/* =========================================================
   鴻陽貿易株式会社 — Site styles
   Design system: IBM Carbon (flat-square, light display type,
   single blue accent, hairlines instead of shadows).
   ========================================================= */

:root {
  /* Surface */
  --canvas: #ffffff;
  --surface-1: #f4f4f4;
  --surface-2: #e0e0e0;
  --hairline: #e0e0e0;
  --hairline-strong: #161616;
  --inverse-canvas: #161616;
  --inverse-surface-1: #262626;

  /* Ink */
  --ink: #161616;
  --ink-muted: #525252;
  --ink-subtle: #8c8c8c;
  --inverse-ink: #ffffff;
  --inverse-ink-muted: #c6c6c6;

  /* Brand — deep navy (IBM Plex Blue 80-90 territory) */
  --primary: #002d9c;
  --blue-60: #001d6c;
  --blue-80: #001141;
  --blue-hover: #001d6c;

  /* Spacing */
  --s-xxs: 4px;
  --s-xs: 8px;
  --s-sm: 12px;
  --s-md: 16px;
  --s-lg: 24px;
  --s-xl: 32px;
  --s-xxl: 48px;
  --s-section: 96px;

  --max-w: 1312px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 56px;
}

body {
  margin: 0;
  font-family: 'IBM Plex Sans JP', 'IBM Plex Sans', -apple-system, BlinkMacSystemFont,
               'Hiragino Sans', 'Yu Gothic', 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.16px;
  color: var(--ink);
  background: var(--canvas);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, iframe { max-width: 100%; display: block; }

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.15s;
}
a:hover { color: var(--blue-60); }

h1, h2, h3, h4 { letter-spacing: 0; }

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--s-lg);
}
@media (min-width: 769px) {
  .container { padding: 0 var(--s-xl); }
}

/* =========================================================
   Header / nav
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
}
.header-inner {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  height: 56px;
}
.brand {
  display: inline-flex;
  align-items: center;
  font-weight: 600;
  font-size: 15px;
  color: var(--ink);
  letter-spacing: 0.02em;
}
.brand:hover { color: var(--ink); }

.site-nav {
  display: flex;
  align-items: stretch;
  height: 100%;
}
.site-nav a {
  display: inline-flex;
  align-items: center;
  padding: 0 var(--s-md);
  color: var(--ink);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.16px;
  border-bottom: 2px solid transparent;
  transition: border-color 0.15s, color 0.15s;
}
.site-nav a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  width: 56px;
  height: 56px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--ink);
  transition: transform 0.2s, opacity 0.2s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--canvas);
    flex-direction: column;
    align-items: stretch;
    border-bottom: 1px solid var(--hairline);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s, transform 0.2s;
    height: auto;
  }
  .site-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .site-nav a {
    padding: 16px var(--s-lg);
    border-bottom: 1px solid var(--hairline);
    height: auto;
  }
}

/* =========================================================
   Hero (homepage)
   ========================================================= */
.hero {
  position: relative;
  padding: 120px 0 96px;
  background: var(--canvas);
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 95% 0%, rgba(0, 45, 156, 0.12), transparent 60%),
    radial-gradient(ellipse 60% 50% at 0% 100%, rgba(0, 45, 156, 0.06), transparent 60%);
  pointer-events: none;
}
.hero .container { position: relative; }

.hero-eyebrow {
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.32px;
  color: var(--ink-muted);
  margin: 0 0 var(--s-lg);
  text-transform: uppercase;
}
.hero-title {
  font-size: clamp(40px, 7vw, 76px);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -0.4px;
  color: var(--ink);
  margin: 0 0 var(--s-lg);
}
.hero-tagline {
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 300;
  line-height: 1.4;
  color: var(--ink);
  margin: 0 0 var(--s-lg);
  letter-spacing: 0;
  max-width: 760px;
}
.hero-sub {
  font-size: 18px;
  line-height: 1.5;
  color: var(--ink-muted);
  max-width: 640px;
  margin: 0 0 var(--s-xxl);
}

.hero-cta-row {
  display: flex;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  max-width: 640px;
}
.hero-cta-row .btn { flex: 1; min-width: 0; }
@media (max-width: 480px) {
  .hero-cta-row { flex-direction: column; }
}

@media (max-width: 672px) {
  .hero { padding: 72px 0 64px; }
}

/* =========================================================
   Buttons
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  padding: 14px 16px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 400;
  line-height: 1.29;
  letter-spacing: 0.16px;
  border: 1px solid transparent;
  border-radius: 0;
  cursor: pointer;
  text-decoration: none;
  text-align: left;
  min-width: 220px;
  transition: background-color 0.15s, color 0.15s, border-color 0.15s;
}
.btn::after {
  content: '→';
  font-weight: 400;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover { background: var(--blue-hover); color: #fff; }
.btn-primary:active { background: var(--blue-80); color: #fff; }

.btn-secondary {
  background: var(--ink);
  color: #fff;
}
.btn-secondary:hover { background: #393939; color: #fff; }

