/* ===================================================================
   奈思云 (naisecloud.homes) - Official Stylesheet (Pure Native CSS3)
   Theme: Nice Cloud · Sunny Day (风和日丽 · 晴空万里 · 清风怡人)
   Colors: Radiant Sky Azure, Sun Gold, Cloud White & Fresh Breeze Cyan
   Optimized for Sub-Second Loading, Ultra-Tactile UX & Supreme SERP
   =================================================================== */

:root {
  /* Nice Cloud · Sunny Day Sky Palette */
  --bg-sky-top: #edf7fd;
  --bg-sky-mid: #f6faff;
  --bg-white: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.94);
  --bg-card-hover: #ffffff;
  --border-subtle: #e0f2fe;
  --border-focus: #38bdf8;
  --border-nav: #bae6fd;

  /* Sky Azure & Cerulean */
  --sky-100: #e0f2fe;
  --sky-200: #bae6fd;
  --sky-300: #7dd3fc;
  --sky-400: #38bdf8;
  --sky-500: #0ea5e9;
  --sky-600: #0284c7;
  --sky-700: #0369a1;
  --sky-glow: rgba(14, 165, 233, 0.35);

  /* Sun Gold & Warmth (风和日丽) */
  --sun-300: #fde047;
  --sun-400: #fbbf24;
  --sun-500: #f59e0b;
  --sun-glow: rgba(245, 158, 11, 0.32);

  /* Fresh Breeze Mint & Teal */
  --breeze-teal: #06b6d4;
  --breeze-mint: #10b981;

  /* High-Contrast Clear Oceanic Typography */
  --text-primary: #0c4a6e;
  --text-secondary: #335372;
  --text-muted: #64748b;
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  /* Spacing & Radii */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  /* Transition for smooth fade and tactile response */
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Base Reset & Typography */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-sky-top);
  color: var(--text-primary);
  font-family: var(--font-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  line-height: 1.65;
  background: linear-gradient(180deg, #e8f4fc 0%, #f4f9fd 400px, #ffffff 100%);
  color: var(--text-primary);
  overflow-x: hidden;
  position: relative;
}

/* Global Subtle Ambient Sunny Breeze & Cloud Background */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(circle at 85% 60px, rgba(253, 224, 71, 0.22) 0%, rgba(245, 158, 11, 0.06) 35%, transparent 65%),
    radial-gradient(circle at 15% 150px, rgba(56, 189, 248, 0.15) 0%, transparent 55%),
    linear-gradient(rgba(14, 165, 233, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14, 165, 233, 0.02) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 48px 48px, 48px 48px;
  pointer-events: none;
  z-index: 0;
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Link Styles */
a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

/* Section Common Styles */
section {
  padding: 85px 0;
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 56px auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: rgba(14, 165, 233, 0.08);
  border: 1px solid rgba(14, 165, 233, 0.25);
  border-radius: var(--radius-full);
  color: var(--sky-700);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 16px;
  color: #0c4a6e;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Gradient Text Helper - Sunny Cloud Cyan */
.gradient-text {
  background: linear-gradient(135deg, #0284c7 0%, #0ea5e9 50%, #0369a1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ===================================================================
   BUTTON SYSTEM - Extra Distinct, 3D Depth, Tactile & High-Contrast
   =================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 700;
  border-radius: var(--radius-md);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
  letter-spacing: 0.3px;
}

.btn:active {
  transform: translateY(1px) scale(0.98);
}

/* Primary Button: Radiant Sky Cerulean with Inset Shine & Glow */
.btn-primary {
  background: linear-gradient(135deg, #0ea5e9 0%, #0284c7 70%, #0369a1 100%);
  color: #ffffff;
  border-color: #0284c7;
  box-shadow: 0 4px 18px rgba(2, 132, 199, 0.36), inset 0 1px 1px rgba(255, 255, 255, 0.45);
  text-shadow: 0 1px 2px rgba(3, 105, 161, 0.4);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
  border-color: #0369a1;
  box-shadow: 0 6px 26px rgba(2, 132, 199, 0.5), inset 0 1px 2px rgba(255, 255, 255, 0.6);
  transform: translateY(-2px);
  color: #ffffff;
}

