/* =====================================================
   HAOMIAO TECH — CORPORATE WEBSITE STYLES
   ===================================================== */

/* ---- 1. CSS Variables ---- */
:root {
  /* Colors */
  --color-bg: #07090f;
  --color-surface: #0d1117;
  --color-card: #111827;
  --color-card-alt: #161d2e;
  --color-border: rgba(56, 189, 248, 0.1);
  --color-border-hover: rgba(56, 189, 248, 0.3);
  --color-primary: #38bdf8;
  --color-primary-dark: #0284c7;
  --color-secondary: #818cf8;
  --color-accent: #34d399;
  --color-danger: #f87171;
  --color-text: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #38bdf8, #818cf8);
  --gradient-hero: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(56,189,248,0.15) 0%, transparent 60%);
  --gradient-card-glow: radial-gradient(ellipse at 50% 0%, rgba(56,189,248,0.2), transparent 70%);

  /* Typography */
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 5rem;
  --space-3xl: 7rem;

  /* Layout */
  --max-width: 1200px;
  --header-height: 72px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-card-hover: 0 12px 40px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 40px rgba(56, 189, 248, 0.15);
  --shadow-glow-hover: 0 0 60px rgba(56, 189, 248, 0.25);

  /* Transitions */
  --transition-fast: 200ms cubic-bezier(0.22, 1, 0.36, 1);
  --transition-base: 300ms cubic-bezier(0.22, 1, 0.36, 1);
  --transition-slow: 500ms cubic-bezier(0.22, 1, 0.36, 1);
  --transition-reveal: 600ms cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---- 2. Reset & Base ---- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  color: inherit;
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--color-surface);
}
::-webkit-scrollbar-thumb {
  background: rgba(56, 189, 248, 0.3);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(56, 189, 248, 0.5);
}

/* Text Selection */
::selection {
  background: rgba(56, 189, 248, 0.3);
  color: var(--color-text);
}

/* ---- 3. Layout ---- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

@media (max-width: 640px) {
  .container {
    padding: 0 var(--space-sm);
  }
}

/* ---- 4. Particle Canvas ---- */
#particleCanvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.6;
}

/* ---- 5. Fixed Header ---- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  transition: background var(--transition-base), backdrop-filter var(--transition-base), box-shadow var(--transition-base);
}

.site-header.scrolled {
  background: rgba(7, 9, 15, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: 0 1px 0 rgba(56, 189, 248, 0.08);
}

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

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  transition: opacity var(--transition-fast);
}
.logo:hover { opacity: 0.8; }

.logo-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.logo-text {
  font-size: 1.125rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 0.05em;
}

/* Navigation */
.main-nav {
  display: flex;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), background var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-base);
}

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

.nav-link.active {
  color: var(--color-primary);
}

.nav-link.active::after {
  width: 60%;
}

/* Scroll Progress */
.scroll-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: var(--gradient-primary);
  transition: width 50ms linear;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 4px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}
.hamburger:hover { background: rgba(255,255,255,0.06); }

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
  transform-origin: center;
}

.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile Overlay */
.mobile-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(7, 9, 15, 0.97);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.mobile-overlay.open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav ul {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.mobile-nav-link {
  font-size: 1.75rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
  opacity: 0;
  transform: translateY(20px);
}

.mobile-overlay.open .mobile-nav-link {
  opacity: 1;
  transform: translateY(0);
}

.mobile-overlay.open .mobile-nav li:nth-child(1) .mobile-nav-link { transition-delay: 100ms; }
.mobile-overlay.open .mobile-nav li:nth-child(2) .mobile-nav-link { transition-delay: 150ms; }
.mobile-overlay.open .mobile-nav li:nth-child(3) .mobile-nav-link { transition-delay: 200ms; }
.mobile-overlay.open .mobile-nav li:nth-child(4) .mobile-nav-link { transition-delay: 250ms; }
.mobile-overlay.open .mobile-nav li:nth-child(5) .mobile-nav-link { transition-delay: 300ms; }
.mobile-overlay.open .mobile-nav li:nth-child(6) .mobile-nav-link { transition-delay: 350ms; }

