.ai4u-sub .b4-page{padding:32px 0;margin:0;color:var(--ink);scroll-margin-top:100px}
.b4-page .b4-inner{width:min(calc(100% - 48px),1120px);margin:0 auto;min-width:0}
.b4-page .b4-eyebrow{margin:0 0 16px;font-size:12px;font-weight:800;letter-spacing:.14em;color:#3154bb}
.b4-page .b4-title{font-size:clamp(40px,4.4vw,66px);line-height:1.18;letter-spacing:-.055em;margin:0 0 28px}
.b4-page .b4-heading{font-size:clamp(28px,3vw,44px);line-height:1.35;letter-spacing:-.055em;margin:0;max-width:900px}
.b4-page .b4-lead{margin:24px 0 16px;color:#35476c;font-weight:600}.b4-page .b4-body{margin:0;color:#435474;max-width:900px}
.ai4u-sub .b4-bg-wash{background:var(--wash)}
.b4-page .b4-layout{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:48px;align-items:center}.b4-page .b4-copy,.b4-page .b4-support-panel{min-width:0}
.b4-page :is(ul,ol){list-style:none;padding:0;margin:32px 0 0}.b4-page li{margin:0;line-height:1.85;font-size:17px;min-width:0}
.b4-page .b4-support-panel{background:#fff;border-left:3px solid #a9b8f3;padding:24px 28px;transition:border-color .6s ease}
.b4-page .b4-tabs{margin:0 0 24px;gap:16px;display:flex;flex-wrap:wrap}.b4-page .b4-tab .wp-block-button__link{border:1px solid #94a8dd;background:#fff;color:#2448ac;border-radius:7px;font-size:16px;padding:12px 20px;min-height:48px;transition:background .2s ease,color .2s ease}.b4-page .b4-tab [aria-selected="true"]{background:var(--blue);color:#fff;border-color:var(--blue)}
.b4-page .b4-panel{border-left:2px solid #a9b8f3;padding:16px 20px;margin:0 0 24px}.b4-page .b4-panel:last-child{margin-bottom:0}.b4-page .b4-panel-copy{margin:0}.b4-page .b4-panel[hidden]{display:none}
.b4-page .b4-product-support{margin-top:32px;border-top:2px solid #a9b8f3;padding-top:24px}
.b4-page .b4-disclosure{margin-top:32px}.b4-page .b4-detail{border-top:1px solid #aabce4;margin:0;padding:20px 0}.b4-detail summary{cursor:pointer;font-size:17px;line-height:1.85;font-weight:600}.b4-page .b4-detail-copy{margin:24px 0 0;color:#435474}
.b4-page :is(.b4-preparation,.b4-materials){border-left:3px solid #a9b8f3;padding:24px 28px}.b4-page .b4-questions{margin:0}.b4-questions li+li{margin-top:28px}.b4-page .b4-materials{background:#fff;border-left-style:dashed}
.b4-page .b4-collaboration{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px;counter-reset:step}.b4-collaboration li{counter-increment:step;border-top:2px solid #a9b8f3;padding:24px 0;position:relative;transition:border-color .6s ease}.b4-collaboration li:before{content:counter(step,decimal-leading-zero);display:block;font-size:15px;font-weight:800;color:var(--blue);margin-bottom:16px}.b4-collaboration li:not(:last-child):after{content:"→";position:absolute;right:-24px;top:22px;color:#3154bb}
.b4-page .b4-request-stack{border-left:2px solid #a9b8f3;padding-left:28px}.b4-page .b4-layers{margin:0}.b4-layers li{padding:24px 0}.b4-layers li+li{border-top:1px solid #c8d5f4}
.b4-page .b4-faq-network{margin-top:32px;border-left:2px solid #a9b8f3;padding-left:28px}.b4-page .b4-network{margin:0}.b4-network li{position:relative;padding:20px 24px;border-bottom:1px solid #c8d5f4}.b4-network li:before{content:"";position:absolute;left:-36px;top:28px;width:12px;height:12px;border-radius:50%;background:#fff;border:2px solid var(--blue)}
.b4-page .b4-final{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px}.b4-final li{border-top:1px solid #aabce4;padding-top:24px}.b4-page .b4-actions{margin-top:32px}.b4-page a:not(.wp-block-button__link){color:#2448c2;text-decoration:underline;text-underline-offset:4px}.b4-page :is(a,summary):focus-visible{outline:3px solid #778fea;outline-offset:5px}
.b4-page.b4-active :is(.b4-support-panel,.b4-collaboration li){border-color:var(--blue)}.b4-page .reveal{animation:b4-entry .6s ease-out both}
@keyframes b4-entry{from{transform:translateY(12px);opacity:.85}to{transform:none;opacity:1}}
@media(max-width:900px){.b4-page .b4-layout{grid-template-columns:1fr;gap:32px}.b4-page .b4-collaboration{grid-template-columns:1fr;gap:24px}.b4-collaboration li:not(:last-child):after{content:none}}
@media(max-width:580px){.ai4u-sub .b4-page{padding:24px 0}.b4-page .b4-inner{width:calc(100% - 40px)}.b4-page .b4-final{grid-template-columns:1fr;gap:24px}.b4-page li{font-size:15px}.b4-page .b4-support-panel{padding:24px 20px}.b4-page :is(.b4-preparation,.b4-materials){padding:24px 20px}.b4-page .b4-tabs{gap:12px}.b4-page .b4-tab .wp-block-button__link{padding:12px 16px}.b4-page .b4-network li{padding:20px 0}}
@media(prefers-reduced-motion:reduce){.b4-page .reveal{animation:none}.b4-page :is(.b4-support-panel,.b4-collaboration li,.b4-tab .wp-block-button__link){transition:none}}