/* Secondary Button: Pure Cloud White with Sky-Blue Crisp Border */
.btn-secondary {
  background: #ffffff;
  color: #0284c7;
  border: 1.5px solid #bae6fd;
  box-shadow: 0 3px 12px rgba(12, 74, 110, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.btn-secondary:hover {
  background: #f0f9ff;
  border-color: #0ea5e9;
  color: #0369a1;
  box-shadow: 0 5px 18px rgba(14, 165, 233, 0.2);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 20px;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  min-height: 42px;
}

.btn-md {
  padding: 12px 26px;
  font-size: 0.9375rem;
  min-height: 48px;
}

.btn-lg {
  padding: 16px 38px;
  font-size: 1.0625rem;
  font-weight: 800;
  border-radius: var(--radius-md);
  min-height: 54px;
}

.btn-block {
  width: 100%;
}

/* ===================================================================
   1. Navbar (Sticky Top Nav with Floating Blur and Clear Distinct Border)
   =================================================================== */
.navbar {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.90);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  /* Clear prominent border between top sticky nav and body */
  border-bottom: 2px solid #bae6fd;
  box-shadow: 0 4px 20px rgba(12, 74, 110, 0.07), 0 1px 0 rgba(2, 132, 199, 0.12);
  transition: var(--transition);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

/* Brand Logo (Clickable to Homepage) */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 900;
  color: #0c4a6e;
  letter-spacing: -0.5px;
  text-decoration: none;
}

.brand-logo-img {
  height: 38px;
  width: auto;
  display: block;
}

/* Navigation Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 6px 4px;
  position: relative;
  transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
  color: var(--sky-600);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2.5px;
  background: var(--sky-600);
  transition: width 0.25s ease;
  border-radius: var(--radius-full);
}

.nav-link:hover::after {
  width: 100%;
}

/* Nav Actions */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Mobile Hamburger Button */
.mobile-menu-btn {
  display: none;
  background: #ffffff;
  border: 1.5px solid var(--border-nav);
  color: var(--text-primary);
  padding: 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

/* Mobile Drawer Menu */
.mobile-drawer {
  display: none;
  flex-direction: column;
  gap: 16px;
  padding: 20px 24px;
  background: #ffffff;
  border-bottom: 2px solid var(--border-nav);
  box-shadow: 0 10px 25px rgba(12, 74, 110, 0.1);
}

.mobile-drawer.open {
  display: flex;
}

.mobile-drawer .nav-link {
  padding: 10px 0;
  font-size: 1rem;
  border-bottom: 1px solid #f1f5f9;
}

/* ===================================================================
   2. Hero Section (Sunny Day Cloud + 2-Col Grid + Floating Badges)
   =================================================================== */
.hero-section {
  padding: 90px 0 85px 0;
  position: relative;
  overflow: hidden;
}

.hero-glow-1 {
  position: absolute;
  top: -80px;
  left: 10%;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.2) 0%, transparent 70%);
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
}

.hero-glow-2 {
  position: absolute;
  top: 60px;
  right: 5%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(253, 224, 71, 0.28) 0%, rgba(245, 158, 11, 0.1) 40%, transparent 70%);
  filter: blur(75px);
  pointer-events: none;
  z-index: 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
}

.hero-text-col {
  position: relative;
  z-index: 2;
  animation: fadeInUp 0.85s cubic-bezier(0.16, 1, 0.3, 1) both;
}

/* Discount Badge: Sunburst Amber */
.discount-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 18px;
  background: #fef3c7;
  border: 1.5px solid #fcd34d;
  border-radius: var(--radius-full);
  color: #b45309;
  font-size: 0.9375rem;
  font-weight: 800;
  margin-bottom: 24px;
  box-shadow: 0 2px 12px rgba(245, 158, 11, 0.18);
  animation: pulseBadge 3s infinite ease-in-out;
}