@media (max-width: 768px) {
  .main-nav { display: none; }
  .hamburger { display: flex; }
}

/* ---- 6. Hero Section ---- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--header-height) + var(--space-2xl)) var(--space-lg) var(--space-2xl);
  overflow: hidden;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(56, 189, 248, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56, 189, 248, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 20%, black 0%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 20%, black 0%, transparent 100%);
  z-index: 0;
}

.hero-bg-grid::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 860px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.2);
  font-size: 0.8125rem;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: var(--space-lg);
  letter-spacing: 0.05em;
}

.hero-badge svg {
  width: 14px;
  height: 14px;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}

.title-line {
  display: block;
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: var(--color-text-secondary);
  max-width: 640px;
  margin: 0 auto var(--space-xl);
  line-height: 1.8;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-full);
  font-size: 0.9375rem;
  font-weight: 600;
  transition: all var(--transition-base);
  cursor: pointer;
  white-space: nowrap;
}

.btn svg {
  width: 16px;
  height: 16px;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(56, 189, 248, 0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(56, 189, 248, 0.5);
}
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-border-hover);
  transform: translateY(-2px);
}

/* Hero Stats */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stat-num {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--color-border);
  align-self: center;
}

@media (max-width: 640px) {
  .stat-divider { display: none; }
  .hero-stats { gap: var(--space-md); }
}

/* Scroll Hint */
.scroll-hint {
  position: absolute;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  color: var(--color-text-muted);
  animation: bounceY 2s ease-in-out infinite;
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}
.scroll-hint:hover { opacity: 1; }
.scroll-hint svg { width: 24px; height: 24px; }

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

/* ---- 7. Section Common ---- */
section {
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-primary);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
  opacity: 0.8;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--space-sm);
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 1rem;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

.block-heading {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Reveal Animations */
.reveal-item,
.reveal-section,
.reveal-card {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-reveal), transform var(--transition-reveal);
}

.reveal-item.visible,
.reveal-section.visible,
.reveal-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-card[data-delay="1"] { transition-delay: 100ms; }
.reveal-card[data-delay="2"] { transition-delay: 200ms; }
.reveal-card[data-delay="3"] { transition-delay: 300ms; }
.reveal-card[data-delay="4"] { transition-delay: 400ms; }
.reveal-card[data-delay="5"] { transition-delay: 500ms; }

/* ---- 8. Highlights Section ---- */
.highlights {
  padding: var(--space-3xl) 0;
}

.highlights-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

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

@media (max-width: 640px) {
  .highlights-grid { grid-template-columns: 1fr; }
}

.highlight-card {
  position: relative;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  overflow: hidden;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.highlight-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-card-hover), var(--shadow-glow);
}

.highlight-card--stat {
  align-items: center;
  text-align: center;
}

.card-icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-xs);
  transition: background var(--transition-base), border-color var(--transition-base);
}

.card-icon-wrap svg {
  width: 28px;
  height: 28px;
  color: var(--color-primary);
}

.highlight-card:hover .card-icon-wrap {
  background: rgba(56, 189, 248, 0.15);
  border-color: rgba(56, 189, 248, 0.3);
}

.card-title {
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.3;
}

.card-text {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  flex: 1;
}

.card-arrow {
  color: var(--color-primary);
  transition: transform var(--transition-fast);
  display: flex;
}
.card-arrow svg { width: 18px; height: 18px; }
.highlight-card:hover .card-arrow { transform: translateX(4px); }

.card-glow {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 120px;
  background: var(--gradient-card-glow);
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}
.highlight-card:hover .card-glow { opacity: 1; }

