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var(--color-border);transition:transform .16s,box-shadow .16s}.note-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}.note-card__link{height:100%;padding:var(--space-6);color:inherit;flex-direction:column;text-decoration:none;display:flex}.note-card__meta{font-size:var(--text-xs);color:var(--color-text-muted);font-weight:600}.note-card__title{margin-top:var(--space-3);font-size:var(--text-xl);letter-spacing:-.01em;font-weight:800;line-height:1.18}.note-card__excerpt{margin-top:var(--space-3);color:var(--color-text-muted);font-size:var(--text-sm);flex:1;line-height:1.6}.note-card__cta{margin-top:var(--space-5);font-size:var(--text-sm);color:var(--color-link);font-weight:800}.prose{max-width:var(--container-narrow);font-size:var(--text-lg);color:var(--color-text);line-height:1.75}.prose>p{margin-bottom:var(--space-6)}.prose h2{margin:var(--space-9) 0 var(--space-4);font-size:var(--text-xl);letter-spacing:-.015em}.prose h3{margin:var(--space-7) 0 var(--space-3);font-size:var(--text-lg);font-weight:800}.prose a{color:var(--color-link);text-underline-offset:2px;text-decoration:underline}.prose a:hover{color:var(--color-accent-hover)}.prose ul,.prose ol{margin:0 0 var(--space-6);padding:0;list-style:none}.prose li{margin-bottom:var(--space-3);padding-left:22px;position:relative}.prose ul li:before{content:"";background:var(--color-accent);width:7px;height:7px;position:absolute;top:.62em;left:0}.prose ol{counter-reset:item}.prose ol li{counter-increment:item}.prose ol li:before{content:counter(item);color:var(--color-link);font-size:.85em;font-weight:800;position:absolute;top:.05em;left:0}.prose blockquote{margin:var(--space-6) 0;padding-left:var(--space-5);border-left:4px solid var(--color-rule);color:var(--color-text-muted)}.todo-note{background:var(--color-warn-soft);border-left:4px solid var(--color-warn-rule);padding:var(--space-4) var(--space-5);margin:0 0 var(--space-6);font-size:var(--text-sm);color:var(--color-text);line-height:1.6}.todo-note strong,.todo-note b{color:var(--color-warn);font-weight:800}.page-head{padding-block:var(--space-7) 0}.page-head__eyebrow{margin-top:var(--space-5);font-size:var(--text-xs);letter-spacing:.16em;text-transform:uppercase;color:var(--color-link);font-weight:800}.page-head__title{margin-top:var(--space-2);letter-spacing:-.03em;font-size:clamp(2.25rem,5vw,3.25rem);line-height:1.03}.page-head__lead{margin-top:var(--space-4);max-width:40rem;color:var(--color-text-muted);font-size:var(--text-lg);line-height:1.6}.breadcrumb{font-size:var(--text-xs);color:var(--color-text-muted)}.breadcrumb a{color:var(--color-text-muted);text-decoration:none}.breadcrumb a:hover{color:var(--color-text)}.detail-layout{gap:var(--space-9);padding-block:var(--space-8) var(--space-10);grid-template-columns:1fr 320px;align-items:start;display:grid}.detail-aside{top:calc(var(--space-6) + 64px);border:2px solid var(--color-rule);background:var(--color-surface);position:sticky}.detail-aside dl{padding:var(--space-5);margin:0}.detail-aside dt{font-size:var(--text-xs);letter-spacing:.12em;text-transform:uppercase;color:var(--color-text-muted);font-weight:800}.detail-aside dd{margin:var(--space-1) 0 var(--space-5);font-size:var(--text-sm);font-weight:600}.detail-aside dd:last-child{margin-bottom:0}.tag-list{gap:var(--space-2);margin-top:var(--space-2);flex-wrap:wrap;display:flex}.tag-list li,.tag-list .tag{font-size:var(--text-xs);background:var(--color-surface-2);border:1px solid var(--color-border);padding:4px 10px;font-weight:600;list-style:none}.screenshot{margin:0 0 var(--space-8);border:1px solid var(--color-border);background:var(--color-surface)}.screenshot