:root{--color-accent: #007AFF;--color-accent-hover: #0062CC;--color-accent-light: #E5F1FF;--color-accent-text: #FFFFFF;--color-white: #FFFFFF;--color-gray-50: #F9F9F9;--color-gray-100: #F4F4F4;--color-gray-200: #E8E8E8;--color-gray-300: #D9D9D9;--color-gray-400: #B4B4B4;--color-gray-500: #8E8E8E;--color-gray-600: #6E6E6E;--color-gray-700: #4A4A4A;--color-gray-800: #2D2D2D;--color-gray-900: #333333;--color-text-muted: #767676;--color-avatar-bg: #E8D5C4;--color-avatar-text: #6B4C35;--color-purple: #7048E8;--color-danger: #D63333;--color-danger-hover: #C02828;--color-danger-light: #FFF5F5;--color-success: #2F9E44;--color-success-hover: #2B8A3E;--color-success-light: #EBFBEE;--color-warning: #E67700;--color-warning-hover: #D46B00;--color-warning-light: #FFF9DB;--color-red-50: #FEF2F2;--color-red-100: #FEE2E2;--color-red-200: #FECACA;--color-red-700: #B91C1C;--font-family: "Google Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-family-mono: "SF Mono", "Fira Code", "Fira Mono", Menlo, Consolas, monospace;--font-size-2xs: 10px;--font-size-xs: 12px;--font-size-sm: 13px;--font-size-base: 14px;--font-size-md: 16px;--font-size-lg: 18px;--font-size-xl: 20px;--font-size-2xl: 24px;--font-size-3xl: 30px;--font-weight-regular: 400;--font-weight-medium: 500;--font-weight-semibold: 600;--font-weight-bold: 700;--line-height-tight: 1.25;--line-height-base: 1.5;--line-height-relaxed: 1.625;--letter-spacing-tight: .03em;--letter-spacing-wide: .05em;--space-0: 2px;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--space-8: 32px;--space-10: 40px;--space-12: 48px;--space-16: 64px;--sidebar-width: 260px;--topbar-height: 52px;--message-max-width: 800px;--input-max-width: 840px;--sidebar-bg: var(--color-gray-50);--sidebar-hover: #ECECEC;--sidebar-active: var(--color-gray-200);--bubble-radius: 20px;--card-bg: rgba(255, 255, 255, .45);--card-blur: 16px;--card-radius: 14px;--card-shadow: 0 4px 20px rgba(0, 0, 0, .06), inset 0 2px 3px rgba(255, 255, 255, 1), inset 0 0 0 1.5px rgba(255, 255, 255, .8);--card-border: 1px solid rgba(0, 0, 0, .06);--card-border-color-hover: rgba(0, 0, 0, .1);--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--radius-xl: 16px;--radius-full: 9999px;--border-color: var(--color-gray-200);--overlay-backdrop: rgba(0, 0, 0, .5);--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 2px 8px rgba(0, 0, 0, .08);--shadow-lg: 0 4px 16px rgba(0, 0, 0, .1);--shadow-input: 0 2px 10px rgba(0, 0, 0, .08);--btn-height-sm: 30px;--btn-height-md: 36px;--btn-height-lg: 42px;--input-height: 40px;--icon-size-sm: 18px;--icon-size-md: 20px;--z-dropdown: 10;--z-index-modal: 1000;--z-index-skip-link: 9999;--opacity-disabled: .5;--transition-fast: .15s ease;--transition-base: .2s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}body{font-family:var(--font-family);font-size:var(--font-size-base);font-weight:var(--font-weight-regular);line-height:var(--line-height-base);color:var(--color-gray-900);background-color:var(--color-white)}a{color:inherit;text-decoration:none}button{font-family:inherit;font-size:inherit;cursor:pointer;border:none;background:none}input,select,textarea{font-family:inherit;font-size:inherit}img,svg{display:block;max-width:100%}table{border-collapse:collapse;width:100%}ul,ol{list-style:none}h1,h2,h3,h4,h5,h6{font-weight:var(--font-weight-semibold);line-height:var(--line-height-tight)}h1{font-size:var(--font-size-3xl);font-weight:var(--font-weight-bold)}h2{font-size:var(--font-size-2xl);font-weight:var(--font-weight-semibold)}h3{font-size:var(--font-size-xl);font-weight:var(--font-weight-semibold)}h4{font-size:var(--font-size-lg);font-weight:var(--font-weight-semibold)}small{font-size:var(--font-size-sm)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}.sr-only--focusable:focus{position:fixed;top:var(--space-2);left:var(--space-2);width:auto;height:auto;padding:var(--space-2) var(--space-4);margin:0;overflow:visible;clip:auto;white-space:normal;background-color:var(--color-accent);color:var(--color-accent-text);border-radius:var(--radius-md);font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);z-index:var(--z-index-skip-link)}.app-loading{display:flex;align-items:center;justify-content:center;height:100vh;height:100dvh;font-family:var(--font-family);font-size:var(--font-size-base);color:var(--color-gray-500)}