/* ==========================================================================
   MOLT LAB ZONE — molt-labzone.com
   Shared stylesheet
   ========================================================================== */

:root{
  /* Warm industrial white / light mineral gray */
  --c-bg:            #f4f2ee;
  --c-bg-alt:        #eae6df;
  --c-surface:       #ffffff;
  --c-surface-2:     #f8f6f2;

  /* Deep graphite typography */
  --c-graphite:      #262421;
  --c-graphite-soft: #55524b;
  --c-graphite-mute: #716d64;

  /* Dark slate */
  --c-slate:         #333a41;
  --c-slate-2:       #232a30;

  /* Oxide / copper / amber accents */
  --c-oxide:         #a84c2a;
  --c-oxide-dark:    #8f3f22;
  --c-copper:        #a3714a;
  --c-amber:         #c68a3f;

  --c-border:        #ddd7cc;
  --c-border-soft:   #e8e3da;

  --shadow-sm: 0 1px 2px rgba(38,36,33,.06), 0 1px 1px rgba(38,36,33,.04);
  --shadow-md: 0 8px 24px rgba(38,36,33,.08), 0 2px 6px rgba(38,36,33,.05);
  --shadow-lg: 0 20px 48px rgba(38,36,33,.14), 0 6px 16px rgba(38,36,33,.08);

  --radius-sm: 3px;
  --radius-md: 6px;
  --radius-lg: 14px;

  --font-head: 'Shippori Mincho', 'Noto Serif JP', serif;
  --font-body: 'Zen Kaku Gothic New', 'Hiragino Kaku Gothic ProN', sans-serif;
  --font-mono: 'Space Grotesk', 'Zen Kaku Gothic New', sans-serif;

  --container: 1180px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--c-bg);
  color:var(--c-graphite);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{ max-width:100%; display:block;height:auto;}
a{ color:inherit; text-decoration:none; }
ul{ margin:0; padding:0; list-style:none; }
h1,h2,h3,h4{
  font-family:var(--font-head);
  color:var(--c-graphite);
  line-height:1.5;
  font-weight:600;
  margin:0 0 .6em;
}
h1{ font-size:clamp(2rem,4.4vw,3.1rem); letter-spacing:.01em; }
h2{ font-size:clamp(1.5rem,2.8vw,2.15rem); }
h3{ font-size:1.28rem; }
p{ margin:0 0 1.1em; color:var(--c-graphite-soft); }
.container{ max-width:var(--container); margin:0 auto; padding:0 28px; }

section{ padding:96px 0; position:relative; }
@media(max-width:768px){ section{ padding:64px 0; } }

/* ---------- Background section variants ---------- */
.bg-alt{ background:var(--c-bg-alt); }
.bg-surface{ background:var(--c-surface); }
.bg-slate{ background:var(--c-slate); color:#e9e6df; }
.bg-slate h2, .bg-slate h3{ color:#f2efe8; }
.bg-slate p{ color:#c7c3ba; }

.eyebrow{
  display:inline-flex; align-items:center; gap:10px;
  font-family:var(--font-mono);
  font-size:.76rem; letter-spacing:.16em; text-transform:uppercase;
  color:var(--c-oxide); font-weight:600; margin-bottom:16px;
}
.eyebrow::before{
  content:""; width:22px; height:1px; background:var(--c-oxide);
}
.bg-slate .eyebrow{ color:var(--c-amber); }
.bg-slate .eyebrow::before{ background:var(--c-amber); }

.section-head{ max-width:720px; margin-bottom:52px; }
.section-head.center{ margin-left:auto; margin-right:auto; text-align:center; }

