:root {
  --gold: #c5a66a;
  --blue: #87ceeb;
  --green: #2e8b57;
  --red: #dc143c;
  --dark: #2c2c2c;
  --light: #fff;
  --text-main: #333;
  --text-light: #f9f9f9;
  --bg-light: #f5f5f5;
  --font-main: "Microsoft Yahei", "Helvetica Neue", Arial, sans-serif;
  --spacing-unit: 1rem;
  --border-radius: 8px;
  --transition-speed: 0.3s
}

*,
:after,
:before {
  box-sizing: border-box
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px
}

body {
  font-family: var(--font-main);
  margin: 0;
  padding: 0;
  color: var(--text-main);
  line-height: 1.7;
  background-color: var(--light)
}
main {
  background-color: var(--text-light);
}
img {
  max-width: 100%;
  height: auto;
  display: block
}

video {
  display: block;
  width: 100%
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 calc(var(--spacing-unit)*1)
}

.section-title {
  text-align: center;
  font-size: clamp(2rem, 5vw, 2.5rem);
  margin-bottom: calc(var(--spacing-unit)*3);
  color: var(--dark);
  position: relative
}

.section-title:after {
  content: "";
  width: 60px;
  height: 4px;
  background: var(--gold);
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  border-radius: 8px
}

.btn {
  display: inline-block;
  padding: 1rem 2rem;
  background: var(--gold);
  color: var(--dark);
  text-decoration: none;
  border-radius: 8px;
  font-weight: 700;
  transition: transform var(--transition-speed), box-shadow var(--transition-speed)
}

.btn:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 15px rgba(0, 0, 0, .2)
}

.header {
  background: var(--dark);
  color: var(--light);
  padding: var(--spacing-unit) calc(var(--spacing-unit)*2);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: background-color var(--transition-speed), box-shadow var(--transition-speed)
}

.header.scrolled {
  background-color: rgba(44, 44, 44, .9);
  backdrop-filter: blur(5px);
  box-shadow: 0 2px 10px rgba(0, 0, 0, .3)
}

.logo {
  display: flex;
  align-items: center;
  height: 40px;
  color: var(--gold);
  font-size: 1.5rem;
  font-weight: 700;
  text-decoration: none
}

.logo img {
  height: 100%;
  margin-right: .5rem
}

#main-nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  margin: 0;
  padding: 0
}

#main-nav a {
  color: var(--light);
  text-decoration: none;
  padding: .5rem .15rem .85rem;
  transition: color var(--transition-speed);
  font-size: 1.1rem;
  position: relative
}

#main-nav a:after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: .2rem;
  width: 0;
  height: 2px;
  background: var(--gold);
  transform: translateX(-50%);
  transition: width var(--transition-speed);
  border-radius: 8px
}

#main-nav a:before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: .05rem;
  transform: translateX(-50%);
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 4px solid var(--gold);
  opacity: 0;
  transition: opacity var(--transition-speed)
}

#main-nav a.active,
#main-nav a:hover {
  color: var(--gold)
}

#main-nav a.active:after,
#main-nav a:hover:after {
  width: 36px
}

#main-nav a.active:before,
#main-nav a:hover:before {
  opacity: 1
}

.menu-toggle {
  display: none;
  background: 0 0;
  border: none;
  cursor: pointer;
  padding: .5rem;
  z-index: 1001
}

.menu-toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background: var(--light);
  margin: 5px 0;
  transition: transform .3s, opacity .3s;
  border-radius: 8px
}

.menu-toggle.active span:first-child {
  transform: translateY(8px) rotate(45deg)
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0
}

.menu-toggle.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg)
}

.hero {
  min-height: 90vh;
  background: no-repeat 50%/cover;
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition: background-image .8s cubic-bezier(.25, .46, .45, .94);
  align-items: center;
  color: var(--light);
  text-align: center;
  padding: calc(var(--spacing-unit)*2);
  position: relative;
  overflow: hidden
}

#hero-video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0
}

#unmute-btn {
  position: absolute;
  right: 20px;
  bottom: 20px;
  z-index: 2;
  border: none;
  border-radius: 8px;
  padding: 10px 14px;
  background: rgba(0, 0, 0, .6);
  color: #fff;
  font-size: 14px;
  cursor: pointer
}

.hero-content {
  transform: translateY(-5vh)
}

.hero h1 {
  font-size: clamp(2.5rem, 8vw, 4rem);
  text-shadow: 2px 2px 8px rgba(0, 0, 0, .7);
  margin-bottom: var(--spacing-unit)
}

.hero-subtitle {
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  margin-bottom: calc(var(--spacing-unit)*3);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-unit);
  max-width: 800px;
  text-shadow: 1px 1px 4px rgba(0, 0, 0, .7)
}

.card-intro {
  background-color: var(--text-light)
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: var(--spacing-unit);
  max-width: 1200px;
  margin: 0 auto
}

