/* ============================================
   CloudTrust (云网安信) — Design System v2
   White & Blue Theme
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Color Tokens — White & Blue Theme */
  --color-accent: #0066CC;
  --color-accent-light: #3388DD;
  --color-accent-dark: #004499;
  --color-accent-glow: rgba(0, 102, 204, 0.15);

  --color-bg-primary: #FFFFFF;
  --color-bg-secondary: #F8FAFC;
  --color-bg-tertiary: #F1F5F9;
  --color-bg-card: #FFFFFF;
  --color-bg-card-hover: #FAFBFC;

  --color-text-primary: #0F172A;
  --color-text-secondary: #475569;
  --color-text-tertiary: #94A3B8;

  --color-border: #E2E8F0;
  --color-border-light: #F1F5F9;

  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;

  /* Typography */
  --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;

  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.8rem);
  --text-sm: clamp(0.85rem, 0.8rem + 0.25vw, 0.9rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.05rem);
  --text-lg: clamp(1.15rem, 1.05rem + 0.5vw, 1.3rem);
  --text-xl: clamp(1.4rem, 1.2rem + 1vw, 1.75rem);
  --text-2xl: clamp(1.8rem, 1.4rem + 2vw, 2.5rem);
  --text-3xl: clamp(2.2rem, 1.6rem + 3vw, 3.5rem);
  --text-4xl: clamp(2.8rem, 2rem + 4vw, 5rem);

  /* Spacing (4pt base) */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  /* Motion */
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast: 150ms;
  --duration-base: 300ms;
  --duration-slow: 500ms;

  /* Layout */
  --nav-height: 4.5rem;
  --container-max: 1200px;
  --container-padding: clamp(1rem, 5vw, 4rem);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-primary);
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

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

/* --- Navigation --- */
.nav-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  transition: background var(--duration-base) var(--ease-out-expo),
              box-shadow var(--duration-base) var(--ease-out-expo);
}

.nav-header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--color-border);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 600;
  font-size: var(--text-lg);
  color: var(--color-text-primary);
  z-index: 10;
}

.logo-icon {
  width: 36px;
  height: 36px;
}

.logo-img {
  height: 36px;
  width: auto;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-link {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-out-expo),
              background var(--duration-fast) var(--ease-out-expo);
  white-space: nowrap;
}

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

.nav-link.active {
  background: var(--color-bg-tertiary);
}

.nav-dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: var(--space-sm);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  min-width: 220px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--duration-base) var(--ease-out-expo),
              transform var(--duration-base) var(--ease-out-expo),
              visibility var(--duration-base);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.nav-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: background var(--duration-fast) var(--ease-out-expo),
              color var(--duration-fast) var(--ease-out-expo);
}

.dropdown-menu a:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-accent);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  z-index: 10;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: transform var(--duration-base) var(--ease-out-expo),
              opacity var(--duration-base) var(--ease-out-expo);
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--nav-height) + var(--space-3xl)) var(--container-padding) var(--space-3xl);
  overflow: hidden;
  background: linear-gradient(180deg, #F0F7FF 0%, #FFFFFF 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 102, 204, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 102, 204, 0.04) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 60% 60% at 50% 40%, black 20%, transparent 70%);
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.15;
}

.hero-glow--1 {
  width: 600px;
  height: 600px;
  background: #0066CC;
  top: -200px;
  right: -100px;
  animation: floatGlow 8s ease-in-out infinite;
}

.hero-glow--2 {
  width: 400px;
  height: 400px;
  background: #00A3E0;
  bottom: -100px;
  left: -100px;
  animation: floatGlow 10s ease-in-out infinite reverse;
}

@keyframes floatGlow {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(40px, -30px) scale(1.1); }
  66% { transform: translate(-20px, 20px) scale(0.9); }
}

.hero-particles {
  position: absolute;
  inset: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  animation: fadeInUp 800ms var(--ease-out-expo);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(8px);
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-family: var(--font-serif);
  font-size: var(--text-4xl);
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-text-primary);
  margin-bottom: var(--space-xl);
  letter-spacing: -0.02em;
}

