*{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#14171e; --panel:#262a33; --panel2:#2f343f; --line:#3c424f;
  --txt:#e9ecf3; --dim:#8b93a6;
  --blue:#5b8cf0; --red:#e03a63; --green:#2ecc71; --purple:#8257e6; --amber:#f2b134;
  --ac:var(--blue);
}
html,body{min-height:100%}
body{background:var(--bg);color:var(--txt);
  font-family:"Comic Sans MS","Chalkboard SE","Comic Neue","Segoe UI",system-ui,sans-serif;
  -webkit-text-size-adjust:100%}
button{font:inherit}
/* 顶部语言条 */
.topbar{background:#0d0f14;border-bottom:1px solid #1b1f27;padding:10px 16px;
  display:flex;align-items:center;justify-content:space-between}
.topbar .brand{font-size:15px;font-weight:600;color:#e9ecf3;text-decoration:none}

/* 语言下拉菜单 */
.langbar{position:relative;display:inline-block}
.lang-toggle{display:flex;align-items:center;gap:6px;padding:6px 12px;
  background:#1e2836;border:1px solid #3c424f;border-radius:8px;color:#e9ecf3;
  cursor:pointer;font-size:14px;transition:all .15s}
.lang-toggle:hover{background:#2a3441;border-color:#5d6578}
.lang-toggle svg{width:16px;height:16px;transition:transform .2s}
.langbar.open .lang-toggle svg{transform:rotate(180deg)}
.lang-menu{position:absolute;top:calc(100% + 4px);right:0;
  background:#262a33;border:1px solid #3c424f;border-radius:8px;
  box-shadow:0 8px 24px rgba(0,0,0,.4);min-width:140px;
  opacity:0;pointer-events:none;transform:translateY(-8px);
  transition:all .2s;z-index:100}
.langbar.open .lang-menu{opacity:1;pointer-events:auto;transform:translateY(0)}
.lang-menu a{display:flex;align-items:center;justify-content:space-between;
  padding:10px 14px;color:#9ca3af;text-decoration:none;font-size:14px;
  transition:all .15s;border-bottom:1px solid #1b1f27}
.lang-menu a:last-child{border-bottom:0}
.lang-menu a:hover{background:#2f343f;color:#e9ecf3}
.lang-menu a[aria-current]{color:#fff;font-weight:600}
.lang-menu a[aria-current]::after{content:'✓';color:#5b8cf0}

.app{display:flex;gap:16px;max-width:1200px;margin:0 auto;padding:16px;align-items:flex-start}

/* 左侧导航 */
.sidebar{width:176px;flex:none;display:flex;flex-direction:column;gap:4px;padding-top:40px}
.nav{display:flex;align-items:center;gap:12px;width:100%;background:none;border:0;text-decoration:none;
  color:var(--dim);cursor:pointer;padding:9px 8px;border-radius:12px;font-size:18px;text-align:left}
.nav svg{width:40px;height:40px;flex:none}
.nav:hover{color:var(--txt);background:#1c202a}
.nav.on{color:#fff}
.nav .arrow{margin-left:auto;width:22px;height:22px;opacity:0}
.nav.on .arrow{opacity:1}
.nav:focus-visible{outline:3px solid var(--amber);outline-offset:2px}

/* 主舞台 */
.stage{flex:1;min-width:0;background:var(--panel);border-radius:10px;
  box-shadow:0 12px 34px #0007;overflow:hidden}
.hidden{display:none !important}