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:14px 28px; border-radius:var(--radius-sm);
  font-family:var(--font-body); font-size:.94rem; font-weight:700;
  letter-spacing:.02em; cursor:pointer; border:1px solid transparent;
  transition:all .22s ease; white-space:nowrap;
}
.btn-primary{ background:var(--c-oxide); color:#fff8f2; border-color:var(--c-oxide); }
.btn-primary:hover{ background:var(--c-oxide-dark); border-color:var(--c-oxide-dark); transform:translateY(-1px); box-shadow:var(--shadow-md); }
.btn-outline{ background:transparent; color:var(--c-graphite); border-color:var(--c-graphite); }
.btn-outline:hover{ background:var(--c-graphite); color:#fff; }
.bg-slate .btn-outline{ color:#f2efe8; border-color:#6b7178; }
.bg-slate .btn-outline:hover{ background:#f2efe8; color:var(--c-slate); }
.btn-ghost{ background:transparent; color:var(--c-oxide); padding:14px 6px; }
.btn-ghost::after{ content:"→"; margin-left:6px; transition:transform .2s ease; display:inline-block; }
.btn-ghost:hover::after{ transform:translateX(4px); }
.btn-block{ width:100%; min-height:44px; display:inline-flex; align-items:center; justify-content:center; }
.btn-sm{ padding:10px 18px; font-size:.84rem; }

/* ---------- Header ---------- */
.site-header{
  position:sticky; top:0; z-index:500;
  background:rgba(244,242,238,.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--c-border-soft);
  transition:box-shadow .25s ease;
}
.site-header.scrolled{ box-shadow:0 2px 14px rgba(38,36,33,.07); }
.header-inner{
  display:flex; align-items:center; justify-content:space-between;
  height:78px; gap:24px;
}
.brand{ display:flex; align-items:center; gap:12px; flex-shrink:0; }
.brand svg{ width:38px; height:38px; flex-shrink:0; }
.brand-text{
  font-family:var(--font-mono); font-weight:700; font-size:1.06rem;
  letter-spacing:.06em; color:var(--c-graphite); line-height:1.1;
}
.brand-text small{
  display:block; font-family:var(--font-body); font-weight:400;
  font-size:.62rem; letter-spacing:.1em; color:var(--c-graphite-mute); margin-top:2px;
}
.main-nav ul{ display:flex; align-items:center; gap:30px; }
.main-nav a{
  font-size:.9rem; font-weight:500; color:var(--c-graphite-soft);
  position:relative; padding:6px 0; transition:color .2s ease;
}
.main-nav a::after{
  content:""; position:absolute; left:0; bottom:0; height:2px; width:0;
  background:var(--c-oxide); transition:width .25s ease;
}
.main-nav a:hover, .main-nav a.active{ color:var(--c-graphite); }
.main-nav a:hover::after, .main-nav a.active::after{ width:100%; }
.header-actions{ display:flex; align-items:center; gap:18px; }
.nav-toggle{
  display:none; flex-direction:column; justify-content:center; gap:5px;
  width:38px; height:38px; background:none; border:1px solid var(--c-border);
  border-radius:var(--radius-sm); cursor:pointer; padding:0;
}
.nav-toggle span{ display:block; width:16px; height:2px; background:var(--c-graphite); margin:0 auto; transition:.25s; }
.nav-toggle.open span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2){ opacity:0; }
.nav-toggle.open span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }

@media(max-width:960px){
  .main-nav{
    position:fixed; inset:78px 0 0 0; background:var(--c-bg);
    transform:translateX(100%); transition:transform .3s ease; overflow-y:auto;
    border-top:1px solid var(--c-border-soft);
  }
  .main-nav.open{ transform:translateX(0); }
  .main-nav ul{ flex-direction:column; align-items:flex-start; gap:0; padding:12px 28px 40px; }
  .main-nav li{ width:100%; border-bottom:1px solid var(--c-border-soft); }
  .main-nav a{ display:block; padding:16px 0; }
  .header-actions .btn-primary{ display:none; }
  .nav-toggle{ display:flex; }
}

