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.stage-period{color:var(--chapter);font-size:10px;line-height:1.35;font-weight:800}
@media(max-width:620px){.difficulty-options button{min-height:100px}}
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.topbar{position:sticky;top:0;z-index:30;backdrop-filter:blur(12px)}
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@media(max-width:620px){.topbar{gap:6px}.audio-button{width:32px;height:32px;font-size:19px}.audio-panel{right:-3px}}
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@media(max-width:1060px){.study-layout{grid-template-columns:205px minmax(0,1fr)}.study-flow-steps{grid-template-columns:1fr}.study-terms dl{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:850px){.study-nav-progress{display:none}.study-layout{grid-template-columns:1fr}.study-index{position:static;max-height:190px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:5px 12px}.study-index-group+.study-index-group{margin-top:0}.study-home-teaser{align-items:start}}
@media(max-width:620px){.side-nav{grid-template-columns:repeat(5,minmax(0,1fr))}.study-home-teaser{padding:19px;display:block}.study-teaser-actions{justify-items:start;margin-top:16px}.study-page-heading{padding:23px}.study-index{display:block}.study-lesson-head{padding:23px 20px}.study-lesson-meta{display:block}.study-lesson-meta span{display:block;margin-bottom:4px}.study-lesson-head p{font-size:16px}.study-lesson-body{padding:21px 17px}.study-flow-steps p{font-size:13px}.study-terms dl{grid-template-columns:1fr}.study-lesson-actions .button{width:100%;font-size:12px}.study-neighbors button{font-size:11px}.study-home-teaser p{font-size:12px}}
.study-flow-steps p{font-size:16px}.study-terms dd{font-size:14px}.study-curiosity p,.study-check>p{font-size:16px}.study-check [id="study-check-answer"] p{font-size:15px}.study-note,.study-sources a{font-size:12px}.study-index-item{min-height:44px}.study-check button,.study-neighbors button{min-height:44px}
@media(max-width:620px){.study-flow-steps p{font-size:16px}.study-home-teaser p{font-size:14px}.study-teaser-fact p{font-size:14px}}
.study-deep{margin-top:30px;padding:clamp(24px,4vw,44px);border:1px solid #789eaa;border-left:5px solid #8ce4d2;border-radius:12px;background:radial-gradient(circle at 100% 0,#3c628044,transparent 44%),#183349}
.study-deep-head{padding-bottom:24px;border-bottom:1px solid #567385}
.study-deep h3{margin:8px 0 7px;font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:clamp(25px,3vw,34px);line-height:1.4}
.study-deep-head p{margin:0;color:#bbd5df;font-size:14px;line-height:1.7}
.study-deep-chapter{padding:30px 0 4px}
.study-deep-chapter+.study-deep-chapter{border-top:1px solid #49677b;margin-top:20px}
.study-deep-chapter-title{display:flex;align-items:baseline;gap:14px;max-width:42em;margin-bottom:15px}
.study-deep-chapter-title span{flex:none;color:#8fe3d1;font-size:14px;font-weight:900;letter-spacing:.08em}
.study-deep-chapter h4{margin:0;color:#fff;font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:clamp(20px,2.1vw,25px);line-height:1.5}
.study-deep-chapter p{max-width:42em;margin:0;color:#edf5fa;font-size:17px;line-height:1.95;letter-spacing:.015em;overflow-wrap:anywhere}
.study-deep-chapter p+p{margin-top:1em}
.study-deep-source{display:flex;gap:8px 16px;align-items:baseline;flex-wrap:wrap;margin-top:27px;padding-top:18px;border-top:1px solid #567385}
.study-deep-source span{color:#bbd5df;font-size:13px;font-weight:800}
.study-deep-source a{color:#bcf8e5;font-size:14px;line-height:1.7;text-underline-offset:3px}
.study-deep-source a:hover{color:#fff}
@media(max-width:620px){.study-deep{padding:24px 18px}.study-deep-chapter{padding-top:25px}.study-deep-chapter-title{gap:10px}.study-deep-chapter p{font-size:16px;line-height:1.86}.study-deep-chapter h4{font-size:21px}}