:root{--color-background: #F8F7F4;--color-background-alt: #F0EFEC;--color-surface: #FFFFFF;--color-text: #1a1a1a;--color-text-muted: #666666;--color-accent: #C4785A;--color-accent-dark: #A85D42;--color-border: #E5E4E1;--color-success: #34A853;--color-error: #EA4335;--font-serif: "Georgia", "Times New Roman", serif;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "SF Mono", "Fira Code", monospace;--space-xs: .5rem;--space-sm: 1rem;--space-md: 1.5rem;--space-lg: 2rem;--space-xl: 3rem;--sidebar-width: 240px;--header-height: 64px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px}body{font-family:var(--font-sans);background-color:var(--color-background);color:var(--color-text);line-height:1.5;-webkit-font-smoothing:antialiased}.app{display:flex;min-height:100vh}.sidebar{width:var(--sidebar-width);background:var(--color-surface);border-right:1px solid var(--color-border);display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;z-index:100}.sidebar__header{padding:var(--space-md);border-bottom:1px solid var(--color-border)}.sidebar__logo{font-family:var(--font-serif);font-size:1.5rem;color:var(--color-text);text-decoration:none}.sidebar__nav{flex:1;padding:var(--space-sm)}.sidebar__link{display:flex;align-items:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-sm);color:var(--color-text-muted);text-decoration:none;border-radius:6px;font-size:.95rem;transition:all .15s ease}.sidebar__link:hover{background:var(--color-background);color:var(--color-text)}.sidebar__link--active{background:var(--color-background);color:var(--color-text);font-weight:500}.sidebar__link svg{width:20px;height:20px;opacity:.7}.sidebar__footer{padding:var(--space-sm);border-top:1px solid var(--color-border)}.main{flex:1;margin-left:var(--sidebar-width);min-height:100vh}.main__header{height:var(--header-height);padding:0 var(--space-lg);display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--color-border);background:var(--color-surface);position:sticky;top:0;z-index:50}.main__title{font-family:var(--font-serif);font-size:1.25rem;font-weight:400}.main__content{padding:var(--space-lg);max-width:1000px}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:8px;padding:var(--space-md);margin-bottom:var(--space-md)}.card__header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-sm)}.card__title{font-size:1rem;font-weight:600}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-xs);padding:.625rem 1rem;font-family:var(--font-sans);font-size:.9rem;font-weight:500;border:none;border-radius:6px;cursor:pointer;transition:all .15s ease;text-decoration:none}.btn--primary{background:var(--color-text);color:var(--color-background)}.btn--primary:hover{background:#333}.btn--secondary{background:transparent;color:var(--color-text);border:1px solid var(--color-border)}.btn--secondary:hover{border-color:var(--color-text)}.btn--ghost{background:transparent;color:var(--color-text-muted)}.btn--ghost:hover{color:var(--color-text);background:var(--color-background)}.btn--sm{padding:.375rem .75rem;font-size:.85rem}.input{width:100%;padding:.75rem 1rem;font-family:var(--font-sans);font-size:1rem;border:1px solid var(--color-border);border-radius:6px;background:var(--color-surface);color:var(--color-text);transition:border-color .15s ease}.input:focus{outline:none;border-color:var(--color-text)}.input::placeholder{color:var(--color-text-muted)}.label{display:block;font-size:.9rem;font-weight:500;margin-bottom:var(--space-xs)}.message{padding:var(--space-sm) var(--space-md);border-radius:16px;max-width:80%;font-size:.95rem;line-height:1.5}.message--inbound{background:var(--color-background);align-self:flex-start;border-bottom-left-radius:4px}.message--outbound{background:var(--color-text);color:var(--color-background);align-self:flex-end;border-bottom-right-radius:4px}.message__time{font-size:.75rem;color:var(--color-text-muted);margin-top:4px}.empty{text-align:center;padding:var(--space-xl);color:var(--color-text-muted)}.empty__icon{font-size:3rem;margin-bottom:var(--space-sm);opacity:.5}.empty__title{font-size:1.1rem;font-weight:500;margin-bottom:var(--space-xs);color:var(--color-text)}.loading{display:flex;align-items:center;justify-content:center;padding:var(--space-xl)}.spinner{width:24px;height:24px;border:2px solid var(--color-border);border-top-color:var(--color-text);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media(max-width:768px){.sidebar{transform:translate(-100%)}.sidebar--open{transform:translate(0)}.main{margin-left:0}}