/* ============================================
   Home Page - Tech Blue Style v2
   ============================================ */
*, *::before, *::after { box-sizing: border-box; }
body, ul, h1, h2, h3, h4, h5, h6, p { margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Microsoft YaHei", sans-serif; font-size: 16px; line-height: 1.6; color: #1a2332; background: #fff; -webkit-font-smoothing: antialiased; }
a { color: #0066ff; text-decoration: none; transition: color .2s; }
a:hover { color: #3388ff; }
ul { list-style: none; }
img { max-width: 100%; height: auto; border: 0; vertical-align: middle; }

/* ========== Navigation ========== */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: #0d2137;
  box-shadow: 0 2px 12px rgba(0,0,0,.15);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px; height: 72px;
  display: flex; align-items: center;
  position: relative;
}
.nav-logo { margin-right: 48px; flex-shrink: 0; }
.nav-logo img { height: 36px; }
.nav-links { display: flex; align-items: center; gap: 4px; flex: 1; }
.nav-links a {
  color: rgba(255,255,255,.85); font-size: 15px;
  padding: 8px 16px; border-radius: 6px; transition: all .2s;
}
.nav-links a:hover, .nav-links a.active { color: #fff; background: rgba(255,255,255,.1); }
.nav-actions { display: flex; align-items: center; gap: 16px; flex-shrink: 0; }
.nav-btn-loginreg {
  color: rgba(255,255,255,.85); font-size: 14px;
  padding: 6px 18px; border: 1px solid rgba(255,255,255,.3);
  border-radius: 6px; transition: all .2s; cursor: pointer;
}
.nav-btn-loginreg:hover { color: #fff; border-color: rgba(255,255,255,.6); background: rgba(255,255,255,.08); }
.nav-lang {
  color: rgba(255,255,255,.55); font-size: 13px; font-weight: 500;
  padding: 4px 0; transition: all .2s; margin-left: 4px;
}
.nav-lang:hover { color: #fff; }
.nav-toggle { display: none; background: none; border: none; color: #fff; font-size: 28px; cursor: pointer; padding: 4px; margin-left: auto; }

/* ========== Hero ========== */
.hero {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #0d2137 0%, #1a3a5c 40%, #0066ff 100%);
  padding: 100px 24px 80px; overflow: hidden; position: relative;
}
.hero::before {
  content: ''; position: absolute; top: -40%; right: -15%;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(0,102,255,.12) 0%, transparent 70%);
  pointer-events: none; border-radius: 50%;
}
.hero::after {
  content: ''; position: absolute; bottom: -25%; left: -10%;
  width: 350px; height: 350px;
  background: radial-gradient(circle, rgba(255,255,255,.05) 0%, transparent 70%);
  pointer-events: none; border-radius: 50%;
}
.hero-content { position: relative; z-index: 1; text-align: center; max-width: 800px; }
.hero-title {
  font-size: 48px; font-weight: 800; color: #fff;
  margin-bottom: 16px; letter-spacing: -0.5px;
}
.hero-subtitle {
  font-size: 20px; font-weight: 500; color: rgba(255,255,255,.9); margin-bottom: 12px;
}
.hero-desc {
  font-size: 16px; line-height: 1.8; color: rgba(255,255,255,.7);
  margin-bottom: 40px; max-width: 600px; margin-left: auto; margin-right: auto;
}
.hero-cta {
  display: inline-block; padding: 16px 48px; font-size: 18px; font-weight: 600;
  color: #0066ff; background: #fff; border: none; border-radius: 50px;
  cursor: pointer; transition: all .3s ease;
  box-shadow: 0 4px 20px rgba(0,0,0,.15);
}
.hero-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,0,0,.25); }

/* ========== Features ========== */
.features { padding: 100px 24px; background: #f0f4f8; }
.features-header { text-align: center; margin-bottom: 64px; }
.features-en {
  font-size: 14px; font-weight: 600; color: #0066ff;
  text-transform: uppercase; letter-spacing: 3px; margin-bottom: 8px;
}
.features-title { font-size: 36px; font-weight: 700; color: #1a2332; margin-bottom: 12px; }
.features-sub { font-size: 18px; color: #5a6a7a; }
.features-grid {
  max-width: 1100px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.feature-card {
  background: #fff; border-radius: 12px; padding: 40px 28px; text-align: center;
  box-shadow: 0 2px 12px rgba(0,0,0,.06); transition: all .3s ease;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: 0 12px 40px rgba(0,0,0,.1); }
.feature-icon {
  width: 64px; height: 64px; margin: 0 auto 20px;
  background: #e8f0fe; border-radius: 16px;
  display: flex; align-items: center; justify-content: center; font-size: 28px;
}
.feature-card-title { font-size: 18px; font-weight: 600; color: #1a2332; margin-bottom: 10px; }
.feature-card-desc { font-size: 14px; line-height: 1.7; color: #5a6a7a; }

/* ========== Partners ========== */
.partners { padding: 100px 24px; background: #fff; }
.partners-header { text-align: center; margin-bottom: 56px; }
.partners-en {
  font-size: 14px; font-weight: 600; color: #0066ff;
  text-transform: uppercase; letter-spacing: 3px; margin-bottom: 8px;
}
.partners-title { font-size: 36px; font-weight: 700; color: #1a2332; margin-bottom: 12px; }
.partners-sub { font-size: 18px; color: #5a6a7a; }
.partners-grid {
  max-width: 1000px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; align-items: center;
}
.partners-grid img {
  width: 100%; padding: 16px; opacity: .5;
  transition: all .3s; filter: grayscale(1);
}
.partners-grid img:hover { opacity: 1; filter: grayscale(0); }

