/* ==========================================================================
   扬帆云 (Yangfan Cloud) - Pure Cloud｜纯净云境
   Palette: #FFFFFF (Pure White) + #EAF4FF (Cloud Blue) + #2563EB (Primary Blue)
   Domain: yfyuncloud.homes
   ========================================================================== */

:root {
  --color-white: #ffffff;
  --color-cloud-bg: #eaf4ff;
  --color-cloud-light: #f4f9ff;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-primary-glow: rgba(37, 99, 235, 0.28);
  --color-text-main: #0f172a;
  --color-text-muted: #475569;
  --color-text-light: #64748b;
  --color-border: #e2e8f0;
  --color-border-subtle: #edf2f7;
  --color-card-bg: #ffffff;
  --color-accent-amber: #f59e0b;
  --color-accent-emerald: #10b981;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.07), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 10px 25px -5px rgba(37, 99, 235, 0.08), 0 8px 10px -6px rgba(37, 99, 235, 0.05);
  --shadow-xl: 0 20px 35px -10px rgba(37, 99, 235, 0.12), 0 10px 15px -8px rgba(37, 99, 235, 0.06);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-white);
  color: var(--color-text-main);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

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

ul, ol {
  list-style: none;
}

button, input {
  font-family: inherit;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* Subtle background aura */
.bg-gradient-cloud {
  background: radial-gradient(circle at 50% 0%, #eaf4ff 0%, #ffffff 70%);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: var(--transition);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 42px;
  height: 42px;
  object-fit: contain;
  transition: transform 0.3s ease;
}

.brand-link:hover .brand-logo {
  transform: scale(1.05) rotate(-3deg);
}

.brand-text-wrap {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text-main);
  line-height: 1.2;
}

.brand-name span {
  color: var(--color-primary);
}

.brand-tagline-sub {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--color-text-light);
  letter-spacing: 0.05em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-item {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  padding: 6px 0;
}

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

.nav-item::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width 0.25s ease;
}

.nav-item:hover::after, .nav-item.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* Button Component */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  box-shadow: 0 4px 14px var(--color-primary-glow);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
  transform: translateY(-2px);
  color: var(--color-white);
}

.btn-secondary {
  background-color: #f8fafc;
  color: var(--color-text-main);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-cloud-bg);
  border-color: #cbd5e1;
  color: var(--color-primary);
}

.btn-glow {
  position: relative;
  overflow: hidden;
}

.btn-glow::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    60deg,
    transparent 30%,
    rgba(255, 255, 255, 0.3) 50%,
    transparent 70%
  );
  transform: rotate(30deg) translateX(-100%);
  animation: shine 4s infinite ease-in-out;
}

@keyframes shine {
  0% { transform: rotate(30deg) translateX(-150%); }
  25%, 100% { transform: rotate(30deg) translateX(150%); }
}

.btn-lg {
  padding: 14px 34px;
  font-size: 1.1rem;
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  color: var(--color-text-main);
}

.mobile-menu-drawer {
  display: none;
}


/* ==========================================================================
   Hero Section: Pure Cloud｜纯净云境
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 100px 0 120px;
  overflow: hidden;
  background: radial-gradient(circle at 50% 20%, #eaf4ff 0%, #ffffff 75%);
  text-align: center;
}

/* Floating Clouds Ambient Animations */
.cloud-ambient {
  position: absolute;
  pointer-events: none;
  z-index: 1;
  opacity: 0.65;
  filter: blur(2px);
}

.cloud-left {
  top: 15%;
  left: -60px;
  width: 480px;
  animation: floatCloudLeft 22s ease-in-out infinite alternate;
}

.cloud-right {
  top: 35%;
  right: -80px;
  width: 520px;
  animation: floatCloudRight 26s ease-in-out infinite alternate;
}

.cloud-bottom {
  bottom: -40px;
  left: 20%;
  width: 600px;
  opacity: 0.45;
  animation: floatCloudCenter 20s ease-in-out infinite alternate;
}

