:root{--bg: #0f1419;--panel: #1a222c;--text: #e7ecf1;--muted: #8b9aab;--accent: #3d8bfd;--border: #2a3542;--danger: #e35d6a;font-family:IBM Plex Sans,Segoe UI,sans-serif;color:var(--text);background:radial-gradient(1200px 600px at 10% -10%,#1b2a3d,var(--bg))}*{box-sizing:border-box}html,body,#root{min-height:100%;margin:0}body{min-height:100vh}button,input,select{font:inherit}.shell{max-width:1100px;margin:0 auto;padding:2rem 1.25rem 3rem}.brand{font-family:"IBM Plex Serif",Georgia,serif;font-size:clamp(1.8rem,4vw,2.6rem);letter-spacing:-.02em;margin:0 0 .35rem}.sub{color:var(--muted);margin:0 0 1.5rem}.panel{background:color-mix(in srgb,var(--panel) 92%,transparent);border:1px solid var(--border);border-radius:12px;padding:1.25rem}.login{max-width:420px;display:grid;gap:.85rem}label{display:grid;gap:.35rem;font-size:.9rem;color:var(--muted)}input,select{background:#0c1117;border:1px solid var(--border);border-radius:8px;color:var(--text);padding:.7rem .8rem}button{background:var(--accent);color:#fff;border:0;border-radius:8px;padding:.7rem 1rem;cursor:pointer}button.ghost{background:transparent;border:1px solid var(--border);color:var(--text)}button:disabled{opacity:.55;cursor:not-allowed}.error{color:var(--danger);font-size:.9rem}.layout{display:grid;grid-template-columns:320px 1fr;gap:1rem}@media(max-width:860px){.layout{grid-template-columns:1fr}}.list{display:grid;gap:.35rem;max-height:70vh;overflow:auto}.msg{text-align:left;background:#121820;border:1px solid var(--border);border-radius:8px;padding:.75rem;color:var(--text)}.msg.active{border-color:var(--accent)}.msg.unread .subject{font-weight:700}.subject{margin:0 0 .25rem}.meta{color:var(--muted);font-size:.8rem}.detail h2{margin-top:0;font-size:1.2rem}.iframe-wrap{margin-top:1rem;border:1px solid var(--border);border-radius:8px;overflow:hidden;background:#fff;min-height:280px}.iframe-wrap iframe{width:100%;min-height:280px;border:0;background:#fff}.toolbar{display:flex;justify-content:space-between;align-items:center;gap:1rem;margin-bottom:1rem}.pre{white-space:pre-wrap;font-family:IBM Plex Mono,ui-monospace,monospace;font-size:.9rem;color:var(--text)}