.hero-title-line {
  display: block;
}

.hero-title-line--accent {
  background: linear-gradient(135deg, var(--color-accent-light), var(--color-accent), #004499);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-3xl);
}

.hero-stats {
  display: flex;
  gap: var(--space-2xl);
  justify-content: center;
  flex-wrap: wrap;
}

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

.stat-number {
  display: block;
  font-family: var(--font-serif);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1;
}

.stat-label {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  margin-top: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-scroll-indicator {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  animation: bounceDown 2s ease-in-out infinite;
  z-index: 1;
}

.hero-scroll-indicator svg {
  width: 20px;
  height: 20px;
}

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.75em 1.5em;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-out-expo),
              box-shadow var(--duration-fast) var(--ease-out-expo),
              background var(--duration-fast) var(--ease-out-expo),
              border-color var(--duration-fast) var(--ease-out-expo);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-accent);
  color: #FFFFFF;
  border-color: var(--color-accent);
  box-shadow: 0 4px 20px rgba(0, 102, 204, 0.2);
}

.btn--primary:hover {
  background: var(--color-accent-dark);
  box-shadow: 0 6px 24px rgba(0, 102, 204, 0.3);
  transform: translateY(-2px);
}

.btn--ghost {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text-primary);
}

.btn--ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(0, 102, 204, 0.05);
}

.btn--outline {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text-primary);
}

.btn--outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn--large {
  padding: 1em 2em;
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
}

.btn-arrow {
  width: 1.1em;
  height: 1.1em;
  transition: transform var(--duration-fast) var(--ease-out-expo);
}

.btn:hover .btn-arrow {
  transform: translateX(3px);
}

/* --- Section Header --- */
.section-header {
  text-align: center;
  margin-bottom: var(--space-4xl);
}

.section-tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
  padding: var(--space-xs) var(--space-md);
  border: 1px solid rgba(0, 102, 204, 0.2);
  border-radius: 100px;
  background: rgba(0, 102, 204, 0.05);
}

.section-title {
  font-family: var(--font-serif);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.2;
  margin-bottom: var(--space-md);
  letter-spacing: -0.01em;
}

.section-title-dot {
  color: var(--color-accent);
}

.section-desc {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 500px;
  margin: 0 auto;
}

/* --- Services Section --- */
.services {
  padding: var(--space-5xl) var(--container-padding);
  position: relative;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
  max-width: var(--container-max);
  margin: 0 auto;
}

.service-card {
  position: relative;
  padding: var(--space-2xl);
  border-radius: var(--radius-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  transition: transform var(--duration-base) var(--ease-out-expo),
              border-color var(--duration-base) var(--ease-out-expo),
              box-shadow var(--duration-base) var(--ease-out-expo);
  overflow: hidden;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
}

.service-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
}

.service-card-bg {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity var(--duration-base) var(--ease-out-expo);
  pointer-events: none;
}

.service-card[data-service="cloud"] .service-card-bg {
  background: radial-gradient(ellipse at top right, rgba(0, 102, 204, 0.06), transparent 70%);
}
.service-card[data-service="network"] .service-card-bg {
  background: radial-gradient(ellipse at top right, rgba(0, 163, 224, 0.06), transparent 70%);
}
.service-card[data-service="security"] .service-card-bg {
  background: radial-gradient(ellipse at top right, rgba(239, 68, 68, 0.04), transparent 70%);
}
.service-card[data-service="info"] .service-card-bg {
  background: radial-gradient(ellipse at top right, rgba(245, 158, 11, 0.04), transparent 70%);
}

.service-card:hover .service-card-bg {
  opacity: 1;
}

.service-card-icon {
  width: 56px;
  height: 56px;
  margin-bottom: var(--space-xl);
  color: var(--color-accent);
  position: relative;
  z-index: 1;
}

.service-card-icon svg {
  width: 100%;
  height: 100%;
}

.service-card-title {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
  position: relative;
  z-index: 1;
}

.service-card-subtitle {
  font-size: var(--text-xs);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
  position: relative;
  z-index: 1;
}

.service-card-desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-xl);
  position: relative;
  z-index: 1;
}

