@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap";:root{color-scheme:light;--canvas:#f7fbff;--surface:#fff;--surface-muted:#eef7ff;--ink:#171717;--body:#4d4d4d;--mute:#718096;--faint:#a1a1a1;--hairline:#dceaf5;--hairline-soft:#edf4f9;--hairline-strong:#b9d2e5;--link:#1769aa;--focus:#3182ce;--accent-blue:#2479c5;--accent-violet:#805ad5;--accent-pink:#d9578a;--accent-cyan:#168f86;--accent-green:#278b62;--keyboard-done-bg:#dcfce7;--keyboard-done-border:#86efac;--keyboard-done-ink:#166534;--soft-blue:#eaf5ff;--soft-green:#ebfaf2;--soft-purple:#f3efff;--soft-peach:#fff4eb;--shadow:0 16px 44px #3569911a;--max-width:1440px}:root[data-theme=dark]{color-scheme:dark;--canvas:#0b0b0b;--surface:#151515;--surface-muted:#1d1d1d;--ink:#f5f5f5;--body:#b8b8b8;--mute:gray;--faint:#6e6e6e;--hairline:#292929;--hairline-soft:#242424;--hairline-strong:#3a3a3a;--link:#64a8ff;--focus:#64a8ff;--accent-blue:#64a8ff;--accent-violet:#b58cff;--accent-pink:#ff79b0;--accent-cyan:#5de0c5;--accent-green:#6ee7b7;--keyboard-done-bg:#bbf7d0;--keyboard-done-border:#4ade80;--keyboard-done-ink:#14532d;--soft-blue:#102536;--soft-green:#10291f;--soft-purple:#211b32;--soft-peach:#302119;--shadow:0 1px 1px #0003}*{box-sizing:border-box}[hidden]{display:none!important}html{scroll-behavior:smooth}body{background:var(--canvas);min-width:320px;color:var(--body);margin:0;font-family:Inter,Arial,sans-serif;font-size:16px;line-height:1.5}button,input,select{font:inherit}a{color:inherit}button,input,select{touch-action:manipulation;border:0}button{cursor:pointer}a,button{-webkit-tap-highlight-color:transparent}:focus-visible{outline:3px solid var(--focus);outline-offset:3px}body[data-menu-open=true]{overflow:hidden}.site-header{z-index:20;border-bottom:1px solid var(--hairline);background:color-mix(in srgb, var(--canvas) 88%, transparent);backdrop-filter:blur(16px);position:sticky;top:0}.nav-shell{max-width:var(--max-width);justify-content:space-between;align-items:center;gap:24px;min-height:74px;margin:0 auto;padding:0 24px;display:flex}.brand{color:var(--ink);letter-spacing:-.045em;align-items:center;gap:12px;font-weight:700;text-decoration:none;display:inline-flex}.brand-logo{border:1px solid color-mix(in srgb, var(--accent-blue) 24%, var(--hairline));object-fit:cover;border-radius:12px;width:42px;height:42px;transition:transform .18s,box-shadow .18s;display:block;box-shadow:0 5px 14px #2479c52e}.brand-name{color:var(--accent-blue);background:linear-gradient(100deg, var(--accent-blue), var(--accent-violet) 55%, var(--accent-pink));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:24px;line-height:1.1}.brand:hover .brand-logo,.brand:focus-visible .brand-logo{transform:translateY(-1px)rotate(-2deg);box-shadow:0 8px 18px #805ad53d}.site-nav{align-items:center;gap:4px;display:flex}.header-actions{flex:none;align-items:center;gap:4px;display:flex}.site-nav a,.theme-toggle,.nav-dropdown-toggle{color:var(--body);background:0 0;border-radius:999px;padding:8px 12px;font-size:14px;text-decoration:none}.site-nav a:hover,.site-nav a[aria-current=page],.theme-toggle:hover,.nav-dropdown-toggle:hover{background:var(--soft-blue);color:var(--accent-blue)}.nav-dropdown{position:relative}.nav-dropdown-toggle{cursor:pointer;border:0;align-items:center;display:inline-flex}.dropdown-chevron{border-bottom:1.5px solid;border-right:1.5px solid;flex:none;width:7px;height:7px;margin-left:5px;transition:transform .18s;display:inline-block;transform:rotate(45deg)}.nav-dropdown[data-open=true] .dropdown-chevron,.language-picker[open] .dropdown-chevron{transform:rotate(225deg)}.nav-dropdown-menu{z-index:25;border:1px solid var(--hairline);background:var(--surface);border-radius:16px;grid-template-columns:repeat(2,minmax(150px,1fr));gap:8px;width:380px;padding:10px;display:grid;position:absolute;top:calc(100% + 8px);right:0;box-shadow:0 16px 36px #1c476c29}.nav-dropdown-menu a{border:1px solid var(--hairline);min-height:42px;color:var(--body);background:var(--surface-muted);white-space:normal;border-radius:10px;align-items:center;padding:9px 11px;transition:border-color .18s,background .18s,box-shadow .18s,transform .18s;display:flex;box-shadow:0 3px 10px #1c476c0f}.nav-dropdown-menu a:hover,.nav-dropdown-menu a[aria-current=page]{border-color:var(--accent-cyan);color:var(--accent-blue);background:var(--soft-blue);transform:translateY(-1px);box-shadow:0 6px 14px #1c476c1f}.site-info-bar{border-top:1px solid var(--hairline);background:color-mix(in srgb, var(--surface) 72%, transparent)}.site-info-links{justify-content:flex-end;align-items:center;gap:18px;min-height:34px;display:flex}.site-info-links a{color:var(--mute);white-space:nowrap;padding:6px 0;font-size:12px;text-decoration:none}.site-info-links a:hover{color:var(--accent-violet)}.language-picker{position:relative}.language-picker summary{border:1px solid var(--hairline);color:var(--body);cursor:pointer;background:0 0;border-radius:999px;align-items:center;gap:6px;padding:8px 12px;font-size:14px;list-style:none;display:inline-flex}.language-picker .language-icon{color:currentColor;width:16px;height:16px;line-height:1;display:inline-flex}.language-picker .language-icon svg{fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.7px;width:100%;height:100%}.language-menu{grid-template-columns:1fr}.language-picker summary::-webkit-details-marker{display:none}.language-picker summary:hover,.language-picker[open] summary{border-color:var(--accent-cyan);color:var(--accent-cyan);background:var(--soft-blue)}.language-menu{z-index:25;border:1px solid var(--accent-cyan);background:var(--surface);border-radius:14px;gap:2px;min-width:160px;padding:6px;display:grid;position:absolute;top:calc(100% + 8px);right:0;box-shadow:0 14px 34px #1c476c29}.language-menu a{color:var(--body);white-space:nowrap;border-radius:9px;padding:9px 11px;text-decoration:none}.language-menu a:hover,.language-menu a[aria-current=page]{color:var(--accent-blue);background:var(--soft-green)}.theme-toggle{border:1px solid var(--hairline);min-width:40px}.theme-icon{color:currentColor;width:16px;height:16px;line-height:1;display:inline-flex}.theme-icon svg{fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.8px;width:100%;height:100%}.theme-icon-moon,:root[data-theme=dark] .theme-icon-sun{display:none}:root[data-theme=dark] .theme-icon-moon{display:block}.menu-toggle{border:1px solid var(--hairline-strong);width:46px;height:46px;color:var(--accent-blue);background:var(--surface);border-radius:12px;justify-content:center;align-items:center;display:none;box-shadow:0 4px 12px #2479c51a}.menu-toggle:hover,.menu-toggle[aria-expanded=true]{border-color:var(--accent-cyan);color:var(--accent-violet);background:var(--soft-blue)}.hamburger-icon{gap:4px;width:21px;display:grid}.hamburger-icon span{background:currentColor;border-radius:999px;height:2px;transition:transform .18s,opacity .18s;display:block}.menu-toggle[aria-expanded=true] .hamburger-icon span:first-child{transform:translateY(6px)rotate(45deg)}.menu-toggle[aria-expanded=true] .hamburger-icon span:nth-child(2){opacity:0}.menu-toggle[aria-expanded=true] .hamburger-icon span:nth-child(3){transform:translateY(-6px)rotate(-45deg)}.page-shell{overflow:hidden}.hero{border-bottom:1px solid var(--hairline);background:linear-gradient(180deg, var(--soft-blue), var(--canvas) 78%);text-align:center;padding:34px 24px 38px;position:relative}.eyebrow{color:var(--accent-violet);letter-spacing:.08em;text-transform:uppercase;margin:0 0 18px;font-family:JetBrains Mono,monospace;font-size:12px;font-weight:500}.hero h1{max-width:100%;color:var(--ink);background:linear-gradient(100deg, var(--accent-blue), var(--accent-violet) 52%, var(--accent-green));letter-spacing:-.075em;text-wrap:balance;-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin:0 auto;padding:.08em 0 .14em;font-size:clamp(40px,6vw,68px);font-weight:600;line-height:1.08;overflow:visible}.hero-intro{max-width:720px;color:var(--body);margin:16px auto 0;font-size:17px;line-height:1.5}.container{width:min(var(--max-width), calc(100% - 48px));margin:0 auto}.tool-section{background:linear-gradient(180deg, var(--canvas), var(--soft-blue));padding:38px 0 64px}.section-heading{justify-content:space-between;align-items:start;gap:32px;margin-bottom:18px;display:flex}.section-heading>div{flex:55%;min-width:0}.section-heading h2{color:var(--accent-violet);letter-spacing:-.05em;text-wrap:balance;margin:0;font-size:clamp(24px,4vw,34px);line-height:1.08}.section-heading p{max-width:520px;color:var(--body);margin:4px 0 0}.tool-shell{border:1px solid var(--hairline-strong);background:var(--surface);box-shadow:var(--shadow);border-radius:18px;grid-template-columns:300px minmax(0,1fr);display:grid;overflow:hidden}.tool-controls{border-right:1px solid