/* ============================================================
   合同会社BISIN — style.css
   Design System + All Pages
   ============================================================ */

/* ============================================================
   1. CSS Variables (Design Tokens)
   ============================================================ */
:root {
  /* Colors — Black × Gold */
  --color-bg:         #080807;
  --color-bg-2:       #0d0c09;
  --color-surface:    #141210;
  --color-surface-2:  #1a1815;
  --color-border:     rgba(201, 163, 75, 0.14);
  --color-border-2:   rgba(201, 163, 75, 0.32);

  --color-primary:    #C9A34B;   /* gold */
  --color-primary-dim:#7A6025;
  --color-accent:     #E8D9B5;   /* light cream gold */
  --color-silver:     #9A8E7A;

  --color-text:       #F2EDE4;
  --color-text-muted: #9A8E7A;
  --color-text-dim:   #5A5040;

  --color-white:      #ffffff;
  --color-danger:     #e05a5a;

  /* Gradients */
  --gradient-hero:    linear-gradient(135deg, #080807 0%, #0d0c09 50%, #111008 100%);
  --gradient-glow:    radial-gradient(ellipse at center, rgba(201,163,75,0.15) 0%, transparent 70%);
  --gradient-card:    linear-gradient(145deg, rgba(20,18,16,0.95) 0%, rgba(13,12,9,0.98) 100%);
  --gradient-cta:     linear-gradient(135deg, #0d0c09 0%, #161208 100%);

  /* Typography */
  --font-ja:          'Noto Serif JP', 'Yu Mincho', '游明朝', serif;
  --font-en:          'Montserrat', 'Helvetica Neue', sans-serif;
  --font-body:        'Noto Sans JP', 'Hiragino Kaku Gothic ProN', sans-serif;

  /* Spacing */
  --space-xs:   0.5rem;
  --space-sm:   1.25rem;
  --space-md:   2.5rem;
  --space-lg:   5rem;
  --space-xl:   8rem;
  --space-2xl:  12rem;

  /* Sizing */
  --container:  1200px;
  --nav-height: 72px;

  /* Borders */
  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-xl:  28px;

  /* Shadows */
  --shadow-glow:  0 0 40px rgba(201, 163, 75, 0.18);
  --shadow-card:  0 4px 32px rgba(0, 0, 0, 0.6);
  --shadow-btn:   0 4px 24px rgba(201, 163, 75, 0.45);

  /* Transitions */
  --transition:   0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   2. Reset & Base
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.8;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition);
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
}

address {
  font-style: normal;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   3. Typography
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-ja);
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0.04em;
}

/* H1 — ページタイトル / Hero */
h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  line-height: 1.25;
  letter-spacing: 0.06em;
}

/* H2 — セクション見出し */
h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.35;
  letter-spacing: 0.06em;
}

/* H3 — カード・リスト見出し */
h3 {
  font-size: clamp(1rem, 2vw, 1.25rem);
  line-height: 1.5;
  letter-spacing: 0.04em;
}

/* Body text */
p {
  font-size: 0.9625rem;
  line-height: 1.95;
  color: var(--color-text-muted);
}

.section-eyebrow {
  font-family: var(--font-en);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.section-title {
  font-family: var(--font-ja);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 400;
  color: var(--color-white);
  margin-bottom: 1.25rem;
  letter-spacing: 0.06em;
  line-height: 1.35;
}

.section-subtitle {
  font-size: 0.9625rem;
  color: var(--color-text-muted);
  line-height: 2;
  margin-bottom: var(--space-lg);
  max-width: 640px;
}

/* Section header block — eyebrow + title + subtitle をまとめたコンテナ */
.section-header {
  margin-bottom: var(--space-lg);
}

/* ============================================================
   4. Layout
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 2.5rem);
}

section {
  padding: clamp(5rem, 10vw, 8rem) 0;
}

/* Narrow content column for text-heavy sections */
.container--narrow {
  max-width: 800px;
}

/* ============================================================
   5. Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-en);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: all var(--transition);
  cursor: pointer;
  white-space: nowrap;
}