img{filter:grayscale()contrast(1.05);width:100%}.screenshot figcaption{padding:var(--space-3) var(--space-4);border-top:1px solid var(--color-border);font-size:var(--text-xs);color:var(--color-text-muted)}.article-meta{font-size:var(--text-sm);color:var(--color-text-muted);padding-bottom:var(--space-6);border-bottom:2px solid var(--color-rule);margin-bottom:var(--space-7)}.site-footer{border-top:2px solid var(--color-rule);background:var(--color-surface)}.site-footer__grid{max-width:var(--container-max);padding:var(--space-10) var(--space-7) var(--space-8);gap:var(--space-8);grid-template-columns:1.4fr 1fr 1fr 1.2fr;margin-inline:auto;display:grid}.site-footer__blurb{margin-top:var(--space-4);max-width:15rem;color:var(--color-text-muted);font-size:var(--text-sm);line-height:1.6}.site-footer__heading{font-size:var(--text-xs);letter-spacing:.12em;text-transform:uppercase;color:var(--color-text-muted);margin-bottom:var(--space-4);font-weight:800}.site-footer__col a{font-size:var(--text-sm);color:var(--color-text);margin-bottom:var(--space-3);line-height:1.4;text-decoration:none;display:block}.site-footer__col a:hover{color:var(--color-accent-hover)}.site-footer__bar{border-top:1px solid var(--color-border);font-size:var(--text-sm);color:var(--color-text-muted)}.site-footer__bar .container,.site-footer__bar>div{justify-content:space-between;align-items:center;gap:var(--space-4);padding-block:var(--space-5);display:flex}.site-footer__bar a{color:var(--color-link);font-weight:600;text-decoration:none}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.001ms!important;animation-duration:.001ms!important;animation-iteration-count:1!important}.tool-card:hover,.note-card:hover{transform:none}}@media (max-width:900px){.detail-layout{gap:var(--space-7);grid-template-columns:1fr}.detail-aside{position:static;top:auto}.site-footer__grid{row-gap:var(--space-7);grid-template-columns:1fr 1fr}}@media (max-width:640px){.container{padding-inline:var(--space-5)}.site-header__inner{padding:var(--space-4) var(--space-5)}.section{padding-block:var(--space-8)}.hero{padding-block:var(--space-8) var(--space-7)}.site-footer__grid{grid-template-columns:1fr}.site-footer__bar .container,.site-footer__bar>div{align-items:flex-start;gap:var(--space-2);flex-direction:column}.site-nav{gap:var(--space-5);font-size:var(--text-xs);flex-wrap:wrap}}.km-toggle{border:2px solid var(--color-rule);color:var(--color-text);font-family:var(--font-mono);font-weight:600;font-size:var(--text-xs);letter-spacing:.04em;cursor:pointer;background:0 0;align-items:center;gap:6px;padding:7px 11px;display:inline-flex}.km-toggle:hover{background:var(--color-surface-2)}.km-hamburger{border:2px solid var(--color-rule);cursor:pointer;background:0 0;flex:none;justify-content:center;align-items:center;width:40px;height:40px;display:none}.km-hamburger span{background:var(--color-text);width:18px;height:2px;display:block;position:relative}.km-hamburger span:before,.km-hamburger span:after{content:"";background:var(--color-text);width:18px;height:2px;position:absolute;left:0}.km-hamburger span:before{top:-6px}.km-hamburger span:after{top:6px}.km-navsheet{border-bottom:2px solid var(--color-rule);background:var(--color-surface);display:none}.km-navsheet a{padding:var(--space-4) var(--space-7);border-top:1px solid var(--color-border);color:var(--color-text);font-weight:600;text-decoration:none;display:block}.km-navsheet a:hover{background:var(--color-surface-2)}.km-secnum{font-family:var(--font-mono);font-weight:700;font-size:var(--text-sm);color:var(--color-link);letter-spacing:.05em;margin-bottom:var(--space-2);display:inline-block}.km-pill{font-family:var(--font-mono);font-weight:600;font-size:var(--text-xs);letter-spacing:.04em;border:2px