var(--hairline);background:linear-gradient(180deg, var(--soft-green), var(--surface));min-width:0;padding:24px}.control-group{gap:8px;margin-bottom:20px;display:grid}.transform-parent-picker{border-bottom:1px solid var(--hairline);margin-bottom:16px;padding-bottom:16px}.transform-parent-picker label{font-size:14px}.transform-parent-picker select{border-color:var(--hairline-strong);min-height:44px;font-size:13px}.transform-parent-picker .field-help{line-height:1.45}.control-group label,.control-label{color:var(--ink);font-size:13px;font-weight:500}.control-group input,.control-group select{border:1px solid var(--hairline-strong);width:100%;min-height:42px;color:var(--ink);background:var(--surface);border-radius:8px;padding:0 11px}.equation-group input{font-family:JetBrains Mono,monospace;font-size:13px}.keyboard-toggle{border:1px solid var(--hairline);width:100%;min-height:32px;color:var(--body);background:var(--surface);border-radius:7px;margin:-8px 0 16px;font-size:12px}.keyboard-toggle:hover,.keyboard-toggle[aria-expanded=true]{border-color:var(--accent-blue);color:var(--accent-blue)}.equation-keyboard{border:1px solid var(--hairline);background:color-mix(in srgb, var(--surface) 92%, var(--accent-blue));border-radius:10px;margin:-4px 0 18px;padding:10px}.keyboard-header{justify-content:space-between;align-items:center;gap:10px;margin-bottom:8px;display:flex}.keyboard-title{color:var(--ink);font-size:12px;font-weight:600}.keyboard-header-actions{align-items:center;gap:6px;display:flex}.keyboard-header .keyboard-done{border:1px solid var(--keyboard-done-border);min-width:68px;min-height:28px;color:var(--keyboard-done-ink);background:var(--keyboard-done-bg);cursor:pointer;border-radius:6px;padding:4px 10px;font-size:11px;font-weight:700}.keyboard-header .keyboard-done:hover,.keyboard-header .keyboard-done:focus-visible{border-color:var(--accent-green);background:color-mix(in srgb, var(--keyboard-done-bg) 82%, var(--accent-green))}.keyboard-hide{border:1px solid var(--hairline-strong);min-height:28px;color:var(--body);background:var(--surface);cursor:pointer;border-radius:6px;padding:4px 8px;font-size:11px}.keyboard-hide:hover,.keyboard-hide:focus-visible{border-color:var(--accent-blue);color:var(--accent-blue)}.keyboard-sections{gap:10px;display:grid}.keyboard-section{gap:5px;display:grid}.keyboard-section-label{color:var(--mute);letter-spacing:.05em;text-transform:uppercase;font-size:10px;font-weight:700}.keyboard-panel{grid-template-columns:repeat(5,minmax(0,1fr));gap:4px;display:grid}.keyboard-panel.keyboard-functions{grid-template-columns:repeat(3,minmax(0,1fr))}.keyboard-panel button{border:1px solid var(--hairline);min-width:0;min-height:30px;color:var(--ink);background:var(--surface);border-radius:6px;padding:3px 2px;font-family:Inter,ui-sans-serif,sans-serif;font-size:12px}.keyboard-panel button:hover{border-color:var(--accent-blue);color:var(--accent-blue)}.keyboard-panel .keyboard-key-action{color:var(--body);background:var(--surface-muted)}.keyboard-panel .keyboard-done{border-color:var(--keyboard-done-border);min-height:36px;color:var(--keyboard-done-ink);background:var(--keyboard-done-bg);grid-column:1/-1;font-weight:700}.keyboard-panel .keyboard-done:hover,.keyboard-panel .keyboard-done:focus-visible{border-color:var(--accent-green);color:var(--keyboard-done-ink);background:color-mix(in srgb, var(--keyboard-done-bg) 82%, var(--accent-green))}.keyboard-panel sup,.keyboard-panel sub{font-size:.7em}.equation-list{gap:9px;display:grid}.equation-row{gap:5px;display:grid}.equation-row label{color:var(--body);font-family:JetBrains Mono,monospace;font-size:12px}.equation-row.is-active label{color:var(--accent-blue)}.equation-row-input{grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:8px;display:grid}.equation-row-input input{min-width:0}.equation-row-actions{align-items:center;gap:9px;display:inline-flex}.equation-color-dot{background:var(--equation-color);width:10px;height:10px;box-shadow:0 0 0 1px var(--surface), 0 0 0 2px var(--hairline-strong);border-radius:999px}.remove-equation-button{border:1px solid var(--hairline);width:24px;height:24px;color:var(--mute);background:0 0;border-radius:6px;place-items:center;padding:0;font-size:17px;line-height:1;display:grid}.remove-equation-button:hover:not(:disabled){border-color:var(--accent-pink);color:var(--accent-pink);background:color-mix(in srgb, var(--accent-pink) 