@keyframes pulseBadge {
  0%, 100% {
    box-shadow: 0 2px 10px rgba(245, 158, 11, 0.2);
    border-color: #fcd34d;
  }
  50% {
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.38);
    border-color: #f59e0b;
  }
}

.hero-title {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -1px;
  margin-bottom: 24px;
  color: #0c4a6e;
}

.hero-subtitle {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 600px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* Hero Right Column: Graphic Wrap & Floating Badges */
.hero-art-col {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: center;
  animation: fadeIn 1.1s ease-out both;
}

.hero-graphic-wrap {
  position: relative;
  width: 100%;
  max-width: 440px;
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.art-halo {
  position: absolute;
  inset: 10%;
  background: radial-gradient(circle, rgba(253, 224, 71, 0.28) 0%, rgba(56, 189, 248, 0.15) 50%, transparent 75%);
  filter: blur(40px);
  border-radius: 50%;
  z-index: 0;
  animation: haloPulse 6s infinite alternate ease-in-out;
}

@keyframes haloPulse {
  0% { transform: scale(0.92); opacity: 0.7; }
  100% { transform: scale(1.15); opacity: 1; }
}

/* Floating Marketing Badges (White Cloud Card with Sky-Blue Glow) */
.art-floating-badge {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  background: rgba(255, 255, 255, 0.95);
  border: 1.5px solid #bae6fd;
  border-radius: var(--radius-md);
  color: #0c4a6e;
  font-size: 0.875rem;
  font-weight: 700;
  backdrop-filter: blur(12px);
  box-shadow: 0 8px 24px rgba(12, 74, 110, 0.12);
  white-space: nowrap;
  z-index: 3;
}

.badge-top-left {
  top: 5%;
  left: -8%;
  animation: floatTop 5s infinite ease-in-out;
}

.badge-top-right {
  top: 14%;
  right: -10%;
  animation: floatBottom 5.8s infinite ease-in-out 0.3s;
}

.badge-bottom-right {
  bottom: 12%;
  right: -8%;
  animation: floatBottom 6s infinite ease-in-out 0.5s;
}

.badge-bottom-left {
  bottom: 4%;
  left: 2%;
  animation: floatTop 5.5s infinite ease-in-out 1s;
}

.ping-indicator {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 8px #10b981;
}

@keyframes floatTop {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-8px); }
}

@keyframes floatBottom {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(8px); }
}

/* SVG Vector Art Keyframe Animations */
.svg-rotate-slow {
  animation: svgSpin 25s linear infinite;
  transform-origin: 200px 200px;
}

.svg-rotate-rev {
  animation: svgSpinRev 18s linear infinite;
  transform-origin: 200px 200px;
}

.svg-pulse-core {
  animation: svgPulse 3.5s infinite ease-in-out;
  transform-origin: 200px 200px;
}

.svg-orbit-node {
  animation: svgNodePulse 2.5s infinite alternate ease-in-out;
}

@keyframes svgSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes svgSpinRev {
  from { transform: rotate(360deg); }
  to { transform: rotate(0deg); }
}

@keyframes svgPulse {
  0%, 100% { transform: scale(1); filter: drop-shadow(0 4px 10px rgba(14, 165, 233, 0.25)); }
  50% { transform: scale(1.03); filter: drop-shadow(0 6px 18px rgba(14, 165, 233, 0.45)); }
}

@keyframes svgNodePulse {
  0% { opacity: 0.65; transform: scale(0.9); }
  100% { opacity: 1; transform: scale(1.25); }
}

/* Fade in and out effects across page components */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===================================================================
   3. Core Advantages (Dynamic Cards Section: 3-Col + Streaming/AI)
   =================================================================== */
.features-section {
  background: linear-gradient(180deg, #f8fcff 0%, #edf7fd 100%);
  border-top: 2px solid #e0f2fe;
  border-bottom: 2px solid #e0f2fe;
}

.cards-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 48px;
}

.feature-card {
  background: #ffffff;
  border: 1.5px solid #e0f2fe;
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: 0 6px 20px rgba(12, 74, 110, 0.05);
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, #38bdf8, #0284c7, #f59e0b);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  background: #ffffff;
  border-color: #38bdf8;
  transform: translateY(-6px);
  box-shadow: 0 16px 36px rgba(14, 165, 233, 0.15);
}

