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

:root {
  --gold: #FFD700;
  --gold-light: #FFC107;
  --gold-dark: #D4A800;
  --gold-glow: rgba(255, 215, 0, 0.35);
  --blue: #03A9F4;
  --bg: #141418;
  --bg-card: #1F1F26;
  --bg-nav: rgba(20, 20, 24, 0.92);
  --white: #FFFFFF;
  --gray: #C8C8D0;
  --gray-dark: #4A4A54;
  --radius: 12px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; transition: color var(--transition); }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== HEADER ===== */
header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: var(--bg-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 215, 0, 0.08);
  transition: background var(--transition), box-shadow var(--transition);
}
header.scrolled { background: rgba(20, 20, 24, 0.96); box-shadow: 0 2px 32px rgba(0,0,0,0.4); }

nav { max-width: 1200px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; height: 72px; }

.logo-link { display: flex; align-items: center; height: 100%; padding: 6px 12px; border-radius: 8px; background: rgba(255, 255, 255, 0.06); }
.logo-link:hover { background: rgba(255, 255, 255, 0.1); }
.logo-img { height: 40px; width: auto; object-fit: contain; filter: drop-shadow(0 0 6px rgba(255, 215, 0, 0.25)); }

.nav-links { display: flex; gap: 36px; }
.nav-links a { position: relative; font-size: 15px; font-weight: 500; padding: 4px 0; }
.nav-links a::after {
  content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--gold-light));
  transition: width var(--transition); border-radius: 2px;
}
.nav-links a:hover { color: var(--gold); }
.nav-links a:hover::after { width: 100%; }

.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.hamburger span { width: 26px; height: 2px; background: var(--white); border-radius: 2px; transition: var(--transition); }

/* ===== HERO ===== */
.hero {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  text-align: center; position: relative; overflow: hidden;
  padding: 120px 24px 80px;
}
.hero-bg {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 40%, rgba(255, 215, 0, 0.12) 0%, transparent 70%),
              radial-gradient(circle at 20% 80%, rgba(3, 169, 244, 0.08) 0%, transparent 50%),
              radial-gradient(circle at 80% 20%, rgba(255, 193, 7, 0.06) 0%, transparent 40%);
  z-index: 0;
}
.hero-bg::before {
  content: ''; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255, 215, 0, 0.1) 1px, transparent 1px);
  background-size: 40px 40px; opacity: 0.3;
  z-index: -1;
}
.hero-canvas {
  position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0;
  pointer-events: none;
}
.hero-content { position: relative; z-index: 2; max-width: 800px; }

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.2rem); font-weight: 800; line-height: 1.2; margin-bottom: 20px;
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.4);
}
.hero-title span {
  background: linear-gradient(135deg, var(--gold), var(--gold-light), var(--blue));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}

.hero-subtitle { font-size: clamp(1rem, 2.5vw, 1.25rem); color: #D8D8E0; margin-bottom: 44px; max-width: 600px; margin-left: auto; margin-right: auto; }

.cta-button {
  display: inline-block; padding: 16px 48px;
  background: linear-gradient(135deg, var(--gold), var(--gold-light));
  color: var(--bg); font-size: 16px; font-weight: 700; border-radius: 50px;
  box-shadow: 0 4px 24px var(--gold-glow); transition: all var(--transition);
  position: relative; overflow: hidden;
}
.cta-button:hover { transform: translateY(-2px); box-shadow: 0 8px 36px var(--gold-glow); }
.cta-button::after {
  content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, transparent 30%, rgba(255,255,255,0.3));
  transform: translateX(-100%); transition: transform 0.6s;
}
.cta-button:hover::after { transform: translateX(100%); }

/* ===== SECTION COMMON ===== */
section { padding: 100px 0; }
.section-title { text-align: center; margin-bottom: 64px; }
.section-title h2 { font-size: clamp(1.8rem, 4vw, 2.4rem); font-weight: 700; }
.title-line { width: 64px; height: 3px; background: linear-gradient(90deg, var(--gold), var(--blue)); margin: 12px auto 0; border-radius: 3px; }

/* ===== ABOUT ===== */
.about { background: var(--bg-card); }
.about-content { text-align: center; max-width: 760px; margin: 0 auto; font-size: 1.125rem; color: var(--gray); line-height: 1.8; }
.about-address { margin-top: 12px; color: var(--gold-light); font-size: 1rem; }
.about-address::before { content: '📍 '; }

