:root {
  --color-primary: #6c5ce7;
  --color-primary-dark: #5649c0;
  --color-secondary: #00cec9;
  --color-text: #2d3436;
  --color-text-light: #636e72;
  --color-bg: #ffffff;
  --color-bg-light: #f8f9fa;
  --color-dark: #1e1e2f;
  --color-dark-light: #2d2d44;
  --radius: 12px;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.05);
  --transition: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--color-text);
  line-height: 1.6;
  background-color: var(--color-bg);
}

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

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #fff;
  box-shadow: 0 6px 20px rgba(108, 92, 231, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(108, 92, 231, 0.4);
}

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

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

.btn-sm {
  padding: 8px 18px;
  font-size: 14px;
}

.btn-lg {
  padding: 14px 32px;
  font-size: 16px;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 20px;
  color: var(--color-text);
}

.brand-logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 10px;
}

.brand-name {
  font-weight: 800;
  font-size: 20px;
  color: var(--color-text);
}

.hero-brand {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.hero-brand-logo {
  width: 80px;
  height: 80px;
  object-fit: contain;
  border-radius: 18px;
  box-shadow: 0 8px 24px rgba(108, 92, 231, 0.2);
}

.hero-brand-name {
  font-size: 28px;
  font-weight: 800;
  color: var(--color-text);
}

.nav {
  display: flex;
  gap: 32px;
}

.nav a {
  font-size: 15px;
  color: var(--color-text-light);
  font-weight: 500;
  transition: var(--transition);
}

.nav a:hover {
  color: var(--color-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.lang-switcher {
  display: inline-flex;
  align-items: center;
  background: rgba(108, 92, 231, 0.08);
  border-radius: 999px;
  padding: 4px;
}

.lang-btn {
  padding: 6px 14px;
  border: none;
  border-radius: 999px;
  background: transparent;
  color: var(--color-text-light);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.lang-btn:hover {
  color: var(--color-primary);
}

.lang-btn.active {
  background: #fff;
  color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(108, 92, 231, 0.15);
}

@media (max-width: 768px) {
  .lang-btn {
    padding: 5px 10px;
    font-size: 12px;
  }

  .header-actions {
    gap: 10px;
  }
}
/* Hero */
.hero {
  padding: 140px 0 100px;
  background: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%);
  overflow: hidden;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-content h1 {
  font-size: 52px;
  line-height: 1.15;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--color-text-light);
  margin-bottom: 36px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  gap: 40px;
  list-style: none;
}

.hero-stats li {
  display: flex;
  flex-direction: column;
}

.hero-stats strong {
  font-size: 28px;
  color: var(--color-primary);
}

.hero-stats span {
  font-size: 14px;
  color: var(--color-text-light);
}

/* Player visual */
.player-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  max-width: 420px;
  margin-left: auto;
}

.player-cover {
  height: 200px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  position: relative;
}

.play-btn {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: #fff;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  cursor: pointer;
  transition: var(--transition);
}

.play-btn:hover {
  transform: scale(1.08);
}

.player-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 6px;
}

.player-meta {
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.player-wave {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 40px;
}

.player-wave span {
  width: 6px;
  background: var(--color-primary);
  border-radius: 3px;
  opacity: 0.7;
  animation: wave 1.2s ease-in-out infinite;
}

.player-wave span:nth-child(1) { height: 30%; animation-delay: 0s; }
.player-wave span:nth-child(2) { height: 60%; animation-delay: 0.1s; }
.player-wave span:nth-child(3) { height: 45%; animation-delay: 0.2s; }
.player-wave span:nth-child(4) { height: 80%; animation-delay: 0.3s; }
.player-wave span:nth-child(5) { height: 55%; animation-delay: 0.4s; }
.player-wave span:nth-child(6) { height: 70%; animation-delay: 0.5s; }
.player-wave span:nth-child(7) { height: 40%; animation-delay: 0.6s; }
.player-wave span:nth-child(8) { height: 90%; animation-delay: 0.7s; }
.player-wave span:nth-child(9) { height: 50%; animation-delay: 0.8s; }
.player-wave span:nth-child(10) { height: 65%; animation-delay: 0.9s; }