.btn--primary {
  background: linear-gradient(135deg, #D9B85C 0%, #C9A34B 55%, #A8862E 100%);
  color: #0a0905;
  border: 1px solid transparent;
  box-shadow: 0 2px 14px rgba(201,163,75,0.25), inset 0 1px 0 rgba(255,255,255,0.15);
  font-weight: 700;
}

.btn--primary:hover {
  background: linear-gradient(135deg, #E8C96A 0%, #D9B85C 55%, #C9A34B 100%);
  box-shadow: var(--shadow-btn), inset 0 1px 0 rgba(255,255,255,0.2);
  transform: translateY(-2px);
}

.btn--primary:active {
  transform: translateY(0);
  box-shadow: 0 1px 6px rgba(201,163,75,0.2);
}

.btn--outline {
  background: rgba(201,163,75,0.04);
  color: var(--color-accent);
  border: 1px solid var(--color-border-2);
}

.btn--outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(201,163,75,0.08);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(201,163,75,0.12);
}

.btn--outline:active {
  transform: translateY(0);
}

.btn--large {
  padding: 1.125rem 2.5rem;
  font-size: 0.9rem;
}

/* ============================================================
   6. Navigation
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(4, 13, 26, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition);
}

.site-header.scrolled {
  background: rgba(4, 13, 26, 0.98);
}

.nav {
  display: flex;
  align-items: center;
  height: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-md);
  gap: var(--space-md);
}

.nav__logo {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  margin-right: auto;
}

.nav__logo-en {
  font-family: var(--font-en);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--color-white);
}

.nav__logo-ja {
  font-family: var(--font-body);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  color: var(--color-text-muted);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav__links a {
  font-family: var(--font-body);
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  position: relative;
  padding-bottom: 2px;
}

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-primary);
  transition: width var(--transition);
}

.nav__links a:hover,
.nav__links a.nav__link--active {
  color: var(--color-white);
}

.nav__links a:hover::after,
.nav__links a.nav__link--active::after {
  width: 100%;
}

.nav__cta {
  font-family: var(--font-body);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  padding: 0.5rem 1.25rem;
  border: 1px solid var(--color-border-2);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
  transition: all var(--transition);
}

.nav__cta:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(201, 163, 75, 0.06);
}

.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: 4px;
}

.nav__hamburger span {
  display: block;
  height: 1px;
  background: var(--color-accent);
  transition: all var(--transition);
}

/* ============================================================
   6b. Language Switch UI
   ============================================================ */
/* Language Picker — dropdown */
.lang-picker {
  position: relative;
  flex-shrink: 0;
}

.lang-picker__trigger {
  display: flex;
  align-items: center;
  gap: 0.38rem;
  padding: 0.42rem 0.85rem;
  font-family: var(--font-en);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
  white-space: nowrap;
  line-height: 1;
}

.lang-picker__trigger:hover {
  color: var(--color-accent);
  border-color: rgba(201, 163, 75, 0.4);
  background: rgba(201, 163, 75, 0.05);
}

.lang-picker.open .lang-picker__trigger {
  color: var(--color-primary);
  border-color: rgba(201, 163, 75, 0.5);
  background: rgba(201, 163, 75, 0.07);
}

.lang-picker__globe {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
  opacity: 0.65;
}

.lang-picker__chevron {
  width: 11px;
  height: 11px;
  flex-shrink: 0;
  opacity: 0.55;
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}

.lang-picker.open .lang-picker__chevron {
  transform: rotate(180deg);
  opacity: 0.9;
}

/* Dropdown panel */
.lang-picker__panel {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 172px;
  background: var(--color-surface);
  border: 1px solid rgba(201, 163, 75, 0.18);
  border-radius: var(--radius-md);
  box-shadow:
    0 4px 6px rgba(0, 0, 0, 0.3),
    0 16px 48px rgba(0, 0, 0, 0.55),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
  overflow: hidden;
  opacity: 0;
  transform: translateY(-8px) scale(0.96);
  pointer-events: none;
  transition:
    opacity 0.22s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.22s cubic-bezier(0.22, 1, 0.36, 1);
  z-index: 1000;
  transform-origin: top right;
}

.lang-picker.open .lang-picker__panel {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.lang-picker__panel-header {
  padding: 0.55rem 1rem 0.45rem;
  font-family: var(--font-en);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-dim);
  border-bottom: 1px solid rgba(201, 163, 75, 0.08);
}

