:root {
  --xuexu-primary: #FF6B6B;
  --xuexu-primary-hover: #E85555;
  --xuexu-primary-light: #FFD6D6;
  --xuexu-bg: #FAFAFA;
  --xuexu-surface: #FFFFFF;
  --xuexu-surface-alt: #FFF5F5;
  --xuexu-border: #F0E6E6;
  --xuexu-text: #1F2937;
  --xuexu-text-sub: #6B7280;
  --xuexu-success: #22C55E;
  --xuexu-warning: #F59E0B;
  --xuexu-danger: #EF4444;
  --xuexu-shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.06);
  --xuexu-shadow-md: 0 8px 24px rgba(0, 0, 0, 0.10);
  --xuexu-shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.14);
  --xuexu-radius-sm: 8px;
  --xuexu-radius-md: 16px;
  --xuexu-radius-lg: 24px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  background: var(--xuexu-bg);
  color: var(--xuexu-text);
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

.container {
  width: 92%;
  max-width: 1200px;
  margin: 0 auto;
}

.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;
}

/* Navigation */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--xuexu-border);
}

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

.logo {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.logo-mark {
  width: 36px;
  height: 36px;
  background: var(--xuexu-primary);
  border-radius: 10px;
  display: grid;
  place-items: center;
  color: #fff;
  flex-shrink: 0;
}

.logo-text {
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.5px;
}

.logo-sub {
  font-size: 12px;
  color: var(--xuexu-text-sub);
  font-weight: 500;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--xuexu-text-sub);
  transition: color 0.2s ease;
  position: relative;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--xuexu-primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--xuexu-primary);
  border-radius: 2px;
  transition: width 0.25s ease;
}

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

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--xuexu-text);
}

/* Hero */
.hero {
  position: relative;
  padding: 110px 0 80px;
  overflow: hidden;
  background:
    radial-gradient(circle at 80% 20%, rgba(255, 107, 107, 0.14) 0%, transparent 45%),
    radial-gradient(circle at 20% 80%, rgba(255, 107, 107, 0.10) 0%, transparent 40%),
    linear-gradient(180deg, var(--xuexu-surface-alt) 0%, var(--xuexu-bg) 100%);
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.55;
  pointer-events: none;
}

.blob-1 {
  width: 420px;
  height: 420px;
  background: rgba(255, 107, 107, 0.28);
  top: -130px;
  right: -100px;
  animation: float 8s ease-in-out infinite;
}

.blob-2 {
  width: 320px;
  height: 320px;
  background: rgba(255, 173, 173, 0.32);
  bottom: 80px;
  left: -80px;
  animation: float 10s ease-in-out infinite reverse;
}

.blob-3 {
  width: 240px;
  height: 240px;
  background: rgba(255, 214, 165, 0.35);
  top: 40%;
  right: 12%;
  animation: float 12s ease-in-out infinite 1s;
}

@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-24px) scale(1.06); }
}

.floating-cards {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}

.float-card {
  position: absolute;
  width: 160px;
  border-radius: var(--xuexu-radius-md);
  overflow: hidden;
  box-shadow: var(--xuexu-shadow-md);
  opacity: 0.85;
  animation: cardFloat 7s ease-in-out infinite;
}

.float-card img {
  width: 100%;
  height: auto;
}

.float-card-1 {
  top: 18%;
  left: 6%;
  animation-delay: 0s;
  transform: rotate(-8deg);
}

.float-card-2 {
  top: 12%;
  right: 7%;
  animation-delay: 1.5s;
  transform: rotate(6deg);
}

.float-card-3 {
  bottom: 22%;
  right: 10%;
  animation-delay: 3s;
  transform: rotate(10deg);
}

@keyframes cardFloat {
  0%, 100% { transform: translateY(0) rotate(var(--rot, 0deg)); }
  50% { transform: translateY(-16px) rotate(var(--rot, 0deg)); }
}

.float-card-1 { --rot: -8deg; }
.float-card-2 { --rot: 6deg; }
.float-card-3 { --rot: 10deg; }

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 780px;
  text-align: center;
  margin: 0 auto;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 107, 107, 0.12);
  color: var(--xuexu-primary);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 28px;
}

.hero h1 {
  font-size: clamp(38px, 6vw, 70px);
  line-height: 1.12;
  font-weight: 900;
  margin-bottom: 24px;
  letter-spacing: -1.5px;
  color: var(--xuexu-text);
}