.feature-card:hover::before {
  opacity: 1;
}

.card-icon-wrap {
  width: 60px;
  height: 60px;
  background: #f0f9ff;
  border: 1.5px solid #bae6fd;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0284c7;
  margin-bottom: 24px;
}

.card-title {
  font-size: 1.375rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: #0c4a6e;
}

.card-desc {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

/* Streaming & AI Support Banner Card (Sunny Sky Glassmorphism) */
.media-ai-card {
  background: linear-gradient(135deg, #ffffff 0%, #f0f9ff 100%);
  border: 2px solid #bae6fd;
  border-radius: var(--radius-lg);
  padding: 44px 40px;
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  align-items: center;
  gap: 36px;
  box-shadow: 0 12px 36px rgba(12, 74, 110, 0.08);
  position: relative;
  overflow: hidden;
}

.media-ai-card::after {
  content: "";
  position: absolute;
  right: -50px;
  bottom: -50px;
  width: 250px;
  height: 250px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.18) 0%, transparent 70%);
  pointer-events: none;
}

.media-ai-tags-wrap {
  position: relative;
  z-index: 1;
}

.media-ai-tags {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.media-tag {
  background: #ffffff;
  border: 1.5px solid #e0f2fe;
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: 0.9375rem;
  font-weight: 700;
  color: #0c4a6e;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: var(--transition);
  box-shadow: 0 2px 6px rgba(12, 74, 110, 0.04);
}

.media-tag:hover {
  background: #f0f9ff;
  border-color: #0ea5e9;
  color: #0284c7;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.15);
}

/* ===================================================================
   4. Pricing Section (3-Column Grid)
   =================================================================== */
.pricing-section {
  position: relative;
  background: #ffffff;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: #ffffff;
  border: 1.5px solid #e0f2fe;
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
  box-shadow: 0 8px 24px rgba(12, 74, 110, 0.06);
}

.pricing-card:hover {
  background: #ffffff;
  border-color: #38bdf8;
  transform: translateY(-8px);
  box-shadow: 0 18px 45px rgba(14, 165, 233, 0.18);
}

/* Featured / Recommended Card (Sunlit Cloud Highlight) */
.pricing-card.featured {
  background: linear-gradient(180deg, #ffffff 0%, #f0f9ff 100%);
  border: 2.5px solid #0284c7;
  box-shadow: 0 16px 45px rgba(2, 132, 199, 0.18);
  transform: translateY(-8px);
}

.pricing-card.featured:hover {
  transform: translateY(-14px);
  box-shadow: 0 24px 60px rgba(2, 132, 199, 0.28);
}

.card-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
  color: #ffffff;
  font-size: 0.8125rem;
  font-weight: 800;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.35);
  white-space: nowrap;
}

.pricing-header {
  margin-bottom: 20px;
}

.tier-name {
  font-size: 1.375rem;
  font-weight: 900;
  color: #0c4a6e;
  margin-bottom: 8px;
}

.tier-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  min-height: 42px;
}

.price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 16px;
}

.currency {
  font-size: 1.5rem;
  font-weight: 800;
  color: #0284c7;
}

.amount {
  font-size: 3rem;
  font-weight: 900;
  color: #0c4a6e;
  line-height: 1;
}

.period {
  font-size: 0.9375rem;
  color: var(--text-muted);
}

.traffic-pill {
  display: inline-block;
  align-self: flex-start;
  padding: 6px 16px;
  background: #f0f9ff;
  border: 1.5px solid #bae6fd;
  border-radius: var(--radius-full);
  color: #0284c7;
  font-size: 0.875rem;
  font-weight: 800;
  margin-bottom: 24px;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 36px;
  flex-grow: 1;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.feature-item strong {
  color: #0c4a6e;
}

.check-icon {
  width: 18px;
  height: 18px;
  color: #0284c7;
  flex-shrink: 0;
  margin-top: 2px;
}

