:root{--sumi-900:#1a1a18;--sumi-800:#2d2d2a;--sumi-700:#3d3d38;--sumi-600:#52524c;--sumi-500:#6b6b64;--sumi-400:#8a8a82;--sumi-300:#adadaa;--sumi-200:#d4d4d0;--sumi-100:#ececea;--sumi-50:#f5f5f3;--hakuji:#f8f7f4;--hakuji-warm:#faf9f6;--hakuji-cool:#f5f5f3;--kin-light:#c9a96e;--kin:#a08040;--kin-deep:#7a6030;--ai-light:#4a7a9e;--ai:#2c5a7a;--ai-deep:#1b3a5c;--shu-light:#d4644a;--shu:#c14b2a;--shu-deep:#963a20;--sui-light:#5e9e7a;--sui:#3d7a5a;--sui-deep:#2a5c40;--color-bg:var(--hakuji);--color-bg-secondary:var(--hakuji-cool);--color-bg-elevated:var(--hakuji-warm);--color-text:var(--sumi-800);--color-text-secondary:var(--sumi-500);--color-text-tertiary:var(--sumi-400);--color-border:var(--sumi-200);--color-border-subtle:var(--sumi-100);--color-accent:var(--kin);--color-accent-hover:var(--kin-light);--color-accent-active:var(--kin-deep);--color-link:var(--ai);--color-error:var(--shu);--color-success:var(--sui);--font-display:"Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;--font-body:"Zen Kaku Gothic New", "Hiragino Sans", "Yu Gothic", system-ui, -apple-system, sans-serif;--font-wordmark:"GenJyuuGothic", "Inter", system-ui, -apple-system, sans-serif;--font-mono:"GenJyuuGothic Mono", "SF Mono", "Menlo", "Fira Code", monospace;--text-display-lg:3rem;--text-display:2.25rem;--text-h1:1.75rem;--text-h2:1.375rem;--text-h3:1.125rem;--text-body-lg:1.0625rem;--text-body:.9375rem;--text-body-sm:.8125rem;--text-caption:.6875rem;--weight-light:300;--weight-regular:400;--weight-medium:500;--tracking-tight:.01em;--tracking-normal:.02em;--tracking-wide:.05em;--tracking-wider:.08em;--tracking-widest:.15em;--leading-tight:1.2;--leading-snug:1.4;--leading-normal:1.6;--leading-relaxed:1.8;--leading-loose:2;--space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;--space-5:1.5rem;--space-6:2rem;--space-8:3rem;--space-10:4rem;--space-12:6rem;--space-16:8rem;--space-24:12rem;--space-32:16rem;--content-max:960px;--content-narrow:640px;--content-wide:1200px;--logo-mark-color:#b8943e;--logo-mark-stroke:var(--sumi-900);--logo-mark-dot:var(--kin);--logo-mark-ray-width:2.5px;--logo-mark-ray-dot:5.5px;--logo-mark-min-size:32px;--logo-detonation-bg:var(--sumi-900);--logo-detonation-arc:var(--kin-light);--logo-detonation-dot:var(--kin-light);--logo-detonation-ray:var(--kin);--logo-detonation-ray-tip:var(--kin-deep);--logo-detonation-glow:#c9a96e26;--logo-detonation-min-size:200px;--ray-angle-ratio:1.61803;--ray-count:48;--ray-width-core:2px;--ray-width-tip:.5px;--sumi-wash-light:var(--sumi-800);--sumi-wash-dark:var(--sumi-700);--particle-color:var(--kin-light);--particle-size-min:1px;--particle-size-max:3px;--radius-none:0;--radius-sm:2px;--radius-md:4px;--radius-full:9999px;--border-thin:1px;--border-regular:1.5px;--duration-fast:.15s;--duration-normal:.25s;--duration-slow:.4s;--ease-default:cubic-bezier(.25, .1, .25, 1);--ease-in:cubic-bezier(.4, 0, 1, 1);--ease-out:cubic-bezier(0, 0, .2, 1);--transition-color:color var(--duration-normal) var(--ease-default), background-color