.okv2,.okv2 .ok-shell-loading{background:var(--bg);min-height:100lvh}.okv2 .ok-shell-app{background:var(--bg);min-height:100lvh;display:flex}.okv2 .ok-shell-rail{z-index:var(--z-rail);width:var(--ok-rail-w);background:var(--bg);border-right:1px solid var(--line);flex-direction:column;align-items:center;gap:2px;padding:12px 8px 14px;display:flex;position:fixed;inset:0 auto 0 0}.okv2 .ok-shell-main{min-width:0;min-height:100lvh;margin-left:var(--ok-rail-w);background:var(--bg);flex:1;padding:44px 36px 48px}.okv2 .ok-shell-logo{border-radius:var(--r-md);background:var(--color-brand);width:42px;height:42px;color:var(--ink-0);font-family:var(--font-jp);font-size:22px;font-weight:var(--fw-extrabold);place-items:center;margin-bottom:14px;text-decoration:none;display:grid}.okv2 .ok-shell-item{border-radius:var(--r-md);width:58px;min-height:58px;color:var(--ink-mute);transition:background var(--dur-fast) var(--ease-standard), color var(--dur-fast) var(--ease-standard), transform var(--dur-fast) var(--ease-standard);flex-direction:column;justify-content:center;align-items:center;gap:5px;padding:8px 2px;text-decoration:none;display:flex;position:relative}.okv2 .ok-shell-item:is(button){cursor:pointer;font:inherit;background:0 0;border:0}.okv2 .ok-shell-item:hover{background:var(--ink-50);color:var(--ink)}.okv2 .ok-shell-item:active{transform:scale(.96)}.okv2 .ok-shell-item.active{background:var(--color-brand-soft);color:var(--color-brand-deep)}.okv2 .ok-shell-item svg{width:22px;height:22px;transition:transform var(--dur-fast) var(--ease-standard)}.okv2 .ok-shell-item:hover svg{transform:translateY(-1px)}.okv2 .ok-shell-lang-mark{background:var(--ink-50);width:22px;height:22px;color:var(--ink);font-family:var(--font-display);font-size:14px;font-weight:var(--fw-extrabold);border-radius:8px;place-items:center;line-height:1;display:grid}.okv2 .ok-shell-lang:hover .ok-shell-lang-mark{background:var(--color-brand-soft);color:var(--color-brand-deep)}.okv2 .ok-shell-label{font-size:11px;font-weight:var(--fw-semibold);letter-spacing:.02em;line-height:1;font-family:var(--font-display)}.okv2 .ok-shell-item.active .ok-shell-label{font-weight:var(--fw-bold)}.okv2 .ok-shell-spacer{flex:1}.okv2 .ok-shell-avatar{border:1.5px solid var(--color-warm);background:var(--color-warm-soft);width:40px;height:40px;color:var(--color-warm-deep);font-family:var(--font-jp);font-size:14px;font-weight:var(--fw-bold);transition:transform var(--dur-fast) var(--ease-standard);border-radius:50%;place-items:center;margin-top:8px;text-decoration:none;display:grid}.okv2 .ok-shell-avatar:hover{transform:scale(1.05)}.okv2 .ok-shell-mobile-profile{display:none}@media (max-width:900px){.okv2 .ok-shell-rail{width:72px}.okv2 .ok-shell-main{margin-left:72px;padding:36px 24px 16px}}@media (max-width:720px){.okv2 .ok-shell-rail{width:100%;height:auto;padding:10px 14px calc(10px + env(safe-area-inset-bottom));border-right:0;border-top:1px solid var(--line);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#f5f5faf0;flex-direction:row;justify-content:stretch;inset:auto 0 0}.okv2 .ok-shell-logo,.okv2 .ok-shell-avatar{display:none}.okv2 .ok-shell-item{flex:1 1 0;justify-content:center;max-width:none;min-height:52px}.okv2 .ok-shell-item.active:before{border-radius:999px 999px 0 0;width:auto;height:3px;inset:auto 14px -10px}.okv2 .ok-shell-item-secondary,.okv2 .ok-shell-spacer{display:none}.okv2 .ok-shell-mobile-profile{display:flex}.okv2 .ok-shell-main{margin-left:0;padding:18px 16px 96px}body:has(.ok-lesson-shell) .ok-shell-rail{display:none}body:has(.ok-lesson-shell) .ok-shell-main{padding-bottom:calc(16px + env(safe-area-inset-bottom))}}