/* ==========================================================================
   CatCloud (猫猫云) - Deep-Space Dark Mode Native Stylesheet
   Color Palette:
     - Background: #0B1020
     - Panel: #121A30
     - Primary Neon Cyan: #39E6C8
     - Secondary Violet: #8F7BFF
     - Text Main: #E9EDF8
     - Text Dim: #8A93B2
     - Hairlines: rgba(255, 255, 255, 0.08)
   ========================================================================== */

:root {
  --bg-color: #0B1020;
  --panel-bg: #121A30;
  --panel-card: rgba(18, 26, 48, 0.85);
  --primary-cyan: #39E6C8;
  --primary-cyan-rgb: 57, 230, 200;
  --secondary-violet: #8F7BFF;
  --text-main: #E9EDF8;
  --text-dim: #8A93B2;
  --border-hairline: rgba(255, 255, 255, 0.08);
  --border-hover: #39E6C8;
  --font-heading: "Space Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", Consolas, "Courier New", monospace;
  --container-max: 1200px;
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-color);
  color: var(--text-main);
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-color);
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(143, 123, 255, 0.08) 0%, transparent 60%),
    radial-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 100% 100%, 28px 28px;
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-main);
  letter-spacing: -0.02em;
  font-weight: 700;
}

p {
  color: var(--text-dim);
}

a {
  color: var(--primary-cyan);
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

a:hover {
  color: #fff;
}

.mono {
  font-family: var(--font-mono);
}

.micro-label {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--primary-cyan);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

/* Container */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(11, 16, 32, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-hairline);
  padding: 0.85rem 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

.brand-logo svg {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.brand-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(57, 230, 200, 0.1);
  color: var(--primary-cyan);
  border: 1px solid rgba(57, 230, 200, 0.25);
  font-weight: 500;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  color: var(--text-dim);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-main);
}

.nav-link.highlight {
  color: var(--secondary-violet);
  position: relative;
}

.nav-link.highlight:hover {
  color: #c7bfff;
}

.nav-link.highlight::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--primary-cyan);
  border-radius: 50%;
  margin-left: 4px;
  vertical-align: middle;
}

.nav-cta {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  padding: 0.45rem 1rem;
  background: rgba(57, 230, 200, 0.12);
  border: 1px solid var(--primary-cyan);
  color: var(--primary-cyan);
  border-radius: 6px;
  font-weight: 600;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.nav-cta:hover {
  background: var(--primary-cyan);
  color: #0B1020;
}

/* Glass Panels */
.glass-panel {
  background: var(--panel-bg);
  border: 1px solid var(--border-hairline);
  border-radius: 12px;
  padding: 2rem;
  transition: border-color var(--transition-fast);
  position: relative;
}

.glass-panel:hover {
  border-color: var(--border-hover);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 0.85rem 1.6rem;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  min-height: 48px;
  box-sizing: border-box;
}

.btn-primary {
  background: var(--primary-cyan);
  color: #0B1020;
  border-color: var(--primary-cyan);
}

.btn-primary:hover {
  background: #25d4b5;
  color: #000;
  border-color: #25d4b5;
}

.btn-secondary {
  background: rgba(18, 26, 48, 0.8);
  color: var(--text-main);
  border-color: var(--border-hairline);
}

.btn-secondary:hover {
  border-color: var(--primary-cyan);
  color: var(--primary-cyan);
}

.btn-dofollow {
  background: rgba(143, 123, 255, 0.1);
  color: #d1c8ff;
  border-color: rgba(143, 123, 255, 0.35);
}

.btn-dofollow:hover {
  border-color: var(--secondary-violet);
  background: rgba(143, 123, 255, 0.2);
  color: #fff;
}

/* Hero Section */
.hero-section {
  padding: 4.5rem 0 3.5rem;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2.5rem;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
}

.hero-title {
  font-size: 2.85rem;
  line-height: 1.18;
  margin: 0.5rem 0 1.25rem;
  color: var(--text-main);
}

.hero-title .brand-accent {
  color: var(--primary-cyan);
}

.hero-subtitle {
  font-size: 1.125rem;
  line-height: 1.65;
  color: var(--text-dim);
  margin-bottom: 2rem;
  max-width: 580px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

/* Terminal Window */
.terminal-window {
  background: #0d1428;
  border: 1px solid var(--border-hairline);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
  font-family: var(--font-mono);
}

