/* Fullscreen Device Mockup (全屏设备透视图) Theme - High Performance Optimized */
:root {
  --mock-bg: #0b0f19;
  --mock-surface: #111827;
  --mock-card: #1f2937;
  --mock-primary: #38bdf8;
  --mock-primary-hover: #0284c7;
  --mock-accent: #818cf8;
  --mock-glow: rgba(56, 189, 248, 0.25);
  --mock-heading: #f8fafc;
  --mock-text: #cbd5e1;
  --mock-muted: #94a3b8;
  --mock-border: #334155;
  --mock-radius: 12px;
  --mock-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.6);
  --mock-shadow-3d: 0 30px 60px -12px rgba(56, 189, 248, 0.22);
}

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

html {
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--mock-bg);
  color: var(--mock-text);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(11, 15, 25, 0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--mock-border);
  will-change: transform;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 800;
  color: var(--mock-heading);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--mock-primary), var(--mock-accent));
  color: #0f172a;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  box-shadow: 0 0 15px var(--mock-glow);
}

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

.nav-link {
  font-size: 15px;
  font-weight: 600;
  color: var(--mock-text);
  padding: 8px 0;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--mock-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--mock-primary);
  border-radius: 2px;
  box-shadow: 0 0 8px var(--mock-primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--mock-radius);
  cursor: pointer;
  transition: all 0.25s ease;
  will-change: transform;
}

.btn-primary {
  background: linear-gradient(135deg, var(--mock-primary), #0284c7);
  color: #0f172a;
  box-shadow: 0 4px 20px var(--mock-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(56, 189, 248, 0.45);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.05);
  color: var(--mock-heading);
  border: 1px solid var(--mock-border);
}

.btn-outline:hover {
  border-color: var(--mock-primary);
  color: var(--mock-primary);
  background: rgba(56, 189, 248, 0.1);
  transform: translateY(-2px);
}

/* 3D Device Mockup Showcase Section */
.hero {
  padding: 70px 0 60px;
  text-align: center;
  background: radial-gradient(circle at 50% 30%, rgba(56, 189, 248, 0.15) 0%, rgba(11, 15, 25, 1) 70%);
  position: relative;
  overflow: hidden;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  font-size: 13px;
  font-weight: 700;
  color: var(--mock-primary);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: 30px;
  margin-bottom: 24px;
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.15);
}

.hero-title {
  font-size: 46px;
  font-weight: 900;
  color: var(--mock-heading);
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-title span {
  background: linear-gradient(135deg, var(--mock-primary), var(--mock-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--mock-muted);
  max-width: 800px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

/* 3D Perspective Device Mockup Wrapper */
.mockup-perspective-wrapper {
  perspective: 1200px;
  padding: 20px 0;
}

.mockup-3d-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  transform: rotateX(12deg) rotateY(0deg) rotateZ(0deg);
  transform-style: preserve-3d;
  transition: transform 0.5s ease;
}

.mockup-perspective-wrapper:hover .mockup-3d-grid {
  transform: rotateX(4deg) rotateY(0deg);
}

.mockup-device-card {
  background: var(--mock-surface);
  border: 1px solid var(--mock-border);
  border-radius: 16px;
  padding: 16px;
  box-shadow: var(--mock-shadow-3d);
  position: relative;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: transform;
  overflow: hidden;
}

.mockup-device-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--mock-primary), var(--mock-accent));
}

.mockup-device-card:hover {
  transform: translateZ(30px) translateY(-10px);
  border-color: var(--mock-primary);
  box-shadow: 0 35px 70px -10px rgba(56, 189, 248, 0.35);
}

.mockup-device-frame {
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
  position: relative;
}

.mockup-device-frame img {
  width: 100%;
  height: 230px;
  object-fit: cover;
  content-visibility: auto;
}

.mockup-overlay-btn {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid var(--mock-primary);
  color: var(--mock-primary);
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 700;
  opacity: 0.9;
  transition: all 0.2s ease;
}

.mockup-device-card:hover .mockup-overlay-btn {
  background: var(--mock-primary);
  color: #0f172a;
  box-shadow: 0 0 15px var(--mock-primary);
}

.mockup-caption {
  margin-top: 14px;
  font-size: 14px;
  font-weight: 800;
  color: var(--mock-heading);
}

/* Sections */
.section {
  padding: 70px 0;
  border-bottom: 1px solid var(--mock-border);
  content-visibility: auto;
  contain-intrinsic-size: 1px 600px;
}

