/* ============================================
   Artscape Shanghai / 万博艺术
   Ultra-Minimal · Premium Dark
   ============================================ */

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

:root {
  --blk:     #080808;
  --blk2:    #0e0e0e;
  --blk3:    #141414;
  --blk4:    #1c1c1c;
  --border:  #222;
  --gold:    #c9a94e;
  --gold-dim: #7a6a3a;
  --text:    #ccc;
  --text2:   #999;
  --text3:   #666;
  --font-cn: 'Noto Serif SC', 'Source Han Serif SC', serif;
  --font-en: 'Cormorant Garamond', 'Georgia', serif;
  --font-ui: 'Inter', -apple-system, sans-serif;
  --max-w:   1100px;
  --nav-h:   64px;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font-ui);
  background: var(--blk);
  color: var(--text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* --- Nav --- */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(8,8,8,.88);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-w); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: var(--nav-h); padding: 0 32px;
}
.nav-logo { display: flex; align-items: center; text-decoration: none; margin: 0 40px 0 12px; }
.nav-logo-img { height: 50px; width: auto; display: block; flex-shrink: 0; }
.footer-logo-img { max-width: 100%; height: auto; display: block; }
.footer-logo { margin-bottom: 12px; }
.footer-logo .logo-cn { font-size: 20px; letter-spacing: 8px; }
.footer-logo .logo-en { font-size: 11px; }
.logo-cn { font-family: var(--font-cn); font-size: 17px; font-weight: 600; color: var(--gold); letter-spacing: 6px; }
.logo-en { font-family: var(--font-en); font-size: 10px; color: var(--gold-dim); letter-spacing: 4px; text-transform: uppercase; font-style: italic; }
.nav-links { display: flex; gap: 36px; }
.nav-links a {
  font-size: 12px; font-weight: 400; letter-spacing: 2px;
  text-transform: uppercase; color: var(--text2);
  transition: color .3s;
}
.nav-links a:hover { color: #eee; }
.nav-right { display: flex; align-items: center; gap: 20px; }
.lang-toggle {
  font-size: 12px; cursor: pointer; color: var(--text3); letter-spacing: 1px;
}
.lang-toggle .lang-active { color: var(--text); }
.lang-divider { margin: 0 4px; color: #333; }
.nav-hamburger {
  display: none; background: none; border: none; cursor: pointer;
  flex-direction: column; gap: 5px; padding: 4px;
}
.nav-hamburger span { display: block; width: 20px; height: 1.5px; background: var(--text); transition: all .3s; }

/* --- Hero --- */
.hero {
  position: relative; height: 100vh; min-height: 620px;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 30% 50%, #15100c, var(--blk) 70%);
  transition: opacity 1.5s;
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(8,8,8,.95) 100%);
}
.hero-content {
  position: relative; z-index: 2; text-align: center;
  max-width: 780px; padding: 0 32px;
}
.hero-badge {
  font-size: 11px; letter-spacing: 3px; text-transform: uppercase;
  color: var(--text3); margin-bottom: 40px;
}
.hero-title { margin-bottom: 28px; }
.hero-title-cn {
  display: block;
  font-family: var(--font-cn); font-size: clamp(34px, 5.5vw, 60px);
  font-weight: 400; color: #f0f0f0; letter-spacing: 10px;
  margin-bottom: 16px;
}
.hero-title-en {
  display: block;
  font-family: var(--font-en); font-size: clamp(18px, 2.5vw, 30px);
  font-weight: 300; font-style: italic; color: var(--text2);
  letter-spacing: 6px;
}
.hero-sub {
  font-size: 14px; color: var(--text3);
  max-width: 500px; margin: 0 auto 44px; line-height: 1.9;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 34px; font-size: 12px; letter-spacing: 2.5px;
  text-transform: uppercase; cursor: pointer; transition: all .4s;
  border: none; font-family: var(--font-ui);
}
.btn-primary { background: var(--gold); color: var(--blk); font-weight: 500; }
.btn-primary:hover { opacity: .85; }
.btn-outline {
  background: transparent; color: var(--text); border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--text3); }
.hero-scroll {
  position: absolute; bottom: 36px; left: 50%; transform: translateX(-50%);
  font-size: 10px; letter-spacing: 4px; text-transform: uppercase;
  color: var(--text3); z-index: 2;
  animation: scrollPulse 2.4s ease-in-out infinite;
}
@keyframes scrollPulse {
  0%, 100% { opacity: .3; transform: translateX(-50%) translateY(0); }
  50% { opacity: .6; transform: translateX(-50%) translateY(-5px); }
}

/* --- Sections --- */
.section { padding: 120px 32px; }
.section-blk { background: var(--blk); }
.section-blk2 { background: var(--blk2); }
.section-inner { max-width: var(--max-w); margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 72px; }
.section-label {
  display: block; font-size: 10px; letter-spacing: 4px;
  text-transform: uppercase; color: var(--text3);
  margin-bottom: 16px;
}
.section-title {
  font-family: var(--font-cn); font-size: clamp(26px, 3.5vw, 38px);
  color: #eee; letter-spacing: 5px; line-height: 1.55;
  font-weight: 400;
}