/* ========== Steps ========== */
.steps-section { padding: 100px 24px; background: #f0f4f8; text-align: center; }
.steps-header { margin-bottom: 56px; }
.steps-en {
  font-size: 14px; font-weight: 600; color: #0066ff;
  text-transform: uppercase; letter-spacing: 3px; margin-bottom: 8px;
}
.steps-title { font-size: 36px; font-weight: 700; color: #1a2332; margin-bottom: 12px; }
.steps-sub { font-size: 18px; color: #5a6a7a; }
.steps-grid {
  display: flex; justify-content: center; align-items: flex-start; gap: 0;
  max-width: 900px; margin: 0 auto 48px;
}
.step-card { flex: 1; max-width: 260px; padding: 0 16px; position: relative; }
.step-num {
  width: 56px; height: 56px; margin: 0 auto 16px;
  background: #0066ff; color: #fff; font-size: 22px; font-weight: 700;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
}
.step-card h3 { font-size: 18px; font-weight: 600; color: #1a2332; margin-bottom: 8px; }
.step-card p { font-size: 14px; line-height: 1.6; color: #5a6a7a; }
.step-arrow {
  display: flex; align-items: center; padding-top: 28px; color: #ccc; font-size: 24px;
}
.steps-cta {
  display: inline-block; padding: 14px 40px;
  font-size: 16px; font-weight: 600; color: #fff;
  background: #0066ff; border-radius: 50px; transition: all .2s;
}
.steps-cta:hover { background: #3388ff; transform: translateY(-2px); }

/* ========== Footer ========== */
.site-footer { background: #0d2137; padding: 48px 24px 32px; text-align: center; }
.footer-links {
  display: flex; justify-content: center; gap: 24px; margin-bottom: 24px; flex-wrap: wrap;
}
.footer-links a { color: rgba(255,255,255,.6); font-size: 14px; transition: color .2s; }
.footer-links a:hover { color: #fff; }
.footer-copy { color: rgba(255,255,255,.4); font-size: 13px; }

/* ========== Modal ========== */
.modal-overlay {
  display: none; position: fixed; inset: 0; z-index: 9999;
  background: rgba(0,0,0,.55); align-items: center; justify-content: center;
}
.modal-overlay.show { display: flex; }
.modal-box {
  background: #fff; border-radius: 16px; padding: 48px 40px 36px;
  max-width: 420px; width: 90%; text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,.3);
  position: relative; animation: modalIn .3s ease;
}
@keyframes modalIn {
  from { opacity: 0; transform: scale(.92) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
.modal-icon { font-size: 48px; margin-bottom: 16px; }
.modal-box h3 { font-size: 20px; font-weight: 700; color: #1a2332; margin-bottom: 12px; }
.modal-box p { font-size: 15px; line-height: 1.7; color: #5a6a7a; margin-bottom: 4px; }
.modal-contact { font-size: 16px; font-weight: 600; color: #0066ff; margin: 20px 0 28px; }
.modal-close {
  display: inline-block; padding: 10px 36px; font-size: 14px; font-weight: 600;
  color: #fff; background: #0d2137; border: none; border-radius: 50px; cursor: pointer;
  transition: all .2s;
}
.modal-close:hover { background: #1a3a5c; }

/* ========== Mobile ========== */
@media (max-width: 900px) {
  .nav-links, .nav-actions { display: none; }
  .nav-toggle { display: block; }
  .nav-inner.open { height: auto; flex-wrap: wrap; padding-bottom: 16px; }
  .nav-inner.open .nav-links,
  .nav-inner.open .nav-actions { display: flex; width: 100%; }
  .nav-inner.open .nav-links { flex-direction: column; gap: 2px; margin-top: 12px; }
  .nav-inner.open .nav-links a { display: block; }
  .nav-inner.open .nav-actions { gap: 12px; margin-top: 12px; padding-top: 12px; border-top: 1px solid rgba(255,255,255,.08); }
  .nav-inner.open .nav-btn-loginreg { width: 100%; text-align: center; }
  .hero-title { font-size: 32px; }
  .hero-subtitle { font-size: 16px; }
  .hero-desc { font-size: 14px; }
  .hero-cta { padding: 14px 36px; font-size: 16px; }
  .features { padding: 64px 20px; }
  .features-title { font-size: 28px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .feature-card { padding: 28px 20px; }
  .partners { padding: 64px 20px; }
  .partners-title { font-size: 28px; }
  .partners-grid { grid-template-columns: repeat(3, 1fr); }
  .steps-grid { flex-direction: column; align-items: center; gap: 24px; }
  .step-arrow { display: none; }
  .step-card { max-width: 100%; }
  .steps-title { font-size: 28px; }
}
@media (max-width: 600px) {
  .features-grid { grid-template-columns: 1fr; }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-title { font-size: 26px; }
  .hero-subtitle { font-size: 15px; }
  .hero-cta { padding: 12px 28px; font-size: 15px; }
}