*,*::before,*::after{margin:0;padding:0;box-sizing:border-box;}
:root{--ink:#1A1612;--ink-deep:#0F0D0A;--parchment:#F5F0E8;--parchment-warm:#EDE5D8;--copper:#B8703F;--copper-light:#D4945F;--copper-glow:rgba(184,112,63,0.15);--text-body:#4A443E;--text-muted:#8A847E;--text-faint:#B0AAA4;--border:rgba(26,22,18,0.1);--border-strong:rgba(26,22,18,0.2);--font-display:'Noto Serif JP','游明朝',serif;--font-body:'Zen Kaku Gothic New',sans-serif;--font-mono:'Inter',sans-serif;--ease-expo:cubic-bezier(0.16,1,0.3,1);}
html{scroll-behavior:smooth;font-size:16px;overflow-x:hidden;}
body{font-family:var(--font-body);background:var(--parchment);color:var(--text-body);line-height:1.8;}
.nav{position:fixed;top:0;left:0;right:0;z-index:1000;padding:1rem 4vw;display:flex;justify-content:space-between;align-items:center;background:rgba(245,240,232,0.92);backdrop-filter:blur(24px);box-shadow:0 1px 0 var(--border);}
.nav-brand{font-family:var(--font-display);font-size:1.4rem;font-weight:700;letter-spacing:0.12em;color:var(--ink);text-decoration:none;display:flex;align-items:baseline;gap:0.5rem;}
.nav-brand small{font-family:var(--font-body);font-size:0.6rem;font-weight:400;letter-spacing:0.06em;color:var(--text-muted);}
.nav-right{display:flex;align-items:center;gap:1.2rem;}
.nav-cta{padding:0.6rem 1.6rem;background:var(--ink);color:var(--parchment);text-decoration:none;font-size:0.78rem;letter-spacing:0.08em;font-weight:500;}
.nav-cta:hover{background:var(--copper);}
.nav-menu-toggle{display:flex;flex-direction:column;justify-content:center;align-items:center;width:40px;height:40px;background:transparent;border:none;cursor:pointer; touch-action:manipulation; -webkit-tap-highlight-color:transparent; user-select:none;padding:0;gap:5px;}
.nav-menu-toggle span{display:block;width:20px;height:1.5px;background:var(--ink);transition:all 0.35s var(--ease-expo);transform-origin:center;}
.nav-menu-toggle.is-open span:nth-child(1){transform:translateY(6.5px) rotate(45deg);}
.nav-menu-toggle.is-open span:nth-child(2){opacity:0;}
.nav-menu-toggle.is-open span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg);}
.nav-menu-backdrop{position:fixed;inset:0;background:rgba(15,13,10,0.6);backdrop-filter:blur(4px);z-index:1000;opacity:0;visibility:hidden;transition:opacity 0.4s ease,visibility 0.4s ease;}
.nav-menu-backdrop.is-open{opacity:1;visibility:visible;}
.nav-menu-panel{position:fixed;top:0;right:0;bottom:0;width:380px;max-width:92vw;background:var(--parchment);z-index:1001;transform:translateX(100%);transition:transform 0.5s var(--ease-expo);overflow-y:auto;box-shadow:-20px 0 60px rgba(15,13,10,0.2);}
.nav-menu-panel.is-open{transform:translateX(0);}
.nav-menu-header{display:flex;justify-content:space-between;align-items:center;padding:1.4rem 2rem;border-bottom:1px solid var(--border);}
.nav-menu-brand{font-family:var(--font-display);font-size:1.2rem;font-weight:700;letter-spacing:0.1em;color:var(--ink);text-decoration:none;}
.nav-menu-close{width:32px;height:32px;background:transparent;border:none;cursor:pointer;padding:0;position:relative;}
.nav-menu-close::before,.nav-menu-close::after{content:'';position:absolute;left:50%;top:50%;width:18px;height:1.5px;background:var(--ink);transform-origin:center;}
.nav-menu-close::before{transform:translate(-50%,-50%) rotate(45deg);}
.nav-menu-close::after{transform:translate(-50%,-50%) rotate(-45deg);}
.nav-menu-body{padding:1.4rem 0;}
.nav-menu-group{padding:0 2rem;margin-bottom:1.8rem;}
.nav-menu-group-label{font-family:var(--font-mono);font-size:0.65rem;letter-spacing:0.2em;color:var(--copper);text-transform:uppercase;margin-bottom:0.85rem;font-weight:700;display:flex;align-items:center;gap:0.5rem;}
.nav-menu-group-label::before{content:'';width:18px;height:1px;background:var(--copper);}
.nav-menu-link{display:block;font-size:0.92rem;color:var(--text-body);text-decoration:none;padding:0.65rem 0;border-bottom:1px dashed var(--border);font-weight:500;}
.nav-menu-link:hover{color:var(--copper);}
.nav-menu-link small{display:block;font-size:0.68rem;color:var(--text-muted);margin-top:0.15rem;font-weight:400;}
.nav-menu-cta{margin:1rem 2rem 2rem;padding:1rem 1.4rem;background:var(--ink);color:var(--parchment);text-align:center;text-decoration:none;font-size:0.88rem;font-weight:600;display:block;}
.page-hero{padding:9rem 8vw 4rem;background:var(--ink);color:var(--parchment);text-align:center;}
.page-hero .breadcrumb{font-family:var(--font-mono);font-size:0.72rem;letter-spacing:0.12em;color:var(--copper-light);margin-bottom:1.2rem;}
.page-hero .breadcrumb a{color:var(--copper-light);text-decoration:none;}
.page-hero .page-eyebrow{font-family:var(--font-mono);font-size:0.78rem;letter-spacing:0.06em;color:var(--copper-light);margin:0 0 1rem;font-weight:500;line-height:1.6;}
.page-hero h1{font-family:var(--font-display);font-size:clamp(1.8rem,4vw,3rem);font-weight:600;line-height:1.4;margin-bottom:1.4rem;}
.page-hero h1 em{font-style:normal;color:var(--copper-light);}
.page-hero .lead{font-size:0.95rem;line-height:2;max-width:760px;margin:0 auto;color:rgba(245,240,232,0.85);}
.sec{padding:2rem 8vw;max-width:1200px;margin:0 auto;}
/* 他ページと同じ1200pxコンテナ・左寄せ。長文だけ読みやすい行長(約820px)で抑え、構造ブロックは中間幅(約980px)。すべて左アンカー */
.sec-narrow{max-width:1200px;}
.sec h2{max-width:900px;}
.sec p,.sec>ul,.sec>ol{max-width:820px;}
.sec table,.result-card,.design-point,.callout,.faq-item,.takeaways,.related-grid{max-width:980px;}
.sec-label{display:inline-flex;align-items:center;gap:0.6rem;font-family:var(--font-mono);font-size:0.7rem;font-weight:600;letter-spacing:0.18em;color:var(--copper);text-transform:uppercase;margin-bottom:1rem;}
.sec-label::before{content:'';width:32px;height:1px;background:var(--copper);}
.sec h2{font-family:var(--font-display);font-size:clamp(1.5rem,3vw,2.1rem);font-weight:600;color:var(--ink);line-height:1.5;margin-bottom:1.5rem;}
.sec h2 em{font-style:normal;color:var(--copper);}
.sec h3{font-family:var(--font-display);font-size:1.1rem;font-weight:600;color:var(--ink);line-height:1.6;margin:2rem 0 0.8rem;}
.sec p{font-size:0.95rem;line-height:2;color:var(--text-body);margin-bottom:1.2rem;}
.sec p strong{color:var(--ink);font-weight:700;}
.sec ul,.sec ol{margin:0 0 1.4rem 1.4rem;font-size:0.92rem;line-height:2;color:var(--text-body);}
.sec ul li,.sec ol li{margin-bottom:0.4rem;}
.sec table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--border-strong);margin:1.4rem 0;font-size:0.9rem;}
.sec table th,.sec table td{padding:0.95rem 1.2rem;text-align:left;border-bottom:1px solid var(--border);vertical-align:top;line-height:1.7;}
.sec table th{width:34%;background:var(--parchment-warm);font-weight:600;color:var(--ink);font-size:0.85rem;}
.sec table td{color:var(--text-body);}
.sec table tr:last-child th,.sec table tr:last-child td{border-bottom:none;}