/* Stat Ring */
.stat-ring {
  position: relative;
  width: 100px;
  height: 100px;
  margin-bottom: var(--space-xs);
}
.stat-ring svg {
  transform: rotate(-90deg);
  width: 100%;
  height: 100%;
}
.ring-bg {
  fill: none;
  stroke: rgba(56, 189, 248, 0.1);
}
.ring-fill {
  fill: none;
  stroke: url(#logoGrad);
  stroke-linecap: round;
  transition: stroke-dashoffset 1.5s ease-out;
}
.ring-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
}
.ring-num {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}
.ring-unit {
  font-size: 0.875rem;
  color: var(--color-primary);
}

/* ---- 9. AI + K12 Section ---- */
.ai-k12 {
  padding: var(--space-3xl) 0;
  position: relative;
}

.ai-k12 > .container {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

/* AI Module Cards */
.ai-modules-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

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

.ai-module-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 2rem 1.75rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  cursor: pointer;
  transition: transform 300ms ease, border-color 300ms ease, box-shadow 300ms ease;
  position: relative;
  overflow: hidden;
}

.ai-module-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 60% at 20% 20%, rgba(56,189,248,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.ai-module-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56,189,248,0.35);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4), 0 0 24px rgba(56,189,248,0.08);
}

.ai-module-card__icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: rgba(56,189,248,0.1);
  border: 1px solid rgba(56,189,248,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-bottom: 0.25rem;
}

.ai-module-card__title {
  font-size: 1.0625rem;
  font-weight: 800;
  line-height: 1.3;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.ai-module-card__desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  flex: 1;
}

.ai-module-card__footer {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 0.5rem;
  transition: gap 200ms ease;
}

.ai-module-card__footer svg { transition: transform 200ms ease; }

.ai-module-card:hover .ai-module-card__footer svg {
  transform: translateX(3px);
}

/* AI Overview Block */
.ai-block {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--color-border);
}

.ai-overview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

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

.ai-overview__visual {
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.ai-screen {
  position: relative;
  aspect-ratio: 16/10;
  overflow: hidden;
}

.ai-screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.ai-overview__visual:hover .ai-screen img {
  transform: scale(1.03);
}

.ai-screen-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(7,9,15,0.6), transparent 40%);
  display: flex;
  align-items: flex-end;
  padding: var(--space-sm);
}

.screen-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.25);
  font-size: 0.75rem;
  color: var(--color-primary);
  font-family: var(--font-mono);
}
.screen-tag svg { width: 12px; height: 12px; }

.block-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.ai-overview__text p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  font-size: 0.9375rem;
  line-height: 1.8;
}

.ai-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.ai-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: rgba(52, 211, 153, 0.08);
  border: 1px solid rgba(52, 211, 153, 0.2);
  font-size: 0.8125rem;
  color: var(--color-accent);
}
.ai-tag svg { width: 12px; height: 12px; }

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

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

@media (max-width: 640px) {
  .features-grid { grid-template-columns: 1fr; }
}

.feature-item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.feature-item:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-card-hover);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-sm);
}

.feature-icon svg {
  width: 22px;
  height: 22px;
  color: var(--color-primary);
}

.feature-item h4 {
  font-size: 0.9375rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.feature-item p {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* Tech Flow */
.tech-flow {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  flex-wrap: wrap;
  justify-content: center;
}

.tech-step {
  flex: 1;
  min-width: 160px;
  max-width: 240px;
  text-align: center;
  padding: var(--space-lg) var(--space-md);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.tech-step:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
}

.tech-step__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-sm);
}
.tech-step__icon svg { width: 24px; height: 24px; color: var(--color-primary); }

.tech-step__label {
  font-weight: 700;
  font-size: 0.9375rem;
  margin-bottom: var(--space-xs);
}

.tech-step p {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.tech-arrow {
  color: var(--color-text-muted);
  font-size: 1.25rem;
  padding-top: var(--space-lg);
  flex-shrink: 0;
}
.tech-arrow svg { width: 20px; height: 20px; }