/* ---------- Hero ---------- */
.hero{
  padding:100px 0 90px;
  background:
    radial-gradient(ellipse at 85% 0%, rgba(198,138,63,.12), transparent 55%),
    linear-gradient(180deg, var(--c-bg) 0%, var(--c-bg-alt) 100%);
  position:relative;
  overflow:hidden;
}
.hero::before{
  content:""; position:absolute; inset:0;
  background-image:
    linear-gradient(90deg, rgba(38,36,33,.035) 1px, transparent 1px),
    linear-gradient(0deg, rgba(38,36,33,.035) 1px, transparent 1px);
  background-size:64px 64px;
  mask-image:linear-gradient(180deg, transparent, #000 25%, #000 75%, transparent);
  pointer-events:none;
}
.hero-grid{
  display:grid; grid-template-columns:1.05fr .95fr; gap:56px; align-items:center;
  position:relative; z-index:1;
}
.hero h1{ margin-bottom:26px; }
.hero .lead{ font-size:1.08rem; max-width:520px; margin-bottom:34px; }
.hero-cta{ display:flex; gap:16px; flex-wrap:wrap; }
.hero-media{
  position:relative; border-radius:var(--radius-lg); overflow:hidden;
  box-shadow:var(--shadow-lg); aspect-ratio:4/3.1;
}
.hero-media img{ width:100%; height:100%; object-fit:cover; }
.hero-media::after{
  content:""; position:absolute; inset:0;
  background:linear-gradient(200deg, rgba(176,80,44,.18), transparent 55%);
}
.hero-tag{
  position:absolute; left:20px; bottom:20px; z-index:2;
  background:rgba(38,36,33,.82); color:#f4f2ee; backdrop-filter:blur(4px);
  padding:12px 16px; border-radius:var(--radius-sm);
  font-family:var(--font-mono); font-size:.72rem; letter-spacing:.06em;
  display:flex; gap:10px; align-items:center;
}
.hero-tag span.dot{ width:7px; height:7px; border-radius:50%; background:var(--c-amber); flex-shrink:0; }

.hero-stats{
  display:flex; gap:40px; margin-top:46px; padding-top:34px;
  border-top:1px solid var(--c-border);
  flex-wrap:wrap;
}
.hero-stats div strong{
  display:block; font-family:var(--font-head); font-size:1.7rem; color:var(--c-oxide);
}
.hero-stats div span{ font-size:.82rem; color:var(--c-graphite-mute); }

@media(max-width:900px){
  .hero-grid{ grid-template-columns:1fr; }
  .hero-media{ order:-1; }
}

/* ---------- Breadcrumb / page header (inner pages) ---------- */
.page-hero{
  padding:64px 0 60px;
  background:linear-gradient(180deg, var(--c-bg-alt), var(--c-bg));
  border-bottom:1px solid var(--c-border-soft);
}
.crumb{ font-family:var(--font-mono); font-size:.76rem; letter-spacing:.08em; color:var(--c-graphite-mute); margin-bottom:18px; }
.crumb a{ color:var(--c-copper); }
.crumb a:hover{ text-decoration:underline; }
.page-hero h1{ margin-bottom:16px; max-width:760px; }
.page-hero .lead{ max-width:640px; font-size:1.02rem; }

/* ---------- Cards / grids ---------- */
.grid{ display:grid; gap:28px; }
.grid-2{ grid-template-columns:repeat(2,1fr); }
.grid-3{ grid-template-columns:repeat(3,1fr); }
.grid-4{ grid-template-columns:repeat(4,1fr); }
@media(max-width:960px){ .grid-3,.grid-4{ grid-template-columns:repeat(2,1fr); } }
@media(max-width:640px){ .grid-2,.grid-3,.grid-4{ grid-template-columns:1fr; } }

.card{
  background:var(--c-surface); border:1px solid var(--c-border-soft);
  border-radius:var(--radius-md); padding:34px 30px;
  transition:box-shadow .25s ease, transform .25s ease, border-color .25s ease;
}
.card:hover{ box-shadow:var(--shadow-md); transform:translateY(-3px); border-color:var(--c-border); }
.card .num{
  font-family:var(--font-mono); font-size:.78rem; color:var(--c-oxide);
  letter-spacing:.1em; margin-bottom:14px; display:block;
}
.card h2{ margin-bottom:12px; }
.card p{ margin-bottom:0; font-size:.94rem; }
.card-icon{
  width:46px; height:46px; border-radius:var(--radius-sm);
  background:var(--c-bg-alt); display:flex; align-items:center; justify-content:center;
  margin-bottom:20px;
}
.card-icon svg{ width:24px; height:24px; }