/* ===================================================================
   5. Supported Platforms & Download Section
   =================================================================== */
.download-section {
  background: linear-gradient(180deg, #edf7fd 0%, #f6faff 100%);
  border-top: 2px solid #e0f2fe;
  border-bottom: 2px solid #e0f2fe;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.download-card {
  background: #ffffff;
  border: 1.5px solid #e0f2fe;
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: var(--transition);
  box-shadow: 0 6px 20px rgba(12, 74, 110, 0.05);
}

.download-card:hover {
  background: #ffffff;
  border-color: #38bdf8;
  transform: translateY(-6px);
  box-shadow: 0 14px 36px rgba(14, 165, 233, 0.15);
}

.platform-icon-wrap {
  width: 64px;
  height: 64px;
  background: #f0f9ff;
  border: 1.5px solid #bae6fd;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0284c7;
  margin-bottom: 20px;
}

.platform-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: #0c4a6e;
  margin-bottom: 10px;
}

.platform-clients {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 24px;
  flex-grow: 1;
}

/* ===================================================================
   6. Why Choose Section (SEO, GEO, SERP Core Focus)
   =================================================================== */
.why-section {
  position: relative;
  background: #ffffff;
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.why-card {
  background: #ffffff;
  border: 1.5px solid #e0f2fe;
  border-radius: var(--radius-lg);
  padding: 30px 24px;
  transition: var(--transition);
  box-shadow: 0 6px 18px rgba(12, 74, 110, 0.04);
}

.why-card:hover {
  background: #ffffff;
  border-color: #38bdf8;
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(14, 165, 233, 0.12);
}

.why-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
}

.why-emoji {
  font-size: 1.75rem;
  line-height: 1;
}

.why-title {
  font-size: 1.125rem;
  font-weight: 800;
  color: #0c4a6e;
}

.why-text {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* ===================================================================
   7. Testimonials Marquee Section (Pure CSS Infinite Loop)
   =================================================================== */
.testimonials-section {
  background: linear-gradient(180deg, #f0f9ff 0%, #edf7fd 100%);
  border-top: 2px solid #e0f2fe;
  border-bottom: 2px solid #e0f2fe;
  overflow: hidden;
  padding: 85px 0;
}

.marquee-container {
  width: 100%;
  overflow: hidden;
  position: relative;
  mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
}

.marquee-track {
  display: flex;
  gap: 24px;
  width: max-content;
  animation: marqueeScroll 45s linear infinite;
}

.marquee-container:hover .marquee-track {
  animation-play-state: paused;
}

@keyframes marqueeScroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.review-card {
  width: 380px;
  background: #ffffff;
  border: 1.5px solid #e0f2fe;
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 20px;
  flex-shrink: 0;
  transition: var(--transition);
  box-shadow: 0 8px 24px rgba(12, 74, 110, 0.06);
}

.review-card:hover {
  background: #ffffff;
  border-color: #38bdf8;
  box-shadow: 0 14px 32px rgba(14, 165, 233, 0.15);
}

.review-stars {
  color: #f59e0b;
  font-size: 1.125rem;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.review-quote {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: #0c4a6e;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid #f1f5f9;
  padding-top: 16px;
}

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.9375rem;
  box-shadow: 0 3px 10px rgba(2, 132, 199, 0.25);
}

.author-name {
  font-size: 0.9375rem;
  font-weight: 800;
  color: #0c4a6e;
}

.author-title {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ===================================================================
   8. FAQ Section (HTML5 Native <details> and <summary>)
   =================================================================== */
.faq-section {
  position: relative;
  background: #ffffff;
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: #ffffff;
  border: 1.5px solid #e0f2fe;
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: 0 4px 14px rgba(12, 74, 110, 0.04);
}

.faq-item:hover {
  border-color: #38bdf8;
}

.faq-item[open] {
  border-color: #0284c7;
  background: #f8fcff;
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.0625rem;
  font-weight: 800;
  color: #0c4a6e;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-icon {
  width: 20px;
  height: 20px;
  color: #0284c7;
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item[open] .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 22px 24px;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text-secondary);
  border-top: 1px solid #e2e8f0;
  margin-top: 4px;
  padding-top: 16px;
}

