/* ============================================================
   NIGHT BIRD CO., LTD. — Design System v6
   Unified tokens + components used across all pages.
   Direction: "Night Signal" — deep ink navy + warm bronze accent,
   alternating dark/paper section rhythm, a constellation motif
   tying "Night Bird" to an ASEAN network instead of generic
   corporate gold-gradient bling.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Sora:wght@500;600;700;800&family=Inter:wght@400;500;600;700;800&display=swap');

:root{
  /* --- ink (dark) --- */
  --ink:        #131b26;
  --ink-2:      #1b2531;
  --ink-3:      #24303f;
  --ink-4:      #2d3a4a;
  --line:       rgba(255,255,255,.09);
  --line-soft:  rgba(255,255,255,.05);
  --text:       #f2efe8;
  --muted:      #9aa7b5;
  --muted-2:    #c3ccd6;

  /* --- paper (light) --- */
  --paper:      #f6f3ea;
  --paper-2:    #efe9da;
  --ink-on-paper:   #171310;
  --muted-on-paper: #6b6558;
  --line-on-paper:  rgba(23,19,16,.12);

  /* --- accent: warm amber-gold (replaces old gradient-gold button) --- */
  --accent:     #dc9f3f;
  --accent-2:   #f1c877;
  --accent-ink: #241505;

  /* --- secondary accent (Nigoori / automotive) --- */
  --signal:     #3fae86;
  --signal-2:   #7fd4b2;

  --shadow: 0 30px 80px rgba(0,0,0,.35);
  --radius: 18px;
  --radius-sm: 12px;
  --max: 1180px;

  /* spacing scale */
  --sp-1:8px; --sp-2:12px; --sp-3:16px; --sp-4:24px; --sp-5:32px;
  --sp-6:48px; --sp-7:64px; --sp-8:84px; --sp-9:128px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ink);
  color:var(--text);
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI","Noto Sans JP","Noto Sans",Arial,sans-serif;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button,input,textarea,select{font:inherit}
ul{margin:0;padding:0;list-style:none}
.container{width:min(var(--max),calc(100% - 40px));margin-inline:auto}

/* ---------- type ---------- */
.eyebrow{
  color:var(--accent-2);text-transform:uppercase;letter-spacing:.16em;
  font-size:.76rem;font-weight:700;margin-bottom:14px;
}
.section--light .eyebrow{color:#8a5a26}
h1,h2,h3{margin:0 0 16px;font-family:"Sora",Inter,"Noto Sans JP","Noto Sans",sans-serif;font-weight:700;letter-spacing:-.02em;line-height:1.12;text-wrap:balance}
h1{font-size:clamp(2.7rem,5.8vw,4.9rem)}
h2{font-size:clamp(1.8rem,3.4vw,2.9rem)}
h3{font-family:Inter,"Noto Sans JP","Noto Sans",sans-serif;font-weight:700;font-size:1.15rem;letter-spacing:-.005em}

