.tut-shell-nav{z-index:9999;background:#071a3e;border-bottom:1px solid #ffffff1f;font-family:DM Sans,sans-serif;position:sticky;top:0}.tut-shell-nav-main{align-items:center;gap:16px;height:56px;padding:0 24px;display:flex}.tut-shell-brand{color:#fff;white-space:nowrap;font-family:Playfair Display,serif;font-size:16px;font-weight:700;text-decoration:none}.tut-shell-brand span{color:#7ec8ff}.tut-shell-home{color:#ffffffb8;white-space:nowrap;border:1px solid #ffffff2e;border-radius:999px;margin-left:auto;padding:6px 12px;font-size:12px;font-weight:700;text-decoration:none}.tut-shell-home:hover{color:#fff;border-color:#ffffff59}.tut-shell-links{scrollbar-width:none;-webkit-overflow-scrolling:touch;align-items:center;gap:4px;padding:0 24px 10px;display:flex;overflow-x:auto}.tut-shell-links::-webkit-scrollbar{display:none}.tut-shell-links a{color:#ffffff9e;white-space:nowrap;border-radius:8px;flex:none;padding:7px 11px;font-size:12px;font-weight:700;text-decoration:none;transition:all .15s}.tut-shell-links a:hover{color:#fff;background:#ffffff1a}.tut-shell-page{background:#f0f4fa;min-height:calc(100vh - 96px)}.tut-shell-frame{background:#fff;border:none;width:100%;height:calc(100vh - 96px);display:block}.tut-shell-index{max-width:1100px;margin:0 auto;padding:32px 28px 80px}.tut-shell-title{color:#0b1f4b;margin-bottom:8px;font-family:Playfair Display,serif;font-size:30px}.tut-shell-sub{color:#5a7090;margin-bottom:24px;font-size:14px}.tut-shell-grid{grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px;display:grid}.tut-shell-card{color:#0b1f4b;background:#fff;border:1.5px solid #dde8f4;border-radius:16px;padding:22px;font-weight:700;text-decoration:none}.tut-shell-card:hover{border-color:#1a5fb4}.tut-shell-card span{color:#8ba8cc;margin-top:8px;font-size:12px;font-weight:500;display:block}@media (max-width:900px){.tut-shell-nav-main{padding:0 18px}.tut-shell-links{padding:0 18px 10px}}@media (max-width:700px){.tut-shell-nav-main{gap:10px;height:52px;padding:0 14px}.tut-shell-brand{text-overflow:ellipsis;max-width:62vw;font-size:14px;overflow:hidden}.tut-shell-home{padding:5px 10px;font-size:11px}.tut-shell-links{gap:3px;padding:0 14px 9px}.tut-shell-links a{padding:6px 9px;font-size:11px}.tut-shell-page{min-height:calc(100vh - 89px)}.tut-shell-frame{height:calc(100vh - 89px)}.tut-shell-index{padding:24px 16px 60px}.tut-shell-title{font-size:26px}.tut-shell-grid{grid-template-columns:1fr}}@media (max-width:380px){.tut-shell-brand{max-width:56vw;font-size:13px}.tut-shell-home{padding:5px 8px;font-size:10px}}.tut-section-stack{flex-direction:column;gap:34px;display:flex}.tut-section{background:#ffffff73;border:1.5px solid #dde8f4;border-radius:18px;padding:22px}.tut-section-head{justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:18px;display:flex}.tut-section-title{color:#0b1f4b;margin:0 0 6px;font-family:Playfair Display,serif;font-size:24px}.tut-section-sub{color:#5a7090;margin:0;font-size:13px;line-height:1.6}@media (max-width:700px){.tut-section{border-radius:16px;padding:16px}.tut-section-stack{gap:22px}.tut-section-head{margin-bottom:14px}.tut-section-title{font-size:21px}}