@keyframes floatCloudLeft {
  0% { transform: translate(0, 0) scale(1); opacity: 0.5; }
  50% { transform: translate(70px, -25px) scale(1.08); opacity: 0.8; }
  100% { transform: translate(25px, 20px) scale(0.98); opacity: 0.6; }
}

@keyframes floatCloudRight {
  0% { transform: translate(0, 0) scale(1); opacity: 0.55; }
  50% { transform: translate(-80px, 30px) scale(1.05); opacity: 0.85; }
  100% { transform: translate(-30px, -20px) scale(1.02); opacity: 0.6; }
}

@keyframes floatCloudCenter {
  0% { transform: translateY(0) scale(1); }
  100% { transform: translateY(-30px) scale(1.1); }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 860px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(191, 219, 254, 0.8);
  padding: 6px 18px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 24px;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.08);
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--color-accent-emerald);
}

/* Giant Brand Typography */
.hero-title-giant {
  font-size: 4.8rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--color-text-main);
  line-height: 1.1;
  margin-bottom: 16px;
  text-shadow: 0 8px 30px rgba(37, 99, 235, 0.1);
  background: linear-gradient(180deg, #0f172a 30%, #2563eb 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-title-sub {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.08em;
  margin-bottom: 24px;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 720px;
  margin: 0 auto 36px;
  line-height: 1.8;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-stats-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  padding-top: 24px;
  border-top: 1px solid rgba(226, 232, 240, 0.7);
  flex-wrap: wrap;
}

.hero-stat-item {
  text-align: center;
}

.hero-stat-number {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-text-main);
  line-height: 1.2;
}

.hero-stat-number span {
  color: var(--color-primary);
}

.hero-stat-label {
  font-size: 0.85rem;
  color: var(--color-text-light);
  font-weight: 500;
}

/* ==========================================================================
   Brand Manifesto / About Section
   ========================================================================== */
.brand-intro-section {
  padding: 60px 0 80px;
  background-color: var(--color-white);
  position: relative;
}

.brand-card-box {
  background: linear-gradient(135deg, #ffffff 0%, #f0f7ff 100%);
  border: 1px solid #dbeafe;
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.brand-card-box::before {
  content: "";
  position: absolute;
  top: -40px;
  right: -40px;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.brand-quote-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-motto-highlight {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 20px;
  display: inline-block;
  padding: 4px 14px;
  background: rgba(37, 99, 235, 0.08);
  border-radius: var(--radius-full);
}

.brand-intro-text {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.85;
  margin-bottom: 16px;
}

.brand-core-value {
  font-size: 1.15rem;
  font-weight: 700;
  color: #1e3a8a;
  padding: 16px 20px;
  background: rgba(255, 255, 255, 0.8);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-top: 24px;
}

/* ==========================================================================
   Section Headers (Common)
   ========================================================================== */
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-cloud-bg);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--color-text-main);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  line-height: 1.25;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   Three Core Advantages (三大核心优势)
   ========================================================================== */
.advantages-section {
  padding: 80px 0;
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.advantage-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
}

.advantage-card:hover {
  transform: translateY(-8px);
  border-color: #bfdbfe;
  box-shadow: var(--shadow-xl);
}

.advantage-icon-box {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #eaf4ff 0%, #dbeafe 100%);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  font-size: 28px;
  transition: transform 0.3s ease;
}

.advantage-card:hover .advantage-icon-box {
  transform: scale(1.1) rotate(5deg);
}

.advantage-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 12px;
}

.advantage-desc {
  font-size: 0.98rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

.advantage-features {
  margin-top: auto;
  border-top: 1px solid var(--color-border-subtle);
  padding-top: 16px;
}

.advantage-feature-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--color-text-main);
  margin-bottom: 8px;
}

.advantage-feature-item svg {
  color: var(--color-accent-emerald);
  flex-shrink: 0;
}

/* ==========================================================================
   Pricing Section (套餐价格表)
   ========================================================================== */
.pricing-section {
  padding: 100px 0;
  background-color: var(--color-white);
  position: relative;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  align-items: stretch;
}

