.wpsxep-article-content{--wpsxep-gb-shell-surface:#fafbfc;--wpsxep-gb-shell-shadow:none;--wpsxep-gb-card-shadow:none;--wpsxep-gb-stack-gap:clamp(0.55rem,1.2vw,0.9rem);--wpsxep-gb-stack-gap-section:clamp(0.95rem,1.7vw,1.25rem);--wpsxep-gb-stack-gap-quiz:clamp(0.8rem,1.45vw,1.05rem)}.wpsxep-article-content .wpsxep-gb-example-question{--wpsxep-ex-surface:#fafbfc;--wpsxep-ex-border:#e8ecf1;--wpsxep-ex-accent:var(--site-color-primary,#2563eb);margin:0;border:1px solid var(--wpsxep-ex-border);border-left:3px solid var(--wpsxep-ex-accent);border-radius:10px;background:var(--wpsxep-ex-surface);box-shadow:none;overflow:visible}.wpsxep-article-content .wpsxep-gb-example-question__head,.wpsxep-article-content .wpsxep-gb-example-question__label{display:flex;align-items:center;gap:.65rem;padding:.7rem 1rem .55rem;border-bottom:1px solid #eef2f6;background:transparent;font-size:12px;font-weight:600;letter-spacing:.06em;color:#64748b}.wpsxep-article-content .wpsxep-gb-example-question__badge,.wpsxep-article-content .wpsxep-gb-example-question__label{padding:0;border-radius:0;background:none;box-shadow:none;color:var(--site-color-primary,#2563eb);font-size:12px;font-weight:700;letter-spacing:.1em;text-transform:none}.wpsxep-article-content .wpsxep-gb-example-question__meta{font-size:12px;font-weight:500;color:#94a3b8}.wpsxep-article-content .wpsxep-gb-example-question__body{padding:.85rem 1rem 1rem;color:#334155}.wpsxep-article-content .wpsxep-gb-example-answer,.wpsxep-gb-example-question .wpsxep-gb-example-answer{margin-top:.75rem;border:1px solid #e8ecf1;border-radius:8px;background:#f8fafc;overflow:hidden}.wpsxep-article-content .wpsxep-gb-example-answer__toggle,.wpsxep-gb-example-answer__toggle{display:block;width:100%;box-sizing:border-box;margin:0;border:none;background:transparent;text-align:left;font:inherit;cursor:pointer;padding:.55rem .85rem;font-size:13px;font-weight:600;color:var(--site-color-primary,#2563eb);list-style:none;-webkit-user-select:none;-moz-user-select:none;user-select:none}.wpsxep-article-content .wpsxep-gb-example-answer__toggle::-webkit-details-marker,.wpsxep-gb-example-answer__toggle::-webkit-details-marker{display:none}.wpsxep-article-content .wpsxep-gb-example-answer__toggle:before,.wpsxep-gb-example-answer__toggle:before{content:"▸";display:inline-block;margin-right:.35em;transition:transform .15s ease}.wpsxep-article-content .wpsxep-gb-example-answer.is-open .wpsxep-gb-example-answer__toggle:before,.wpsxep-article-content .wpsxep-gb-example-answer[open] .wpsxep-gb-example-answer__toggle:before,.wpsxep-gb-example-answer.is-open .wpsxep-gb-example-answer__toggle:before,.wpsxep-gb-example-answer[open] .wpsxep-gb-example-answer__toggle:before{transform:rotate(90deg)}.wpsxep-article-content .wpsxep-gb-example-answer__body,.wpsxep-gb-example-answer__body{padding:.65rem .85rem .75rem;border-top:1px solid #eef2f6;color:#475569;font-size:inherit}.wpsxep-gb-example-question .q-display .q-choice-tail,.wpsxep-gb-example-question .q-display .wpsxep-choice-tail{display:inline-flex;align-items:baseline;margin-left:.3em}.wpsxep-article-content .wpsxep-gb-exercise-set{margin:0;border:1px solid #e8ecf1;border-left:3px solid var(--site-color-primary,#2563eb);border-radius:10px;background:#fafbfc;box-shadow:none;overflow:visible}.wpsxep-article-content .wpsxep-gb-exercise-set__intro{padding:.7rem 1rem .55rem;border-bottom:1px solid #eef2f6;background:transparent}.wpsxep-article-content .wpsxep-gb-exercise-set__tag{padding:0;border-radius:0;background:none;box-shadow:none;color:var(--site-color-primary,#2563eb);font-size:12px;font-weight:700;letter-spacing:.1em}.wpsxep-article-content .wpsxep-gb-exercise-set__hint{font-size:12px;font-weight:500;color:#94a3b8}.wpsxep-article-content .wpsxep-gb-exercise-set__item{border-top:1px solid #eef2f6;grid-template-columns:2rem minmax(0,1fr)}.wpsxep-article-content .wpsxep-gb-exercise-set__label,.wpsxep-article-content .wpsxep-gb-exercise-set__num{padding:.85rem .35rem .75rem;font-size:13px;font-weight:600;color:#94a3b8;background:transparent;border-right:none;justify-content:flex-start}.wpsxep-article-content .wpsxep-gb-exercise-set__card{padding:.85rem 1rem .95rem .25rem;color:#334155}.wpsxep-article-content .wpsxep-gb-q-stem,.wpsxep-article-content .wpsxep-stem.wpsxep-gb-q-stem{margin-bottom:.65rem;color:#1e293b;line-height:1.75}.wpsxep-article-content .wpsxep-bank-options,.wpsxep-article-content .wpsxep-gb-qopts{list-style:none;margin:.5rem 0 0;padding:0;display:grid;gap:.45rem 1rem}.wpsxep-article-content .wpsxep-stem-blank{border-bottom-color:#94a3b8;min-width:4.5em}.wpsxep-article-content .wpsxep-gb-q-embed.q-display{margin:0;padding:0;border:none;background:transparent;box-shadow:none}.wpsxep-article-content .wpsxep-gb-q-embed .q-meta{display:none}.wpsxep-article-content .wpsxep-gb-q-embed .q-options{margin-top:.5rem}.wpsxep-article-content .wpsxep-gb-q-embed .q-option{padding:.15rem 0;border:none;background:none}.wpsxep-article-content .wpsxep-gb-accordion,.wpsxep-article-content .wpsxep-gb-analysis-panel,.wpsxep-article-content .wpsxep-gb-info-box,.wpsxep-article-content .wpsxep-gb-math-statement,.wpsxep-article-content .wpsxep-gb-tabs{border:1px solid #e8ecf1;border-radius:10px;background:#fafbfc;box-shadow:none;overflow:visible}.wpsxep-article-content .wpsxep-gb-table-wrap{border:1px solid #e8ecf1;border-radius:10px;background:#fff;box-shadow:none;overflow:hidden}.wpsxep-article-content .wpsxep-gb-table{width:100%;max-width:100%;min-width:0}.wpsxep-article-content .wpsxep-gb-table td .wpsxep-table-img,.wpsxep-article-content .wpsxep-gb-table td img{display:inline-block;vertical-align:middle}.wpsxep-article-content .wpsxep-gb-accordion-title,.wpsxep-article-content .wpsxep-gb-info-title,.wpsxep-article-content .wpsxep-gb-math-statement__head{background:transparent;border-bottom:1px solid #eef2f6}.wpsxep-article-content .wpsxep-gb-math-statement__kind{color:var(--site-color-primary,#2563eb);font-size:12px;font-weight:700;letter-spacing:.08em}.wpsxep-article-content .wpsxep-gb-accordion,.wpsxep-article-content .wpsxep-gb-callout,.wpsxep-article-content .wpsxep-gb-example-question,.wpsxep-article-content .wpsxep-gb-table-wrap,.wpsxep-article-content .wpsxep-gb-tabs,.wpsxep-article-content