/* Options */
.lang-picker__item {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  width: 100%;
  padding: 0.72rem 1rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  border-top: 1px solid rgba(201, 163, 75, 0.05);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  text-align: left;
}

.lang-picker__item:first-of-type {
  border-top: none;
}

.lang-picker__item:hover {
  background: rgba(201, 163, 75, 0.07);
  color: var(--color-accent);
}

.lang-picker__item--active {
  color: var(--color-primary);
}

.lang-picker__item--active:hover {
  background: rgba(201, 163, 75, 0.09);
  color: var(--color-primary);
}

.lang-picker__code {
  font-family: var(--font-en);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-text-dim);
  background: rgba(201, 163, 75, 0.08);
  border: 1px solid rgba(201, 163, 75, 0.15);
  border-radius: 3px;
  padding: 0.1rem 0.38rem;
  min-width: 28px;
  text-align: center;
  flex-shrink: 0;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.lang-picker__item--active .lang-picker__code,
.lang-picker__item:hover .lang-picker__code {
  background: rgba(201, 163, 75, 0.18);
  border-color: rgba(201, 163, 75, 0.38);
  color: var(--color-primary);
}

.lang-picker__name {
  flex: 1;
  font-family: var(--font-body);
}

.lang-picker__check {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
  color: var(--color-primary);
  opacity: 0;
  transform: scale(0.6);
  transition: opacity 0.15s, transform 0.15s;
}

.lang-picker__item--active .lang-picker__check {
  opacity: 1;
  transform: scale(1);
}

@media (max-width: 768px) {
  .lang-picker {
    display: none;
  }
}

/* ============================================================
   7. Hero Section (index.html)
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--gradient-hero);
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

#particles-canvas {
  width: 100%;
  height: 100%;
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: calc(var(--nav-height) + 2rem) var(--space-md) var(--space-xl);
  max-width: 800px;
}

.hero__eyebrow {
  font-family: var(--font-en);
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.3s forwards;
}

.hero__title {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.5s forwards;
}

.hero__title-en {
  font-family: var(--font-en);
  font-size: clamp(4rem, 10vw, 8rem);
  font-weight: 200;
  letter-spacing: 0.2em;
  color: var(--color-white);
  line-height: 1;
  text-shadow: 0 0 80px rgba(201, 163, 75, 0.25);
}

.hero__title-ja {
  font-family: var(--font-ja);
  font-size: clamp(1rem, 2.5vw, 1.5rem);
  font-weight: 300;
  letter-spacing: 0.15em;
  color: var(--color-accent);
}

.hero__desc {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 2.2;
  margin-bottom: var(--space-lg);
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.7s forwards;
}

.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.9s forwards;
}

.hero__scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  z-index: 1;
  opacity: 0;
  animation: fadeIn 1s ease 1.5s forwards;
}

.hero__scroll-indicator span {
  font-family: var(--font-en);
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  color: var(--color-text-dim);
}

.hero__scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--color-primary), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

/* ============================================================
   8. Overview Cards (index.html)
   ============================================================ */
.overview {
  background: var(--color-bg-2);
  padding: var(--space-xl) 0;
}

.overview__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.overview-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-lg) var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: 0 2px 16px rgba(0,0,0,0.35);
}

.overview-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.overview-card:hover {
  background: var(--color-surface-2);
  border-color: var(--color-border-2);
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 12px 40px rgba(0,0,0,0.5), 0 0 0 1px rgba(201,163,75,0.12);
}

.overview-card:hover::before {
  transform: scaleX(1);
}

.overview-card__en {
  font-family: var(--font-en);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.overview-card__title {
  font-family: var(--font-ja);
  font-size: 1.25rem;
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.overview-card__desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.8;
  flex: 1;
}

.overview-card__arrow {
  display: inline-block;
  margin-top: var(--space-md);
  font-size: 1.25rem;
  color: var(--color-primary);
  transition: transform var(--transition);
}

.overview-card:hover .overview-card__arrow {
  transform: translateX(6px);
}

/* ============================================================
   9. Stats Section
   ============================================================ */
.stats-section {
  background: var(--color-bg);
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  text-align: center;
}

