:root{--bg: #ffffff;--bg-soft: #f7f8fa;--text: #0a0a0b;--muted: #5f6470;--subtle: #8a8f99;--border: #e8e9ec;--border-strong: #d7d9de;--accent: #2f6bff;--accent-soft: rgba(47, 107, 255, .08);--ok: #15803d;--ok-soft: #f0fdf4;--bad: #c2410c;--bad-soft: #fff7ed;--font-sans: "Geist", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace;--radius: 12px;--sidebar: 240px;--topbar: 56px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}button{font:inherit;cursor:pointer}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}i{font-style:normal;font-family:var(--font-mono);font-size:.92em}.accent{color:var(--accent)}.muted{color:var(--subtle)}.topbar{position:sticky;top:0;z-index:20;height:var(--topbar);display:flex;align-items:center;justify-content:space-between;padding:0 20px;background:#ffffffd9;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}.brand{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:600;letter-spacing:-.02em}.brand:hover{text-decoration:none}.brand-mark{width:26px;height:26px;border-radius:7px;background:var(--text);color:#fff;display:grid;place-items:center;font-size:.8rem;font-weight:700}.menu-button{display:none;border:1px solid var(--border-strong);background:#fff;border-radius:999px;padding:4px 14px;font-size:.875rem}.sidebar{position:fixed;top:var(--topbar);left:0;bottom:0;width:var(--sidebar);overflow-y:auto;padding:20px 12px 40px;border-right:1px solid var(--border);background:var(--bg);z-index:10}.side-group{margin-top:20px}.side-heading{display:block;padding:0 10px 6px;font-size:.75rem;font-weight:500;color:var(--subtle)}.side-link{display:block;padding:6px 10px;border-radius:8px;color:var(--muted);font-size:.925rem}.side-link:hover{background:var(--bg-soft);color:var(--text);text-decoration:none}.side-link.active{background:var(--accent-soft);color:var(--accent);font-weight:500}.content{margin-left:var(--sidebar);padding:48px clamp(20px,5vw,64px) 32px;min-height:calc(100vh - var(--topbar));display:flex;flex-direction:column}.footer{margin-top:auto;padding-top:48px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 24px;font-size:.85rem;color:var(--subtle);max-width:760px}.footer-links{display:flex;gap:16px}.page{max-width:760px}.page-title{font-size:clamp(2rem,4vw,2.75rem);font-weight:700;line-height:1.1;letter-spacing:-.035em}.page-lead{margin:16px 0 24px;font-size:1.125rem;color:var(--muted);letter-spacing:-.01em}.page p+p{margin-top:12px}.section{margin-top:40px}.section-title{margin-bottom:12px;font-size:1.25rem;font-weight:600;letter-spacing:-.02em}.section>p{color:var(--text);margin-bottom:16px}.formula{margin:0 0 16px;padding:14px 16px;border-left:3px solid var(--accent);background:var(--bg-soft);border-radius:0 8px 8px 0;font-family:var(--font-mono);font-size:.9rem;line-height:1.8;overflow-x:auto}.panel{display:flex;flex-direction:column;gap:16px;padding:20px;border:1px solid var(--border);border-radius:var(--radius);background:#fff;box-shadow:0 1px 2px #0a0a0b0a}.row{display:flex;flex-wrap:wrap;gap:16px}.field{display:flex;flex-direction:column;gap:6px;min-width:0}.row .field{flex:1 1 220px}.row .field--narrow{flex:0 1 180px}.field-label{font-size:.825rem;font-weight:500;color:var(--muted)}.field-hint{font-size:.8rem;color:var(--subtle)}.field-error{font-size:.8rem;color:var(--bad)}.input{width:100%;padding:9px 12px;border:1px solid var(--border-strong);border-radius:8px;background:#fff;color:var(--text);font:inherit;font-size:1rem;resize:vertical;transition:border-color .15s ease,box-shadow .15s ease}.input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.input--mono{font-family:var(--font-mono);font-size:.925rem}.input--error{border-color:var(--bad)}.toggle{display:inline-flex;align-self:flex-start;padding:3px;border-radius:999px;background:var(--bg-soft);border:1px solid