/* Japanese headings: CJK glyphs run wider per character than Latin at the
   same font-size, so the EN-tuned clamp() sizes below wrap translated
   phrases into 3-4 lines with awkward single-character orphans. Scale
   headings down specifically for lang="ja" (set by nbApplyLang) rather
   than shrinking the EN/VI (Latin, space-wrapped) sizes. */
html[lang="ja"] h1{font-size:clamp(1.9rem,4.4vw,3.3rem);line-height:1.3}
html[lang="ja"] .page-hero h1{font-size:clamp(1.9rem,4vw,3.1rem);line-height:1.3}
html[lang="ja"] h2{font-size:clamp(1.5rem,2.8vw,2.3rem);line-height:1.35}
p{margin:0 0 18px}
.lede{font-size:1.08rem;line-height:1.8;color:var(--muted-2);max-width:640px}
.section--light .lede{color:#4d473c}
.muted{color:var(--muted)}
.section--light .muted{color:var(--muted-on-paper)}
.accent{color:var(--accent-2)}
.section--light .accent{color:#9a5f22}
.section--light .badge{color:#9a5f22;border-color:var(--line-on-paper)}
.section--light .pill{border-color:var(--line-on-paper);color:var(--ink-on-paper)}
em{font-style:normal;color:var(--accent-2)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  min-height:50px;padding:0 22px;border-radius:10px;border:1px solid transparent;
  font-weight:700;font-size:.94rem;letter-spacing:.005em;
  transition:transform .2s ease,background .2s ease,border-color .2s ease,color .2s ease;
  cursor:pointer;
}
.btn--primary{background:var(--accent);color:var(--accent-ink)}
.btn--primary:hover{background:var(--accent-2);transform:translateY(-2px)}
.btn--ghost{border-color:var(--line);color:var(--text);background:transparent}
.btn--ghost:hover{border-color:var(--accent);color:var(--accent-2)}
.section--light .btn--ghost{border-color:var(--line-on-paper);color:var(--ink-on-paper)}
.section--light .btn--ghost:hover{border-color:var(--accent);color:#9a5f22}
.btn--signal{background:var(--signal);color:#05201a}
.btn--signal:hover{background:var(--signal-2);transform:translateY(-2px)}

/* ---------- header ---------- */
.topbar{position:sticky;top:0;z-index:60;background:rgba(10,15,22,.82);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{height:78px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:.03em;font-size:.98rem}
.brand small{display:block;font-size:.6rem;color:var(--muted);font-weight:600;letter-spacing:.09em;margin-top:2px}
.birdmark{width:38px;height:38px;display:grid;place-items:center;flex:none}
.birdmark img{width:38px;height:38px}
.navlinks{display:flex;align-items:center;gap:30px;font-size:.93rem}
.navlinks a{position:relative;color:var(--muted-2)}
.navlinks a:hover,.navlinks a.active{color:var(--text)}
.navlinks a::after{content:"";position:absolute;left:0;right:0;bottom:-9px;height:2px;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .2s}
.navlinks a:hover::after,.navlinks a.active::after{transform:scaleX(1)}
.actions{display:flex;align-items:center;gap:16px}
.lang{display:flex;gap:8px;font-size:.8rem;color:var(--muted)}
.lang button{border:0;background:none;color:inherit;padding:4px 2px;cursor:pointer;font-weight:600}
.lang button.active{color:var(--accent-2)}
.menu-toggle{display:none;background:none;border:1px solid var(--line);color:var(--text);border-radius:8px;width:42px;height:42px}
@media(max-width:980px){
  .navlinks{display:none;position:absolute;left:20px;right:20px;top:78px;background:var(--ink-2);border:1px solid var(--line);border-radius:14px;padding:18px;flex-direction:column;align-items:flex-start;gap:16px}
  .navlinks.open{display:flex}
  .menu-toggle{display:block}
  .actions .btn{display:none}
}
@media(max-width:640px){.brand small{display:none}.lang{display:none}}

/* ---------- layout building blocks ---------- */
.section{padding:var(--sp-8) 0}
.section--tight{padding:var(--sp-7) 0}
.section--light{background:var(--paper);color:var(--ink-on-paper)}
.section--light h1,.section--light h2{color:var(--ink-on-paper)}
.section--raised{background:var(--ink-2)}
.section--deep{background:var(--ink)}
.hr{border-top:1px solid var(--line)}
.section--light + .section--light{border-top:1px solid var(--line-on-paper)}

.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:64px}
.grid-2.align-start{align-items:start}
.grid-2.align-center{align-items:center}
.photo-frame{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.photo-frame img{width:100%;height:100%;object-fit:cover;aspect-ratio:4/3}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
@media(max-width:980px){.grid-2{grid-template-columns:1fr;gap:36px}.grid-4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.grid-3,.grid-4{grid-template-columns:1fr}}

