#0891b2 100%);box-shadow:0 12px 30px rgba(79,70,229,.28);margin-bottom:14px}
.hero:after{content:"";position:absolute;right:-45px;top:-55px;width:170px;height:170px;border-radius:50%;background:rgba(255,255,255,.09)}
.hero:before{content:"";position:absolute;right:20px;bottom:-70px;width:130px;height:130px;border-radius:50%;background:rgba(255,255,255,.07)}
.hero .h-label{font-size:11.5px;opacity:.82;letter-spacing:1px;font-weight:600}
.hero h1{margin:7px 0 5px;font-size:22px;letter-spacing:.5px;font-weight:800}
.hero .h-sub{font-size:12.5px;opacity:.88;line-height:1.6;max-width:78%;position:relative;z-index:1}
.hero .h-stats{display:flex;gap:22px;margin-top:18px;position:relative;z-index:1}
.hero .h-stats div{display:flex;flex-direction:column}
.hero .h-stats b{font-size:20px;line-height:1.1;font-weight:800}
.hero .h-stats span{font-size:11px;opacity:.8;margin-top:3px}
.hero .h-badge{position:absolute;right:16px;top:16px;background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.28);padding:5px 10px;border-radius:999px;font-size:10.5px;font-weight:600;backdrop-filter:blur(6px)}

.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:12px}
.stat-item{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:13px 10px;text-align:center;box-shadow:var(--shadow)}
.stat-item b{display:block;font-size:20px;font-weight:800;color:var(--brand);line-height:1.15}
.stat-item span{font-size:11px;color:var(--ink3);margin-top:4px;display:block}

.daily-card{background:linear-gradient(135deg,#fffaf0,#fff 60%);border:1px solid #f5e6c8;position:relative;overflow:hidden}
html[data-theme="dark"] .daily-card{background:linear-gradient(135deg,#2a2418,var(--card) 60%);border-color:#3d3520}
.daily-card .dc-top{display:flex;align-items:center;gap:8px;font-size:12px;color:#b45309;font-weight:700}
html[data-theme="dark"] .daily-card .dc-top{color:#fbbf24}
.daily-card .dc-top svg{width:1.1em;height:1.1em}
.daily-card .dc-sentence{font-family:Georgia,"Times New Roman",serif;font-size:15px;line-height:1.65;margin:11px 0 14px;color:var(--ink);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.daily-card .dc-foot{display:flex;align-items:center;justify-content:space-between}

.quick-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.quick{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:14px;box-shadow:var(--shadow);display:flex;align-items:center;gap:11px;text-align:left}
.quick .q-ico{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;flex:none}
.quick .q-ico svg{width:19px;height:19px}
.quick b{display:block;font-size:13.5px}
.quick span{font-size:11px;color:var(--ink3);display:block;margin-top:2px}

.recent-row{display:flex;align-items:center;gap:11px;padding:11px 2px;border-bottom:1px solid var(--line)}
.recent-row:last-child{border-bottom:none}
.recent-row .rr-ico{width:32px;height:32px;border-radius:10px;background:var(--brand-soft);color:var(--brand);display:grid;place-items:center;flex:none}
.recent-row .rr-ico svg{width:16px;height:16px}
.recent-row .rr-main{flex:1;min-width:0}
.recent-row .rr-main b{font-size:13px;display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.recent-row .rr-main span{font-size:11px;color:var(--ink3)}