var(--border)}.toggle-option{border:0;background:transparent;padding:5px 16px;border-radius:999px;font-size:.875rem;color:var(--muted)}.toggle-option--active{background:#fff;color:var(--text);font-weight:500;box-shadow:0 1px 3px #0a0a0b1a}.actions{display:flex;flex-wrap:wrap;gap:8px}.button{padding:8px 16px;border-radius:999px;font-size:.875rem;font-weight:500;border:1px solid var(--border-strong);background:#fff;color:var(--text);transition:border-color .15s ease,background .15s ease}.button:hover{border-color:var(--text)}.button--primary{background:var(--text);border-color:var(--text);color:#fff}.button--primary:hover{background:var(--accent);border-color:var(--accent)}.output{padding:14px 16px;border-radius:8px;background:var(--bg-soft);border:1px solid var(--border)}.output--error{background:var(--bad-soft);border-color:#fed7aa}.output-head{display:flex;justify-content:space-between;align-items:center}.output-value{margin-top:4px;font-family:var(--font-mono);font-size:1rem;word-break:break-all;white-space:pre-wrap}.output--error .output-value{font-family:var(--font-sans);font-size:.925rem;color:var(--bad);word-break:normal}.copy{border:0;background:none;color:var(--accent);font-size:.8rem}.note{font-size:.875rem;color:var(--muted)}.verdict{padding:10px 14px;border-radius:8px;font-size:.925rem}.verdict--ok{background:var(--ok-soft);color:var(--ok)}.verdict--bad{background:var(--bad-soft);color:var(--bad)}.stats{display:flex;flex-wrap:wrap;gap:8px 32px}.stat dt{font-size:.8rem;color:var(--subtle)}.stat dd{font-family:var(--font-mono);font-size:1rem;word-break:break-all}.example{margin-top:12px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px;border:1px dashed var(--border-strong);border-radius:var(--radius);font-size:.925rem;color:var(--muted)}.example p{flex:1 1 280px}.example b{font-family:var(--font-mono);color:var(--text);word-break:break-all}.table-scroll{overflow-x:auto}.alphabet,.rails{border-collapse:collapse;font-family:var(--font-mono);font-size:.875rem}.alphabet th{padding-right:10px;text-align:left;font-family:var(--font-sans);font-weight:500;font-size:.8rem;color:var(--subtle)}.alphabet td,.rails td{width:1.5em;text-align:center;padding:2px 0}.rails td:not(.accent){color:var(--border-strong)}.aligned{font-family:var(--font-mono);font-size:.9rem;overflow-x:auto;line-height:1.7}.matrix-input{display:grid;grid-template-columns:repeat(2,72px);gap:8px}.matrix-input .input{text-align:center}.matrix{font-family:var(--font-mono)}.parties{display:grid;grid-template-columns:1fr 1fr;gap:16px}.parties .button{align-self:flex-start}.party{font-weight:600}.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;margin-top:8px}.card{display:flex;flex-direction:column;gap:4px;padding:16px;border:1px solid var(--border);border-radius:var(--radius);color:var(--text);transition:border-color .2s ease,box-shadow .2s ease,transform .2s ease}.card:hover{text-decoration:none;border-color:#2f6bff66;box-shadow:0 8px 24px -10px #0a0a0b26;transform:translateY(-2px)}.card-group{font-size:.75rem;color:var(--subtle)}.card-title{font-weight:600;letter-spacing:-.015em}.card-summary{font-size:.875rem;color:var(--muted)}.terms{display:grid;gap:10px}.term{display:grid;grid-template-columns:140px 1fr;gap:16px}.term dt{font-weight:500}.term dd{color:var(--muted)}@media(max-width:860px){.menu-button{display:block}.sidebar{width:100%;bottom:auto;max-height:calc(100vh - var(--topbar));border-right:0;border-bottom:1px solid var(--border);box-shadow:0 12px 24px -12px #0a0a0b33;transform:translateY(-8px);opacity:0;pointer-events:none;transition:opacity .2s ease,transform .2s ease}.sidebar--open{transform:none;opacity:1;pointer-events:auto}.content{margin-left:0;padding-top:32px}.parties{grid-template-columns:1fr}.term{grid-template-columns:1fr;gap:0}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}