:root{--font-sans: -apple-system, "SF Pro Text", system-ui, sans-serif;--font-mono: "SF Mono", "Fira Code", "Cascadia Code", monospace;--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 48px;--space-3xl: 64px;--text-xs: .75rem;--text-sm: .875rem;--text-base: 1rem;--text-lg: 1.25rem;--text-xl: 1.5rem;--text-2xl: 2rem;--text-3xl: 2.5rem;--leading-tight: 1.2;--leading-normal: 1.5;--leading-relaxed: 1.7;--weight-regular: 400;--weight-medium: 500;--weight-semibold: 600;--weight-bold: 700;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-full: 9999px;--ease-spring: cubic-bezier(.34, 1.56, .64, 1);--ease-out: cubic-bezier(.25, .46, .45, .94);--duration-fast: .15s;--duration-normal: .25s;--duration-slow: .4s;--border-hairline: .5px solid;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 2px 8px rgba(0, 0, 0, .06);--color-bg: #ffffff;--color-bg-secondary: #f5f5f7;--color-bg-tertiary: #e8e8ed;--color-text: 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var(--space-md);border-radius:var(--radius-sm);border:var(--border-hairline) var(--color-border);background:var(--color-bg);color:var(--color-text);width:100%;transition:border-color var(--duration-fast) var(--ease-spring)}input:focus,textarea:focus,select:focus{outline:none;border-color:var(--color-accent);box-shadow:0 0 0 3px var(--color-accent-soft)}.app-shell{display:flex;height:100dvh;overflow:hidden}.app-main{flex:1;display:flex;flex-direction:column;min-width:0;height:100dvh;overflow:hidden}.sidebar{display:none;width:var(--sidebar-width);min-width:var(--sidebar-width);height:100dvh;border-right:var(--border-hairline) var(--color-border);background:var(--color-bg-secondary);flex-direction:column;overflow:hidden}.sidebar-header{display:flex;align-items:center;gap:var(--space-sm);padding:var(--space-md) var(--space-lg);border-bottom:var(--border-hairline) 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var(--ease-spring)}.sidebar-nav-item:hover{background:var(--color-bg-tertiary);color:var(--color-text)}.sidebar-nav-item:focus-visible{outline:2px solid var(--color-accent);outline-offset:-2px}.sidebar-nav-item--active,.sidebar-nav-item--active:hover{background:var(--color-accent-soft);color:var(--color-accent)}.sidebar-conversations{flex:1;overflow-y:auto;padding:var(--space-sm) 0}@media(min-width:768px){.sidebar{display:flex}}.tab-bar{display:flex;position:fixed;bottom:0;left:0;right:0;height:var(--tab-bar-height);background:var(--color-bg);border-top:var(--border-hairline) var(--color-border);z-index:100;padding-bottom:env(safe-area-inset-bottom,0)}.tab-bar-item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;padding:var(--space-xs) 0;border:none;border-radius:0;background:transparent;color:var(--color-text-tertiary);cursor:pointer;transition:color var(--duration-fast) 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var(--ease-spring)}.chat-input-btn:hover{background:var(--color-bg-secondary);color:var(--color-text-secondary)}.chat-input-btn:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.chat-input-btn:disabled{opacity:.4;cursor:not-allowed}.chat-input-send{color:var(--color-accent)}.chat-input-send:hover{background:var(--color-accent-soft);color:var(--color-accent)}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:var(--space-3xl) 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infinite}.convo-loader-line--short{width:60%}.convo-loader-line--long{width:85%}@keyframes convo-loader-pulse{0%,to{opacity:.4}50%{opacity:.8}}.convo-row{display:flex;align-items:flex-start;gap:var(--space-sm);width:100%;padding:var(--space-sm) var(--space-lg);border:none;border-radius:0;background:transparent;color:var(--color-text);text-align:left;cursor:pointer;transition:background var(--duration-fast) var(--ease-spring)}.convo-row:hover{background:var(--color-bg-tertiary)}.convo-row:focus-visible{outline:2px solid var(--color-accent);outline-offset:-2px}.convo-row--active,.convo-row--active:hover{background:var(--color-accent-soft)}.convo-row-content{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}.convo-row-title{font-size:var(--text-sm);font-weight:var(--weight-medium);color:var(--color-text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.convo-row-preview{font-size:var(--text-xs);color:var(--color-text-tertiary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;line-height:1.3}.convo-row-time{font-size:11px;color:var(--color-text-tertiary);white-space:nowrap;flex-shrink:0;padding-top:1px}.screen-header{padding:var(--space-lg) var(--space-lg) var(--space-sm);border-bottom:var(--border-hairline) var(--color-border-subtle)}.screen-title{font-size:var(--text-xl);font-weight:var(--weight-semibold);color:var(--color-text)}.screen-subtitle{font-size:var(--text-sm);color:var(--color-text-secondary);margin-top:var(--space-xs)}.screen-insights,.screen-settings{height:100%;overflow-y:auto;padding-bottom:var(--space-3xl)}.insights-placeholder{display:flex;flex-direction:column;gap:var(--space-md);padding:var(--space-lg)}.insight-card{background:var(--color-card-bg);border:var(--border-hairline) var(--color-card-border);border-radius:var(--radius-md);padding:var(--space-lg);transition:border-color var(--duration-normal) var(--ease-spring)}.insight-card:hover{border-color:var(--color-border)}.insight-card-title{font-size:var(--text-base);font-weight:var(--weight-semibold);color:var(--color-text);margin-bottom:var(--space-sm)}.insight-card-body{font-size:var(--text-sm);color:var(--color-text-secondary);line-height:var(--leading-relaxed)}.settings-section{margin-top:var(--space-lg)}.settings-section-title{font-size:var(--text-xs);text-transform:uppercase;letter-spacing:.06em;color:var(--color-text-tertiary);font-weight:var(--weight-medium);padding:0 var(--space-lg) var(--space-sm)}.settings-section-body{background:var(--color-card-bg);border-top:var(--border-hairline) var(--color-card-border);border-bottom:var(--border-hairline) var(--color-card-border)}.settings-row{display:flex;align-items:center;justify-content:space-between;padding:var(--space-md) var(--space-lg);border-bottom:var(--border-hairline) var(--color-border-subtle);text-decoration:none;color:var(--color-text);transition:background 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var(--ease-out);font-weight:var(--weight-medium)}.settings-segment-btn:hover{color:var(--color-text)}.settings-segment-btn--active{background:var(--color-bg);color:var(--color-text);box-shadow:var(--shadow-sm)}.settings-row--action{cursor:pointer}.settings-row--action:hover{background:var(--color-bg-secondary)}.settings-row--action:focus-visible{outline:2px solid var(--color-accent);outline-offset:-2px}.settings-row-label--danger{color:var(--color-error)}.settings-input{font-family:var(--font-sans);font-size:var(--text-sm);padding:6px 10px;border:var(--border-hairline) var(--color-border);border-radius:var(--radius-sm);background:var(--color-bg-secondary);color:var(--color-text);outline:none;width:120px;transition:border-color var(--duration-fast) var(--ease-out)}.settings-input:focus{border-color:var(--color-accent);box-shadow:0 0 0 2px 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