.gradient-text {
  background: linear-gradient(90deg, var(--xuexu-primary), #FF9F6B, var(--xuexu-primary));
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: shine 4s linear infinite;
}

@keyframes shine {
  to { background-position: 200% center; }
}

.hero p {
  font-size: clamp(17px, 2.2vw, 21px);
  color: var(--xuexu-text-sub);
  max-width: 640px;
  margin: 0 auto 40px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--xuexu-radius-md);
  padding: 14px 24px;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  border: none;
}

.btn-lg {
  padding: 18px 32px;
  font-size: 17px;
}

.btn-primary {
  background: var(--xuexu-primary);
  color: #fff;
  box-shadow: 0 6px 18px rgba(255, 107, 107, 0.35);
}

.btn-primary:hover {
  background: var(--xuexu-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(255, 107, 107, 0.45);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-secondary {
  background: transparent;
  color: var(--xuexu-text);
  border: 2px solid var(--xuexu-border);
}

.btn-secondary:hover {
  background: var(--xuexu-surface-alt);
  border-color: var(--xuexu-primary);
  color: var(--xuexu-primary);
}

/* Hero stats */
.hero-stats {
  position: relative;
  z-index: 2;
  margin-top: 80px;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.stat-item {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(8px);
  border: 1px solid var(--xuexu-border);
  border-radius: var(--xuexu-radius-md);
  padding: 24px 16px;
  text-align: center;
}

.stat-number {
  font-size: 36px;
  font-weight: 900;
  color: var(--xuexu-primary);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 14px;
  color: var(--xuexu-text-sub);
  font-weight: 500;
}

/* Section base */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 64px;
}

.section-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--xuexu-primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(30px, 4.2vw, 44px);
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.2;
}

.section-desc {
  font-size: 18px;
  color: var(--xuexu-text-sub);
}

/* Vision */
.vision-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.vision-card {
  background: var(--xuexu-surface);
  border: 1px solid var(--xuexu-border);
  border-radius: var(--xuexu-radius-lg);
  padding: 36px 28px;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.vision-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--xuexu-shadow-md);
}

.vision-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 20px;
  background: var(--xuexu-surface-alt);
  border-radius: var(--xuexu-radius-md);
  display: grid;
  place-items: center;
  color: var(--xuexu-primary);
  transition: transform 0.3s ease, background 0.3s ease;
}

.vision-card:hover .vision-icon {
  transform: scale(1.1) rotate(4deg);
  background: var(--xuexu-primary-light);
}

.vision-card h3 {
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 10px;
}

.vision-card p {
  font-size: 15px;
  color: var(--xuexu-text-sub);
  line-height: 1.7;
}

.story-card {
  background: linear-gradient(135deg, var(--xuexu-surface) 0%, var(--xuexu-surface-alt) 100%);
  border: 1px solid var(--xuexu-border);
  border-radius: var(--xuexu-radius-lg);
  padding: 48px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
}

.story-content h3 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 16px;
}

.story-content p {
  font-size: 16px;
  color: var(--xuexu-text-sub);
  line-height: 1.8;
}

.story-values {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.value-item {
  background: var(--xuexu-surface);
  border: 1px solid var(--xuexu-border);
  border-radius: var(--xuexu-radius-md);
  padding: 20px 24px;
}

.value-item strong {
  display: block;
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--xuexu-text);
}

.value-item span {
  font-size: 14px;
  color: var(--xuexu-text-sub);
}

/* Games */
.games {
  background: linear-gradient(180deg, var(--xuexu-bg) 0%, var(--xuexu-surface-alt) 100%);
}

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

.game-card {
  background: var(--xuexu-surface);
  border-radius: var(--xuexu-radius-lg);
  overflow: hidden;
  box-shadow: var(--xuexu-shadow-sm);
  border: 1px solid var(--xuexu-border);
  transition:
    transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1),
    box-shadow 0.35s ease,
    border-color 0.25s ease;
  cursor: pointer;
}

.game-card:hover {
  transform: scale(1.04) rotate(1deg);
  box-shadow: var(--xuexu-shadow-md);
  border-color: var(--xuexu-primary-light);
}

@media (prefers-reduced-motion: reduce) {
  .game-card,
  .game-card * {
    transition: none !important;
    animation: none !important;
  }
}

.game-cover-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.game-cover {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--xuexu-surface-alt);
}

