/* ===== CSS Variables ===== */
:root {
  --primary: #0052D9;
  --primary-dark: #003DA5;
  --primary-light: #4D8BFF;
  --primary-bg: #F0F5FF;
  --accent: #00C9A7;
  --dark: #0A1628;
  --dark-2: #1A2744;
  --gray-900: #1D2939;
  --gray-700: #344054;
  --gray-500: #667085;
  --gray-300: #D0D5DD;
  --gray-100: #F2F4F7;
  --white: #FFFFFF;
  --gradient-hero: linear-gradient(135deg, #0A1628 0%, #0D2B5E 50%, #0052D9 100%);
  --gradient-btn: linear-gradient(135deg, #0052D9 0%, #4D8BFF 100%);
  --gradient-card: linear-gradient(180deg, #FFFFFF 0%, #F0F5FF 100%);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 20px rgba(0,82,217,0.1);
  --shadow-lg: 0 8px 40px rgba(0,82,217,0.15);
  --shadow-card: 0 2px 16px rgba(0,0,0,0.06);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  color: var(--gray-700);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; transition: 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; width: 100%; z-index: 1000;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0,82,217,0.06);
  transition: var(--transition);
}
.header.scrolled { box-shadow: var(--shadow-sm); }
.header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.25rem; color: var(--primary); }
.logo img { height: 36px; }
.logo span { background: var(--gradient-btn); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.nav { display: flex; align-items: center; gap: 32px; }
.nav a {
  font-size: 0.9rem; font-weight: 500; color: var(--gray-700);
  position: relative; padding: 4px 0;
}
.nav a::after {
  content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px;
  background: var(--primary); border-radius: 1px; transition: var(--transition);
}
.nav a:hover { color: var(--primary); }
.nav a:hover::after { width: 100%; }
.nav-dropdown { position: relative; }
.nav-dropdown .dropdown-menu {
  position: absolute; top: 100%; left: 50%; transform: translateX(-50%) translateY(8px);
  background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow-lg);
  padding: 12px 0; min-width: 200px; opacity: 0; visibility: hidden;
  transition: var(--transition);
}
.nav-dropdown:hover .dropdown-menu { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.dropdown-menu a { display: block; padding: 10px 20px; font-size: 0.85rem; }
.dropdown-menu a:hover { background: var(--primary-bg); color: var(--primary); }
.header-actions { display: flex; align-items: center; gap: 12px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 24px; border-radius: 8px; font-size: 0.9rem; font-weight: 600;
  cursor: pointer; border: none; transition: var(--transition);
}
.btn-primary {
  background: var(--gradient-btn); color: var(--white);
  box-shadow: 0 2px 12px rgba(0,82,217,0.3);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 4px 20px rgba(0,82,217,0.4); }
.btn-outline {
  background: transparent; color: var(--primary);
  border: 1.5px solid var(--primary);
}
.btn-outline:hover { background: var(--primary); color: var(--white); }
.btn-white { background: var(--white); color: var(--primary); font-weight: 600; }
.btn-white:hover { transform: translateY(-1px); box-shadow: var(--shadow-lg); }
.btn-lg { padding: 14px 36px; font-size: 1rem; border-radius: 10px; }

/* ===== Mobile Menu ===== */
.menu-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.menu-toggle span { display: block; width: 22px; height: 2px; background: var(--gray-700); margin: 5px 0; transition: var(--transition); border-radius: 2px; }

/* ===== Hero ===== */
.hero {
  background: var(--gradient-hero);
  padding: 140px 0 80px;
  position: relative; overflow: hidden;
  min-height: 560px; display: flex; align-items: center;
}
.hero::before {
  content: ''; position: absolute; top: -40%; right: -15%;
  width: 700px; height: 700px;
  background: radial-gradient(circle, rgba(77,139,255,0.18) 0%, transparent 70%);
  border-radius: 50%; pointer-events: none;
}
.hero::after {
  content: ''; position: absolute; bottom: -30%; left: -10%;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(0,201,167,0.1) 0%, transparent 70%);
  border-radius: 50%; pointer-events: none;
}
.hero .container {
  position: relative; z-index: 1;
  display: flex; flex-direction: column; align-items: center;
  text-align: center;
}
.hero-content { width: 100%; max-width: 780px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.15);
  padding: 6px 18px; border-radius: 50px; font-size: 0.82rem; color: rgba(255,255,255,0.85);
  margin-bottom: 28px; backdrop-filter: blur(10px);
}
.hero-badge .dot { width: 6px; height: 6px; background: var(--accent); border-radius: 50%; animation: pulse 2s infinite; flex-shrink: 0; }
.hero h1 {
  font-size: 3.4rem; font-weight: 800; color: var(--white);
  line-height: 1.2; margin-bottom: 24px;
  letter-spacing: -0.02em;
}
.hero h1 .highlight {
  background: linear-gradient(135deg, #4D8BFF, #00C9A7);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero p {
  font-size: 1.1rem; color: rgba(255,255,255,0.7);
  margin: 0 auto 36px; max-width: 580px; line-height: 1.85;
}
.hero-buttons {
  display: flex; gap: 16px; flex-wrap: wrap;
  justify-content: center; margin-bottom: 0;
}
.hero-visual { display: none; }
.hero-stats {
  display: flex; gap: 0; margin-top: 56px; padding-top: 36px;
  border-top: 1px solid rgba(255,255,255,0.1);
  width: 100%; max-width: 600px;
  justify-content: space-around;
}
.hero-stat { text-align: center; }
.hero-stat .number { font-size: 2rem; font-weight: 800; color: var(--white); line-height: 1; }
.hero-stat .label { font-size: 0.78rem; color: rgba(255,255,255,0.5); margin-top: 6px; }