solid var(--color-rule);color:var(--color-text);align-items:center;gap:8px;padding:6px 12px;display:inline-flex}.km-pill--accent{border-color:var(--color-accent);color:var(--color-link)}.km-topbar{justify-content:space-between;align-items:center;gap:var(--space-4);padding-bottom:var(--space-4);border-bottom:2px solid var(--color-rule);margin-bottom:var(--space-6);display:flex}.km-levelsize{font-family:var(--font-mono);font-weight:600;font-size:var(--text-sm);letter-spacing:.03em;border:2px solid var(--color-rule);padding:7px 13px}.km-points{background:var(--color-accent);color:var(--color-accent-contrast);font-family:var(--font-mono);font-weight:600;font-size:var(--text-xs);letter-spacing:.06em;text-transform:uppercase;align-items:baseline;gap:8px;padding:7px 14px;display:inline-flex}.km-points__num{font-size:var(--text-lg);font-variant-numeric:tabular-nums;letter-spacing:0;font-weight:700}.km-board{grid-template-columns:repeat(var(--km-cols,5), minmax(0, 1fr));gap:6px;display:grid}.km-board--dense{gap:3px}.km-box{aspect-ratio:1;border:2px solid var(--color-border);background:var(--color-surface);min-width:0;color:var(--color-text);cursor:pointer;justify-content:center;align-items:center;transition:transform .12s,box-shadow .12s,border-color .12s;display:flex;position:relative}.km-board--dense .km-box{border-width:1px}.km-box:hover{border-color:var(--color-rule);box-shadow:var(--shadow-sm);transform:translateY(-2px)}.km-box:active{transform:translateY(0)}.km-box:after{content:"";background:var(--color-border);opacity:.9;width:5px;height:5px}.km-box .km-glyph{width:46%;height:46%;display:none}.km-box.is-correct,.km-box.is-wrong{cursor:default}.km-box.is-correct:after,.km-box.is-wrong:after{display:none}.km-box.is-correct .km-glyph,.km-box.is-wrong .km-glyph{display:block}.km-box.is-correct{background:var(--color-correct);border-color:var(--color-correct);color:var(--color-correct-contrast)}.km-box.is-wrong{background:var(--color-wrong);border-color:var(--color-wrong);color:var(--color-wrong-contrast);cursor:pointer}.km-box.is-wrong:hover{box-shadow:var(--shadow-sm);transform:translateY(-2px)}.km-glyph{stroke:currentColor;stroke-width:3px;fill:none;stroke-linecap:square}.km-hint{margin-top:var(--space-5);font-size:var(--text-sm);color:var(--color-text-muted)}.km-hint code{font-family:var(--font-mono);color:var(--color-text)}.km-boardstate{border:2px solid var(--color-rule);background:var(--color-surface);padding:var(--space-9);text-align:left}.km-boardstate p{color:var(--color-text-muted);margin-top:var(--space-2)}.km-backdrop{z-index:80;background:var(--color-text);position:fixed;inset:0}@supports (color:color-mix(in lab, red, red)){.km-backdrop{background:color-mix(in srgb, var(--color-text) 52%, transparent)}}.km-backdrop{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);padding:var(--space-5);justify-content:center;align-items:center;display:flex}.km-modal{background:var(--color-surface);border:2px solid var(--color-rule);width:100%;max-width:460px;box-shadow:var(--shadow)}.km-modal__head{padding:var(--space-4) var(--space-5);border-bottom:2px solid var(--color-rule);justify-content:space-between;align-items:center;display:flex}.km-modal__eyebrow{font-family:var(--font-mono);font-size:var(--text-xs);letter-spacing:.08em;text-transform:uppercase;color:var(--color-text-muted);font-weight:600}.km-modal__close{border:2px solid var(--color-rule);color:var(--color-text);cursor:pointer;width:34px;height:34px;font-size:var(--text-lg);background:0 