/* ====================================
   CSS Variables - STEEL & STRENGTH Design
   ==================================== */
:root {
  /* Color Palette - Monochrome Strength */
  --color-black: #000000;
  --color-dark: #111111;
  --color-charcoal: #1a1a1a;
  --color-steel: #333333;
  --color-gray: #666666;
  --color-silver: #cccccc;
  --color-light: #f0f0f0;
  --color-white: #ffffff;

  /* Accent - Minimal & Sharp */
  --color-accent: #ffffff;
  --color-accent-dark: #000000;
  --color-border: rgba(255, 255, 255, 0.2);
  --color-border-dark: rgba(0, 0, 0, 0.1);

  /* Background Colors */
  --bg-body: #050505;
  --bg-section-dark: #111111;
  --bg-section-light: #ffffff;
  --bg-card-dark: #1a1a1a;
  --bg-card-light: #f5f5f5;

  /* Typography */
  --font-primary: "Noto Sans JP", sans-serif;
  --font-secondary: "Source Sans 3", sans-serif;

  /* Spacing - High Contrast */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1.5rem;
  --spacing-md: 3rem;
  --spacing-lg: 6rem;
  --spacing-xl: 10rem;
  --spacing-2xl: 15rem;

  /* Font Sizes - Massive & Impactful */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.25rem;
  --text-xl: 2rem;
  --text-2xl: 3rem;
  --text-3xl: 4.5rem;
  --text-4xl: 6rem;
  --text-5xl: 8rem;
  --text-huge: clamp(4rem, 15vw, 12rem);

  /* Layout */
  --max-width: 1600px;
  --border-radius: 0;

  /* Transitions - Sharp & Fast */
  --transition-fast: 0.15s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-base: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ====================================
   Reset & Base
   ==================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-light);
  background-color: var(--bg-body);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  filter: grayscale(100%) contrast(1.1);
  transition: filter var(--transition-base);
}

img.is-colored,
.is-colored {
  filter: grayscale(0%) contrast(1) !important;
}

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

ul {
  list-style: none;
}

/* ====================================
   Animations
   ==================================== */
@keyframes revealUp {
  from {
    opacity: 0;
    transform: translateY(50px);
  }

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

@keyframes revealText {
  from {
    transform: translateY(100%);
  }

  to {
    transform: translateY(0);
  }
}

.reveal-text-wrapper {
  overflow: hidden;
  display: block;
}

.reveal-text {
  display: block;
  animation: revealText 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* ====================================
   Utilities
   ==================================== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xl) 0;
  position: relative;
}

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

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

.section-header {
  margin-bottom: var(--spacing-lg);
  position: relative;
  border-top: 1px solid currentColor;
  padding-top: var(--spacing-sm);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.section-label {
  font-family: var(--font-secondary);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  opacity: 0.6;
}

.section-title {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 900;
  line-height: 0.9;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  margin-top: var(--spacing-sm);
}

.section-title-jp {
  display: block;
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-top: var(--spacing-xs);
  opacity: 0.8;
}

/* ====================================
   Hero Shared
   ==================================== */
.hero-bg {
  position: absolute;
  inset: 0;
  opacity: 0.6;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(100%) contrast(1.2) brightness(0.8);
}

.hero-content {
  position: relative;
  z-index: 10;
  width: 100%;
}

.hero-title-wrapper {
  mix-blend-mode: difference;
  color: var(--color-white);
}

.hero-main-text {
  font-family: var(--font-secondary);
  font-size: var(--text-huge);
  font-weight: 900;
  line-height: 0.85;
  letter-spacing: -0.04em;
  text-transform: uppercase;
  display: block;
}

.hero-sub-text {
  font-size: clamp(1.5rem, 3vw, 3rem);
  font-weight: 700;
  margin-top: var(--spacing-md);
  display: block;
  letter-spacing: 0.1em;
  mix-blend-mode: difference;
  color: var(--color-white);
  max-width: 50ch;
}

.news-single-hero .hero-main-text {
  line-height: 1.05;
  letter-spacing: -0.02em;
}

/* ====================================
   Header & Navigation
   ==================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--spacing-sm) 0;
  color: var(--color-white);
  background-color: rgba(150, 150, 150, 0.3); /* 追加：少しグレーの半透明背景 */
  backdrop-filter: blur(4px); /* 追加：わずかなぼかしで視認性向上 */
  transition:
    background-color var(--transition-base),
    padding var(--transition-base),
    backdrop-filter var(--transition-base);
}

.header.scrolled {
  background-color: rgba(245, 245, 245, 0.95);
  color: var(--color-black);
  padding: var(--spacing-xs) 0;
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.header.scrolled .hamburger,
.header.scrolled .hamburger::before,
.header.scrolled .hamburger::after {
  background-color: var(--color-black);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-img {
  height: 40px;
  /* Adjust height appropriately for the header */
  width: auto;
  display: block;
  object-fit: contain;
  filter: none !important;
}

