/* ============================================
   PHOENIX CO., LTD. - GLOBAL STYLES
   Design System & Foundation
   ============================================ */

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

/* ============================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================ */
:root {
  /* Colors - Premium Palette */
  --color-primary: #B71C1C;
  /* Phoenix Red (flame color) */
  --color-primary-dark: #8B0000;
  --color-primary-light: #D32F2F;

  --color-black: #0A0A0A;
  --color-gray-900: #1A1A1A;
  --color-gray-800: #2D2D2D;
  --color-gray-700: #404040;
  --color-gray-600: #666666;
  --color-gray-500: #808080;
  --color-gray-400: #A0A0A0;
  --color-gray-300: #CCCCCC;
  --color-gray-200: #E5E5E5;
  --color-gray-100: #F5F5F5;
  --color-white: #FFFFFF;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #B71C1C 0%, #D32F2F 100%);
  --gradient-dark: linear-gradient(180deg, rgba(10, 10, 10, 0.95) 0%, rgba(26, 26, 26, 0.98) 100%);
  --gradient-overlay: linear-gradient(180deg, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.7) 100%);

  /* Typography */
  /* Typography */
  --font-heading: 'Noto Sans JP', sans-serif;
  --font-body: 'Noto Sans JP', sans-serif;

  --font-size-xs: 0.75rem;
  /* 12px */
  --font-size-sm: 0.875rem;
  /* 14px */
  --font-size-base: 1rem;
  /* 16px */
  --font-size-lg: 1.125rem;
  /* 18px */
  --font-size-xl: 1.25rem;
  /* 20px */
  --font-size-2xl: 1.5rem;
  /* 24px */
  --font-size-3xl: 1.875rem;
  /* 30px */
  --font-size-4xl: 2.25rem;
  /* 36px */
  --font-size-5xl: 3rem;
  /* 48px */
  --font-size-6xl: 3.75rem;
  /* 60px */
  --font-size-7xl: 4.5rem;
  /* 72px */

  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-black: 900;

  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Spacing Scale (8px base) */
  --space-1: 0.5rem;
  /* 8px */
  --space-2: 1rem;
  /* 16px */
  --space-3: 1.5rem;
  /* 24px */
  --space-4: 2rem;
  /* 32px */
  --space-5: 2.5rem;
  /* 40px */
  --space-6: 3rem;
  /* 48px */
  --space-8: 4rem;
  /* 64px */
  --space-10: 5rem;
  /* 80px */
  --space-12: 6rem;
  /* 96px */
  --space-16: 8rem;
  /* 128px */

  /* Border Radius */
  --radius-sm: 0.25rem;
  /* 4px */
  --radius-md: 0.5rem;
  /* 8px */
  --radius-lg: 1rem;
  /* 16px */
  --radius-xl: 1.5rem;
  /* 24px */
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
  --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-index Scale */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-tooltip: 700;

  /* Breakpoints (for reference in JS) */
  --breakpoint-mobile: 768px;
  --breakpoint-tablet: 1024px;
  --breakpoint-desktop: 1280px;
  --breakpoint-wide: 1536px;

  /* Container Max Width */
  --container-max-width: 1280px;
  --container-padding: var(--space-4);
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
*,
*::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 {
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-gray-900);
  background-color: var(--color-white);
  overflow-x: hidden;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-black);
  margin-bottom: var(--space-3);
}

h1 {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-black);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.01em;
}

h3 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
}

h4 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
}

h5 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
}

h6 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

p {
  margin-bottom: var(--space-3);
}

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

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

/* ============================================
   LAYOUT UTILITIES
   ============================================ */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  width: 100%;
}

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

.section-sm {
  padding-top: var(--space-8);
}

.section-lg {
  padding: var(--space-16) 0;
}

/* ============================================
   GRID SYSTEM
   ============================================ */
.grid {
  display: grid;
  gap: var(--space-4);
}

.grid-cols-1 {
  grid-template-columns: repeat(1, 1fr);
}

.grid-cols-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-cols-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-cols-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ============================================
   FLEXBOX UTILITIES
   ============================================ */
.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-1 {
  gap: var(--space-1);
}