var(--duration-normal) var(--ease-default), border-color var(--duration-normal) var(--ease-default);--transition-opacity:opacity var(--duration-normal) var(--ease-default);--transition-transform:transform var(--duration-normal) var(--ease-out);--shadow-none:none;--shadow-subtle:0 1px 2px #1a1a180a;--shadow-sm:0 2px 8px #1a1a180f;--z-base:0;--z-elevated:10;--z-sticky:100;--z-overlay:200;--z-modal:300;--z-toast:400}.dark,[data-theme=dark]{--color-bg:var(--sumi-900);--color-bg-secondary:var(--sumi-800);--color-bg-elevated:var(--sumi-800);--color-text:var(--sumi-100);--color-text-secondary:var(--sumi-400);--color-text-tertiary:var(--sumi-500);--color-border:var(--sumi-700);--color-border-subtle:var(--sumi-800);--color-accent:var(--kin-light);--color-accent-hover:var(--kin);--color-accent-active:var(--kin-deep);--color-link:var(--ai-light);--color-error:var(--shu-light);--color-success:var(--sui-light)}@font-face{font-family:Shippori Mincho;font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/shippori-mincho-400-0.woff2)format("woff2");unicode-range:U+20,U+30-39,U+41,U+43,U+49,U+4E,U+3001-3002,U+300C-300D,U+3042,U+3044,U+3046,U+3048,U+304A,U+304C,U+304F,U+3052,U+3057,U+3059,U+305B,U+305F-3061,U+3064,U+3066-3068,U+306A-306B,U+306D-306F,U+3073,U+307F,U+3082,U+3084,U+308A-308D,U+308F,U+3092,U+30AD,U+30AF,U+30B5,U+30B9,U+30C0,U+30C3,U+30C8,U+30D3,U+30D7,U+30DC,U+30ED,U+30FB-30FC,U+4E00,U+4E07,U+4E8B,U+4EBA,U+4ED5,U+4F1A,U+4F38,U+4F9B,U+5177,U+5229,U+5408,U+554F,U+5831,U+5834,U+596A,U+5C31,U+5DEE,U+5E74,U+5E83,U+5EA6,U+5FC5,U+6075,U+60C5,U+624B,U+62C5,U+6301,U+63A8,U+65B0,U+65B9,U+6642,U+672A,U+6750,U+6765,U+696D,U+69CB,U+6D3B,U+6E08,U+73FE,U+7523,U+7528,U+754C,U+76F8,U+7701,U+77E5,U+793E,U+79C1,U+7A4D,U+7B49,U+7D4C,U+7D66,U+8003,U+81EA,U+8981,U+898B,U+8A08,U+8AC7,U+8DB3,U+8EAB,U+9020,U+9053,U+91CD,U+9593,U+9700,U+9A13,U+FF1F}@font-face{font-family:Zen Kaku Gothic New;font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/zen-kaku-gothic-new-400-0.woff2)format("woff2");unicode-range:U+20,U+30-39,U+41,U+43,U+49,U+4E,U+3001-3002,U+300C-300D,U+3042,U+3044,U+3046,U+3048,U+304A,U+304C,U+304F,U+3052,U+3057,U+3059,U+305B,U+305F-3061,U+3064,U+3066-3068,U+306A-306B,U+306D-306F,U+3073,U+307F,U+3082,U+3084,U+308A-308D,U+308F,U+3092,U+30AD,U+30AF,U+30B5,U+30B9,U+30C0,U+30C3,U+30C8,U+30D3,U+30D7,U+30DC,U+30ED,U+30FB-30FC,U+4E00,U+4E07,U+4E8B,U+4EBA,U+4ED5,U+4F1A,U+4F38,U+4F9B,U+5177,U+5229,U+5408,U+554F,U+5831,U+5834,U+596A,U+5C31,U+5DEE,U+5E74,U+5E83,U+5EA6,U+5FC5,U+6075,U+60C5,U+624B,U+62C5,U+6301,U+63A8,U+65B0,U+65B9,U+6642,U+672A,U+6750,U+6765,U+696D,U+69CB,U+6D3B,U+6E08,U+73FE,U+7523,U+7528,U+754C,U+76F8,U+7701,U+77E5,U+793E,U+79C1,U+7A4D,U+7B49,U+7D4C,U+7D66,U+8003,U+81EA,U+8981,U+898B,U+8A08,U+8AC7,U+8DB3,U+8EAB,U+9020,U+9053,U+91CD,U+9593,U+9700,U+9A13,U+FF1F}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--hakuji);color:var(--sumi-800);font-family:var(--font-body);letter-spacing:.02em;margin:0;font-weight:400;line-height:1.8}a{color:inherit}img,svg{max-width:100%;display:block}button,a{-webkit-tap-highlight-color:transparent}:focus-visible{outline:2px