:root{--bg:#f6f4ef;--bg-deep:#eceff3;--surface:#fff;--surface-soft:#f7f8fa;--surface-warm:#fbfaf7;--card:#ffffffe6;--card-strong:#fffffffa;--text:#1e2430;--muted:#687286;--line:#242b381f;--line-strong:#242b3833;--accent:#2563eb;--accent-strong:#1d4ed8;--accent-soft:#2563eb1a;--sidebar:#fff;--danger:#d63545;--shadow:0 18px 45px #242b3814;--shadow-soft:0 8px 22px #242b380f;--radius-lg:22px;--radius-md:16px;--radius-sm:11px}*{box-sizing:border-box}html,body{min-height:100%;margin:0}body{color:var(--text);background:radial-gradient(circle at 15% -8%, #2563eb1f, transparent 30rem), radial-gradient(circle at 92% 4%, #d977061a, transparent 25rem), linear-gradient(135deg, var(--bg), var(--bg-deep));font-family:ui-rounded,SF Pro Rounded,Avenir Next,Nunito Sans,sans-serif}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit}.app-shell{grid-template-columns:236px minmax(0,1fr);gap:12px;min-height:100vh;padding:10px;display:grid}.language-switcher{border:1px solid var(--line);background:var(--surface-soft);border-radius:999px;gap:3px;padding:4px;display:inline-flex}.language-switcher a{color:var(--muted);border-radius:999px;padding:7px 11px;font-size:.82rem;font-weight:700;transition:background .16s,color .16s}.language-switcher a.active{background:var(--accent);color:#fff}.sidebar,.panel,.card{border:1px solid var(--line);background:var(--card);box-shadow:var(--shadow-soft)}.sidebar{background:var(--sidebar);border-radius:18px;grid-template-rows:auto 1fr auto;height:calc(100vh - 20px);padding:12px;display:grid;position:sticky;top:10px}.brand{border-bottom:1px solid var(--line);grid-template-columns:40px minmax(0,1fr);align-items:center;gap:10px;margin-bottom:14px;padding:8px 8px 16px;display:grid}.auth-card .brand{grid-template-columns:72px minmax(0,1fr);align-items:center;gap:18px;padding:0 0 20px}.auth-brand-copy{gap:8px;display:grid}.auth-card .brand-mark{border-radius:20px;width:64px;height:64px;font-size:1.2rem}.auth-card .brand h1{font-size:1.45rem}.auth-card .brand p{max-width:360px;font-size:.95rem;line-height:1.35}.brand-mark{color:#fff;background:linear-gradient(145deg,#2563eb,#14b8a6);border-radius:12px;place-items:center;width:40px;height:40px;font-size:.95rem;font-weight:800;display:grid;box-shadow:0 9px 18px #2563eb2e}.brand h1,.hero h1{letter-spacing:-.035em;margin:0}.brand h1{font-size:1.02rem;line-height:1.1}.brand p{font-size:.78rem;line-height:1.35}.brand p,.muted{color:var(--muted);margin:0}.nav{align-content:start;gap:5px;display:grid}.nav a{color:var(--muted);border-radius:12px;padding:10px 11px;font-size:.9rem;font-weight:700;transition:background .16s,color .16s}.nav a:hover,.nav a.active{color:var(--accent-strong);background:var(--accent-soft)}.sidebar-footer{border:1px solid var(--line);background:var(--surface-soft);border-radius:16px;grid-template-columns:36px minmax(0,1fr);align-items:center;gap:10px;margin-top:16px;padding:12px;display:grid}.logout-button{border:1px solid var(--line);width:100%;color:var(--muted);cursor:pointer;background:#fff;border-radius:12px;grid-column:1/-1;padding:8px 10px;font-size:.82rem;font-weight:800}.logout-button:hover{color:var(--danger);background:#fff7f7}.sidebar-footer p{color:var(--muted);margin:0 0 2px;font-size:.74rem;font-weight:700}.sidebar-footer strong{color:var(--text);text-overflow:ellipsis;white-space:nowrap;font-size:.86rem;display:block;overflow:hidden}.user-avatar{width:36px;height:36px;color:var(--accent-strong);background:#edf3ff;border-radius:999px;place-items:center;font-size:.78rem;font-weight:800;display:grid}.main-frame{grid-template-rows:auto minmax(0,1fr);gap:10px;min-width:0;display:grid}.topbar{border:1px solid