.ipas-refero-root{--ipas-shell-max:72rem;--ipas-reading-max:54rem;--ipas-shell-padding-inline:clamp(1rem, 3vw, 1.5rem);--ipas-shell-gap:2rem;--ipas-header-row-height:3.25rem;--ipas-tabs-row-height:2.75rem}.ipas-shell__inner{width:min(100%, var(--ipas-shell-max));padding-inline:var(--ipas-shell-padding-inline);margin-inline:auto}.ipas-shell__header{z-index:40;border-bottom:1px solid var(--border-soft);background:var(--nav-bg);-webkit-backdrop-filter:blur(.75rem);backdrop-filter:blur(.75rem);position:sticky;top:0}.ipas-shell__header-inner{grid-template-areas:"brand utility""nav nav";align-items:center;gap:.75rem 1rem;padding-block:.625rem;display:grid}.ipas-shell__header-inner--exam{grid-template-areas:"brand utility""switcher switcher"}.ipas-shell__brand{min-height:var(--ipas-header-row-height);min-width:0;color:var(--text-primary);letter-spacing:-.01em;white-space:nowrap;grid-area:brand;align-items:center;font-size:1rem;font-weight:600;line-height:1.2;text-decoration:none;display:inline-flex}.ipas-primary-nav{grid-area:nav;min-width:0}.ipas-primary-nav__list{flex-wrap:wrap;align-items:center;gap:.5rem;display:flex}.ipas-shell__switcher-slot{grid-area:switcher;min-width:0}.ipas-primary-nav__link,.ipas-level-switcher__link,.ipas-auth-link{border:1px solid var(--border-soft);background:color-mix(in srgb, var(--text-primary) 2%, transparent);min-width:0;min-height:2.375rem;color:var(--text-secondary);text-align:center;white-space:nowrap;word-break:keep-all;overflow-wrap:normal;border-radius:999px;justify-content:center;align-items:center;padding-inline:.875rem;font-size:.9375rem;font-weight:500;line-height:1;text-decoration:none;transition:color .16s,background-color .16s,border-color .16s;display:inline-flex}.ipas-primary-nav__link[data-active=true],.ipas-level-switcher__link[data-active=true]{color:var(--nav-active-text);background:var(--nav-active-bg);border-color:var(--nav-active-bg)}.ipas-level-switcher{min-width:0}.ipas-segmented{align-items:center;gap:8px;display:inline-flex}.ipas-segmented>:is(a,button,label){text-align:center;border-radius:var(--radius-sm,14px);cursor:pointer;border:none;min-width:0;padding:8px 20px;font-size:15px;font-weight:600;text-decoration:none;transition:background .12s,color .12s}.ipas-segmented>.ref-btn-primary{background:var(--accent-warm);color:#fff}.ipas-segmented>.ref-btn-secondary{color:var(--text-muted);background:0 0;padding:8px 12px}.ipas-segmented>.ref-btn-secondary:hover{color:var(--text-primary)}.ipas-choice-grid>:is(a,button,label){width:100%;min-width:0}.ipas-level-switcher__link{padding-inline:.75rem}.ipas-shell__section-row{border-top:1px solid var(--border-soft);overflow-x:hidden}.ipas-primary-nav__link:hover,.ipas-level-switcher__link:hover,.ipas-auth-link:hover,.ipas-shell__utility-link:hover,.ipas-subnav__link:hover{color:var(--nav-text-hover)}.ipas-shell__utility{justify-content:flex-end;align-items:center;gap:.5rem;min-width:0;display:flex}.ipas-shell__utility-links{justify-content:flex-end;align-items:center;gap:.25rem;display:none}.ipas-shell__utility-link{min-height:2.375rem;color:var(--text-secondary);border-radius:999px;justify-content:center;align-items:center;padding-inline:.625rem;font-size:.9375rem;font-weight:500;line-height:1;text-decoration:none;transition:color .16s,background-color .16s;display:inline-flex}.ipas-shell__utility-link[data-active=true]{background:color-mix(in srgb, var(--text-primary) 4%, transparent);color:var(--text-primary)}.ipas-auth-slot,.ipas-auth-group{justify-content:flex-end;align-items:center;gap:.5rem;min-width:0;display:flex}.ipas-auth-link,.ipas-auth-group>:is(a,button){text-overflow:ellipsis;flex:0 auto;max-width:min(14rem,48vw);overflow:hidden}.ipas-shell__utility button[aria-label*=色彩模式]{border:1px solid var(--border-soft);background:color-mix(in srgb, var(--text-primary) 