.service-card-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-primary);
  position: relative;
  z-index: 1;
  transition: color var(--duration-fast) var(--ease-out-expo);
}

.service-card:hover .service-card-link {
  color: var(--color-accent);
}

.link-arrow {
  transition: transform var(--duration-fast) var(--ease-out-expo);
}

.service-card:hover .link-arrow {
  transform: translateX(4px);
}

/* --- Cases Section --- */
.cases {
  padding: var(--space-5xl) var(--container-padding);
  background: var(--color-bg-secondary);
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-xl);
  max-width: var(--container-max);
  margin: 0 auto;
}

.case-card {
  display: block;
  border-radius: var(--radius-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: transform var(--duration-base) var(--ease-out-expo),
              border-color var(--duration-base) var(--ease-out-expo),
              box-shadow var(--duration-base) var(--ease-out-expo);
}

.case-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
}

.case-card-image {
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-tertiary);
  position: relative;
  overflow: hidden;
}

.case-card-image img,
.case-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.case-card-image::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity var(--duration-base) var(--ease-out-expo);
}

.case-card[data-case="gov"] .case-card-image::before {
  background: radial-gradient(ellipse at center, rgba(0, 102, 204, 0.1), transparent);
}
.case-card[data-case="mfg"] .case-card-image::before {
  background: radial-gradient(ellipse at center, rgba(0, 163, 224, 0.1), transparent);
}
.case-card[data-case="internet"] .case-card-image::before {
  background: radial-gradient(ellipse at center, rgba(245, 158, 11, 0.1), transparent);
}

.case-card:hover .case-card-image::before {
  opacity: 1;
}

.case-card-icon {
  width: 48px;
  height: 48px;
  color: var(--color-text-tertiary);
  position: relative;
  z-index: 1;
  transition: color var(--duration-base) var(--ease-out-expo);
}

.case-card:hover .case-card-icon {
  color: var(--color-accent);
}

.case-card-icon svg {
  width: 100%;
  height: 100%;
}

.case-card-body {
  padding: var(--space-xl);
}

.case-card-category {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.case-card-title {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text-primary);
  margin: var(--space-sm) 0;
}

.case-card-desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.case-card-metric {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-light);
}

.case-card-metric strong {
  color: var(--color-accent);
  font-weight: 600;
}

/* --- Partners Section --- */
.partners {
  padding: var(--space-5xl) var(--container-padding);
  overflow: hidden;
}

.partners-marquee {
  max-width: var(--container-max);
  margin: 0 auto;
  overflow: hidden;
  mask-image: linear-gradient(to right, transparent, black 15%, black 85%, transparent);
}

.partners-track {
  display: flex;
  gap: var(--space-2xl);
  animation: marquee 30s linear infinite;
  width: max-content;
}

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

.partner-item {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text-tertiary);
  white-space: nowrap;
  padding: var(--space-md) var(--space-xl);
  transition: transform var(--duration-base) var(--ease-out-expo);
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 120px;
}

.partner-item:hover {
  transform: scale(1.15) translateY(-4px);
}

.partner-item img.partner-logo-img {
  transition: transform var(--duration-base) var(--ease-out-expo);
}

.partner-item:hover img.partner-logo-img {
  transform: scale(1.1);
}

/* --- Cert Marquee --- */
.cert-marquee {
  max-width: var(--container-max);
  margin: 0 auto;
  overflow: hidden;
  mask-image: linear-gradient(to right, transparent, black 8%, black 92%, transparent);
}

.cert-track {
  display: flex;
  gap: var(--space-lg);
  animation: certScroll 60s linear infinite;
  width: max-content;
  padding: var(--space-md) 0;
}

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

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

.cert-item {
  flex-shrink: 0;
  width: 200px;
  transition: transform var(--duration-base) var(--ease-out-expo);
}

.cert-item a {
  display: block;
  text-decoration: none;
  color: inherit;
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  transition: border-color var(--duration-base) var(--ease-out-expo),
              box-shadow var(--duration-base) var(--ease-out-expo);
}