/* 使用说明 */
.hint{margin:0;padding:11px 16px 9px;font-size:13px;color:#7b8592;text-align:center;
  line-height:1.5;background:#1a1e26;border-bottom:1px solid #1b1f27}
/* 限时模式：顶部时长选择 */
.timer-choices{display:flex;align-items:center;justify-content:center;gap:18px;padding:14px 18px;
  background:linear-gradient(90deg,#202632,#293142,#202632);border-top:1px solid #39445a;
  border-bottom:2px solid #46536c;box-shadow:inset 0 -1px 0 #11151d}
.timer-choice-title{font-size:17px;color:#f3f4f6;font-weight:700;white-space:nowrap}
.timer-choice-title span{color:var(--amber);font-size:21px;vertical-align:-1px}
.timer-choice-options{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap}
.timer-choice{min-width:92px;min-height:44px;padding:9px 18px;border:2px solid #526078;border-radius:10px;
  background:#313a4b;color:#e5e7eb;font:inherit;font-size:15px;font-weight:700;cursor:pointer;
  transition:transform .15s,background .15s,border-color .15s,box-shadow .15s}
.timer-choice:hover{background:#414d63;border-color:#8090ad;transform:translateY(-1px)}
.timer-choice.on{background:var(--blue);border-color:#8db1ff;color:#fff;
  box-shadow:0 0 0 2px #5b8cf044,0 4px 14px #5b8cf077}
.timer-choice:focus-visible{outline:3px solid var(--amber);outline-offset:2px}
/* 固定题量模式 */
.goal-choices{display:flex;align-items:center;justify-content:center;gap:18px;padding:14px 18px;
  background:linear-gradient(90deg,#1e302b,#274138,#1e302b);border-top:1px solid #3b6655;
  border-bottom:2px solid #4d806b;box-shadow:inset 0 -1px 0 #11151d}
.goal-choice-title{font-size:17px;color:#f3f4f6;font-weight:700;white-space:nowrap}
.goal-choice-title span{display:inline-grid;place-items:center;width:25px;height:25px;border-radius:50%;
  background:var(--green);color:#10261d;font-size:17px;margin-right:3px}
.goal-choice-options{display:flex;align-items:center;justify-content:center;gap:9px;flex-wrap:wrap}
.goal-choice,.goal-start{min-width:72px;min-height:44px;padding:9px 16px;border:2px solid #527363;
  border-radius:10px;background:#30483e;color:#eaf8f1;font:inherit;font-size:15px;font-weight:700;cursor:pointer}
.goal-choice:hover,.goal-start:hover{background:#3c5c4e;border-color:#78aa92;transform:translateY(-1px)}
.goal-choice.on{background:var(--green);border-color:#91e9bb;color:#10261d;
  box-shadow:0 0 0 2px #31d17c44,0 4px 14px #31d17c66}
.goal-custom{display:flex;gap:6px;align-items:center}
.goal-custom input{width:112px;min-height:44px;border:2px solid #527363;border-radius:10px;
  background:#18251f;color:#fff;padding:8px 10px;font:inherit;font-size:14px;text-align:center}
.goal-custom input:focus{outline:3px solid var(--amber);outline-offset:1px}
.goal-start{min-width:68px;background:#287b53;border-color:#54c58d}
.goal-choice:focus-visible,.goal-start:focus-visible{outline:3px solid var(--amber);outline-offset:2px}

/* 运算符行 */
.ops{display:grid;grid-template-columns:repeat(4,1fr);background:var(--panel2)}
.op{background:none;border:2px dotted transparent;cursor:pointer;padding:14px 0;
  display:grid;place-items:center}
.op svg{width:84px;height:84px}
.op:hover{background:#343a47}
.op.on{border-color:#7f8aa3;background:#333945}
.op:focus-visible{outline:3px solid var(--amber);outline-offset:-3px}
/* 难度选择条 */
.ranges{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;padding:20px 14px 16px;
  background:var(--panel);border-bottom:1px solid #1b1f27}
.rg{flex:1 1 auto;min-width:120px;max-width:180px;background:linear-gradient(135deg,#2b303b,#232833);
  border:3px solid #3d4354;border-radius:12px;color:#9ca3af;cursor:pointer;
  padding:14px 20px;font-size:20px;font-weight:700;white-space:nowrap;text-align:center;
  transition:all .2s;box-shadow:0 2px 8px rgba(0,0,0,.3)}
.rg:hover{color:#e5e7eb;border-color:#5d6578;transform:translateY(-2px);
  box-shadow:0 4px 12px rgba(0,0,0,.4)}
.rg.on{color:#fff;background:linear-gradient(135deg,var(--ac),#3d4354);
  border-color:var(--ac);box-shadow:0 4px 16px rgba(91,140,240,.4),0 0 20px rgba(91,140,240,.2)}
.rg:focus-visible{outline:3px solid var(--amber);outline-offset:2px}

