:root{--bg:#f4f6f9;--panel:#fff;--ink:#172033;--muted:#697386;--line:#e5e9f0;--accent:#1f5eff;--accent-soft:#eef3ff;--shadow:0 12px 35px rgba(30,42,70,.08)}*{box-sizing:border-box}html,body{height:100%;margin:0}body{font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--ink)}button,input{font:inherit}.app-shell{height:100vh;display:flex;flex-direction:column}.topbar{height:68px;flex:0 0 68px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 24px}.brand{display:flex;align-items:center;gap:11px}.brand-mark,.login-logo{display:grid;place-items:center;background:linear-gradient(145deg,#245fff,#173fc2);color:#fff;font-weight:800;border-radius:11px;box-shadow:0 6px 16px rgba(31,94,255,.24)}.brand-mark{width:38px;height:38px}.brand div{display:flex;flex-direction:column;line-height:1.15}.brand strong{font-size:15px}.brand span{font-size:12px;color:var(--muted);margin-top:3px}.top-actions{display:flex;align-items:center;gap:18px}.count{font-size:13px;color:var(--muted)}.logout{color:var(--ink);text-decoration:none;font-size:13px;font-weight:600}.workspace{min-height:0;flex:1;display:grid;grid-template-columns:390px minmax(0,1fr);gap:0}.sidebar{background:#fff;border-right:1px solid var(--line);min-height:0;display:flex;flex-direction:column}.search{margin:16px;position:relative;display:flex;gap:8px}.search svg{position:absolute;left:13px;top:12px;width:18px;height:18px;fill:none;stroke:#8a94a6;stroke-width:2}.search input{width:100%;height:42px;border:1px solid var(--line);background:#f8f9fb;border-radius:10px;padding:0 12px 0 40px;outline:none}.search input:focus{border-color:#9bb5ff;box-shadow:0 0 0 3px var(--accent-soft);background:#fff}.search button{position:absolute;right:4px;top:4px;height:34px;border:0;border-radius:8px;background:var(--ink);color:#fff;padding:0 12px;cursor:pointer;opacity:0}.search:focus-within button{opacity:1}.list-head{display:flex;justify-content:space-between;align-items:center;padding:2px 18px 11px;font-size:12px;font-weight:700;color:#7b8494;text-transform:uppercase;letter-spacing:.06em}.list-head a{font-weight:600;text-transform:none;letter-spacing:0;color:var(--accent);text-decoration:none}.mail-list{overflow:auto;min-height:0;border-top:1px solid var(--line)}.mail-item{width:100%;text-align:left;border:0;border-bottom:1px solid #edf0f4;background:#fff;padding:15px 18px;cursor:pointer;transition:.15s}.mail-item:hover{background:#f8faff}.mail-item.active{background:var(--accent-soft);box-shadow:inset 3px 0 0 var(--accent)}.item-top{display:flex;justify-content:space-between;align-items:center}.item-top time{font-size:11px;color:#8a94a6;font-weight:600}.chevron{font-size:20px;color:#b4bbc7}.address{font-size:13px;font-weight:700;margin-top:5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.subject{font-size:13px;color:var(--muted);margin-top:5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.empty-list{padding:30px 18px;color:var(--muted);font-size:14px}.detail{min-width:0;overflow:auto;padding:28px 34px 50px}.welcome{height:100%;min-height:400px;display:grid;place-content:center;text-align:center;color:var(--muted)}.welcome-icon{margin:auto;width:58px;height:58px;border-radius:18px;background:#fff;box-shadow:var(--shadow);display:grid;place-items:center;font-size:25px}.welcome h1{font-size:20px;color:var(--ink);margin:18px 0 7px}.welcome p{margin:0;font-size:14px}.mail-card{max-width:1050px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);overflow:hidden}.mail-header{padding:26px 30px 22px;border-bottom:1px solid var(--line)}.mail-title-row{display:flex;justify-content:space-between;gap:20px;align-items:flex-start}.mail-title{font-size:23px;line-height:1.3;margin:0;font-weight:750}.eml{flex:none;text-decoration:none;color:var(--accent);background:var(--accent-soft);padding:9px 12px;border-radius:9px;font-size:12px;font-weight:700}.meta{margin-top:19px;display:grid;grid-template-columns:52px 1fr;gap:7px 12px;font-size:13px}.meta dt{color:#8a94a6}.meta dd{margin:0;overflow-wrap:anywhere}.mail-body{padding:30px;white-space:pre-wrap;overflow-wrap:anywhere;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;line-height:1.65;color:#283246}.attachments{padding:18px 30px;border-bottom:1px solid var(--line);display:flex;flex-wrap:wrap;gap:8px}.attachment{display:inline-flex;align-items:center;gap:7px;border:1px solid var(--line);background:#fafbfc;border-radius:9px;padding:8px 10px;text-decoration:none;color:var(--ink);font-size:12px}.attachment small{color:var(--muted)}.loading{height:100%;display:grid;place-content:center;color:var(--muted)}.spinner{width:28px;height:28px;margin:auto;border:3px solid #e5e9f0;border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.login-page{min-height:100vh;display:grid;place-items:center;padding:20px;background:radial-gradient(circle at 50% 0,#edf2ff 0,transparent 40%),var(--bg)}.login-card{width:min(390px,100%);background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:34px}.login-logo{width:48px;height:48px;margin-bottom:22px}.login-card h1{margin:0;font-size:24px}.login-card>p{margin:7px 0 25px;color:var(--muted);font-size:14px}.login-card label{display:block;font-size:12px;font-weight:700;margin:14px 0;color:#4b5567}.login-card input{display:block;width:100%;margin-top:7px;height:44px;border:1px solid var(--line);border-radius:9px;padding:0 12px;outline:none}.login-card input:focus{border-color:#9bb5ff;box-shadow:0 0 0 3px var(--accent-soft)}.login-card button{width:100%;height:44px;margin-top:10px;border:0;border-radius:9px;background:var(--accent);color:#fff;font-weight:700;cursor:pointer}.error{background:#fff1f1;color:#b42318;padding:10px 12px;border-radius:8px;font-size:13px;margin-bottom:12px}@media(max-width:800px){.workspace{grid-template-columns:1fr}.sidebar{border-right:0}.detail{display:none}.workspace.show-detail .sidebar{display:none}.workspace.show-detail .detail{display:block;padding:16px}.topbar{padding:0 16px}.count{display:none}.mail-header,.mail-body{padding-left:20px;padding-right:20px}}