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var(--blue)}.linc-gate-btn{flex:none}.linc-gate-error{color:var(--warn);font-weight:700;font-size:.88rem;margin:12px 0 0}@media(max-width:440px){.linc-gate-form{flex-direction:column}}.article-kickrow{display:flex;align-items:center;gap:12px}.article-pic{flex:none;width:24px;height:24px;display:inline-flex;align-items:center;justify-content:center}.article-pic svg{width:24px;height:24px;stroke:var(--ink);fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}.article-end{display:flex;align-items:center;gap:18px;margin:44px 0 8px}.article-end:before,.article-end:after{content:"";flex:1;height:1px;background:var(--line)}.article-end svg{flex:none;width:20px;height:20px;stroke:var(--blue);fill:none;stroke-width:2.4;stroke-linecap:round}.topic-card .tc-pic{flex:none;width:24px;height:24px;display:inline-flex;align-items:center;justify-content:center}.topic-card .tc-pic svg{width:24px;height:24px;stroke:var(--ink);fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}.topic-card:hover .tc-pic svg{stroke:#fff}.topic-card .tc-title{flex:1}[dir=rtl] body{text-align:right}[dir=rtl] .msg.user{align-self:flex-start}[dir=rtl] .msg.bot{align-self:flex-end}.callout.practice{border:2px solid var(--blue)}.callout.practice>strong{color:var(--blue)}.hdr-share{flex:none;width:34px;height:34px;display:inline-flex;align-items:center;justify-content:center;padding:0;border:1.5px solid var(--ink);border-radius:var(--radius);background:#fff;color:var(--ink);cursor:pointer;transition:background .12s,color .12s}.hdr-share:hover{background:var(--ink);color:#fff}.hdr-share i{font-size:15px;line-height:1}.linc-toast{position:fixed;inset-inline-start:50%;bottom:92px;z-index:90;transform:translate(-50%) translateY(8px);background:#fff;color:var(--ink);border:2px solid var(--ink);border-radius:var(--radius);padding:10px 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svg{width:26px;height:26px;stroke:var(--ink);fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;transition:stroke .12s}.hb-text{display:flex;flex-direction:column;gap:2px;min-width:0}.hb-title{font-weight:800;font-size:1.02rem;letter-spacing:-.02em;color:var(--ink)}.hb-sub{color:var(--gray);font-size:.9rem;line-height:1.4}.hb-arrow{flex:none;margin-inline-start:auto}.hb-arrow svg{width:22px;height:22px;stroke:var(--ink);fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transition:stroke .12s}[dir=rtl] .helper-banner .hb-arrow svg{transform:scaleX(-1)}.gt-btn>i{font-size:15px;line-height:1}.gt-btn[aria-pressed=true]{background:var(--ink);color:#fff;box-shadow:inset 0 0 0 1.5px var(--ink)}.gt-sbs{position:relative}.gt-sbs>summary{list-style:none}.gt-sbs>summary::-webkit-details-marker{display:none}.gt-sbs>summary::marker{content:""}.gt-sbs .gt-caret{font-size:11px;transition:transform .15s}.gt-sbs[open] 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8px}.sbs-lang{font-weight:800;font-size:.92rem;letter-spacing:.02em;color:var(--ink)}.sbs-close{flex:none;width:28px;height:28px;display:inline-flex;align-items:center;justify-content:center;padding:0;border:1.5px solid var(--line2);border-radius:var(--radius);background:#fff;color:var(--ink);font-size:16px;line-height:1;cursor:pointer}.sbs-close:hover{border-color:var(--ink);background:var(--ink);color:#fff}.sbs-note{font-size:.82rem;color:var(--gray);line-height:1.45;margin:0 0 12px}@media(min-width:980px){.sbs-grid{grid-template-columns:1fr 1fr}.sbs-col{border-inline-start:1px solid var(--line);padding-inline-start:36px;margin-inline-start:36px}.sbs-col .sbs-head{border-top:0;padding-top:0;margin-top:0}.article.sbs-on{max-width:none}}.page-head{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.page-head>h1{margin:0}.hd-doodle{flex:none;display:inline-flex;align-items:center;justify-content:center}.hd-doodle 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.tier-meter{transform:rotate(1.4deg)}.tm-bar{width:7px;border-radius:3px 3px 2px 2px;background:var(--line2)}.tm-bar:nth-child(1){height:9px}.tm-bar:nth-child(2){height:17px}.tm-bar:nth-child(3){height:25px}.tier-meter[data-level=higher] .tm-bar{background:var(--blue)}.tier-meter[data-level=mid] .tm-bar:nth-child(1),.tier-meter[data-level=mid] .tm-bar:nth-child(2){background:var(--blue)}.tier-meter[data-level=lower] .tm-bar:nth-child(1){background:var(--blue)}.tier-body{min-width:0}.tier-label{display:block;font-weight:800;font-size:.98rem;letter-spacing:-.02em;color:var(--ink)}.tier-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:9px}.tier-chip{font-size:.9rem;font-weight:600;padding:6px 14px;border-radius:999px;color:var(--ink);background:#fff;box-shadow:inset 0 0 0 2px var(--line)}.tier-caption{margin:16px 0 0;padding-top:14px;border-top:2px dashed var(--line2);color:var(--gray);font-size:.9rem;line-height:1.5}@media(max-width:520px){.tier-row{gap:14px}.tier-diagram{padding:16px}}.footer-mark{display:flex;align-items:center;gap:14px;margin:0 0 18px}.footer-mark:before,.footer-mark:after{content:"";flex:1;border-top:2px dashed var(--line)}.footer-mark svg{flex:none;width:34px;height:26px}.plan-check{flex:none;display:inline-flex;width:18px;height:18px;margin-inline-end:7px;vertical-align:-3px}.plan-check svg{width:18px;height:18px;stroke:var(--blue);fill:none;stroke-width:2.6;stroke-linecap:round;stroke-linejoin:round}