:root{
  --void:#070B14;
  --ink:#0E1524;
  --ink-2:#151D2E;
  --steel:#1A3A5C;
  --live:#2FCB7A;
  --live-dim:rgba(47,203,122,.15);
  --paper:#EEF0F3;
  --snow:#F7F8FA;
  --white:#FFFFFF;
  --text:#0F141C;
  --muted:#556070;
  --faint:#8B94A3;
  --line:#D5DAE2;
  --line-2:#BFC6D1;
  --accent:#184A73;
  --accent-light:#2A6496;
  --display:'Pretendard',-apple-system,BlinkMacSystemFont,'Malgun Gothic',sans-serif;
  --brand:'Fredoka','Pretendard',sans-serif;
  --body:'Pretendard','Noto Sans JP',-apple-system,BlinkMacSystemFont,'Malgun Gothic','Hiragino Sans',sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,monospace;
}

*{box-sizing:border-box;margin:0;}
html{scroll-behavior:smooth;}
body{background:var(--paper);color:var(--text);font-family:var(--body);
  -webkit-font-smoothing:antialiased;line-height:1.75;overflow-x:hidden;}
a{color:inherit;text-decoration:none;}
button{font:inherit;background:none;border:none;cursor:pointer;color:inherit;}
::selection{background:var(--ink);color:#fff;}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;}
.wrap{width:min(1240px,100% - 48px);margin-inline:auto;}
@media (max-width:680px){ .wrap{width:min(1240px,100% - 32px);} }

/* ════════ NAV ════════ */
.nav{position:fixed;inset:0 0 auto;z-index:100;background:rgba(7,11,20,.92);backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(255,255,255,.08);transition:background .3s;}
.nav-in{width:min(1240px,100% - 48px);margin:0 auto;height:68px;
  display:flex;align-items:center;justify-content:space-between;gap:20px;}
.brand{display:flex;align-items:center;gap:10px;color:#fff;}
.brand-mark{width:28px;height:28px;border-radius:7px;overflow:hidden;flex-shrink:0;
  display:block;background:#000;}
.brand-mark img{display:block;width:100%;height:100%;object-fit:cover;}
.brand-name{font-family:var(--brand);font-weight:700;font-size:16px;letter-spacing:.01em;}
.brand-font{font-family:var(--brand);font-weight:700;letter-spacing:.01em;}
.nav-links{display:flex;align-items:center;gap:24px;font-size:13.5px;font-weight:500;}
.nav-links a{color:rgba(255,255,255,.65);transition:color .15s;}
.nav-links a:hover{color:#fff;}
.nav-cta{padding:9px 18px !important;border:1px solid rgba(255,255,255,.3);border-radius:4px;
  color:#fff !important;font-weight:600;transition:background .2s,border-color .2s;}
.nav-cta:hover{background:rgba(255,255,255,.12);border-color:#fff;}

.nav-drop{position:relative;}
.nav-drop-btn{display:inline-flex;align-items:center;gap:4px;cursor:pointer;color:rgba(255,255,255,.65);transition:color .15s;}
.nav-drop-btn:hover{color:#fff;}
.nav-drop-btn::after{content:"▾";font-size:10px;opacity:.6;}
.nav-drop-menu{position:absolute;top:100%;left:-12px;background:rgba(14,21,36,.96);backdrop-filter:blur(20px);
  border:1px solid rgba(255,255,255,.14);border-radius:8px;padding:8px 0;min-width:220px;
  opacity:0;visibility:hidden;transform:translateY(8px);transition:all .2s cubic-bezier(.22,1,.36,1);
  box-shadow:0 18px 40px rgba(0,0,0,.45);z-index:110;display:flex;flex-direction:column;}
.nav-drop:hover .nav-drop-menu, .nav-drop:focus-within .nav-drop-menu{opacity:1;visibility:visible;transform:none;}
.nav-drop-menu a{padding:9px 18px;font-size:13px;color:rgba(255,255,255,.75);display:block;white-space:nowrap;transition:background .15s,color .15s;}
.nav-drop-menu a:hover{background:rgba(255,255,255,.08);color:#fff;}

@media (max-width:900px){
  .nav-links a:not(.nav-cta), .nav-drop{display:none;}
  .nav-in{width:min(1240px,100% - 32px);height:60px;}
}

/* ════════ BREADCRUMBS ════════ */
.breadcrumb{margin-bottom:20px;font-family:var(--mono);font-size:12px;}
.breadcrumb ol{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:8px;align-items:center;}
.breadcrumb li{color:rgba(255,255,255,.45);display:flex;align-items:center;gap:8px;}
.breadcrumb li+li::before{content:"/";color:rgba(255,255,255,.25);}
.breadcrumb a{color:rgba(255,255,255,.7);transition:color .15s;}
.breadcrumb a:hover{color:#fff;}
.breadcrumb [aria-current="page"]{color:var(--live);font-weight:600;}