.terminal-header {
  background: rgba(18, 26, 48, 0.9);
  padding: 0.65rem 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border-hairline);
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
}

.terminal-dot.close { background: #ff5f56; }
.terminal-dot.min { background: #ffbd2e; }
.terminal-dot.max { background: #27c93f; }

.terminal-title {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--text-dim);
}

.terminal-body {
  padding: 1.25rem;
  font-size: 0.875rem;
  line-height: 1.7;
}

.terminal-line {
  display: flex;
  gap: 8px;
  align-items: center;
}

.terminal-prompt {
  color: var(--primary-cyan);
}

.terminal-cmd {
  color: var(--text-main);
}

.terminal-output {
  color: var(--text-dim);
  margin-top: 0.25rem;
}

.terminal-success {
  color: var(--primary-cyan);
}

/* Stats Row */
.stats-strip {
  margin: 3.5rem 0 4.5rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.stat-card {
  background: var(--panel-bg);
  border: 1px solid var(--border-hairline);
  border-radius: 10px;
  padding: 1.5rem 1.75rem;
  transition: border-color var(--transition-fast);
}

.stat-card:hover {
  border-color: var(--primary-cyan);
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 2.15rem;
  font-weight: 700;
  color: var(--primary-cyan);
  line-height: 1.1;
  margin-bottom: 0.35rem;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

/* API Code Block */
.api-block-section {
  margin-bottom: 5rem;
}

.code-container {
  background: #0d1428;
  border: 1px solid var(--border-hairline);
  border-radius: 12px;
  overflow: hidden;
}

.code-header {
  background: rgba(18, 26, 48, 0.9);
  padding: 0.75rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-hairline);
}

.code-filename {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-dim);
}

.copy-btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: transparent;
  color: var(--primary-cyan);
  border: 1px solid rgba(57, 230, 200, 0.3);
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  background: rgba(57, 230, 200, 0.15);
  border-color: var(--primary-cyan);
}

.code-content {
  padding: 1.25rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--text-main);
}

.token-comment { color: #5a668a; }
.token-key { color: var(--secondary-violet); }
.token-val { color: var(--primary-cyan); }
.token-str { color: #f2a65a; }

/* Section Common */
.section {
  padding: 4.5rem 0;
  border-top: 1px solid var(--border-hairline);
}

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3rem;
}

.section-title {
  font-size: 2.15rem;
  margin-bottom: 0.85rem;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-dim);
}

/* Feature 3 Cards */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.feature-card {
  display: flex;
  flex-direction: column;
}

.feature-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  background: rgba(57, 230, 200, 0.08);
  border: 1px solid rgba(57, 230, 200, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-cyan);
  margin-bottom: 1.25rem;
}

.feature-title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.feature-text {
  font-size: 0.9375rem;
  color: var(--text-dim);
  line-height: 1.6;
}

/* Streaming & AI Cards */
.media-ai-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
}

.media-ai-card {
  padding: 2.25rem;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 1.25rem;
}

.tech-tag {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  padding: 4px 10px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-hairline);
  color: var(--text-dim);
}

.tech-tag.active {
  color: var(--primary-cyan);
  border-color: rgba(57, 230, 200, 0.3);
  background: rgba(57, 230, 200, 0.06);
}

/* Pricing Table */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  align-items: stretch;
}

.pricing-card {
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing-card.featured {
  border-color: rgba(57, 230, 200, 0.4);
  box-shadow: 0 0 30px rgba(57, 230, 200, 0.06);
}

.badge-popular {
  position: absolute;
  top: -12px;
  right: 20px;
  background: var(--primary-cyan);
  color: #0B1020;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 20px;
  text-transform: uppercase;
}

.pricing-name {
  font-size: 1.35rem;
  margin-bottom: 0.5rem;
}

.pricing-desc {
  font-size: 0.875rem;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
  min-height: 42px;
}

.pricing-price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-hairline);
}

.price-currency {
  font-size: 1.25rem;
  color: var(--primary-cyan);
  font-weight: 600;
}

.price-amount {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1;
}

.price-period {
  font-size: 0.875rem;
  color: var(--text-dim);
}

.pricing-features {
  list-style: none;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.pricing-features li {
  font-size: 0.9375rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 0.85rem;
}

.pricing-features li::before {
  content: "✓";
  color: var(--primary-cyan);
  font-family: var(--font-mono);
  font-weight: bold;
}

