:root{color-scheme:light;font-family:Noto Sans SC,PingFang SC,Microsoft YaHei,system-ui,-apple-system,BlinkMacSystemFont,sans-serif;--primary: #2563eb;--primary-strong: #1d4ed8;--mint: #14b8a6;--coral: #f97316;--amber: #f59e0b;--ink: #172033;--muted: #64748b;--soft: #f4f7fb;--surface: #ffffff;--surface-strong: #eef5ff;--line: #dbe5f3;--shadow: 0 24px 70px rgba(37, 99, 235, .15)}*{box-sizing:border-box}html,body,#root{min-height:100%}body{margin:0;background:radial-gradient(circle at 10% 10%,rgba(20,184,166,.18),transparent 28%),linear-gradient(135deg,#f8fbff,#fff 46%,#eef6ff);color:var(--ink)}button,input{font:inherit}button{border:0}.app{position:relative;min-height:100vh;overflow:hidden;padding:28px 18px;display:grid;place-items:center}.campus-visual{position:absolute;inset:auto -20px 12px auto;width:min(560px,58vw);max-height:52vh;opacity:.72;pointer-events:none;-webkit-user-select:none;user-select:none}.assistant-shell{position:relative;z-index:1;width:min(100%,760px);height:min(920px,calc(100vh - 56px));min-height:640px;overflow:hidden;border:1px solid rgba(219,229,243,.9);border-radius:26px;background:#ffffffdb;box-shadow:var(--shadow);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px)}.top-bar{height:72px;padding:12px 18px;display:grid;grid-template-columns:44px 1fr 44px;align-items:center;gap:12px;color:#fff;background:linear-gradient(110deg,#2563ebfa,#14b8a6f0),var(--primary)}.brand-mark,.icon-button{width:40px;height:40px;display:inline-grid;place-items:center;border-radius:14px;color:#fff;background:#ffffff29;text-decoration:none}.icon-button{cursor:pointer;transition:transform .16s ease,background-color .16s 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