.btn-tertiary {
  background: var(--canvas);
  border-color: var(--primary);
  color: var(--primary);
}
.btn-tertiary:hover { background: var(--primary); color: #fff; }

.btn-on-blue {
  background: var(--canvas);
  color: var(--ink);
}
.btn-on-blue:hover { background: var(--surface-1); color: var(--ink); }

.btn-ghost {
  background: transparent;
  color: var(--primary);
  padding: 0;
  min-width: 0;
  gap: 8px;
  letter-spacing: 0.16px;
}
.btn-ghost::after { transition: transform 0.15s; }
.btn-ghost:hover { color: var(--blue-60); }
.btn-ghost:hover::after { transform: translateX(4px); }

/* =========================================================
   Section
   ========================================================= */
.section { padding: var(--s-section) 0; }
@media (max-width: 672px) {
  .section { padding: 64px 0; }
}
.section-alt { background: var(--surface-1); }

.section-head { margin-bottom: 56px; }
.section-head .eyebrow {
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.32px;
  color: var(--ink-muted);
  text-transform: uppercase;
  margin: 0 0 var(--s-md);
}
.section-title {
  font-size: clamp(28px, 4.5vw, 42px);
  font-weight: 300;
  line-height: 1.2;
  color: var(--ink);
  margin: 0 0 var(--s-md);
  letter-spacing: 0;
}
.section-lead {
  font-size: 18px;
  line-height: 1.5;
  color: var(--ink-muted);
  max-width: 720px;
  margin: 0;
}

/* =========================================================
   About: info table
   ========================================================= */
.info-table {
  width: 100%;
  border-collapse: collapse;
  background: transparent;
  max-width: 880px;
}
.info-table tr { border-bottom: 1px solid var(--hairline); }
.info-table tr:first-child { border-top: 1px solid var(--hairline); }
.info-table th, .info-table td {
  padding: 24px 0;
  font-size: 16px;
  line-height: 1.5;
  text-align: left;
  vertical-align: top;
  letter-spacing: 0.16px;
}
.info-table th {
  width: 240px;
  font-weight: 400;
  color: var(--ink-muted);
  padding-right: var(--s-xl);
}
.info-table td { color: var(--ink); }
@media (max-width: 640px) {
  .info-table th, .info-table td {
    display: block;
    width: 100%;
    padding: 0;
  }
  .info-table th { padding-top: 20px; padding-bottom: 4px; }
  .info-table td { padding-bottom: 20px; }
  .info-table tr:first-child th { padding-top: 12px; }
}

/* =========================================================
   Business category grid (homepage)
   ========================================================= */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}
@media (max-width: 1056px) { .cat-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 672px)  { .cat-grid { grid-template-columns: 1fr; } }

.cat-card {
  background: var(--canvas);
  padding: 32px;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--ink);
  min-height: 280px;
  transition: background-color 0.15s;
}
.cat-card:hover { background: #fafafa; color: var(--ink); }
.cat-num {
  font-size: 12px;
  letter-spacing: 0.32px;
  color: var(--ink-subtle);
  margin-bottom: var(--s-md);
  text-transform: uppercase;
}
.cat-card h3 {
  font-size: 24px;
  font-weight: 400;
  line-height: 1.33;
  color: var(--ink);
  margin: 0 0 var(--s-md);
}
.cat-card p {
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-muted);
  margin: 0 0 var(--s-xl);
  flex: 1;
}
.cat-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  font-size: 14px;
  letter-spacing: 0.16px;
}
.cat-link::after { content: '→'; transition: transform 0.15s; }
.cat-card:hover .cat-link { color: var(--blue-60); }
.cat-card:hover .cat-link::after { transform: translateX(4px); }

/* =========================================================
   Access
   ========================================================= */
.access-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 48px;
  align-items: start;
}
@media (max-width: 768px) {
  .access-grid { grid-template-columns: 1fr; gap: 32px; }
}
.access-info h3 {
  font-size: 24px;
  font-weight: 400;
  line-height: 1.33;
  color: var(--ink);
  margin: 0 0 var(--s-md);
}
.addr {
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  margin: 0 0 var(--s-lg);
}
.map-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  font-size: 14px;
  letter-spacing: 0.16px;
}
.map-link::after { content: '→'; }
.map-link:hover { color: var(--blue-60); }

.map-frame {
  position: relative;
  padding-bottom: 62%;
  border: 1px solid var(--hairline);
  background: var(--surface-1);
  overflow: hidden;
}
.map-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* =========================================================
   Contact
   ========================================================= */
.contact-card {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  padding: 48px;
  max-width: 720px;
}
.contact-dl {
  margin: 0;
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 20px 32px;
  font-size: 16px;
  line-height: 1.5;
}
.contact-dl dt {
  font-weight: 400;
  color: var(--ink-muted);
  letter-spacing: 0.16px;
}
.contact-dl dd { margin: 0; color: var(--ink); }
@media (max-width: 640px) {
  .contact-card { padding: 32px 24px; }
  .contact-dl { grid-template-columns: 1fr; gap: 4px; }
  .contact-dl dt { margin-top: 16px; }
  .contact-dl dt:first-of-type { margin-top: 0; }
}