/* ===== SERVICES ===== */
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.service-card { background: var(--bg-card); border: 1px solid var(--gray-dark); border-radius: var(--radius); padding: 40px 28px; text-align: center; transition: all var(--transition); position: relative; overflow: hidden; }
.service-card::before {
  content: ''; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: 60%; height: 2px; background: linear-gradient(90deg, transparent, var(--gold), transparent);
  opacity: 0; transition: opacity var(--transition);
}
.service-card:hover { transform: translateY(-6px); border-color: var(--gold-dark); box-shadow: 0 12px 40px rgba(255, 215, 0, 0.1); }
.service-card:hover::before { opacity: 1; }

.icon-wrap { width: 64px; height: 64px; margin: 0 auto 20px; display: flex; align-items: center; justify-content: center; color: var(--gold); }
.icon-wrap svg { width: 100%; height: 100%; }

.service-card h3 { font-size: 1.25rem; margin-bottom: 12px; color: var(--white); }
.service-card p { color: var(--gray); font-size: 0.95rem; line-height: 1.7; }

/* ===== CASES ===== */
.cases { background: var(--bg-card); }
.cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.case-card { background: var(--bg); border: 1px solid var(--gray-dark); border-radius: var(--radius); padding: 48px 32px; text-align: center; transition: all var(--transition); }
.case-card:hover { border-color: var(--blue); box-shadow: 0 8px 32px rgba(3, 169, 244, 0.1); }

.case-stat { font-size: 3rem; font-weight: 800; background: linear-gradient(135deg, var(--gold), var(--gold-light)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; margin-bottom: 16px; }
.case-card h3 { font-size: 1.15rem; margin-bottom: 14px; }
.case-card p { color: var(--gray); font-size: 0.95rem; line-height: 1.7; }

/* ===== CONTACT ===== */
.contact-intro { text-align: center; color: var(--gray); max-width: 560px; margin: 0 auto 44px; font-size: 1.05rem; }

.contact-form { max-width: 540px; margin: 0 auto; display: flex; flex-direction: column; gap: 20px; }
.form-group input, .form-group textarea {
  width: 100%; padding: 16px 20px; background: var(--bg); border: 1px solid var(--gray-dark);
  border-radius: 10px; color: var(--white); font-size: 15px;
  font-family: inherit; transition: border-color var(--transition), box-shadow var(--transition);
}
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--gray); }
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--gold); box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.12); }
.form-group textarea { resize: vertical; min-height: 120px; }

.submit-btn {
  padding: 16px; background: linear-gradient(135deg, var(--gold), var(--gold-light));
  color: var(--bg); font-size: 16px; font-weight: 700; border: none; border-radius: 50px;
  cursor: pointer; transition: all var(--transition);
  box-shadow: 0 4px 20px var(--gold-glow);
}
.submit-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 32px var(--gold-glow); }

/* ===== FOOTER ===== */
footer { padding: 48px 0 32px; border-top: 1px solid var(--gray-dark); text-align: center; }
.footer-logo { margin-bottom: 8px; display: inline-flex; padding: 4px 10px; border-radius: 6px; background: rgba(255, 255, 255, 0.06); }
.footer-logo-img { height: 32px; width: auto; object-fit: contain; filter: drop-shadow(0 0 4px rgba(255, 215, 0, 0.2)); }
.footer-desc { color: var(--gray); font-size: 0.95rem; margin-bottom: 24px; }
.footer-links { display: flex; justify-content: center; gap: 32px; margin-bottom: 24px; }
.footer-links a { color: var(--gray); font-size: 14px; }
.footer-links a:hover { color: var(--gold); }
.copyright { color: var(--gray-dark); font-size: 13px; margin-bottom: 10px; }
.beian { font-size: 12px; color: var(--gray-dark); }
.beian a { color: var(--gray-dark); transition: color var(--transition); }
.beian a:hover { color: var(--gold); }
.beian span { margin: 0 6px; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .services-grid, .cases-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed; top: 72px; right: -100%; width: 260px; height: calc(100vh - 72px);
    background: var(--bg-card); flex-direction: column; gap: 0;
    padding: 24px 0; transition: right var(--transition);
    border-left: 1px solid var(--gray-dark);
  }
  .nav-links.active { right: 0; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: 16px 32px; font-size: 16px; }
  .nav-links a::after { display: none; }
  .hamburger { display: flex; }
  .hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .hamburger.active span:nth-child(2) { opacity: 0; }
  .hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

  .services-grid, .cases-grid { grid-template-columns: 1fr; max-width: 520px; margin-left: auto; margin-right: auto; }
  section { padding: 72px 0; }
  .hero { padding: 100px 20px 60px; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 2rem; }
  .hero-subtitle { font-size: 1rem; }
  .cta-button { padding: 14px 36px; font-size: 14px; }
  .service-card, .case-card { padding: 32px 20px; }
  .contact-form { padding: 0 4px; }
}