var(--line);min-height:50px;box-shadow:var(--shadow-soft);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#ffffffd1;border-radius:20px;justify-content:space-between;align-items:center;padding:8px 10px 8px 16px;display:flex}.topbar p,.topbar h2{margin:0}.topbar p{color:var(--muted);letter-spacing:.08em;text-transform:uppercase;font-size:.76rem;font-weight:800}.topbar h2{letter-spacing:-.02em;margin-top:2px;font-size:1rem}.main{align-content:start;gap:10px;min-width:0;max-width:1680px;display:grid}.hero,.panel,.card{border-radius:var(--radius-lg)}.hero{background:linear-gradient(135deg, #fffffffa, #fbfaf7eb), var(--surface);border:1px solid var(--line);box-shadow:var(--shadow-soft);gap:10px;padding:26px 30px;display:grid}.hero h1{max-width:980px;font-size:clamp(1.7rem,2.7vw,2.55rem);line-height:1.06}.hero .muted{max-width:760px;line-height:1.6}.panel{background:var(--card-strong);box-shadow:var(--shadow-soft);padding:20px}.grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;display:grid}.card{background:var(--card-strong);box-shadow:var(--shadow-soft);padding:18px}.card h3{margin:0 0 8px;font-size:1rem}.form{gap:14px;display:grid}.field{gap:7px;display:grid}.field span{color:var(--muted);font-size:.86rem;font-weight:700}.input,.textarea,.select{border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface-soft);width:100%;color:var(--text);outline:none;padding:11px 12px}.input:focus,.textarea:focus,.select:focus{background:#fff;border-color:#0a66d875;box-shadow:0 0 0 4px #0a66d81a}.textarea{resize:vertical;min-height:120px}.button{background:var(--accent);color:#fff;cursor:pointer;border:0;border-radius:999px;justify-content:center;align-items:center;padding:11px 17px;font-weight:700;display:inline-flex;box-shadow:0 10px 20px #0a66d82e}.button:hover{background:var(--accent-strong)}.button.secondary{border:1px solid var(--line);color:var(--text);box-shadow:none;background:#fff}.wechat-login-button{background:#19a45b;width:100%;box-shadow:0 10px 20px #19a45b2e}.wechat-login-button:disabled{cursor:not-allowed;opacity:.5}.wechat-login-button:hover{background:#14884b}.wechat-login-button:disabled:hover{background:#19a45b}.auth-hint{font-size:.84rem;line-height:1.45}.auth-divider{color:var(--muted);align-items:center;gap:12px;font-size:.82rem;font-weight:800;display:flex}.auth-divider:before,.auth-divider:after{content:"";background:var(--line);flex:1;height:1px}.create-user-form{grid-template-columns:repeat(4,minmax(0,1fr)) auto;align-items:end;gap:12px;margin-top:16px;display:grid}.success-text{color:#14884b;font-weight:800}.error-text{color:var(--danger);font-weight:800}.chat-layout{min-height:calc(100vh - 82px)}.chat-panel{min-height:calc(100vh - 82px);box-shadow:none;background:0 0;border:0;grid-template-rows:minmax(0,1fr) auto auto;padding:0;display:grid}.messages{align-content:end;gap:12px;padding:18px max(18px,50% - 460px);display:grid;overflow:auto}.message{white-space:pre-wrap;max-width:min(720px,78%);box-shadow:none;border-radius:17px;padding:13px 15px;line-height:1.55}.message.user{background:var(--accent);color:#fff;border-bottom-right-radius:8px;justify-self:end}.message.assistant{border:1px solid var(--line);background:#fff;border-bottom-left-radius:8px;justify-self:start}.message-attachments{flex-wrap:wrap;gap:8px;margin-top:10px;display:flex}.message-attachments .attachment-image{background-position:50%;background-size:cover;border:1px solid #ffffff61;border-radius:12px;width:112px;height:84px}.message-downloads{gap:8px;margin-top:10px;display:grid}.message-downloads a{width:fit-content;color:var(--accent);background:#2b65e814;border:1px solid #2b65e83d;border-radius:999px;padding:7px 10px;font-size:.88rem;font-weight:800;text-decoration:none}.attachment-strip{flex-wrap:wrap;gap:10px;width:min(100%,860px);margin:8px