.cert-item a::after {
  content: '⬇ 点击下载';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 102, 204, 0.85);
  color: #fff;
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: var(--font-sans);
  opacity: 0;
  transition: opacity var(--duration-base) var(--ease-out-expo);
  pointer-events: none;
}

.cert-item a:hover::after {
  opacity: 1;
}

.cert-item a:hover {
  border-color: var(--color-accent);
  box-shadow: 0 8px 30px rgba(0, 102, 204, 0.2);
}

.cert-item:hover {
  transform: translateY(-6px);
}

.cert-item img {
  display: block;
  width: 100%;
  height: 150px;
  object-fit: cover;
}

.cert-label {
  display: block;
  text-align: center;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg-card);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cert-legend {
  text-align: center;
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-3xl);
}

/* --- About Preview --- */
.about-preview {
  padding: var(--space-5xl) var(--container-padding);
  background: var(--color-bg-secondary);
}

.about-preview-grid {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: center;
}

.about-preview-text {
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
}

.about-preview-features {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

.feature-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.feature-item svg {
  width: 20px;
  height: 20px;
  color: var(--color-accent);
  flex-shrink: 0;
}

.about-preview-actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.about-preview-visual {
  display: flex;
  justify-content: center;
}

.about-visual-card {
  position: relative;
  padding: var(--space-2xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 360px;
}

.visual-card-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.visual-stat {
  text-align: center;
}

.visual-stat-number {
  display: block;
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
}

.visual-stat-label {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  margin-top: var(--space-xs);
}

.visual-divider {
  height: 1px;
  background: var(--color-border);
}

.visual-card-glow {
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, rgba(0, 102, 204, 0.15), transparent 40%, transparent 60%, rgba(0, 163, 224, 0.1));
  z-index: -1;
  opacity: 0;
  transition: opacity var(--duration-slow) var(--ease-out-expo);
}

.about-visual-card:hover .visual-card-glow {
  opacity: 1;
}

/* --- CTA Section --- */
.cta {
  position: relative;
  padding: var(--space-5xl) var(--container-padding);
  text-align: center;
  overflow: hidden;
  background: linear-gradient(180deg, #FFFFFF 0%, #F0F7FF 100%);
}

.cta-content {
  position: relative;
  z-index: 1;
  max-width: 600px;
  margin: 0 auto;
}

.cta-title {
  font-family: var(--font-serif);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
  line-height: 1.2;
}

.cta-desc {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2xl);
}

.cta-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

.cta-bg {
  position: absolute;
  inset: 0;
}

.cta-glow {
  position: absolute;
  width: 500px;
  height: 500px;
  background: var(--color-accent);
  filter: blur(150px);
  opacity: 0.06;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.cta-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 102, 204, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 102, 204, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
}

/* --- Footer --- */
.footer {
  padding: var(--space-4xl) var(--container-padding) var(--space-xl);
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
}

.footer-container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(4, 1fr);
  gap: var(--space-2xl);
  margin-bottom: var(--space-3xl);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 600;
  font-size: var(--text-lg);
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.footer-logo .logo-img {
  height: 32px;
  width: auto;
}

.footer-desc {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

.footer-col h4 {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
}

.footer-col a,
.footer-col p {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-sm);
  transition: color var(--duration-fast) var(--ease-out-expo);
  line-height: 1.6;
}

.footer-col a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

.footer-bottom a {
  color: var(--color-text-tertiary);
  transition: color var(--duration-fast);
}

.footer-bottom a:hover {
  color: var(--color-accent);
}

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

.fade-in-up {
  animation: fadeInUp 600ms var(--ease-out-expo) forwards;
}

/* Staggered card animations */
.service-card,
.case-card {
  opacity: 0;
  animation: fadeInUp 600ms var(--ease-out-expo) forwards;
}

.service-card:nth-child(1) { animation-delay: 100ms; }
.service-card:nth-child(2) { animation-delay: 200ms; }
.service-card:nth-child(3) { animation-delay: 300ms; }
.service-card:nth-child(4) { animation-delay: 400ms; }

