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1px 3px #0006;--cv-shadow-md:0 4px 12px #00000080;--cv-shadow-lg:0 8px 24px #0009}[data-theme=light]{color-scheme:light}*,:after,:before{box-sizing:border-box}body{-webkit-font-smoothing:antialiased;background-color:#f5f5f5;background-color:var(--cv-bg-page);color:#111;color:var(--cv-text-primary);margin:0;transition:background-color .3s ease,color .3s ease;transition:background-color var(--cv-transition-slow),color var(--cv-transition-slow)}.cv-theme-toggle,body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-family:var(--cv-font-ui)}.cv-theme-toggle{align-items:center;background:#fff;background:var(--cv-bg-raised);border:1px solid #0000003d;border:1px solid var(--cv-border-strong);border-radius:999px;border-radius:var(--cv-radius-pill);color:#555;color:var(--cv-text-secondary);cursor:pointer;display:inline-flex;font-size:13px;gap:8px;padding:6px 14px;transition:background .1s ease,color .1s ease;transition:background var(--cv-transition-fast),color var(--cv-transition-fast)}.cv-theme-toggle:hover{background:#efefef;background:var(--cv-bg-sunken);color:#111;color:var(--cv-text-primary)}.cv-theme-toggle .cv-theme-icon{font-size:15px;line-height:1}.cv-app{background-color:var(--cv-bg-page);display:flex;flex-direction:column;min-height:100dvh}.cv-header{align-items:center;background:var(--cv-bg-surface);border-bottom:1px solid var(--cv-border);display:flex;gap:12px;justify-content:space-between;padding:12px 20px}.cv-header-title{color:var(--cv-text-primary);font-size:18px;font-weight:600;margin:0}.cv-main{align-items:flex-start;display:flex;flex:1 1;justify-content:center;padding:24px 16px}.cv-calculator{background:var(--cv-bg-surface);border:1px solid var(--cv-border);border-radius:var(--cv-radius-lg);box-shadow:var(--cv-shadow-lg);max-width:420px;overflow:hidden;width:100%}.cv-display{align-items:flex-end;background:var(--cv-display-bg);display:flex;flex-direction:column;gap:4px;min-height:100px;padding:20px 20px 16px}.cv-display__expr{color:var(--cv-display-expr);font-size:13px;min-height:18px}.cv-display__expr,.cv-display__value{font-family:var(--cv-font-mono);text-align:right;word-break:break-all}.cv-display__value{color:var(--cv-display-text);font-size:36px;font-weight:300;line-height:1.2}.cv-keypad{grid-gap:1px;background:var(--cv-border);display:grid;gap:1px;grid-template-columns:repeat(4,1fr);padding:1px}.cv-keypad--scientific{grid-template-columns:repeat(5,1fr)}.cv-btn{-webkit-tap-highlight-color:transparent;align-items:center;border:none;border-radius:0;cursor:pointer;display:flex;font-family:var(--cv-font-ui);font-size:18px;font-weight:400;justify-content:center;min-height:60px;min-width:44px;outline:none;padding:0 8px;touch-action:manipulation;transition:background-color var(--cv-transition-fast),transform var(--cv-transition-fast);-webkit-user-select:none;user-select:none}.cv-btn:active{transform:scale(.94)}.cv-btn:focus-visible{outline:2px solid var(--cv-accent);outline-offset:-2px;z-index:1}.cv-btn--digit{background:var(--cv-btn-digit-bg);color:var(--cv-btn-digit-text)}.cv-btn--digit:hover{background:var(--cv-btn-digit-hover)}.cv-btn--operator{background:var(--cv-btn-op-bg);color:var(--cv-btn-op-text);font-weight:500}.cv-btn--operator:hover{background:var(--cv-btn-op-hover)}.cv-btn--function{background:var(--cv-btn-fn-bg);color:var(--cv-btn-fn-text);font-size:14px}.cv-btn--function:hover{background:var(--cv-btn-fn-hover)}.cv-btn--equals{background:var(--cv-btn-eq-bg);color:var(--cv-btn-eq-text);font-weight:600}.cv-btn--equals:hover{background:var(--cv-btn-eq-hover)}.cv-btn--clear{background:var(--cv-btn-clear-bg);color:var(--cv-btn-clear-text);font-weight:500}.cv-btn--clear:hover{background:var(--cv-btn-clear-hover)}.cv-btn--wide{grid-column:span 