:root{--bg:#ffffff;--sidebar:#fbfbfa;--ink:#37352f;--muted:#787774;--line:#ececeb;--line2:#e6e6e4;--accent:#2563eb;--accent-soft:#eef2ff;--hover:#f1f1f0;--chip:#f4f4f3;--flag:#b45309;--flag-bg:#fef3c7;--radius:8px}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Roboto,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}
.hidden{display:none!important}
.muted{color:var(--muted)}
.err{color:#c0282d;min-height:1.2em;margin:.5em 0 0}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.gate{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:#f7f7f5;padding:20px}
.gate-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:36px 32px;width:100%;max-width:380px;box-shadow:0 12px 40px rgba(15,15,15,.08);text-align:center}
.gate-logo{width:44px;height:44px;border-radius:10px;background:var(--ink);color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;margin:0 auto 14px;letter-spacing:.5px}
.gate-card h1{margin:.1em 0 .2em;font-size:1.35rem}
.gate-card input{width:100%;padding:11px 14px;margin-top:18px;border:1px solid var(--line2);border-radius:10px;font-size:1rem;outline:none}
.gate-card input:focus{border-color:var(--accent)}
.gate-card button{width:100%;margin-top:12px;padding:11px;background:var(--ink);color:#fff;border:0;border-radius:10px;font-size:1rem;cursor:pointer}
.gate-card button:hover{opacity:.9}
.shell{display:flex;min-height:100vh}
.sidebar{width:256px;flex-shrink:0;background:var(--sidebar);border-right:1px solid var(--line);display:flex;flex-direction:column;position:sticky;top:0;height:100vh;overflow-y:auto}
.side-brand{display:flex;align-items:center;gap:10px;padding:18px 16px 12px}
.side-brand .logo{width:30px;height:30px;border-radius:8px;background:var(--ink);color:#fff;font-weight:700;font-size:.8rem;display:flex;align-items:center;justify-content:center}
.side-title{font-weight:650;font-size:.95rem}
.side-sub{font-size:.76rem}
.side-search{padding:4px 12px 10px}
.side-search input{width:100%;padding:8px 10px;border:1px solid var(--line2);border-radius:8px;font-size:.88rem;background:#fff;outline:none}
.side-search input:focus{border-color:var(--accent)}
.side-nav{padding:4px 8px;flex:1}
.nav-sec{font-size:.72rem;text-transform:uppercase;letter-spacing:.5px;color:var(--muted);padding:12px 10px 4px}
.nav-item{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:7px 10px;border-radius:6px;cursor:pointer;font-size:.9rem;color:var(--ink);margin:1px 0}
.nav-item:hover{background:var(--hover)}
.nav-item.active{background:var(--accent-soft);color:var(--accent);font-weight:600}
.nav-item .cnt{font-size:.76rem;color:var(--muted)}
.nav-item.active .cnt{color:var(--accent)}
.side-foot{padding:14px 16px;font-size:.74rem;border-top:1px solid var(--line);line-height:1.5}
.side-feedback{margin-bottom:12px}
.fb-link{background:var(--accent-soft);border:1px solid #cddcff;color:var(--accent);font-size:.82rem;font-weight:600;padding:9px 10px;border-radius:8px;cursor:pointer;width:100%;text-align:left;box-shadow:0 1px 2px rgba(37,99,235,.08)}
.fb-link:hover{background:#e2eaff;border-color:var(--accent)}
.main{flex:1;min-width:0;display:flex;flex-direction:column}
.main-head{padding:22px 32px 12px;border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(255,255,255,.9);backdrop-filter:blur(6px);z-index:2}
.main-head h2{margin:0;font-size:1.25rem}
.main-head .muted{font-size:.85rem}
.content{padding:20px 32px 60px;max-width:900px}
.doc{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;margin:0 0 12px;transition:border-color .15s,box-shadow .15s}
.doc:hover{border-color:var(--line2);box-shadow:0 2px 10px rgba(15,15,15,.04)}
.doc-meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:.78rem;color:var(--muted);margin-bottom:6px}
.chip{display:inline-block;background:var(--chip);color:#555;border-radius:5px;padding:1px 8px;font-size:.75rem}