.gap-2 {
  gap: var(--space-2);
}

.gap-3 {
  gap: var(--space-3);
}

.gap-4 {
  gap: var(--space-4);
}

.gap-6 {
  gap: var(--space-6);
}

/* ============================================
   BUTTON STYLES
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-heading);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  text-align: center;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-white);
  box-shadow: 0 4px 14px 0 rgba(183, 28, 28, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 rgba(183, 28, 28, 0.5);
  color: var(--color-white);
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-gray-900);
  border: 2px solid var(--color-gray-300);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border: 2px solid var(--color-white);
}

.btn-outline:hover {
  background: var(--color-white);
  color: var(--color-gray-900);
}

.btn-lg {
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-lg);
  width: auto;
  max-width: fit-content;
  display: inline-block;
}

/* ============================================
   ANIMATION UTILITIES
   ============================================ */
@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-50px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

.fade-in {
  animation: fadeIn var(--transition-slow) var(--transition-smooth);
}

.fade-in-up {
  animation: fadeInUp var(--transition-slow) var(--transition-smooth);
}

.slide-in-right {
  animation: slideInRight var(--transition-slow) var(--transition-smooth);
}

/* Scroll-triggered animations (controlled by JS) */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   GLASSMORPHISM EFFECT
   ============================================ */
.glass {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.glass-dark {
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* ============================================
   RESPONSIVE TYPOGRAPHY
   ============================================ */
@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2.5rem;
    /* 40px */
    --font-size-4xl: 2rem;
    /* 32px */
    --font-size-3xl: 1.5rem;
    /* 24px */
  }

  .container {
    --container-padding: var(--space-3);
  }

  .section {
    padding: var(--space-8) 0;
  }

  .section-lg {
    padding: var(--space-10) 0;
  }
}

/* ============================================
   RESPONSIVE GRID
   ============================================ */
@media (max-width: 768px) {

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

  .grid-cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================
   DESKTOP GRID ENFORCEMENT (≥1025px)
   ============================================ */
@media (min-width: 1025px) {
  .grid-cols-2 {
    grid-template-columns: repeat(2, 1fr) !important;
  }

  .grid-cols-3 {
    grid-template-columns: repeat(3, 1fr) !important;
  }

  .grid-cols-4 {
    grid-template-columns: repeat(4, 1fr) !important;
  }
}



/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.text-primary {
  color: var(--color-primary);
}

.text-white {
  color: var(--color-white);
}

.text-gray {
  color: var(--color-gray-600);
}

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

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

.bg-gray-100 {
  background-color: var(--color-gray-100);
}

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

.rounded {
  border-radius: var(--radius-md);
}

.rounded-lg {
  border-radius: var(--radius-lg);
}

.rounded-full {
  border-radius: var(--radius-full);
}

.shadow {
  box-shadow: var(--shadow-md);
}

.shadow-lg {
  box-shadow: var(--shadow-lg);
}

.shadow-xl {
  box-shadow: var(--shadow-xl);
}

.overflow-hidden {
  overflow: hidden;
}

.relative {
  position: relative;
}

.absolute {
  position: absolute;
}

.w-full {
  width: 100%;
}

.h-full {
  height: 100%;
}

.mb-2 {
  margin-bottom: var(--space-2);
}

.mb-3 {
  margin-bottom: var(--space-3);
}

.mb-4 {
  margin-bottom: var(--space-4);
}

.mb-6 {
  margin-bottom: var(--space-6);
}

.mb-8 {
  margin-bottom: var(--space-8);
}

.mt-2 {
  margin-top: var(--space-2);
}

.mt-3 {
  margin-top: var(--space-3);
}

.mt-4 {
  margin-top: var(--space-4);
}

.mt-6 {
  margin-top: var(--space-6);
}

/* ============================================
   IMAGE STYLES
   ============================================ */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

.img-cover {
  object-fit: cover;
  width: 100%;
  height: 100%;
}

.img-contain {
  object-fit: contain;
  width: 100%;
  height: 100%;
}

/* ============================================
   BACK TO TOP BUTTON
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 52px;
  height: 52px;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  color: var(--color-white);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(183, 28, 28, 0.45);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
  z-index: var(--z-fixed);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(183, 28, 28, 0.6);
}

.back-to-top:active {
  transform: translateY(-1px);
}

.back-to-top svg {
  display: block;
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .back-to-top {
    bottom: 1.25rem;
    right: 1.25rem;
    width: 44px;
    height: 44px;
  }
}