@media (max-width: 768px) {
  .tech-arrow { display: none; }
  .tech-flow { flex-direction: column; align-items: stretch; }
  .tech-step { max-width: 100%; }
}

/* Scenarios Grid */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

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

.scenario-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  transition: transform var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

.scenario-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.scenario-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
}
.scenario-card:hover::before { opacity: 1; }

.scenario-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
}
.scenario-icon svg { width: 24px; height: 24px; color: var(--color-primary); }

.scenario-card h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.scenario-card p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* Results Grid */
.results-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

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

@media (max-width: 480px) {
  .results-grid { grid-template-columns: 1fr; }
}

.result-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.result-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
}

.result-number {
  font-family: var(--font-mono);
  font-size: 2.75rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.result-number span {
  font-size: 1.5rem;
}

.result-label {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

/* ---- 9b. AI+K12 New Sections ---- */

/* Workflow Loop */
.workflow-loop {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

@media (max-width: 900px) {
  .workflow-loop { grid-template-columns: 1fr; }
}

.loop-diagram {
  width: 100%;
  max-width: 200px;
}

.loop-arc {
  animation: loopSpin 8s linear infinite;
  transform-origin: center;
}

@keyframes loopSpin {
  from { stroke-dashoffset: 502; }
  to { stroke-dashoffset: 0; }
}

.workflow-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-sm);
}

@media (max-width: 1024px) {
  .workflow-steps { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 640px) {
  .workflow-steps { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .workflow-steps { grid-template-columns: 1fr; }
}

.wstep {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  position: relative;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.wstep:hover {
  transform: translateY(-3px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-card);
}

.wstep__num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--color-primary);
  opacity: 0.6;
  margin-bottom: 6px;
}

.wstep__icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-xs);
}
.wstep__icon svg { width: 18px; height: 18px; color: var(--color-primary); }

.wstep__body h4 {
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.wstep__body p {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Teacher Phases */
.teacher-phases {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: var(--space-sm);
  align-items: stretch;
}

@media (max-width: 900px) {
  .teacher-phases {
    grid-template-columns: 1fr;
  }
  .phase-connector { display: none; }
}

.phase-connector {
  display: flex;
  align-items: center;
  color: var(--color-text-muted);
  padding: 0 var(--space-xs);
}
.phase-connector svg { width: 20px; height: 20px; }

.phase-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.phase-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient-card-glow);
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.phase-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-card-hover);
}
.phase-card:hover::before { opacity: 1; }

.phase-card--highlight {
  border-color: rgba(56, 189, 248, 0.25);
  background: linear-gradient(135deg, rgba(56,189,248,0.05), rgba(129,140,248,0.05));
}

.phase-badge {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-primary);
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
}

.phase-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
}
.phase-icon svg { width: 22px; height: 22px; color: var(--color-primary); }

.phase-card h4 {
  font-size: 0.9375rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.phase-card p {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.phase-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.phase-tools span {
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-size: 0.6875rem;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.15);
  color: var(--color-primary);
  font-weight: 500;
}

/* Classroom Stages */
.classroom-stages {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  gap: var(--space-sm);
  align-items: stretch;
}

@media (max-width: 1024px) {
  .classroom-stages { grid-template-columns: 1fr; }
  .stage-arrow { display: none; }
}

.stage-arrow {
  display: flex;
  align-items: center;
  color: var(--color-text-muted);
  padding: 0 var(--space-xs);
}
.stage-arrow svg { width: 20px; height: 20px; }

.stage-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  position: relative;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.stage-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-card);
}

.stage-card--core {
  border-color: rgba(56, 189, 248, 0.3);
  background: linear-gradient(135deg, rgba(56,189,248,0.04), rgba(129,140,248,0.04));
}

.stage-num {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text-muted);
  opacity: 0.3;
  line-height: 1;
  margin-bottom: var(--space-sm);
}