.section-panel {
  background: var(--mock-surface);
}

.section-title {
  text-align: center;
  margin-bottom: 50px;
}

.section-title h2 {
  font-size: 34px;
  font-weight: 900;
  color: var(--mock-heading);
  margin-bottom: 12px;
}

.section-title p {
  font-size: 16px;
  color: var(--mock-muted);
}

/* 3x3 Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--mock-bg);
  border: 1px solid var(--mock-border);
  border-radius: var(--mock-radius);
  padding: 28px 24px;
  transition: all 0.3s ease;
  position: relative;
}

.feature-card:hover {
  background: var(--mock-card);
  border-color: var(--mock-primary);
  transform: translateY(-4px);
  box-shadow: 0 15px 30px rgba(0,0,0,0.4);
}

.feature-icon-badge {
  width: 40px;
  height: 40px;
  background: rgba(56, 189, 248, 0.12);
  color: var(--mock-primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 15px;
  margin-bottom: 16px;
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.feature-card h3 {
  font-size: 19px;
  font-weight: 800;
  color: var(--mock-heading);
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 14px;
  color: var(--mock-muted);
  line-height: 1.6;
}

/* Blog Section (2 Columns, Light Text against dark background) */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.blog-card {
  background: var(--mock-surface);
  border: 1px solid var(--mock-border);
  border-radius: var(--mock-radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
}

.blog-card:hover {
  border-color: var(--mock-primary);
  transform: translateY(-3px);
  box-shadow: var(--mock-shadow);
}

.blog-date {
  font-size: 12px;
  font-weight: 700;
  color: var(--mock-primary);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.blog-card h3 {
  font-size: 20px;
  font-weight: 800;
  color: var(--mock-heading);
  margin-bottom: 12px;
}

.blog-card p {
  font-size: 14px;
  color: var(--mock-muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

.blog-link {
  font-size: 14px;
  font-weight: 700;
  color: var(--mock-primary);
}

.blog-link:hover {
  text-decoration: underline;
}

.more-wrapper {
  text-align: center;
  margin-top: 40px;
}

/* FAQ Section (Centered Single Column) */
.faq-container {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.faq-item {
  background: var(--mock-bg);
  border: 1px solid var(--mock-border);
  border-radius: var(--mock-radius);
  padding: 24px 28px;
}

.faq-question {
  font-size: 18px;
  font-weight: 800;
  color: var(--mock-heading);
  margin-bottom: 10px;
}

.faq-answer {
  font-size: 15px;
  color: var(--mock-muted);
  line-height: 1.7;
}

/* Download Page Grid */
.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.download-card {
  background: var(--mock-surface);
  border: 1px solid var(--mock-border);
  border-radius: var(--mock-radius);
  padding: 36px 24px;
  text-align: center;
  transition: all 0.3s ease;
}

.download-card:hover {
  border-color: var(--mock-primary);
  transform: translateY(-4px);
  box-shadow: var(--mock-shadow);
}

.download-card-icon {
  font-size: 42px;
  margin-bottom: 16px;
}

.download-card h3 {
  font-size: 22px;
  font-weight: 800;
  color: var(--mock-heading);
  margin-bottom: 12px;
}

.download-card p {
  font-size: 14px;
  color: var(--mock-muted);
  margin-bottom: 24px;
}

.download-web-banner {
  background: linear-gradient(135deg, #1e293b, var(--mock-surface));
  border: 1px solid var(--mock-border);
  border-radius: var(--mock-radius);
  padding: 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.download-web-banner h3 {
  font-size: 22px;
  color: var(--mock-heading);
  margin-bottom: 6px;
}

.download-web-banner p {
  color: var(--mock-muted);
  font-size: 14px;
}

/* Footer */
.footer {
  background: #030712;
  color: var(--mock-muted);
  padding: 60px 0 30px;
  border-top: 2px solid var(--mock-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 50px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 800;
  color: var(--mock-heading);
  margin-bottom: 20px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.footer-col p {
  font-size: 14px;
  color: var(--mock-muted);
  line-height: 1.7;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 12px;
}

.footer-col ul li a {
  font-size: 14px;
  color: var(--mock-muted);
}

.footer-col ul li a:hover {
  color: var(--mock-primary);
  text-decoration: underline;
}

.footer-copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  color: #475569;
}

@media (max-width: 992px) {
  .mockup-3d-grid, .features-grid, .download-grid {
    grid-template-columns: 1fr;
    transform: none;
  }
  .blog-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .download-web-banner {
    flex-direction: column;
    text-align: center;
  }
}