2}.cv-history{background:var(--cv-bg-surface);border:1px solid var(--cv-border);border-radius:var(--cv-radius-md);overflow:hidden}.cv-history__header{align-items:center;background:var(--cv-bg-raised);border-bottom:1px solid var(--cv-border);display:flex;justify-content:space-between;padding:10px 16px}.cv-history__title{color:var(--cv-text-secondary);font-size:13px;font-weight:500;margin:0}.cv-history__list{list-style:none;margin:0;max-height:280px;overflow-y:auto;overscroll-behavior:contain;padding:0}.cv-history__item{align-items:flex-end;border-bottom:1px solid var(--cv-border);cursor:pointer;display:flex;flex-direction:column;gap:2px;padding:10px 16px;transition:background var(--cv-transition-fast)}.cv-history__item:last-child{border-bottom:none}.cv-history__item:hover{background:var(--cv-bg-overlay)}.cv-history__expr{color:var(--cv-text-muted);font-family:var(--cv-font-mono);font-size:12px}.cv-history__result{color:var(--cv-text-primary);font-family:var(--cv-font-mono);font-size:16px}.cv-sr-only{clip:rect(0,0,0,0);height:1px;overflow:hidden;position:absolute;white-space:nowrap;width:1px}.cv-visually-hidden{@extend .cv-sr-only}@media (max-width:900px){.cv-main{padding:20px 12px}.cv-calculator{max-width:480px}}@media (max-width:600px){.cv-header{padding:10px 14px}.cv-header-title{font-size:16px}.cv-main{align-items:flex-start;padding:12px 8px}.cv-calculator{border-radius:var(--cv-radius-md);max-width:100%}.cv-display{min-height:88px;padding:16px 16px 12px}.cv-display__value{font-size:30px}.cv-btn{font-size:16px;min-height:56px}.cv-btn--function{font-size:12px}}@media (max-width:400px){.cv-display__value{font-size:26px}.cv-btn{font-size:15px;min-height:52px}.cv-btn--function{font-size:11px}}@media (max-width:768px) and (orientation:landscape){.cv-main{padding:8px}.cv-calculator{display:grid;grid-template-columns:1fr 1.6fr;max-height:96dvh;max-width:640px}.cv-display{justify-content:flex-end;min-height:0;min-height:auto;overflow-y:auto}.cv-keypad{max-height:96dvh;overflow-y:auto}.cv-btn{min-height:48px}}@media (prefers-reduced-motion:reduce){.cv-btn{transition:none}.cv-btn:active{transform:none}body{transition:none}}[data-site-theme=partial]{--ink:#16120a;--ink-2:#2a2418;--paper:#f4ede0;--paper-2:#fdf8f0;--card:#fdf8f0;--line:#d4c4a8;--muted:#5c4f3a;--gold:#a0720a;--gold-2:#c89318;--teal:#3a5f32;--blue:#1a3358;--plum:#7c2f0a;--shadow:0 2px 14px #16120a1a;--shadow-sm:0 1px 6px #16120a12;--shadow-hard:0 8px 32px #16120a24;--error:#7c2f0a;--chat-on-accent:#fdf8f0;--chat-header-bg:#16120a;--chat-text-on-fill:#fdf8f0;--header-h:72px;--cv-bg-page:#f4ede0;--cv-bg-surface:#fdf8f0;--cv-bg-raised:#fdf8f0;--cv-bg-sunken:#f4ede0;--cv-border:#d4c4a8;--cv-text-primary:#16120a;--cv-text-secondary:#5c4f3a;--cv-text-muted:#7a6b52;--cv-accent:#a0720a;--cv-accent-hover:#c89318;--cv-accent-light:#a0720a1f;--cv-accent-text:#a0720a;--cv-input-bg:#fdf8f0;--cv-input-border:#d4c4a8;--cv-btn-eq-bg:#a0720a;--cv-btn-eq-hover:#c89318;--cv-btn-eq-text:#fdf8f0;--cv-btn-digit-bg:#fdf8f0;--cv-btn-digit-text:#16120a;--cv-btn-digit-hover:#f4ede0;--cv-btn-op-bg:#f0e4cb;--cv-btn-op-text:#8a6209;--cv-btn-op-hover:#e8d9b8;--cv-btn-fn-bg:#fdf8f0;--cv-btn-fn-text:#5c4f3a;--cv-btn-fn-hover:#f4ede0;--cv-btn-clear-bg:#f0e4cb;--cv-btn-clear-text:#7c2f0a;--cv-btn-clear-hover:#e8d9b8}[data-site-theme=partial][data-theme=dark]{--ink:#f4ede0;--ink-2:#e8dcc8;--paper:#12100c;--paper-2:#1a1610;--card:#211c14;--line:#3d3428;--muted:#b8a88a;--gold:#c89318;--gold-2:#e0b04a;--teal:#5a8f52;--blue:#2a4a78;--plum:#a04520;--cv-bg-page:#12100c;--cv-bg-surface:#211c14;--cv-bg-raised:#211c14;--cv-bg-sunken:#1a1610;--cv-border:#3d3428;--cv-text-primary:#f4ede0;--cv-text-secondary:#b8a88a;--cv-text-muted:#9a8a72;--cv-accent:#e0b04a;--cv-accent-hover:#f0c66f;--cv-accent-light:#c8931826;--cv-input-bg:#1a1610;--cv-input-border:#3d3428;--cv-btn-eq-bg:#c89318;--cv-btn-eq-text:#16120a;--cv-btn-eq-hover:#e0b04a;--cv-btn-digit-bg:#211c14;--cv-btn-digit-text:#f4ede0;--cv-btn-digit-hover:#2a2418;--cv-btn-op-bg:#2a2216;--cv-btn-op-text:#e0b04a;--cv-btn-op-hover:#332a1a;--cv-btn-fn-bg:#1a1610;--cv-btn-fn-text:#b8a88a;--cv-btn-fn-hover:#241e14;--cv-btn-clear-bg:#3a251a;--cv-btn-clear-text:#e0956a;--cv-btn-clear-hover:#462c1e}[data-site-theme=partial] body{background:var(--paper);color:var(--ink);font-family:Lora,Georgia,serif}[data-site-theme=partial] body:before{display:none}[data-site-theme=partial] .site-header{-webkit-backdrop-filter:none;backdrop-filter:none;background:#16120a;border-bottom:3px solid var(--gold);box-shadow:var(--shadow-sm);color:#f4ede0;gap:.5rem;min-height:var(--header-h)}[data-site-theme=partial] .site-brand:before,[data-site-theme=partial] .site-header:after{display:none}[data-site-theme=partial] .site-brand{color:#f4ede0;flex-shrink:0;font-family:Playfair Display,Georgia,serif;min-width:0}[data-site-theme=partial] .brand-mark{background:linear-gradient(135deg,var(--gold-2),var(--gold));border-radius:6px;box-shadow:0 4px 12px #a0720a59;color:#16120a}[data-site-theme=partial] .brand-text{grid-gap:.15rem;display:grid;gap:.15rem;line-height:1.05;min-width:0}[data-site-theme=partial] .brand-text span{font-size:.95rem;white-space:nowrap}[data-site-theme=partial] .brand-text small{color:#f4ede0a6;font-family:JetBrains Mono,monospace;font-size:.58rem;letter-spacing:.12em;text-transform:uppercase}[data-site-theme=partial] .site-nav{background:#0000;border:none;border-radius:0;flex:1 1 auto;gap:0;margin-left:0;max-width:none;min-width:0;padding:0;scrollbar-color:#c8931873 #0000}[data-site-theme=partial] .site-nav::-webkit-scrollbar-thumb{background:#c8931873}[data-site-theme=partial] .site-nav a{border:none;border-bottom:2px solid #0000;border-radius:0;color:#f4ede0c7;font-family:Source Sans\ 3,system-ui,sans-serif;font-size:.74rem;font-weight:600;letter-spacing:.03em;padding:.9rem .55rem;white-space:nowrap}[data-site-theme=partial] .site-nav a.active,[data-site-theme=partial] .site-nav a:hover{background:#a0720a24;border-bottom-color:var(--gold);box-shadow:none;color:var(--gold-2)}[data-site-theme=partial] .site-nav a.active:after{display:none}[data-site-theme=partial] .header-controls{flex-shrink:0;margin-left:auto}[data-site-theme=partial] .hamburger,[data-site-theme=partial] .theme-toggle{background:#ffffff0f;border:1px solid #d4c4a840;border-radius:6px;color:#f4ede0;font-size:.76rem;font-weight:700;height:38px;min-width:44px;padding:0 .65rem;width:auto}[data-site-theme=partial] .hamburger:hover,[data-site-theme=partial] .theme-toggle:hover{background:#a0720a38;border-color:var(--gold);color:var(--gold-2)}[data-site-theme=partial] .hamburger span{background:#f4ede0}[data-site-theme=partial] .header-login{color:#f4ede0e0}[data-site-theme=partial] .header-login:hover{color:var(--gold-2)}[data-site-theme=partial] .header-signup{background:var(--gold);border:1px solid var(--gold-2);color:#fdf8f0}[data-site-theme=partial] .header-signup:hover{background:var(--gold-2);color:#16120a;opacity:1}[data-site-theme=partial] .header-user .header-avatar{background:var(--gold);border:none;color:#fdf8f0}[data-site-theme=partial] .mobile-nav{background:#16120a;border-bottom:1px solid #a0720a59}[data-site-theme=partial] .mobile-nav a{color:#f4ede0cc}[data-site-theme=partial] .mobile-nav