solid var(--kin-deep);outline-offset:4px}[hidden]{display:none!important}.is-resting,.is-resting *,.is-resting :before,.is-resting :after{animation-play-state:paused!important}.nw{white-space:nowrap}.visually-hidden{clip:rect(0 0 0 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.chapter{padding-block:clamp(104px,15vh,184px);position:relative}.chapter-inner{padding-left:clamp(24px,6vw,146px);padding-right:clamp(24px,6vw,120px)}.ch-heading{max-width:18em;font-family:var(--font-display);letter-spacing:.05em;color:var(--sumi-900);word-break:auto-phrase;margin:0;font-size:clamp(28px,3.1vw,52px);font-weight:400;line-height:1.45}.ch-body{max-width:34em;color:var(--sumi-700);letter-spacing:.03em;word-break:auto-phrase;margin-top:clamp(28px,4vh,44px);font-size:clamp(15px,1.05vw,17px);line-height:2}.ch-body p{margin:0}.ch-body p+p{margin-top:1.1em}.ch-rule{background:var(--kin);width:72px;height:1px;display:block}.ch-note{color:var(--sumi-500);letter-spacing:.03em;font-size:11px;line-height:1.7}.ch-cta{background:var(--kin);min-height:47px;color:var(--sumi-900);letter-spacing:.08em;white-space:nowrap;justify-content:center;align-items:center;padding:0 26px;font-size:13px;text-decoration:none;display:inline-flex}.ch-cta:hover,.ch-cta:focus-visible{text-underline-offset:4px;text-decoration:underline}.ch-cta:active{background:var(--sumi-900);color:var(--hakuji)}.ch-link{color:var(--sumi-900);letter-spacing:.06em;border-bottom:1px solid var(--sumi-400);padding-bottom:3px;font-size:13px;text-decoration:none}.ch-link:hover,.ch-link:focus-visible{border-color:var(--kin);color:var(--kin-deep)}.ch-hairline{border:0;border-top:1px solid var(--sumi-200);margin:0}@media (width<=430px){.chapter{padding-block:88px}.chapter-inner{padding-inline:25px}}.site-head[data-astro-cid-fzpbxy5g]{letter-spacing:normal;z-index:40;border-bottom:1px solid var(--sumi-100);background:#f8f7f4f0;justify-content:space-between;align-items:center;height:80px;padding:0 clamp(24px,5vw,88px);line-height:normal;display:flex;position:fixed;top:0;left:0;right:0}.brand[data-astro-cid-fzpbxy5g]{color:var(--sumi-900);letter-spacing:.19em;white-space:nowrap;align-items:center;gap:7px;font-size:17px;line-height:1;text-decoration:none;display:inline-flex}.brand[data-astro-cid-fzpbxy5g] svg{flex:none;width:44px;height:44px}.nav[data-astro-cid-fzpbxy5g]{letter-spacing:.06em;align-items:center;gap:clamp(20px,2.4vw,40px);font-size:12px;display:flex}.nav[data-astro-cid-fzpbxy5g] a[data-astro-cid-fzpbxy5g]{color:var(--sumi-800);white-space:nowrap;text-decoration:none}.nav[data-astro-cid-fzpbxy5g] a[data-astro-cid-fzpbxy5g]:hover,.nav[data-astro-cid-fzpbxy5g] a[data-astro-cid-fzpbxy5g]:focus-visible{color:var(--kin)}.nav[data-astro-cid-fzpbxy5g] .nav-contact[data-astro-cid-fzpbxy5g]{background:var(--hakuji);color:var(--sumi-900);border:1px solid var(--sumi-400);padding:11px 