:root{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;--bg-primary: #0d0d0d;--bg-secondary: #171717;--bg-tertiary: #1f1f1f;--bg-elevated: #232323;--border-subtle: #2a2a2a;--border-medium: #3a3a3a;--text-primary: #ececf1;--text-secondary: #b0b0b0;--text-tertiary: #707070;--accent: #10a37f;--accent-hover: #0d8c6f;--accent-subtle: #0d523f;--user-bg: #2d2d2d;--assistant-bg: #1a1a1a;--error: #ef4444;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .4), 0 2px 4px -2px rgba(0, 0, 0, .3);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .5), 0 4px 6px -4px rgba(0, 0, 0, .4)}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;background:var(--bg-primary);color:var(--text-primary)}body{overflow:hidden;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}input,select,button,textarea{font:inherit;outline:none}button{cursor:pointer;transition:all .2s 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p{color:var(--text-tertiary);font-size:12px;margin-top:6px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.new-chat{margin:16px;background:linear-gradient(135deg,var(--accent) 0%,var(--accent-hover) 100%);border:none;border-radius:12px;padding:12px 16px;color:#fff;font-weight:600;font-size:14px;box-shadow:var(--shadow-sm)}.new-chat:hover{transform:translateY(-1px);box-shadow:var(--shadow-md)}.new-chat:active{transform:translateY(0)}.chat-list{flex:1;overflow-y:auto;padding:0 12px 12px}.chat-item{background:transparent;border:none;border-radius:10px;padding:12px 14px;margin-bottom:4px;text-align:left;width:100%;color:var(--text-secondary);font-size:14px;transition:all .15s ease}.chat-item:hover{background:var(--bg-tertiary);color:var(--text-primary)}.chat-item.active{background:var(--bg-tertiary);color:var(--text-primary);box-shadow:inset 2px 0 0 var(--accent)}.chat-item span{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:500}.chat-item 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12px;font-size:13px}.sidebar-overlay{display:none}.chat-list::-webkit-scrollbar,.messages::-webkit-scrollbar,.attachment-strip::-webkit-scrollbar{width:8px;height:8px}.chat-list::-webkit-scrollbar-track,.messages::-webkit-scrollbar-track,.attachment-strip::-webkit-scrollbar-track{background:transparent}.chat-list::-webkit-scrollbar-thumb,.messages::-webkit-scrollbar-thumb,.attachment-strip::-webkit-scrollbar-thumb{background:var(--border-medium);border-radius:4px}.chat-list::-webkit-scrollbar-thumb:hover,.messages::-webkit-scrollbar-thumb:hover,.attachment-strip::-webkit-scrollbar-thumb:hover{background:#505050}@media (max-width: 768px){.app-shell{grid-template-columns:1fr}.sidebar{position:fixed;top:0;left:0;bottom:0;width:280px;z-index:100;transform:translate(-100%);box-shadow:var(--shadow-lg)}.sidebar.sidebar-open{transform:translate(0)}.sidebar-overlay{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;z-index:99;animation:fadeIn .2s ease;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.menu-toggle{display:flex;align-items:center;justify-content:center}.topbar{padding:16px 20px;min-height:64px}.topbar h1{font-size:16px}.topbar p{font-size:11px}.model-select{display:none}.messages,.attachment-strip,.composer{padding-left:20px;padding-right:20px}.messages{padding-top:24px;padding-bottom:24px;gap:16px}.bubble{max-width:100%;padding:12px 16px;font-size:14px}.bubble p{font-size:14px}.composer{padding-top:16px;padding-bottom:20px}.composer-tools{flex-wrap:wrap;gap:8px}.ghost-btn{flex:1;min-width:calc(50% - 4px)}.composer form{grid-template-columns:1fr;gap:10px}.composer button[type=submit]{width:100%}.auth-card{padding:32px 24px}.auth-card h1{font-size:28px}}@media (max-width: 480px){.topbar h1{font-size:15px}.attachment-chip{min-width:200px}.composer input,.composer button[type=submit],.ghost-btn{font-size:14px}}