/* 顶部横幅（计时模式） */
.banner{border:2px dotted #5d6578;margin:10px;border-radius:6px;padding:16px 20px;
  display:flex;align-items:center;gap:22px;background:#2b303b}
.banner svg{width:76px;height:76px;flex:none;opacity:.5}
.banner .btxt{flex:1;text-align:center;line-height:1.9;font-size:21px}
.banner b{color:var(--amber);font-size:30px}

/* 题目区 */
.board{padding:20px 14px 6px}
.probs{display:flex;justify-content:space-around;align-items:flex-start;gap:10px;min-height:168px}
.prob{flex:1 1 0;display:flex;justify-content:center;opacity:.45;transition:opacity .25s}
.prob.cur{opacity:1}
.stack{display:inline-grid;grid-template-columns:auto auto;column-gap:.3em;
  justify-content:center;align-items:baseline}
.prob .n1,.prob .sy,.prob .nb{font-size:46px;line-height:1.1;color:var(--ac);font-weight:700;
  font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}
.prob .n1,.prob .nb{text-align:right}
.prob .n1{grid-column:2;grid-row:1}
.prob .sy{grid-column:1;grid-row:2}
.prob .nb{grid-column:2;grid-row:2}
.prob .rule{grid-column:1/-1;justify-self:stretch;height:3px;background:var(--ac);
  border-radius:2px;margin-top:6px;min-width:96px}
.prob .slot{grid-column:1/-1;justify-self:stretch;margin-top:12px;height:58px;min-width:96px;
  border:2px solid transparent;border-radius:8px;display:grid;place-items:center;
  font-size:38px;font-weight:700;color:#fff;font-variant-numeric:tabular-nums}
.prob.cur .slot{border-color:var(--ac);background:#1e222b}
.prob.ok .slot{border-color:var(--green);background:#14361f;color:#aef3c6;animation:pop .32s}
.prob.no .slot{border-color:var(--red);background:#3a1522;color:#ffc2d1;animation:shake .32s}
.prob .fix{grid-column:1/-1;justify-self:stretch;margin-top:7px;font-size:15px;
  color:var(--green);min-height:20px;text-align:center}
@keyframes pop{0%{transform:scale(1)}45%{transform:scale(1.14)}100%{transform:scale(1)}}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-7px)}75%{transform:translateX(7px)}}

/* 数字盘 */
.pad{display:grid;gap:4px;padding:10px 14px 14px}
.pad.g10{grid-template-columns:repeat(10,1fr)}
.pad.g5{grid-template-columns:repeat(5,1fr)}
.key{background:#2b303b;border:1px solid var(--line);color:var(--txt);cursor:pointer;
  padding:14px 0;font-size:26px;font-weight:700;border-radius:4px;min-height:52px}
.key:hover{background:#3a414f}
.key:active{background:var(--ac);color:#fff;transform:translateY(1px)}
.key.wide{grid-column:span 2}
.key.go{background:#1f4a2c;border-color:#2c6b3f}
.key.del{background:#45232f;border-color:#6b2c3f}
.key:focus-visible{outline:3px solid var(--amber);outline-offset:-3px}