/* ===== Section Common ===== */
.section { padding: 100px 0; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.8rem; font-weight: 600; color: var(--primary);
  background: var(--primary-bg); padding: 6px 16px; border-radius: 50px;
  margin-bottom: 16px; text-transform: uppercase; letter-spacing: 0.05em;
}
.section-title {
  font-size: 2.4rem; font-weight: 800; color: var(--dark);
  line-height: 1.3; margin-bottom: 16px; letter-spacing: -0.02em;
}
.section-desc { font-size: 1.05rem; color: var(--gray-500); max-width: 600px; margin: 0 auto; line-height: 1.7; }
.section-alt { background: var(--gray-100); }

/* ===== Products ===== */
.products-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.product-card {
  background: var(--white); border-radius: var(--radius-lg); padding: 36px 28px;
  border: 1px solid var(--gray-100); transition: var(--transition);
  position: relative; overflow: hidden;
}
.product-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--gradient-btn); opacity: 0; transition: var(--transition);
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }
.product-card:hover::before { opacity: 1; }
.product-card.featured { border-color: var(--primary); }
.product-card.featured::before { opacity: 1; }
.product-badge {
  position: absolute; top: 16px; right: 16px;
  background: var(--gradient-btn); color: var(--white);
  font-size: 0.7rem; font-weight: 600; padding: 4px 10px; border-radius: 50px;
}
.product-icon {
  width: 56px; height: 56px; border-radius: 14px;
  background: var(--primary-bg); display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
}
.product-icon svg { width: 28px; height: 28px; color: var(--primary); }
.product-card h3 { font-size: 1.2rem; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
.product-card .price { font-size: 0.85rem; color: var(--gray-500); margin-bottom: 16px; }
.product-card .price strong { font-size: 1.6rem; color: var(--primary); font-weight: 800; }
.product-features { margin-bottom: 24px; }
.product-features li {
  font-size: 0.85rem; color: var(--gray-500); padding: 6px 0;
  display: flex; align-items: center; gap: 8px;
}
.product-features li::before {
  content: '✓'; color: var(--accent); font-weight: 700; font-size: 0.8rem;
}

/* ===== Features / Why Choose ===== */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.feature-card {
  background: var(--white); border-radius: var(--radius-lg); padding: 40px 32px;
  border: 1px solid var(--gray-100); transition: var(--transition);
  text-align: center;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.feature-icon {
  width: 64px; height: 64px; border-radius: 16px;
  background: var(--primary-bg); display: flex; align-items: center; justify-content: center;
  margin: 0 auto 20px;
}
.feature-icon svg { width: 30px; height: 30px; color: var(--primary); }
.feature-card h3 { font-size: 1.1rem; font-weight: 700; color: var(--dark); margin-bottom: 10px; }
.feature-card p { font-size: 0.9rem; color: var(--gray-500); line-height: 1.7; }

/* ===== Steps ===== */
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; position: relative; }
.steps-grid::before {
  content: ''; position: absolute; top: 44px; left: 15%; right: 15%;
  height: 2px; background: var(--gray-300); z-index: 0;
}
.step-card { text-align: center; position: relative; z-index: 1; }
.step-number {
  width: 88px; height: 88px; border-radius: 50%;
  background: var(--gradient-btn); color: var(--white);
  font-size: 2rem; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 24px;
  box-shadow: 0 4px 24px rgba(0,82,217,0.3);
}
.step-card h3 { font-size: 1.15rem; font-weight: 700; color: var(--dark); margin-bottom: 10px; }
.step-card p { font-size: 0.9rem; color: var(--gray-500); line-height: 1.7; }

/* ===== Brands / Partners ===== */
.brands-row {
  display: flex; align-items: center; justify-content: center;
  gap: 48px; flex-wrap: wrap; padding: 20px 0;
}
.brands-row img { height: 40px; opacity: 0.5; filter: grayscale(100%); transition: var(--transition); }
.brands-row img:hover { opacity: 1; filter: grayscale(0%); }

