/* ======================================================
   GB商事合同会社 — Brand & Layout System
   Signature: 印鑑 (hanko seal) motif — a mark of trust,
   transparency and official assurance, echoed in the
   company's own language of 透明・安全・安心
   ====================================================== */

:root {
  --ink: #16283A;
  --indigo: #0B84BE;
  --indigo-deep: #06496B;
  --paper: #F5FAFC;
  --paper-alt: #E8F4FA;
  --card: #FFFFFF;
  --seal: #FF7A45;
  --seal-deep: #E8622E;
  --brass: #0894C7;
  --stone: #55677A;
  --stone-light: #7C93A6;
  --line: #D6E8F0;
  --line-deep: #B9DCEA;

  --font-display: "Noto Serif TC", "Noto Serif JP", serif;
  --font-body: "Noto Sans TC", "Noto Sans JP", -apple-system, sans-serif;

  --max: 1140px;
  --radius: 2px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.85;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--ink);
  line-height: 1.4;
  margin: 0 0 0.6em;
  font-weight: 700;
  letter-spacing: 0.02em;
}

p { margin: 0 0 1em; color: var(--stone); }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px;
}

/* Skip link / focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--seal);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* ---------- Language toggle ---------- */
[data-ja] { display: none; }
html[lang="ja"] [data-zh] { display: none; }
html[lang="ja"] [data-ja] { display: inline; }

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--line-deep);
  border-radius: 999px;
  padding: 3px;
  gap: 2px;
  background: var(--paper);
}
.lang-switch button {
  font-family: var(--font-body);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  border: none;
  background: transparent;
  padding: 6px 14px;
  border-radius: 999px;
  cursor: pointer;
  color: var(--stone);
}
.lang-switch button.active {
  background: var(--ink);
  color: #fff;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(245, 250, 252, 0.94);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
  gap: 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand svg, .brand img { width: 42px; height: 42px; flex-shrink: 0; }
.brand-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--ink);
  line-height: 1.3;
}
.brand-text small {
  display: block;
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--stone-light);
  margin-top: 2px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 34px;
}
.main-nav ul {
  list-style: none;
  display: flex;
  gap: 30px;
  margin: 0;
  padding: 0;
}
.main-nav a {
  font-size: 14.5px;
  letter-spacing: 0.03em;
  color: var(--ink);
  position: relative;
  padding: 4px 0;
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -3px;
  width: 0; height: 1px;
  background: var(--seal);
  transition: width 0.25s ease;
}
.main-nav a:hover::after,
.main-nav a[aria-current="page"]::after { width: 100%; }
.main-nav a[aria-current="page"] { color: var(--seal); }

.nav-toggle {
  display: none;
  border: 1px solid var(--line-deep);
  background: var(--paper);
  width: 42px; height: 42px;
  border-radius: 50%;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: "";
  display: block;
  width: 18px; height: 1.5px;
  background: var(--ink);
  position: relative;
}
.nav-toggle span::before { position: absolute; top: -6px; }
.nav-toggle span::after { position: absolute; top: 6px; }

@media (max-width: 880px) {
  .main-nav ul { display: none; }
  .nav-toggle { display: flex; }
  .site-header.open .main-nav ul {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: fixed;
    top: 84px; left: 0; right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 8px 28px 20px;
  }
  .site-header.open .main-nav ul li { border-bottom: 1px solid var(--line); }
  .site-header.open .main-nav ul a { display: block; padding: 14px 0; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 30px;
  font-size: 14.5px;
  letter-spacing: 0.05em;
  border-radius: 999px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}
.btn-primary { background: var(--seal); color: #fff; }
.btn-primary:hover { background: var(--seal-deep); transform: translateY(-1px); }
.btn-outline { border-color: var(--ink); color: var(--ink); }
.btn-outline:hover { background: var(--ink); color: #fff; }
.btn-ghost { border-color: var(--line-deep); color: var(--ink); background: #fff; }
.btn-ghost:hover { border-color: var(--seal); color: var(--seal); }
.btn-block { width: 100%; justify-content: center; }
.btn svg { width: 16px; height: 16px; }

/* ---------- Eyebrow / section labels ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--seal);
  font-weight: 700;
  margin-bottom: 16px;
}
.eyebrow::before {
  content: "";
  width: 22px; height: 1px;
  background: var(--brass);
}

