:root{--bg:#fafafa;--bg-elevated:#ffffff;--bg-muted:#f4f4f5;--border:#e5e7eb;--border-strong:#d4d4d8;--fg:#18181b;--fg-muted:#52525b;--fg-faint:#a1a1aa;--accent:#0a7c40;--accent-hover:#086032;--accent-soft:#ecfdf5;--danger:#b91c1c;--danger-soft:#fef2f2;--radius-sm:6px;--radius:10px;--radius-lg:14px;--shadow-sm:0 1px 2px rgba(0,0,0,0.04);--shadow:0 4px 16px rgba(0,0,0,0.06);--font-sans:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Inter,"Helvetica Neue",Arial,sans-serif;--font-mono:ui-monospace,SFMono-Regular,"SF 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1.25rem;height:56px;display:flex;align-items:center;gap:1rem}.brand{display:inline-flex;align-items:center;gap:.5rem;font-weight:600;color:var(--fg);font-size:16px;letter-spacing:-.01em}.brand:hover{text-decoration:none}.brand__dot{width:10px;height:10px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}.nav{display:flex;align-items:center;gap:1.25rem;margin-left:auto}.nav a{color:var(--fg-muted);font-size:14px}.nav a:hover{color:var(--fg);text-decoration:none}.user-chip{display:inline-flex;align-items:center;gap:.5rem;padding:4px 10px 4px 4px;background:var(--bg-muted);border:1px solid var(--border);border-radius:999px;font-size:13px;color:var(--fg-muted)}.user-chip__avatar{width:22px;height:22px;border-radius:50%;background:var(--accent);font-size:11px;font-weight:600}.btn,.user-chip__avatar{color:#fff;display:inline-flex;align-items:center;justify-content:center}.btn{gap:.4rem;padding:.55rem 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var(--accent-soft)}.input::placeholder{color:var(--fg-faint)}.label{display:block;font-size:13px;font-weight:500;color:var(--fg-muted);margin-bottom:.4rem}.alert{border-radius:var(--radius-sm);border:1px solid var(--danger);background:var(--danger-soft);color:var(--danger)}.alert,.notice{padding:.75rem 1rem;font-size:14px}.notice{border-radius:var(--radius-sm);background:var(--accent-soft);color:var(--accent-hover)}.card,.notice{border:1px solid var(--border)}.card{background:var(--bg-elevated);border-radius:var(--radius);box-shadow:var(--shadow-sm)}.landing{max-width:1080px;margin:0 auto;padding:4rem 1.25rem 6rem}.hero{text-align:center;margin-bottom:3.5rem}.hero__eyebrow{display:inline-block;padding:.25rem .65rem;font-size:12px;letter-spacing:.05em;text-transform:uppercase;color:var(--accent);background:var(--accent-soft);border-radius:999px;margin-bottom:1.25rem;font-weight:600}.hero__title{font-size:clamp(2rem,4vw,3rem);font-weight:700;letter-spacing:-.02em;margin:0 0 1rem;line-height:1.1}.hero__subtitle{font-size:1.1rem;color:var(--fg-muted);max-width:640px;margin:0 auto 2rem}.hero__cta{display:inline-flex;gap:.75rem}.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));grid-gap:1rem;gap:1rem}.feature{padding:1.5rem}.feature__icon{width:36px;height:36px;border-radius:var(--radius-sm);background:var(--accent-soft);color:var(--accent);display:inline-flex;align-items:center;justify-content:center;font-size:18px;margin-bottom:.75rem}.feature h3{margin:0 0 .4rem;font-size:16px;font-weight:600}.feature p{margin:0;color:var(--fg-muted);font-size:14px}.auth-page{min-height:calc(100vh - 56px);display:flex;align-items:center;justify-content:center;padding:2rem 1.25rem}.auth-card{width:100%;max-width:420px;padding:2rem}.auth-card h1{margin:0 0 .4rem;font-size:22px;letter-spacing:-.01em}.auth-card p.muted{color:var(--fg-muted);margin:0 0 1.5rem;font-size:14px}.auth-card 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var(--border);border-radius:var(--radius-sm);font-size:12px;color:var(--fg-muted);font-family:var(--font-mono)}.composer{border-top:1px solid var(--border);background:var(--bg-elevated);padding:1rem 1.25rem}.composer__inner{max-width:760px;margin:0 auto;display:flex;gap:.5rem;align-items:flex-end}.composer__textarea{flex:1 1;min-height:44px;max-height:200px;resize:none;padding:.65rem .85rem;font-size:15px;border:1px solid var(--border-strong);border-radius:var(--radius);background:var(--bg-elevated);font-family:inherit;line-height:1.5}.composer__textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.composer__hint{max-width:760px;margin:.5rem auto 0;font-size:12px;color:var(--fg-faint);text-align:center}.spinner{width:14px;height:14px;border-radius:50%;border:2px solid var(--border-strong);border-top-color:var(--accent);animation:spin .7s linear infinite;display:inline-block}.spinner--inline{vertical-align:middle}@keyframes