/* ===================================================================
   9. CTA Section (Bottom Intercepting Conversion Banner)
   =================================================================== */
.cta-bottom-section {
  padding: 85px 0 100px 0;
  background: linear-gradient(180deg, #ffffff 0%, #edf7fd 100%);
}

.cta-banner-wrap {
  background: linear-gradient(135deg, #ffffff 0%, #f0f9ff 100%);
  border: 2px solid #0284c7;
  border-radius: var(--radius-lg);
  padding: 64px 40px;
  text-align: center;
  max-width: 960px;
  margin: 0 auto;
  box-shadow: 0 20px 50px rgba(2, 132, 199, 0.15);
  position: relative;
  overflow: hidden;
}

.cta-banner-wrap .section-title {
  margin-bottom: 20px;
}

.cta-banner-wrap .section-desc {
  max-width: 680px;
  margin: 0 auto 36px auto;
}

/* ===================================================================
   10. Footer (Anchoring Deep Ocean Navy with Strictly 4 Titles)
   =================================================================== */
.footer {
  background: #082038;
  border-top: 2px solid #0284c7;
  padding: 48px 0 36px 0;
  position: relative;
  z-index: 1;
  color: #f8fafc;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  margin-bottom: 28px;
}

.footer .brand-logo {
  color: #ffffff;
}

.footer-links-four {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.footer-link-item a {
  color: #94a3b8;
  font-size: 0.9375rem;
  font-weight: 600;
  transition: var(--transition);
}

.footer-link-item a:hover {
  color: #38bdf8;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
  color: #64748b;
}

/* ===================================================================
   11. Static Subpages Content Typography & Layout
   (about.html, terms.html, privacy.html, sitemap.html)
   =================================================================== */
.page-header-wrap {
  padding: 60px 0 40px 0;
  text-align: center;
  border-bottom: 1.5px solid #e0f2fe;
  background: #f0f9ff;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.breadcrumb-nav a {
  color: var(--text-secondary);
}

.breadcrumb-nav a:hover {
  color: #0284c7;
}

.article-content-body {
  max-width: 860px;
  margin: 48px auto;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-secondary);
}

.article-content-body h2 {
  font-size: 1.625rem;
  font-weight: 900;
  color: #0c4a6e;
  margin: 40px 0 16px 0;
  border-left: 4px solid #0284c7;
  padding-left: 14px;
}

.article-content-body h3 {
  font-size: 1.25rem;
  font-weight: 800;
  color: #0c4a6e;
  margin: 28px 0 12px 0;
}

.article-content-body p {
  margin-bottom: 20px;
}

.article-content-body ul, .article-content-body ol {
  margin: 16px 0 24px 24px;
}

.article-content-body li {
  margin-bottom: 10px;
}

.content-box-highlight {
  background: #f0f9ff;
  border: 1.5px solid #bae6fd;
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 24px 0;
}

/* ===================================================================
   12. Responsive Media Queries
   =================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-cta-group {
    justify-content: center;
  }

  .cards-grid-3, .pricing-grid, .why-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .download-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .media-ai-card {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

@media (max-width: 768px) {
  .navbar-inner nav, .nav-actions {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .cards-grid-3, .pricing-grid, .download-grid, .why-grid {
    grid-template-columns: 1fr;
  }

  .pricing-card.featured {
    transform: none;
  }

  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }

  .footer-top {
    flex-direction: column;
    gap: 24px;
    text-align: center;
  }

  .footer-links-four {
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .hero-graphic-wrap {
    max-width: 320px;
  }

  .art-floating-badge {
    padding: 6px 12px;
    font-size: 0.75rem;
  }

  .badge-top-left {
    left: -2%;
    top: 2%;
  }

  .badge-top-right {
    right: -2%;
    top: 6%;
  }

  .badge-bottom-right {
    right: -2%;
    bottom: 4%;
  }

}

/* ===================================================================
   13. Article Hub & Detail Pages (SEO Article System)
   =================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin: 48px 0 80px 0;
}