/* ---------- Hero (home) ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, var(--indigo) 0%, var(--indigo-deep) 100%);
  color: #fff;
}
.hero .wrap {
  position: relative;
  z-index: 2;
  padding-top: 96px;
  padding-bottom: 64px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}
.hero-skyline {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  width: 100%; height: auto;
  opacity: 0.9;
  z-index: 1;
}
.hero h1 {
  color: #fff;
  font-size: clamp(30px, 4.4vw, 46px);
  margin-bottom: 22px;
}
.hero h1 em {
  font-style: normal;
  color: #FFC9A0;
}
.hero p.lead {
  color: #DCEFF7;
  font-size: 16.5px;
  max-width: 46ch;
  margin-bottom: 30px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-seal { justify-self: end; }
.hero-seal-ring {
  width: 210px; height: 210px;
  border-radius: 50%;
  border: 1px solid rgba(255, 201, 160, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.hero-seal-ring::before {
  content: "";
  position: absolute;
  inset: 14px;
  border-radius: 50%;
  border: 1px solid rgba(255, 201, 160, 0.3);
}
.hero-seal-ring img { width: 46%; height: auto; filter: drop-shadow(0 4px 14px rgba(0,0,0,0.35)); }

@media (max-width: 880px) {
  .hero .wrap { grid-template-columns: 1fr; padding-top: 56px; }
  .hero-seal { justify-self: center; order: -1; }
  .hero-seal-ring { width: 140px; height: 140px; }
}

/* ---------- Page hero (inner pages) ---------- */
.page-hero {
  background: linear-gradient(180deg, var(--indigo) 0%, var(--indigo-deep) 100%);
  color: #fff;
  padding: 62px 0 46px;
}
.page-hero .eyebrow { color: #FFC9A0; }
.page-hero h1 { color: #fff; font-size: clamp(26px, 3.6vw, 36px); margin-bottom: 10px; }
.page-hero p { color: #DCEFF7; max-width: 60ch; margin: 0; }
.breadcrumb {
  font-size: 12.5px;
  color: #BFE0EF;
  letter-spacing: 0.03em;
  margin-bottom: 18px;
}
.breadcrumb a { color: #DCEFF7; }
.breadcrumb a:hover { color: var(--brass); }

/* ---------- Sections ---------- */
section { padding: 78px 0; }
section.alt { background: var(--paper-alt); }
.section-head { max-width: 640px; margin-bottom: 44px; }
.section-head h2 { font-size: clamp(22px, 2.8vw, 30px); }
.hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 0;
}

/* ---------- Stat / value row ---------- */
.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.value-item {
  background: var(--card);
  padding: 36px 30px;
}
.value-item .mark {
  width: 34px; height: 34px;
  margin-bottom: 18px;
}
.value-item h3 { font-size: 17px; margin-bottom: 10px; }
.value-item p { font-size: 14.5px; margin: 0; }
@media (max-width: 780px) {
  .value-grid { grid-template-columns: 1fr; }
}

/* ---------- Card grid (property categories / platforms) ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 940px) { .card-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 620px) { .card-grid { grid-template-columns: 1fr; } }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.card .tag {
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--brass);
  font-weight: 700;
}
.card h3 { font-size: 18px; margin-bottom: 2px; }
.card p { font-size: 14px; flex-grow: 1; }
.card-links { display: flex; flex-direction: column; gap: 8px; margin-top: 6px; }
.card-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 14px;
  padding: 12px 16px;
  border: 1px solid var(--line-deep);
  transition: border-color 0.2s ease, background 0.2s ease;
}
.card-links a:hover { border-color: var(--seal); background: #EAF7FD; }
.card-links a span.arrow { color: var(--seal); }

/* ---------- Platform strip ---------- */
.platform-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
@media (max-width: 780px) { .platform-strip { grid-template-columns: 1fr; } }
.platform-card {
  background: var(--indigo);
  color: #fff;
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.platform-card .plat-name { font-family: var(--font-display); font-size: 20px; }
.platform-card p { color: #CFE9F5; font-size: 13.5px; margin: 0 0 8px; }
.platform-card a.btn { align-self: flex-start; }