2%, transparent);border-radius:999px;width:2.75rem;min-width:2.75rem;height:2.75rem;min-height:2.75rem}.ipas-main{max-width:var(--ipas-shell-max);padding-block:1.75rem 2.75rem}.ipas-subnav{scrollbar-width:none;-webkit-overflow-scrolling:touch;max-width:100%;margin:0;overflow:auto hidden}.ipas-subnav::-webkit-scrollbar{display:none}.ipas-subnav__list{align-items:center;gap:.375rem;min-width:max-content;padding-block:.3125rem;display:inline-flex}.ipas-subnav__link{min-width:0;min-height:var(--ipas-tabs-row-height);color:var(--text-secondary);white-space:nowrap;word-break:keep-all;overflow-wrap:normal;flex:none;align-items:center;padding-inline:.875rem;font-size:.9375rem;font-weight:500;line-height:1;text-decoration:none;display:inline-flex;position:relative}.ipas-subnav__link:after{content:"";background:0 0;border-radius:999px;height:.125rem;position:absolute;bottom:.375rem;left:.875rem;right:.875rem}.ipas-subnav__link[data-active=true]{color:var(--text-primary);font-weight:600}.ipas-subnav__link[data-active=true]:after{background:var(--text-primary)}.ipas-choice-grid{grid-template-columns:1fr;gap:1rem;display:grid}.ipas-chip-row{flex-wrap:wrap;gap:.5rem;display:flex}.ipas-chip-row>*{flex:none;max-width:100%}.ipas-action-row{flex-wrap:wrap;gap:.75rem;display:flex}.ipas-action-row>*{flex:none}.ipas-template-pre-hero{margin-bottom:1rem}.ipas-template-hero:not(:empty){margin-bottom:2rem}.ipas-template-body{color:var(--text-primary)}.ipas-template-body>*+*{margin-top:var(--ipas-shell-gap)}[data-refero] .ipas-main h1,[data-refero] .ipas-main .display-title{letter-spacing:-.02em;text-wrap:balance;font-size:clamp(2rem,5.8vw,3rem);line-height:1.12}[data-refero] .ipas-main h2,[data-refero] .ipas-main .h2-spec{text-wrap:balance;font-size:clamp(1.625rem,4vw,2rem);line-height:1.24}[data-refero] .ipas-main h3{font-size:1.375rem;line-height:1.35}[data-refero] .ipas-main .page-hero{max-width:var(--ipas-shell-max);margin-top:.75rem;margin-bottom:1.5rem}[data-refero] .ipas-main .page-hero>:is(.eyebrow,h1){max-width:var(--ipas-reading-max)}[data-refero] .ipas-main .page-hero p,[data-refero] .ipas-main .ref-card>p{max-width:var(--ipas-reading-max);text-wrap:pretty}[data-refero] .ipas-main .section>p,[data-refero] .ipas-main .page-hero p{max-width:var(--ipas-shell-max);text-wrap:auto}[data-refero].ipas-refero-root .ipas-main .page-hero p{max-width:var(--ipas-shell-max)}[data-refero] .ipas-main .section{margin-block:2rem}[data-refero] .ipas-main .section+.section{margin-top:2.5rem}[data-refero] .ipas-main .ref-card{padding:clamp(1.125rem,3vw,1.5rem)}[data-refero] .ipas-main .ref-card p,[data-refero] .ipas-main .ref-card li{line-height:1.7}[data-refero] .ipas-main .ipas-helper,[data-refero] .ipas-main .ipas-meta{color:var(--text-secondary);font-size:.9375rem;line-height:1.65}[data-refero] .ipas-main .ipas-kicker{color:var(--text-muted);font-size:.8125rem;font-weight:500;line-height:1.4}[data-refero] .ipas-main .ipas-price{font-family:var(--font-sans);color:var(--text-primary);font-size:1.375rem;font-weight:500;line-height:1.35}[data-refero] .ipas-main .ipas-price-note{color:var(--text-muted);font-size:.8125rem;line-height:1.5}[data-refero] .ipas-main .ipas-deepdive-actions{flex-wrap:wrap;gap:.75rem;margin-top:1.5rem;display:flex}[data-refero] .ipas-main .ipas-deepdive-feature{border:1px solid var(--cta-bg);border-radius:var(--shape-radius);background:var(--cta-bg);color:var(--cta-text);padding:1.5rem}[data-refero] .ipas-main .ipas-deepdive-feature h3,[data-refero] .ipas-main .ipas-deepdive-feature p{color:inherit}[data-refero] .ipas-main .ipas-deepdive-feature__helper{color:color-mix(in srgb, var(--cta-text) 78%, transparent)!important}[data-refero] .ipas-main .ipas-deepdive-feature .ref-btn-primary{background:var(--bg-card);border-color:var(--bg-card);color:var(--text-primary)}[data-refero] .ipas-main .ipas-deepdive-feature .ref-btn-primary:hover{background:color-mix(in srgb, var(--bg-card) 92%, var(--cta-text))}[data-refero] .ipas-main .ipas-deepdive-feature .ref-btn-secondary{border-color:color-mix(in srgb, var(--cta-text) 35%, transparent);color:var(--cta-text);background:0 0}[data-refero] .ipas-main .ipas-deepdive-feature .ref-btn-secondary:hover{background:color-mix(in srgb, var(--cta-text) 12%, transparent)}[data-refero] .ipas-main .ipas-feature-grid{gap:1.5rem;display:grid}[data-refero] .ipas-main .ipas-faq-list{gap:.75rem;display:grid}[data-refero] .ipas-main .ipas-faq-item summary{box-sizing:border-box;cursor:pointer;min-block-size:44px;color:var(--text-primary);padding-block:.625rem;list-style:none}[data-refero] .ipas-main details>summary{box-sizing:border-box;min-block-size:44px;padding-block:.625rem}[data-refero] .ipas-main .ipas-faq-item summary::-webkit-details-marker{display:none}[data-refero] .ipas-main .ipas-faq-question{font-family:var(--font-sans);justify-content:space-between;align-items:center;gap:1rem;font-size:1.125rem;font-weight:500;line-height:1.45;display:flex}[data-refero] .ipas-main .ipas-faq-question:after{content:"+";color:var(--text-muted);flex:none;font-size:1.25rem;line-height:1}[data-refero] .ipas-main .ipas-faq-item[open] .ipas-faq-question:after{content:"−"}[data-refero] .ipas-main #learner-status-card{gap:1.125rem;padding:1.25rem;display:grid}[data-refero] .ipas-main #learner-status-card .heading-row,[data-refero] .ipas-main #learner-status-body{grid-column:1}[data-refero] .ipas-main #learner-status-card .card-text-spec{max-width:var(--ipas-reading-max);font-size:.875rem;line-height:1.6}[data-refero] .ipas-main #learner-status-cta{flex-wrap:wrap;gap:.625rem;padding:0;display:flex}@media (width>=40rem){.ipas-shell__utility-links{display:flex}.ipas-main{padding-block:2rem 3rem}}@media (width>=48rem){.ipas-shell__header-inner{grid-template-columns:auto minmax(0,1fr) auto;grid-template-areas:"brand nav utility";gap:1rem;padding-block:.25rem}.ipas-shell__header-inner--exam{grid-template-areas:"brand switcher utility"}.ipas-primary-nav{justify-self:center;width:100%}.ipas-primary-nav__link,.ipas-level-switcher__link,.ipas-auth-link,.ipas-shell__utility-link,.ipas-subnav__link{min-height:2.25rem}.ipas-primary-nav__list{justify-content:center}.ipas-shell__utility{flex-wrap:nowrap}.ipas-subnav__list{padding-block:0}.ipas-choice-grid{grid-template-columns:repeat(2,minmax(0,1fr))}[data-refero] .ipas-main #learner-status-card{grid-template-columns:minmax(0,1fr) minmax(15rem,auto);align-items:center;gap:1.125rem 2rem;padding:1.75rem 2rem}[data-refero] .ipas-main #learner-status-cta{grid-area:1/2/span 2;place-self:center end;width:min(100%,17.5rem)}[data-refero] .ipas-main .progress-empty__actions{justify-items:stretch;min-width:16rem}}@media (width<=39.99rem){.ipas-shell__brand{display:none}.ipas-shell__header-inner{grid-template-columns:1fr auto;grid-template-areas:"nav utility";gap:0 .5rem;padding-block:.5rem}.ipas-shell__header-inner--exam{grid-template-columns:1fr auto;grid-template-areas:"switcher utility"}.ipas-primary-nav__list{flex-wrap:nowrap;gap:.25rem}.ipas-primary-nav__link,.ipas-level-switcher__link{min-height:2.75rem;padding-inline:.625rem;font-size:.8125rem}.ipas-shell__utility-links,.ipas-auth-slot{display:none}.ipas-shell__utility{gap:.25rem}[data-refero] .ipas-main .ref-card :is(p,li){font-size:1rem}[data-refero] .ipas-main .ipas-action-row>:is(a,button),[data-refero] .ipas-main .ipas-deepdive-actions>:is(a,button),[data-refero] .ipas-main .progress-empty__cta,[data-refero] .ipas-main #learner-status-cta>:is(a,button){width:100%}[data-refero] .ipas-main .ipas-faq-question{align-items:flex-start;font-size:1.0625rem}[data-refero] .ipas-main .ipas-deepdive-actions,.ipas-action-row{gap:.625rem;display:grid}}