:root {
  --color-bg: #FCFCFC;
  --color-text: #1C1C1E;
  --color-accent: #000000;
  --color-muted: #8E8E93;
  --color-border: #E5E5EA;
  --color-white: #FFFFFF;
  
  /* Update font families to premium minimalist system fonts */
  --font-en: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-tw: "PingFang TC", "Hiragino Sans GB", "Yu Gothic", "Microsoft JhengHei", sans-serif;
  
  --header-height: 80px;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 8rem;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  font-family: var(--font-tw);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-en);
  font-weight: 500;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-sm);
}

.title-jp {
  font-family: var(--font-tw);
  font-weight: 400;
  font-size: 0.9rem;
  color: var(--color-muted);
  letter-spacing: 0.1em;
  display: block;
  margin-top: 5px;
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity 0.3s ease;
}

a:hover {
  opacity: 0.6;
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
  font-weight: 300;
}

/* Layout Utilities */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

.flex {
  display: flex;
}

.grid {
  display: grid;
}

/* Header & Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-md);
  z-index: 1000;
  background-color: transparent;
  transition: background-color 0.4s ease, backdrop-filter 0.4s ease;
}

.site-header.scrolled {
  background-color: rgba(252, 252, 252, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.logo {
  font-family: var(--font-en);
  font-weight: 600;
  font-size: 1.2rem;
  letter-spacing: 0.05em;
}

.main-nav ul {
  list-style: none;
  display: flex;
  gap: var(--spacing-md);
}

.main-nav a {
  font-family: var(--font-en);
  font-size: 0.9rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  position: relative;
}

.main-nav a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 1px;
  bottom: -4px;
  left: 0;
  background-color: var(--color-text);
  transition: width 0.3s ease;
}

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

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  z-index: 1001;
}

/* Hero Section */
.hero {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.hero img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -1;
  filter: brightness(0.9);
}

.hero-content {
  text-align: center;
  color: var(--color-text); /* Modify if hero image is dark */
  background: rgba(255, 255, 255, 0.6);
  padding: var(--spacing-lg);
  backdrop-filter: blur(15px);
  border-radius: 4px;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

.hero p {
  font-size: 1.2rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Base Buttons */
.btn {
  display: inline-block;
  padding: 12px 32px;
  border: 1px solid var(--color-text);
  background: transparent;
  color: var(--color-text);
  font-family: var(--font-en);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: all 0.3s ease;
  margin-top: var(--spacing-md);
}

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

/* Animation Classes */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 1s cubic-bezier(0.2, 0.8, 0.2, 1), transform 1s cubic-bezier(0.2, 0.8, 0.2, 1);
}

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

/* Grid Layouts for Products/Services */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
}

.card {
  position: relative;
  display: block;
}

.card img {
  width: 100%;
  aspect-ratio: 4/5;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.card-img-wrapper {
  overflow: hidden;
  margin-bottom: var(--spacing-sm);
}

.card:hover img {
  transform: scale(1.05);
}

.card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.2rem;
}

.card p {
  font-size: 0.9rem;
  color: var(--color-muted);
}

/* Contact Form Specifics */
.contact-form {
  max-width: 600px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.form-group {
  display: flex;
  flex-direction: column;
  text-align: left;
}

.form-group label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 5px;
  color: var(--color-muted);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 15px;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-text);
}

.form-group textarea {
  resize: vertical;
  min-height: 150px;
}

/* Footer Section */
.site-footer {
  padding: var(--spacing-lg) var(--spacing-md);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  max-width: 1200px;
  margin: 0 auto;
}

.footer-left {
  flex: 1;
}

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

.footer-nav a {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.copyright {
  font-size: 0.8rem;
  color: var(--color-muted);
  margin-top: var(--spacing-lg);
}

/* Responsive */
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  
  .main-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
  }
  
  .main-nav.active {
    opacity: 1;
    pointer-events: all;
  }
  
  .main-nav ul {
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
  }
  
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
  
  .footer-inner {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .site-header {
    background-color: var(--color-bg);
  }
}