/* Cyber Acid Liquid (酸性液体渐变) Theme - High Performance Optimized */
:root {
  --acid-bg: #0b0217;
  --acid-surface: #150727;
  --acid-card: #200d3b;
  --acid-green: #ccff00;
  --acid-purple: #a855f7;
  --acid-pink: #ff00c8;
  --acid-cyan: #00f0ff;
  --acid-text: #ffffff;
  --acid-muted: #b8a3e0;
  --acid-border: rgba(204, 255, 0, 0.35);
  --acid-gradient: linear-gradient(135deg, #ccff00 0%, #00ffcc 50%, #ff00c8 100%);
  --acid-glow: 0 0 20px rgba(204, 255, 0, 0.3);
}

* {
  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(--acid-bg);
  color: var(--acid-text);
  line-height: 1.6;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(168, 85, 247, 0.15) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(204, 255, 0, 0.1) 0%, transparent 40%);
  background-attachment: fixed;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

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

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(11, 2, 23, 0.92);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 2px solid var(--acid-green);
  box-shadow: 0 4px 25px rgba(204, 255, 0, 0.2);
  will-change: transform;
}

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 78px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 1px;
  color: #ffffff;
  text-transform: uppercase;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--acid-gradient);
  border-radius: 50%;
  color: #000000;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 900;
  box-shadow: var(--acid-glow);
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 14px;
  font-weight: 800;
  color: var(--acid-muted);
  letter-spacing: 0.5px;
}

.nav-link:hover, .nav-link.active {
  color: var(--acid-green);
  text-shadow: 0 0 10px var(--acid-green);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 1px;
  cursor: pointer;
  border-radius: 30px;
  transition: all 0.2s ease;
  position: relative;
  text-transform: uppercase;
  will-change: transform;
}

.btn-primary {
  background: var(--acid-gradient);
  color: #000000;
  box-shadow: var(--acid-glow);
}

.btn-primary:hover {
  transform: scale(1.05);
  box-shadow: 0 0 25px rgba(0, 255, 204, 0.6);
}

.btn-outline {
  background: transparent;
  color: var(--acid-green);
  border: 2px solid var(--acid-green);
  box-shadow: inset 0 0 10px rgba(204, 255, 0, 0.1);
}

.btn-outline:hover {
  background: rgba(204, 255, 0, 0.15);
  color: #ffffff;
  border-color: var(--acid-cyan);
  transform: scale(1.03);
}

/* Hero Section */
.hero {
  padding: 90px 0 70px;
  text-align: center;
  position: relative;
  border-bottom: 2px solid var(--acid-border);
}

.acid-badge {
  display: inline-block;
  padding: 6px 20px;
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: #000000;
  background: var(--acid-green);
  border-radius: 20px;
  box-shadow: var(--acid-glow);
  margin-bottom: 24px;
}

.hero-title {
  font-size: 46px;
  font-weight: 900;
  letter-spacing: 1px;
  line-height: 1.25;
  margin-bottom: 20px;
  color: #ffffff;
}

.hero-title span {
  background: var(--acid-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 12px rgba(204, 255, 0, 0.4));
}

.hero-subtitle {
  font-size: 18px;
  color: var(--acid-muted);
  max-width: 780px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

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

/* Acid Showcase Grid */
.acid-showcase {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.acid-card {
  background: var(--acid-surface);
  border: 2px solid var(--acid-border);
  border-radius: 16px;
  padding: 12px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  will-change: transform;
}

.acid-card:hover {
  transform: translate3d(0, -6px, 0);
  border-color: var(--acid-green);
  box-shadow: var(--acid-glow);
}

.acid-card img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  display: block;
  border-radius: 10px;
  content-visibility: auto;
}

.acid-card-label {
  margin-top: 12px;
  font-size: 13px;
  font-weight: 800;
  color: var(--acid-green);
  text-align: center;
  letter-spacing: 1px;
}

/* Sections - Performance Render Optimization */
.section {
  padding: 80px 0;
  border-bottom: 2px solid var(--acid-border);
  content-visibility: auto;
  contain-intrinsic-size: 1px 600px;
}

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

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

.section-title h2 {
  font-size: 34px;
  font-weight: 900;
  letter-spacing: 1px;
  margin-bottom: 12px;
  background: var(--acid-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

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

.feature-card {
  background: var(--acid-card);
  border: 1px solid var(--acid-border);
  border-radius: 16px;
  padding: 32px 24px;
  position: relative;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover {
  transform: translate3d(0, -4px, 0);
  border-color: var(--acid-pink);
  box-shadow: 0 0 20px rgba(255, 0, 200, 0.3);
}

.feature-icon {
  width: 42px;
  height: 42px;
  background: rgba(204, 255, 0, 0.1);
  border: 2px solid var(--acid-green);
  color: var(--acid-green);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 15px;
  margin-bottom: 20px;
  box-shadow: var(--acid-glow);
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 12px;
}

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

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

.blog-card {
  background: var(--acid-surface);
  border: 1px solid var(--acid-border);
  border-radius: 16px;
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

.blog-date {
  font-size: 12px;
  font-weight: 800;
  color: var(--acid-green);
  margin-bottom: 12px;
  letter-spacing: 1.5px;
}

.blog-card h3 {
  font-size: 20px;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 12px;
}

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

.blog-link {
  font-size: 14px;
  font-weight: 800;
  color: var(--acid-cyan);
  letter-spacing: 0.5px;
}

.blog-link:hover {
  color: var(--acid-green);
  text-shadow: 0 0 8px var(--acid-green);
}

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

/* FAQ Section */
.faq-container {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--acid-card);
  border: 1px solid var(--acid-border);
  border-radius: 14px;
  padding: 24px 30px;
}

.faq-question {
  font-size: 17px;
  font-weight: 800;
  margin-bottom: 10px;
  color: var(--acid-green);
}

.faq-answer {
  font-size: 14px;
  color: var(--acid-muted);
  line-height: 1.7;
}

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

.download-card {
  background: var(--acid-surface);
  border: 1px solid var(--acid-border);
  border-radius: 16px;
  padding: 36px 24px;
  text-align: center;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

.download-card-icon {
  font-size: 38px;
  margin-bottom: 16px;
}

.download-card h3 {
  font-size: 20px;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 12px;
}

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

.download-web-banner {
  background: var(--acid-card);
  border: 2px solid var(--acid-green);
  border-radius: 16px;
  padding: 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  box-shadow: var(--acid-glow);
}

.download-web-banner h3 {
  font-size: 22px;
  color: var(--acid-green);
  margin-bottom: 8px;
}

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

/* Footer */
.footer {
  background: #060112;
  color: var(--acid-text);
  padding: 70px 0 30px;
  border-top: 2px solid var(--acid-border);
}

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

.footer-col h4 {
  font-size: 16px;
  font-weight: 800;
  margin-bottom: 20px;
  color: var(--acid-green);
  letter-spacing: 1px;
}

.footer-col p {
  font-size: 14px;
  color: var(--acid-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(--acid-muted);
}

.footer-col ul li a:hover {
  color: var(--acid-green);
  text-shadow: 0 0 5px var(--acid-green);
}

.footer-copyright {
  border-top: 1px solid rgba(204, 255, 0, 0.15);
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  color: var(--acid-muted);
  letter-spacing: 1px;
}

@media (max-width: 992px) {
  .acid-showcase, .features-grid, .download-grid {
    grid-template-columns: 1fr;
  }
  .blog-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .download-web-banner {
    flex-direction: column;
    text-align: center;
  }
}