/* ════════ SUBPAGE HERO ════════ */
.sub-hero{background:var(--void);color:#E6EBF3;padding:140px 0 80px;position:relative;overflow:hidden;}
.sub-hero::before{content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(60% 60% at 80% 20%,rgba(26,58,92,.4),transparent 70%),
             radial-gradient(40% 40% at 10% 90%,rgba(47,203,122,.08),transparent 60%);}
.sub-hero-in{position:relative;z-index:1;max-width:920px;}
.sub-kicker{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12px;
  letter-spacing:.12em;text-transform:uppercase;color:var(--live);background:rgba(47,203,122,.1);
  padding:4px 12px;border-radius:4px;border:1px solid rgba(47,203,122,.25);margin-bottom:18px;}
.sub-kicker .dot{width:6px;height:6px;border-radius:50%;background:var(--live);box-shadow:0 0 8px var(--live);}
.sub-title{font-family:var(--display);font-weight:800;font-size:clamp(32px,4.5vw,52px);line-height:1.2;
  color:#fff;letter-spacing:-.02em;margin-bottom:20px;word-break:keep-all;}
.sub-lead{font-size:clamp(16px,1.8vw,19px);line-height:1.75;color:rgba(230,235,243,.75);margin-bottom:28px;word-break:keep-all;}
.sub-badges{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:36px;}
.sub-badge{font-family:var(--mono);font-size:12px;padding:6px 14px;background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.12);border-radius:4px;color:rgba(255,255,255,.85);}
.sub-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center;}

.btn{display:inline-flex;align-items:center;justify-content:center;padding:14px 28px;
  background:#fff;color:var(--void);font-weight:700;font-size:14.5px;border-radius:4px;
  transition:all .2s;box-shadow:0 8px 24px rgba(0,0,0,.25);}
.btn:hover{background:#f0f2f5;transform:translateY(-1px);}
.btn-line{display:inline-flex;align-items:center;justify-content:center;padding:14px 28px;
  border:1px solid rgba(255,255,255,.3);color:#fff;font-weight:600;font-size:14.5px;border-radius:4px;
  transition:all .2s;}
.btn-line:hover{background:rgba(255,255,255,.08);border-color:#fff;}

/* ════════ SECTIONS ════════ */
.sec{padding:90px 0;border-bottom:1px solid var(--line);}
.sec-head{margin-bottom:48px;max-width:820px;}
.sec-no{font-family:var(--mono);font-size:12px;letter-spacing:.14em;color:var(--accent);margin-bottom:10px;text-transform:uppercase;font-weight:600;}
.sec-title{font-family:var(--display);font-weight:700;font-size:clamp(24px,3vw,34px);color:var(--text);letter-spacing:-.02em;line-height:1.3;margin-bottom:12px;word-break:keep-all;}
.sec-desc{font-size:16px;color:var(--muted);line-height:1.75;word-break:keep-all;}

/* ════════ GRIDS & CARDS ════════ */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
@media (max-width:860px){ .grid-3{grid-template-columns:1fr 1fr;} }
@media (max-width:600px){ .grid-3, .grid-2{grid-template-columns:1fr;} }

.card{background:var(--white);border:1px solid var(--line);border-radius:6px;padding:32px 28px;
  transition:transform .2s,box-shadow .2s,border-color .2s;display:flex;flex-direction:column;}
.card:hover{transform:translateY(-3px);border-color:var(--accent);box-shadow:0 12px 30px rgba(15,20,28,.06);}
.card-num{font-family:var(--mono);font-size:12px;color:var(--accent);letter-spacing:.08em;margin-bottom:12px;font-weight:600;}
.card-title{font-family:var(--display);font-weight:700;font-size:19px;color:var(--text);margin-bottom:12px;word-break:keep-all;}
.card-desc{font-size:14.5px;color:var(--muted);line-height:1.7;word-break:keep-all;}
.card-list{list-style:none;padding:0;margin:16px 0 0;display:flex;flex-direction:column;gap:8px;}
.card-list li{font-size:13.5px;color:var(--muted);display:flex;gap:8px;}
.card-list li::before{content:"•";color:var(--accent);font-weight:bold;}

/* ════════ TECH & ARCHITECTURE ════════ */
.tech-box{background:var(--ink);color:#E6EBF3;border-radius:6px;padding:36px;margin-top:20px;}
.tech-box h3{font-family:var(--display);font-size:20px;font-weight:700;color:#fff;margin-bottom:16px;}
.tech-box p{font-size:15px;color:rgba(230,235,243,.75);line-height:1.75;margin-bottom:24px;}
.tech-tags{display:flex;flex-wrap:wrap;gap:8px;}
.tech-tag{font-family:var(--mono);font-size:12px;padding:5px 12px;background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.15);border-radius:4px;color:#fff;}

