:root {
  --color-primary: #0F172A;
  --color-secondary: #334155;
  --color-accent: #A3824C;
  --color-accent-hover: #8C6D3A;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F8FAFC;
  --color-border: #E2E8F0;
  --color-text: #1E293B;
  --color-text-muted: #64748B;
  --spacing-section: 120px;
  --layout-max-width: 1200px;
  --transition-standard: all 0.4s ease;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { 
  font-family: 'Noto Sans TC', sans-serif; 
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, .serif { font-family: 'Noto Serif TC', serif; font-weight: 600; }
a { text-decoration: none; color: inherit; transition: var(--transition-standard); }
ul { list-style: none; }
.container { max-width: var(--layout-max-width); margin: 0 auto; padding: 0 40px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.section-title { font-size: 36px; color: var(--color-primary); margin-bottom: 16px; line-height: 1.3; letter-spacing: 2px; }
.section-subtitle { font-size: 13px; text-transform: uppercase; letter-spacing: 4px; color: var(--color-accent); margin-bottom: 24px; display: block; font-weight: 500; }
.divider { width: 40px; height: 2px; background-color: var(--color-accent); margin-bottom: 40px; }
header { position: fixed; top: 0; left: 0; right: 0; background-color: rgba(255, 255, 255, 0.98); border-bottom: 1px solid var(--color-border); z-index: 1000; height: 80px; display: flex; align-items: center; }
.header-inner { display: flex; justify-content: space-between; align-items: center; width: 100%; }
.brand { display: flex; flex-direction: column; }
.brand-zh { font-size: 22px; color: var(--color-primary); letter-spacing: 4px; line-height: 1.2; }
.brand-en { font-size: 9px; color: var(--color-text-muted); letter-spacing: 2px; text-transform: uppercase; font-family: sans-serif; }
.nav-links { display: flex; gap: 48px; }
.nav-links a { font-size: 13px; letter-spacing: 1px; color: var(--color-secondary); font-weight: 500; position: relative; }
.nav-links a.active { color: var(--color-accent); }
.nav-links a::after { content: ''; position: absolute; bottom: -4px; left: 0; right: 0; height: 1px; background-color: var(--color-accent); transform: scaleX(0); transform-origin: right; transition: transform 0.4s ease; }
.nav-links a:hover::after, .nav-links a.active::after { transform: scaleX(1); transform-origin: left; }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 10px; z-index: 1001; }
.hamburger span { width: 24px; height: 2px; background: var(--color-primary); transition: 0.3s; }
.page-content { padding-top: 80px; min-height: calc(100vh - 150px); }
.hero { padding-top: 100px; padding-bottom: 120px; background-color: var(--color-bg-alt); border-bottom: 1px solid var(--color-border); overflow: hidden; }
.hero-content { max-width: 800px; }
.hero-tag { display: inline-block; padding: 6px 16px; border: 1px solid var(--color-accent); color: var(--color-accent); font-size: 11px; letter-spacing: 3px; text-transform: uppercase; margin-bottom: 40px; }
.hero-title { font-size: 56px; line-height: 1.2; color: var(--color-primary); margin-bottom: 32px; letter-spacing: 2px; }
.hero-desc { font-size: 18px; color: var(--color-text-muted); max-width: 600px; margin-bottom: 56px; font-weight: 300; }
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 18px 40px; font-size: 13px; letter-spacing: 2px; text-transform: uppercase; cursor: pointer; border: none; text-align: center; }
.btn-primary { background-color: var(--color-primary); color: #FFF; }
.btn-primary:hover { background-color: var(--color-accent); }
.btn-outline { background-color: transparent; color: var(--color-primary); border: 1px solid var(--color-primary); }
.btn-outline:hover { background-color: var(--color-primary); color: #FFF; }
.hero-actions { display: flex; gap: 24px; }
.section { padding: var(--spacing-section) 0; border-bottom: 1px solid var(--color-border); }
.brand-content { padding-right: 40px; }
.brand-text p { margin-bottom: 24px; color: var(--color-text-muted); font-size: 15px; }
.brand-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; margin-top: 48px; border-top: 1px solid var(--color-border); padding-top: 40px; }
.stat-item { display: flex; flex-direction: column; }
.stat-num { font-size: 36px; color: var(--color-primary); line-height: 1; margin-bottom: 8px; }
.stat-label { font-size: 12px; color: var(--color-text-muted); letter-spacing: 1px; text-transform: uppercase; }
.brand-image-placeholder { background-color: var(--color-primary); height: 100%; min-height: 500px; display: flex; flex-direction: column; align-items: center; justify-content: center; color: #FFF; text-align: center; padding: 40px; }
.sika-logo { font-size: 64px; letter-spacing: 12px; margin-bottom: 16px; font-weight: 700; }
.sika-sub { font-size: 11px; letter-spacing: 4px; opacity: 0.6; font-family: sans-serif; }
.product-card { border: 1px solid var(--color-border); padding: 48px 32px; background-color: var(--color-bg); transition: var(--transition-standard); }
.product-card:hover { border-color: var(--color-accent); box-shadow: 0 10px 30px rgba(15, 23, 42, 0.05); transform: translateY(-4px); }
.product-category { font-size: 10px; color: var(--color-accent); letter-spacing: 2px; text-transform: uppercase; margin-bottom: 16px; display: block; }
.product-title { font-size: 20px; color: var(--color-primary); margin-bottom: 16px; }
.product-card p { font-size: 14px; color: var(--color-text-muted); margin-bottom: 32px; }
.product-link { font-size: 12px; color: var(--color-primary); letter-spacing: 1px; font-weight: 500; text-transform: uppercase; border-bottom: 1px solid var(--color-primary); padding-bottom: 4px; }
.product-link:hover { color: var(--color-accent); border-color: var(--color-accent); }
.contact-wrapper { background-color: var(--color-primary); color: #FFF; padding: 80px; }
.contact-wrapper .section-title { color: #FFF; }
.contact-list { display: flex; flex-direction: column; gap: 32px; }
.contact-item { display: flex; flex-direction: column; gap: 8px; }
.contact-item-label { font-size: 11px; color: var(--color-accent); letter-spacing: 2px; text-transform: uppercase; }
.contact-item-value { font-size: 18px; font-weight: 300; letter-spacing: 1px; line-height: 1.6; }
.contact-item-value a { color: #FFF; }
.contact-item-value a:hover { color: var(--color-accent); }
.map-box { border: 1px solid rgba(255,255,255,0.2); height: 100%; min-height: 400px; display: flex; align-items: center; justify-content: center; background-color: rgba(255,255,255,0.02); }
.map-text { font-size: 13px; letter-spacing: 2px; color: rgba(255,255,255,0.5); text-transform: uppercase; }
footer { padding: 60px 0; background-color: #000000; color: rgba(255,255,255,0.4); font-size: 12px; letter-spacing: 1px; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; }
.footer-links { display: flex; gap: 32px; }
.footer-links a:hover { color: #FFF; }

