/* ===== CSS VARIABLES ===== */
:root {
  /* Colors */
  --color-white: #FFFFFF;
  --color-black: #000000;
  --color-gray-50: #FAFAFA;
  --color-gray-100: #F5F5F5;
  --color-gray-200: #E5E5E5;
  --color-gray-300: #D4D4D4;
  --color-gray-400: #A3A3A3;
  --color-gray-500: #737373;
  --color-gray-600: #525252;
  --color-gray-700: #404040;
  --color-gray-800: #262626;
  --color-gray-900: #171717;

  /* Typography */
  --font-primary: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  --font-secondary: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Monaco', monospace;

  /* Font weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Font sizes - Fluid Typography */
  --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --font-size-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
  --font-size-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
  --font-size-lg: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);
  --font-size-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --font-size-2xl: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  --font-size-3xl: clamp(1.875rem, 1.6rem + 1.375vw, 2.5rem);
  --font-size-4xl: clamp(2.25rem, 1.9rem + 1.75vw, 3.5rem);
  --font-size-5xl: clamp(3rem, 2.4rem + 3vw, 5rem);
  --font-size-6xl: clamp(3.75rem, 3rem + 3.75vw, 6rem);
  --font-size-7xl: clamp(4.5rem, 3.5rem + 5vw, 8rem);

  /* Line heights */
  --line-height-tight: 1.1;
  --line-height-snug: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;

  /* Letter spacing */
  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0em;
  --letter-spacing-wide: 0.025em;
  --letter-spacing-wider: 0.05em;
  --letter-spacing-widest: 0.1em;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
  --space-40: 10rem;

  /* Container */
  --container-max-width: 90rem;
  --container-padding: clamp(1rem, 5vw, 3rem);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  --transition-slower: 0.8s ease;

  /* Cubic bezier curves */
  --ease-out-cubic: cubic-bezier(0.33, 1, 0.68, 1);
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);

  /* Z-index layers */
  --z-cursor: 10000;
  --z-nav: 1000;
  --z-modal: 999;
  --z-canvas: 1;
  --z-content: 10;
}

/* ===== BASE STYLES ===== */
html {
  scroll-behavior: smooth;
  font-size: 16px;
  overflow-x: hidden;
}

body {
  font-family: var(--font-secondary);
  font-weight: var(--font-weight-normal);
  color: var(--color-gray-900);
  background-color: var(--color-white);
  line-height: var(--line-height-normal);
  letter-spacing: var(--letter-spacing-normal);
  overflow-x: hidden;
  cursor: none;
  min-height: 100vh;
}

/* Hide WebGL canvas for fluid background */
#webgl-canvas {
  display: none !important;
}

/* ===== CUSTOM CURSOR ===== */
.cursor {
  position: fixed;
  width: 12px;
  height: 12px;
  background: #000000;
  border: 1px solid #ffffff;
  border-radius: 50%;
  pointer-events: none;
  z-index: 10000;
  transition: none;
  display: block;
  /* No transform - JavaScript will handle centering */
}

.cursor-trail {
  position: fixed;
  width: 32px;
  height: 32px;
  border: 1px solid rgba(0, 0, 0, 0.3);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transition: all 0.3s ease;
  display: block;
  /* No transform - JavaScript will handle centering */
}

.cursor--hover {
  transform: scale(2);
  background: transparent;
  border: 1px solid var(--color-black);
  mix-blend-mode: normal;
}

.cursor-trail--hover {
  transform: scale(0.5);
  opacity: 0.5;
}

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

.section {
  padding: var(--space-32) 0;
  position: relative;
  z-index: var(--z-content);
}

.section--dark {
  background-color: var(--color-gray-900);
  color: var(--color-white);
}

/* ===== SECTION HEADERS ===== */
.section__header {
  display: flex;
  align-items: baseline;
  gap: var(--space-8);
  margin-bottom: var(--space-24);
}

.section__number {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-400);
  letter-spacing: var(--letter-spacing-wider);
}

.section--dark .section__number {
  color: var(--color-gray-500);
}

.section__title {
  font-family: var(--font-primary);
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-light);
  letter-spacing: var(--letter-spacing-tight);
  line-height: var(--line-height-tight);
  color: var(--color-black);
}

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

/* ===== NAVIGATION ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  padding: var(--space-6) 0;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  transition: all var(--transition-base) var(--ease-out-cubic);
}

