/* ============================================
   KAGAMI INDUSTRIAL - Design System
   加賀美インダストリアル グローバルスタイル
   ============================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Shippori+Mincho:wght@400;500;600;700;800&family=Noto+Sans+JP:wght@300;400;500;700;900&family=Montserrat:wght@300;400;500;600;700;800;900&display=swap');

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Colors */
  --color-primary: #122C4F;
  --color-primary-light: #1a3d6e;
  --color-primary-dark: #0a1a30;
  --color-secondary: #E5E5E5;
  --color-secondary-dark: #CCCCCC;
  --color-accent: #C8A65E;
  --color-accent-light: #d4b876;
  --color-accent-dark: #a8893e;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-text-muted: #999999;
  --color-white: #FFFFFF;
  --color-black: #000000;
  --color-bg: #FAFAFA;
  --color-bg-alt: #F0F0F0;
  --color-border: #E0E0E0;

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

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 5rem;
  --space-3xl: 8rem;

  /* Layout */
  --max-width: 1200px;
  --header-height: 80px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.6s ease;
  --transition-glacial: 1.2s ease;

  /* Shadow */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.15);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.2);
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

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

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

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

a:hover {
  color: var(--color-accent);
}

ul, ol {
  list-style: none;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading-ja);
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-primary);
}

h1 { font-size: clamp(2rem, 4vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }
h4 { font-size: clamp(1.1rem, 2vw, 1.35rem); }

.en-text {
  font-family: var(--font-en);
  letter-spacing: 0.05em;
}

.section-label {
  font-family: var(--font-en);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  display: block;
  margin-bottom: var(--space-sm);
}

.section-title {
  position: relative;
  padding-bottom: var(--space-md);
  margin-bottom: var(--space-xl);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
}

.section-title.center {
  text-align: center;
}

.section-title.center::after {
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
}

/* ---------- Layout Utilities ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-3xl) 0;
}

.section--alt {
  background-color: var(--color-bg);
}

.section--dark {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.section--dark h2,
.section--dark h3,
.section--dark h4 {
  color: var(--color-white);
}

.section--dark .section-label {
  color: var(--color-accent-light);
}

.section--dark .section-title::after {
  background: linear-gradient(90deg, var(--color-accent), transparent);
}

.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.85rem 2rem;
  font-family: var(--font-en);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: none;
  border-radius: 0;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  transition: left 0.5s ease;
}

.btn:hover::before {
  left: 100%;
}

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn--primary:hover {
  background-color: var(--color-primary-light);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--accent {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.btn--accent:hover {
  background-color: var(--color-accent-dark);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-white);
  border: 1px solid var(--color-white);
}

.btn--outline:hover {
  background-color: var(--color-white);
  color: var(--color-primary);
}

/* ---------- Cards ---------- */
.card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  padding: var(--space-xl);
  transition: all var(--transition-base);
  position: relative;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card:hover::before {
  width: 100%;
}

.card__icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
  color: var(--color-accent);
}

.card__title {
  font-size: 1.15rem;
  margin-bottom: var(--space-sm);
  font-family: var(--font-heading-ja);
}

.card__text {
  color: var(--color-text-light);
  font-size: 0.9rem;
  line-height: 1.8;
}

/* ---------- Scroll Animations ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

.fade-in-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* ---------- Gold Shimmer Effect ---------- */
@keyframes goldShimmer {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}

.gold-shimmer {
  background: linear-gradient(
    90deg,
    var(--color-accent-dark),
    var(--color-accent-light),
    #f0d48a,
    var(--color-accent-light),
    var(--color-accent-dark)
  );
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: goldShimmer 4s ease infinite;
}

/* ---------- Page Header (Sub-pages) ---------- */
.page-header {
  position: relative;
  height: 350px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--color-primary);
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
  opacity: 0.95;
}

.page-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
}

.page-header__content {
  position: relative;
  z-index: 2;
}

.page-header__label {
  font-family: var(--font-en);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.page-header__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  color: var(--color-white);
  font-family: var(--font-heading-ja);
  font-weight: 700;
}

.page-header__subtitle {
  font-family: var(--font-en);
  font-size: 0.9rem;
  letter-spacing: 0.15em;
  color: rgba(255,255,255,0.6);
  margin-top: var(--space-sm);
  text-transform: uppercase;
}

/* geometric deco */
.page-header .geo-line {
  position: absolute;
  background: rgba(200, 166, 94, 0.08);
}

.page-header .geo-line--1 {
  width: 1px; height: 100%;
  left: 15%; top: 0;
}

.page-header .geo-line--2 {
  width: 1px; height: 100%;
  right: 20%; top: 0;
}

.page-header .geo-line--3 {
  width: 100%; height: 1px;
  left: 0; top: 40%;
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  padding: var(--space-md) 0;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb a {
  color: var(--color-text-muted);
}

.breadcrumb a:hover {
  color: var(--color-accent);
}

.breadcrumb span {
  margin: 0 0.5em;
}

/* ---------- Hidden Command Easter Egg ---------- */
.golden-sign-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.7);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s ease;
}

.golden-sign-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

@keyframes signAppear {
  0% { transform: scale(0.5) rotate(-10deg); opacity: 0; }
  50% { transform: scale(1.1) rotate(2deg); opacity: 1; }
  100% { transform: scale(1) rotate(0deg); opacity: 1; }
}

@keyframes goldParticle {
  0% { transform: translateY(0) rotate(0deg); opacity: 1; }
  100% { transform: translateY(-100vh) rotate(720deg); opacity: 0; }
}

.golden-sign {
  font-family: var(--font-heading-ja);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 800;
  background: linear-gradient(135deg, #C8A65E, #f0d48a, #C8A65E, #d4b876, #a8893e);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: signAppear 0.8s ease forwards;
  text-shadow: none;
  filter: drop-shadow(0 0 20px rgba(200, 166, 94, 0.5));
}

.gold-particle {
  position: fixed;
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  pointer-events: none;
  z-index: 10001;
  animation: goldParticle 2s ease-out forwards;
}

.gold-particle:nth-child(odd) {
  background: #f0d48a;
  width: 5px;
  height: 5px;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  :root {
    --header-height: 70px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .container {
    padding: 0 var(--space-md);
  }

  .section {
    padding: var(--space-2xl) 0;
  }

  .page-header {
    height: 280px;
  }

  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .section {
    padding: var(--space-xl) 0;
  }

  .page-header {
    height: 220px;
  }
}