8%, transparent)}.remove-equation-button:disabled{cursor:not-allowed;opacity:.35}.add-equation-button{border:1px dashed var(--hairline-strong);min-height:34px;color:var(--body);background:0 0;border-radius:7px;font-size:12px}.add-equation-button:hover{border-color:var(--accent-blue);color:var(--accent-blue)}.control-group input:focus,.control-group select:focus{border-color:var(--focus);box-shadow:0 0 0 3px color-mix(in srgb, var(--focus) 18%, transparent);outline:none}.field-help{color:var(--mute);font-size:12px}.formula-guide{color:var(--body);margin:0 0 18px}.formula-label{color:var(--mute);letter-spacing:.06em;text-transform:uppercase;font-family:JetBrains Mono,monospace;font-size:10px;display:block}.formula-expression{color:var(--ink);overflow-wrap:anywhere;margin-top:6px;font-family:JetBrains Mono,monospace;font-size:15px;line-height:1.5;display:block}.coefficient{font-weight:700}.coefficient-a{color:var(--accent-blue)}.coefficient-b{color:var(--accent-violet)}.coefficient-c{color:var(--accent-pink)}.coefficient-d{color:var(--accent-cyan)}.preset-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;min-width:0;display:grid}.preset{border:1px solid var(--hairline);width:100%;min-width:0;min-height:48px;color:var(--body);background:var(--surface);text-align:left;border-radius:6px;padding:6px 8px;font-family:JetBrains Mono,monospace;font-size:11px}.preset-label{align-content:center;gap:3px;min-width:0;display:grid;overflow:hidden}.preset-label>span:last-child{text-overflow:ellipsis;white-space:nowrap;min-width:0;overflow:hidden}.preset-type{color:var(--accent-blue);letter-spacing:.02em;font-family:Inter,ui-sans-serif,sans-serif;font-size:10px;font-weight:700;line-height:1;display:block}.transform-control-help{color:var(--mute);margin:-4px 0 16px;font-size:12px;line-height:1.5}.transform-presets{gap:8px;margin-top:2px;display:grid}.transform-preset{text-align:center;min-height:38px;font-family:Inter,ui-sans-serif,sans-serif;font-size:11px}.preset[data-example-type=Cubic] .preset-type{color:var(--accent-violet)}.preset[data-example-type=Sine] .preset-type{color:var(--accent-pink)}.preset[data-example-type=Cosine] .preset-type{color:var(--accent-cyan)}.preset[data-example-type=Mix] .preset-type{color:var(--accent-green)}.preset[data-example-type=Exponential] .preset-type{color:var(--accent-violet)}.preset[data-example-type=Logarithmic] .preset-type{color:var(--accent-cyan)}.preset[data-example-type=Polynomial] .preset-type{color:var(--accent-pink)}.preset:hover{border-color:var(--accent-blue);color:var(--accent-blue);background:var(--soft-blue);transform:translateY(-1px)}.tool-status{min-height:20px;color:var(--mute);margin-top:14px;font-size:12px}.custom-mode-note{color:var(--body);margin:0 0 20px;font-size:13px;line-height:1.5}.tool-output{background:var(--surface);min-width:0;padding:18px}.graph-toolbar{justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:10px;display:flex}.viewport-readout{color:var(--body);font-variant-numeric:tabular-nums;font-family:JetBrains Mono,monospace;font-size:12px;display:none}.function-value-inline{color:var(--body);white-space:nowrap;align-items:center;gap:6px;margin:0 auto;font-family:JetBrains Mono,monospace;font-size:12px;display:inline-flex}.function-value-inline label{color:var(--body)}.function-value-inline input{border:1px solid var(--hairline-strong);width:70px;min-height:30px;color:var(--ink);background:var(--surface);font:inherit;border-radius:7px;padding:0 8px}.function-value-inline input:focus{border-color:var(--focus);box-shadow:0 0 0 3px color-mix(in srgb, var(--focus) 18%, transparent);outline:none}.function-value-inline output{color:var(--accent-blue);font-variant-numeric:tabular-nums;font-size:16px;font-weight:700}.toolbar-actions{flex-wrap:wrap;justify-content:end;gap:6px;margin-left:auto;display:flex}.graph-action{border:1px solid var(--hairline);min-width:34px;min-height:34px;color:var(--ink);background:var(--surface);border-radius:7px;padding:0 8px;font-size:16px;line-height:1}.graph-action-text{padding:0 10px;font-size:12px}.graph-action:hover{border-color:var(--accent-blue);color:var(--accent-blue)}.graph-color-bar{color:var(--body);flex-wrap:wrap;justify-content:end;align-items:center;gap:8px;margin:0 0 8px;font-size:12px;display:flex}.graph-settings{color:var(--body);flex-wrap:wrap;justify-content:end;align-items:center;gap:14px;margin:0 