/* 筛选/列表 */
.filter-bar{position:sticky;top:0;z-index:12;background:var(--bg);padding:4px 0 10px;margin-bottom:2px}
.searchbox{display:flex;align-items:center;gap:8px;background:var(--card);border:1px solid var(--line);border-radius:13px;padding:9px 12px;box-shadow:var(--shadow)}
.searchbox svg{width:16px;height:16px;color:var(--ink3);flex:none}
.searchbox input{flex:1;border:none;background:none;font-size:13px;min-width:0}
.chips{display:flex;gap:7px;overflow-x:auto;padding:10px 0 2px;scrollbar-width:none}
.chips::-webkit-scrollbar{display:none}
.chip{flex:none;padding:6px 13px;border-radius:999px;background:var(--card);border:1px solid var(--line);font-size:12px;color:var(--ink2);font-weight:600;transition:all .18s}
.chip.on{background:var(--brand);border-color:var(--brand);color:#fff;box-shadow:0 4px 12px rgba(79,70,229,.25)}
.list-meta{display:flex;align-items:center;justify-content:space-between;font-size:11.5px;color:var(--ink3);margin:8px 2px 10px}
.a-row{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:13px 14px;margin-bottom:10px;box-shadow:var(--shadow);transition:transform .15s}
.a-row:active{transform:scale(.99)}
.a-row .ar-head{display:flex;align-items:center;gap:6px;margin-bottom:8px;flex-wrap:wrap}
.a-row h4{margin:0 0 5px;font-size:14px;line-height:1.45;font-weight:700;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.a-row .ar-sub{font-size:11.5px;color:var(--ink3);display:flex;align-items:center;gap:10px}
.a-row .ar-sub span{display:inline-flex;align-items:center;gap:3px}
.a-row .done-dot{width:7px;height:7px;border-radius:50%;background:var(--ok);display:inline-block}

/* 每日一句 */
.daily-hero{background:linear-gradient(135deg,#4f46e5,#7c3aed 60%,#0891b2);color:#fff;border-radius:22px;padding:18px;margin-bottom:14px;box-shadow:0 12px 30px rgba(79,70,229,.25)}
.daily-hero .dh-top{display:flex;align-items:center;justify-content:space-between;font-size:11.5px;opacity:.9;font-weight:600}
.daily-hero .dh-date{font-size:20px;font-weight:800;margin:8px 0 3px}
.daily-hero .dh-tip{font-size:12px;opacity:.85;line-height:1.5}
.step-bar{display:flex;gap:5px;margin:0 0 14px}
.step-bar i{flex:1;height:4px;border-radius:4px;background:var(--line2);transition:background .3s}
.step-bar i.on{background:var(--brand)}
.step-card{background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:18px;margin-bottom:12px}
.step-kicker{display:flex;align-items:center;gap:7px;font-size:11.5px;font-weight:700;color:var(--brand);letter-spacing:.4px;margin-bottom:12px}
.step-kicker .sk-num{width:20px;height:20px;border-radius:7px;background:var(--brand);color:#fff;display:grid;place-items:center;font-size:11px}
.sentence-big{font-family:Georgia,"Times New Roman",serif;font-size:17px;line-height:1.85;color:var(--ink);word-spacing:.5px}
.sentence-big .wd{cursor:pointer;border-radius:4px;padding:0 1px;transition:background .15s}
.sentence-big .wd:hover{background:var(--warm-soft)}
.sentence-big .wd.marked{background:#fff0c9;border-bottom:2px solid var(--warm)}
html[data-theme="dark"] .sentence-big .wd.marked{background:#4a3a12}
.chunk-line{font-family:Georgia,serif;font-size:16px;line-height:2.1;word-spacing:1px}
.chunk{display:inline;padding:3px 5px;margin:0 1px;border-radius:6px;position:relative}
.chunk.main{background:var(--brand-soft);color:var(--brand);font-weight:700;box-shadow:inset 0 -2px 0 var(--brand)}
.chunk.clause{background:var(--purple-soft);color:#7c3aed}
.chunk.modifier{background:var(--gray-soft);color:var(--ink2)}
.chunk.connector{background:var(--warm-soft);color:#b45309;font-weight:700}
.chunk.nonfinite{background:var(--ok-soft);color:#059669}
.chunk-sep{color:var(--ink3);font-weight:300;padding:0 2px}
.legend{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px;padding-top:13px;border-top:1px dashed var(--line)}
.legend span{font-size:10.5px;color:var(--ink2);display:inline-flex;align-items:center;gap:4px}
.legend i{width:9px;height:9px;border-radius:3px;display:inline-block}
.struct-list{display:flex;flex-direction:column;gap:8px;margin-top:4px}
.struct-item{display:flex;gap:9px;align-items:flex-start;font-size:12.5px;line-height:1.55}
.struct-item .si-dot{width:6px;height:6px;border-radius:50%;background:var(--brand2);flex:none;margin-top:7px}
.struct-item b{color:var(--brand)}
.trans-box{width:100%;min-height:88px;border:1px solid var(--line2);background:var(--card2);border-radius:12px;padding:11px 12px;font-size:13.5px;line-height:1.6;resize:vertical}
.trans-box:focus{border-color:var(--brand)}
.step-actions{display:flex;gap:9px;margin-top:14px}
.step-actions .btn{flex:1}
.checkin-strip{display:flex;gap:6px;justify-content:space-between;margin-top:6px}
.checkin-strip .cd{flex:1;text-align:center;font-size:10px;color:var(--ink3)}
.checkin-strip .cd i{display:block;width:100%;height:30px;border-radius:9px;background:var(--gray-soft);margin-bottom:5px;display:grid;place-items:center;font-style:normal;font-size:12px;color:var(--ink3)}
.checkin-strip .cd i.on{background:var(--ok);color:#fff}