spin{to{transform:rotate(1turn)}}.typing{display:inline-flex;gap:4px;align-items:center;padding:4px 0}.typing span{width:6px;height:6px;border-radius:50%;background:var(--fg-faint);animation:typing 1.2s ease-in-out infinite}.typing span:nth-child(2){animation-delay:.15s}.typing span:nth-child(3){animation-delay:.3s}@keyframes typing{0%,60%,to{transform:translateY(0);opacity:.4}30%{transform:translateY(-4px);opacity:1}}.text-muted{color:var(--fg-muted)}.text-faint{color:var(--fg-faint)}.text-center{text-align:center}.message-md{font-size:15px;line-height:1.55;color:var(--fg)}.message-md>*+*{margin-top:.6em}.message-md p{margin:0}.message-md ol,.message-md ul{padding-left:1.25rem;margin:0}.message-md li+li{margin-top:.2em}.message-md code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9em;background:var(--bg-muted);border:1px solid var(--border);padding:.05em .35em;border-radius:4px}.message-md pre{background:var(--bg-muted);border:1px solid var(--border);border-radius:6px;padding:.6rem .8rem;overflow-x:auto}.message-md pre code{background:transparent;border:0;padding:0}.message-md table{border-collapse:collapse;font-size:13px}.message-md td,.message-md th{border:1px solid var(--border);padding:.35rem .5rem;text-align:left}.message-md th{background:var(--bg-muted)}.message-md blockquote{border-left:3px solid var(--border-strong);padding-left:.75rem;color:var(--fg-muted)}.citation-chip{display:inline-flex;align-items:center;gap:.25em;background:var(--accent-soft);color:var(--accent-hover);border:1px solid color-mix(in srgb,var(--accent) 30%,transparent);border-radius:999px;padding:.05em .55em;font:inherit;font-size:.85em;font-weight:500;font-feature-settings:"tnum";cursor:pointer;vertical-align:.05em;margin:0 .05em;white-space:nowrap;line-height:1.4}.citation-chip:hover{background:color-mix(in srgb,var(--accent) 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.tool-chip__icon{color:var(--accent)}.tool-chip__label{font-weight:500}.tool-chip__summary{color:var(--fg-muted);font-feature-settings:"tnum"}.tool-chip__summary--err{color:#b91c1c}.spinner--mini{width:10px;height:10px;border-width:1.5px}.spc-modal__backdrop{position:fixed;inset:0;background:rgba(12,12,16,.45);display:flex;align-items:center;justify-content:center;z-index:50;padding:1.25rem;animation:spc-modal-in .12s ease-out}@keyframes spc-modal-in{0%{opacity:0}to{opacity:1}}.spc-modal{background:var(--bg-elevated);width:min(1100px,100%);max-height:min(90vh,900px);border-radius:12px;border:1px solid var(--border);box-shadow:0 24px 48px -16px rgba(0,0,0,.25);display:flex;flex-direction:column;overflow:hidden}.spc-modal__header{display:flex;align-items:center;justify-content:space-between;padding:.85rem 1.25rem;border-bottom:1px solid var(--border)}.spc-modal__title{font-weight:600;font-size:15px}.spc-modal__close{border:0;background:transparent;font-size:22px;line-height:1;color:var(--fg-muted);cursor:pointer;padding:0 .25rem}.spc-modal__close:hover{color:var(--fg)}.spc-modal__state{padding:2rem 1.5rem;color:var(--fg-muted);text-align:center}.spc-modal__state--error{color:#b91c1c}.spc-modal__body{display:grid;grid-template-columns:240px 1fr;min-height:0;flex:1 1}.spc-modal__toc{border-right:1px solid var(--border);background:var(--bg);overflow-y:auto;padding:.5rem 0}.spc-modal__toc-item{display:flex;width:100%;text-align:left;padding:.45rem 1rem;background:transparent;border:0;cursor:pointer;font:inherit;font-size:13px;color:var(--fg-muted);gap:.6em;border-left:3px solid transparent}.spc-modal__toc-item:hover{background:var(--bg-muted);color:var(--fg)}.spc-modal__toc-item--active{background:var(--accent-soft);color:var(--accent-hover);border-left-color:var(--accent);font-weight:500}.spc-modal__toc-id{font-feature-settings:"tnum";font-weight:600;flex-shrink:0;min-width:3rem}.spc-modal__content{overflow-y:auto;padding:1rem 1.5rem 2rem}.spc-modal__section{padding:1rem .75rem;border-radius:8px;scroll-margin-top:.5rem}.spc-modal__section--active{background:var(--accent-soft);box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--accent) 30%,transparent)}.spc-modal__section-head{display:flex;align-items:baseline;gap:.6em;font-size:15px;margin:0 0 .65rem}.spc-modal__section-id{font-weight:700;color:var(--accent);font-feature-settings:"tnum"}.spc-modal__section-pages{margin-left:auto;font-size:12px;color:var(--fg-faint)}.spc-modal__section-text{white-space:pre-wrap;font:inherit;font-size:14px;line-height:1.55;margin:0;color:var(--fg)}