:root {
  --primary-color: #2F6BFF;
  --secondary-color: #6FA3FF;
  --button-gradient: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%);
  --card-bg: #FFFFFF;
  --page-bg: #F4F7FB;
  --text-main: #1F2D3D;
  --text-black: #000000;
  --border-color: #D6E2FF;
  --glow-color: #A5C4FF;
}

.page-su-kien {
  font-family: 'Arial', sans-serif;
  background-color: var(--page-bg);
  color: var(--text-main);
  line-height: 1.6;
}

.page-su-kien__section {
  padding: 60px 20px;
  margin-bottom: 20px;
}

.page-su-kien__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

.page-su-kien__main-title {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 700;
  color: #FFFFFF;
  text-align: center;
  margin-bottom: 20px;
  line-height: 1.2;
}

.page-su-kien__section-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  color: var(--text-main);
  text-align: center;
  margin-bottom: 40px;
  position: relative;
}

.page-su-kien__section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background-color: var(--primary-color);
  margin: 15px auto 0;
  border-radius: 2px;
}

.page-su-kien__sub-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  color: var(--text-main);
  margin-top: 40px;
  margin-bottom: 20px;
  line-height: 1.3;
}

.page-su-kien__description {
  font-size: 1.1rem;
  color: #f0f0f0;
  text-align: center;
  max-width: 800px;
  margin: 0 auto 30px;
}

.page-su-kien__text-block {
  font-size: 1rem;
  margin-bottom: 20px;
  line-height: 1.7;
  color: var(--text-main);
}

.page-su-kien__text-block a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
}

.page-su-kien__text-block a:hover {
  text-decoration: underline;
}

/* Hero Section */
.page-su-kien__hero-section {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 500px;
  color: #fff;
  text-align: center;
  padding: 10px 0 80px; /* Adjust top padding as needed, relying on body for header offset */
  overflow: hidden;
}

.page-su-kien__hero-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

.page-su-kien__hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.7);
}

.page-su-kien__hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  padding: 0 15px;
}

.page-su-kien__cta-button {
  display: inline-block;
  background: var(--button-gradient);
  color: #FFFFFF;
  padding: 15px 30px;
  border-radius: 8px;
  text-decoration: none;
  font-size: 1.1rem;
  font-weight: 700;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  border: none;
  cursor: pointer;
}

.page-su-kien__cta-button:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
  opacity: 0.9;
}

.page-su-kien__cta-button--bottom {
  margin-top: 40px;
}

/* Event Cards */
.page-su-kien__events-grid, .page-su-kien__past-events-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 30px;
}

.page-su-kien__event-card, .page-su-kien__past-event-card {
  background-color: var(--card-bg);
  border-radius: 10px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
}

.page-su-kien__event-card:hover, .page-su-kien__past-event-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.page-su-kien__card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}

.page-su-kien__card-content {
  padding: 25px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.page-su-kien__card-title {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 10px;
  line-height: 1.4;
}

.page-su-kien__card-title a {
  color: var(--text-main);
  text-decoration: none;
}

.page-su-kien__card-title a:hover {
  color: var(--primary-color);
}

.page-su-kien__card-meta {
  font-size: 0.9rem;
  color: #777;
  margin-bottom: 15px;
}

.page-su-kien__card-description {
  font-size: 1rem;
  color: var(--text-main);
  margin-bottom: 20px;
  flex-grow: 1;
}

.page-su-kien__card-button {
  display: inline-block;
  background: var(--button-gradient);
  color: #FFFFFF;
  padding: 10px 20px;
  border-radius: 5px;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  transition: background-color 0.3s ease;
  align-self: flex-start;
}

.page-su-kien__card-button:hover {
  opacity: 0.9;
}

/* Tournaments List */
.page-su-kien__tournaments-list {
  display: flex;
  flex-direction: column;
  gap: 40px;
  margin-top: 30px;
}

.page-su-kien__tournament-item {
  display: flex;
  background-color: var(--card-bg);
  border-radius: 10px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

.page-su-kien__tournament-image {
  width: 40%;
  height: auto;
  object-fit: cover;
  display: block;
}

.page-su-kien__tournament-info {
  padding: 30px;
  width: 60%;
}

.page-su-kien__tournament-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 15px;
  line-height: 1.3;
}