/* 文章详情 */
.art-header{position:sticky;top:0;z-index:30;background:var(--card);border-bottom:1px solid var(--line);padding:10px 14px;display:flex;align-items:center;gap:10px}
.art-header .ah-back{width:32px;height:32px;border-radius:10px;background:var(--card2);display:grid;place-items:center;flex:none}
.art-header .ah-back svg{width:17px;height:17px}
.art-header .ah-title{flex:1;min-width:0}
.art-header .ah-title b{font-size:13.5px;display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.art-header .ah-title span{font-size:10.5px;color:var(--ink3)}
.art-header .ah-fav{width:32px;height:32px;border-radius:10px;background:var(--card2);display:grid;place-items:center;flex:none;color:var(--ink3)}
.art-header .ah-fav.on{color:var(--warm)}
.art-body{padding:14px 16px 30px}
.mode-tabs{display:flex;background:var(--card2);border:1px solid var(--line);border-radius:12px;padding:3px;margin-bottom:14px}
.mode-tabs button{flex:1;padding:8px 4px;border-radius:9px;font-size:12.5px;font-weight:600;color:var(--ink2)}
.mode-tabs button.on{background:var(--card);color:var(--brand);box-shadow:var(--shadow)}
.para{font-family:Georgia,"Times New Roman",serif;font-size:15.5px;line-height:1.95;color:var(--ink);margin-bottom:15px;text-align:justify}
.para .sn{cursor:pointer;border-radius:4px;padding:1px 0;transition:background .15s}
.para .sn:hover{background:var(--brand-soft)}
.para .sn.active{background:#fff0c9}
html[data-theme="dark"] .para .sn.active{background:#4a3a12}
.para-label{display:inline-block;font-weight:700;color:var(--brand);margin-right:6px;font-family:inherit}
.sent-card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:14px;margin-bottom:11px;box-shadow:var(--shadow)}
.sent-card .sc-idx{font-size:10.5px;color:var(--ink3);font-weight:700;letter-spacing:.5px;margin-bottom:8px}
.sent-card .sc-text{font-family:Georgia,serif;font-size:15px;line-height:1.75}
.sent-card .sc-tools{display:flex;gap:8px;margin-top:11px;padding-top:10px;border-top:1px dashed var(--line)}
.sent-card .sc-tools button{font-size:11.5px;color:var(--brand);font-weight:600;display:inline-flex;align-items:center;gap:4px}
.analysis{background:var(--card2);border:1px solid var(--line);border-radius:14px;padding:13px;margin-top:11px}
.analysis h5{margin:0 0 9px;font-size:12px;color:var(--brand);font-weight:700}
.q-item{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:14px;margin-bottom:11px;box-shadow:var(--shadow)}
.q-item .q-no{font-size:11px;color:var(--brand);font-weight:800;letter-spacing:.5px}
.q-item .q-stem{font-size:13.5px;line-height:1.6;margin:6px 0 11px;font-weight:600}
.opt{display:flex;gap:9px;align-items:flex-start;padding:9px 10px;border:1px solid var(--line);border-radius:11px;margin-bottom:7px;font-size:12.5px;line-height:1.5;transition:all .18s}
.opt .o-l{width:20px;height:20px;border-radius:7px;background:var(--card2);display:grid;place-items:center;font-size:11px;font-weight:800;flex:none;color:var(--ink2)}
.opt.sel{border-color:var(--brand);background:var(--brand-soft)}
.opt.sel .o-l{background:var(--brand);color:#fff}
.opt.right{border-color:var(--ok);background:var(--ok-soft)}
.opt.right .o-l{background:var(--ok);color:#fff}
.word-bank{display:flex;flex-wrap:wrap;gap:7px;margin-top:10px}
.word-bank span{background:var(--card2);border:1px solid var(--line);border-radius:8px;padding:4px 9px;font-size:12px}
.word-bank b{color:var(--brand);margin-right:4px}