/* 状态条 */
.status{display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  border-top:1px solid #1b1f27;background:#22262f;padding:9px 14px;font-size:15px}
.chip{display:flex;align-items:center;gap:6px;background:#2b303b;border-radius:999px;padding:5px 13px}
.chip b{font-size:18px}
.gap{flex:1}
.btn{background:#333a47;border:1px solid var(--line);color:var(--txt);cursor:pointer;
  border-radius:999px;padding:7px 16px;font-size:15px}
.btn:hover{background:#3f4756}
.btn.main{background:var(--blue);border-color:var(--blue);color:#fff;font-weight:700}
.btn.danger{background:#4a2230;border-color:#6b2c3f}
.btn:focus-visible{outline:3px solid var(--amber);outline-offset:2px}
.foot{text-align:center;color:#5e667a;font-size:13px;padding:8px}
.home-seo-intro{padding:22px 24px 18px;border-bottom:1px solid #343b49;background:linear-gradient(135deg,#252b36,#20242d)}
.home-seo-intro h1{margin:0 0 8px;color:#fff;font-size:30px;line-height:1.2}
.home-seo-intro p{max-width:820px;color:#aeb8ca;font-size:15px;line-height:1.65}
.site-footer{display:flex;align-items:flex-start;justify-content:flex-start;text-align:left;padding:18px 22px;background:#171a21;border-top:1px solid #303744}
.site-footer>div{display:flex;flex-direction:column;gap:4px}
.site-footer a{color:#eef2f8;font-weight:800;text-decoration:none}
.site-footer span{color:#7f899c;line-height:1.5}
/* 首页底部：醒目的使用说明 */
.how-to{display:flex;align-items:flex-start;gap:18px;margin:22px 18px 16px;padding:22px 24px;
  background:linear-gradient(135deg,#263247,#202a3a);border:2px solid #5b8cf0;border-radius:14px;
  box-shadow:0 8px 24px #0005,0 0 22px #5b8cf026}
.how-icon{display:grid;place-items:center;flex:none;width:54px;height:54px;border-radius:50%;
  background:var(--blue);border:3px solid #9abaff;color:#fff;font-size:32px;font-weight:800;
  box-shadow:0 4px 14px #5b8cf077}
.how-content{min-width:0;flex:1}
.how-content h2{margin:0 0 10px;color:#fff;font-size:23px;line-height:1.25}
.how-text{color:#cbd5e1;font-size:15px;line-height:1.9}
.how-text br{display:block;content:"";margin-top:5px}
.how-text b{color:#fff}

/* English home content follows the practice controls and stays readable in every view. */
.home-seo-copy{padding:30px 24px 34px;background:#20242d;color:#cbd3df;line-height:1.75}
.home-seo-copy section{max-width:900px;padding:0 0 20px}
.home-seo-copy section+section{padding-top:10px}
.home-seo-copy h2{margin:0 0 10px;color:#fff;font-size:22px;line-height:1.35}
.home-seo-copy p{margin:0;color:#aeb8c8}
.home-seo-copy ul,.home-seo-copy ol{margin:0;padding-left:24px;color:#aeb8c8;display:grid;gap:8px}
.home-seo-copy li{padding-left:5px}
.home-seo-copy strong{color:#fff}
.home-seo-copy a{color:#a9c3ff}