.card-item {
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 8px rgba(0, 0, 0, .1);
  transition: transform var(--transition-speed), box-shadow var(--transition-speed)
}

.card-item:hover {
  transform: translateY(-8px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, .2)
}

.more-cards .card-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(var(--spacing-unit)*2)
}

.more-cards {
  padding-top: 20px
}

.more-cards .card-container .card-item {
  padding: 5px;
  background-color: #FFF;
}

.card-item img{
  width: 100%;
  height: 100%;
}
.more-cards .card-item img,
.more-cards .card-item video {
  width: 100%;
  height: 100%;
  object-fit: cover
}

.game-rules .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: calc(var(--spacing-unit)*2)
}

.game-rules .section-title {
  grid-column: 1/-1
}

.rule-section {
  padding: calc(var(--spacing-unit)*1.5);
  background: #FFF;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 8px rgba(0, 0, 0, .1);
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.rule-section:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 32px rgba(22, 22, 22, .14)
}

.rule-section.rule-section-video {
  padding: 0;
  overflow: hidden;
  display: flex
}

.rules-video-x {
  flex: 1;
  width: 100%;
  object-fit: cover
}

.rule-section h3 {
  color: var(--gold);
  font-size: 1.8rem;
  margin-top: 0;
  margin-bottom: var(--spacing-unit)
}

.rule-section ul {
  padding-left: 1.5rem;
  list-style-type: "✔ "
}

.video-intro .container {
  max-width: 1200px
}

.video-intro-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: calc(var(--spacing-unit)*1.75)
}

.video-intro-item {
  position: relative;
  background: var(--light);
  padding: calc(var(--spacing-unit)*1.1);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(22, 22, 22, 0.1);
  overflow: hidden;
  transition: transform var(--transition-speed), box-shadow var(--transition-speed), border-color var(--transition-speed)
}

.video-intro-item:hover {
  transform: translateY(-4px);
  border-color: rgba(197, 166, 106, .5);
  box-shadow: 0 14px 32px rgba(22, 22, 22, .14)
}

.video-intro-item h3 {
  margin: 0 0 calc(var(--spacing-unit)*.50);
  color: var(--gold);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: .03em
}

.video-intro-item video {
  width: 100%;
  display: block;
}

.cultural-connotations {
  background-color: var(--text-light)
}

.cultural-grid {
  max-width: 1000px;
  margin: 0 auto;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 6px 12px rgba(0, 0, 0, .1);
  padding: var(--spacing-unit);
  background-color: var(--light)
}

.cultural-grid img {
  width: 100%
}

.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: start;
  gap: calc(var(--spacing-unit)*3)
}

.contact-map iframe {
  width: 100%;
  height: 100%;
  min-height: 360px;
  border: 0;
  border-radius: var(--border-radius)
}

.contact-qrcode {
  display: flex;
  align-items: flex-end;
  justify-content: space-between
}

.contact-qrcode img {
  max-width: 90px;
  margin-right: 30%
}

footer {
  background: var(--dark);
  text-align: center;
  padding: calc(var(--spacing-unit)*2);
  margin-top: calc(var(--spacing-unit)*2)
}

footer,
footer a {
  color: var(--light)
}

footer a {
  text-decoration: none
}

footer a:hover {
  text-decoration: underline
}

@media (min-width:768px) {
  .more-cards .card-container {
    grid-template-columns: repeat(2, 1fr)
  }
}

@media (max-width:768px) {
  #main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--dark)
  }

  #main-nav.active {
    display: block
  }

  #main-nav ul {
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: var(--spacing-unit) 0
  }

  #main-nav ul li {
    width: 100%;
    text-align: center
  }

  #main-nav ul li a {
    display: block;
    padding: 1.2rem;
    border-bottom: 1px solid #444
  }

  #main-nav ul li a:before,
  #main-nav ul li a:after {
    display: none
  }

  #main-nav ul li:last-child a {
    border-bottom: none
  }

  .menu-toggle {
    display: block
  }

  .contact-container,
  .game-rules .container,
  .video-intro-grid {
    grid-template-columns: 1fr
  }

  .video-intro-item {
    padding: calc(var(--spacing-unit)*.9)
  }

  .video-intro-item h3 {
    font-size: 1.05rem
  }

  .hero {
    min-height: 30vh;
    padding: 7rem 0 0
  }

  .hero-subtitle {
    font-size: 1rem;
    gap: 2rem;
    margin-bottom: calc(var(--spacing-unit)*2.5)
  }

  .hero .btn {
    font-size: .9rem;
    padding: .2rem 1.8rem
  }

  .card-intro {
    padding: 0
  }

  .card-intro .container {
    padding: 0 calc(var(--spacing-unit)*1)
  }

  .contact-map iframe {
    height: 350px
  }
}

@media (max-width:500px) {
  .card-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: calc(var(--spacing-unit)/2)
  }
}