.result-card{background:var(--ink);color:var(--parchment);padding:2.2rem 2rem;margin:0 0 2.2rem;border-left:4px solid var(--copper);}
.result-card-label{font-family:var(--font-mono);font-size:0.66rem;letter-spacing:0.18em;color:var(--copper-light);text-transform:uppercase;font-weight:700;margin-bottom:1rem;}
.result-card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1.6rem 2.4rem;}
.result-card-grid > div{border-bottom:1px solid rgba(245,240,232,0.12);padding-bottom:1.2rem;}
.result-card-grid > div:nth-last-child(-n+2){border-bottom:none;padding-bottom:0;}
.result-card-grid dt{font-family:var(--font-mono);font-size:0.7rem;letter-spacing:0.12em;color:rgba(245,240,232,0.65);text-transform:uppercase;margin-bottom:0.45rem;font-weight:500;}
.result-card-grid dd{font-family:var(--font-display);font-size:1.35rem;font-weight:600;line-height:1.4;color:var(--parchment);}
.result-card-grid dd .hl{color:var(--copper-light);}
.result-card-grid dd small{display:block;font-family:var(--font-body);font-size:0.72rem;font-weight:400;color:rgba(245,240,232,0.65);margin-top:0.3rem;letter-spacing:0.04em;}
@media (max-width:640px){.result-card-grid{grid-template-columns:1fr;gap:1.2rem;}.result-card-grid > div{border-bottom:1px solid rgba(245,240,232,0.12)!important;padding-bottom:1rem!important;}.result-card-grid > div:last-child{border-bottom:none!important;padding-bottom:0!important;}}