/* ---------- hero (photo) ---------- */
.hero{position:relative;min-height:640px;display:flex;align-items:flex-end;overflow:hidden;border-bottom:1px solid var(--line);padding:150px 0 70px}
.hero-photo{position:absolute;inset:0;background-size:cover;background-position:center 62%}
.hero-shade{position:absolute;inset:0;
  background:
    linear-gradient(100deg,rgba(6,10,15,.96) 0%,rgba(6,10,15,.88) 34%,rgba(6,10,15,.42) 68%,rgba(6,10,15,.55) 100%),
    linear-gradient(0deg,rgba(6,10,15,.92) 0%,rgba(6,10,15,.15) 42%,transparent 65%);
}
.hero-inner{position:relative;z-index:2}
.hero-copy{max-width:760px}
.hero-copy h1{margin:16px 0 26px}
.hero-lead{font-size:1.1rem;line-height:1.85;color:var(--muted-2);max-width:600px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-top:30px}
.hero-info{display:flex;gap:0;margin-top:52px;border-top:1px solid rgba(255,255,255,.18);flex-wrap:wrap;max-width:760px}
.hero-info div{padding:16px 28px 0 0;margin-right:28px}
.hero-info span{display:block;font-size:.64rem;letter-spacing:.14em;color:var(--accent-2);margin-bottom:6px}
.hero-info strong{font-family:Inter,sans-serif;font-weight:700;font-size:.92rem;color:var(--text)}
@media(max-width:640px){.hero{min-height:560px;padding:150px 0 56px;align-items:flex-start}.hero-photo{background-position:68% center}.hero-info{gap:0}.hero-info div{margin-right:20px;padding-right:20px}}

/* ---------- approach strip ---------- */
.approach{border-bottom:1px solid var(--line);background:var(--ink-2)}
.approach-grid{display:grid;grid-template-columns:repeat(4,1fr)}
.approach-grid > div{padding:26px 28px;border-right:1px solid var(--line);display:flex;align-items:baseline;gap:14px}
.approach-grid > div:first-child{border-left:1px solid var(--line)}
.approach-grid b{font-family:"Sora",sans-serif;color:var(--accent-2);font-size:1.3rem;font-weight:700}
.approach-grid span{font-size:.88rem;color:var(--muted-2)}
@media(max-width:980px){.approach-grid{grid-template-columns:repeat(2,1fr)}.approach-grid>div{border-left:1px solid var(--line) !important}}
@media(max-width:640px){.approach-grid{grid-template-columns:1fr}}

/* ---------- cards (IT Solutions grid) ---------- */
.card-tile{background:var(--ink-2);padding:34px 28px;min-height:230px;display:flex;flex-direction:column}
.card-tile .num{color:var(--accent-2);font-size:.72rem;letter-spacing:.12em;font-weight:700}
.card-tile h3{margin-top:auto;padding-top:34px}
.card-tile p{color:var(--muted);font-size:.92rem;margin-bottom:12px}
.card-tile i{font-style:normal;color:var(--accent-2);font-size:.82rem;font-weight:600;margin-top:auto}
.card-tile{transition:background .2s ease}
.card-tile:hover{background:var(--ink-3)}

/* ---------- product feature panels ---------- */
.feature-panel{padding:56px;border-radius:24px;border:1px solid var(--line);background:var(--ink-2)}
.feature-panel.is-signal{border-color:rgba(63,174,134,.28);background:radial-gradient(circle at 25% 20%,rgba(63,174,134,.14),transparent 45%),var(--ink-2)}
.badge{display:inline-flex;padding:7px 12px;border-radius:999px;border:1px solid var(--line);color:var(--accent-2);font-size:.68rem;font-weight:700;letter-spacing:.08em;margin-bottom:16px}
.is-signal .badge{border-color:rgba(63,174,134,.4);color:var(--signal-2)}
.flow-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:38px;font-size:.72rem;letter-spacing:.1em;color:var(--signal-2)}
.flow-row b{color:var(--signal)}
.report-ui{border:1px solid var(--line);border-radius:20px;padding:26px;background:var(--ink-3)}
.report-top{display:flex;justify-content:space-between;padding-bottom:18px;border-bottom:1px solid var(--line);color:var(--accent-2);font-weight:700;font-size:.85rem}
.report-top small{color:var(--muted);font-weight:500}
.report-row{display:flex;justify-content:space-between;padding:18px 2px;border-bottom:1px solid var(--line-soft);font-size:.82rem}
.report-row b{font-weight:600;color:var(--text)}
.report-row span{color:var(--signal-2)}
.report-highlight{margin-top:18px;padding:22px;border-radius:14px;background:rgba(201,138,70,.09)}
.report-highlight small{display:block;color:var(--accent-2);font-size:.68rem;letter-spacing:.1em;margin-bottom:8px}
.report-highlight strong{font-family:"Sora",sans-serif;font-size:1.3rem;font-weight:700;color:var(--text)}
.nigoori-mark{max-width:260px;margin-bottom:8px}
@media(max-width:640px){.feature-panel{padding:32px 24px}}