.card-media{
  border-radius:var(--radius-md); overflow:hidden; border:1px solid var(--c-border-soft);
  background:var(--c-surface); box-shadow:var(--shadow-sm);
}
.card-media img{ width:100%; height:220px; object-fit:cover; }
.card-media .card-media-body{ padding:26px 26px 30px; }

/* ---------- Process diagram (stage flow) ---------- */
.flow-diagram{
  display:grid; grid-template-columns:repeat(4,1fr); gap:1px;
  background:var(--c-border); border:1px solid var(--c-border);
  border-radius:var(--radius-md); overflow:hidden; margin-top:20px;
}
.flow-cell{
  background:var(--c-surface); padding:26px 22px; position:relative; min-height:150px;
}
.flow-cell .flow-index{
  font-family:var(--font-mono); font-size:.7rem; color:var(--c-copper); letter-spacing:.1em;
}
.flow-cell h2{ font-family:var(--font-body); font-size:.98rem; font-weight:700; margin:10px 0 8px; color:var(--c-graphite); }
.flow-cell p{ font-size:.84rem; margin:0; }
@media(max-width:900px){ .flow-diagram{ grid-template-columns:repeat(2,1fr); } }
@media(max-width:560px){ .flow-diagram{ grid-template-columns:1fr; } }

.info-loop{
  display:grid; grid-template-columns:repeat(auto-fit,minmax(190px,1fr)); gap:16px; margin:36px 0;
}
.info-node{
  border:1px solid var(--c-border); border-radius:var(--radius-md);
  background:var(--c-surface); padding:20px 20px 22px; text-align:left;
  border-top:3px solid var(--c-oxide);
}
.info-node h3{ font-size:.92rem; font-family:var(--font-body); font-weight:700; margin:0 0 8px; }
.info-node p{ font-size:.82rem; margin:0; }
.info-center{
  margin:8px auto 0; max-width:640px; text-align:center; padding:30px 26px;
  background:var(--c-slate); color:#f2efe8; border-radius:var(--radius-md);
}
.info-center h4{ font-family:var(--font-head); font-size:1.1rem; color:#f2efe8; margin-bottom:8px; }
.info-center p{ color:#c7c3ba; font-size:.86rem; margin:0; }
.flow-arrow-row{ display:flex; justify-content:center; margin:6px 0; color:var(--c-graphite-mute); font-size:1.3rem; }

/* ---------- Timeline (6 stage approach) ---------- */
.timeline{ position:relative; margin-top:20px; }
.timeline::before{
  content:""; position:absolute; left:27px; top:6px; bottom:6px; width:1px; background:var(--c-border);
}
.t-item{ display:grid; grid-template-columns:56px 1fr; gap:24px; padding-bottom:44px; position:relative; }
.t-item:last-child{ padding-bottom:0; }
.t-num{
  width:56px; height:56px; border-radius:50%; background:var(--c-surface);
  border:1px solid var(--c-border); display:flex; align-items:center; justify-content:center;
  font-family:var(--font-mono); font-weight:700; color:var(--c-oxide); z-index:1; font-size:1.05rem;
}
.t-body h3{ margin-bottom:8px; }
.t-body p{ font-size:.94rem; max-width:640px; margin-bottom:0; }

/* ---------- Table ---------- */
.table-wrap{ overflow-x:auto; border:1px solid var(--c-border-soft); border-radius:var(--radius-md); }
table{ width:100%; border-collapse:collapse; min-width:560px; background:var(--c-surface); }
th,td{ text-align:left; padding:16px 20px; font-size:.9rem; border-bottom:1px solid var(--c-border-soft); }
th{ font-family:var(--font-mono); font-size:.74rem; letter-spacing:.08em; text-transform:uppercase; color:var(--c-graphite-mute); background:var(--c-bg-alt); }
tr:last-child td{ border-bottom:none; }