/* FAQ Accordion */
.faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  border: 1px solid var(--border-hairline);
  border-radius: 8px;
  background: var(--panel-bg);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: rgba(57, 230, 200, 0.35);
}

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: none;
  border: none;
  color: var(--text-main);
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-icon {
  font-family: var(--font-mono);
  color: var(--primary-cyan);
  font-size: 1.25rem;
  transition: transform var(--transition-fast);
}

.faq-answer {
  padding: 0 1.5rem 1.25rem;
  font-size: 0.9375rem;
  color: var(--text-dim);
  line-height: 1.65;
}

/* Testimonials / User Reviews */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.review-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-text {
  font-size: 0.9375rem;
  color: var(--text-main);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.review-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-hairline);
  padding-top: 1rem;
}

.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(143, 123, 255, 0.15);
  border: 1px solid rgba(143, 123, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  color: var(--secondary-violet);
  font-size: 0.875rem;
}

.review-user-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
}

.review-user-role {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
}

.rating-stars {
  color: #ffb800;
  font-size: 0.8125rem;
  margin-bottom: 0.5rem;
}

/* Footer (strictly 4 links per requirement) */
.site-footer {
  border-top: 1px solid var(--border-hairline);
  background: #080c18;
  padding: 3.5rem 0 2rem;
  margin-top: 4rem;
}

.footer-top {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.footer-links-row {
  display: flex;
  gap: 2.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-link-item {
  color: var(--text-dim);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.footer-link-item:hover {
  color: var(--primary-cyan);
}

.footer-bottom {
  border-top: 1px solid var(--border-hairline);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  color: #5a668a;
  font-family: var(--font-mono);
}

/* Content Pages (About, Terms, Privacy, Sitemap, News) */
.page-container {
  max-width: 880px;
  margin: 3rem auto 5rem;
  padding: 0 1.5rem;
}

.page-header {
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-hairline);
  padding-bottom: 1.5rem;
}

.page-title {
  font-size: 2.4rem;
  margin-bottom: 0.75rem;
}

.page-meta {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-dim);
}

.prose {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: #c9d2eb;
}

.prose h2 {
  font-size: 1.5rem;
  margin: 2.5rem 0 1rem;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-hairline);
  padding-bottom: 0.5rem;
}

.prose h3 {
  font-size: 1.25rem;
  margin: 1.75rem 0 0.75rem;
  color: var(--primary-cyan);
}

.prose p {
  margin-bottom: 1.25rem;
}

.prose ul, .prose ol {
  margin: 0 0 1.5rem 1.5rem;
  color: var(--text-dim);
}

.prose li {
  margin-bottom: 0.5rem;
}

.prose blockquote {
  border-left: 3px solid var(--primary-cyan);
  padding: 0.75rem 1.25rem;
  background: rgba(57, 230, 200, 0.05);
  border-radius: 0 6px 6px 0;
  margin: 1.5rem 0;
  color: var(--text-dim);
}

.back-home-bar {
  margin-bottom: 2rem;
}

.back-home-link {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--primary-cyan);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* News List & Articles */
.news-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.article-summary-card {
  background: var(--panel-bg);
  border: 1px solid var(--border-hairline);
  border-radius: 10px;
  padding: 1.75rem;
  transition: all var(--transition-fast);
}

.article-summary-card:hover {
  border-color: var(--primary-cyan);
  transform: translateY(-2px);
}

.article-summary-card .article-title-link {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  display: block;
  margin-bottom: 0.65rem;
}

.article-summary-card .article-title-link:hover {
  color: var(--primary-cyan);
}

/* Responsive Media Queries */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .features-grid, .pricing-grid, .reviews-grid {
    grid-template-columns: 1fr;
    max-width: 540px;
    margin: 0 auto;
  }
  .media-ai-grid {
    grid-template-columns: 1fr;
  }
  .stats-strip {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .site-header {
    padding: 0.75rem 0;
  }
  .header-inner {
    flex-wrap: wrap;
  }
  .main-nav {
    order: 3;
    width: 100%;
    overflow-x: auto;
    padding-top: 0.75rem;
    gap: 1.25rem;
  }
  .hero-title {
    font-size: 2.15rem;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 0.75rem;
    text-align: center;
  }
  .footer-links-row {
    gap: 1.25rem;
  }
}