:root{--bg:#0f1117;--surface:#1a1d27;--surface-hover:#222633;--border:#2d3344;--text:#e8eaef;--text-muted:#8b93a7;--accent:#5b8def;--accent-hover:#4a7de0;--success:#3dd68c;--danger:#f07178;--radius:12px;--shadow:0 8px 32px rgba(0,0,0,.35)}*{box-sizing:border-box;margin:0;padding:0}body,html{min-height:100%;font-family:Segoe UI,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);line-height:1.5}a{color:inherit;text-decoration:none}button{cursor:pointer;border:none;background:none}button,input{font:inherit}.container{max-width:960px;margin:0 auto;padding:0 20px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border-radius:var(--radius);font-weight:600;transition:background .15s,transform .1s}.btn:active{transform:scale(.98)}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-ghost{background:var(--surface);color:var(--text);border:1px solid var(--border)}.btn-ghost:hover{background:var(--surface-hover)}.input-group{display:flex;align-items:stretch;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}.input-group input{flex:1 1;min-width:0;padding:14px 16px;background:transparent;border:none;color:var(--text);outline:none}.input-group input::placeholder{color:var(--text-muted)}.input-suffix{display:flex;align-items:center;padding:0 16px;color:var(--text-muted);background:hsla(0,0%,100%,.03);border-left:1px solid var(--border);white-space:nowrap}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}.error-text{color:var(--danger);font-size:14px;margin-top:8px}.badge{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;font-size:12px;background:rgba(61,214,140,.12);color:var(--success)}.badge-dot{width:6px;height:6px;border-radius:50%;background:currentColor;animation:pulse 2s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.4}}.message-list{list-style:none}.message-item{display:block;width:100%;text-align:left;padding:16px 20px;border-bottom:1px solid var(--border);transition:background .15s;cursor:pointer}.message-item:last-child{border-bottom:none}.message-item.active,.message-item:hover{background:var(--surface-hover)}.message-item.unread .message-subject{font-weight:700}.message-subject{font-size:15px;margin-bottom:4px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.message-meta{display:flex;gap:12px;font-size:13px;color:var(--text-muted)}.message-from{flex:1 1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.empty-state{padding:48px 20px;text-align:center;color:var(--text-muted)}.empty-state-icon{font-size:48px;margin-bottom:12px;opacity:.5}.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;padding:20px;z-index:100;animation:fadeIn .15s ease}.modal{width:100%;max-width:720px;max-height:85vh;overflow:hidden;display:flex;flex-direction:column;animation:slideUp .2s ease}.modal-header{padding:20px 24px;border-bottom:1px solid var(--border)}.modal-subject{font-size:18px;font-weight:600;margin-bottom:8px}.modal-meta{font-size:13px;color:var(--text-muted);display:flex;flex-direction:column;gap:2px}.modal-body{padding:24px;overflow-y:auto;flex:1 1}.modal-body iframe{width:100%;min-height:300px;border:none;background:#fff;border-radius:8px}.modal-body pre{white-space:pre-wrap;word-break:break-word;font-family:inherit;font-size:14px;line-height:1.6}.modal-footer{padding:16px 24px;border-top:1px solid var(--border);display:flex;justify-content:flex-end}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.copy-toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--surface);border:1px solid var(--border);padding:10px 20px;border-radius:999px;font-size:14px;box-shadow:var(--shadow);z-index:200;animation:fadeIn .15s ease}