.nav--scrolled {
  padding: var(--space-4) 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(30px);
}

.nav__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.nav__brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  transition: all var(--transition-base) var(--ease-out-cubic);
}

.nav__brand {
  cursor: none;
}

.nav__brand:hover {
  /* No hover effects */
}

.nav__brand-main {
  font-family: var(--font-primary);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-black);
}

.nav__brand-sub {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  color: var(--color-gray-500);
  letter-spacing: var(--letter-spacing-wide);
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav__link {
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-600);
  letter-spacing: var(--letter-spacing-wide);
  position: relative;
  transition: all var(--transition-base) var(--ease-out-cubic);
  overflow: hidden;
  cursor: none;
}

.nav__link::before {
  content: attr(data-text);
  position: absolute;
  top: 0;
  left: 0;
  color: var(--color-black);
  transform: translateY(100%);
  transition: transform var(--transition-base) var(--ease-out-expo);
}

.nav__link:hover::before {
  transform: translateY(0);
}

.nav__link:hover {
  color: transparent;
}

.nav__controls {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.language-switcher {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-right: var(--space-4);
}

.language-switcher__link {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-500);
  text-decoration: none;
  padding: var(--space-1) var(--space-2);
  border-radius: 2px;
  transition: all var(--transition-base) var(--ease-out-cubic);
  cursor: none;
  letter-spacing: var(--letter-spacing-wide);
}

.language-switcher__link:hover {
  color: var(--color-black);
  background: var(--color-gray-100);
}

.language-switcher__link--active {
  color: var(--color-black);
  background: var(--color-gray-200);
}

.nav__toggle {
  display: none; /* Hidden by default, shown only on mobile via mobile-navigation.css */
}

/* Desktop Navigation Override - Ensure visibility */
@media (min-width: 769px) {
  .nav__menu {
    display: flex !important;
    visibility: visible !important;
    opacity: 1 !important;
    position: static !important;
    transform: none !important;
    pointer-events: auto !important;
    background: none !important;
    backdrop-filter: none !important;
    width: auto !important;
    height: auto !important;
    z-index: auto !important;
    transition: none !important;
    flex-direction: row !important;
    justify-content: flex-start !important;
    align-items: center !important;
    gap: var(--space-8) !important;
    margin: 0 !important;
    padding: 0 !important;
  }
}

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-32) 0;
  position: relative;
  z-index: var(--z-content);
}

.hero__content {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-16);
}

.hero__text {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-8);
}

.hero__title {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.hero__title-line {
  font-family: var(--font-primary);
  font-size: var(--font-size-7xl);
  font-weight: var(--font-weight-light);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-black);
}

.hero__title-sub {
  font-family: var(--font-mono);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-light);
  letter-spacing: var(--letter-spacing-widest);
  color: var(--color-gray-500);
  text-transform: uppercase;
}

.hero__description {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  color: var(--color-gray-600);
  max-width: 48rem;
  text-align: center;
}

.hero__cta {
  margin-top: var(--space-8);
}

.hero__meta {
  display: flex;
  justify-content: center;
  width: 100%;
}

.hero__stats {
  display: flex;
  gap: var(--space-16);
}

.stat {
  text-align: center;
  transition: all var(--transition-base) var(--ease-out-cubic);
}

.stat:hover {
  transform: translateY(-2px);
}

.stat__number {
  font-family: var(--font-primary);
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-light);
  line-height: var(--line-height-tight);
  color: var(--color-black);
}

.stat__label {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--letter-spacing-wider);
  text-transform: uppercase;
  color: var(--color-gray-400);
  margin-top: var(--space-1);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  border: 1px solid var(--color-black);
  background: var(--color-black);
  color: var(--color-white);
  text-decoration: none;
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--letter-spacing-wide);
  border-radius: 0;
  cursor: none;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base) var(--ease-out-cubic);
}

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

.btn--secondary {
  background: transparent;
  border-color: var(--color-black);
  color: var(--color-black);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.btn--primary:hover {
  background: var(--color-gray-800);
}

.btn--secondary:hover {
  background: var(--color-black);
  color: var(--color-white);
}

.btn__particles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: hidden;
}

/* ===== ABOUT SECTION ===== */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-20);
  align-items: start;
}