/* ════════ CASE / PORTFOLIO HIGHLIGHT ════════ */
.case-card{background:var(--white);border:1px solid var(--line);border-radius:6px;padding:32px;
  display:grid;grid-template-columns:1fr auto;gap:28px;align-items:center;margin-bottom:20px;}
@media (max-width:760px){ .case-card{grid-template-columns:1fr;gap:20px;} }
.case-meta{font-family:var(--mono);font-size:12px;color:var(--live);margin-bottom:8px;font-weight:600;}
.case-name{font-family:var(--display);font-size:22px;font-weight:700;color:var(--text);margin-bottom:10px;}
.case-desc{font-size:14.5px;color:var(--muted);line-height:1.7;margin-bottom:12px;}
.case-tech{font-family:var(--mono);font-size:12px;color:var(--faint);}

/* ════════ STEPS ════════ */
.steps-wrap{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;}
@media (max-width:960px){ .steps-wrap{grid-template-columns:1fr 1fr;gap:20px;} }
@media (max-width:540px){ .steps-wrap{grid-template-columns:1fr;} }
.step-item{background:var(--white);border:1px solid var(--line);border-radius:6px;padding:24px;position:relative;}
.step-num{width:32px;height:32px;border-radius:50%;background:var(--void);color:#fff;
  display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:13px;font-weight:700;margin-bottom:14px;}
.step-title{font-family:var(--display);font-size:16px;font-weight:700;color:var(--text);margin-bottom:8px;}
.step-text{font-size:13.5px;color:var(--muted);line-height:1.6;}

/* ════════ FAQ ════════ */
.faq-list{display:flex;flex-direction:column;gap:12px;}
.faq-item{background:var(--white);border:1px solid var(--line);border-radius:6px;overflow:hidden;}
.faq-q{width:100%;padding:20px 24px;text-align:left;display:flex;justify-content:space-between;align-items:center;gap:16px;font-weight:700;font-size:16px;color:var(--text);}
.faq-q:hover{background:var(--snow);}
.faq-icon{font-family:var(--mono);font-size:18px;color:var(--accent);transition:transform .2s;}
.faq-item.open .faq-icon{transform:rotate(45deg);}
.faq-a{display:none;padding:0 24px 22px;font-size:14.5px;color:var(--muted);line-height:1.75;}
.faq-item.open .faq-a{display:block;}

/* ════════ RELATED LINKS ════════ */
.related-box{background:var(--white);border:1px solid var(--line);border-radius:6px;padding:32px;margin-top:40px;}
.related-box h4{font-family:var(--display);font-size:17px;font-weight:700;margin-bottom:16px;}
.related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;}
.related-grid a{display:block;padding:12px 16px;background:var(--snow);border:1px solid var(--line);border-radius:4px;font-size:13.5px;font-weight:600;color:var(--text);transition:all .15s;}
.related-grid a:hover{background:var(--void);color:#fff;border-color:var(--void);}

/* ════════ CONTACT ════════ */
.sub-contact{background:var(--void);color:#E6EBF3;padding:90px 0;position:relative;}
.sub-contact .wrap{display:grid;grid-template-columns:1.2fr .8fr;gap:48px;align-items:center;}
@media (max-width:760px){ .sub-contact .wrap{grid-template-columns:1fr;gap:36px;} }
.sub-contact h2{font-family:var(--display);font-size:clamp(26px,3.5vw,38px);font-weight:700;color:#fff;margin-bottom:16px;line-height:1.3;}
.sub-contact p{font-size:15.5px;color:rgba(230,235,243,.7);line-height:1.75;}
.contact-tips{margin-top:24px;padding:20px;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:6px;}
.contact-tips h4{font-family:var(--mono);font-size:12px;letter-spacing:.1em;color:var(--live);margin-bottom:10px;text-transform:uppercase;}
.contact-tips ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:8px;}
.contact-tips li{font-size:13.5px;color:rgba(230,235,243,.75);display:flex;gap:8px;line-height:1.6;}
.contact-tips li::before{content:"✓";color:var(--live);font-weight:700;}

/* ════════ FOOTER ════════ */
footer{background:var(--void);border-top:1px solid rgba(255,255,255,.08);padding:40px 0 28px;color:#E6EBF3;}
.ft-nav{width:100%;display:grid;grid-template-columns:repeat(4,1fr);gap:28px;padding-bottom:36px;border-bottom:1px solid rgba(255,255,255,.08);margin-bottom:24px;}
.ft-col h4{font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:rgba(255,255,255,.4);text-transform:uppercase;margin-bottom:14px;}
.ft-col ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:9px;}
.ft-col a{font-size:13px;color:rgba(255,255,255,.6);transition:color .15s;}
.ft-col a:hover{color:#fff;}
@media (max-width:760px){ .ft-nav{grid-template-columns:1fr 1fr;gap:24px;} }
@media (max-width:480px){ .ft-nav{grid-template-columns:1fr;} }
.ft{font-size:12.5px;color:rgba(255,255,255,.4);}
.ft .brand-font{color:rgba(255,255,255,.7);}