0;justify-content:center;align-items:center;line-height:1;display:flex}.km-modal__close:hover{background:var(--color-surface-2)}.km-kanji{font-family:var(--font-jp);font-feature-settings:normal;color:var(--color-text);padding:var(--space-7) var(--space-5) var(--space-5);font-size:clamp(4.5rem,16vw,7rem);font-weight:600;line-height:1}.km-kanji--loading{color:var(--color-border);background:repeating-linear-gradient(-45deg, transparent 0 8px, var(--color-surface-2) 8px 16px)}.km-choices{gap:var(--space-2);padding:0 var(--space-5) var(--space-5);flex-direction:column;display:flex}.km-choice{align-items:center;gap:var(--space-4);border:2px solid var(--color-border);background:var(--color-surface);width:100%;color:var(--color-text);padding:var(--space-3) var(--space-4);font-family:var(--font-sans);font-weight:600;font-size:var(--text-base);text-align:left;cursor:pointer;transition:border-color .12s,background .12s;display:flex}.km-choice:hover{border-color:var(--color-rule);background:var(--color-surface-2)}.km-choice__num{border:2px solid var(--color-rule);width:30px;height:30px;font-family:var(--font-mono);font-weight:700;font-size:var(--text-sm);flex:none;justify-content:center;align-items:center;display:flex}.km-choice__label{flex:1}.km-choice__mark{flex:none;width:22px;height:22px;display:none}.km-choice.is-correct,.km-choice.is-wrong{cursor:default}.km-choice.is-correct{border-color:var(--color-correct);background:var(--color-correct-soft);color:var(--color-correct-text)}.km-choice.is-correct .km-choice__num{border-color:var(--color-correct);background:var(--color-correct);color:var(--color-correct-contrast)}.km-choice.is-wrong{border-color:var(--color-wrong);background:var(--color-wrong-soft);color:var(--color-wrong-text)}.km-choice.is-wrong .km-choice__num{border-color:var(--color-wrong);background:var(--color-wrong);color:var(--color-wrong-contrast)}.km-choice.is-correct .km-choice__mark,.km-choice.is-wrong .km-choice__mark{display:block}.km-choice.is-dim{opacity:.45}.km-choice .km-glyph{display:block}.km-banner{align-items:center;gap:var(--space-3);padding:var(--space-4) var(--space-5);font-weight:800;font-size:var(--text-base);border-bottom:2px solid;display:flex}.km-banner__icon{flex:none;width:22px;height:22px}.km-banner--correct{background:var(--color-correct-soft);color:var(--color-correct-text);border-color:var(--color-correct)}.km-banner--wrong{background:var(--color-wrong-soft);color:var(--color-wrong-text);border-color:var(--color-wrong)}.km-banner__answer{font-weight:600;font-size:var(--text-sm);margin-top:2px;display:block}.km-modal__foot{justify-content:space-between;align-items:center;gap:var(--space-4);padding:var(--space-5);border-top:2px solid var(--color-rule);display:flex}.km-modal__hint{font-family:var(--font-mono);font-size:var(--text-xs);color:var(--color-text-muted);letter-spacing:.03em}.km-tier{align-items:center;gap:var(--space-2);display:inline-flex}.km-tier__star{flex:none;width:28px;height:28px}.km-tier__name{font-weight:700;font-size:var(--text-sm);letter-spacing:-.01em}.km-tier--lg .km-tier__star{width:64px;height:64px}.km-tier--lg .km-tier__name{font-size:var(--text-xl)}.km-legend-row{background:linear-gradient(90deg, var(--tier-legend-a), var(--tier-legend-b) 60%, var(--color-surface))}@supports (color:color-mix(in lab, red, red)){.km-legend-row{background:linear-gradient(90deg, color-mix(in srgb, var(--tier-legend-a) 22%, var(--color-surface)), color-mix(in srgb, var(--tier-legend-b) 12%, var(--color-surface)) 60%, var(--color-surface))}}.km-legend-row{border-left:4px solid var(--tier-legend-a)}.km-stat{border:2px solid var(--color-rule);background:var(--color-surface);padding:var(--space-6)}.km-stat__num{align-items:center;gap:var(--space-3);font-family:var(--font-mono);font-weight:700;font-size:var(--text-3xl);font-variant-numeric:tabular-nums;line-height:1;display:flex}.km-stat__num svg{width:28px;height:28px}.km-stat--correct .km-stat__num{color:var(--color-correct-text)}.km-stat--wrong .km-stat__num{color:var(--color-wrong-text)}.km-stat__cap{margin-top:var(--space-3);font-size:var(--text-sm);color:var(--color-text-muted);font-weight:600}.km-countup{font-family:var(--font-mono);font-variant-numeric:tabular-nums;min-width:5ch;font-size:clamp(3rem,9vw,5rem);font-weight:700;line-height:1;display:inline-block}.km-mascot{display:block}.km-brand-lockup{align-items:center;gap:var(--space-3);color:var(--color-text);text-decoration:none;display:inline-flex}.km-brand-lockup .km-wordmark{letter-spacing:-.02em;font-size:1.25rem;font-weight:800}@media (max-width:760px){.km-hamburger{display:flex}}@keyframes legendPulse{0%,to{filter:drop-shadow(0 0 3px color-mix(in srgb, var(--tier-legend-a) 55%, transparent))}50%{filter:drop-shadow(0 0 9px color-mix(in srgb, var(--tier-legend-a) 90%, transparent))}}.km-legend-star{animation:2.6s ease-in-out infinite legendPulse}@media (prefers-reduced-motion:reduce){.km-legend-star{animation:none}}.km-consent{z-index:60;background:var(--color-surface);border-top:2px solid var(--color-rule);position:fixed;bottom:0;left:0;right:0}.km-consent__inner{max-width:var(--container-max);padding:var(--space-4) var(--space-7);align-items:center;gap:var(--space-5);flex-wrap:wrap;margin-inline:auto;display:flex}.km-consent p{font-size:var(--text-sm);color:var(--color-text-muted);flex:1;min-width:240px;margin:0}.km-consent a{color:var(--color-link);font-weight:600}.km-consent__actions{gap:var(--space-3);display:flex}.km-adslot{border:1px dashed var(--color-border);background:var(--color-surface-2);justify-content:center;align-items:center;min-height:120px;display:flex}.km-adslot span{font-family:var(--font-mono);font-size:var(--text-xs);letter-spacing:.12em;text-transform:uppercase;color:var(--color-text-muted)}.km-sr-only{clip:rect(0 0 0 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.km-field{margin-bottom:var(--space-5)}.km-label{font-weight:600;font-size:var(--text-sm);margin-bottom:var(--space-2);display:block}.km-input{width:100%;font-family:var(--font-sans);font-size:var(--text-base);border:2px solid var(--color-border);background:var(--color-surface);color:var(--color-text);padding:12px 14px}.km-input::placeholder{color:var(--color-text-muted)}.km-input:hover{border-color:var(--color-text-muted)}.km-input:focus{border-color:var(--color-focus);box-shadow:0 0 0 2px var(--color-focus);outline:none}.km-input--mono{font-family:var(--font-mono);text-transform:uppercase;letter-spacing:.25em}.km-check{gap:var(--space-3);cursor:pointer;font-size:var(--text-sm);align-items:flex-start;line-height:1.5;display:flex}.km-check input{width:20px;height:20px;accent-color:var(--color-accent);flex:none;margin-top:2px}.km-code{font-family:var(--font-mono);font-size:var(--text-2xl);letter-spacing:.2em;padding:var(--space-5);border:2px solid var(--color-rule);background:var(--color-surface-2);word-break:break-all;font-weight:700}.km-warnbox{border-left:4px solid var(--color-warn-rule);background:var(--color-warn-soft);color:var(--color-text);padding:var(--space-4) var(--space-5);font-size:var(--text-sm)}.km-warnbox strong{color:var(--color-warn)}.km-card{border:2px solid var(--color-rule);background:var(--color-surface);padding:var(--space-6)}.km-card--elevated{border-color:var(--color-border);box-shadow:var(--shadow)}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-ordinal{syntax:"*";inherits:false}@property --tw-slashed-zero{syntax:"*";inherits:false}@property --tw-numeric-figure{syntax:"*";inherits:false}@property --tw-numeric-spacing{syntax:"*";inherits:false}@property --tw-numeric-fraction{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}