:root{--night: #0b1020;--ink: #0b1020;--ink-soft: #3f4a63;--muted: #64748b;--faint: #94a3b8;--border: #e2e8f0;--border-strong: #cbd5e1;--canvas: #ffffff;--canvas-soft: #f8fafc;--surface: #f1f5f9;--cyan: #00b4ff;--cyan-soft: #e6f7ff;--mint: #00e6b8;--blue: #3b82f6;--danger: #e11d48;--ok: #059669;--radius: 12px;--font: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;--font-head: "Space Grotesk", Inter, Arial, sans-serif;--font-mono: "JetBrains Mono", Menlo, Consolas, monospace;color-scheme:light}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:var(--font);font-size:15px;color:var(--ink);background:var(--canvas-soft);-webkit-font-smoothing:antialiased;-webkit-text-size-adjust:100%}h1,h2,h3{font-family:var(--font-head);margin:0;letter-spacing:-.01em}button,input,textarea{font:inherit;color:inherit}.muted{color:var(--muted)}.small{font-size:13px}.spacer{flex:1}.pad{padding:0 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a:hover{border-color:var(--cyan)}.mail-frame{flex:1;width:100%;min-height:70vh;border:1px solid var(--border);border-radius:var(--radius);background:#fff}.empty{display:grid;place-items:center;gap:10px;text-align:center;padding:48px 24px;color:var(--ink-soft)}.empty p{margin:0;max-width:300px}.fab{position:fixed;right:20px;bottom:max(20px,env(safe-area-inset-bottom));z-index:5;display:inline-flex;align-items:center;gap:8px;height:52px;padding:0 22px;border-radius:999px;border:0;background:linear-gradient(135deg,var(--cyan),var(--mint));color:var(--night);font-weight:700;font-size:16px;box-shadow:0 10px 30px #00b4ff59;cursor:pointer}.toast{position:fixed;left:50%;bottom:90px;transform:translate(-50%);z-index:20;background:var(--night);color:#fff;padding:10px 18px;border-radius:999px;font-size:14px;box-shadow:0 10px 30px #00000040}.overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:10;background:#0b10208c;display:grid;place-items:center;padding:24px}.composer,.sheet{width:100%;max-width:1200px;height:100%;max-height:860px;background:var(--canvas);border-radius:16px;display:flex;flex-direction:column;overflow:hidden;box-shadow:0 30px 80px #00000059}.sheet{max-width:900px;height:auto;max-height:100%;overflow-y:auto}.composer-head{display:flex;align-items:center;gap:8px;padding:12px 16px;border-bottom:1px solid var(--border)}.composer-head h2{font-size:18px}.fields{border-bottom:1px solid var(--border)}.row{display:flex;align-items:center;gap:10px;padding:0 16px;border-bottom:1px solid var(--border)}.row:last-child{border-bottom:0}.row>span{width:56px;flex:none;font-size:13px;color:var(--muted)}.row input{flex:1;min-width:0;border:0;outline:none;height:42px;font-size:15px;background:transparent}.editor-bar{display:flex;align-items:center;gap:10px;padding:8px 16px;border-bottom:1px solid var(--border);flex-wrap:wrap}.seg{display:inline-flex;background:var(--surface);border-radius:999px;padding:3px}.seg button{border:0;background:transparent;border-radius:999px;padding:5px 12px;font-size:13px;font-weight:600;color:var(--muted);cursor:pointer}.seg button.on{background:var(--canvas);color:var(--ink);box-shadow:0 1px 3px #0000001f}.tools{display:flex;gap:2px}.tool{min-width:34px;height:32px;border:0;border-radius:8px;background:transparent;cursor:pointer;font-weight:700;color:var(--ink-soft)}.tool:hover:not(:disabled){background:var(--surface)}.tool:disabled{opacity:.35}.mobile-only{display:none}.editor{flex:1;min-height:0;display:grid;grid-template-columns:1fr 1fr}.source{width:100%;height:100%;resize:none;border:0;outline:none;padding:16px;font-family:var(--font-mono);font-size:14px;line-height:1.6;border-right:1px solid var(--border)}.preview{min-height:0;background:var(--canvas-soft)}.preview iframe{width:100%;height:100%;border:0;display:block}.sig-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:20px;padding:16px}.sig-form{display:grid;gap:12px;align-content:start}.row-actions{display:flex;gap:8px;flex-wrap:wrap}.sig-preview{display:grid;gap:6px;align-content:start}.sig-preview iframe{width:100%;height:240px;border:1px solid var(--border);border-radius:var(--radius);background:#fff}@media (max-width: 760px){.topbar{flex-wrap:wrap;gap:8px;padding:8px 12px;padding-top:max(8px,env(safe-area-inset-top))}.folders{order:3;flex-basis:100%}.top-actions{margin-left:auto}.panes{grid-template-columns:1fr}.list-pane{border-right:0}.reader-pane,.app.reading .list-pane{display:none}.app.reading .reader-pane{display:block}.app.reading .fab{display:none}.reader{padding:12px 12px 32px}.reader-actions .back{display:inline-flex;margin-left:-8px}.reader-subject{font-size:20px}.mail-frame{min-height:65vh}.fab 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