a.active,[data-site-theme=partial] .mobile-nav a:hover{background:#a0720a26;color:var(--gold-2)}[data-site-theme=partial] .site-footer{background:#16120a;border-bottom:none;border-top:3px solid var(--gold);color:#f4ede0bf}[data-site-theme=partial] .site-footer a{color:var(--gold-2)}[data-site-theme=partial] .guide-card,[data-site-theme=partial] .home-stats,[data-site-theme=partial] .tool-strip{background:var(--card);border:1px solid var(--line);box-shadow:var(--shadow-sm)}[data-site-theme=partial] .guide-card h3,[data-site-theme=partial] .guide-section h2,[data-site-theme=partial] .section-kicker,[data-site-theme=partial] .tool-strip h2{color:var(--ink);font-family:Playfair Display,Georgia,serif}[data-site-theme=partial] .eyebrow,[data-site-theme=partial] .section-kicker{color:var(--gold);font-family:JetBrains Mono,monospace;letter-spacing:.18em}[data-site-theme=partial] .primary-action{background:linear-gradient(135deg,var(--gold),var(--gold-2));border-color:#0000;color:#16120a;font-weight:700}[data-site-theme=partial] .secondary-action{background:var(--card);border-color:var(--line);color:var(--ink)}[data-site-theme=partial] .home-page{background:var(--paper);color:var(--ink)}[data-site-theme=partial] .home-page .guide-section{margin:0 auto;max-width:1100px;padding:3rem clamp(1rem,4vw,2.5rem)}[data-site-theme=partial] .home-page .guide-section>p{color:var(--muted);font-family:Lora,Georgia,serif;font-size:1.05rem}[data-site-theme=partial] .auth-page{background:var(--paper)}[data-site-theme=partial] .auth-card{background:var(--card);border-color:var(--line)}[data-site-theme=partial] .volume-calc-page{background:var(--paper)!important;min-height:calc(100vh - var(--header-h));padding:2.5rem 1.25rem}[data-site-theme=partial] .volume-calc-inner{margin:0 auto;max-width:1400px}[data-site-theme=partial] .volume-calc-page h1{color:var(--ink)!important;font-family:Playfair Display,Georgia,serif;font-size:clamp(2rem,5vw,3rem);font-weight:900;margin:0 0 .75rem;text-align:center;text-shadow:none!important}[data-site-theme=partial] .volume-calc-page .volume-calc-hero p,[data-site-theme=partial] .volume-calc-page p[style*="rgba(255,255,255"]{color:var(--muted)!important;font-size:1.05rem;margin:0 0 2rem;text-align:center}[data-site-theme=partial] .study-guide-page{background:var(--paper)}[data-site-theme=partial] .tool-hero{background:repeating-linear-gradient(45deg,#0000,#0000 40px,#c8922a0f 0,#c8922a0f 41px),#16120a;color:#f4ede0;overflow:hidden;padding:clamp(3rem,7vw,4.5rem) clamp(1rem,4vw,2rem) clamp(2.5rem,6vw,3.5rem)}[data-site-theme=partial] .tool-hero>div{margin:0 auto;max-width:1160px}[data-site-theme=partial] .tool-hero .tool-hero-kicker{color:#c89318;font-family:Source Sans\ 3,system-ui,sans-serif;font-size:.72rem;font-weight:700;letter-spacing:.18em;margin:0 0 .75rem;text-transform:uppercase}[data-site-theme=partial] .tool-hero h1{color:#f4ede0;font-family:Playfair Display,Georgia,serif;font-size:clamp(2.2rem,5.5vw,3.6rem);font-weight:900;line-height:1.12;margin:0;max-width:900px;text-align:left}[data-site-theme=partial] .tool-hero .tool-hero-sub{color:#faf7f2b8;font-size:clamp(1rem,2vw,1.12rem);line-height:1.7;margin:1.15rem 0 0;max-width:720px;text-align:left}[data-site-theme=partial] .partial-derivatives-guide .ch-hdr,[data-site-theme=partial] .vector-calculus-guide header{padding:clamp(3rem,7vw,4.5rem) clamp(1rem,4vw,2rem) clamp(2.5rem,6vw,3.5rem)}[data-site-theme=partial] .partial-derivatives-guide .ch-title,[data-site-theme=partial] .vector-calculus-guide header h1{font-size:clamp(2.2rem,5.5vw,3.6rem);line-height:1.12}[data-site-theme=partial] 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