/* 生词本 */
.word-item{background:var(--card);border:1px solid var(--line);border-radius:15px;padding:13px 14px;margin-bottom:9px;box-shadow:var(--shadow);display:flex;gap:11px;align-items:flex-start}
.word-item .wi-main{flex:1;min-width:0}
.word-item .wi-word{font-family:Georgia,serif;font-size:17px;font-weight:700;color:var(--brand)}
.word-item .wi-mean{font-size:12.5px;color:var(--ink2);margin-top:4px;line-height:1.5}
.word-item .wi-src{font-size:11px;color:var(--ink3);margin-top:6px;font-style:italic;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.word-item input{width:100%;border:1px solid var(--line2);background:var(--card2);border-radius:9px;padding:7px 9px;font-size:12.5px;margin-top:8px}
.wi-del{color:var(--ink3);padding:4px;flex:none}
.wi-del svg{width:16px;height:16px}
.flashcard{perspective:900px;height:190px;margin-bottom:14px;cursor:pointer}
.flashcard .fc-in{position:relative;width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d}
.flashcard.flip .fc-in{transform:rotateY(180deg)}
.flashcard .fc-face{position:absolute;inset:0;backface-visibility:hidden;border-radius:20px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:20px;text-align:center;box-shadow:var(--shadow);border:1px solid var(--line)}
.flashcard .fc-front{background:linear-gradient(135deg,var(--brand),#7c3aed);color:#fff}
.flashcard .fc-front b{font-family:Georgia,serif;font-size:28px}
.flashcard .fc-front span{font-size:11.5px;opacity:.8;margin-top:10px}
.flashcard .fc-back{background:var(--card);transform:rotateY(180deg)}
.flashcard .fc-back b{font-size:16px}
.flashcard .fc-back p{font-size:12.5px;color:var(--ink2);line-height:1.6;margin:8px 0 0}