.game-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.game-cover::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    120deg,
    transparent 30%,
    rgba(255, 255, 255, 0.35) 50%,
    transparent 70%
  );
  transform: translateX(-100%);
  transition: transform 0.7s ease;
  z-index: 2;
  pointer-events: none;
}

.game-cover::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(31, 41, 55, 0);
  transition: background 0.35s ease;
  z-index: 1;
  pointer-events: none;
}

.game-card:hover .game-cover img {
  transform: scale(1.1);
}

.game-card:hover .game-cover::before {
  transform: translateX(100%);
}

.game-card:hover .game-cover::after {
  background: rgba(31, 41, 55, 0.18);
}

.game-cover-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.7);
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.95);
  color: var(--xuexu-primary);
  display: grid;
  place-items: center;
  opacity: 0;
  transition: opacity 0.35s ease, transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 3;
  box-shadow: var(--xuexu-shadow-md);
  pointer-events: none;
}

.game-card:hover .game-cover-icon {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.game-title a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

.game-title a:hover {
  color: var(--xuexu-primary);
}

.game-card:hover .game-title a {
  color: var(--xuexu-primary);
}

.game-body {
  padding: 28px;
}

.game-tagline {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--xuexu-primary);
  margin-bottom: 6px;
}

.game-title {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 10px;
}

.game-desc {
  font-size: 15px;
  color: var(--xuexu-text-sub);
  margin-bottom: 18px;
  line-height: 1.7;
}

.game-features {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.feature-tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--xuexu-text-sub);
  background: var(--xuexu-surface-alt);
  border: 1px solid var(--xuexu-border);
  padding: 5px 10px;
  border-radius: 999px;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1),
              background 0.25s ease,
              border-color 0.25s ease;
}

.game-card:hover .feature-tag {
  transform: translateY(-4px) scale(1.05);
  background: #fff;
  border-color: var(--xuexu-primary-light);
}

.game-card:hover .feature-tag:nth-child(1) { transition-delay: 0ms; }
.game-card:hover .feature-tag:nth-child(2) { transition-delay: 40ms; }
.game-card:hover .feature-tag:nth-child(3) { transition-delay: 80ms; }
.game-card:hover .feature-tag:nth-child(4) { transition-delay: 120ms; }

.game-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: var(--xuexu-primary);
  transition: gap 0.25s ease;
}

.game-link:hover {
  gap: 14px;
}

.game-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.game-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: var(--xuexu-radius-md);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.game-action-primary {
  background: var(--xuexu-surface-alt);
  color: var(--xuexu-primary);
  border: 1px solid var(--xuexu-border);
}

.game-action-primary:hover {
  background: var(--xuexu-primary);
  color: #fff;
  border-color: var(--xuexu-primary);
}

.game-card:focus-visible {
  outline: 3px solid var(--xuexu-primary);
  outline-offset: 3px;
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(31, 41, 55, 0.65);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal-overlay:not([hidden]) {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  position: relative;
  width: 100%;
  max-width: 560px;
  max-height: calc(100vh - 48px);
  background: var(--xuexu-surface);
  border-radius: var(--xuexu-radius-lg);
  box-shadow: var(--xuexu-shadow-lg);
  overflow: hidden;
  transform: translateY(24px) scale(0.96);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
}

.modal-overlay:not([hidden]) .modal-card {
  transform: translateY(0) scale(1);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.9);
  border: none;
  color: var(--xuexu-text);
  display: grid;
  place-items: center;
  cursor: pointer;
  z-index: 10;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.modal-close:hover {
  background: var(--xuexu-primary);
  color: #fff;
  transform: rotate(90deg);
}

.modal-cover {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--xuexu-surface-alt);
  flex-shrink: 0;
}

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

.modal-body {
  padding: 32px;
  overflow-y: auto;
}

.modal-tagline {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--xuexu-primary);
  margin-bottom: 6px;
}

.modal-title {
  font-size: 26px;
  font-weight: 800;
  margin-bottom: 16px;
}

.modal-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 18px;
}

.modal-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--xuexu-text-sub);
  background: var(--xuexu-bg);
  padding: 8px 12px;
  border-radius: var(--xuexu-radius-sm);
}

.modal-meta-item svg {
  color: var(--xuexu-warning);
}

.modal-desc {
  font-size: 15px;
  color: var(--xuexu-text-sub);
  line-height: 1.75;
  margin-bottom: 20px;
}