/* ---------- Forms ---------- */
.form-card{
  background:var(--c-surface); border:1px solid var(--c-border-soft); border-radius:var(--radius-lg);
  padding:44px; box-shadow:var(--shadow-sm);
}
.form-row{ display:grid; grid-template-columns:1fr 1fr; gap:20px; margin-bottom:20px; }
@media(max-width:640px){ .form-row{ grid-template-columns:1fr; } }
.field{ margin-bottom:20px; }
.field label{ display:block; font-size:.84rem; font-weight:700; margin-bottom:8px; color:var(--c-graphite); }
.field .req{ color:var(--c-oxide); }
.field input, .field select, .field textarea{
  width:100%; padding:13px 15px; border:1px solid var(--c-border);
  border-radius:var(--radius-sm); background:var(--c-surface-2); font-family:var(--font-body);
  font-size:.94rem; color:var(--c-graphite); transition:border-color .2s ease, background .2s ease;
}
.field input:focus, .field select:focus, .field textarea:focus{
  outline:none; border-color:var(--c-oxide); background:#fff;
}
.field textarea{ resize:vertical; min-height:120px; }
.field-error input, .field-error select, .field-error textarea{ border-color:#b03a2c; background:#fdf3f1; }
.field-error label{ color:#b03a2c; }
.field-check{ display:flex; align-items:flex-start; gap:10px; font-size:.84rem; color:var(--c-graphite-soft); }
.field-check input{ margin-top:3px; width:24px; height:24px; min-width:24px; min-height:24px; }
.form-note{ font-size:.78rem; color:var(--c-graphite-mute); margin-top:6px; }

/* ---------- Toast (non-blocking popup, replaces alert) ---------- */
#toast-stack{
  position:fixed; right:20px; bottom:20px; z-index:2000;
  display:flex; flex-direction:column; gap:12px; align-items:flex-end;
  max-width:360px;
}
.toast{
  background:var(--c-slate-2); color:#f4f2ee; padding:16px 20px;
  border-radius:var(--radius-md); box-shadow:var(--shadow-lg);
  font-size:.88rem; display:flex; gap:12px; align-items:flex-start;
  border-left:3px solid var(--c-amber);
  opacity:0; transform:translateY(12px); transition:all .3s ease;
}
.toast.show{ opacity:1; transform:translateY(0); }
.toast .toast-title{ font-weight:700; margin-bottom:2px; display:block; }
.toast .toast-close{ margin-left:auto; cursor:pointer; opacity:.6; flex-shrink:0; }
.toast .toast-close:hover{ opacity:1; }

/* ---------- Footer ---------- */
.site-footer{ background:var(--c-slate-2); color:#cbc7bd; padding-top:76px; }
.footer-grid{
  display:grid; grid-template-columns:1.5fr 1fr 1fr 1.2fr; gap:40px; padding-bottom:56px;
  border-bottom:1px solid rgba(255,255,255,.09);
}
.footer-brand{ display:flex; flex-direction:column; gap:16px; }
.footer-brand .brand{ display:flex; align-items:center; gap:10px; }
.footer-brand .brand-text{ color:#f2efe8; }
.footer-brand p{ color:#9c988e; font-size:.86rem; max-width:280px; }
.footer-col h3{
  font-family:var(--font-mono); font-size:.76rem; letter-spacing:.1em; text-transform:uppercase;
  color:#9c988e; margin-bottom:18px; font-weight:600;
}
.footer-col ul li{ margin-bottom:12px; }
.footer-col a{ font-size:.88rem; color:#d8d4c9; transition:color .2s ease; display:inline-block; min-height:24px; line-height:24px; }
.footer-col a:hover{ color:var(--c-amber); }
.footer-col address{ font-style:normal; font-size:.88rem; color:#d8d4c9; line-height:1.9; }
.footer-bottom{
  display:flex; justify-content:space-between; align-items:center; padding:26px 0;
  font-size:.78rem; color:#847f74; flex-wrap:wrap; gap:10px;
}
.footer-bottom .fb-links{ display:flex; gap:20px; }
.footer-bottom a:hover{ color:#d8d4c9; }
@media(max-width:900px){ .footer-grid{ grid-template-columns:1fr 1fr; } }
@media(max-width:560px){ .footer-grid{ grid-template-columns:1fr; } }

