/* ==========================================================================
   nenex.net — Corporate Site Stylesheet
   Design system aligned with ArtEX Whitepaper v1.2
   Colors: navy #1a3a6c / gold #9c7c38 / white background
   Fonts:  BIZ UDPMincho (body) / BIZ UDPGothic (headings)
   ========================================================================== */

/* ===== ROOT VARIABLES ===== */
:root {
  --navy:        #1a3a6c;
  --navy-dark:   #0f2647;
  --navy-pale:   #f0f4fa;
  --gold:        #9c7c38;
  --gold-pale:   #faf6ed;
  --gold-dark:   #7a5f26;
  --white:       #ffffff;
  --off-white:   #fafaf7;
  --ink:         #1a1a1a;
  --muted:       #555555;
  --line:        #e4e4e4;
  --stripe:      #f7f7f5;

  --font-serif:  'BIZ UDPMincho', 'Noto Serif JP', 'Yu Mincho', 'Hiragino Mincho ProN', serif;
  --font-sans:   'BIZ UDPGothic', 'Noto Sans JP', 'Yu Gothic UI', 'Hiragino Kaku Gothic ProN', sans-serif;

  --nav-height:  76px;
  --radius:      2px;
  --transition:  0.3s ease;
  --shadow:      0 2px 24px rgba(26, 58, 108, 0.08);
  --max-width:   1200px;
}

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--white);
  color: var(--ink);
  font-family: var(--font-serif);
  font-feature-settings: 'palt' 1, 'pkna' 1;
  font-variant-numeric: tabular-nums;
  font-kerning: normal;
  line-height: 1.8;
  min-height: 100vh;
  overflow-x: hidden;
}
a { color: var(--navy); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--gold); }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  color: var(--navy);
  line-height: 1.4;
  font-weight: 700;
}
p { margin-bottom: 1em; }
em { font-style: italic; color: var(--gold-dark); }

/* ===== UTILITIES ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}
.num-gold { color: var(--gold); font-weight: 700; font-variant-numeric: tabular-nums; }
.divider {
  width: 60px;
  height: 2px;
  background: var(--gold);
  margin: 1.5rem 0;
}
.divider-center { margin: 1.5rem auto; }
.text-muted { color: var(--muted); font-size: 0.9rem; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mt-4 { margin-top: 4rem; }

/* ===== NAVIGATION ===== */
#main-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  z-index: 1000;
  height: var(--nav-height);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 2rem;
}
.nav-logo {
  display: inline-flex;
  align-items: center;
  height: 44px;
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--navy);
  text-transform: uppercase;
  white-space: nowrap;
  transition: opacity var(--transition);
}
.nav-logo:hover { opacity: 0.75; }
.nav-logo img {
  height: 100%;
  width: auto;
  display: block;
}
@media (max-width: 600px) {
  .nav-logo { height: 36px; }
}
.nav-links {
  display: flex;
  gap: 0;
  align-items: center;
}
.nav-links a {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--muted);
  padding: 0.5rem 1rem;
  transition: color var(--transition);
  white-space: nowrap;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--navy);
  border-bottom: 2px solid var(--gold);
}
.nav-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: 1.5rem;
}
.lang-btn {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--muted);
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: all var(--transition);
  cursor: pointer;
  background: var(--white);
}
.lang-btn:hover, .lang-btn.active {
  color: var(--white);
  background: var(--navy);
  border-color: var(--navy);
}
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  cursor: pointer;
  background: none;
  border: none;
}
.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--navy);
  transition: all var(--transition);
}
.nav-hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(6px, 6px); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(6px, -6px); }
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0; right: 0;
  background: rgba(255, 255, 255, 0.98);
  border-bottom: 1px solid var(--line);
  z-index: 999;
  padding: 1.5rem 2rem;
  flex-direction: column;
  gap: 0.25rem;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--muted);
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--line);
  display: block;
}
.mobile-menu a:hover, .mobile-menu a.active { color: var(--navy); }

/* ===== PAGE LAYOUT ===== */
.page-content { padding-top: var(--nav-height); min-height: 100vh; }