.modal-features {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.modal-features .feature-tag {
  background: var(--xuexu-surface-alt);
  color: var(--xuexu-text);
}

/* FAQ accordion */
.faq-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 22px 24px;
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  color: var(--xuexu-text);
  background: var(--xuexu-bg);
  border: none;
  text-align: left;
  transition: background 0.2s ease;
}

.faq-trigger:hover {
  background: var(--xuexu-surface-alt);
}

.faq-trigger svg {
  flex-shrink: 0;
  transition: transform 0.3s ease;
  color: var(--xuexu-primary);
}

.faq-item.open .faq-trigger svg {
  transform: rotate(180deg);
}

.faq-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.35s ease;
  background: var(--xuexu-bg);
}

.faq-item.open .faq-panel {
  grid-template-rows: 1fr;
}

.faq-panel > * {
  overflow: hidden;
}

.faq-panel p {
  padding: 0 24px 22px;
  font-size: 15px;
  color: var(--xuexu-text-sub);
  line-height: 1.75;
}

/* Testimonials carousel */
.testimonials-carousel {
  position: relative;
}

.testimonials-track {
  display: flex;
  gap: 24px;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.testimonials-track .testimonial-card {
  flex: 0 0 calc((100% - 48px) / 3);
  min-width: 0;
}

.carousel-controls {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 32px;
}

.carousel-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--xuexu-surface);
  border: 1px solid var(--xuexu-border);
  color: var(--xuexu-text);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.carousel-btn:hover {
  background: var(--xuexu-primary);
  border-color: var(--xuexu-primary);
  color: #fff;
}

.carousel-dots {
  display: flex;
  gap: 8px;
}

.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: var(--xuexu-border);
  cursor: pointer;
  transition: all 0.25s ease;
  padding: 0;
}

.carousel-dot.active {
  background: var(--xuexu-primary);
  transform: scale(1.2);
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 88px;
  right: 24px;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  background: var(--xuexu-surface);
  border: 1px solid var(--xuexu-border);
  border-left: 4px solid var(--xuexu-success);
  border-radius: var(--xuexu-radius-md);
  padding: 14px 18px;
  box-shadow: var(--xuexu-shadow-md);
  font-size: 14px;
  font-weight: 600;
  color: var(--xuexu-text);
  display: flex;
  align-items: center;
  gap: 10px;
  transform: translateX(120%);
  opacity: 0;
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.35s ease;
  pointer-events: auto;
  max-width: 320px;
}

.toast.show {
  transform: translateX(0);
  opacity: 1;
}

.toast svg {
  color: var(--xuexu-success);
  flex-shrink: 0;
}

/* Confetti */
.confetti {
  position: fixed;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 250;
  animation: confetti-fall 1s ease-out forwards;
}

@keyframes confetti-fall {
  0% {
    transform: translate(0, 0) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translate(var(--tx, 0), var(--ty, 120px)) rotate(720deg);
    opacity: 0;
  }
}

/* Contact actions */
.contact-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.contact-card .btn-secondary {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.5);
  color: #fff;
}

.contact-card .btn-secondary:hover {
  background: rgba(255, 255, 255, 0.25);
  border-color: #fff;
}

/* Testimonials */
.testimonial-card {
  background: var(--xuexu-surface);
  border: 1px solid var(--xuexu-border);
  border-radius: var(--xuexu-radius-lg);
  padding: 32px;
  transition: transform 0.3s ease, box-shadow 0.3s ease, opacity 0.3s ease;
}

.testimonial-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--xuexu-shadow-md);
}

.testimonial-stars {
  display: flex;
  gap: 4px;
  color: var(--xuexu-warning);
  margin-bottom: 16px;
}

.testimonial-text {
  font-size: 16px;
  line-height: 1.8;
  color: var(--xuexu-text);
  margin-bottom: 24px;
}

.testimonial-author {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.testimonial-author strong {
  font-size: 15px;
  font-weight: 700;
}

.testimonial-author span {
  font-size: 13px;
  color: var(--xuexu-text-sub);
}

/* FAQ */
.faq-section {
  background: var(--xuexu-surface);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  border: 1px solid var(--xuexu-border);
  border-radius: var(--xuexu-radius-md);
  overflow: hidden;
  background: var(--xuexu-bg);
  transition: box-shadow 0.25s ease;
}

.faq-item[open] {
  box-shadow: var(--xuexu-shadow-sm);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 24px;
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
  color: var(--xuexu-text);
}