.pricing-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: #93c5fd;
  box-shadow: var(--shadow-xl);
}

/* Featured Card Style (LV2) */
.pricing-card.featured {
  border: 2px solid var(--color-primary);
  background: linear-gradient(180deg, #ffffff 0%, #f4f9ff 100%);
  box-shadow: 0 16px 32px -8px rgba(37, 99, 235, 0.18);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-8px);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  color: var(--color-white);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
}

.pricing-plan-header {
  border-bottom: 1px solid var(--color-border-subtle);
  padding-bottom: 24px;
  margin-bottom: 24px;
}

.plan-tier-name {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 6px;
}

.plan-target-user {
  font-size: 0.88rem;
  color: var(--color-text-light);
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 18px 0 10px;
}

.price-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-text-main);
}

.price-amount {
  font-size: 3rem;
  font-weight: 900;
  color: var(--color-text-main);
  line-height: 1;
}

.pricing-card.featured .price-amount {
  color: var(--color-primary);
}

.price-cycle {
  font-size: 0.95rem;
  color: var(--color-text-light);
}

.plan-specs-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.spec-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--color-text-main);
}

.spec-item svg {
  color: var(--color-primary);
  flex-shrink: 0;
}

.spec-item strong {
  font-weight: 700;
}

.pricing-action-wrap {
  margin-top: auto;
}

.pricing-action-wrap .btn {
  width: 100%;
}

.pricing-note {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-top: 24px;
}

.pricing-image-toggle {
  margin-top: 36px;
  text-align: center;
}

.pricing-original-img {
  max-width: 820px;
  margin: 20px auto 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
}

/* ==========================================================================
   Client Compatibility Section (客户端支持)
   ========================================================================== */
.clients-section {
  padding: 80px 0;
  background-color: #f8fafc;
}

.clients-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.client-box {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 16px;
  text-align: center;
  transition: var(--transition);
}

.client-box:hover {
  transform: translateY(-4px);
  border-color: #93c5fd;
  box-shadow: var(--shadow-md);
}

.client-icon {
  font-size: 32px;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.client-os-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 4px;
}

.client-app-names {
  font-size: 0.8rem;
  color: var(--color-text-light);
}

.subscribe-tips-box {
  background: #ffffff;
  border-left: 4px solid var(--color-primary);
  padding: 20px 24px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.subscribe-tips-content {
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.subscribe-tips-content strong {
  color: var(--color-text-main);
}

/* ==========================================================================
   Six SEO Articles / Knowledge Base Section (精选专栏文章)
   ========================================================================== */
.articles-section {
  padding: 100px 0;
  background-color: var(--color-white);
}

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

.article-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: #bfdbfe;
  box-shadow: var(--shadow-lg);
}

.article-tag {
  align-self: flex-start;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-cloud-bg);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
}

.article-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-main);
  line-height: 1.45;
  margin-bottom: 12px;
  transition: color 0.2s ease;
}

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

.article-card-excerpt {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--color-border-subtle);
  padding-top: 14px;
  font-size: 0.85rem;
  color: var(--color-text-light);
}

.read-more-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--color-primary);
  font-weight: 600;
}

.read-more-link:hover {
  gap: 8px;
}

/* ==========================================================================
   User Testimonials (用户评价)
   ========================================================================== */
.testimonials-section {
  padding: 100px 0;
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
}

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

.testimonial-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.testimonial-card:hover {
  transform: translateY(-4px);
  border-color: #bfdbfe;
  box-shadow: var(--shadow-md);
}

.testimonial-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.user-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #3b82f6 0%, #1e40af 100%);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
}

.user-info {
  display: flex;
  flex-direction: column;
}

.user-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-main);
}

.user-role {
  font-size: 0.8rem;
  color: var(--color-text-light);
}

.user-stars {
  color: var(--color-accent-amber);
  margin-bottom: 12px;
  display: flex;
  gap: 3px;
}

.testimonial-text {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  flex-grow: 1;
}