/* 我的 */
.me-head{display:flex;align-items:center;gap:13px;padding:6px 2px 16px}
.avatar{width:56px;height:56px;border-radius:20px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;display:grid;place-items:center;font-size:23px;font-weight:800;box-shadow:0 8px 20px rgba(79,70,229,.25)}
.me-head b{font-size:17px}
.me-head span{font-size:12px;color:var(--ink3);display:block;margin-top:3px}
.set-row{display:flex;align-items:center;justify-content:space-between;padding:12px 2px;border-bottom:1px solid var(--line)}
.set-row:last-child{border-bottom:none}
.set-row .sr-l{display:flex;align-items:center;gap:10px;font-size:13.5px}
.set-row .sr-l .sr-ico{width:28px;height:28px;border-radius:9px;background:var(--brand-soft);color:var(--brand);display:grid;place-items:center}
.set-row .sr-l svg{width:15px;height:15px}
.seg{display:flex;background:var(--card2);border:1px solid var(--line);border-radius:9px;padding:2px}
.seg button{padding:5px 10px;border-radius:7px;font-size:11.5px;color:var(--ink2);font-weight:600}
.seg button.on{background:var(--brand);color:#fff}
.switch{width:42px;height:24px;border-radius:99px;background:var(--line2);position:relative;transition:background .2s}
.switch:after{content:"";position:absolute;left:3px;top:3px;width:18px;height:18px;border-radius:50%;background:#fff;transition:transform .2s;box-shadow:0 1px 4px rgba(0,0,0,.15)}
.switch.on{background:var(--brand)}
.switch.on:after{transform:translateX(18px)}
.about-line{font-size:12px;color:var(--ink2);line-height:1.75;margin:5px 0}
.about-line b{color:var(--ink)}

/* TabBar */
.tabbar{height:var(--tab-h);flex:none;background:var(--card);border-top:1px solid var(--line);display:flex;align-items:stretch;padding:0 4px env(safe-area-inset-bottom);box-shadow:0 -4px 18px rgba(28,42,88,.05);z-index:20;position:relative}
.tab{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;color:var(--ink3);font-size:10.5px;font-weight:600;position:relative}
.tab svg{width:21px;height:21px}
.tab.active{color:var(--brand)}
.tab-main-btn{width:46px;height:46px;border-radius:16px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;display:grid;place-items:center;margin-top:-20px;box-shadow:0 8px 20px rgba(79,70,229,.35);border:3px solid var(--card)}
.tab-main-btn svg{width:23px;height:23px}
.tab.tab-main.active .tab-main-btn{transform:translateY(-2px)}

/* 弹层 / toast */
.sheet-mask{position:absolute;inset:0;background:rgba(15,22,40,.45);z-index:50;animation:fade .2s}
.hidden{display:none!important}
.sheet{position:absolute;left:0;right:0;bottom:0;z-index:51;background:var(--card);border-radius:22px 22px 0 0;padding:8px 18px calc(20px + env(safe-area-inset-bottom));box-shadow:var(--shadow-lg);max-height:74%;overflow-y:auto;animation:slideUp .26s cubic-bezier(.2,.8,.2,1)}
@keyframes slideUp{from{transform:translateY(100%)}to{transform:none}}
.sheet-handle{width:36px;height:4px;border-radius:4px;background:var(--line2);margin:6px auto 14px}
.sheet h3{margin:0 0 4px;font-size:16px}
.sheet .sheet-sub{font-size:12px;color:var(--ink3);margin-bottom:14px}
.sheet-word{font-family:Georgia,serif;font-size:26px;font-weight:700;color:var(--brand);margin:2px 0 6px}
.sheet-src{font-size:12px;color:var(--ink2);line-height:1.6;background:var(--card2);border-radius:10px;padding:10px;margin:10px 0}
.sheet label{font-size:11.5px;color:var(--ink3);font-weight:600;display:block;margin:12px 0 6px}
.sheet input[type=text],.sheet textarea{width:100%;border:1px solid var(--line2);background:var(--card2);border-radius:11px;padding:10px 12px;font-size:13.5px}
.toast{position:absolute;left:50%;bottom:calc(var(--tab-h) + 18px);transform:translate(-50%,12px);background:rgba(24,34,56,.92);color:#fff;padding:9px 16px;border-radius:999px;font-size:12.5px;z-index:80;opacity:0;pointer-events:none;transition:all .25s;white-space:nowrap;box-shadow:var(--shadow-lg)}
.toast.show{opacity:1;transform:translate(-50%,0)}
.pill-row{display:flex;gap:7px;flex-wrap:wrap;margin-top:8px}
.pill{padding:6px 11px;border-radius:999px;background:var(--card2);border:1px solid var(--line);font-size:12px;color:var(--ink2)}
.pill.on{background:var(--brand-soft);border-color:var(--brand);color:var(--brand);font-weight:700}
.notice{background:var(--warm-soft);border:1px solid #f5e0b5;border-radius:12px;padding:10px 12px;font-size:11.5px;line-height:1.6;color:#92620c;margin-bottom:12px}
html[data-theme="dark"] .notice{background:#332914;border-color:#4a3a18;color:#fbbf24}