/* ---------- Process / steps ---------- */
.steps { counter-reset: step; }
.step {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 22px;
  padding: 26px 0;
  border-top: 1px solid var(--line);
}
.step:last-child { border-bottom: 1px solid var(--line); }
.step .num {
  counter-increment: step;
  font-family: var(--font-display);
  font-size: 26px;
  color: var(--brass);
}
.step .num::before { content: counter(step, decimal-leading-zero); }
.step h3 { font-size: 16.5px; margin-bottom: 6px; }
.step p { margin: 0; font-size: 14.5px; }

/* ---------- FAQ accordion ---------- */
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 24px 4px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  font-family: var(--font-display);
  font-size: 16.5px;
  color: var(--ink);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary .plus {
  flex-shrink: 0;
  width: 22px; height: 22px;
  position: relative;
}
.faq-item summary .plus::before, .faq-item summary .plus::after {
  content: "";
  position: absolute;
  background: var(--seal);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
}
.faq-item summary .plus::before { width: 14px; height: 1.5px; }
.faq-item summary .plus::after { width: 1.5px; height: 14px; transition: transform 0.2s ease; }
.faq-item[open] summary .plus::after { transform: translate(-50%, -50%) rotate(90deg) scaleY(0); }
.faq-item .faq-a { padding: 0 4px 26px; font-size: 14.5px; max-width: 68ch; }
.faq-cat { margin-bottom: 10px; }
.faq-cat h2 { font-size: 15px; letter-spacing: 0.1em; color: var(--brass); margin: 46px 0 6px; text-transform: none; }
.faq-cat:first-child h2 { margin-top: 0; }

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}
@media (max-width: 880px) { .contact-grid { grid-template-columns: 1fr; gap: 40px; } }
.info-list { list-style: none; margin: 0; padding: 0; }
.info-list li {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  font-size: 14.5px;
}
.info-list li:last-child { border-bottom: 1px solid var(--line); }
.info-list .label { color: var(--brass); letter-spacing: 0.08em; font-size: 12px; padding-top: 3px; }
.info-list a:hover { color: var(--seal); }

.field { margin-bottom: 20px; }
.field label { display: block; font-size: 13px; letter-spacing: 0.04em; color: var(--stone); margin-bottom: 8px; }
.field input, .field select, .field textarea {
  width: 100%;
  border: 1px solid var(--line-deep);
  background: #fff;
  padding: 13px 14px;
  font-family: var(--font-body);
  font-size: 14.5px;
  color: var(--ink);
  border-radius: var(--radius);
}
.field textarea { resize: vertical; min-height: 120px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 520px) { .field-row { grid-template-columns: 1fr; } }
.form-note { font-size: 12.5px; color: var(--stone-light); margin-top: 4px; }

/* ---------- CTA band ---------- */
.cta-band {
  background: var(--seal);
  color: #fff;
  padding: 58px 0;
  text-align: center;
}
.cta-band h2 { color: #fff; margin-bottom: 14px; }
.cta-band p { color: #FFF1E6; margin-bottom: 26px; }
.cta-band .btn-outline { border-color: #fff; color: #fff; }
.cta-band .btn-outline:hover { background: #fff; color: var(--seal); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--indigo-deep);
  color: #CFE9F5;
  padding: 60px 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
@media (max-width: 820px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-brand { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 14px; }
.footer-brand svg { width: 36px; height: 36px; flex-shrink: 0; }
.footer-brand .name { font-family: var(--font-display); color: #fff; font-size: 16px; }
.site-footer h4 {
  color: #fff;
  font-family: var(--font-body);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  margin-bottom: 16px;
}
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 10px; font-size: 13.5px; }
.site-footer a:hover { color: #fff; }
.footer-bottom {
  padding-top: 22px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 12px;
  color: #8FB4C7;
}
.footer-social {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  padding-top: 30px;
}
.footer-social-label {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: #8FB4C7;
  margin-right: 4px;
}
.social-icon {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: #CFE9F5;
  border: 1px solid rgba(255,255,255,0.16);
  border-radius: 999px;
  padding: 8px 14px 8px 10px;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.social-icon svg { flex-shrink: 0; color: #FFC9A0; }
.social-icon:hover { border-color: #FFC9A0; color: #fff; }

/* ---------- misc ---------- */
.mono-note {
  font-size: 12.5px;
  color: var(--stone-light);
  letter-spacing: 0.03em;
}
.divider-seal {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 0 0 44px;
}
.divider-seal svg { width: 26px; height: 26px; flex-shrink: 0; }
.divider-seal .line { flex-grow: 1; height: 1px; background: var(--line); }