.chip.cat{background:var(--accent-soft);color:var(--accent)}
.chip.pdf{background:#fdecec;color:#c0282d}
.doc-title{font-size:1.02rem;font-weight:600;margin:2px 0 4px}
.doc-zh{font-size:.9rem;color:var(--muted);margin:0 0 6px}
.doc-actions{display:flex;gap:16px;margin-top:10px;flex-wrap:wrap}
.act{background:none;border:0;color:var(--accent);cursor:pointer;font-size:.83rem;padding:0;font-weight:500}
.act:hover{text-decoration:underline}
.act:disabled{color:var(--muted);cursor:default}
.doc-body{margin-top:12px;border-top:1px solid var(--line);padding-top:12px}
.doc-body pre{white-space:pre-wrap;font-family:inherit;font-size:.85rem;color:#444;background:#fafafa;border:1px solid var(--line);border-radius:8px;padding:12px;max-height:340px;overflow:auto;margin:6px 0}
.trans{background:#f5f8ff;border:1px solid #dbe6ff;border-radius:8px;padding:12px;font-size:.88rem;margin:6px 0;white-space:normal}
mark{background:#fff3b0;padding:0 1px;border-radius:2px}
.doc-src{font-size:.8rem;color:var(--muted);border-top:1px dashed var(--line);padding-top:8px;margin-top:10px;word-break:break-all}
.chat-intro{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;margin-bottom:14px}
.chatlog{display:flex;flex-direction:column;gap:12px;margin-bottom:14px}
.msg{max-width:92%;padding:11px 14px;border-radius:12px;font-size:.92rem;word-break:break-word}
.msg.user{align-self:flex-end;background:var(--accent);color:#fff;border-bottom-right-radius:4px}
.msg.ai{align-self:flex-start;background:#fff;border:1px solid var(--line);width:100%;border-bottom-left-radius:4px}
.msg.ai .src{margin-top:8px;font-size:.78rem;color:var(--muted)}
.chatbar{display:flex;gap:8px;align-items:flex-end;position:sticky;bottom:0;background:var(--bg);padding:10px 0}
.chatbar textarea{flex:1;padding:10px 12px;border:1px solid var(--line2);border-radius:10px;font:inherit;resize:vertical;min-height:46px;outline:none}
.chatbar textarea:focus{border-color:var(--accent)}
.chatbar button{padding:11px 18px;background:var(--ink);color:#fff;border:0;border-radius:10px;cursor:pointer;font-size:.92rem;white-space:nowrap}
.chatbar button:disabled{opacity:.5;cursor:default}
.loading{color:var(--muted);font-size:.9rem;padding:24px 0;text-align:center}
.modal{position:fixed;inset:0;background:rgba(15,15,15,.35);display:flex;align-items:center;justify-content:center;z-index:50;padding:16px}
.modal-card{background:#fff;border-radius:14px;max-width:440px;width:100%;box-shadow:0 20px 60px rgba(0,0,0,.2);overflow:hidden}
.modal-head{display:flex;align-items:center;justify-content:space-between;padding:16px 18px;border-bottom:1px solid var(--line)}
.modal-head h3{margin:0;font-size:1.05rem}
.modal-x{background:none;border:0;font-size:1.1rem;color:var(--muted);cursor:pointer}
.modal-body{padding:14px 18px;display:flex;flex-direction:column;gap:4px}
.f-label{font-size:.78rem;color:var(--muted);margin-top:8px}
.f-input{padding:9px 10px;border:1px solid var(--line2);border-radius:8px;font:inherit;font-size:.9rem;outline:none;width:100%}
.f-input:focus{border-color:var(--accent)}
textarea.f-input{resize:vertical}
.modal-foot{display:flex;justify-content:flex-end;gap:8px;padding:12px 18px;border-top:1px solid var(--line)}
.btn-ghost{background:none;border:1px solid var(--line2);padding:8px 14px;border-radius:8px;cursor:pointer;font-size:.88rem;color:var(--ink)}
.btn-primary{background:var(--ink);color:#fff;border:0;padding:8px 16px;border-radius:8px;cursor:pointer;font-size:.88rem}
.btn-primary:disabled{opacity:.5;cursor:default}
@media(max-width:720px){.shell{flex-direction:column}.sidebar{width:100%;height:auto;position:static;border-right:0;border-bottom:1px solid var(--line)}.side-nav{display:flex;flex-wrap:wrap;gap:4px}.nav-sec{width:100%}.main-head,.content{padding-left:16px;padding-right:16px}}