.stage-num--star {
  color: #f59e0b;
  opacity: 1;
  font-size: 1.5rem;
}

.stage-card h4 {
  font-size: 0.9375rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
  line-height: 1.4;
}

.stage-card p {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-sm);
}

.stage-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.stage-tags span {
  padding: 2px 9px;
  border-radius: var(--radius-full);
  font-size: 0.6875rem;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.12);
  color: var(--color-primary);
}

/* Subjects Grid */
.subjects-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

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

@media (max-width: 640px) {
  .subjects-grid { grid-template-columns: 1fr; }
}

.subject-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.subject-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.subject-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-card);
}
.subject-card:hover::before { opacity: 1; }

.subject-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
}
.subject-icon svg { width: 22px; height: 22px; color: var(--color-primary); }

.subject-card h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.subject-card ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.subject-card li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.subject-card li svg {
  width: 14px;
  height: 14px;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 3px;
}

/* Implement Grid */
.implement-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
}

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

.implement-phases {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
}

.impl-phase {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
  margin-bottom: var(--space-lg);
  position: relative;
}

.impl-phase:last-child { margin-bottom: 0; }

.impl-phase__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-primary);
  flex-shrink: 0;
  margin-top: 5px;
  box-shadow: 0 0 8px rgba(56, 189, 248, 0.4);
  position: relative;
}

.impl-phase__dot::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 14px;
  width: 1px;
  height: calc(100% + var(--space-lg));
  background: var(--color-border);
  transform: translateX(-50%);
}

.impl-phase:last-child .impl-phase__dot::before { display: none; }

.impl-phase__dot--final {
  background: var(--color-accent);
  box-shadow: 0 0 8px rgba(52, 211, 153, 0.4);
}

.impl-phase__content {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.impl-phase__content strong {
  font-size: 0.9rem;
  font-weight: 700;
}

.impl-phase__content span {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.implement-guarantees {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
}

.guarantee-items {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.guarantee-item {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
  transition: transform var(--transition-fast);
}

.guarantee-item:hover { transform: translateX(4px); }

.guarantee-item > i {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-primary);
}
.guarantee-item > i svg { width: 18px; height: 18px; }

.guarantee-item strong {
  display: block;
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.guarantee-item p {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* Featured Grid (homepage simulation section) */
.featured-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

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

@media (max-width: 640px) {
  .featured-grid { grid-template-columns: repeat(2, 1fr); gap: 0.75rem; }
}

@media (max-width: 480px) {
  .featured-grid { grid-template-columns: 1fr; }
}

/* ---- VR Card (unified simulation card) ---- */
.vr-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: transform 300ms ease, border-color 300ms ease, box-shadow 300ms ease;
  position: relative;
}

.vr-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56,189,248,0.35);
  box-shadow: 0 8px 32px rgba(0,0,0,0.5), 0 0 24px rgba(56,189,248,0.08);
}

.vr-card__image {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: linear-gradient(135deg, #0d1117, #161d2e);
}

.vr-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 400ms ease;
}

.vr-card:hover .vr-card__image img {
  transform: scale(1.06);
}

.vr-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(7,9,15,0.6) 0%, transparent 50%);
  display: flex;
  align-items: flex-start;
  padding: 0.75rem;
}

.vr-card__category {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 9999px;
  font-size: 0.6875rem;
  font-weight: 600;
  background: rgba(56, 189, 248, 0.2);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: #38bdf8;
  backdrop-filter: blur(4px);
}

.vr-card__category svg { width: 10px; height: 10px; }

.vr-card__body {
  padding: 0.875rem 1rem;
}

.vr-card__name {
  font-size: 0.875rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 0.5rem;
  color: var(--color-text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.vr-card__meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.vr-card__meta-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.vr-card__meta-item svg { width: 12px; height: 12px; color: var(--color-primary); }

.vr-card__preview-hint {
  position: absolute;
  bottom: 0.875rem;
  right: 1rem;
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.6875rem;
  color: var(--color-primary);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 200ms ease, transform 200ms ease;
  pointer-events: none;
}