.stat {
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.stat__number {
  font-family: var(--font-en);
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 200;
  color: var(--color-white);
  line-height: 1;
  letter-spacing: -0.02em;
}

.stat__unit {
  font-family: var(--font-en);
  font-size: 1rem;
  color: var(--color-primary);
  font-weight: 300;
  margin-left: 0.25rem;
}

.stat__label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
  margin-top: 0.5rem;
}

/* ============================================================
   10. CTA Banner
   ============================================================ */
.cta-banner {
  background: var(--gradient-cta);
  border-top: 1px solid var(--color-border);
  text-align: center;
  padding: var(--space-xl) 0;
}

.cta-banner__title {
  font-family: var(--font-ja);
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.cta-banner__desc {
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  font-size: 0.95rem;
}

/* ============================================================
   11. Page Hero (内ページ共通)
   ============================================================ */
.page-hero {
  padding: calc(var(--nav-height) + var(--space-xl)) 0 var(--space-xl);
  background: var(--gradient-hero);
  border-bottom: 1px solid var(--color-border);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-glow);
  pointer-events: none;
}

.page-hero__en {
  font-family: var(--font-en);
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.page-hero__title {
  font-family: var(--font-ja);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 300;
  color: var(--color-white);
  letter-spacing: 0.08em;
  margin-bottom: var(--space-sm);
}

.page-hero__desc {
  color: var(--color-text-muted);
  font-size: 1rem;
  line-height: 2;
}

/* ============================================================
   12. About Page
   ============================================================ */
.about-mission {
  background: var(--color-bg);
}

.about-mission__body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: center;
}

.about-mission__text p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
  font-size: 0.95rem;
  line-height: 2;
}

.about-mission__visual {
  position: relative;
  height: 400px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-mission__glow {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(ellipse, rgba(201,163,75,0.25) 0%, rgba(201,163,75,0.05) 50%, transparent 70%);
  animation: pulse 4s ease-in-out infinite;
}

.about-values {
  background: var(--color-bg-2);
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.value-card {
  padding: var(--space-lg) var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  box-shadow: 0 2px 16px rgba(0,0,0,0.35);
}

.value-card:hover {
  border-color: var(--color-border-2);
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 16px 48px rgba(0,0,0,0.5), 0 0 0 1px rgba(201,163,75,0.1);
}

.value-card__num {
  font-family: var(--font-en);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.value-card__title {
  font-family: var(--font-ja);
  font-size: 1.1rem;
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.value-card__desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.9;
}

.company-info {
  background: var(--color-bg);
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-lg);
  font-size: 0.9rem;
}

.info-table tr {
  border-bottom: 1px solid var(--color-border);
}

.info-table th {
  width: 200px;
  padding: 1.25rem var(--space-md);
  text-align: left;
  color: var(--color-text-muted);
  font-weight: 400;
  font-family: var(--font-body);
  letter-spacing: 0.05em;
  vertical-align: top;
}

.info-table td {
  padding: 1.25rem var(--space-md);
  color: var(--color-text);
  line-height: 1.8;
}

.info-table a {
  color: var(--color-primary);
}

.info-table a:hover {
  text-decoration: underline;
}

/* ============================================================
   13. Product Page
   ============================================================ */
.product-showcase {
  background: var(--color-bg);
}

.product-showcase__body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.product-image-placeholder {
  position: relative;
  height: 480px;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.product-image-label {
  font-family: var(--font-en);
  font-size: 2rem;
  font-weight: 200;
  letter-spacing: 0.4em;
  color: rgba(255,255,255,0.15);
  z-index: 1;
}

.product-image-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(201,163,75,0.12) 0%, transparent 65%);
  animation: pulse 5s ease-in-out infinite;
}

.product-showcase__intro p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 2;
  margin-bottom: var(--space-sm);
}

.product-showcase__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: var(--space-md);
}

.badge {
  font-family: var(--font-en);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  padding: 0.375rem 0.875rem;
  border: 1px solid var(--color-border-2);
  border-radius: 2px;
  color: var(--color-accent);
  background: rgba(201,163,75,0.05);
}

