:root{--bg:#f6f8fc;--sidebar:#fff;--surface:#fff;--surface-2:#f8fbff;--surface-3:#eef4ff;--text:#0f172a;--muted:#64748b;--line:#dbe5f4;--line-soft:#e8eef8;--accent:#2563eb;--accent-soft:#eaf1ff;--success:#16a34a;--warn:#d97706;--danger:#dc2626}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,sans-serif}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button{border:0}svg{display:block}.app-shell{display:grid;grid-template-columns:264px 1fr;min-height:100vh;position:relative}.sidebar-backdrop{display:none}.sidebar{border-right:1px solid var(--line-soft);background:var(--sidebar);padding:18px 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(max-width:980px){.app-shell{grid-template-columns:1fr}.sidebar-backdrop.visible{display:block;position:fixed;inset:0;background:rgba(15,23,42,.42);z-index:15}.sidebar{position:fixed;left:0;top:0;bottom:0;width:min(82vw,320px);height:100vh;border-right:1px solid var(--line);border-bottom:0;transform:translateX(-100%);transition:transform .2s ease;box-shadow:0 16px 40px rgba(15,23,42,.18)}.app-shell.sidebar-open .sidebar{transform:translateX(0)}.chat-layout,.grid-2,.login-notice-grid,.session-detail-grid-2{grid-template-columns:1fr}.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}.main{padding:18px}.secondary-btn.mobile-nav-toggle{display:inline-flex}.page-title{font-size:24px}.login-card{padding:24px 20px}.login-title{font-size:28px}.chat-layout{height:auto}.chat-panel-top{flex-wrap:wrap;gap:10px}.chat-panel-top-side{white-space:normal;padding-top:0}.session-card-header{grid-template-columns:1fr}.session-meta-wrap{justify-content:space-between;align-items:flex-start}.session-meta-compact{justify-content:start;text-align:left}.session-meta-line-full{justify-content:flex-start}.sticky-chat-top{top:64px}.inline-notification{left:18px;right:18px;bottom:18px}.viewer-page{padding:16px}.viewer-topbar{flex-direction:column}}