.page-dang-ky-dang-nhap {
  font-family: 'Arial', sans-serif;
  color: #333;
  line-height: 1.6;
  background-color: #f9f9f9;
}

.page-dang-ky-dang-nhap__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.page-dang-ky-dang-nhap__hero {
  background: linear-gradient(135deg, #FFD700 0%, #1E90FF 100%);
  color: #fff;
  padding: 100px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-dang-ky-dang-nhap__hero-title {
  font-size: 3.2em;
  margin-bottom: 20px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
  color: #fff;
}

.page-dang-ky-dang-nhap__hero-subtitle {
  font-size: 1.3em;
  margin-bottom: 40px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  color: #eee;
}

.page-dang-ky-dang-nhap__hero-actions {
  display: flex;
  justify-content: center;
  gap: 20px;
}

.page-dang-ky-dang-nhap__btn {
  display: inline-block;
  padding: 15px 30px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  transition: all 0.3s ease;
  font-size: 1.1em;
  border: none;
  cursor: pointer;
}

.page-dang-ky-dang-nhap__btn--primary {
  background-color: #FFD700; /* Gold */
  color: #1E90FF; /* Deep Blue */
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.page-dang-ky-dang-nhap__btn--primary:hover {
  background-color: #e6c200; /* Darker Gold */
  transform: translateY(-2px);
}

.page-dang-ky-dang-nhap__btn--secondary {
  background-color: #1E90FF; /* Deep Blue */
  color: #FFD700; /* Gold */
  border: 2px solid #FFD700;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.page-dang-ky-dang-nhap__btn--secondary:hover {
  background-color: #1565b3; /* Darker Deep Blue */
  border-color: #e6c200;
  transform: translateY(-2px);
}

.page-dang-ky-dang-nhap__btn--small {
  padding: 10px 20px;
  font-size: 1em;
}

.page-dang-ky-dang-nhap__btn--large {
  padding: 18px 35px;
  font-size: 1.2em;
}

.page-dang-ky-dang-nhap__section {
  padding: 80px 0;
}

.page-dang-ky-dang-nhap__section:nth-of-type(even) {
  background-color: #f0f8ff; /* Light blue tint */
}

.page-dang-ky-dang-nhap__section-title {
  font-size: 2.5em;
  color: #1E90FF; /* Deep Blue */
  text-align: center;
  margin-bottom: 40px;
  position: relative;
  padding-bottom: 15px;
}

.page-dang-ky-dang-nhap__section-title::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background-color: #FFD700; /* Gold */
  border-radius: 2px;
}

.page-dang-ky-dang-nhap__section-description {
  font-size: 1.1em;
  text-align: center;
  max-width: 900px;
  margin: 0 auto 60px auto;
  color: #555;
}

.page-dang-ky-dang-nhap__features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.page-dang-ky-dang-nhap__feature-item {
  background-color: #fff;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-dang-ky-dang-nhap__feature-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
}

.page-dang-ky-dang-nhap__feature-icon {
  width: 80px;
  height: 80px;
  margin-bottom: 20px;
  object-fit: contain;
}

.page-dang-ky-dang-nhap__feature-title {
  font-size: 1.5em;
  color: #1E90FF;
  margin-bottom: 15px;
}

.page-dang-ky-dang-nhap__step-by-step {
  display: flex;
  flex-direction: column;
  gap: 60px;
}

.page-dang-ky-dang-nhap__step-item {
  display: flex;
  align-items: center;
  gap: 40px;
  background-color: #fff;
  padding: 30px;
  border-radius: 15px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

.page-dang-ky-dang-nhap__step-item--reverse {
  flex-direction: row-reverse;
}

.page-dang-ky-dang-nhap__step-number {
  min-width: 60px;
  height: 60px;
  background-color: #FFD700; /* Gold */
  color: #1E90FF; /* Deep Blue */
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 2em;
  font-weight: bold;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.page-dang-ky-dang-nhap__step-content h3 {
  font-size: 1.8em;
  color: #1E90FF;
  margin-bottom: 15px;
}

.page-dang-ky-dang-nhap__step-content p {
  font-size: 1.05em;
  color: #555;
  margin-bottom: 15px;
}

.page-dang-ky-dang-nhap__step-image {
  width: 350px;
  height: 250px;
  object-fit: contain;
  border-radius: 10px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.page-dang-ky-dang-nhap__login-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  text-align: center;
}

.page-dang-ky-dang-nhap__login-step-item {
  background-color: #fff;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

.page-dang-ky-dang-nhap__login-step-icon {
  width: 100px;
  height: 100px;
  margin-bottom: 20px;
  object-fit: contain;
}

.page-dang-ky-dang-nhap__login-step-item h3 {
  font-size: 1.6em;
  color: #1E90FF;
  margin-bottom: 15px;
}

.page-dang-ky-dang-nhap__app-content {
  display: flex;
  align-items: center;
  gap: 50px;
  background-color: #fff;
  padding: 40px;
  border-radius: 15px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.page-dang-ky-dang-nhap__app-text {
  flex: 1;
}

.page-dang-ky-dang-nhap__app-text h3 {
  font-size: 2em;
  color: #1E90FF;
  margin-bottom: 25px;
}

.page-dang-ky-dang-nhap__app-text ol {
  list-style: decimal;
  padding-left: 25px;
  margin-bottom: 30px;
  color: #555;
}

.page-dang-ky-dang-nhap__app-text ol li {
  margin-bottom: 10px;
  font-size: 1.1em;
}

.page-dang-ky-dang-nhap__app-image-wrapper {
  flex: 0 0 400px;
  text-align: center;
}