/* ===== CTA ===== */
.cta-section {
  background: var(--gradient-hero); padding: 80px 0;
  text-align: center; position: relative; overflow: hidden;
}
.cta-section::before {
  content: ''; position: absolute; top: -50%; right: -20%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(77,139,255,0.2) 0%, transparent 70%);
  border-radius: 50%;
}
.cta-section h2 { font-size: 2.2rem; font-weight: 800; color: var(--white); margin-bottom: 16px; }
.cta-section p { font-size: 1.05rem; color: rgba(255,255,255,0.7); margin-bottom: 36px; max-width: 500px; margin-left: auto; margin-right: auto; }
.cta-buttons { display: flex; gap: 16px; justify-content: center; position: relative; z-index: 1; }

/* ===== Footer ===== */
.footer { background: var(--dark); padding: 80px 0 0; color: rgba(255,255,255,0.6); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand p { font-size: 0.9rem; line-height: 1.8; margin-top: 16px; max-width: 300px; }
.footer-brand .logo { margin-bottom: 8px; }
.footer h4 { font-size: 0.9rem; font-weight: 700; color: var(--white); margin-bottom: 20px; text-transform: uppercase; letter-spacing: 0.05em; }
.footer ul li { margin-bottom: 12px; }
.footer ul a { font-size: 0.85rem; color: rgba(255,255,255,0.5); }
.footer ul a:hover { color: var(--white); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 24px 0; display: flex; align-items: center; justify-content: space-between;
  font-size: 0.8rem;
}
.footer-social { display: flex; gap: 16px; }
.footer-social a {
  width: 36px; height: 36px; border-radius: 50%;
  background: rgba(255,255,255,0.08); display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
}
.footer-social a:hover { background: var(--primary); }
.footer-social svg { width: 16px; height: 16px; fill: rgba(255,255,255,0.6); }

/* ===== Animations ===== */
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.animate.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 2.6rem; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .nav, .header-actions { display: none; }
  .menu-toggle { display: block; }
  .hero { padding: 110px 0 56px; min-height: auto; }
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 0.95rem; }
  .hero-stats { gap: 0; margin-top: 36px; padding-top: 24px; }
  .hero-stat .number { font-size: 1.4rem; }
  .section { padding: 60px 0; }
  .section-title { font-size: 1.8rem; }
  .features-grid, .steps-grid { grid-template-columns: 1fr; }
  .products-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .cta-section h2 { font-size: 1.6rem; }
  .cta-buttons { flex-direction: column; align-items: center; }
  .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
}

/* ===== News Grid 4-col (homepage) ===== */
.news-grid-4 { grid-template-columns: repeat(4, 1fr); gap: 20px; }
.news-card-sm .news-card-img img { height: 140px; }
.news-card-sm .news-card-content { padding: 16px; }
.news-card-sm .news-card-content h3 { font-size: 0.88rem; margin: 8px 0 8px; line-height: 1.4; }
.news-card-sm .news-card-content p { font-size: 0.78rem; line-height: 1.6; margin-bottom: 12px; -webkit-line-clamp: 3; display: -webkit-box; -webkit-box-orient: vertical; overflow: hidden; }
.news-card-sm .news-meta { margin-bottom: 4px; }
.news-card-sm .news-tag { font-size: 0.7rem; padding: 2px 8px; }
.news-card-sm .news-date { font-size: 0.72rem; }
.news-card-sm .news-link { font-size: 0.78rem; }

@media (max-width: 1024px) { .news-grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .news-grid-4 { grid-template-columns: 1fr; } }

/* ===== News Card Base (homepage) ===== */
.news-grid { display: grid; gap: 28px; }
.news-card {
  background: var(--white); border-radius: var(--radius-lg, 16px); overflow: hidden;
  border: 1px solid var(--gray-100, #f0f0f0); transition: all .3s;
}
.news-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.1); }
.news-card-img img { width: 100%; height: 180px; object-fit: cover; display: block; }
.news-card-content { padding: 24px; }
.news-card-content h3 { font-size: 1rem; font-weight: 700; color: var(--dark, #0A1628); margin: 10px 0; line-height: 1.4; }
.news-card-content p { font-size: 0.85rem; color: var(--gray-500, #6b7280); line-height: 1.7; margin-bottom: 16px; }
.news-meta { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.news-tag { background: rgba(0,82,217,0.08); color: var(--primary, #0052D9); font-size: 0.75rem; font-weight: 600; padding: 3px 12px; border-radius: 50px; }
.news-date { font-size: 0.82rem; color: var(--gray-500, #6b7280); }
.news-link { font-size: 0.85rem; color: var(--primary, #0052D9); font-weight: 600; text-decoration: none; }
.news-link:hover { text-decoration: underline; }

/* ===== Logo Subtitle ===== */
.logo .logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.logo-sub { font-size: 0.55rem; color: var(--gray-500, #6b7280); font-weight: 400; letter-spacing: 0.5px; margin-top: 2px; }
.header.scrolled .logo-sub { color: var(--gray-400, #9ca3af); }