/* Menu Toggle Button (Hidden on PC) */
.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 10px;
  position: relative;
  z-index: 1001;
  /* Above the navigation menu overlay */
}

.hamburger {
  display: block;
  width: 30px;
  height: 2px;
  background-color: var(--color-white);
  position: relative;
  transition: background-color var(--transition-base);
}

.hamburger::before,
.hamburger::after {
  content: "";
  position: absolute;
  left: 0;
  width: 30px;
  height: 2px;
  background-color: var(--color-white);
  transition: transform var(--transition-base);
}

.hamburger::before {
  top: -8px;
}

.hamburger::after {
  bottom: -8px;
}

/* Hamburger active state */
.menu-toggle.active .hamburger {
  background-color: transparent;
}

.menu-toggle.active .hamburger::before {
  transform: translateY(8px) rotate(45deg);
}

.menu-toggle.active .hamburger::after {
  transform: translateY(-8px) rotate(-45deg);
}

.nav-list {
  display: flex;
  gap: var(--spacing-md);
}

.nav-list a {
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  position: relative;
}

.nav-list a::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: currentColor;
  transition: width var(--transition-fast);
}

.nav-list a:hover::after {
  width: 100%;
}

.nav-cta {
  border: 1px solid currentColor;
  padding: 0.5rem 1.5rem;
}

.nav-cta:hover {
  background-color: var(--color-white);
  color: var(--color-black) !important;
}

.nav-cta::after {
  display: none !important;
}

/* ====================================
   Footer
   ==================================== */
.footer {
  background-color: var(--color-black);
  color: var(--color-white);
  padding: var(--spacing-xl) 0 var(--spacing-md);
  border-top: 1px solid var(--color-charcoal);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: var(--spacing-lg);
}

.footer-logo {
  font-size: var(--text-2xl);
  font-weight: 900;
  margin-bottom: var(--spacing-sm);
}

.footer-nav ul {
  display: flex;
  gap: var(--spacing-md);
}

.footer-nav a {
  font-size: var(--text-sm);
  font-weight: 700;
  opacity: 0.6;
}

.footer-nav a:hover {
  opacity: 1;
}

.copyright {
  font-family: var(--font-secondary);
  font-size: var(--text-xs);
  opacity: 0.3;
  text-align: center;
}

/* ====================================
   Buttons & Links
   ==================================== */
.btn-more {
  display: inline-block;
  padding: 1rem 3rem;
  border: 1px solid currentColor;
  font-family: var(--font-secondary);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: var(--text-sm);
  transition: all var(--transition-base);
}

.btn-more:hover {
  background-color: currentColor;
  color: var(--bg-body);
  padding: 1rem 3.5rem;
  /* Slight expansion */
}

/* Invert colors for dark background */
.section-dark .btn-more:hover {
  color: var(--color-black);
  background-color: var(--color-white);
}

.section-light .btn-more:hover {
  color: var(--color-white);
  background-color: var(--color-black);
}

/* ====================================
   Responsive (Common)
   ==================================== */
@media (max-width: 1023px) {
  .header-content {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
  }

  /* Mobile Navigation Overlay */
  .nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.95);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition:
      opacity var(--transition-base),
      visibility var(--transition-base);
    z-index: 1000;
    backdrop-filter: blur(10px);
  }

  .nav.active {
    opacity: 1;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--spacing-md);
    margin-top: 50px;
  }

  .nav-list a {
    font-size: var(--text-lg);
  }

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

  .section-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
  }

  .footer-content {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--spacing-md);
  }

  .footer-nav ul {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 767px) {
  .header {
    padding: 0.9rem 0;
  }

  .logo-img {
    height: 32px;
  }

  .nav-list {
    gap: var(--spacing-sm);
  }

  .nav-list a {
    font-size: var(--text-base);
  }

  .nav-cta {
    padding: 0.3rem 1rem;
  }

  .section {
    padding: var(--spacing-md) 0;
  }

  .hero {
    min-height: 680px;
    height: 100svh;
  }

  .hero-main-text {
    font-size: clamp(2.9rem, 14vw, 4.6rem);
    line-height: 0.92;
  }

  .hero-sub-text {
    font-size: clamp(1rem, 4.8vw, 1.4rem);
    margin-top: var(--spacing-sm);
    letter-spacing: 0.04em;
    max-width: 17ch;
  }

  .news-single-hero .hero-main-text {
    line-height: 1.08;
    letter-spacing: -0.01em;
  }

  .hero-scroll {
    right: var(--spacing-sm);
    bottom: var(--spacing-sm);
    font-size: 0.625rem;
  }

  .hero-scroll::after {
    height: 42px;
  }

  .section-title {
    font-size: clamp(2rem, 8vw, 3rem);
  }

  .section-title-jp {
    font-size: 1.1rem;
  }

  .container {
    padding: 0 var(--spacing-sm);
  }

  .btn-more {
    padding: 0.8rem 2rem;
  }

  .btn-more:hover {
    padding: 0.8rem 2.5rem;
  }

  .section-header {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
}