19px}.nav[data-astro-cid-fzpbxy5g] .nav-contact[data-astro-cid-fzpbxy5g]:hover,.nav[data-astro-cid-fzpbxy5g] .nav-contact[data-astro-cid-fzpbxy5g]:focus-visible{border-color:var(--kin);color:var(--sumi-900)}.head-sentinel[data-astro-cid-fzpbxy5g]{pointer-events:none;width:1px;height:120px;position:absolute;top:0;left:0}.site-head[data-astro-cid-fzpbxy5g].over-hero:not(.is-scrolled){background:0 0;border-bottom-color:#0000;height:96px}.site-head[data-astro-cid-fzpbxy5g].over-hero:not(.is-scrolled) .brand[data-astro-cid-fzpbxy5g] svg{width:48px;height:48px}.site-head[data-astro-cid-fzpbxy5g].over-hero:not(.is-scrolled) .nav[data-astro-cid-fzpbxy5g]{margin-right:calc(43.3vw - clamp(24px,5vw,88px))}.site-head[data-astro-cid-fzpbxy5g].over-hero:not(.is-scrolled) .nav-contact[data-astro-cid-fzpbxy5g]{position:absolute;top:50%;right:clamp(24px,5vw,88px);transform:translateY(-50%)}@media (width<=900px) and (width>=431px){.site-head[data-astro-cid-fzpbxy5g]{padding-inline:30px}.nav[data-astro-cid-fzpbxy5g]{gap:15px;font-size:10px}.site-head[data-astro-cid-fzpbxy5g].over-hero:not(.is-scrolled) .nav[data-astro-cid-fzpbxy5g]{margin-right:calc(43.3vw - 30px)}.site-head[data-astro-cid-fzpbxy5g].over-hero:not(.is-scrolled) .nav-contact[data-astro-cid-fzpbxy5g]{right:30px}}@media (width<=719px){.nav[data-astro-cid-fzpbxy5g] a[data-astro-cid-fzpbxy5g]:not(.nav-contact){display:none}.nav[data-astro-cid-fzpbxy5g]{margin-right:0!important}}@media (width<=430px){.site-head[data-astro-cid-fzpbxy5g],.site-head[data-astro-cid-fzpbxy5g].over-hero:not(.is-scrolled){background:#f8f7f4f5;height:66px;padding:0 22px}.brand[data-astro-cid-fzpbxy5g]{font-size:14px}.brand[data-astro-cid-fzpbxy5g] svg,.site-head[data-astro-cid-fzpbxy5g].over-hero:not(.is-scrolled) .brand[data-astro-cid-fzpbxy5g] svg{width:39px;height:39px}.nav[data-astro-cid-fzpbxy5g] .nav-contact[data-astro-cid-fzpbxy5g],.site-head[data-astro-cid-fzpbxy5g].over-hero:not(.is-scrolled) .nav-contact[data-astro-cid-fzpbxy5g]{color:var(--sumi-800);padding:8px 11px;font-size:10px;position:static;transform:none}}.site-foot[data-astro-cid-nns7i3if]{border-top:1px solid var(--sumi-100);color:var(--sumi-500);grid-template-columns:auto 1fr auto;align-items:center;gap:24px 48px;padding:56px clamp(24px,5vw,88px);font-size:12px;display:grid}.foot-brand[data-astro-cid-nns7i3if]{color:var(--sumi-900);letter-spacing:.19em;align-items:center;gap:6px;display:inline-flex}.foot-brand[data-astro-cid-nns7i3if] svg{width:36px;height:36px}.foot-nav[data-astro-cid-nns7i3if]{flex-wrap:wrap;gap:12px 28px;display:flex}.foot-nav[data-astro-cid-nns7i3if] a[data-astro-cid-nns7i3if]{color:var(--sumi-600);text-decoration:none}.foot-nav[data-astro-cid-nns7i3if] a[data-astro-cid-nns7i3if]:hover,.foot-nav[data-astro-cid-nns7i3if] a[data-astro-cid-nns7i3if]:focus-visible{color:var(--kin)}@media (width<=720px){.site-foot[data-astro-cid-nns7i3if]{grid-template-columns:1fr}}.koi-stack{isolation:isolate;perspective:900px;position:relative}.koi-stack:before,.koi-stack:after{content:"";border:1px solid var(--sumi-100);background:var(--hakuji);pointer-events:none;border-radius:2px;transition:translate .42s cubic-bezier(.22,1,.36,1),rotate .42s cubic-bezier(.22,1,.36,1);position:absolute;inset:0}.koi-stack:before{z-index:-1;translate:8px 9px;rotate:1.2deg}.koi-stack:after{z-index:-2;opacity:.65;translate:16px 18px;rotate:2.4deg}.koi-face{isolation:isolate;background:var(--hakuji-warm);transform-style:preserve-3d;border-radius:2px;padding:clamp(16px,2vw,26px) clamp(18px,2.2vw,30px);transition:transform .42s cubic-bezier(.22,1,.36,1);position:relative;box-shadow:0 22px 34px -28px #1a1a1852}.koi-face:after{content:"";z-index:1;border-radius:inherit;pointer-events:none;background:linear-gradient(145deg, var(--sumi-300), var(--sumi-100) 42%, var(--sumi-200) 72%, var(--sumi-400));-webkit-mask-composite:xor;padding:1px;position:absolute;inset:0;-webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);-webkit-mask-composite:xor,source-over;mask:linear-gradient(#fff 0 0) content-box exclude,linear-gradient(#fff 0 0)}.koi-face:before{content:"";z-index:-1;aspect-ratio:1;pointer-events:none;background:conic-gradient(from 30deg, transparent 0 15%, #1a1a180f 22%, #1a1a1838 31%, transparent 44% 66%, #1a1a181f 76%, transparent 88%);border-radius:50%;width:118%;max-width:250px;position:absolute;top:50%;right:-6%;translate:0 -50%;-webkit-mask:radial-gradient(farthest-side,#0000 calc(100% - 1.5px),#000 calc(100% - .75px));mask:radial-gradient(farthest-side,#0000 calc(100% - 1.5px),#000 calc(100% - .75px))}.koi-host:hover .koi-stack:before,.koi-host:focus-within .koi-stack:before{translate:13px 14px;rotate:2.2deg}.koi-host:hover .koi-stack:after,.koi-host:focus-within .koi-stack:after{translate:25px 27px;rotate:4.4deg}.koi-host:hover .koi-face,.koi-host:focus-within .koi-face{transform:rotateX(2deg)rotateY(-3deg)}@media (prefers-reduced-motion:no-preference){.koi-face:before{animation:36s linear infinite koi-turn}}@media (prefers-reduced-motion:reduce){.koi-stack:before,.koi-stack:after,.koi-face{transition:none}.koi-host:hover .koi-face,.koi-host:focus-within .koi-face{transform:none}}@keyframes koi-turn{to{rotate:360deg}}.koi-frame{isolation:isolate;padding:clamp(18px,2.4vw,30px) clamp(18px,2.4vw,32px);position:relative}.koi-frame:before{content:"";z-index:-1;border:1px solid var(--sumi-100);background:var(--hakuji-warm);pointer-events:none;border-radius:2px;transition:translate .42s cubic-bezier(.22,1,.36,1);position:absolute;inset:0;translate:8px 9px}.koi-frame:after{content:"";pointer-events:none;background:linear-gradient(145deg, var(--sumi-300), var(--sumi-100) 42%, var(--sumi-200) 72%, var(--sumi-400));-webkit-mask-composite:xor;border-radius:2px;padding:1px;position:absolute;inset:0;-webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);-webkit-mask-composite:xor,source-over;mask:linear-gradient(#fff 0 0) content-box exclude,linear-gradient(#fff 0 0)}.koi-frame:hover:before,.koi-frame:focus-within:before{translate:13px 14px}@media (prefers-reduced-motion:reduce){.koi-frame:before{transition:none}}@media (width<=700px){.koi-face:before{width:70%;right:-2%}}