.vr-card__preview-hint svg { width: 12px; height: 12px; }

.vr-card:hover .vr-card__preview-hint {
  opacity: 1;
  transform: translateY(0);
}

/* ---- 10. Virtual Simulation Section ---- */
.simulation {
  padding: var(--space-3xl) 0;
}

.view-all-wrap {
  display: flex;
  justify-content: center;
  margin-top: 18px;
}

/* Filter Bar */
.filter-bar {
  display: flex;
  gap: var(--space-xs);
  margin-bottom: var(--space-xl);
  justify-content: center;
  flex-wrap: wrap;
}

.filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  background: transparent;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.filter-btn svg { width: 14px; height: 14px; }

.filter-btn:hover {
  color: var(--color-text);
  border-color: var(--color-border-hover);
}

.filter-btn.active {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 2px 12px rgba(56, 189, 248, 0.3);
}

/* Project Grid */
.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

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

@media (max-width: 640px) {
  .project-grid { grid-template-columns: 1fr; }
}

.project-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), opacity var(--transition-base);
}

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

.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-card-hover), var(--shadow-glow);
}

.project-card__image {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}

.project-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-card__image img {
  transform: scale(1.05);
}

.project-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(7,9,15,0.7), transparent 50%);
  display: flex;
  align-items: flex-start;
  padding: var(--space-sm);
}

.overlay-tag {
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  background: rgba(56, 189, 248, 0.2);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: var(--color-primary);
}

.overlay-tag--research {
  background: rgba(129, 140, 248, 0.2);
  border-color: rgba(129, 140, 248, 0.3);
  color: var(--color-secondary);
}

.project-card__body {
  padding: var(--space-lg);
}

.project-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: var(--space-sm);
}

.project-tag {
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-size: 0.6875rem;
  font-weight: 600;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.15);
  color: var(--color-primary);
}

.project-tag--research {
  background: rgba(129, 140, 248, 0.08);
  border-color: rgba(129, 140, 248, 0.15);
  color: var(--color-secondary);
}

.project-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
  line-height: 1.4;
}

.project-desc {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-md);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-primary);
  padding: 6px 0;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast), gap var(--transition-fast);
}

.project-btn svg { width: 14px; height: 14px; }

.project-btn:hover {
  border-bottom-color: var(--color-primary);
  gap: 10px;
}

.project-btn--ghost {
  color: var(--color-secondary);
}

.project-btn--ghost:hover {
  border-bottom-color: var(--color-secondary);
}

/* Filter Empty */
.filter-empty {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-2xl);
  text-align: center;
  color: var(--color-text-muted);
}

.filter-empty.visible { display: flex; }

.filter-empty svg { width: 48px; height: 48px; opacity: 0.4; }
.filter-empty p { font-size: 0.9375rem; }

/* ---- 11. Games Section ---- */
.games {
  padding: var(--space-3xl) 0;
}

.games-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.game-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.game-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-card-hover);
}

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

.game-card__visual {
  position: relative;
  overflow: hidden;
}

.game-card__screen {
  position: relative;
  height: 100%;
  min-height: 300px;
  overflow: hidden;
}

.game-card__screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.game-card:hover .game-card__screen img {
  transform: scale(1.04);
}

.game-screen-label {
  position: absolute;
  bottom: var(--space-md);
  left: var(--space-md);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(7, 9, 15, 0.8);
  backdrop-filter: blur(10px);
  border: 1px solid var(--color-border);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}
.game-screen-label svg { width: 14px; height: 14px; color: var(--color-primary); }

.game-card__info {
  padding: var(--space-xl) var(--space-lg) var(--space-xl) 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-sm);
}

@media (max-width: 768px) {
  .game-card__info { padding: var(--space-lg); }
}

.game-status {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.status-badge svg { width: 12px; height: 12px; }