/* 成绩 / 关于 */
.page{padding:20px}
.page h2{font-size:24px;margin-bottom:14px;display:flex;align-items:center;gap:10px}
.page h3{font-size:18px;margin:18px 0 8px;color:var(--dim)}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px}
.card{background:var(--panel2);border-radius:10px;padding:14px;text-align:center}
.card .v{font-size:30px;font-weight:700;color:var(--ac)}
.card .k{font-size:13px;color:var(--dim);margin-top:3px}
table{width:100%;border-collapse:collapse;font-size:15px}
th,td{padding:9px 10px;text-align:left;border-bottom:1px solid var(--line)}
th{color:var(--dim);font-weight:400;font-size:13px}
.empty{color:var(--dim);padding:18px 0;text-align:center}
.review-empty{min-height:260px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;text-align:center;color:var(--dim)}
.review-empty-icon{display:grid;place-items:center;width:58px;height:58px;border-radius:50%;background:#203d34;border:2px solid #3c8d6b;color:#8ef0b2;font-size:31px;font-weight:700}
.review-empty p{max-width:420px;line-height:1.6}
.worksheet-page{padding:22px 24px 28px}
.worksheet-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:20px}
.worksheet-heading h2{margin:0 0 7px}
.worksheet-heading h1{margin:0 0 7px;font-size:28px;line-height:1.25;color:#fff}
.worksheet-heading p{margin:0;color:var(--dim);line-height:1.55;max-width:720px}
.worksheet-builder{display:grid;grid-template-columns:minmax(380px,1fr) minmax(330px,.82fr);gap:28px;align-items:start}
.worksheet-controls{min-width:0}
.worksheet-controls fieldset{border:0;padding:0;margin:0 0 20px;min-width:0}
.worksheet-controls legend,.worksheet-form-grid label>span{display:block;color:#dce4f0;font-size:13px;font-weight:700;margin-bottom:8px}
.ws-segments{display:flex;flex-wrap:wrap;gap:7px}
.ws-segments button{min-height:42px;border:1px solid #465166;background:#262c38;color:#cbd5e1;border-radius:7px;padding:8px 15px;font:inherit;font-weight:700;cursor:pointer}
.ws-segments button:hover{background:#303847;border-color:#60708b}
.ws-segments button.on{background:#315f50;border-color:#52b788;color:#fff;box-shadow:inset 0 0 0 1px #52b788}
.ws-operations button{min-width:88px}
.ws-operations button:first-child{color:#8eb5ff}.ws-operations button:nth-child(2){color:#ff91ad}
.ws-operations button:nth-child(3){color:#72e6a5}.ws-operations button:nth-child(4){color:#ba9bff}
.ws-operations button.on{color:#fff}
.worksheet-form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-bottom:18px}
.worksheet-form-grid label{min-width:0}
.worksheet-form-grid input,.worksheet-form-grid select{width:100%;min-height:43px}
.ws-check{display:flex;align-items:flex-start;gap:10px;background:#252c38;border:1px solid #3c4658;border-radius:8px;padding:12px 13px;cursor:pointer}
.ws-check input{width:20px;height:20px;accent-color:#3ca373;margin-top:1px}
.ws-check span{display:flex;flex-direction:column;gap:3px}.ws-check strong{font-size:14px}.ws-check small{color:var(--dim);line-height:1.4}
.worksheet-actions{display:flex;flex-wrap:wrap;gap:9px;margin-top:18px}
.worksheet-actions .btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:46px;padding:9px 17px;font-weight:700}
.worksheet-action-icon{display:block;width:23px;height:23px;flex:none}
#ws-regenerate .worksheet-action-icon{color:#b7d1ff}
#ws-print .worksheet-action-icon{color:#d4dce9}
.worksheet-privacy{margin:12px 0 0;color:#778399;font-size:12px;line-height:1.5}
.worksheet-preview-wrap{position:sticky;top:18px;min-width:0}
.worksheet-preview-label{color:var(--dim);font-size:12px;font-weight:700;text-transform:uppercase;margin-bottom:8px}
.worksheet-paper{position:relative;aspect-ratio:210/297;background:#fff;color:#172033;border-radius:4px;padding:7% 7% 8%;box-shadow:0 12px 28px #0007;overflow:hidden}
.worksheet-paper-brand{color:#276749;font-size:13px;font-weight:800;margin-bottom:5px}
.worksheet-paper-title{display:block;color:#172033;font-size:22px;margin:0 0 13px;line-height:1.2}
.worksheet-paper-lines{display:flex;justify-content:space-between;gap:14px;color:#4b5563;font-size:9px;padding-bottom:9px;border-bottom:1px solid #d9dee7}
.worksheet-preview-meta{font-size:9px;color:#516074;font-weight:700;margin:9px 0 10px}
.worksheet-preview-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:9%;row-gap:10px}
.worksheet-preview-problem{display:grid;grid-template-columns:22px 1fr;align-items:end;font-size:11px;min-width:0}
.worksheet-preview-problem span{color:#7b8492}.worksheet-preview-problem strong{font-size:13px;white-space:nowrap}
.worksheet-preview-problem i{grid-column:2;height:8px;border-bottom:1px solid #8f98a5}
.worksheet-preview-list.is-vertical{grid-template-columns:repeat(4,minmax(0,1fr));column-gap:4%;row-gap:18px}
.worksheet-preview-problem.is-vertical{grid-template-columns:14px minmax(0,1fr);align-items:start;min-height:56px}
.worksheet-preview-stack{min-width:0}
.worksheet-preview-stack>.worksheet-preview-top{display:block;text-align:right;font-size:13px;line-height:16px}
.worksheet-preview-bottom{display:flex;justify-content:space-between;align-items:center;gap:3px;border-bottom:1px solid #8f98a5;padding-bottom:3px;line-height:16px}
.worksheet-preview-bottom b{color:#27364b;font-size:12px;font-weight:800}
.worksheet-preview-bottom strong{font-size:13px}
.worksheet-preview-more{text-align:center;color:#276749;background:#eef7f1;border:1px solid #b9ddc6;border-radius:7px;font-size:14px;font-weight:800;line-height:1.4;margin-top:18px;padding:8px 10px}
.worksheet-preview-more:empty{display:none}
.worksheet-paper-foot{position:absolute;left:7%;right:7%;bottom:3.5%;border-top:1px solid #d9dee7;padding-top:7px;text-align:center;color:#276749;font-size:8px;font-weight:700}
.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:10px}
input[type=text],input[type=number],input[type=date],select{background:#20242e;border:1px solid var(--line);
  color:var(--txt);border-radius:8px;padding:9px 12px;font:inherit;font-size:15px}
input:focus-visible,select:focus-visible{outline:3px solid var(--amber);outline-offset:1px}
label.sw{display:flex;align-items:center;gap:9px;cursor:pointer;font-size:15px;
  background:var(--panel2);border-radius:8px;padding:9px 13px}
label.sw input{width:19px;height:19px;accent-color:var(--blue)}
.bad{color:#ff9bb3}
.good{color:#8ef0b2}