/* ---------- pills / tags ---------- */
.pill-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:34px}
.pill{padding:11px 16px;border:1px solid var(--line);border-radius:999px;font-size:.8rem;color:var(--muted-2)}

/* ---------- final cta ---------- */
.cta-band{background:linear-gradient(120deg,var(--ink-2),#182b26);border-top:1px solid var(--line)}
.cta-band .grid-2{align-items:center}

/* ---------- footer ---------- */
.footer{border-top:1px solid var(--line);padding:40px 0 56px;color:var(--muted);font-size:.85rem;background:var(--ink)}
.footer-grid{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;align-items:flex-start}
.footer-links{display:flex;gap:20px;flex-wrap:wrap}
.footer .brand{margin-bottom:10px}
@media(max-width:640px){.footer-grid{flex-direction:column}}

/* ---------- generic page hero (for interior pages) ---------- */
.page-hero{position:relative;overflow:hidden;padding:150px 0 76px;border-bottom:1px solid var(--line);
  background:radial-gradient(ellipse 800px 500px at 85% -10%,rgba(201,138,70,.12),transparent 60%),var(--ink)}
.page-hero h1{font-size:clamp(2.6rem,5.6vw,4.6rem)}
.page-hero .lede{max-width:720px}
.page-hero .container{position:relative;z-index:2}
.page-hero .principle-card{background:rgba(15,22,32,.72);backdrop-filter:blur(10px)}

/* ---------- process steps (reused later) ---------- */
.process{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.process > div{background:var(--ink-2);padding:30px;min-height:220px}
.process b{color:var(--accent-2);font-size:.7rem;letter-spacing:.1em;display:block;margin-bottom:auto}
.process h3{margin-top:40px}
.process p{color:var(--muted);font-size:.88rem}
@media(max-width:900px){.process{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.process{grid-template-columns:1fr}}
.process.cols-7{grid-template-columns:repeat(7,1fr)}
.process.cols-7>div{padding:20px 16px;min-height:150px}
.process.cols-7 h3{font-size:.95rem;margin-top:30px}
@media(max-width:1100px){.process.cols-7{grid-template-columns:repeat(4,1fr)}}
@media(max-width:640px){.process.cols-7{grid-template-columns:repeat(2,1fr)}}

/* ---------- compare (before/after, partnership) ---------- */
.compare-grid{display:grid;grid-template-columns:1fr auto 1fr;gap:24px;align-items:center}
.compare-box{border:1px solid var(--line);border-radius:var(--radius);padding:30px;background:var(--ink-2)}
.compare-box.is-positive{border-color:rgba(63,174,134,.35);background:radial-gradient(circle at 20% 15%,rgba(63,174,134,.1),transparent 45%),var(--ink-2)}
.compare-box small{display:block;color:var(--muted);font-size:.66rem;letter-spacing:.12em;margin-bottom:8px}
.compare-box.is-positive small{color:var(--signal-2)}
.compare-box h3{margin-bottom:16px}
.compare-box ul{display:grid;gap:10px}
.compare-box li{font-size:.88rem;color:var(--muted-2);padding-left:16px;position:relative}
.compare-box li::before{content:"—";position:absolute;left:0;color:var(--accent-2)}
.compare-box.is-positive li::before{color:var(--signal-2)}
.compare-symbol{font-size:1.8rem;color:var(--accent-2);text-align:center}
@media(max-width:900px){.compare-grid{grid-template-columns:1fr}.compare-symbol{transform:rotate(90deg)}}