.callout{background:#fff;border-left:3px solid var(--copper);padding:1.2rem 1.4rem;margin:1.6rem 0;font-size:0.9rem;line-height:2;color:var(--text-body);}
.callout strong{color:var(--ink);}

.note{font-size:0.78rem;color:var(--text-muted);font-style:italic;margin-top:0.5rem;}

.design-point{background:#fff;border:1px solid var(--border);padding:1.6rem 1.8rem;margin:1.2rem 0;}
.design-point h3{margin:0 0 0.6rem;font-size:1.02rem;color:var(--ink);}
.design-point p{font-size:0.9rem;margin-bottom:0.6rem;}
.design-point p:last-child{margin-bottom:0;}

.takeaways{counter-reset:tk;list-style:none;margin:1.6rem 0 0;padding:0;}
.takeaways li{counter-increment:tk;position:relative;padding:1.2rem 0 1.2rem 3.6rem;border-bottom:1px dashed var(--border);font-size:0.95rem;line-height:2;color:var(--text-body);}
.takeaways li::before{content:counter(tk,decimal-leading-zero);position:absolute;left:0;top:1.3rem;font-family:var(--font-mono);font-size:0.85rem;font-weight:700;color:var(--copper);letter-spacing:0.04em;}
.takeaways li:last-child{border-bottom:none;}
.takeaways li strong{color:var(--ink);font-weight:700;}

.case-nav{display:flex;gap:1rem;justify-content:space-between;flex-wrap:wrap;padding:0 8vw;max-width:980px;margin:0 auto 1rem;}
.case-nav a{font-family:var(--font-mono);font-size:0.78rem;letter-spacing:0.08em;color:var(--text-muted);text-decoration:none;}
.case-nav a:hover{color:var(--copper);}

.final-cta{background:var(--ink);color:var(--parchment);padding:5rem 8vw;text-align:center;}
.final-cta h2{font-family:var(--font-display);font-size:clamp(1.5rem,3vw,2.2rem);font-weight:600;line-height:1.4;margin-bottom:1rem;}
.final-cta h2 em{font-style:normal;color:var(--copper-light);}
.final-cta p{font-size:0.9rem;color:rgba(245,240,232,0.8);max-width:560px;margin:0 auto 2rem;}
.final-cta-buttons{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;}
.final-cta-btn{display:inline-flex;align-items:center;gap:0.5rem;padding:1rem 2.2rem;font-size:0.88rem;font-weight:600;text-decoration:none;}
.final-cta-btn.primary{background:var(--copper);color:var(--parchment);}
.final-cta-btn.primary:hover{background:var(--copper-light);}
.final-cta-btn.secondary{background:transparent;color:var(--parchment);border:1px solid var(--parchment);}
.final-cta-btn.secondary:hover{background:var(--parchment);color:var(--ink);}
.site-footer{background:var(--ink-deep);color:var(--text-faint);padding:4rem 6vw 2rem;}
.site-footer-top{max-width:1200px;margin:0 auto 3rem;}.site-footer-grid{max-width:1200px;margin:0 auto;display:grid;grid-template-columns: repeat(5, 1fr);gap:2.5rem;}
.site-footer-brand{font-family:var(--font-display);font-size:1.4rem;font-weight:700;letter-spacing:0.12em;color:var(--parchment);text-decoration:none;}
.site-footer-brand small{display:block;font-family:var(--font-mono);font-size:0.65rem;letter-spacing:0.1em;color:var(--text-faint);margin-top:0.6rem;line-height:1.7;}
.site-footer-col h4{font-family:var(--font-mono);font-size:0.68rem;letter-spacing:0.18em;color:var(--copper-light);text-transform:uppercase;font-weight:700;margin-bottom:1.1rem;}
.site-footer-col ul{list-style:none;padding:0;margin:0;}
.site-footer-col li{margin-bottom:0.6rem;}
.site-footer-col a{color:rgba(245,240,232,0.75);text-decoration:none;font-size:0.82rem;}
.site-footer-col a:hover{color:var(--copper-light);}
.site-footer-bottom{max-width:1200px;margin:3rem auto 0;padding-top:1.8rem;border-top:1px solid rgba(245,240,232,0.1);display:flex;justify-content:space-between;align-items:center;font-size:0.72rem;flex-wrap:wrap;gap:1rem;}
.site-footer-bottom a{color:var(--text-faint);text-decoration:none;margin-left:1.2rem;}
@media (max-width:900px){.site-footer-grid{grid-template-columns:1fr 1fr;gap:2rem;}}
@media (max-width:540px){.site-footer-grid{grid-template-columns:1fr;}}
@media (max-width:720px){.page-hero{padding:7rem 6vw 3rem;}.sec{padding:1.6rem 6vw;}.final-cta{padding:3.5rem 6vw;}.nav-menu-panel{width:100vw;max-width:100vw;}.sec table th{width:38%;font-size:0.78rem;padding:0.7rem 0.9rem;}.sec table td{font-size:0.85rem;padding:0.7rem 0.9rem;}}