/* 独立练习题生成器页面 */
.worksheet-standalone .app{max-width:1400px;padding:22px 16px 34px}
.worksheet-standalone .stage{overflow:visible;width:100%}
.worksheet-standalone .worksheet-page{border-bottom:1px solid #343b49}
.worksheet-breadcrumb{padding:15px 24px 0;color:#8b93a6;font-size:13px;line-height:1.5}
.worksheet-breadcrumb a{color:#a9c3ff;text-decoration:none}
.worksheet-breadcrumb a:hover{text-decoration:underline}
.worksheet-seo-copy{padding:30px 24px 34px;background:#20242d;color:#cbd3df;line-height:1.75}
.worksheet-seo-copy>h2{margin:0 0 14px;color:#fff;font-size:22px;line-height:1.35}
.worksheet-seo-copy>h2:not(:first-child){margin-top:30px}
.worksheet-seo-copy ol{padding-left:23px;display:grid;gap:10px;max-width:900px}
.worksheet-seo-copy li{padding-left:5px}
.worksheet-seo-copy section{max-width:900px;padding:13px 0;border-bottom:1px solid #343b49}
.worksheet-seo-copy h3{margin:0 0 5px;color:#eef2f8;font-size:16px;line-height:1.45}
.worksheet-seo-copy p{margin:0;color:#aeb8c8}
.worksheet-nojs{margin:18px 0 0;padding:12px 14px;border:1px solid #8a6828;background:#3a301d;color:#ffe2a1;line-height:1.55}
.worksheet-standalone .foot{padding:18px;background:#171a21}

/* 结算弹窗 */
.mask{position:fixed;inset:0;background:#000a;display:grid;place-items:center;padding:16px;z-index:9}
.modal{background:var(--panel);border-radius:14px;padding:22px;max-width:520px;width:100%;
  box-shadow:0 20px 50px #000a}
.modal h2{font-size:23px;margin-bottom:14px}
.result-head{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px 14px;margin-bottom:14px}
.result-head h2{margin:0}
.result-level{display:flex;align-items:center;gap:7px;border:1px solid #5f7392;border-radius:999px;
  padding:7px 12px;background:#30394a;color:#dce7f8;font-size:12px;line-height:1;white-space:nowrap}
.result-level span{color:#aebbd0}
.result-level strong{font-size:13px;color:#fff}
.result-level.level-easy{background:#203d34;border-color:#3c8d6b}
.result-level.level-easy strong{color:#8ef0b2}
.result-level.level-medium{background:#493b22;border-color:#a77a2e}
.result-level.level-medium strong{color:#ffd477}
.result-level.level-hard{background:#4a2933;border-color:#a95670}
.result-level.level-hard strong{color:#ff9bb3}
.modal .result-cards{grid-template-columns:repeat(3,minmax(0,1fr))}
.share-panel{grid-column:span 2;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:11px;min-height:90px;padding:13px 14px;background:linear-gradient(135deg,#26384a,#243044);
  border:1px solid #506783;border-radius:10px;text-align:center}
.share-guide{display:flex;align-items:center;justify-content:center;gap:8px;color:#e8eef8;font-size:14px;line-height:1.35}
.share-guide span{display:grid;place-items:center;width:25px;height:25px;border-radius:50%;
  background:#5b8cf0;color:#fff;font-size:17px;flex:none}
.share-row{display:flex;justify-content:center;gap:9px;width:100%}
.share-row .btn{min-height:40px;padding:7px 14px;font-size:13px;font-weight:700;white-space:nowrap}
.goal-total-card{grid-column:1/-1}
.share-download{background:#256d4b;border-color:#45a875;color:#ecfff5}
.share-download:hover{background:#31845e}
.share-copy{background:#334f86;border-color:#5b8cf0;color:#f1f6ff}
.share-copy:hover{background:#4263a2}
.count{position:fixed;inset:0;background:#000c;display:grid;place-items:center;z-index:10;
  font-size:160px;font-weight:700;color:var(--blue)}