section.wpsxep-gb-exercise-set{max-width:none;margin-left:0;margin-right:0;width:100%}.wpsxep-article-content.wpsxep-gb-rich>*{margin-top:0;margin-bottom:0}.wpsxep-article-content.wpsxep-gb-rich>:is(.wpsxep-gb-paragraph,.wpsxep-gb-table-wrap,.wpsxep-gb-list-block,.wpsxep-gb-callout,.wpsxep-gb-highlights,.wpsxep-gb-pullquote,.wpsxep-gb-reminder,.wpsxep-gb-toc,.wpsxep-gb-embed-post,.wpsxep-gb-cta-button,.wpsxep-gb-countdown,.wpsxep-gb-comment-gate,.wpsxep-gb-vip-gate,.wpsxep-gb-login-gate,.wpsxep-gb-modal,.wpsxep-gb-section-heading,.wpsxep-gb-accordion,.wpsxep-gb-tabs,.wpsxep-gb-info-box,.wpsxep-gb-math-statement,.wpsxep-gb-step-solution,.wpsxep-gb-analysis-panel,.wpsxep-gb-annotation-panel,.wpsxep-gb-bank-answer,.wpsxep-gb-multi-solution,.wpsxep-gb-example-question,.wpsxep-gb-exercise-set,.wpsxep-gb-pdf-viewer,.wpsxep-gb-video,.wpsxep-gb-layout-shell,ol.wpsxep-gb-steps,ol.wpsxep-gb-steps-list,ul.wpsxep-gb-timeline-list){margin-block:0}.wpsxep-article-content.wpsxep-gb-rich>:is(h1,h2,h3,h4,.wpsxep-gb-heading){margin-block:0}.wpsxep-article-content.wpsxep-gb-rich>.wpsxep-gb-section-heading{margin-block:0}.wpsxep-article-content.wpsxep-gb-rich>:is(h1,.wpsxep-gb-section-heading):not(:first-child){margin-top:calc(var(--wpsxep-gb-stack-gap-section) - var(--wpsxep-gb-stack-gap))}.wpsxep-article-content.wpsxep-gb-rich>:is(.wpsxep-gb-example-question,section.wpsxep-gb-exercise-set):not(:first-child){margin-top:calc(var(--wpsxep-gb-stack-gap-quiz) - var(--wpsxep-gb-stack-gap))}.wpsxep-article-content.wpsxep-gb-rich>[id^=article-preview-block-]{margin:0}.wpsxep-article-content .wpsxep-gb-list-block--style-card{border-left-width:3px;border-left-color:color-mix(in srgb,var(--wpsxep-gb-list-marker,#2563eb) 50%,#dbeafe);box-shadow:none;background:#fafbfc;padding:10px 14px 12px}.wpsxep-article-content .wpsxep-gb-list-block--style-card .wpsxep-gb-list-block__item{padding:7px 0 7px 36px}.wpsxep-article-content .wpsxep-gb-list-block--ordered.wpsxep-gb-list-block--style-card .wpsxep-gb-list-block__item:before{top:7px;width:22px;height:22px;font-size:.76rem;box-shadow:0 0 0 2px color-mix(in srgb,var(--wpsxep-gb-list-marker,#2563eb) 18%,transparent)}.wpsxep-article-content .wpsxep-gb-list-block--unordered.wpsxep-gb-list-block--style-card .wpsxep-gb-list-block__item:before{top:13px;width:8px;height:8px;box-shadow:0 0 0 2px color-mix(in srgb,var(--wpsxep-gb-list-marker,#2563eb) 18%,transparent)}.wpsxep-article-content .wpsxep-gb-list-block__title{margin-bottom:6px}.wpsxep-article-content .wpsxep-gb-callout__inner{padding:14px 14px 10px}.wpsxep-article-content .wpsxep-gb-callout__title{margin-top:-26px;margin-bottom:8px}.wpsxep-article-content .wpsxep-gb-comment-gate,.wpsxep-article-content .wpsxep-gb-countdown,.wpsxep-article-content .wpsxep-gb-embed-post,.wpsxep-article-content .wpsxep-gb-highlights,.wpsxep-article-content .wpsxep-gb-layout-shell,.wpsxep-article-content .wpsxep-gb-login-gate,.wpsxep-article-content .wpsxep-gb-pullquote,.wpsxep-article-content .wpsxep-gb-reminder,.wpsxep-article-content .wpsxep-gb-toc,.wpsxep-article-content .wpsxep-gb-vip-gate{box-shadow:none;background:#fafbfc;border:1px solid #e8ecf1;border-left-width:3px}.wpsxep-article-content ol.wpsxep-gb-steps,.wpsxep-article-content ol.wpsxep-gb-steps-list{box-shadow:none;background:#fafbfc;border:1px solid #e8ecf1;border-left:3px solid color-mix(in srgb,var(--wpsxep-accent,#0891b2) 55%,#cbd5e1)}.wpsxep-article-content ul.wpsxep-gb-timeline-list{box-shadow:none;background:#fafbfc;border:1px solid #e8ecf1;border-left:3px solid color-mix(in srgb,var(--wpsxep-accent,#7c3aed) 55%,#cbd5e1)}.wpsxep-article-content .wpsxep-gb-analysis-panel,.wpsxep-article-content .wpsxep-gb-annotation-panel,.wpsxep-article-content .wpsxep-gb-bank-answer,.wpsxep-article-content .wpsxep-gb-info-box,.wpsxep-article-content .wpsxep-gb-math-statement,.wpsxep-article-content .wpsxep-gb-multi-solution,.wpsxep-article-content .wpsxep-gb-step-solution{box-shadow:none;border-left-width:3px}.wpsxep-article-content .wpsxep-gb-accordion{border-left-width:3px}.wpsxep-article-content .wpsxep-gb-modal,.wpsxep-article-content .wpsxep-gb-pdf-viewer,.wpsxep-article-content .wpsxep-gb-tabs,.wpsxep-article-content .wpsxep-gb-video{box-shadow:none}body.dark-theme .wpsxep-article-content,body.darking .wpsxep-article-content,html.darking .wpsxep-article-content{--wpsxep-gb-shell-surface:var(--site-surface-card)}body.dark-theme .wpsxep-article-content .wpsxep-gb-example-question,body.darking .wpsxep-article-content .wpsxep-gb-example-question,html.darking .wpsxep-article-content .wpsxep-gb-example-question{--wpsxep-ex-surface:var(--site-surface-card);--wpsxep-ex-border:var(--site-border);background:var(--site-surface-card);border-color:var(--site-border)}body.dark-theme .wpsxep-article-content .wpsxep-gb-example-question__head,body.darking .wpsxep-article-content .wpsxep-gb-example-question__head,html.darking .wpsxep-article-content .wpsxep-gb-example-question__head{border-bottom-color:var(--site-border);color:var(--site-text-muted)}body.dark-theme .wpsxep-article-content .wpsxep-gb-example-question__meta,body.darking .wpsxep-article-content .wpsxep-gb-example-question__meta,html.darking .wpsxep-article-content .wpsxep-gb-example-question__meta{color:var(--site-text-subtle)}body.dark-theme .wpsxep-article-content .wpsxep-gb-example-question__body,body.darking .wpsxep-article-content .wpsxep-gb-example-question__body,html.darking .wpsxep-article-content .wpsxep-gb-example-question__body{color:var(--site-text-body)}body.dark-theme .wpsxep-article-content .wpsxep-gb-example-answer,body.darking .wpsxep-article-content .wpsxep-gb-example-answer,html.darking .wpsxep-article-content .wpsxep-gb-example-answer{border-color:var(--site-border);background:var(--site-surface-soft)}body.dark-theme .wpsxep-article-content .wpsxep-gb-table-wrap,body.darking .wpsxep-article-content .wpsxep-gb-table-wrap,html.darking .wpsxep-article-content .wpsxep-gb-table-wrap{border-color:var(--site-border);background:var(--site-surface-card)}body.dark-theme .wpsxep-article-content .wpsxep-gb-table td,body.dark-theme .wpsxep-article-content .wpsxep-gb-table th,body.darking .wpsxep-article-content .wpsxep-gb-table td,body.darking .wpsxep-article-content .wpsxep-gb-table th,html.darking .wpsxep-article-content .wpsxep-gb-table td,html.darking .wpsxep-article-content .wpsxep-gb-table th{color:var(--site-text-body)}body.dark-theme .wpsxep-article-content .wpsxep-gb-table--cols-2 td:first-child,body.dark-theme .wpsxep-article-content .wpsxep-gb-table:has(>tbody>tr>td:nth-child(2):last-child) td:first-child,body.darking .wpsxep-article-content .wpsxep-gb-table--cols-2 td:first-child,body.darking .wpsxep-article-content .wpsxep-gb-table:has(>tbody>tr>td:nth-child(2):last-child) td:first-child,html.darking .wpsxep-article-content .wpsxep-gb-table--cols-2 td:first-child,html.darking .wpsxep-article-content .wpsxep-gb-table:has(>tbody>tr>td:nth-child(2):last-child) td:first-child{color:var(--site-text)}body.dark-theme .wpsxep-article-content .wpsxep-gb-accordion,body.dark-theme .wpsxep-article-content .wpsxep-gb-analysis-panel,body.dark-theme .wpsxep-article-content .wpsxep-gb-exercise-set,body.dark-theme .wpsxep-article-content .wpsxep-gb-info-box,body.dark-theme .wpsxep-article-content .wpsxep-gb-math-statement,body.dark-theme .wpsxep-article-content .wpsxep-gb-tabs,body.dark-theme .wpsxep-article-content ol.wpsxep-gb-steps-list,body.dark-theme .wpsxep-article-content ul.wpsxep-gb-timeline-list,body.darking .wpsxep-article-content .wpsxep-gb-accordion,body.darking .wpsxep-article-content .wpsxep-gb-analysis-panel,body.darking .wpsxep-article-content .wpsxep-gb-exercise-set,body.darking .wpsxep-article-content .wpsxep-gb-info-box,body.darking .wpsxep-article-content .wpsxep-gb-math-statement,body.darking .wpsxep-article-content .wpsxep-gb-tabs,body.darking .wpsxep-article-content ol.wpsxep-gb-steps-list,body.darking .wpsxep-article-content ul.wpsxep-gb-timeline-list,html.darking .wpsxep-article-content .wpsxep-gb-accordion,html.darking .wpsxep-article-content .wpsxep-gb-analysis-panel,html.darking .wpsxep-article-content .wpsxep-gb-exercise-set,html.darking .wpsxep-article-content .wpsxep-gb-info-box,html.darking .wpsxep-article-content .wpsxep-gb-math-statement,html.darking .wpsxep-article-content .wpsxep-gb-tabs,html.darking .wpsxep-article-content ol.wpsxep-gb-steps-list,html.darking .wpsxep-article-content ul.wpsxep-gb-timeline-list{border-color:var(--site-border);background:var(--site-surface-card);color:var(--site-text-body)}body.dark-theme .wpsxep-article-content .wpsxep-gb-accordion-title,body.dark-theme .wpsxep-article-content .wpsxep-gb-info-title,body.dark-theme .wpsxep-article-content .wpsxep-gb-math-statement__head,body.darking .wpsxep-article-content .wpsxep-gb-accordion-title,body.darking .wpsxep-article-content .wpsxep-gb-info-title,body.darking .wpsxep-article-content .wpsxep-gb-math-statement__head,html.darking .wpsxep-article-content .wpsxep-gb-accordion-title,html.darking .wpsxep-article-content .wpsxep-gb-info-title,html.darking .wpsxep-article-content .wpsxep-gb-math-statement__head{border-bottom-color:var(--site-border);color:var(--site-text)}body.dark-theme .wpsxep-article-content .wpsxep-gb-accordion-content,body.dark-theme .wpsxep-article-content .wpsxep-gb-info-box__body,body.dark-theme .wpsxep-article-content .wpsxep-gb-math-statement__body,body.darking .wpsxep-article-content .wpsxep-gb-accordion-content,body.darking .wpsxep-article-content .wpsxep-gb-info-box__body,body.darking .wpsxep-article-content .wpsxep-gb-math-statement__body,html.darking .wpsxep-article-content .wpsxep-gb-accordion-content,html.darking .wpsxep-article-content .wpsxep-gb-info-box__body,html.darking .wpsxep-article-content .wpsxep-gb-math-statement__body{color:var(--site-text-body)}body.dark-theme .wpsxep-article-content .wpsxep-stem-blank,body.darking .wpsxep-article-content .wpsxep-stem-blank,html.darking .wpsxep-article-content .wpsxep-stem-blank{border-bottom-color:var(--site-text-muted)}body.dark-theme .wpsxep-article-content .wpsxep-gb-paragraph::-webkit-scrollbar-thumb,body.darking .wpsxep-article-content .wpsxep-gb-paragraph::-webkit-scrollbar-thumb,html.darking .wpsxep-article-content .wpsxep-gb-paragraph::-webkit-scrollbar-thumb{background:rgba(100,116,139,.55)}body.dark-theme .wpsxep-article-content .wpsxep-bank-options .wpsxep-opt-mark,body.dark-theme .wpsxep-article-content .wpsxep-bank-options .wpsxep-opt-text,body.dark-theme .wpsxep-article-content .wpsxep-bank-options li,body.darking .wpsxep-article-content .wpsxep-bank-options .wpsxep-opt-mark,body.darking .wpsxep-article-content .wpsxep-bank-options .wpsxep-opt-text,body.darking .wpsxep-article-content .wpsxep-bank-options li,html.darking .wpsxep-article-content .wpsxep-bank-options .wpsxep-opt-mark,html.darking .wpsxep-article-content .wpsxep-bank-options .wpsxep-opt-text,html.darking .wpsxep-article-content .wpsxep-bank-options li{color:var(--site-text-body)}body.dark-theme .wpsxep-article-content .wpsxep-gb-callout__inner,body.darking .wpsxep-article-content .wpsxep-gb-callout__inner,html.darking .wpsxep-article-content .wpsxep-gb-callout__inner,html[data-theme=dark] .wpsxep-article-content .wpsxep-gb-callout__inner{background:var(--site-surface-card);border-color:color-mix(in srgb,var(--wpsxep-gb-callout-border,#475569) 70%,var(--site-border))}body.dark-theme .wpsxep-article-content .wpsxep-gb-callout__body,body.dark-theme .wpsxep-article-content .wpsxep-gb-callout__body :is(p,li,span,div,ol,ul),body.darking .wpsxep-article-content .wpsxep-gb-callout__body,body.darking .wpsxep-article-content .wpsxep-gb-callout__body :is(p,li,span,div,ol,ul),html.darking .wpsxep-article-content .wpsxep-gb-callout__body,html.darking .wpsxep-article-content .wpsxep-gb-callout__body :is(p,li,span,div,ol,ul),html[data-theme=dark] .wpsxep-article-content .wpsxep-gb-callout__body,html[data-theme=dark] .wpsxep-article-content .wpsxep-gb-callout__body :is(p,li,span,div,ol,ul){color:var(--site-text-body)}body.dark-theme .wpsxep-article-content .wpsxep-gb-callout__body li::marker,body.darking .wpsxep-article-content .wpsxep-gb-callout__body li::marker,html.darking .wpsxep-article-content .wpsxep-gb-callout__body li::marker,html[data-theme=dark] .wpsxep-article-content .wpsxep-gb-callout__body li::marker{color:var(--site-color-primary,#60a5fa)}body.dark-theme .wpsxep-article-content .wpsxep-gb-callout__body .wpsxep-gb-callout-mark,body.dark-theme .wpsxep-article-content .wpsxep-gb-callout__body mark,body.darking .wpsxep-article-content .wpsxep-gb-callout__body .wpsxep-gb-callout-mark,body.darking .wpsxep-article-content .wpsxep-gb-callout__body mark,html.darking .wpsxep-article-content .wpsxep-gb-callout__body .wpsxep-gb-callout-mark,html.darking .wpsxep-article-content .wpsxep-gb-callout__body mark,html[data-theme=dark] .wpsxep-article-content .wpsxep-gb-callout__body .wpsxep-gb-callout-mark,html[data-theme=dark] .wpsxep-article-content .wpsxep-gb-callout__body mark{background:color-mix(in srgb,var(--wpsxep-gb-callout-title-bg,#ffe082) 32%,var(--site-surface-soft));color:var(--site-text-body)}body.dark-theme .wpsxep-article-content .wpsxep-gb-callout__dot,body.darking .wpsxep-article-content .wpsxep-gb-callout__dot,html.darking .wpsxep-article-content .wpsxep-gb-callout__dot,html[data-theme=dark] .wpsxep-article-content .wpsxep-gb-callout__dot{background:color-mix(in srgb,var(--wpsxep-gb-callout-accent,#f0c020) 45%,#fff);box-shadow:0 0 0 1px color-mix(in srgb,var(--wpsxep-gb-callout-accent,#f0c020) 40%,transparent)}