/* ===== HERO (Top Page) ===== */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-dark) 100%);
  color: var(--white);
  padding: 8rem 0 6rem;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%; left: -30%;
  width: 80%; height: 200%;
  background: radial-gradient(ellipse, rgba(156, 124, 56, 0.15) 0%, transparent 70%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}
.hero-eyebrow {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}
.hero h1 {
  font-family: var(--font-sans);
  font-size: clamp(2rem, 5vw, 3.5rem);
  color: var(--white);
  line-height: 1.3;
  margin-bottom: 1.5rem;
  letter-spacing: 0.02em;
}
.hero h1 .en {
  display: block;
  font-family: 'Georgia', 'Times New Roman', serif;
  font-style: italic;
  font-size: 0.55em;
  color: var(--gold);
  font-weight: 400;
  margin-top: 0.5rem;
  letter-spacing: 0.05em;
}
.hero-lead {
  font-size: 1.15rem;
  line-height: 1.9;
  max-width: 720px;
  color: rgba(255, 255, 255, 0.85);
  margin-top: 2rem;
}
.hero-lead em { color: var(--gold); font-style: normal; }

/* ===== SECTION ===== */
.section {
  padding: 5rem 0;
}
.section-alt { background: var(--stripe); }
.section-navy {
  background: var(--navy);
  color: var(--white);
}
.section-navy h2, .section-navy h3 { color: var(--white); }
.section-navy .num-gold { color: var(--gold); }

.section-eyebrow {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.section h2 {
  font-family: var(--font-sans);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  line-height: 1.3;
  margin-bottom: 1rem;
  color: var(--navy);
}
.section h2 .en {
  display: block;
  font-family: 'Georgia', 'Times New Roman', serif;
  font-style: italic;
  font-size: 0.5em;
  color: var(--gold);
  font-weight: 400;
  margin-top: 0.3rem;
  letter-spacing: 0.05em;
}
.section-navy h2 { color: var(--white); }
.section-navy h2 .en { color: var(--gold); }

.section h3 {
  font-family: var(--font-sans);
  font-size: 1.3rem;
  color: var(--navy);
  margin: 2rem 0 1rem;
}
.section p {
  font-size: 1rem;
  line-height: 1.9;
  max-width: 780px;
}

/* ===== CARD GRID ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}
.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 2rem;
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 100%;
  background: var(--gold);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.card-eyebrow {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.card h3 {
  font-family: var(--font-sans);
  font-size: 1.2rem;
  color: var(--navy);
  margin: 0 0 0.75rem;
}
.card p {
  font-size: 0.95rem;
  color: var(--ink);
  line-height: 1.8;
  margin-bottom: 1rem;
}
.card-link {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--gold);
  border-bottom: 1px solid var(--gold);
  padding-bottom: 2px;
}

/* ===== TABLE ===== */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.95rem;
}
th {
  background: var(--navy);
  color: var(--white);
  font-family: var(--font-sans);
  font-weight: 500;
  padding: 0.85rem 1rem;
  text-align: left;
  letter-spacing: 0.05em;
}
td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
tr:nth-child(even) td { background: var(--stripe); }
td.key {
  font-family: var(--font-sans);
  color: var(--navy);
  font-weight: 500;
  width: 30%;
  white-space: nowrap;
}

/* ===== KEY-VALUE LIST (Corporate Info) ===== */
.kv-list {
  display: grid;
  grid-template-columns: 30% 1fr;
  border-top: 1px solid var(--line);
}
.kv-list dt,
.kv-list dd {
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}
.kv-list dt {
  font-family: var(--font-sans);
  color: var(--navy);
  font-weight: 500;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
}
.kv-list dd {
  padding-left: 1.5rem;
  color: var(--ink);
}

/* ===== CALLOUT ===== */
.callout {
  padding: 1.5rem 2rem;
  border-radius: var(--radius);
  margin: 2rem 0;
  border-left: 4px solid var(--gold);
  background: var(--gold-pale);
}
.callout-navy {
  border-left-color: var(--navy);
  background: var(--navy-pale);
}
.callout strong {
  font-family: var(--font-sans);
  color: var(--navy);
}