@keyframes wave {
  0%, 100% { transform: scaleY(1); }
  50% { transform: scaleY(1.5); }
}

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

.section-light {
  background-color: var(--color-bg-light);
}

.section-dark {
  background-color: var(--color-dark);
  color: #fff;
}

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

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(108, 92, 231, 0.1);
  color: var(--color-primary);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 16px;
}

.section-dark .section-tag {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-secondary);
}

.section-header h2 {
  font-size: 36px;
  margin-bottom: 16px;
}

.section-header p {
  font-size: 17px;
  color: var(--color-text-light);
}

.section-dark .section-header p {
  color: rgba(255, 255, 255, 0.7);
}

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

.about-card {
  background: #fff;
  padding: 40px 28px;
  border-radius: var(--radius);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.about-icon {
  font-size: 42px;
  margin-bottom: 16px;
}

.about-card h3 {
  font-size: 22px;
  margin-bottom: 12px;
}

.about-card p {
  color: var(--color-text-light);
  font-size: 15px;
}

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

.feature-card {
  background: #fff;
  padding: 36px 28px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  border-color: rgba(108, 92, 231, 0.2);
}

.feature-icon {
  font-size: 36px;
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(108, 92, 231, 0.08);
  border-radius: 14px;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--color-text-light);
  font-size: 15px;
}

/* Solutions */
.solution-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.solution-item {
  display: flex;
  gap: 24px;
  background: #fff;
  padding: 36px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.solution-item:hover {
  box-shadow: var(--shadow);
}

.solution-number {
  font-size: 36px;
  font-weight: 800;
  color: var(--color-primary);
  opacity: 0.3;
  line-height: 1;
}

.solution-body h3 {
  font-size: 20px;
  margin-bottom: 10px;
}

.solution-body p {
  color: var(--color-text-light);
  font-size: 15px;
}

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

.case-card {
  background: #fff;
  padding: 36px 28px;
  border-radius: var(--radius);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.case-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
}

.case-logo {
  font-size: 48px;
  margin-bottom: 16px;
}

.case-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.case-card p {
  color: var(--color-text-light);
  font-size: 15px;
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 48px;
  align-items: start;
}

.contact-info {
  display: grid;
  gap: 20px;
}

.contact-item {
  background: var(--color-dark-light);
  padding: 24px;
  border-radius: var(--radius);
}

.contact-item strong {
  display: block;
  font-size: 14px;
  color: var(--color-secondary);
  margin-bottom: 6px;
}

.contact-item span {
  font-size: 16px;
}

.contact-form {
  background: #fff;
  padding: 36px;
  border-radius: var(--radius);
  display: grid;
  gap: 20px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-field {
  display: grid;
  gap: 8px;
}

.form-field span {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.form-field input,
.form-field textarea {
  padding: 12px 16px;
  border: 1px solid #dfe6e9;
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  transition: var(--transition);
}

.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.1);
}

.contact-form button {
  width: 100%;
  border: none;
}

/* Footer */
.site-footer {
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.6);
  padding: 28px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a:hover {
  color: #fff;
}

/* Responsive */
@media (max-width: 992px) {
  .hero-inner,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .player-card {
    margin: 0 auto;
  }

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

  .solution-list {
    grid-template-columns: 1fr;
  }
}

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

  .hero-content h1 {
    font-size: 36px;
  }

  .hero-brand-logo {
    width: 56px;
    height: 56px;
  }

  .hero-brand-name {
    font-size: 22px;
  }

  .hero-stats {
    gap: 24px;
  }

  .about-grid,
  .feature-grid,
  .case-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

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