/* ---------- Misc ---------- */
.tag-row{ display:flex; flex-wrap:wrap; gap:10px; margin-top:18px; }
.tag{
  font-family:var(--font-mono); font-size:.72rem; letter-spacing:.05em; padding:7px 13px;
  border:1px solid var(--c-border); border-radius:20px; color:var(--c-graphite-soft);
}
.split{ display:grid; grid-template-columns:1fr 1fr; gap:60px; align-items:center; }
@media(max-width:860px){ .split{ grid-template-columns:1fr; gap:36px; } }
.split img, .split .card-media{ border-radius:var(--radius-lg); overflow:hidden; box-shadow:var(--shadow-md); }
.split img{ width:100%; height:100%; object-fit:cover; aspect-ratio:5/4; }

.cta-banner{
  background:var(--c-slate); color:#f2efe8; border-radius:var(--radius-lg);
  padding:60px 56px; display:flex; justify-content:space-between; align-items:center; gap:32px;
  flex-wrap:wrap;
  background-image:radial-gradient(circle at 90% 10%, rgba(198,138,63,.18), transparent 60%);
}
.cta-banner h2{ color:#f7f4ed; margin-bottom:10px; }
.cta-banner p{ color:#c7c3ba; margin-bottom:0; max-width:460px; }
.cta-actions{ display:flex; gap:14px; flex-wrap:wrap; }

.quote-block{
  border-left:3px solid var(--c-oxide); padding:6px 0 6px 26px; margin:34px 0;
}
.quote-block p{ font-family:var(--font-head); font-size:1.18rem; color:var(--c-graphite); font-style:normal; }

.faq-item{ border-bottom:1px solid var(--c-border-soft); padding:22px 0; }
.faq-q{ display:flex; justify-content:space-between; align-items:center; cursor:pointer; gap:20px; }
.faq-q h4{ margin:0; font-size:1rem; }
.faq-q .plus{ font-family:var(--font-mono); font-size:1.3rem; color:var(--c-oxide); transition:transform .25s ease; flex-shrink:0; }
.faq-item.open .plus{ transform:rotate(45deg); }
.faq-a{ max-height:0; overflow:hidden; transition:max-height .3s ease; }
.faq-a p{ padding-top:14px; margin-bottom:0; font-size:.92rem; }

.legal h2{ margin-top:2.2em; }
.legal h2:first-of-type{ margin-top:0; }
.legal ol, .legal ul{ padding-left:1.4em; margin:0 0 1.2em; }
.legal li{ margin-bottom:.5em; color:var(--c-graphite-soft); }
.legal ol > li::marker, .legal ul > li::marker{ color:var(--c-oxide); }
.legal p{ font-size:.96rem; }
.legal-meta{ font-size:.82rem; color:var(--c-graphite-mute); margin-bottom:40px; }

.back-to-top{
  position:fixed; right:22px; bottom:22px; width:46px; height:46px; border-radius:50%;
  background:var(--c-graphite); color:#fff; display:flex; align-items:center; justify-content:center;
  cursor:pointer; opacity:0; visibility:hidden; transform:translateY(10px);
  transition:all .25s ease; z-index:400; box-shadow:var(--shadow-md); border:none; font-size:1.1rem;
}
.back-to-top.show{ opacity:1; visibility:visible; transform:translateY(0); }

/* 404 */
.error-hero{
  min-height:72vh; display:flex; align-items:center; text-align:center;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(198,138,63,.14), transparent 60%),
    linear-gradient(180deg, var(--c-bg) 0%, var(--c-bg-alt) 100%);
}
.error-code{
  font-family:var(--font-mono); font-weight:700; font-size:clamp(4rem,14vw,8rem);
  color:var(--c-oxide); line-height:1; margin-bottom:6px; letter-spacing:.02em;
}
.error-hero p.lead{ max-width:520px; margin:0 auto 34px; }
.error-hero .hero-cta{ justify-content:center; }

.fade-up{ opacity:0; transform:translateY(18px); transition:opacity .6s ease, transform .6s ease; }
.fade-up.in{ opacity:1; transform:translateY(0); }

@media (prefers-reduced-motion: reduce){*,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important;scroll-behavior:auto !important}}