/* --- About --- */
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 80px;
  align-items: center;
}
.about-desc {
  font-size: 14px; color: var(--text2); margin-bottom: 20px;
  line-height: 2; max-width: 460px;
}
.about-visual { display: flex; flex-direction: column; gap: 20px; }
.about-image-frame {
  position: relative; aspect-ratio: 4/3; overflow: hidden;
}
.about-image-frame img { width: 100%; height: 100%; object-fit: cover; opacity: .85; }
.about-brands { display: flex; gap: 10px; }
.brand-tag {
  padding: 5px 14px; border: 1px solid var(--border);
  font-size: 10px; letter-spacing: 2.5px; text-transform: uppercase;
  color: var(--text3);
}
.about-text .btn { margin-top: 16px; }

/* --- Products Grid --- */
.products-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  background: var(--border);
}
.product-card {
  background: var(--blk2); padding: 56px 40px;
  transition: background .35s;
}
.product-card:hover { background: var(--blk3); }
.product-card-num {
  font-family: var(--font-en); font-size: 40px; font-weight: 300;
  color: rgba(255,255,255,.03); margin-bottom: 10px; line-height: 1;
}
.product-card-title {
  font-family: var(--font-cn); font-size: 18px; color: #eee;
  letter-spacing: 2px; margin-bottom: 10px; font-weight: 400;
}
.product-card-desc { font-size: 13px; color: var(--text2); line-height: 1.85; }
.section-footer-btn { text-align: center; margin-top: 52px; }

/* --- Clients --- */
.clients-grid {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 8px;
  max-width: 900px; margin: 0 auto;
}
.client-logo {
  padding: 14px 24px; border: 1px solid var(--border);
  font-family: var(--font-en); font-size: 13px; font-weight: 300;
  letter-spacing: 2px; color: var(--text2); transition: all .3s;
}
.client-logo:hover { border-color: #444; color: #ddd; }

/* --- Services --- */
.services-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 80px;
  align-items: center;
}
.services-image-frame { aspect-ratio: 4/5; overflow: hidden; }
.services-image-frame img { width: 100%; height: 100%; object-fit: cover; opacity: .85; }
.services-text .section-header { text-align: left; margin-bottom: 32px; }
.services-list { margin: 28px 0; }
.services-list li {
  padding: 14px 0; border-bottom: 1px solid #181818;
}
.services-list li:last-child { border-bottom: none; }
.services-list strong {
  font-family: var(--font-cn); font-size: 15px; color: #ddd;
  font-weight: 400; letter-spacing: 2px;
}
.services-list span { display: block; font-size: 13px; color: var(--text3); margin-top: 3px; }

/* --- CTA --- */
.cta-section {
  background: linear-gradient(135deg, #12100d, var(--blk) 50%, #0a0a0f 100%);
  text-align: center;
}
.cta-content { max-width: 560px; margin: 0 auto; }
.cta-title {
  font-family: var(--font-cn); font-size: clamp(26px, 3.5vw, 36px);
  color: #eee; letter-spacing: 5px; line-height: 1.6; margin-bottom: 20px;
  font-weight: 400;
}
.cta-desc { color: var(--text2); font-size: 14px; margin-bottom: 36px; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* --- Footer --- */
.footer {
  background: var(--blk); border-top: 1px solid var(--border);
  padding: 60px 32px 28px;
}
.footer-inner { max-width: var(--max-w); margin: 0 auto; }
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px; padding-bottom: 40px; border-bottom: 1px solid var(--border);
}
.footer-logo { margin-bottom: 10px; }
.footer-tagline { font-size: 12px; color: var(--text3); }
.footer-col h4 {
  font-size: 12px; color: #aaa; letter-spacing: 2px;
  margin-bottom: 16px; font-weight: 400;
}
.footer-col a, .footer-col p {
  display: block; font-size: 12px; color: var(--text3);
  margin-bottom: 6px; transition: color .3s;
}
.footer-col a:hover { color: var(--text); }
.footer-social { display: flex; gap: 12px; margin-top: 10px; }
.footer-social a {
  font-size: 11px; letter-spacing: 1px; text-transform: uppercase;
  border: 1px solid var(--border); padding: 3px 10px; color: var(--text3);
}
.footer-bottom {
  display: flex; justify-content: space-between;
  padding-top: 20px; font-size: 11px; color: #444;
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: var(--nav-h); left: 0; right: 0;
    background: rgba(8,8,8,.98); padding: 28px 32px;
    border-bottom: 1px solid var(--border); gap: 20px; align-items: center;
  }
  .nav-hamburger { display: flex; }
  .about-grid, .services-grid { grid-template-columns: 1fr; gap: 48px; }
  .products-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 600px) {
  .section { padding: 72px 24px; }
  .section-header { margin-bottom: 48px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 6px; text-align: center; }
  .clients-grid { gap: 6px; }
  .client-logo { font-size: 11px; padding: 10px 16px; }
  .product-card { padding: 36px 24px; }
}