.case-card:nth-child(1) { animation-delay: 100ms; }
.case-card:nth-child(2) { animation-delay: 200ms; }
.case-card:nth-child(3) { animation-delay: 300ms; }

/* --- Sub Pages Common --- */
.page-header {
  padding: calc(var(--nav-height) + var(--space-4xl)) var(--container-padding) var(--space-3xl);
  text-align: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, #F0F7FF 0%, #FFFFFF 100%);
}

.page-header-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(0, 102, 204, 0.08), transparent 60%);
}

.page-header .section-tag {
  position: relative;
  z-index: 1;
}

.page-header .section-title {
  position: relative;
  z-index: 1;
}

.page-content {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding) var(--space-5xl);
}

/* Service Detail */
.service-detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-4xl);
}

.detail-card {
  padding: var(--space-2xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--duration-base) var(--ease-out-expo),
              box-shadow var(--duration-base) var(--ease-out-expo);
}

.detail-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
}

.detail-card-icon {
  width: 44px;
  height: 44px;
  color: var(--color-accent);
  margin-bottom: var(--space-lg);
}

.detail-card-icon svg {
  width: 100%;
  height: 100%;
}

.detail-card h3 {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.detail-card p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.detail-card ul {
  list-style: none;
  padding: 0;
}

.detail-card ul li {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  padding: var(--space-xs) 0;
  padding-left: var(--space-lg);
  position: relative;
}

.detail-card ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* Highlight Box */
.highlight-box {
  padding: var(--space-2xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4xl);
  position: relative;
  overflow: hidden;
}

.highlight-box::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top left, rgba(0, 102, 204, 0.06), transparent 60%);
  pointer-events: none;
}

.highlight-box h3 {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
  position: relative;
}

.highlight-box p,
.highlight-box li {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  position: relative;
}

.highlight-box ul {
  list-style: none;
  padding: 0;
}

.highlight-box ul li {
  padding: var(--space-xs) 0;
  padding-left: var(--space-lg);
  position: relative;
}

.highlight-box ul li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

/* Case Detail */
.case-detail-header {
  margin-bottom: var(--space-3xl);
}

.case-client {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
}

.case-meta {
  display: flex;
  gap: var(--space-2xl);
  flex-wrap: wrap;
  margin-bottom: var(--space-xl);
}

.case-meta-item {
  text-align: center;
}

.case-meta-item .label {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.case-meta-item .value {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-accent);
}

.case-section {
  margin-bottom: var(--space-2xl);
}

.case-section h3 {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.case-section p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* Career Page */
.job-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.job-card {
  padding: var(--space-2xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--duration-base) var(--ease-out-expo);
}

.job-card:hover {
  border-color: var(--color-accent);
}

.job-card h3 {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.job-card h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: var(--space-lg) 0 var(--space-sm);
}

.job-card p,
.job-card li {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.job-card ul {
  list-style: none;
  padding: 0;
}

.job-card ul li {
  padding: var(--space-xs) 0;
  padding-left: var(--space-lg);
  position: relative;
}

.job-card ul li::before {
  content: '•';
  position: absolute;
  left: var(--space-xs);
  color: var(--color-accent);
}

/* Contact Section */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-4xl);
}

.contact-card {
  padding: var(--space-2xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: border-color var(--duration-base) var(--ease-out-expo),
              box-shadow var(--duration-base) var(--ease-out-expo);
}

.contact-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
}

.contact-card-icon {
  width: 48px;
  height: 48px;
  color: var(--color-accent);
  margin: 0 auto var(--space-md);
}

.contact-card-icon svg {
  width: 100%;
  height: 100%;
}

.contact-card h3 {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.contact-card p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* Partners Detail */
.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-lg);
}

.partner-card {
  padding: var(--space-xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 120px;
  transition: border-color var(--duration-base) var(--ease-out-expo),
              transform var(--duration-base) var(--ease-out-expo),
              box-shadow var(--duration-base) var(--ease-out-expo);
}

.partner-card img.partner-logo-img {
  transition: transform var(--duration-base) var(--ease-out-expo);
}

