/* ===== Tailwind CDN ===== */
@import url('https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css');

/* ===== Custom Properties ===== */
:root {
  --black: #0A0A0A;
  --silver: #C0C0C0;
  --blue: #0066FF;
  --blue-glow: rgba(0, 102, 255, 0.3);
  --dark-card: #111111;
  --dark-border: #1f1f1f;
  --text-muted: #888;
}

/* ===== Base ===== */
html { scroll-behavior: smooth; }
body {
  background: var(--black);
  color: #e0e0e0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x: hidden;
}
::selection { background: var(--blue); color: #fff; }

/* ===== Glass Navbar ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 16px 0;
  transition: all 0.35s ease;
}
.navbar.scrolled {
  background: rgba(10, 10, 10, 0.78);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding: 10px 0;
}
.navbar .logo {
  font-size: 22px; font-weight: 800; color: #fff;
  letter-spacing: 2px;
}
.navbar .logo span { color: var(--blue); }
.nav-link {
  color: #aaa; font-size: 14px; font-weight: 500;
  padding: 6px 0; position: relative; cursor: pointer;
  transition: color 0.25s;
}
.nav-link:hover { color: #fff; }
.nav-link::after {
  content: ''; position: absolute; bottom: 0; left: 0;
  width: 0; height: 2px; background: var(--blue);
  transition: width 0.3s ease;
}
.nav-link:hover::after { width: 100%; }

.mobile-menu { display: none; }
.mobile-menu.open { display: flex; }

/* ===== Hero ===== */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  position: relative; overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(0,102,255,0.08) 0%, transparent 70%),
    radial-gradient(ellipse 40% 50% at 80% 20%, rgba(192,192,192,0.04) 0%, transparent 70%),
    radial-gradient(ellipse 30% 40% at 20% 70%, rgba(0,102,255,0.05) 0%, transparent 70%);
}
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 70%);
}
.hero-content { position: relative; z-index: 2; }
.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem); font-weight: 900;
  line-height: 1.2; letter-spacing: 2px;
}
.hero-title .highlight {
  background: linear-gradient(135deg, var(--silver) 0%, #fff 40%, var(--blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  color: #999; font-size: clamp(1rem, 1.8vw, 1.2rem);
  max-width: 600px; line-height: 1.8;
}

/* ===== Section Common ===== */
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 800;
  letter-spacing: 1px; margin-bottom: 12px;
}
.section-sub {
  color: #777; font-size: 1rem; max-width: 560px;
  margin: 0 auto 60px; line-height: 1.7;
}

/* ===== Business Cards ===== */
.biz-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: 16px; padding: 36px 28px;
  transition: all 0.4s ease;
  position: relative; overflow: hidden;
  cursor: default;
}
.biz-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--blue), transparent);
  opacity: 0; transition: opacity 0.4s;
}
.biz-card:hover { transform: translateY(-8px); border-color: rgba(0,102,255,0.3); box-shadow: 0 20px 60px rgba(0,0,0,0.5), 0 0 30px rgba(0,102,255,0.06); }
.biz-card:hover::before { opacity: 1; }
.biz-icon {
  width: 52px; height: 52px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; margin-bottom: 20px;
  background: rgba(0,102,255,0.08); color: var(--blue);
}
.biz-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; color: #fff; }
.biz-card p { color: #888; font-size: 0.92rem; line-height: 1.7; }

/* ===== Stats ===== */
.stat-number {
  font-size: clamp(2rem, 4vw, 3rem); font-weight: 900;
  background: linear-gradient(180deg, #fff 0%, var(--silver) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { color: #777; font-size: 0.9rem; margin-top: 4px; }

/* ===== Case Cards ===== */
.case-card {
  background: var(--dark-card); border: 1px solid var(--dark-border);
  border-radius: 14px; overflow: hidden; transition: all 0.4s ease;
}
.case-card:hover { transform: translateY(-6px); border-color: rgba(0,102,255,0.25); box-shadow: 0 16px 48px rgba(0,0,0,0.5); }
.case-thumb {
  height: 180px; background: var(--dark-border);
  display: flex; align-items: center; justify-content: center;
  color: #555; font-size: 2.5rem;
}
.case-body { padding: 22px; }
.case-body h4 { font-weight: 700; font-size: 1.05rem; color: #fff; margin-bottom: 8px; }
.case-body p { color: #888; font-size: 0.88rem; line-height: 1.6; }
.case-tag {
  display: inline-block; padding: 3px 10px;
  font-size: 0.75rem; border-radius: 20px;
  background: rgba(0,102,255,0.1); color: var(--blue);
  margin-top: 10px;
}

/* ===== Contact ===== */
.contact-input {
  width: 100%; padding: 14px 16px;
  background: var(--dark-card); border: 1px solid var(--dark-border);
  border-radius: 10px; color: #e0e0e0; font-size: 0.95rem;
  outline: none; transition: border-color 0.3s;
}
.contact-input:focus { border-color: var(--blue); }
.contact-input::placeholder { color: #555; }
textarea.contact-input { resize: vertical; min-height: 120px; }

.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 32px; background: var(--blue);
  color: #fff; font-weight: 700; font-size: 0.95rem;
  border: none; border-radius: 10px; cursor: pointer;
  transition: all 0.3s; letter-spacing: 1px;
}
.btn-primary:hover { background: #0052cc; box-shadow: 0 8px 30px rgba(0,102,255,0.3); transform: translateY(-1px); }
.btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 32px; background: transparent;
  color: #fff; font-weight: 700; font-size: 0.95rem;
  border: 1px solid rgba(255,255,255,0.2); border-radius: 10px;
  cursor: pointer; transition: all 0.3s; letter-spacing: 1px;
}
.btn-outline:hover { border-color: var(--blue); background: rgba(0,102,255,0.06); }

/* ===== Footer ===== */
.footer-link {
  color: #777; font-size: 0.88rem; transition: color 0.25s; text-decoration: none;
}
.footer-link:hover { color: var(--blue); }

/* ===== Scroll Reveal ===== */
.reveal {
  opacity: 0; transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ===== Hamburger ===== */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.hamburger span {
  width: 22px; height: 2px; background: #fff;
  border-radius: 2px; transition: all 0.3s;
}
.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

@media (max-width: 768px) {
  .hamburger { display: flex; }
  .desktop-nav { display: none; }
  .mobile-menu {
    position: fixed; top: 64px; left: 0; right: 0; bottom: 0;
    background: rgba(10,10,10,0.96); backdrop-filter: blur(20px);
    flex-direction: column; align-items: center; justify-content: center;
    gap: 28px; z-index: 99;
  }
  .mobile-menu.open { display: flex; }
  .mobile-menu .nav-link { font-size: 18px; }
}