.page-dang-ky-dang-nhap__app-image {
  max-width: 100%;
  height: auto;
  border-radius: 15px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.page-dang-ky-dang-nhap__game-categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  text-align: center;
}

.page-dang-ky-dang-nhap__game-item {
  background-color: #fff;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s ease;
}

.page-dang-ky-dang-nhap__game-item:hover {
  transform: translateY(-5px);
}

.page-dang-ky-dang-nhap__game-icon {
  width: 90px;
  height: 90px;
  margin-bottom: 20px;
  object-fit: contain;
}

.page-dang-ky-dang-nhap__game-item h3 {
  font-size: 1.5em;
  color: #1E90FF;
  margin-bottom: 10px;
}

.page-dang-ky-dang-nhap__center-btn {
  text-align: center;
  margin-top: 50px;
}

.page-dang-ky-dang-nhap__faq-accordion {
  max-width: 900px;
  margin: 0 auto;
}

.page-dang-ky-dang-nhap__faq-item {
  background-color: #fff;
  margin-bottom: 20px;
  border-radius: 12px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

.page-dang-ky-dang-nhap__faq-question {
  font-size: 1.3em;
  color: #333;
  padding: 20px 25px;
  cursor: pointer;
  position: relative;
  background-color: #fefefe;
  border-bottom: 1px solid #eee;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.page-dang-ky-dang-nhap__faq-question::after {
  content: '+';
  font-size: 1.5em;
  color: #FFD700;
  transition: transform 0.3s ease;
}

.page-dang-ky-dang-nhap__faq-question.active::after {
  content: '-';
  transform: rotate(180deg);
}

.page-dang-ky-dang-nhap__faq-answer {
  padding: 0 25px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease-out;
  background-color: #fcfcfc;
}

.page-dang-ky-dang-nhap__faq-answer p {
  padding: 15px 0;
  color: #666;
  font-size: 1.05em;
}

.page-dang-ky-dang-nhap__cta-content {
  text-align: center;
  background-color: #1E90FF; /* Deep Blue */
  color: #fff;
  padding: 60px;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.page-dang-ky-dang-nhap__cta-content .page-dang-ky-dang-nhap__section-title {
  color: #FFD700; /* Gold */
  margin-bottom: 25px;
}

.page-dang-ky-dang-nhap__cta-content .page-dang-ky-dang-nhap__section-title::after {
  background-color: #FFD700;
}

.page-dang-ky-dang-nhap__cta-content .page-dang-ky-dang-nhap__section-description {
  color: #eee;
  margin-bottom: 40px;
}

/* Responsive Design */
@media (max-width: 992px) {
  .page-dang-ky-dang-nhap__hero-title {
    font-size: 2.5em;
  }
  .page-dang-ky-dang-nhap__section-title {
    font-size: 2em;
  }
  .page-dang-ky-dang-nhap__step-item,
  .page-dang-ky-dang-nhap__step-item--reverse {
    flex-direction: column;
    text-align: center;
  }
  .page-dang-ky-dang-nhap__step-image {
    order: -1;
    margin-bottom: 30px;
    width: 100%;
    max-width: 300px;
  }
  .page-dang-ky-dang-nhap__app-content {
    flex-direction: column;
    text-align: center;
  }
  .page-dang-ky-dang-nhap__app-image-wrapper {
    flex: none;
    margin-top: 30px;
  }
  .page-dang-ky-dang-nhap__app-text ol {
    text-align: left;
  }
}

@media (max-width: 768px) {
  .page-dang-ky-dang-nhap__hero {
    padding: 80px 0;
  }
  .page-dang-ky-dang-nhap__hero-title {
    font-size: 2em;
  }
  .page-dang-ky-dang-nhap__hero-subtitle {
    font-size: 1em;
  }
  .page-dang-ky-dang-nhap__hero-actions {
    flex-direction: column;
    gap: 15px;
  }
  .page-dang-ky-dang-nhap__btn {
    width: 80%;
    max-width: 300px;
  }
  .page-dang-ky-dang-nhap__section {
    padding: 60px 0;
  }
  .page-dang-ky-dang-nhap__section-title {
    font-size: 1.8em;
  }
  .page-dang-ky-dang-nhap__section-description {
    font-size: 0.95em;
    margin-bottom: 40px;
  }
  .page-dang-ky-dang-nhap__feature-item,
  .page-dang-ky-dang-nhap__login-step-item,
  .page-dang-ky-dang-nhap__game-item {
    padding: 25px;
  }
  .page-dang-ky-dang-nhap__step-item {
    padding: 25px;
  }
  .page-dang-ky-dang-nhap__step-number {
    min-width: 50px;
    height: 50px;
    font-size: 1.8em;
  }
  .page-dang-ky-dang-nhap__faq-question {
    font-size: 1.1em;
    padding: 18px 20px;
  }
  .page-dang-ky-dang-nhap__faq-answer p {
    font-size: 0.95em;
  }
  .page-dang-ky-dang-nhap__cta-content {
    padding: 40px 20px;
  }
}

@media (max-width: 480px) {
  .page-dang-ky-dang-nhap__hero-title {
    font-size: 1.8em;
  }
  .page-dang-ky-dang-nhap__section-title {
    font-size: 1.5em;
  }
  .page-dang-ky-dang-nhap__btn {
    font-size: 1em;
    padding: 12px 25px;
  }
  .page-dang-ky-dang-nhap__app-text h3 {
    font-size: 1.5em;
  }
  .page-dang-ky-dang-nhap__app-image {
    max-width: 250px;
  }
}