auto 0;padding-inline:8px;display:flex}.attachment-preview{border:1px solid var(--line);background:var(--surface-soft);border-radius:14px;width:112px;height:86px;position:relative;overflow:hidden}.attachment-preview .attachment-image{background-position:50%;background-size:cover;width:100%;height:100%}.attachment-preview button{color:#fff;cursor:pointer;background:#1e2430b8;border:0;border-radius:999px;padding:4px 8px;font-size:.72rem;font-weight:800;position:absolute;bottom:6px;right:6px}.drop-hint{color:var(--muted);text-align:center;margin:8px 0 0;font-size:.78rem}.chat-composer{gap:8px;width:min(100%,860px);margin:0 auto;padding:0 8px 12px;display:grid}.composer-main{border:1px solid var(--line);background:#ffffffeb;border-radius:18px;grid-template-rows:minmax(58px,auto) auto;gap:10px;padding:14px;display:grid;box-shadow:0 14px 34px #242b3814}.composer-input{width:100%;color:var(--text);background:0 0;border:0;outline:none;font-size:1.02rem}.composer-input::placeholder{color:#858b96}.composer-actions{justify-content:space-between;align-items:center;gap:10px;display:flex}.composer-icon-button{color:var(--muted);cursor:pointer;background:0 0;border:0;border-radius:999px;align-items:center;gap:8px;padding:7px 9px;font-weight:800;display:inline-flex}.composer-icon-button:hover{background:var(--surface-soft);color:var(--text)}.composer-icon-button span{font-size:.84rem}.composer-send{min-width:92px;padding:9px 15px}.case-context-compact{border:1px solid var(--line);background:#ffffffd1;border-radius:16px;overflow:hidden}.case-context-compact summary{color:var(--text);cursor:pointer;grid-template-columns:minmax(0,1fr);gap:2px;padding:11px 13px;list-style:none;display:grid}.case-context-compact summary::-webkit-details-marker{display:none}.case-context-compact summary span{font-size:.88rem;font-weight:800}.case-context-compact summary small{color:var(--muted);font-size:.76rem}.case-context-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;padding:0 13px 13px;display:grid}.field.wide{grid-column:span 2}.textarea.compact{min-height:76px}.table{border-collapse:collapse;border-radius:var(--radius-md);width:100%;overflow:hidden}.table th,.table td{border-bottom:1px solid var(--line);text-align:left;padding:12px 14px}.table th{background:var(--surface-soft);color:var(--muted);letter-spacing:.02em;text-transform:uppercase;font-size:.82rem}.table td{background:#fff}.status-pill{background:var(--accent-soft);color:#1d4ed8;letter-spacing:.02em;text-transform:uppercase;border-radius:999px;padding:6px 11px;font-size:.78rem;font-weight:700;display:inline-flex}.center-page{place-items:center;min-height:100vh;padding:24px;display:grid}.auth-card{border-radius:var(--radius-lg);border:1px solid var(--line);background:var(--card-strong);width:min(100%,520px);box-shadow:var(--shadow);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);padding:30px}@media (max-width:920px){.app-shell{grid-template-columns:1fr;padding:10px}.sidebar{height:auto;position:static}.main-frame{gap:10px}.nav{grid-template-columns:repeat(4,minmax(0,1fr))}.grid{grid-template-columns:1fr}.create-user-form,.case-context-grid{grid-template-columns:1fr 1fr}}@media (max-width:560px){.app-shell{padding:12px}.sidebar,.hero,.panel,.card,.auth-card{border-radius:24px}.nav{grid-template-columns:1fr 1fr}.topbar{flex-direction:column;align-items:stretch;gap:10px}.language-switcher{justify-content:stretch;width:100%}.language-switcher a{text-align:center;flex:1}.chat-composer{grid-template-columns:1fr}.message{max-width:94%}.chat-panel{min-height:auto}.case-context-grid,.field.wide{grid-column:auto;grid-template-columns:1fr}.create-user-form{grid-template-columns:1fr}}