.partner-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.1);
}

.partner-card:hover img.partner-logo-img {
  transform: scale(1.12);
}

/* --- Blog Page --- */
.blog-header {
  padding: calc(var(--nav-height) + var(--space-4xl)) var(--container-padding) var(--space-3xl);
  text-align: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, #F0F7FF 0%, #FFFFFF 100%);
}

.blog-header-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(0, 102, 204, 0.08), transparent 60%);
}

.blog-filters {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: var(--space-2xl);
  position: relative;
  z-index: 1;
}

.blog-filter-btn {
  padding: var(--space-sm) var(--space-lg);
  border-radius: 100px;
  border: 1px solid var(--color-border);
  background: var(--color-bg-primary);
  color: var(--color-text-secondary);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out-expo);
}

.blog-filter-btn:hover,
.blog-filter-btn.active {
  background: var(--color-accent);
  color: #FFFFFF;
  border-color: var(--color-accent);
}

.blog-search {
  max-width: 400px;
  margin: 0 auto var(--space-2xl);
  position: relative;
  z-index: 1;
}

.blog-search-input {
  width: 100%;
  padding: var(--space-md) var(--space-xl);
  padding-left: 2.5rem;
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  transition: border-color var(--duration-fast);
}

.blog-search-input:focus {
  outline: none;
  border-color: var(--color-accent);
}

.blog-search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-tertiary);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-xl);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding) var(--space-5xl);
}

.blog-card {
  display: block;
  border-radius: var(--radius-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: transform var(--duration-base) var(--ease-out-expo),
              border-color var(--duration-base) var(--ease-out-expo),
              box-shadow var(--duration-base) var(--ease-out-expo);
}

.blog-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
}

.blog-card-image {
  height: 180px;
  background: var(--color-bg-tertiary);
  position: relative;
  overflow: hidden;
}

.blog-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out-expo);
}

.blog-card:hover .blog-card-image img {
  transform: scale(1.05);
}

.blog-card-body {
  padding: var(--space-xl);
}

.blog-card-tags {
  display: flex;
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
  flex-wrap: wrap;
}

.blog-card-tag {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-accent);
  background: rgba(0, 102, 204, 0.08);
  padding: 2px 8px;
  border-radius: 4px;
}

.blog-card-title {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
  line-height: 1.4;
}

.blog-card-excerpt {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-card-meta {
  display: flex;
  gap: var(--space-md);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-light);
}

.blog-card.hidden {
  display: none;
}

/* Blog Detail */
.blog-detail {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--container-padding) var(--space-5xl);
}

.blog-detail-header {
  margin-bottom: var(--space-3xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid var(--color-border);
}

.blog-detail-title {
  font-family: var(--font-serif);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
  line-height: 1.3;
}

.blog-detail-meta {
  display: flex;
  gap: var(--space-md);
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

.blog-detail-content {
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--color-text-secondary);
}

.blog-detail-content h2 {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text-primary);
  margin: var(--space-2xl) 0 var(--space-md);
}

.blog-detail-content p {
  margin-bottom: var(--space-lg);
}

.blog-detail-content ul {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
}

.blog-detail-content li {
  margin-bottom: var(--space-sm);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .about-preview-grid {
    grid-template-columns: 1fr;
    gap: var(--space-3xl);
  }

  .about-preview-visual {
    order: -1;
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--color-bg-primary);
    flex-direction: column;
    align-items: flex-start;
    padding: calc(var(--nav-height) + var(--space-xl)) var(--space-xl) var(--space-xl);
    gap: var(--space-sm);
    transition: right var(--duration-base) var(--ease-out-expo);
    border-left: 1px solid var(--color-border);
    overflow-y: auto;
  }

  .nav-links.open {
    right: 0;
  }

  .nav-toggle {
    display: flex;
  }

  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    background: transparent;
    border: none;
    padding: 0 0 0 var(--space-lg);
    margin-top: 0;
  }

  .hero-stats {
    gap: var(--space-xl);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }

  .case-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }

  .blog-filters {
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: var(--space-sm);
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .services-grid,
  .cases-grid,
  .blog-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .cta-actions {
    flex-direction: column;
    align-items: center;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}