0 10px;font-size:12px;display:flex}.graph-settings label{align-items:center;gap:6px;display:inline-flex}.graph-settings input{accent-color:var(--accent-blue)}.graph-setting-label{color:var(--body)}.color-options{align-items:center;gap:5px;display:inline-flex}.color-option{border:2px solid var(--surface);background:var(--swatch);width:18px;height:18px;box-shadow:0 0 0 1px var(--hairline-strong);cursor:pointer;border-radius:999px;padding:0}.color-option:hover{transform:scale(1.12)}.color-option.is-selected{box-shadow:0 0 0 2px var(--surface), 0 0 0 3px var(--ink)}.graph-frame{border:1px solid var(--hairline-strong);background:var(--surface);min-height:500px;box-shadow:inset 0 0 0 4px var(--soft-blue);border-radius:12px;overflow:hidden}.graph-frame:fullscreen{background:var(--surface);border:0;border-radius:0;width:100vw;height:100vh;min-height:0;display:block}.graph-frame:fullscreen .graph-svg{width:100%;height:100%;min-height:0}.graph-svg{cursor:grab;touch-action:none;user-select:none;width:100%;height:auto;min-height:500px;display:block}.graph-svg.is-panning{cursor:grabbing}.graph-svg:focus-visible{outline:3px solid var(--focus);outline-offset:-3px}.graph-grid-minor{stroke:var(--hairline);stroke-width:.7px;opacity:.48}.graph-grid{stroke:var(--hairline-strong);stroke-width:1px;opacity:.72}.graph-axis{stroke:var(--hairline-strong);stroke-width:1.4px}.graph-label{fill:var(--mute);font-family:JetBrains Mono,monospace;font-size:10px}.axis-number{fill:var(--ink);font-family:JetBrains Mono,monospace;font-size:8px}.graph-path{fill:none;stroke:#0070f3;stroke-linecap:round;stroke-linejoin:round;stroke-width:3px}.graph-path.secondary{stroke:#a1a1a1;stroke-dasharray:7 7;stroke-width:2px}.cursor-line{stroke:var(--accent-violet);stroke-dasharray:3 5;stroke-width:1px;opacity:.28}.cursor-point{fill:var(--surface);stroke:var(--accent-pink);stroke-width:1.5px}.cursor-label-bg{fill:var(--ink);opacity:.94}.cursor-label{fill:var(--canvas);font-family:JetBrains Mono,monospace;font-size:11px}.result-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin-top:12px;display:grid}.result-card{border:1px solid var(--hairline);background:var(--surface);border-radius:10px;min-height:76px;padding:12px;box-shadow:0 5px 16px #3569910f}.result-label{color:var(--mute);letter-spacing:.04em;text-transform:uppercase;font-family:JetBrains Mono,monospace;font-size:10px;display:block}.result-value{color:var(--ink);font-variant-numeric:tabular-nums;margin-top:6px;font-size:15px;font-weight:500;display:block}.result-card:first-child .result-value{color:var(--accent-blue)}.result-card:nth-child(2) .result-value{color:var(--accent-violet)}.result-card:nth-child(3) .result-value{color:var(--accent-pink)}.result-card:nth-child(4) .result-value{color:var(--accent-cyan)}.transform-summary{border:1px solid var(--hairline);background:var(--surface-muted);border-radius:10px;grid-template-columns:minmax(0,1.1fr) minmax(190px,.9fr);align-items:start;gap:16px;margin-top:12px;padding:14px;display:grid}.transform-summary .eyebrow{margin-bottom:7px;font-size:10px}.transform-summary-text{color:var(--ink);margin:0;font-size:14px;line-height:1.5}.transform-summary ul{color:var(--body);gap:5px;margin:0;padding:0 0 0 18px;font-size:12px;line-height:1.4;display:grid}.transform-summary li::marker{color:var(--accent-violet)}.tool-note{color:var(--mute);margin:12px 0 0;font-size:12px}.point-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-bottom:14px;display:grid}.point-fieldset{border:1px solid var(--hairline);border-radius:8px;grid-template-columns:28px minmax(0,1fr);gap:8px 6px;min-width:0;margin:0;padding:10px;display:grid}.point-fieldset legend{color:var(--ink);grid-column:1/-1;font-size:12px;font-weight:600}.point-fieldset label{color:var(--body);align-self:center;font-family:JetBrains Mono,monospace;font-size:12px}.point-fieldset input{border:1px solid var(--hairline-strong);min-width:0;min-height:34px;color:var(--ink);background:var(--surface);border-radius:6px;padding:0 7px;font-size:13px}.point-fieldset input:focus{border-color:var(--focus);box-shadow:0 0 0 3px color-mix(in srgb, var(--focus) 18%, transparent);outline:none}.slope-actions{flex-wrap:wrap;gap:6px;margin:-4px 0 20px;display:flex}.slope-formula{margin-bottom:16px}.slope-presets .preset{min-height:40px;font-size:10px}.slope-point{fill:var(--surface);stroke:var(--accent-pink);stroke-width:2.5px}.slope-segment{stroke:var(--accent-violet);stroke-width:1.5px;stroke-dasharray:5 