.sec.tldr-wrap{padding-top:0;padding-bottom:0;}
.tldr{background:#fff;border:2px solid var(--ink);padding:1.8rem 2rem;margin:-3rem 0 0;max-width:980px;position:relative;z-index:2;box-shadow:0 12px 32px rgba(15,13,10,0.12);}
.tldr-label{font-family:var(--font-mono);font-size:0.66rem;letter-spacing:0.2em;color:var(--copper);text-transform:uppercase;font-weight:700;margin-bottom:0.7rem;}
.tldr h2{font-family:var(--font-display);font-size:1.05rem;font-weight:600;color:var(--ink);margin-bottom:0.9rem;line-height:1.7;}
.tldr ul{list-style:none;margin:0;padding:0;font-size:0.88rem;line-height:1.95;color:var(--text-body);}
.tldr li{padding:0.3rem 0 0.3rem 1.2rem;position:relative;}
.tldr li::before{content:'▸';position:absolute;left:0;color:var(--copper);font-weight:700;}
.tldr li strong{color:var(--ink);font-weight:700;}
@media (max-width:720px){.tldr{margin:-1.5rem 0 0;padding:1.3rem 1.4rem;}.tldr h2{font-size:0.98rem;}.tldr ul{font-size:0.84rem;}}

.faq-item{background:#fff;border:1px solid var(--border);margin-bottom:0.8rem;}
.faq-item summary{padding:1.1rem 1.4rem;cursor:pointer;font-family:var(--font-display);font-weight:600;font-size:0.96rem;color:var(--ink);line-height:1.6;list-style:none;display:flex;justify-content:space-between;align-items:flex-start;gap:1rem;}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{content:'+';font-family:var(--font-mono);color:var(--copper);font-size:1.5rem;font-weight:400;flex-shrink:0;line-height:1;transition:transform 0.3s var(--ease-expo);}
.faq-item[open] summary::after{transform:rotate(45deg);}
.faq-body{padding:0.4rem 1.4rem 1.3rem;font-size:0.9rem;line-height:2;color:var(--text-body);border-top:1px dashed var(--border);margin-top:0.4rem;padding-top:1rem;}
.faq-body strong{color:var(--ink);font-weight:700;}

.related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem;margin-top:1.4rem;}
.related-card{display:block;padding:1.2rem 1.3rem;background:#fff;border:1px solid var(--border);text-decoration:none;color:var(--text-body);transition:border-color 0.2s ease,transform 0.2s ease;}
.related-card:hover{border-color:var(--copper);transform:translateY(-2px);}
.related-card-label{font-family:var(--font-mono);font-size:0.62rem;letter-spacing:0.16em;color:var(--copper);text-transform:uppercase;font-weight:700;margin-bottom:0.45rem;}
.related-card-title{font-family:var(--font-display);font-size:0.96rem;font-weight:600;color:var(--ink);line-height:1.5;margin-bottom:0.35rem;}
.related-card-desc{font-size:0.78rem;line-height:1.75;color:var(--text-muted);}