.product-features {
  background: var(--color-bg-2);
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  margin-top: var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.feature-item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: var(--space-md);
  align-items: start;
  padding: var(--space-md) var(--space-md);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  border-left: 2px solid transparent;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.feature-item:last-child {
  border-bottom: none;
}

.feature-item:hover {
  background: var(--color-surface-2);
  border-left-color: var(--color-primary);
  transform: translateX(4px);
}

.feature-item__icon {
  font-family: var(--font-en);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  padding-top: 0.25rem;
}

.feature-item__body h3 {
  font-family: var(--font-ja);
  font-size: 1rem;
  color: var(--color-white);
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.feature-item__body p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.9;
}

.product-specs {
  background: var(--color-bg);
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-lg);
  font-size: 0.875rem;
}

.specs-table tr {
  border-bottom: 1px solid var(--color-border);
}

.specs-table th {
  padding: 1rem var(--space-md);
  text-align: left;
  color: var(--color-text-muted);
  font-weight: 400;
  background: var(--color-surface);
  width: 20%;
}

.specs-table td {
  padding: 1rem var(--space-md);
  color: var(--color-text);
}

.product-specs-title,
.product-specs .section-title {
  margin-bottom: 0;
}

/* ============================================================
   14. Service Page
   ============================================================ */
.service-cards {
  background: var(--color-bg);
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.service-card {
  padding: var(--space-lg) var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: 0 2px 16px rgba(0,0,0,0.35);
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), rgba(201,163,75,0.2), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.service-card:hover {
  border-color: var(--color-border-2);
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 20px 56px rgba(0,0,0,0.55), 0 0 0 1px rgba(201,163,75,0.12);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-card__num {
  font-family: var(--font-en);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.service-card__title {
  font-family: var(--font-ja);
  font-size: 1.15rem;
  color: var(--color-white);
  margin-bottom: var(--space-sm);
  font-weight: 400;
}

.service-card__desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.9;
  margin-bottom: var(--space-md);
}

.service-card__list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.service-card__list li {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  padding-left: 1rem;
  position: relative;
}

.service-card__list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-size: 0.65rem;
}

.service-flow {
  background: var(--color-bg-2);
}

.flow-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: var(--space-lg);
  position: relative;
}

.flow-list::before {
  content: '';
  position: absolute;
  left: 28px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--color-border);
}

.flow-step {
  display: flex;
  gap: var(--space-md);
  padding-bottom: var(--space-lg);
  position: relative;
}

.flow-step:last-child {
  padding-bottom: 0;
}

.flow-step__num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  min-width: 56px;
  border-radius: 50%;
  border: 1px solid var(--color-border-2);
  background: var(--color-surface);
  font-family: var(--font-en);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  z-index: 1;
}

.flow-step__body {
  padding-top: 0.75rem;
}

.flow-step__body h3 {
  font-family: var(--font-ja);
  font-size: 1.05rem;
  color: var(--color-white);
  margin-bottom: 0.5rem;
  font-weight: 400;
}

.flow-step__body p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.9;
}

.flow-step__note {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 0.75rem !important;
  color: var(--color-text-dim) !important;
  border: 1px solid var(--color-border);
  padding: 0.25rem 0.75rem;
  border-radius: 2px;
}

.service-plans {
  background: var(--color-bg);
}

.plan-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-lg);
  align-items: start;
}

.plan-card {
  padding: var(--space-lg) var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-align: center;
  position: relative;
  box-shadow: 0 2px 16px rgba(0,0,0,0.35);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.plan-card:hover {
  transform: translateY(-6px) scale(1.02);
  border-color: var(--color-border-2);
  box-shadow: 0 16px 48px rgba(0,0,0,0.5);
}

.plan-card--featured {
  border-color: var(--color-primary);
  background: linear-gradient(160deg, var(--color-surface-2) 0%, rgba(20,18,16,0.98) 100%);
  box-shadow: var(--shadow-glow), 0 2px 24px rgba(0,0,0,0.5);
}

.plan-card--featured:hover {
  transform: translateY(-8px) scale(1.03);
  box-shadow: 0 0 60px rgba(201,163,75,0.22), 0 20px 56px rgba(0,0,0,0.6);
}

