.language-switch{top:max(12px,env(safe-area-inset-top));right:max(16px,env(safe-area-inset-right));z-index:45;border:1px solid var(--border,#dce5f3);background:var(--card,#fff);width:88px;min-height:44px;color:var(--foreground,#183c73);cursor:pointer;border-radius:12px;justify-content:center;align-items:center;gap:8px;padding:8px 12px;font:600 15px/1.2 Inter,Microsoft YaHei,sans-serif;display:flex;position:fixed;box-shadow:0 2px 8px #183c730a}.language-switch svg{flex-shrink:0;width:20px;height:20px}.language-switch:hover{border-color:var(--primary,#2563eb)}.language-switch:focus-visible{outline:3px solid var(--primary,#2563eb);outline-offset:3px}.app-shell .app-main>.topbar{padding-right:128px}.profile-page{padding-top:80px!important}body .management-shell>main,body .admin-login{padding-top:80px}@media (width<=1100px){.app-shell .app-main>.topbar{grid-template-columns:minmax(0,1fr) 88px;gap:8px 12px;height:auto;min-height:72px;padding:10px 16px;display:grid}.app-shell .topbar>.global-search,.app-shell .topbar>.workspace-breadcrumb{grid-column:1;min-width:0;min-height:44px}.app-shell .topbar>.dse-countdown-group{grid-area:2/1/auto/-1}}@media (width<=800px){body .auth-page.login-page{padding-top:80px}body .management-shell>aside{padding-top:76px}}.tutoring-view{max-width:960px;margin:auto}.tutoring-view>p{color:var(--muted-foreground);margin:12px 0 24px}.tutoring-form,.tutoring-thread{border:1px solid var(--border,#ddd);background:var(--card,#fff);border-radius:16px;margin:18px 0;padding:24px}.tutoring-view label{gap:8px;margin-bottom:16px;font-weight:600;display:grid}.tutoring-view input,.tutoring-view select,.tutoring-view textarea{border:1px solid var(--border,#ccc);background:var(--background,#fff);width:100%;color:inherit;font:inherit;border-radius:8px;padding:12px}.tutoring-message{white-space:pre-wrap;overflow-wrap:anywhere;margin:16px 0;line-height:1.7}.teacher-reply{background:var(--muted,#eef4ff);border-left:3px solid #2c62cb;border-radius:8px;padding:18px}.tutoring-thread-heading{justify-content:space-between;gap:20px;display:flex}.tutoring-thread small{color:var(--muted-foreground,#666);margin-top:8px;display:block}.mobile-nav{overflow-x:auto}@media (width<=700px){.tutoring-thread-heading{flex-direction:column;gap:8px}.tutoring-form,.tutoring-thread{padding:16px}}.mobile-nav{overflow:visible;grid-template-columns:repeat(7,minmax(0,1fr))!important}.mobile-nav>button{min-width:0!important}.mobile-nav>button>span{overflow-wrap:anywhere;font-size:10px;line-height:1.3}.tutoring-view>h1{font-size:28px;font-weight:700;line-height:1.3}.tutoring-view>h2{margin-top:30px;font-size:21px;font-weight:650}.app-shell .mobile-nav button span{white-space:normal;font-size:11px;line-height:1.3}