.status-badge--dev {
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--color-primary);
}

.status-badge--plan {
  background: rgba(129, 140, 248, 0.1);
  border: 1px solid rgba(129, 140, 248, 0.25);
  color: var(--color-secondary);
}

.game-genre {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}
.game-genre svg { width: 12px; height: 12px; }

.game-title {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.game-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.game-features {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: var(--space-xs);
}

.game-features li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.game-features svg {
  width: 14px;
  height: 14px;
  color: var(--color-accent);
  flex-shrink: 0;
}

/* Game Progress */
.game-progress {
  margin-top: var(--space-xs);
}

.progress-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.progress-track {
  height: 6px;
  background: rgba(56, 189, 248, 0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width 1.5s ease-out;
}

.progress-fill--plan {
  background: linear-gradient(135deg, #818cf8, #c084fc);
}

/* ---- 12. About Section ---- */
.about {
  padding: var(--space-3xl) 0;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
}

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

/* About Intro */
.about-intro {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
}

.about-intro__badge {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-lg);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
}
.about-intro__badge svg { width: 28px; height: 28px; color: var(--color-primary); }

.about-intro__title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: var(--space-md);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.about-intro p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.about-values {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.value-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}
.value-item svg { width: 16px; height: 16px; color: var(--color-primary); flex-shrink: 0; }

/* Team */
.about-team {
  grid-column: 1 / -1;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

@media (max-width: 640px) {
  .team-grid { grid-template-columns: 1fr; }
}

.team-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.team-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
}

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

.team-card__avatar {
  position: relative;
  width: 100px;
  height: 100px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  border: 2px solid var(--color-border);
}

.team-card__avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.avatar-overlay {
  position: absolute;
  inset: 0;
  background: rgba(7, 9, 15, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  opacity: 0;
  transition: opacity var(--transition-base);
  border-radius: 50%;
}

.team-card:hover .avatar-overlay { opacity: 1; }

.avatar-social {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  transition: background var(--transition-fast), transform var(--transition-fast);
}
.avatar-social svg { width: 14px; height: 14px; }
.avatar-social:hover { background: rgba(56, 189, 248, 0.3); transform: scale(1.1); }

.team-name {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.team-role {
  font-size: 0.8125rem;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: var(--space-sm);
}

.team-bio {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* Contact */
.about-contact {
  grid-column: 1 / -1;
}

.contact-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

@media (max-width: 640px) {
  .contact-cards { grid-template-columns: 1fr; }
}

.contact-item {
  display: flex;
  gap: var(--space-md);
  align-items: center;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.contact-item:hover {
  transform: translateY(-2px);
  border-color: var(--color-border-hover);
}

.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.contact-icon svg { width: 20px; height: 20px; color: var(--color-primary); }

.contact-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: 2px;
  font-weight: 500;
}

.contact-value {
  font-size: 0.875rem;
  color: var(--color-text);
  font-weight: 500;
}

/* ---- 13. Footer ---- */
.site-footer {
  position: relative;
  z-index: 1;
  padding: var(--space-2xl) 0 var(--space-lg);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-xl);
}

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

.footer-brand {
  flex: 0 0 auto;
}

.footer-brand .logo {
  margin-bottom: var(--space-sm);
}

.footer-tagline {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.footer-nav {
  display: flex;
  gap: var(--space-2xl);
  flex: 1;
  flex-wrap: wrap;
}

.footer-nav-col h4 {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-nav-col li {
  margin-bottom: 10px;
}

.footer-nav-col a {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}
.footer-nav-col a:hover { color: var(--color-primary); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.footer-bottom p {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.footer-motto {
  font-family: var(--font-mono);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---- 14. Back to Top ---- */
.back-to-top {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: 900;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  box-shadow: var(--shadow-card);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: all var(--transition-base);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: rgba(56, 189, 248, 0.1);
  border-color: var(--color-border-hover);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.back-to-top svg { width: 18px; height: 18px; }