@media(max-width:1050px){
  .worksheet-standalone .worksheet-builder{grid-template-columns:1fr}
  .worksheet-standalone .worksheet-preview-wrap{position:static;max-width:540px;width:100%;margin:0 auto}
}
@media(max-width:820px){
  .topbar{flex-direction:column;align-items:stretch;gap:8px;padding:8px 12px}
  .topbar .brand{text-align:center}
  .langbar{justify-content:center;flex-wrap:wrap}
  .app{flex-direction:column;padding:8px;gap:8px}
  .hint{font-size:12px;padding:9px 12px 8px}
  .timer-choices{gap:9px;padding:11px 8px;flex-direction:column}
  .timer-choice-options{gap:6px}
  .timer-choice-title{font-size:15px}
  .timer-choice{min-width:72px;min-height:42px;padding:8px 11px;font-size:13px}
  .goal-choices{gap:9px;padding:11px 8px;flex-direction:column}
  .goal-choice-title{font-size:15px}
  .goal-choice-options{gap:6px}
  .goal-choice,.goal-start{min-width:62px;min-height:42px;padding:8px 10px;font-size:13px}
  .goal-custom input{width:92px;min-height:42px;font-size:13px}
  .how-to{margin:16px 10px 12px;padding:18px 16px;gap:12px}
  .how-icon{width:42px;height:42px;font-size:25px}
  .how-content h2{font-size:20px}
  .how-text{font-size:14px;line-height:1.75}
  .share-row{flex-wrap:wrap}
  .share-row .btn{flex:1 1 130px}
  .share-panel{padding:12px 10px}
  .share-guide{font-size:13px}
  .worksheet-page{padding:18px 14px 24px}
  .worksheet-standalone .app{padding:8px 8px 22px}
  .worksheet-standalone .sidebar{align-self:stretch}
  .worksheet-standalone .sidebar .nav{flex:0 0 auto;width:auto;white-space:nowrap}
  .worksheet-breadcrumb{padding:13px 14px 0}
  .worksheet-seo-copy{padding:25px 16px 28px}
  .worksheet-builder{grid-template-columns:1fr;gap:24px}
  .worksheet-preview-wrap{position:static;max-width:540px;width:100%;margin:0 auto}
  .sidebar{width:100%;flex-direction:row;padding:0;gap:4px;overflow-x:auto}
  .nav{justify-content:center;font-size:14px;padding:8px 10px}
  .nav svg{width:26px;height:26px}
  .nav .arrow{display:none}
  .op svg{width:52px;height:52px}
  .prob{display:none}
  .prob.cur{display:flex}
  .prob .n1,.prob .sy,.prob .nb{font-size:56px}
  .prob .rule,.prob .slot{min-width:130px}
  .key{font-size:23px;padding:16px 0;min-height:58px}
  .banner svg{display:none}
}
@media(max-width:520px){
  .modal .result-cards{grid-template-columns:repeat(2,minmax(0,1fr))}
  .share-panel,.goal-total-card{grid-column:1/-1}
  .worksheet-form-grid{grid-template-columns:1fr}
  .worksheet-heading h1{font-size:24px}
  .worksheet-actions .btn{flex:1 1 135px}
  .ws-segments button{flex:1 1 92px;padding:8px 10px}
  .home-seo-intro{padding:18px 16px 15px}
  .home-seo-intro h1{font-size:25px}
  .worksheet-paper{aspect-ratio:auto;min-height:420px;padding-bottom:56px}
  .worksheet-paper-title{font-size:18px}
}
@media print{
  .sidebar,.langbar,.hint,.timer-choices,.goal-choices,.ranges,.ops,.pad,.status,.how-to,.foot,#overlay{display:none !important}
  body{background:#fff;color:#000}
  .stage{box-shadow:none}
  .card{border:1px solid #ccc}
  .card .v{color:#000}
}