.testimonial-badge {
  margin-top: 16px;
  align-self: flex-start;
  font-size: 0.75rem;
  background: #f1f5f9;
  color: #475569;
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

/* ==========================================================================
   FAQ Section (常见问题解答)
   ========================================================================== */
.faq-section {
  padding: 100px 0;
  background-color: var(--color-white);
}

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

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-white);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: #cbd5e1;
}

.faq-item.active {
  border-color: #93c5fd;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.06);
}

.faq-question {
  width: 100%;
  padding: 22px 24px;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  text-align: left;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-main);
  transition: color 0.2s ease;
}

.faq-item.active .faq-question {
  color: var(--color-primary);
}

.faq-icon {
  font-size: 1.25rem;
  color: var(--color-text-light);
  transition: transform 0.3s ease;
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  color: var(--color-primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
  color: var(--color-text-muted);
  font-size: 0.98rem;
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  max-height: 600px;
  padding: 0 24px 22px 24px;
}

/* ==========================================================================
   Bottom Final Call-to-Action
   ========================================================================== */
.final-cta-section {
  padding: 80px 0;
  background: radial-gradient(circle at 50% 50%, #eaf4ff 0%, #ffffff 80%);
  position: relative;
  text-align: center;
}

.cta-box-inner {
  max-width: 800px;
  margin: 0 auto;
  background: linear-gradient(135deg, #ffffff 0%, #eff6ff 100%);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-lg);
  padding: 56px 36px;
  box-shadow: var(--shadow-xl);
}

.cta-box-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 16px;
}

.cta-box-desc {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  margin-bottom: 32px;
}

/* ==========================================================================
   Footer & SEO Keyword Clouds
   ========================================================================== */
.site-footer {
  background-color: #0b1120;
  color: #94a3b8;
  padding: 70px 0 30px;
  border-top: 1px solid #1e293b;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-name {
  font-size: 1.4rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-brand-name img {
  width: 32px;
  height: 32px;
}

.footer-brand-desc {
  font-size: 0.9rem;
  line-height: 1.7;
  color: #94a3b8;
  margin-bottom: 20px;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 18px;
}

.footer-links-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.9rem;
}

.footer-links-list a:hover {
  color: #60a5fa;
  transform: translateX(4px);
}

/* SEO Keyword Cloud for Deep Crawling */
.footer-seo-box {
  background: #111827;
  border: 1px solid #1f2937;
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 40px;
}

.seo-box-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #e2e8f0;
  margin-bottom: 12px;
}

.seo-tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.seo-tag-link {
  font-size: 0.82rem;
  color: #94a3b8;
  background: #1f2937;
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.seo-tag-link:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.footer-bottom-bar {
  border-top: 1px solid #1e293b;
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-copy {
  color: #64748b;
}

.footer-badges {
  display: flex;
  align-items: center;
  gap: 16px;
}

.badge-pill {
  font-size: 0.75rem;
  border: 1px solid #334155;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  color: #94a3b8;
}

/* Back to Top Floating Button */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 46px;
  height: 46px;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  z-index: 99;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-4px);
  background-color: var(--color-primary-hover);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-title-giant {
    font-size: 3.6rem;
  }
  .advantages-grid, .pricing-grid, .articles-grid, .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-8px);
  }
  .clients-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu, .nav-actions .btn-secondary {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .mobile-menu-drawer {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    background: #ffffff;
    border-bottom: 1px solid var(--color-border);
    padding: 20px 24px;
    box-shadow: var(--shadow-lg);
    z-index: 99;
  }
  .mobile-menu-drawer.open {
    display: block;
  }
  .mobile-menu-drawer ul {
    display: flex;
    flex-direction: column;
    gap: 16px;
  }
  .hero-title-giant {
    font-size: 2.8rem;
  }
  .hero-title-sub {
    font-size: 1.4rem;
  }
  .advantages-grid, .pricing-grid, .articles-grid, .testimonials-grid {
    grid-template-columns: 1fr;
  }
  .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
  .brand-card-box {
    padding: 28px 20px;
  }
}