5;opacity:.55}.slope-equation-readout{color:var(--ink);margin:10px 0 0;font-family:JetBrains Mono,monospace;font-size:14px;font-weight:600}.slope-details{grid-template-columns:minmax(0,1.1fr) minmax(220px,.9fr);gap:12px;margin-top:12px;display:grid}.slope-detail-block,.slope-property-block{border:1px solid var(--hairline);background:var(--surface);border-radius:10px;padding:14px}.slope-details .eyebrow{margin-bottom:10px;font-size:10px}.slope-details .step-list{gap:8px}.slope-details .step-list li{grid-template-columns:24px 1fr;gap:8px;font-size:12px}.slope-details .step-list li:before{width:24px;height:24px;font-size:10px}.slope-details .step-list strong,.slope-details .step-list span{grid-column:2;min-width:0;display:block}.slope-details .step-list span{color:var(--mute);margin-top:3px;font-family:JetBrains Mono,monospace;font-size:11px;line-height:1.45}.slope-property-block dl{gap:8px;margin:0;display:grid}.slope-property-block dl div{border-bottom:1px solid var(--hairline-soft);justify-content:space-between;gap:12px;padding-bottom:6px;display:flex}.slope-property-block dt{color:var(--body);font-size:12px}.slope-property-block dd{color:var(--ink);font-variant-numeric:tabular-nums;margin:0;font-family:JetBrains Mono,monospace;font-size:12px}.content-section{border-top:1px solid var(--hairline);padding:64px 0}.intro-section{background:var(--soft-green)}.seo-content{background:linear-gradient(135deg, var(--canvas), var(--soft-purple))}.faq-section{background:var(--soft-peach)}.about-block,.how-to-block{max-width:100%}.how-to-block{border-top:1px solid color-mix(in srgb, var(--accent-green) 22%, var(--hairline));margin-top:44px;padding-top:36px}.content-section h2{color:var(--accent-violet);letter-spacing:-.05em;text-wrap:balance;margin:0 0 16px;font-size:30px;line-height:1.1}.intro-section h2{color:var(--accent-green)}.faq-section h2{color:var(--accent-blue)}.content-section p{max-width:none;color:var(--body);margin:0;line-height:1.75}.reading-column{max-width:none}.content-article{padding-left:22px;position:relative}.content-article:before{background:var(--accent-blue);content:"";border-radius:99px;width:4px;position:absolute;top:4px;bottom:4px;left:0}.content-article:nth-child(4n+2):before{background:var(--accent-green)}.content-article:nth-child(4n+3):before{background:var(--accent-pink)}.content-article:nth-child(4n):before{background:var(--accent-cyan)}.content-article:nth-child(4n+2) h2{color:var(--accent-green)}.content-article:nth-child(4n+3) h2{color:var(--accent-pink)}.content-article:nth-child(4n) h2{color:var(--accent-cyan)}.content-article+.content-article{margin-top:52px}.content-article p+p{margin-top:16px}.internal-links-paragraph{color:var(--body);padding-top:28px;padding-bottom:28px;line-height:1.8}.internal-links-paragraph a{color:var(--accent-blue);text-underline-offset:3px;font-weight:600;text-decoration-thickness:1px}.internal-links-paragraph a:hover,.internal-link-line a:hover{color:var(--accent-violet)}.step-list{counter-reset:steps;gap:12px;margin:0;padding:0;list-style:none;display:grid}.step-list li{color:var(--body);grid-template-columns:30px 1fr;align-items:start;gap:12px;display:grid}.step-list li:before{width:30px;height:30px;color:var(--ink);background:var(--surface-muted);content:counter(steps);counter-increment:steps;border-radius:50%;place-items:center;font-family:JetBrains Mono,monospace;font-size:12px;display:grid}.faq-list{max-width:none;margin:28px 0 0}.faq-list details{border-top:1px solid var(--hairline);padding:18px 0}.faq-list details:last-child{border-bottom:1px solid var(--hairline)}.faq-list summary{cursor:pointer;color:var(--ink);font-weight:500}.faq-list details p{margin-top:12px}.info-content{background:linear-gradient(135deg, var(--canvas), var(--soft-blue))}.info-content .content-article{max-width:100%}.contact-card{border:1px solid var(--hairline-strong);background:var(--surface);border-radius:14px;margin-top:56px;padding:20px 22px;box-shadow:0 10px 26px #1c476c14}.contact-card .eyebrow{margin-bottom:8px}.contact-email{color:var(--accent-blue);text-underline-offset:4px;font-size:18px;font-weight:600}.contact-email:hover{color:var(--accent-violet)}.site-footer{border-top:1px solid var(--hairline);background:var(--soft-purple);padding:32px 