* {
  padding: 0;
  margin: 0;
}
body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  color: #333;
  background-color: #e6f0fa;
  background-image: linear-gradient(135deg, #e6f0fa 0%, #d4e6f1 100%);
  /* 核心：单词太长时自动在单词内断行（最常用） */
  word-wrap: break-word;
  /* 兼容：允许在单词中间断开 */
  word-break: break-all;
  word-break: keep-all;
  line-height: 1.6;
}
table {
  width: 100%;
}
table td {
  border: 1px solid #ccc;
  padding: 6px;
  box-sizing: border-box;
}
.gray {
  background-color: #ccc;
}
.bold {
  font-weight: bold;
}
.table-time {
  width: 200px;
}
.header-banner {
  margin: 0;
  padding: 0;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-banner img {
  width: 100%;
  max-height: 400px;
  object-fit: cover;
  display: block;
}

nav {
  background-color: #333;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  display: flex;
  justify-content: center;
}

nav > ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  width: 1200px;
}

nav > ul > li {
  flex: 1;
  position: relative;
}
nav ul li > ul {
  position: absolute;
  left: 0px;
  top: 45px;
  list-style: none;
  background: #333;
  width: 100%;
  display: none;
}
/* nav ul li:hover > ul {
  display: block;
} */
nav ul li > ul li {
  list-style: none;
  text-align: center;
}
nav ul li a {
  color: #fff;
  text-decoration: none;
  font-size: 14px;
  font-weight: bold;
  transition: all 0.3s ease;
  display: flex;
  justify-content: center;
  padding: 12px 0;
}

nav ul li a:hover {
  text-decoration: underline;
  color: #000;
  background: #fff;
}

.container {
  display: flex;
  flex-wrap: wrap;
  padding: 40px 20px;
  max-width: 1160px;
  margin: 0 auto;
  margin-top: 20px;
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.main-content {
  flex: 2;
  padding-right: 30px;
}
.sidebar {
  flex: 1;
  min-width: 300px;
}

h2 {
  font-size: 22px;
  margin-top: 0;
}

.key-dates {
  background-color: #ffffcc;
  border: 1px solid #ffcc00;
  padding: 15px;
  margin: 15px 0;
}

.key-dates h3 {
  margin-top: 0;
  font-size: 18px;
  font-weight: bold;
  text-align: left;
}

.key-dates ul {
  list-style: none;
  padding: 0;
  font-size: 14px;
}

.key-dates ul li {
  margin: 8px 0;
}

.download-links a {
  display: block;
  color: #0066cc;
  margin: 5px 0;
  font-size: 14px;
}

.organizer-info,
.committee,
.location {
  margin: 20px 0;
  font-size: 14px;
}

.committee ul {
  list-style: disc;
  padding-left: 20px;
}

.committee ul li {
  margin: 8px 0;
}

.register-btn {
  background-color: #0066cc;
  color: #fff;
  border: none;
  padding: 12px 24px;
  font-size: 16px;
  font-weight: bold;
  border-radius: 4px;
  cursor: pointer;
  margin: 20px 0;
  width: 100%;
}

.register-btn:hover {
  background-color: #0052a3;
}

footer {
  text-align: left;
  padding: 20px;
  font-size: 14px;
}

/* Registration Form Styles */
.registration-form {
  max-width: 1160px;
  margin: 0 auto;
  padding: 20px;
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  margin-top: 20px;
}

.form-group {
  margin-bottom: 15px;
}

.form-group label {
  display: block;
  margin-bottom: 10px;
  font-weight: bold;
}

.form-group input[type="text"],
.form-group input[type="tel"],
.form-group input[type="email"] {
  width: auto;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 16px;
  display: flex;
  flex: 1;
}

.form-group select {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 16px;
}

.form-group textarea {
  width: auto;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 16px;
  resize: vertical;
  display: flex;
  flex: 1;
}

.radio-group,
.checkbox-group {
  margin-top: 5px;
}

.radio-group label,
.checkbox-group label {
  font-weight: normal;
  margin-bottom: 5px;
  display: block;
}

.captcha {
  margin-top: 5px;
}

.captcha img {
  margin-bottom: 10px;
}

.price-info {
  margin: 20px 0;
  padding: 15px;
  background-color: #e3f2fd;
  border-radius: 4px;
}

.submit-btn {
  background-color: #4caf50;
  color: #fff;
  border: none;
  padding: 12px 24px;
  font-size: 16px;
  border-radius: 4px;
  cursor: pointer;
}

.submit-btn:hover {
  background-color: #45a049;
}

/* Payment Page Styles */
.payment-page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px;
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  margin-top: 20px;
}

.payment-info {
  margin: 20px 0;
  padding: 15px;
  background-color: #e8f5e9;
  border-radius: 4px;
}

.pay-btn {
  background-color: #ff9800;
  color: #fff;
  border: none;
  padding: 12px 24px;
  font-size: 16px;
  border-radius: 4px;
  cursor: pointer;
}

.pay-btn:hover {
  background-color: #f57c00;
}

/* Hidden class for pages */
.hidden {
  display: none;
}
.conference-title {
  font-size: 16px;
}
.programs {
  line-height: 2;
}
nav .active {
  color: #000;
  background: #fff;
}
@media screen and (max-width: 768px) {
  nav > ul {
    flex-wrap: wrap;
    width: 100%;
    padding: 10px 0;
  }
  nav > ul > li {
    width: 33.3%;
    flex: auto;
  }
  nav > ul li a {
    padding: 6px 0;
  }
  nav > ul > li > ul {
    z-index: 999;
  }
  .main-content {
    min-width: 100%;
  }
  .registration-form {
    padding: 4vw;
    width: 80%;
  }
  .table-time {
    width: 100px;
  }
  table td {
    font-size: 12px;
  }
}