:root {
  --primary-color: #007bfc;
  --primary-dark: #0066d4;
  --text-color: #333;
  --light-gray: #f8f9fa;
  --medium-gray: #e9ecef;
  --dark-gray: #6c757d;
  --white: #ffffff;
  --bronze: #cd7f32;
  --silver: #c0c0c0;
  --gold: #ffd700;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

body {
  color: var(--text-color);
  line-height: 1.6;
  background-color: var(--light-gray);
}

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

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

/* Header */
header {
  background-color: var(--white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 0;
}

.logo {
  display: flex;
  align-items: center;
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary-color);
}

.logo img {
  width: 38px;
  height: 38px;
  margin-right: 10px;
}

.nav-links {
  display: flex;
  list-style: none;
}

.nav-links li {
  margin-left: 25px;
}

.nav-links a {
  color: var(--text-color);
  font-weight: 500;
  transition: color 0.3s;
}

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

.auth-buttons .btn {
  margin-left: 10px;
}

.btn {
  display: inline-block;
  padding: 8px 20px;
  border-radius: 4px;
  font-weight: 500;
  transition: all 0.3s;
  cursor: pointer;
}

.btn-outline {
  border: 1px solid var(--primary-color);
  color: var(--primary-color);
  background: transparent;
}

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

.btn-primary {
  background: var(--primary-color);
  color: var(--white);
  border: 1px solid var(--primary-color);
}

.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
}

/* Hero Section */
.hero {
  background: linear-gradient(
    135deg,
    rgba(0, 123, 252, 0.1) 0%,
    rgba(0, 123, 252, 0.05) 100%
  );
  padding: 150px 0 80px;
  text-align: center;
}

.hero h2 {
  font-size: 2.5rem;
  margin-bottom: 20px;
  color: var(--primary-color);
}

.hero p {
  font-size: 1.2rem;
  max-width: 700px;
  margin: 0 auto 30px;
  color: var(--dark-gray);
}

/* Features Section */
.section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 50px;
}

.section-title h2 {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: 15px;
}

.section-title p {
  color: var(--dark-gray);
  max-width: 700px;
  margin: 0 auto;
}

.features {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

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

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

.feature-card {
  background: var(--white);
  border-radius: 8px;
  padding: 30px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.feature-icon {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.3rem;
  margin-bottom: 15px;
}

.section-description {
  max-width: 800px;
  margin: 50px auto 0;
  text-align: center;
}

/* Stats Section */
.stats {
  background: linear-gradient(
    135deg,
    var(--primary-color) 0%,
    var(--primary-dark) 100%
  );
  color: var(--white);
  padding: 60px 0;
}

.stats-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  text-align: center;
}

.stat-item h3 {
  font-size: 2.5rem;
  margin-bottom: 10px;
}

.stat-item p {
  font-size: 1rem;
  opacity: 0.9;
}

/* Pricing Section */
.pricing-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.pricing-card {
  background: var(--white);
  border-radius: 8px;
  padding: 30px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--medium-gray);
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.pricing-card.bronze {
  border-top: 4px solid var(--bronze);
}

.pricing-card.silver {
  border-top: 4px solid var(--silver);
}

.pricing-card.gold {
  border-top: 4px solid var(--gold);
}

.pricing-card.special {
  border-top: 4px solid var(--primary-color);
}

.plan-badge {
  position: absolute;
  top: 15px;
  right: -30px;
  background: var(--primary-color);
  color: var(--white);
  padding: 5px 30px;
  transform: rotate(45deg);
  font-size: 0.8rem;
  font-weight: bold;
  width: 120px;
  text-align: center;
}

.plan-badge.bronze {
  background: var(--bronze);
}

.plan-badge.silver {
  background: var(--silver);
}

.plan-badge.gold {
  background: var(--gold);
  color: var(--text-color);
}

.plan-badge.special {
  background: var(--primary-color);
}

.pricing-card h3 {
  font-size: 1.5rem;
  margin-bottom: 15px;
  display: flex;
  align-items: center;
}

.price {
  font-size: 2rem;
  font-weight: bold;
  margin-bottom: 20px;
  color: var(--primary-color);
}

.price span {
  font-size: 1rem;
  color: var(--dark-gray);
}

.plan-features {
  list-style: none;
  margin-bottom: 30px;
}

.plan-features li {
  padding: 10px 0;
  border-bottom: 1px dashed var(--medium-gray);
  display: flex;
  align-items: center;
}

.plan-features li:last-child {
  border-bottom: none;
}

.plan-features li i {
  margin-right: 10px;
  color: var(--primary-color);
  width: 20px;
  text-align: center;
}

.plan-features .emoji {
  margin-right: 10px;
  font-size: 1.2rem;
  width: 20px;
  text-align: center;
}

.plan-footer {
  text-align: center;
}

/* More Features Section */
.more-features {
  background: var(--light-gray);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.feature-item {
  display: flex;
  margin-bottom: 30px;
}

.feature-item-icon {
  flex: 0 0 60px;
  font-size: 1.8rem;
  color: var(--primary-color);
  margin-right: 20px;
}

.feature-item-content h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

/* Platform Support Section */
.platform-icons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 30px;
  margin-top: 50px;
}

.platform-icon {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100px;
  text-align: center;
}

.platform-icon i {
  font-size: 2.5rem;
  margin-bottom: 10px;
  color: var(--primary-color);
}

/* Streaming Section */
.streaming-description {
  max-width: 800px;
  margin: 0 auto 30px;
  text-align: center;
}

.streaming-icons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 30px;
}

.streaming-icon {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100px;
  text-align: center;
}

.streaming-icon i {
  font-size: 2rem;
  margin-bottom: 10px;
  color: var(--primary-color);
}

/* Partners Section */
.iq-title-box {
  text-align: center;
  margin-bottom: 50px;
}

.iq-title {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: 15px;
}

.iq-title-desc {
  color: var(--dark-gray);
  max-width: 700px;
  margin: 0 auto;
}

.partners {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 30px;
  margin-top: 50px;
}

.partner-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 200px;
  text-align: center;
}

.partner-logo i {
  font-size: 3rem;
  margin-bottom: 15px;
  color: var(--primary-color);
}

/* Footer */
footer {
  background: #2c3e50;
  color: var(--white);
  padding: 50px 0 20px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  margin-bottom: 30px;
}

.footer-column h3 {
  font-size: 1.2rem;
  margin-bottom: 20px;
  color: var(--white);
}

.footer-links {
  list-style: none;
}

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

.footer-links a {
  color: #bdc3c7;
  transition: color 0.3s;
}

.footer-links a:hover {
  color: var(--white);
}

.copyright {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: #bdc3c7;
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
  .navbar {
    flex-direction: column;
    padding: 15px 0;
  }

  .nav-links {
    margin: 20px 0;
  }

  .nav-links li {
    margin: 0 10px;
  }

  .auth-buttons {
    margin-top: 15px;
  }

  .hero {
    padding: 120px 0 60px;
  }

  .hero h2 {
    font-size: 2rem;
  }

  .section {
    padding: 60px 0;
  }

  .pricing-cards {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 576px) {
  .nav-links {
    flex-direction: column;
    align-items: center;
  }

  .nav-links li {
    margin: 10px 0;
  }

  .hero h2 {
    font-size: 1.8rem;
  }

  .section-title h2 {
    font-size: 1.5rem;
  }
}