0}.footer-shell{justify-content:space-between;align-items:start;gap:24px;display:flex}.footer-copy{max-width:340px;color:var(--mute);margin:12px 0 0;font-size:13px}.footer-links{color:var(--body);flex-wrap:wrap;gap:16px;font-size:13px;display:flex}.footer-links a:hover{color:var(--accent-violet)}.footer-info-bar{border-top:1px solid var(--hairline);align-items:center;gap:14px;margin-top:26px;padding-top:16px;display:flex}.footer-info-label{color:var(--mute);letter-spacing:.06em;text-transform:uppercase;font-family:JetBrains Mono,monospace;font-size:11px}.footer-info-bar nav{color:var(--body);flex-wrap:wrap;gap:14px;font-size:12px;display:flex}.footer-info-bar a:hover{color:var(--accent-violet)}.skip-link{z-index:30;color:var(--canvas);background:var(--ink);border-radius:6px;padding:10px 14px;position:absolute;top:-100px;left:16px}.skip-link:focus{top:16px}.error-page{background:linear-gradient(135deg, var(--soft-blue), var(--soft-purple) 55%, var(--soft-green));place-items:center;min-height:min(680px,100vh - 160px);padding:72px 0 96px;display:grid}.error-page-inner{border:1px solid var(--hairline-strong);background:color-mix(in srgb, var(--surface) 92%, transparent);max-width:760px;box-shadow:var(--shadow);text-align:center;border-radius:24px;justify-items:center;padding:56px 32px 60px;display:grid}.error-status{color:var(--accent-violet);letter-spacing:-.08em;margin-bottom:12px;font-family:JetBrains Mono,monospace;font-size:clamp(56px,10vw,112px);font-weight:500;line-height:.95}.error-page .eyebrow{color:var(--accent-cyan);margin-bottom:14px}.error-page h1{max-width:18ch;color:var(--ink);letter-spacing:-.06em;text-wrap:balance;margin:0;font-size:clamp(30px,5vw,52px);line-height:1.08}.error-message{max-width:620px;color:var(--body);margin:18px 0 28px;font-size:17px;line-height:1.7}.error-home-link{border:1px solid var(--accent-blue);min-height:46px;color:var(--surface);background:var(--accent-blue);border-radius:999px;align-items:center;padding:11px 18px;font-weight:600;text-decoration:none;transition:transform .18s,background .18s,box-shadow .18s;display:inline-flex;box-shadow:0 8px 18px #2479c52e}.error-home-link:hover{background:var(--accent-violet);transform:translateY(-2px);box-shadow:0 10px 22px #805ad538}.scroll-top{z-index:19;border:1px solid var(--hairline-strong);width:44px;height:44px;color:var(--surface);background:var(--accent-blue);border-radius:50%;place-items:center;transition:transform .18s,background .18s,box-shadow .18s;display:grid;position:fixed;bottom:20px;right:20px;box-shadow:0 8px 20px #1c476c2e}.scroll-top:hover{background:var(--accent-violet);transform:translateY(-2px);box-shadow:0 10px 24px #805ad53d}.scroll-top svg{fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:2px;width:20px;height:20px}@media (width<=820px){.site-nav{z-index:30;overscroll-behavior:contain;border:0;border-top:1px solid var(--hairline);background:var(--surface);border-radius:0;flex-direction:column;align-items:stretch;gap:6px;width:100%;height:calc(100dvh - 74px);padding:16px;display:none;position:absolute;top:74px;left:0;right:0;overflow-y:auto;box-shadow:0 16px 34px #1c476c24}.site-nav[data-open=true]{display:flex}.site-nav a,.nav-dropdown-toggle{text-align:left;width:100%}.site-info-links{justify-content:flex-start;gap:14px;overflow-x:auto}.header-actions .language-picker summary{border-radius:10px;justify-content:center}.header-actions .language-menu{border:1px solid var(--accent-cyan);background:var(--surface);border-radius:14px;min-width:160px;margin-top:0;padding:6px;position:absolute;top:calc(100% + 8px);right:0;box-shadow:0 14px 34px #1c476c29}.header-actions .language-menu a{white-space:nowrap;width:auto}.nav-dropdown-menu{width:auto;min-width:0;box-shadow:none;background:0 0;border:0;border-radius:8px;grid-template-columns:1fr;margin-top:4px;padding:0 0 0 8px;position:static}.nav-dropdown-menu a{white-space:normal}.menu-toggle{display:block}.nav-shell{gap:12px;padding:0 16px}.brand-name{font-size:22px}.header-actions .theme-toggle{width:46px;min-width:46px;height:46px;padding:8px;font-size:0}.header-actions .theme-icon{width:18px;height:18px}.hero{padding:24px 20px 30px}.section-heading{display:block}.section-heading p{max-width:720px;margin-top:12px}.tool-shell{grid-template-columns:1fr}.tool-controls{border-right:0;border-bottom:1px solid