.page-su-kien__tournament-title a {
  color: var(--text-main);
  text-decoration: none;
}

.page-su-kien__tournament-title a:hover {
  color: var(--primary-color);
}

.page-su-kien__tournament-date, .page-su-kien__tournament-prize, .page-su-kien__tournament-details {
  font-size: 1rem;
  color: var(--text-main);
  margin-bottom: 10px;
}

/* Why Join Section */
.page-su-kien__dark-section {
  background-color: var(--primary-color);
  color: #FFFFFF;
}

.page-su-kien__dark-section .page-su-kien__section-title {
  color: #FFFFFF;
}

.page-su-kien__dark-section .page-su-kien__section-title::after {
  background-color: var(--secondary-color);
}

.page-su-kien__features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-su-kien__feature-item {
  background-color: rgba(255, 255, 255, 0.15);
  padding: 30px;
  border-radius: 10px;
  text-align: center;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.page-su-kien__feature-title {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 15px;
  color: #FFFFFF;
}

.page-su-kien__feature-description {
  font-size: 1rem;
  color: #f0f0f0;
}

/* How To Join Section */
.page-su-kien__steps-list {
  list-style: none;
  padding: 0;
  margin-top: 30px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.page-su-kien__step-item {
  background-color: var(--card-bg);
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  border-left: 5px solid var(--primary-color);
}

.page-su-kien__step-title {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 15px;
}

.page-su-kien__step-description {
  font-size: 1rem;
  color: var(--text-main);
}

/* FAQ Section */
.page-su-kien__faq-list {
  margin-top: 40px;
}

details.page-su-kien__faq-item {
  margin-bottom: 15px;
  border-radius: 5px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  background: var(--card-bg);
}

details.page-su-kien__faq-item summary.page-su-kien__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 20px;
  cursor: pointer;
  user-select: none;
  list-style: none;
  transition: background-color 0.3s ease;
}

details.page-su-kien__faq-item summary.page-su-kien__faq-question::-webkit-details-marker {
  display: none;
}

details.page-su-kien__faq-item summary.page-su-kien__faq-question:hover {
  background: #f5f5f5;
}

.page-su-kien__faq-qtext {
  flex: 1;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  text-align: left;
  color: var(--text-main);
}

.page-su-kien__faq-toggle {
  font-size: 24px;
  font-weight: bold;
  color: var(--primary-color);
  flex-shrink: 0;
  margin-left: 15px;
  width: 28px;
  text-align: center;
}

details.page-su-kien__faq-item .page-su-kien__faq-answer {
  padding: 0 20px 20px;
  background: #f9f9f9;
  border-radius: 0 0 5px 5px;
}

.page-su-kien__faq-answer p {
  margin: 0;
  color: var(--text-main);
}

/* SEO Text Area */
.page-su-kien__seo-text-area {
  padding-top: 40px;
  padding-bottom: 60px;
}

.page-su-kien__list {
  list-style: disc;
  padding-left: 25px;
  margin-bottom: 20px;
  color: var(--text-main);
}

.page-su-kien__list li {
  margin-bottom: 10px;
  font-size: 1rem;
}

.page-su-kien__list strong {
  color: var(--primary-color);
}

/* Bottom CTA */
.page-su-kien__cta-bottom {
  text-align: center;
  padding-bottom: 80px;
}

.page-su-kien__cta-buttons-wrapper {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.page-su-kien__btn-primary {
  background: var(--button-gradient);
  color: #ffffff;
  border: none;
}

.page-su-kien__btn-secondary {
  background: #ffffff;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.page-su-kien__btn-secondary:hover {
  background: var(--primary-color);
  color: #ffffff;
}

/* Global image and button responsive styles */
.page-su-kien img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-su-kien__cta-button,
.page-su-kien__btn-primary,
.page-su-kien__btn-secondary,
.page-su-kien a[class*="button"],
.page-su-kien a[class*="btn"] {
  max-width: 100%;
  box-sizing: border-box;
  white-space: normal;
  word-wrap: break-word;
}

.page-su-kien__cta-buttons-wrapper,
.page-su-kien__button-group,
.page-su-kien__btn-container {
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  overflow: hidden;
}

/* Responsive adjustments */
@media (max-width: 1024px) {
  .page-su-kien__section {
    padding: 50px 15px;
  }