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

.faq-item summary svg {
  flex-shrink: 0;
  transition: transform 0.3s ease;
  color: var(--xuexu-primary);
}

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

.faq-item p {
  padding: 0 24px 22px;
  font-size: 15px;
  color: var(--xuexu-text-sub);
  line-height: 1.75;
}

/* Newsletter */
.newsletter {
  background: linear-gradient(180deg, var(--xuexu-surface) 0%, var(--xuexu-bg) 100%);
  padding-bottom: 80px;
}

.newsletter-card {
  background: linear-gradient(135deg, var(--xuexu-surface-alt) 0%, var(--xuexu-surface) 100%);
  border: 1px solid var(--xuexu-border);
  border-radius: var(--xuexu-radius-lg);
  padding: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.newsletter-content {
  flex: 1 1 300px;
}

.newsletter-content h3 {
  font-size: 26px;
  font-weight: 800;
  margin-bottom: 8px;
}

.newsletter-content p {
  font-size: 15px;
  color: var(--xuexu-text-sub);
}

.newsletter-form {
  flex: 1 1 360px;
  display: flex;
  gap: 12px;
}

.newsletter-form input {
  flex: 1;
  padding: 14px 18px;
  border: 1px solid var(--xuexu-border);
  border-radius: var(--xuexu-radius-md);
  font-size: 15px;
  font-family: inherit;
  background: var(--xuexu-surface);
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.newsletter-form input:focus {
  border-color: var(--xuexu-primary);
  box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.12);
}

.newsletter-form button {
  flex-shrink: 0;
}

.newsletter-success {
  display: none;
  width: 100%;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  background: rgba(34, 197, 94, 0.1);
  color: var(--xuexu-success);
  border-radius: var(--xuexu-radius-md);
  font-weight: 600;
}

.newsletter-success.visible {
  display: flex;
}

/* Contact */
.contact-card {
  background: var(--xuexu-primary);
  border-radius: var(--xuexu-radius-lg);
  padding: 72px 48px;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.contact-card::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -80px;
  width: 300px;
  height: 300px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 50%;
}

.contact-card .section-title,
.contact-card .section-desc {
  color: #fff;
  position: relative;
  z-index: 1;
}

.contact-card .section-desc {
  opacity: 0.9;
  margin-bottom: 32px;
}

/* Footer */
.footer {
  border-top: 1px solid var(--xuexu-border);
  padding: 48px 0;
  text-align: center;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
}

.footer p {
  font-size: 14px;
  color: var(--xuexu-text-sub);
  margin-bottom: 6px;
}

.footer a {
  color: var(--xuexu-primary);
  font-weight: 500;
}

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--xuexu-surface);
  border: 1px solid var(--xuexu-border);
  color: var(--xuexu-primary);
  display: grid;
  place-items: center;
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: all 0.3s ease;
  box-shadow: var(--xuexu-shadow-md);
  z-index: 99;
}

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

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

/* Reveal animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }

/* Responsive */
@media (max-width: 1024px) {
  .floating-cards {
    display: none;
  }

  .story-card {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .nav-links {
    gap: 20px;
  }

  .vision-grid,
  .games-grid {
    grid-template-columns: 1fr;
    max-width: 560px;
    margin: 0 auto 48px;
  }

  .testimonials-track {
    gap: 0;
  }

  .testimonials-track .testimonial-card {
    flex: 0 0 100%;
    padding: 24px;
  }

  .carousel-controls {
    display: flex;
  }

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

  .menu-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--xuexu-surface);
    border-bottom: 1px solid var(--xuexu-border);
    padding: 12px 0;
    transform: translateY(-10px);
    opacity: 0;
    pointer-events: none;
    transition: all 0.25s ease;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links a {
    display: block;
    padding: 14px 24px;
    width: 100%;
  }

  .nav-links a::after {
    display: none;
  }

  .hero {
    padding: 80px 0 60px;
  }

  .section {
    padding: 72px 0;
  }

  .story-card,
  .newsletter-card {
    padding: 32px 24px;
  }

  .newsletter-form {
    flex-direction: column;
  }

  .contact-card {
    padding: 48px 24px;
  }
}

@media (max-width: 480px) {
  .logo-sub {
    display: none;
  }

  .stats-row {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .stat-number {
    font-size: 28px;
  }

  .stat-label {
    font-size: 12px;
  }
}

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