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var(--border-color)}.subtopic3-title{font-size:1.5rem;font-weight:700}.subtopic3-arrows{display:flex;gap:16px}.subtopic3-arrows-bottom{justify-content:space-evenly;background:var(--content-footer-color);padding:12px 0;border-radius:12px;margin:8px 0 0;flex-shrink:0;display:flex}.subtopic3-arrows-bottom .arrow-btn,.subtopic3-arrows-bottom .arrow-btn-startend{flex:1 1 0;margin:0 4px;font-size:64px;width:64px;height:64px}.subtopic3-arrow-btn,.subtopic3-arrow-btn-startend{border:none;color:var(--content-text-color);border-radius:50%;font-size:72px;width:72px;height:72px;cursor:pointer;display:flex;align-items:center;justify-content:center}.subtopic3-arrow-btn-top-left{border:none;color:var(--content-text-color);border-radius:50%;font-size:54px;width:54px;height:54px;cursor:pointer;display:flex;align-items:center;justify-content:center;border:1px solid #fff;background:var(--background-arrow-btn-top-left)}.subtopic3-body{background:var(--background1-color);flex:1 1 auto;overflow:auto;min-height:0;display:flex;align-items:center;justify-content:center;padding-bottom:0}.subtopic3-img{width:100%;height:100%;aspect-ratio:16 / 9;object-fit:fill;display:block}.subtopic3-title-group{display:flex;align-items:center;gap:16px}@media (max-width: 600px) and (orientation: portrait){.subtopic3-header{padding:8px}.subtopic3-img{width:100%;height:100%;object-fit:contain}.desktop-only{display:none}.mobile-only{display:flex}.subtopic3-arrows-bottom{margin-top:4px;padding:8px 0;border-bottom:none;border-radius:0!important}.page-indicator{margin-top:4px}}@media (min-width: 601px) and (max-width: 1024px){.subtopic3-header{padding:8px;min-height:10px}.subtopic3-title{font-size:1rem}.subtopic3-img{width:100%;height:100%;object-fit:contain}.subtopic3-arrows-bottom{padding:16px 0;border-bottom:none;border-radius:0!important}.page-indicator{min-height:30px;margin-top:4px}.dot{width:8px;height:8px;margin:0 6px;border-radius:50%;background:var(--content-dot-inactive-color);transition:background .3s,transform .3s}.desktop-only{display:none}.mobile-only{display:flex}.subtopic3-arrow-btn-top-left{border:none;color:var(--content-text-color);border-radius:50%;font-size:36px;width:36px;height:36px;cursor:pointer;display:flex;align-items:center;justify-content:center;border:1px solid #fff;background:var(--background-arrow-btn-top-left)}.subtopic3-arrow-btn,.subtopic3-arrow-btn-startend{border:none;color:var(--content-text-color);border-radius:50%;font-size:36px;width:36px;height:36px;cursor:pointer;display:flex;align-items:center;justify-content:center}}@media (max-width: 932px) and (orientation: landscape){.subtopic3-body,.scroll-img-container{flex:1 1 auto!important;min-height:0!important;overflow:auto!important}.subtopic3-img{width:100%!important;max-width:100%!important;height:auto!important;object-fit:contain!important;display:block!important}}@media (min-width: 933px) and (max-width: 1366px) and (orientation: landscape){.subtopic3-body,.scroll-img-container{display:flex!important;align-items:center!important;justify-content:center!important;height:100%!important;min-height:0!important}.subtopic3-img{width:100%!important;max-width:100%!important;height:auto!important;object-fit:contain!important;display:block!important}}html,body{margin:0;padding:0;min-height:100vh;min-height:100dvh;min-height:100svh;overflow:auto}.subtopic4-container{width:100%;height:100%;display:flex;flex-direction:column;box-sizing:border-box;overflow:hidden;padding-top:max(env(safe-area-inset-top,16px));padding-bottom:max(env(safe-area-inset-bottom,16px));padding-left:max(env(safe-area-inset-left,16px));padding-right:max(env(safe-area-inset-right,16px))}.subtopic4-header{background:var(--content-header-color);color:var(--content-text-color);display:flex;align-items:center;justify-content:space-between;padding:16px 24px;flex-shrink:0;border-top:none;border-bottom:6px solid var(--border-color)}.subtopic4-title{font-size:1.5rem;font-weight:700}.subtopic4-arrows{display:flex;gap:16px}.subtopic4-arrows-bottom{justify-content:space-evenly;background:var(--content-footer-color);padding:12px 