/* ---- 15. Responsive Utilities ---- */
@media (max-width: 640px) {
  .section-title { font-size: 1.75rem; }
  .hero-title { font-size: 2.25rem; }
  .hero-stats { gap: var(--space-sm); }
  .stat-num { font-size: 1.5rem; }
  .back-to-top { bottom: var(--space-sm); right: var(--space-sm); }
}

/* ---- 16. Focus Ring ---- */
:focus:not(:focus-visible) { outline: none; }

/* ---- 17. Utility Classes ---- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Section spacing between major sections */
.highlights + section,
.simulation + section,
.games + section {
  padding-top: 0;
}

/* Ensure sections alternate nicely */
section:nth-of-type(even) {
  background: rgba(13, 17, 23, 0.3);
}

/* =====================================================
   VR Case Modal
   ===================================================== */
.vr-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0,0,0,0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 300ms ease, visibility 300ms ease;
}

.vr-modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.vr-modal {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  max-width: 720px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  transform: translateY(20px) scale(0.98);
  transition: transform 300ms ease;
}

.vr-modal-overlay.open .vr-modal {
  transform: translateY(0) scale(1);
}

.vr-modal::-webkit-scrollbar { width: 6px; }
.vr-modal::-webkit-scrollbar-track { background: transparent; }
.vr-modal::-webkit-scrollbar-thumb { background: rgba(56,189,248,0.3); border-radius: 3px; }

.vr-modal__body {
  padding: 1.5rem 2rem 2rem;
}

.vr-modal__header {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.vr-modal__tag {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  margin-top: 0.2rem;
  border-radius: 9999px;
  background: rgba(56,189,248,0.12);
  border: 1px solid rgba(56,189,248,0.3);
  color: var(--color-primary);
  font-size: 0.75rem;
  font-weight: 600;
}
.vr-modal__tag svg { width: 13px; height: 13px; flex-shrink: 0; }

.vr-modal__close {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  margin-left: auto;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: background 200ms ease, color 200ms ease, border-color 200ms ease;
}
.vr-modal__close:hover {
  background: rgba(56,189,248,0.15);
  color: var(--color-primary);
  border-color: rgba(56,189,248,0.35);
}
.vr-modal__close svg { width: 18px; height: 18px; }

.vr-modal__title {
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1.35;
  margin: 0 0 1.25rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.vr-modal__meta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

.vr-modal__meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}
.vr-modal__meta-item svg { width: 14px; height: 14px; color: var(--color-primary); }
.vr-modal__meta-item strong { color: var(--color-text); }

.vr-modal__cover {
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 1.5rem;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  min-height: 200px;
  max-height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.vr-modal__cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  max-height: 380px;
}

.vr-modal__desc {
  margin-bottom: 1.5rem;
}

.vr-modal__desc-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}
.vr-modal__desc-title svg { width: 16px; height: 16px; }

.vr-modal__desc p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.8;
  margin: 0;
}

.vr-modal__features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.vr-modal__feature {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 0.75rem;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}
.vr-modal__feature svg {
  width: 14px;
  height: 14px;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.vr-modal__cta {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn-modal {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0.65rem 1.4rem;
  border-radius: 10px;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.25s ease;
}
.btn-modal svg { width: 15px; height: 15px; }

.btn-modal-primary {
  background: var(--gradient-primary);
  color: #fff;
}
.btn-modal-primary:hover {
  filter: brightness(1.12);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(56,189,248,0.35);
}

.btn-modal-secondary {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}
.btn-modal-secondary:hover {
  background: rgba(56,189,248,0.08);
  border-color: rgba(56,189,248,0.3);
  color: var(--color-primary);
}

@media (max-width: 600px) {
  .vr-modal__features { grid-template-columns: 1fr; }
  .vr-modal__cta { flex-direction: column; }
  .vr-modal__cta .btn-modal { text-align: center; justify-content: center; }
}