/* ---------- page-hero two-column variant (hero copy + a side panel) ---------- */
.page-hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:60px;align-items:start}
@media(max-width:980px){.page-hero-grid{grid-template-columns:1fr;gap:36px}}

/* ---------- principle / approach side panel ---------- */
.principle-card{border:1px solid var(--line);border-radius:var(--radius);padding:28px;background:var(--ink-2)}
.principle-card > small{display:block;color:var(--accent-2);letter-spacing:.14em;font-size:.66rem;font-weight:700;margin-bottom:6px}
.principle-card .step{display:flex;gap:16px;padding:16px 0;border-bottom:1px solid var(--line)}
.principle-card .step:last-child{border-bottom:0}
.principle-card .step b{color:var(--accent-2);font-size:.68rem;letter-spacing:.1em;flex:none;padding-top:2px}
.principle-card .step span{font-size:.9rem;color:var(--muted-2)}

/* ---------- service rows (IT Solutions core services) ---------- */
.service-row{display:grid;grid-template-columns:56px 1fr 1fr;gap:32px;padding:32px 0;border-bottom:1px solid var(--line);align-items:start}
.service-row:last-child{border-bottom:0}
.service-row .num{color:var(--accent-2);font-size:.72rem;font-weight:700;letter-spacing:.1em}
.service-row h3{font-size:1.3rem;margin-bottom:8px}
.service-row p{color:var(--muted);font-size:.92rem;margin-bottom:0}
.service-row .pill-row{margin-top:0;gap:8px}
.service-row .pill{padding:8px 13px;font-size:.75rem}
@media(max-width:900px){.service-row{grid-template-columns:1fr;gap:10px}}

/* ---------- case study cards ---------- */
.case-card{border:1px solid var(--line);border-radius:var(--radius);padding:40px;background:var(--ink-2);margin-bottom:20px}
.case-card:last-child{margin-bottom:0}
.case-head{display:flex;gap:24px;align-items:flex-start;flex-wrap:wrap;margin-bottom:28px}
.case-num{font-family:"Sora",sans-serif;font-weight:700;font-size:1.5rem;color:var(--accent-2);flex:none;line-height:1.1}
.case-head-text{flex:1;min-width:240px}
.case-head-text .badge{margin-bottom:10px}
.case-head-text h3{font-size:1.3rem;margin-bottom:8px;color:var(--text)}
.case-head-text p{color:var(--muted);font-size:.92rem;margin-bottom:0}
.case-detail{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;padding-top:28px;border-top:1px solid var(--line)}
.case-detail div small{display:block;color:var(--accent-2);font-size:.66rem;letter-spacing:.12em;font-weight:700;margin-bottom:10px}
.case-detail div p{color:var(--muted-2);font-size:.88rem;margin-bottom:0}
@media(max-width:900px){.case-detail{grid-template-columns:1fr;gap:18px}}
@media(max-width:640px){.case-card{padding:28px 22px}.case-head{gap:14px}}

/* ---------- forms (reused on contact page) ---------- */
.field{margin-bottom:18px}
.field label{display:block;font-size:.82rem;color:var(--muted);margin-bottom:8px}
.field input,.field textarea,.field select{width:100%;border:1px solid var(--line);background:var(--ink-3);color:var(--text);border-radius:10px;padding:14px 15px;outline:none}
.field input:focus,.field textarea:focus{border-color:var(--accent)}
.hp{position:absolute;left:-5000px}

/* ---------- misc ---------- */
.skip{position:absolute;left:-9999px;top:0;background:var(--accent);color:var(--accent-ink);padding:10px 16px;border-radius:8px;z-index:200}
.skip:focus{left:16px;top:16px}