:root {
  --blue: #0066cc;
  --blue-strong: #0071e3;
  --blue-soft: #eaf3ff;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --canvas: #ffffff;
  --parchment: #f5f5f7;
  --surface: #fafafc;
  --line: #e0e0e0;
  --success: #34c759;
  --shadow: 0 24px 80px rgba(0,0,0,.15);
  --shadow-sm: 0 8px 30px rgba(0,0,0,.08);
  --ease: cubic-bezier(.2,.8,.2,1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  min-height: 100%;
  background:
    radial-gradient(circle at 15% 0%, rgba(0,102,204,.07), transparent 26%),
    radial-gradient(circle at 92% 100%, rgba(52,199,89,.05), transparent 24%),
    var(--parchment);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.5;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

/* Bilingual Support */
body.lang-zh .en { display: none !important; }
body.lang-en .zh { display: none !important; }

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255,255,255,.72);
  backdrop-filter: saturate(160%) blur(20px);
  border-bottom: 1px solid rgba(224,224,224,.64);
  padding: 16px 0;
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--blue);
}

.brand-logo {
  width: 28px;
  height: 28px;
}

.brand-text {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--ink);
}

.nav-links {
  display: flex;
  gap: 24px;
  align-items: center;
}

.nav-links a {
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--ink);
}

.lang-switcher button {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  cursor: pointer;
  transition: all 0.2s var(--ease);
}

.lang-switcher button:hover {
  background: var(--blue-soft);
  color: var(--blue);
  border-color: rgba(0,102,204,.18);
}

/* Hero Section */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 140px 24px 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 60px;
}

.hero-content {
  max-width: 800px;
  animation: fade-up 0.8s var(--ease);
}

.hero-title {
  font-size: 56px;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.03em;
  margin-bottom: 24px;
}

.text-gradient {
  background: linear-gradient(135deg, var(--blue) 0%, #2485e7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 20px;
  color: var(--muted);
  margin-bottom: 40px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 24px;
  min-height: 52px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 120ms var(--ease), background 120ms var(--ease), box-shadow 120ms var(--ease);
}

.btn svg {
  width: 20px;
  height: 20px;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--blue);
  color: white;
}

.btn-primary:hover {
  background: var(--blue-strong);
  box-shadow: 0 8px 24px rgba(0,102,204,.25);
}

.btn-secondary {
  background: white;
  color: var(--ink);
  border: 1px solid var(--line);
}

.btn-secondary:hover {
  background: var(--surface);
  border-color: rgba(0,0,0,.1);
}

.coming-soon {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: var(--muted);
  font-weight: 500;
  background: rgba(255,255,255,.6);
  padding: 6px 16px;
  border-radius: 999px;
  border: 1px solid rgba(224,224,224,.5);
}

.badge {
  background: var(--blue-soft);
  color: var(--blue);
  font-size: 11px;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 999px;
}

/* Actual Mockups (Iframe based) */
.hero-visuals.real-mockups {
  position: relative;
  width: 100%;
  max-width: 1000px;
  height: 540px;
  display: flex;
  justify-content: center;
  perspective: 1000px;
  animation: fade-up 1s var(--ease) 0.2s both;
}

.iframe-container {
  position: absolute;
  background: var(--canvas);
  border-radius: 22px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255,255,255,.9);
  overflow: hidden;
}

.iframe-container iframe {
  width: 100%;
  height: 100%;
  transform-origin: top left;
}

.desktop-iframe {
  width: 800px;
  height: 500px;
  z-index: 1;
}

/* The desktop mockup is large (~1480x920 minimum), we need to scale it down into the 800x500 box */
.desktop-iframe iframe {
  width: 1480px;
  height: 925px;
  transform: scale(0.5405); /* 800 / 1480 */
}

.mobile-iframe {
  width: 250px;
  height: 525px;
  border-radius: 36px;
  right: 20px;
  bottom: -40px;
  z-index: 2;
  border: 8px solid white;
  box-shadow: 0 30px 60px rgba(0,0,0,.2);
  transform: rotate(5deg) scale(0.95);
  transition: transform 0.4s var(--ease);
}

.mobile-iframe:hover {
  transform: rotate(0deg) scale(1);
}

/* The mobile mockup is typically ~390x844 minimum */
.mobile-iframe iframe {
  width: 390px;
  height: 853px;
  transform: scale(0.599); /* (250-16)/390 (accounting for border) */
  margin-left: -4px; /* Slight offset correction for border */
}

/* Introduction Section */
.intro-section {
  max-width: 1000px;
  margin: 40px auto 80px;
  padding: 0 24px;
}

.intro-content {
  background: rgba(255,255,255,.6);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,.9);
  padding: 60px 48px;
  border-radius: 32px;
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.intro-content .section-title {
  margin-bottom: 32px;
}

.intro-text p {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
  max-width: 760px;
  margin: 0 auto;
}

/* Features Section */
.features {
  max-width: 1200px;
  margin: 100px auto;
  padding: 0 24px;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -.02em;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 18px;
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
}

.feature-card {
  background: rgba(255,255,255,.6);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,.9);
  padding: 40px 32px;
  border-radius: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  background: white;
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: var(--blue-soft);
  color: var(--blue);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.feature-icon svg {
  width: 28px;
  height: 28px;
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
}

/* Footer */
.footer {
  text-align: center;
  padding: 40px 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

/* Animations */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 900px) {
  .hero-title {
    font-size: 38px;
  }
  .hero-subtitle {
    font-size: 16px;
    padding: 0 16px;
  }
  
  .nav-links {
    gap: 12px;
  }
  .nav-links a {
    font-size: 13px;
  }

  .hero-visuals.real-mockups {
    height: 560px;
  }
  .desktop-iframe {
    display: none;
  }
  .mobile-iframe {
    display: block; /* Show on mobile screens */
    position: relative;
    right: auto;
    bottom: auto;
    margin: 0 auto;
    transform: none;
  }
  .mobile-iframe:hover {
    transform: translateY(-5px);
  }
  
  .hero-cta {
    flex-direction: column;
    padding: 0 20px;
  }
  .intro-content {
    padding: 32px 20px;
  }
}