* { box-sizing: border-box; }
button, input { font: inherit; }
a { color: inherit; }
p, li { overflow-wrap: anywhere; }
:focus-visible { outline: 3px solid var(--kw-accent); outline-offset: 3px; }
h2 { margin: 0; font-size: clamp(1.2rem,2vw,1.48rem); line-height: 1.35; }
h3 { font-size: 1rem; margin: 12px 0; }
.section-kicker { margin: 0 0 5px; color: var(--kw-accent); font-size: .78rem; font-weight: 780; letter-spacing: .08em; }
.tool-shell { display: grid; grid-template-columns: minmax(0,.85fr) minmax(0,1.15fr); border: 1px solid var(--kw-line-strong); background: var(--kw-surface); }
.calculator-panel, .visual-panel { min-width: 0; padding: 24px; }
.calculator-panel { border-right: 1px solid var(--kw-line); }
.visual-panel { background: #f8f8f4; }
fieldset { margin: 17px 0 0; padding: 0; border: 0; }
legend, label { font-weight: 720; }
label { display: block; margin: 12px 0 5px; }
input { width: 100%; min-width: 0; min-height: 44px; padding: 9px 10px; border: 1px solid var(--kw-line-strong); border-radius: 2px; color: var(--kw-ink); background: var(--kw-surface); }
input[type=range] { padding: 0; accent-color: var(--kw-accent); }
input[aria-invalid=true] { border-color: #9b2f2f; }
.form-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 17px; }
.button { min-height: 44px; padding: 9px 15px; border: 1px solid var(--kw-accent); border-radius: 2px; cursor: pointer; font-weight: 750; }
.button-primary { background: var(--kw-accent); color: white; }
.button-secondary { background: transparent; color: var(--kw-accent); }
.form-error { padding: 10px; border: 1px solid #9b2f2f; color: #9b2f2f; background: #fff3f3; }
.result-box { margin-top: 20px; padding: 18px; border: 1px solid var(--kw-line); background: var(--kw-paper); }
.result-box[data-state=ready] { border-color: var(--kw-accent); background: #f3f8f4; }
.result-value { display: block; color: var(--kw-accent); font-size: 2rem; font-weight: 760; }
.result-box p, .result-note { font-size: .84rem; }
.scale-note, figcaption { color: var(--kw-muted); font-size: .79rem; line-height: 1.5; }
figure { margin: 14px 0; border: 1px solid var(--kw-line); background: var(--kw-surface); }
svg { display: block; width: 100%; height: auto; }
svg text { font-size: 18px; fill: var(--kw-ink); }
figcaption { padding: 10px; }
.content-section { margin-top: 28px; padding-top: 26px; border-top: 1px solid var(--kw-line); }
.formula-list { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 10px; margin-top: 15px; }
.formula-list article { padding: 13px; border: 1px solid var(--kw-line); min-width: 0; overflow-wrap: anywhere; }
.formula-list strong, .formula-list span { display: block; }
.formula-list strong { color: var(--kw-accent); }
.formula-list span { font-size: .82rem; margin-top: 6px; }
.example-box { padding: 13px 15px; border-left: 4px solid var(--kw-accent); background: var(--kw-accent-soft); }
@media(max-width:900px) { .tool-shell { grid-template-columns: minmax(0,1fr); } .calculator-panel { border-right: 0; border-bottom: 1px solid var(--kw-line); } }
@media(max-width:620px) { .calculator-panel, .visual-panel { padding: 15px; } .formula-list { grid-template-columns: minmax(0,1fr); } .form-actions { display: grid; } }