0;border-radius:12px;margin:8px 0 0;flex-shrink:0;display:flex}.subtopic4-arrows-bottom .arrow-btn,.subtopic4-arrows-bottom .arrow-btn-startend{flex:1 1 0;margin:0 4px;font-size:64px;width:64px;height:64px}.subtopic4-arrow-btn,.subtopic4-arrow-btn-startend{border:none;color:var(--content-text-color);border-radius:50%;font-size:72px;width:72px;height:72px;cursor:pointer;display:flex;align-items:center;justify-content:center}.subtopic4-arrow-btn-top-left{border:none;color:var(--content-text-color);border-radius:50%;font-size:54px;width:54px;height:54px;cursor:pointer;display:flex;align-items:center;justify-content:center;border:1px solid #fff;background:var(--background-arrow-btn-top-left)}.arrow-btn:hover{background:var(--hover-button-color)}.subtopic4-body{background:var(--background1-color);flex:1 1 auto;overflow:auto;min-height:0;display:flex;align-items:center;justify-content:center;padding-bottom:0}.subtopic4-img{width:100%;height:100%;aspect-ratio:16 / 9;object-fit:fill;display:block}.scroll-img-container{width:100%;height:100%;overflow:auto}.subtopic4-title-group{display:flex;align-items:center;gap:16px}.page-indicator{background:var(--background1-color)!important;border:none!important;display:flex;justify-content:center;align-items:center;margin-top:8px;flex-shrink:0;min-height:48px;padding:0}.dot{width:12px;height:12px;margin:0 6px;border-radius:50%;background:var(--content-dot-inactive-color);transition:background .3s,transform .3s}.dot.active{background:var(--content-dot-active-color);transform:scale(1.2)}.button-group{display:flex;gap:16px;margin:16px}.body-title{font-size:2rem;color:var(--text-color);margin-bottom:16px}.body-button{padding:12px 24px;font-size:16px;border-radius:8px;border:none;background:#27ae60;color:#fff;cursor:pointer;transition:background .2s}.body-text{font-size:1.2rem;color:var(--text-color);text-align:center;margin-bottom:24px}.desktop-only{display:flex}.mobile-only{display:none}@media (max-width: 600px) and (orientation: portrait){.subtopic4-header{padding:8px}.subtopic4-img{width:100%;height:100%;object-fit:contain}.desktop-only{display:none}.mobile-only{display:flex}.subtopic4-arrows-bottom{margin-top:4px;padding:8px 0;border-bottom:none;border-radius:0!important}.page-indicator{margin-top:4px}}@media (min-width: 601px) and (max-width: 1024px){.subtopic4-header{padding:8px;min-height:10px}.subtopic4-title{font-size:1rem}.subtopic4-img{width:100%;height:100%;object-fit:contain}.subtopic4-arrows-bottom{padding:16px 0;border-bottom:none;border-radius:0!important}.page-indicator{min-height:30px;margin-top:4px}.dot{width:8px;height:8px;margin:0 6px;border-radius:50%;background:var(--content-dot-inactive-color);transition:background .3s,transform .3s}.desktop-only{display:none}.mobile-only{display:flex}.subtopic4-arrow-btn-top-left{border:none;color:var(--content-text-color);border-radius:50%;font-size:36px;width:36px;height:36px;cursor:pointer;display:flex;align-items:center;justify-content:center;border:1px solid #fff;background:var(--background-arrow-btn-top-left)}.subtopic4-arrow-btn,.subtopic4-arrow-btn-startend{border:none;color:var(--content-text-color);border-radius:50%;font-size:36px;width:36px;height:36px;cursor:pointer;display:flex;align-items:center;justify-content:center}}@media (max-width: 932px) and (orientation: landscape){.subtopic4-body,.scroll-img-container{flex:1 1 auto!important;min-height:0!important;overflow:auto!important}.subtopic4-img{width:100%!important;max-width:100%!important;height:auto!important;object-fit:contain!important;display:block!important}}@media (min-width: 933px) and (max-width: 1366px) and (orientation: landscape){.subtopic4-body,.scroll-img-container{display:flex!important;align-items:center!important;justify-content:center!important;height:100%!important;min-height:0!important}.subtopic4-img{width:100%!important;max-width:100%!important;height:auto!important;object-fit:contain!important;display:block!important}}