/* ===== BUTTON ===== */
.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  padding: 0.85rem 2rem;
  border-radius: var(--radius);
  transition: all var(--transition);
  cursor: pointer;
  border: 1px solid var(--navy);
  background: var(--navy);
  color: var(--white);
}
.btn:hover {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--white);
}
.btn-outline {
  background: transparent;
  color: var(--navy);
}
.btn-outline:hover {
  background: var(--navy);
  color: var(--white);
}
.btn-group { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 2rem; }

/* ===== NEWS LIST ===== */
.news-list {
  border-top: 1px solid var(--line);
}
.news-item {
  display: flex;
  gap: 2rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
  transition: background var(--transition);
}
.news-item:hover { background: var(--gold-pale); }
.news-date {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--gold);
  font-weight: 500;
  min-width: 110px;
  letter-spacing: 0.05em;
}
.news-tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--navy);
  color: var(--navy);
  margin-right: 0.75rem;
  border-radius: var(--radius);
  text-transform: uppercase;
}
.news-title {
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--ink);
  font-weight: 500;
}

/* ===== FORM ===== */
form { max-width: 720px; }
.form-group { margin-bottom: 1.5rem; }
.form-group label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--navy);
  margin-bottom: 0.5rem;
  letter-spacing: 0.05em;
}
.form-group label .required { color: var(--gold); margin-left: 0.3em; }
input[type="text"], input[type="email"], input[type="tel"], textarea, select {
  width: 100%;
  padding: 0.85rem 1rem;
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color var(--transition);
  outline: none;
}
input:focus, textarea:focus, select:focus { border-color: var(--gold); }
textarea { resize: vertical; min-height: 140px; }
.form-note {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.5rem;
}

.form-inquiry-type {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.75rem;
}
.form-inquiry-type label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  margin-bottom: 0;
  transition: all var(--transition);
  background: var(--white);
}
.form-inquiry-type label:hover { border-color: var(--gold); background: var(--gold-pale); }
.form-inquiry-type input[type="radio"] { width: auto; margin: 0; accent-color: var(--navy); }

.form-status {
  padding: 1rem 1.5rem;
  margin-top: 1rem;
  border-radius: var(--radius);
  display: none;
  font-family: var(--font-sans);
}
.form-status.success { background: #e8f5e9; color: #2e7d32; border-left: 4px solid #2e7d32; display: block; }
.form-status.error { background: #ffebee; color: #c62828; border-left: 4px solid #c62828; display: block; }
.form-status.loading { background: var(--navy-pale); color: var(--navy); border-left: 4px solid var(--navy); display: block; }

/* ===== FOOTER ===== */
footer {
  background: var(--navy);
  color: rgba(255, 255, 255, 0.7);
  padding: 4rem 0 2rem;
  font-size: 0.9rem;
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}
.footer-brand {
  display: inline-flex;
  align-items: center;
  height: 40px;
  margin-bottom: 1.25rem;
}
.footer-brand img {
  height: 100%;
  width: auto;
  display: block;
}

.footer-tagline { font-size: 0.9rem; line-height: 1.8; color: rgba(255, 255, 255, 0.65); }
.footer h4 {
  font-family: var(--font-sans);
  color: var(--gold);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.footer ul li { margin-bottom: 0.6rem; }
.footer ul li a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
  transition: color var(--transition);
}
.footer ul li a:hover { color: var(--gold); }
.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.5);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .nav-links, .nav-right .lang-toggle { display: none; }
  .nav-hamburger { display: flex; }
  .nav-right { margin-left: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .kv-list { display: block; }
  .kv-list dt { padding-bottom: 0; border-bottom: none; }
  .kv-list dd { padding-left: 0; padding-top: 0.25rem; }
  .news-item { flex-direction: column; gap: 0.5rem; }
}
@media (max-width: 600px) {
  .container, .hero-inner, .nav-inner, .footer-inner { padding: 0 1.25rem; }
  .section { padding: 3rem 0; }
  .hero { padding: 5rem 0 4rem; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

/* ===== LANGUAGE VISIBILITY ===== */
[data-lang-en] { display: none; }
body.lang-en [data-lang-ja] { display: none; }
body.lang-en [data-lang-en] { display: initial; }
body.lang-en h1[data-lang-en], body.lang-en h2[data-lang-en], body.lang-en h3[data-lang-en],
body.lang-en p[data-lang-en], body.lang-en div[data-lang-en], body.lang-en li[data-lang-en] { display: block; }