.about__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.about__company {
  font-family: var(--font-primary);
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-light);
  line-height: var(--line-height-tight);
  color: var(--color-black);
  margin-bottom: var(--space-4);
}

.about__description {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.about__description p {
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--color-gray-600);
}

.about__quote {
  border-left: 1px solid var(--color-gray-300);
  padding-left: var(--space-6);
  margin: var(--space-8) 0;
}

.about__quote blockquote p {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  color: var(--color-black);
  font-style: italic;
  font-weight: var(--font-weight-light);
}

.about__visual {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.about__capabilities {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.capability {
  padding: var(--space-4);
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition-base) var(--ease-out-cubic);
}

.capability:hover {
  border-color: var(--color-gray-400);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.capability h4 {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-2);
  color: var(--color-black);
}

.capability p {
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
  line-height: var(--line-height-relaxed);
}

/* ===== COMPANY SECTION ===== */
.company__content {
  padding: var(--space-12) 0;
}

.company__info {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.company__details {
  background: var(--color-gray-50);
  border: 1px solid var(--color-gray-200);
  border-radius: 0;
  padding: var(--space-12);
  /* Fixed dimensions to prevent layout thrashing */
  width: 100%;
  max-width: 600px;
  min-height: 200px;
  /* Only transition safe properties - avoid 'all' */
  transition: border-color var(--transition-base) var(--ease-out-cubic),
              box-shadow var(--transition-base) var(--ease-out-cubic);
  /* Prevent dynamic resizing */
  box-sizing: border-box;
  /* Force GPU acceleration for stable rendering */
  will-change: border-color, box-shadow;
  transform: translateZ(0);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.company__details:hover {
  border-color: var(--color-gray-400);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.company__name {
  font-family: var(--font-primary);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-light);
  line-height: var(--line-height-tight);
  color: var(--color-black);
  margin-bottom: var(--space-6);
}

.company__address {
  font-family: var(--font-secondary);
  font-size: var(--font-size-base);
  font-style: normal;
  line-height: var(--line-height-relaxed);
  color: var(--color-gray-600);
}

/* Force visibility for company section - CRITICAL */
section.section#company,
section#company,
#company {
  visibility: visible !important;
  opacity: 1 !important;
  display: block !important;
}

.company__content,
.company__info,
.company__name,
.company__address {
  visibility: visible !important;
  opacity: 1 !important;
  display: block !important;
  transform: none !important;
}

/* Preserve flex layout for section header */
#company .section__header {
  display: flex !important;
  align-items: baseline !important;
}

#company .section__title,
#company .section__number {
  display: block !important;
  opacity: 1 !important;
  visibility: visible !important;
  transform: none !important;
}

/* Override data-reveal for company section */
.company__content [data-reveal],
.company__info[data-reveal],
.company__details[data-reveal],
#company [data-reveal] {
  opacity: 1 !important;
  transform: none !important;
  visibility: visible !important;
}

/* Ensure company details uses flexbox */
.company__details {
  display: flex !important;
  flex-direction: column !important;
  justify-content: center !important;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .hero__stats {
    gap: var(--space-12);
  }

  .about__grid {
    grid-template-columns: 1fr;
    gap: var(--space-16);
  }
}

@media (max-width: 768px) {
  /* カーソルとナビゲーションは mobile-fix.css で制御 */

  .section {
    padding: var(--space-20) 0;
  }

  .section__header {
    flex-direction: column;
    gap: var(--space-4);
    margin-bottom: var(--space-16);
  }

  .hero__stats {
    flex-direction: column;
    gap: var(--space-8);
    text-align: center;
  }

  .hero__meta {
    margin-top: var(--space-12);
  }

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

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

  .capability:hover {
    transform: none;
    box-shadow: none;
  }
}

@media (max-width: 480px) {
  :root {
    --container-padding: 1rem;
  }

  .hero__description {
    font-size: var(--font-size-base);
  }

  .btn {
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-xs);
  }
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-contrast: high) {
  :root {
    --color-gray-400: #666666;
    --color-gray-500: #555555;
    --color-gray-600: #444444;
  }
}

/* ===== FOCUS STYLES ===== */
*:focus {
  outline: 2px solid var(--color-black);
  outline-offset: 2px;
}

.nav__link:focus,
.btn:focus {
  outline: 3px solid var(--color-black);
  outline-offset: 4px;
}