var(--hairline)}.graph-toolbar{flex-wrap:wrap}.toolbar-actions{justify-content:flex-start;width:100%;margin-left:0}.function-value-inline{margin-left:0}.axis-number{paint-order:stroke;stroke:var(--surface);stroke-width:2.5px;stroke-opacity:.9;font-size:14px;font-weight:700}.hero h1{letter-spacing:-.045em;max-width:24ch;font-size:clamp(28px,5.5vw,42px);line-height:1.14}.hero-intro{max-width:680px;margin-top:10px;font-size:15px;line-height:1.45}.section-heading h2{font-size:clamp(21px,3.6vw,28px)}.content-section h2{font-size:clamp(22px,4.8vw,28px)}.tool-section{padding:22px 0 36px}.tool-controls{padding:10px}.tool-output{padding:6px}.tool-controls .control-group{gap:4px;margin-bottom:10px}.tool-controls .control-group input,.tool-controls .control-group select{min-height:36px}.tool-controls>[data-controls]{grid-template-columns:repeat(2,minmax(0,1fr));align-items:start;gap:8px;display:grid}.tool-controls>[data-controls]>.formula-guide,.tool-controls>[data-controls]>.transform-control-help,.tool-controls>[data-controls]>.transform-presets,.tool-controls>[data-controls]>.custom-mode-note{grid-column:1/-1}.tool-controls>[data-controls] .control-group{min-width:0;margin-bottom:0}.keyboard-toggle{margin-bottom:12px}.preset-grid{overscroll-behavior-inline:contain;scrollbar-color:var(--accent-blue) var(--soft-blue);scrollbar-width:thin;scroll-snap-type:x proximity;grid-template-columns:none;gap:8px;margin:0 -2px;padding:2px 2px 8px;display:flex;overflow-x:auto}.preset{scroll-snap-align:start;flex:0 0 clamp(140px,42vw,190px);min-height:42px;padding:6px 8px;font-size:10px}.preset-type{font-size:9px}.graph-toolbar{display:block}.toolbar-actions{justify-content:flex-start;margin-top:8px;margin-left:0}.graph-frame{aspect-ratio:auto;height:clamp(360px,66vw,500px);min-height:0}.graph-frame .graph-svg{width:100%;height:100%;min-height:0}.how-to-block{margin-top:36px;padding-top:28px}.footer-info-bar{flex-direction:column;align-items:flex-start;gap:8px}.error-page{min-height:calc(100vh - 142px);padding:42px 0 56px}.error-page-inner{padding:42px 22px 46px}.error-message{font-size:15px;line-height:1.6}.scroll-top{width:42px;height:42px;bottom:14px;right:14px}}@media (width>=821px){.hero h1{white-space:normal}}@media (width<=580px){.container{width:min(100% - 32px, var(--max-width))}.hero{text-align:left;padding:10px 16px 12px}.section-heading{display:block}.section-heading p{max-width:none;margin-top:12px}.hero h1{letter-spacing:-.04em;max-width:20ch;font-size:clamp(23px,6vw,28px);line-height:1.06}.hero-intro{margin-top:4px;font-size:12.5px;line-height:1.3}.section-heading h2,.content-section h2{font-size:clamp(21px,6vw,27px)}.tool-section{padding:8px 0 20px}.section-heading{margin-bottom:10px}.tool-controls{padding:5px}.tool-output{padding:1px}.tool-controls .control-group{gap:1px;margin-bottom:5px}.tool-controls .control-group label,.tool-controls .control-group .control-label{font-size:12px}.tool-controls .control-group input,.tool-controls .control-group select{min-height:30px;padding-inline:9px}.keyboard-toggle{min-height:24px;margin-bottom:4px}.keyboard-hide{min-height:26px;padding:3px 7px}.tool-status{min-height:12px;margin-top:5px;font-size:10px}.graph-toolbar{margin-bottom:2px}.graph-action{min-height:28px}.graph-color-bar{gap:5px;margin-bottom:4px}.graph-frame{height:clamp(360px,112vw,460px);min-height:0}.result-grid{grid-template-columns:repeat(2,1fr)}.transform-summary,.slope-details{grid-template-columns:1fr}.footer-shell{display:block}.footer-links{margin-top:20px}}@media (width<=400px){.brand{gap:9px}.brand-logo{border-radius:10px;width:36px;height:36px}.brand-name{text-overflow:ellipsis;white-space:nowrap;max-width:132px;font-size:18px;overflow:hidden}.header-actions{gap:2px}.header-actions .language-picker summary{width:auto;max-width:118px;height:40px;padding:8px 7px;font-size:11px;line-height:1.1}.header-actions .language-name{text-overflow:ellipsis;white-space:nowrap;max-width:72px;overflow:hidden}.header-actions .language-picker .dropdown-chevron{width:6px;height:6px;margin-left:1px}.header-actions .theme-toggle,.menu-toggle{width:40px;min-width:40px;height:40px}}@media (width<=360px){.brand-name{max-width:78px;font-size:17px}.header-actions .language-picker summary{max-width:100px}.header-actions .language-name{max-width:58px}.header-actions .theme-toggle,.menu-toggle{width:36px;min-width:36px;height:36px}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important}}