:root,[data-theme=dark]{--bg: #0c0c0f;--surface: #141419;--surface-hover: #1a1a21;--border: #2a2a33;--text: #e8e8ed;--text-muted: #8888a0;--accent: #6366f1;--accent-hover: #818cf8;--success: #22c55e;--radius: 12px;--radius-sm: 8px;--font: "DM Sans", system-ui, sans-serif;--font-mono: "JetBrains Mono", monospace}[data-theme=light]{--bg: #f4f4f8;--surface: #ffffff;--surface-hover: #e8e8f0;--border: #e0e0e8;--text: #1a1a24;--text-muted: #6b6b80;--accent: #4f46e5;--accent-hover: #6366f1;--success: #16a34a}*{box-sizing:border-box}html{text-size-adjust:100%;-webkit-text-size-adjust:100%}body{margin:0;min-height:100vh;background:var(--bg);color:var(--text);font-family:var(--font);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased}#root{min-height:100vh}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-hover)}button{font-family:inherit;cursor:pointer}input,textarea{font-family:inherit}.app-layout{display:flex;min-height:100vh}.app-main{flex:1;min-width:0;display:flex;flex-direction:column;margin-left:260px;padding:1.5rem;transition:margin-left .2s}@media (max-width: 899px){.app-main{margin-left:0;padding-top:3.5rem}}@media (max-width: 600px){body{font-size:14px}.app-main{padding:1rem}}@media (min-width: 900px){.app-layout .sidebar.collapsed~.app-main{margin-left:56px}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.6rem 1.2rem;border:none;border-radius:var(--radius-sm);font-weight:600;font-size:.9rem;transition:background .15s,color .15s,transform .1s}.btn:active{transform:scale(.98)}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-ghost{background:transparent;color:var(--text-muted)}.btn-ghost:hover{background:var(--surface-hover);color:var(--text)}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}.input-group{display:flex;flex-direction:column;gap:.35rem}.input-group label{font-size:.85rem;font-weight:500;color:var(--text-muted)}.input-group input,.input-group textarea{padding:.65rem .9rem;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-size:.95rem}.input-group input:focus,.input-group textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 2px #6366f133}.input-group textarea{min-height:100px;resize:vertical}.form-error,.page-error,.message-soft{padding:.75rem 1rem;font-size:.9rem;color:var(--text-muted);background:var(--surface-hover);border-radius:var(--radius-sm);border:1px solid var(--border)}