/* ============ 参考译文（AI 辅助） ============ */
.art-header .ah-trans{width:32px;height:32px;border-radius:10px;background:var(--card2);display:grid;place-items:center;flex:none;color:var(--ink3);transition:background .15s,color .15s,box-shadow .15s}
.art-header .ah-trans svg{width:17px;height:17px}
.art-header .ah-trans.on{background:var(--brand);color:#fff;box-shadow:0 4px 12px rgba(79,70,229,.3)}
.sc-trans{margin-top:9px;padding:9px 11px;border-radius:10px;background:var(--ok-soft);border-left:3px solid var(--ok);font-size:13px;line-height:1.65;color:var(--ink2);display:flex;gap:8px;align-items:flex-start}
.sc-trans>span{flex:none;font-size:10px;font-weight:800;color:var(--ok);background:var(--card);border-radius:5px;padding:2px 5px;line-height:15px;letter-spacing:1px}
.para-wrap{margin-bottom:16px}
.para-wrap .para{margin-bottom:0}
.para-trans{margin-top:9px;padding:10px 12px;border-radius:11px;background:var(--card2);border:1px dashed var(--line2);font-size:13px;line-height:1.75;color:var(--ink2);text-align:justify}
.para-trans>span{display:inline-block;margin-right:8px;font-size:10.5px;font-weight:800;color:var(--brand);letter-spacing:.5px}
.ref-block{margin:10px 0 12px}
.ref-toggle{display:inline-flex;align-items:center;gap:6px;padding:7px 12px;border-radius:9px;background:var(--brand-soft);color:var(--brand);font-size:12px;font-weight:700}
.ref-toggle::after{content:'›';font-size:16px;line-height:1;transform:rotate(90deg)}
.ref-body{margin-top:9px;padding:11px 12px;border-radius:11px;background:var(--ok-soft);border:1px solid var(--line)}
.ref-zh{font-size:13.5px;line-height:1.75;color:var(--ink);margin-bottom:6px}
html[data-theme="dark"] .ref-body{border-color:var(--line2)}
.ref-toggle{border:none;cursor:pointer}

/* ============ 题目练习 · 断句解剖与译文对照 ============ */
.q-head{display:flex;justify-content:space-between;align-items:center;gap:8px}
.q-head-btns{display:flex;gap:6px;flex:none}
.q-mini{flex:none;min-width:34px;border:1px solid var(--line);cursor:pointer;padding:5px 9px;border-radius:8px;background:var(--brand-soft);color:var(--brand);font-size:11px;font-weight:700;line-height:1.4}
.q-mini.primary{background:var(--brand);color:#fff}
.q-analysis{margin:10px 0 12px}
.q-analysis .analysis{margin-top:0}
.opt-row{display:flex;gap:6px;align-items:flex-start}
.opt-row .opt{flex:1;min-width:0}
.opt-trans{margin:-2px 0 8px 29px;padding:7px 10px;border-radius:9px;background:var(--ok-soft);font-size:12px;line-height:1.6;color:var(--ink2)}
.qt-row{display:flex;gap:9px;padding:7px 0;border-bottom:1px dashed var(--line);font-size:12.5px;line-height:1.65}
.qt-row b{flex:none;width:34px;color:var(--brand);font-weight:800}
.qt-row span{color:var(--ink2)}
.step-card>.ref-block{margin:14px 0 0}
html[data-theme="dark"] .qt-row{border-color:var(--line2)}
html[data-theme="dark"] .opt-trans,html[data-theme="dark"] .sc-trans{color:var(--ink)}