  .page-su-kien__main-title {
    font-size: clamp(2.2rem, 4.5vw, 3rem);
  }

  .page-su-kien__section-title {
    font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  }

  .page-su-kien__tournament-item {
    flex-direction: column;
  }

  .page-su-kien__tournament-image,
  .page-su-kien__tournament-info {
    width: 100%;
  }

  .page-su-kien__tournament-image {
    height: 250px;
  }

  .page-su-kien__tournament-info {
    padding: 25px;
  }
}

@media (max-width: 768px) {
  /* HERO 主图区域 */
  .page-su-kien__hero-section {
    padding: 10px 0 60px; /* 約 10px 頂距 */
    min-height: 400px;
  }
  .page-su-kien__hero-image img {
    object-fit: contain !important; /* 禁止 cover 裁切两侧 */
    aspect-ratio: unset !important;
    width: 100% !important;
    height: auto !important;
  }
  .page-su-kien__main-title {
    font-size: clamp(1.8rem, 6vw, 2.5rem);
  }
  .page-su-kien__description {
    font-size: 1rem;
  }

  /* 通用 Section 和 Container */
  .page-su-kien__section {
    padding: 40px 10px;
  }
  .page-su-kien__container {
    padding: 0 15px;
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
  }

  .page-su-kien__section-title {
    font-size: clamp(1.5rem, 5vw, 2.2rem);
    margin-bottom: 30px;
  }
  .page-su-kien__sub-title {
    font-size: clamp(1.2rem, 4vw, 1.8rem);
  }
  .page-su-kien__text-block, .page-su-kien__list li, .page-su-kien__feature-description {
    font-size: 0.95rem;
  }

  /* 产品展示图区域 (Event Cards) */
  .page-su-kien__events-grid, .page-su-kien__past-events-grid {
    grid-template-columns: 1fr; /* 单列布局 */
    gap: 25px;
    overflow-x: hidden; /* 防止横向滚动 */
  }
  .page-su-kien__event-card, .page-su-kien__past-event-card {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
  }

  /* 装饰主标题 + 长文 SEO 区 */
  .page-su-kien__seo-text-area .page-su-kien__container {
    padding-left: 15px;
    padding-right: 15px;
  }
  .page-su-kien__article-body {
    max-width: 100% !important;
    box-sizing: border-box !important;
    padding: 0 15px;
  }
  .page-su-kien__article-figure {
    text-align: center;
  }

  /* 通用图片与容器 */
  .page-su-kien img {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
  }
  .page-su-kien__card-image {
    height: 180px;
  }
  .page-su-kien__tournament-image {
    height: 200px;
  }

  /* 按钮与按钮容器 */
  .page-su-kien__cta-button,
  .page-su-kien__btn-primary,
  .page-su-kien__btn-secondary,
  .page-su-kien a[class*="button"],
  .page-su-kien__card-button,
  .page-su-kien a[class*="btn"] {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    white-space: normal !important;
    word-wrap: break-word !important;
    padding: 12px 15px;
    font-size: 1rem;
  }
  .page-su-kien__cta-buttons-wrapper {
    flex-direction: column; /* 垂直排列 */
    gap: 15px;
    padding: 0 15px;
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
  }
  .page-su-kien__card-button {
    align-self: stretch;
  }

  /* FAQ */
  details.page-su-kien__faq-item summary.page-su-kien__faq-question { padding: 15px; }
  .page-su-kien__faq-qtext { font-size: 15px; }
  details.page-su-kien__faq-item .page-su-kien__faq-answer { padding: 0 15px 15px; }

  /* Steps List */
  .page-su-kien__steps-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .page-su-kien__main-title {
    font-size: clamp(1.5rem, 7vw, 2.2rem);
  }
  .page-su-kien__section-title {
    font-size: clamp(1.3rem, 6vw, 2rem);
  }
  .page-su-kien__hero-section {
    padding-bottom: 40px;
  }
  .page-su-kien__cta-button {
    padding: 10px 20px;
    font-size: 1rem;
  }
  .page-su-kien__card-content {
    padding: 20px;
  }
  .page-su-kien__tournament-info {
    padding: 20px;
  }
  .page-su-kien__feature-item {
    padding: 25px;
  }
  .page-su-kien__step-item {
    padding: 25px;
  }
}