.article-card {
  background: #ffffff;
  border: 1.5px solid #e0f2fe;
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  box-shadow: 0 6px 20px rgba(12, 74, 110, 0.05);
  position: relative;
  overflow: hidden;
}

.article-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, #38bdf8, #0284c7);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.article-card:hover {
  background: #ffffff;
  border-color: #38bdf8;
  transform: translateY(-6px);
  box-shadow: 0 16px 36px rgba(14, 165, 233, 0.15);
}

.article-card:hover::before {
  opacity: 1;
}

.article-card-tag {
  display: inline-block;
  color: #0284c7;
  font-size: 0.8125rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.article-card-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: #0c4a6e;
  line-height: 1.45;
  margin-bottom: 12px;
  transition: var(--transition);
}

.article-card:hover .article-card-title {
  color: #0284c7;
}

.article-card-desc {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 24px;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  border-top: 1px solid #f1f5f9;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.read-more-link {
  color: #0284c7;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.article-card:hover .read-more-link {
  color: #0369a1;
  transform: translateX(4px);
}

/* Article Detail Page Layout */
.article-detail-wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 40px 0 100px 0;
}

.article-header {
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 1.5px solid #e0f2fe;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 20px;
  font-size: 0.875rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.author-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #0c4a6e;
  font-weight: 700;
}

.author-avatar-sm {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: #fff;
  font-weight: 800;
}

/* Table of Contents (TOC) */
.article-toc {
  background: #f0f9ff;
  border: 1.5px solid #bae6fd;
  border-left: 5px solid #0284c7;
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 48px;
}

.toc-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: #0c4a6e;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
  padding: 0;
}

.toc-list li a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
}

.toc-list li a:hover {
  color: #0284c7;
  padding-left: 4px;
}

.toc-list .toc-sub {
  margin-left: 20px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* Long-Form Prose Content */
.article-body {
  font-size: 1.0625rem;
  line-height: 1.9;
  color: #335372;
}

.article-body h2 {
  font-size: 1.65rem;
  font-weight: 900;
  color: #0c4a6e;
  margin: 48px 0 20px 0;
  padding-bottom: 12px;
  border-bottom: 2px solid #e0f2fe;
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 800;
  color: #0284c7;
  margin: 32px 0 16px 0;
}

.article-body p {
  margin-bottom: 22px;
}

.article-body ul, 
.article-body ol {
  margin: 0 0 24px 28px;
  color: #335372;
}

.article-body li {
  margin-bottom: 10px;
  line-height: 1.8;
}

.article-body strong {
  color: #0c4a6e;
  font-weight: 800;
}

.article-body a {
  color: #0284c7;
  text-decoration: underline;
  text-underline-offset: 4px;
  font-weight: 600;
}

.article-body a:hover {
  color: #0369a1;
}

/* Callout Box */
.callout-box {
  background: #f0f9ff;
  border: 1.5px solid #bae6fd;
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin: 32px 0;
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.callout-box.tip {
  background: #ecfdf5;
  border-color: #a7f3d0;
}

.callout-icon {
  font-size: 1.5rem;
  line-height: 1;
  flex-shrink: 0;
}

.callout-content {
  font-size: 0.975rem;
  line-height: 1.75;
  color: #1e3a5f;
}

/* Comparison Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 36px 0;
  border-radius: var(--radius-md);
  border: 1.5px solid #e0f2fe;
  box-shadow: 0 4px 16px rgba(12, 74, 110, 0.04);
}

.prose-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9375rem;
  background: #ffffff;
}

.prose-table th {
  background: #f0f9ff;
  color: #0c4a6e;
  font-weight: 800;
  padding: 14px 18px;
  border-bottom: 2px solid #bae6fd;
  white-space: nowrap;
}

.prose-table td {
  padding: 14px 18px;
  border-bottom: 1px solid #f1f5f9;
  color: var(--text-secondary);
}

.prose-table tr:hover {
  background: #f8fcff;
}

@media (max-width: 1024px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .articles-grid {
    grid-template-columns: 1fr;
  }
}