:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--paper:#f4f6ef;--surface:#fffefb;--ink:#173c38;--muted:#6a817d;--teal:#16877c;--teal-deep:#0c5d56;--line:#ccded8;--danger:#a13f3f;--shadow:0 24px 70px #1441391a}*{box-sizing:border-box}html,body{min-height:100%}body{background:radial-gradient(circle at 92% 4%, #a7d8cd7a, transparent 35%), linear-gradient(180deg, #fbfcf7 0%, var(--paper) 100%);color:var(--ink);-webkit-font-smoothing:antialiased;margin:0;font-family:Inter,Noto Sans SC,Microsoft YaHei,sans-serif}button,textarea{font:inherit}button{-webkit-tap-highlight-color:transparent}.student-shell{width:min(100%,520px);min-height:100dvh;padding:max(22px, env(safe-area-inset-top)) 18px max(24px, env(safe-area-inset-bottom));flex-direction:column;margin:0 auto;display:flex}.brand{align-items:center;gap:11px;min-height:44px;display:flex}.brand-mark{border-radius:12px;width:38px;height:38px;display:block;overflow:hidden;box-shadow:0 8px 25px #16877c38}.brand-mark 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h1{letter-spacing:-.04em;margin:0;font-family:Songti SC,STSong,serif;font-size:clamp(38px,11vw,50px);font-weight:600}.room-entry-card>p:not(.eyebrow){color:var(--muted);margin:12px 0 28px;line-height:1.7}.room-entry-card label{margin-bottom:10px;font-size:14px;font-weight:750;display:block}.room-entry-card input{border:1px solid var(--line);width:100%;min-height:62px;color:var(--ink);letter-spacing:.18em;background:#fff;border-radius:16px;outline:none;padding:12px 16px;font-size:26px;font-weight:700}.room-entry-card input:focus{border-color:var(--teal);box-shadow:0 0 0 4px #16877c1a}.room-entry-card input::placeholder{color:#a6b5b1;letter-spacing:.08em;font-size:20px;font-weight:500}.entry-help,.entry-error{min-height:21px;color:var(--muted);margin:8px 2px 16px;font-size:12px}.entry-error{color:var(--danger)}.room-entry-card .send-button span{margin-left:8px;font-size:20px}.recent-room{border:0;border-top:1px solid var(--line);width:100%;color:var(--muted);cursor:pointer;font:inherit;background:0 0;justify-content:space-between;margin-top:18px;padding:14px 4px 0;font-size:13px;display:flex}.recent-room strong{color:var(--teal-deep);letter-spacing:.08em}@media (min-width:700px){.student-shell{padding-top:42px;padding-bottom:42px}.room-hero{padding-top:64px}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important}}.teacher-shell{width:min(100% - 32px,1200px);min-height:100dvh;margin:0 auto;padding:24px 0 48px}.teacher-header{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;margin-bottom:24px;padding-bottom:16px;display:flex}.header-user{align-items:center;gap:12px;display:flex}.user-badge{color:var(--teal-deep);border:1px solid var(--line);background:#eef7f3;border-radius:999px;padding:6px 14px;font-size:13px;font-weight:600}.text-btn{color:var(--muted);cursor:pointer;background:0 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