/* ANIMATIONS */
.reveal { opacity: 0; transform: translateY(20px); transition: all 0.4s ease-out; }
.reveal.active { opacity: 1; transform: translateY(0); }
.delay-1 { transition-delay: 0.05s; }
.delay-2 { transition-delay: 0.1s; }
.delay-3 { transition-delay: 0.15s; }
.delay-4 { transition-delay: 0.2s; }

/* RESPONSIVE DESIGN (RWD) */
@media (max-width: 992px) {
  :root { --spacing-section: 80px; }
  .grid-2 { grid-template-columns: 1fr; gap: 60px; } 
  .grid-3 { grid-template-columns: 1fr 1fr; gap: 32px; } 
  .contact-wrapper { padding: 40px; } 
  .hero-title { font-size: 40px !important; } 
  .brand-content { padding-right: 0; }
  .brand-image-placeholder { min-height: 350px; }
}
@media (max-width: 768px) {
  :root { --spacing-section: 60px; }
  .container { padding: 0 20px; }
  .grid-3 { grid-template-columns: 1fr; } 
  
  /* Mobile Menu */
  .hamburger { display: flex; }
  .nav-links { 
    display: flex; 
    flex-direction: column; 
    position: fixed; 
    top: 80px; left: 0; right: 0; 
    background-color: #FFF; 
    border-bottom: 1px solid var(--color-border);
    padding: 20px; gap: 24px; 
    text-align: center;
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    opacity: 0; visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
  }
  .nav-links.active { opacity: 1; visibility: visible; transform: translateY(0); }
  
  /* Sections */
  .hero { padding-top: 60px; padding-bottom: 60px; }
  .hero-title { font-size: 32px !important; }
  .hero-desc { font-size: 15px; margin-bottom: 40px; }
  .hero-actions { flex-direction: column; gap: 16px; width: 100%; }
  .btn { width: 100%; }
  .section-title { font-size: 28px; }
  .product-card { padding: 32px 24px; }
  
  .footer-inner { flex-direction: column; gap: 24px; text-align: center; } 
  .footer-links { flex-wrap: wrap; justify-content: center; gap: 16px; }
}