/* =========================================================
   CTA banner
   ========================================================= */
.cta-banner {
  background: var(--primary);
  color: #fff;
  padding: 96px 0;
}
.cta-banner-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  align-items: end;
}
@media (max-width: 768px) {
  .cta-banner { padding: 64px 0; }
  .cta-banner-inner { grid-template-columns: 1fr; gap: 32px; align-items: start; }
}
.cta-banner h2 {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 300;
  line-height: 1.2;
  margin: 0;
  color: #fff;
  max-width: 720px;
}
.cta-banner p {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.85);
  margin: var(--s-md) 0 0;
  max-width: 640px;
  line-height: 1.5;
}

/* =========================================================
   Subpage hero
   ========================================================= */
.subpage-hero {
  position: relative;
  padding: 64px 0 80px;
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
  overflow: hidden;
}
.subpage-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 70% at 90% 0%, rgba(0, 45, 156, 0.10), transparent 55%);
  pointer-events: none;
}
.subpage-hero .container { position: relative; }

.breadcrumb {
  font-size: 14px;
  letter-spacing: 0.16px;
  color: var(--ink-muted);
  margin-bottom: 40px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.breadcrumb a {
  color: var(--ink-muted);
  text-decoration: none;
}
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb-sep { color: var(--ink-subtle); }
.breadcrumb-current { color: var(--ink); }

.subpage-hero h1 {
  font-size: clamp(36px, 6vw, 60px);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -0.4px;
  color: var(--ink);
  margin: 0 0 var(--s-lg);
}
.subpage-hero .lead {
  font-size: clamp(18px, 2vw, 20px);
  line-height: 1.5;
  color: var(--ink-muted);
  max-width: 760px;
  margin: 0;
}

/* =========================================================
   Item grid (subpage 取扱品目)
   ========================================================= */
.item-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}
@media (max-width: 1056px) { .item-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 672px)  { .item-grid { grid-template-columns: 1fr; } }

.item-tile {
  background: var(--canvas);
  padding: 24px;
}
.item-tile .item-no {
  font-size: 12px;
  letter-spacing: 0.32px;
  color: var(--ink-subtle);
  margin-bottom: var(--s-xs);
}
.item-tile h4 {
  font-size: 18px;
  font-weight: 400;
  line-height: 1.4;
  margin: 0 0 var(--s-xs);
  color: var(--ink);
}
.item-tile p {
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-muted);
  margin: 0;
}

/* =========================================================
   Feature grid (subpage 強み)
   ========================================================= */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}
@media (max-width: 768px) { .feature-grid { grid-template-columns: 1fr; } }

.feature-card {
  background: var(--canvas);
  padding: 32px;
}
.feature-card .feat-no {
  font-size: 14px;
  font-weight: 400;
  color: var(--primary);
  letter-spacing: 0.16px;
  margin-bottom: var(--s-md);
}
.feature-card h3 {
  font-size: 20px;
  font-weight: 400;
  line-height: 1.4;
  margin: 0 0 var(--s-md);
  color: var(--ink);
}
.feature-card p {
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-muted);
  margin: 0;
}

/* =========================================================
   Flow steps (subpage 取引フロー)
   ========================================================= */
.flow {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}
@media (max-width: 1056px) { .flow { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 672px)  { .flow { grid-template-columns: 1fr; } }

.flow-step {
  background: var(--canvas);
  padding: 28px 24px;
}
.flow-step .step-no {
  font-size: 36px;
  font-weight: 300;
  color: var(--primary);
  line-height: 1;
  margin-bottom: var(--s-md);
  display: inline-block;
}
.flow-step h4 {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  margin: 0 0 var(--s-xs);
  color: var(--ink);
  letter-spacing: 0.16px;
}
.flow-step p {
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-muted);
  margin: 0;
}

/* =========================================================
   Region grid (subpage 主要取扱地域)
   ========================================================= */
.region-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}
@media (max-width: 768px) { .region-grid { grid-template-columns: repeat(2, 1fr); } }

.region-tile {
  background: var(--canvas);
  padding: 24px 20px;
  font-size: 16px;
  color: var(--ink);
  letter-spacing: 0.16px;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 88px;
}

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  background: var(--inverse-canvas);
  color: var(--inverse-ink-muted);
  padding: 64px 0 32px;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.footer-name {
  font-size: 24px;
  font-weight: 300;
  color: var(--inverse-ink);
  margin: 0;
  letter-spacing: 0;
}
.footer-romaji {
  font-size: 12px;
  letter-spacing: 0.32px;
  color: var(--inverse-ink-muted);
  text-transform: uppercase;
  margin: 8px 0 0;
}
.footer-addr {
  font-size: 14px;
  color: var(--inverse-ink-muted);
  letter-spacing: 0.16px;
  margin: 24px 0 0;
  line-height: 1.5;
}
.footer-copy {
  font-size: 12px;
  color: var(--inverse-ink-muted);
  opacity: 0.7;
  letter-spacing: 0.32px;
  margin: 32px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--inverse-surface-1);
}