.plan-card__badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: var(--color-bg);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 0.25rem 1rem;
  border-radius: 2px;
}

.plan-card__name {
  font-family: var(--font-ja);
  font-size: 1.1rem;
  color: var(--color-white);
  margin-bottom: var(--space-md);
  padding-top: var(--space-xs);
}

.plan-card__features {
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: var(--space-lg);
}

.plan-card__features li {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  padding-left: 1.25rem;
  position: relative;
}

.plan-card__features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-size: 0.75rem;
}

/* ============================================================
   15. Contact Page
   ============================================================ */
.contact-section {
  background: var(--color-bg);
}

.contact-body {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.contact-info {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-md));
}

.contact-info__title {
  font-family: var(--font-ja);
  font-size: 1.1rem;
  color: var(--color-white);
  margin-bottom: var(--space-md);
  font-weight: 400;
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.contact-info__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.contact-info__item {
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

.contact-info__item dt {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--color-primary);
  text-transform: uppercase;
  font-family: var(--font-en);
  margin-bottom: 0.375rem;
}

.contact-info__item dd {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

.contact-info__item a {
  color: var(--color-accent);
  transition: color var(--transition);
}

.contact-info__item a:hover {
  color: var(--color-primary);
}

.contact-info__note {
  padding: var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.contact-info__note h3 {
  font-family: var(--font-ja);
  font-size: 0.9rem;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
  font-weight: 400;
}

.contact-info__note ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.contact-info__note li {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  padding-left: 1rem;
  position: relative;
  line-height: 1.7;
}

.contact-info__note li::before {
  content: 'Q.';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-size: 0.65rem;
  font-family: var(--font-en);
  font-weight: 600;
  top: 0.1rem;
}

.contact-form-wrap__title {
  font-family: var(--font-ja);
  font-size: 1.1rem;
  color: var(--color-white);
  font-weight: 400;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group--full {
  grid-column: 1 / -1;
}

.form-group label {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

.form-group input,
.form-group select,
.form-group textarea {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.875rem 1rem;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.9rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
}

.form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%234FC3E8' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(201,163,75,0.15);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-dim);
  font-size: 0.85rem;
}

.form-group textarea {
  resize: vertical;
  min-height: 140px;
  line-height: 1.8;
}

.required {
  color: var(--color-danger);
  font-size: 0.75rem;
  margin-left: 0.25rem;
}

.checkbox-group {
  border: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-label {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}

.checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.checkbox-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  min-width: 16px;
  margin-top: 0.2rem;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.checkbox-label a {
  color: var(--color-primary);
  text-decoration: underline;
}

.form-group--submit {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-sm);
}

.form-note {
  font-size: 0.75rem;
  color: var(--color-text-dim);
  line-height: 1.7;
}

/* ============================================================
   16. Footer
   ============================================================ */
.site-footer {
  background: var(--color-bg-2);
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) 0 var(--space-md);
}

.footer__body {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-md);
}

/* footer logo/tagline moved to section 16b */

.footer__nav ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  text-align: right;
}

.footer__nav a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.footer__nav a:hover {
  color: var(--color-primary);
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.footer__copy {
  font-family: var(--font-en);
  font-size: 0.75rem;
  color: var(--color-text-dim);
  letter-spacing: 0.05em;
}

.footer__legal {
  display: flex;
  gap: var(--space-md);
}

.footer__legal a {
  font-size: 0.75rem;
  color: var(--color-text-dim);
  transition: color var(--transition);
}

.footer__legal a:hover {
  color: var(--color-primary);
}

/* ============================================================
   16b. BISIN Logo & LINE Banner
   ============================================================ */

/* Pink "BI" letters in logo */
.logo-bi {
  color: #E75480;
}

/* Footer brand extended */
.footer__logo-mark {
  font-family: var(--font-en);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-white);
  line-height: 1;
  margin-bottom: 0.2rem;
}

.footer__logo-llc {
  font-family: var(--font-en);
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  color: var(--color-text-dim);
  margin-bottom: 0.2rem;
}

.footer__logo-ja {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
  margin-bottom: 0.3rem;
}

.footer__tagline {
  font-family: var(--font-en);
  font-size: 0.68rem;
  font-style: italic;
  color: var(--color-text-dim);
  letter-spacing: 0.04em;
  margin-bottom: 0.9rem;
}

.footer__stores {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.78rem;
  color: var(--color-text-dim);
}

.footer__stores a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition);
}

.footer__stores a:hover {
  color: var(--color-primary);
}

/* LINE Banner */
.line-banner {
  padding: var(--space-lg) 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.line-banner__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(2rem, 6vw, 5rem);
}

.line-banner__heading {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  font-size: clamp(1.3rem, 3.5vw, 2rem);
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 1.2rem;
  line-height: 1.3;
}

.line-banner__line-icon svg {
  display: block;
  width: 2em;
  height: 2em;
  flex-shrink: 0;
}

.line-banner__stores {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

.line-banner__store {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.line-banner__store-name {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--color-primary);
}

.line-banner__tel {
  font-family: var(--font-en);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color var(--transition);
}

.line-banner__tel:hover {
  color: var(--color-primary);
}

.line-banner__qr img {
  width: 130px;
  height: 130px;
  display: block;
  border-radius: var(--radius-sm);
}

@media (max-width: 768px) {
  .line-banner__inner {
    flex-direction: column;
    text-align: center;
    gap: 1.5rem;
  }
  .line-banner__heading {
    justify-content: center;
  }
  .line-banner__stores {
    justify-content: center;
  }
}

/* ============================================================
   17. Animations
   ============================================================ */
/* Stagger delays for grid children */
.fade-in-up.delay-1 { transition-delay: 0.1s; }
.fade-in-up.delay-2 { transition-delay: 0.2s; }
.fade-in-up.delay-3 { transition-delay: 0.3s; }
.fade-in-up.delay-4 { transition-delay: 0.4s; }

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes pulse {
  0%, 100% { transform: scale(1);   opacity: 0.6; }
  50%       { transform: scale(1.1); opacity: 1;   }
}

@keyframes scrollPulse {
  0%   { transform: scaleY(1);   opacity: 1; }
  50%  { transform: scaleY(0.6); opacity: 0.4; }
  100% { transform: scaleY(1);   opacity: 1; }
}

.fade-in-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.75s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.75s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   18. Responsive
   ============================================================ */
@media (max-width: 1024px) {
  .about-mission__body,
  .product-showcase__body {
    grid-template-columns: 1fr;
  }

  .about-mission__visual {
    height: 280px;
  }

  .contact-body {
    grid-template-columns: 1fr;
  }

  .contact-info {
    position: static;
  }
}

/* Mobile nav open state */
.nav__links--open {
  display: flex !important;
  flex-direction: column;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: rgba(4, 13, 26, 0.98);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md);
  gap: var(--space-sm);
  z-index: 999;
}

.nav__links--open a {
  font-size: 1rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.nav__cta--open {
  display: block !important;
  position: fixed;
  top: calc(var(--nav-height) + 4 * var(--space-md) + 4 * 2.5rem);
  left: var(--space-md);
  right: var(--space-md);
  z-index: 999;
  text-align: center;
  padding: 0.875rem;
}

.nav__hamburger.open span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav__hamburger.open span:nth-child(2) {
  opacity: 0;
}
.nav__hamburger.open span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Field error */
.field--error {
  border-color: var(--color-danger) !important;
  box-shadow: 0 0 0 3px rgba(224, 90, 90, 0.1) !important;
}

@media (max-width: 768px) {
  :root {
    --space-xl: 5rem;
    --space-lg: 3rem;
    --space-md: 1.75rem;
    --space-sm: 1rem;
  }

  .nav__links,
  .nav__cta {
    display: none;
  }

  .nav__hamburger {
    display: flex;
  }

  .overview__grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .stats-grid {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .stat {
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-lg) var(--space-md);
  }

  .values-grid,
  .service-grid,
  .plan-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer__body {
    flex-direction: column;
  }

  .footer__nav ul {
    text-align: left;
  }

  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero__title-en {
    font-size: clamp(3rem, 15vw, 5rem);
  }
}

@media (max-width: 480px) {
  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero__actions .btn {
    text-align: center;
  }

  .feature-item {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }
}