/* ========================================
   主样式文件 2.0 - 现代化设计
   ======================================== */

/* ========================================
   动态背景效果
   ======================================== */
body {
  position: relative;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(255, 215, 0, 0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(0, 212, 255, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(168, 85, 247, 0.05) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
  animation: bgPulse 10s ease-in-out infinite;
}

@keyframes bgPulse {
  0%, 100% {
    opacity: 0.5;
  }
  50% {
    opacity: 1;
  }
}

/* ========================================
   容器布局
   ======================================== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  position: relative;
  z-index: 1;
}

/* ========================================
   Header 组件 - 现代化设计
   ======================================== */
.page-header {
  text-align: center;
  padding: 80px 20px 60px;
  animation: fadeInDown 1s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

/* Logo和标题容器 */
.header-title-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 30px;
  margin-bottom: 30px;
  animation: fadeInDown 1s ease-out;
}

/* Logo样式 */
.header-logo {
  flex-shrink: 0;
}

.header-logo img {
  max-width: 120px;
  height: auto;
  display: block;
}

/* 英文标题组 */
.title-group-en {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* Header Banner样式 */
.header-banner {
  width: 100%;
  max-width: 800px;
  margin: 0 auto 30px;
  animation: fadeInDown 1.2s ease-out;
}

.header-banner a {
  display: block;
  width: 100%;
}

.header-banner img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
  border-radius: var(--radius-card);
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.4);
  /* 优化大图片在所有设备上的显示 */
  object-fit: cover;
}

@keyframes logoFloat {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* 英文主标题 */
.page-header .title-en {
  font-family: var(--font-family-en);
  font-size: var(--font-size-h1-en);
  font-weight: var(--font-weight-bold);
  color: var(--gold-main);
  margin-bottom: 8px;
  letter-spacing: 4px;
  text-transform: uppercase;
  text-shadow: 0 0 30px rgba(255, 215, 0, 0.5);
  background: linear-gradient(135deg, var(--gold-main) 0%, var(--gold-hover) 50%, var(--gold-main) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 英文副标题 */
.page-header .subtitle-en {
  font-family: var(--font-family-en);
  font-size: var(--font-size-h2-en);
  font-weight: var(--font-weight-bold);
  color: var(--gold-hover);
  margin-bottom: 20px;
  letter-spacing: 2px;
  text-transform: uppercase;
  opacity: 0.9;
}

/* 年份标签 */
.page-header .year-badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--gold-light) 0%, var(--gold-main) 100%);
  color: var(--text-dark);
  font-family: var(--font-family-en);
  font-size: var(--font-size-year);
  font-weight: var(--font-weight-bold);
  padding: 8px 28px;
  border-radius: 50px;
  margin-bottom: 30px;
  letter-spacing: 3px;
  box-shadow: 0 8px 24px rgba(255, 215, 0, 0.4);
  position: relative;
  overflow: hidden;
}

.page-header .year-badge::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transform: rotate(45deg);
  animation: shimmer 3s infinite;
}

@keyframes shimmer {
  0% {
    left: -50%;
  }
  100% {
    left: 150%;
  }
}

/* 中文主标题 */
.page-header .title-cn {
  font-family: var(--font-family-cn);
  font-size: var(--font-size-h1-cn);
  font-weight: var(--font-weight-bold);
  color: var(--text-white);
  margin-bottom: 20px;
  letter-spacing: 8px;
  text-shadow: 0 0 40px rgba(255, 255, 255, 0.3);
  text-align: center;
}

/* 城市标签组 */
.page-header .city-tags {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--spacing-city);
  margin-top: 20px;
  width: 100%;
  max-width: 100%;
}

/* 城市标签 */
.page-header .city-tag {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  color: var(--gold-main);
  font-size: var(--font-size-city);
  font-weight: var(--font-weight-bold);
  padding: 10px 24px;
  border-radius: 50px;
  transition: var(--transition-base);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.page-header .city-tag::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--gold-main), var(--gold-hover));
  opacity: 0;
  transition: var(--transition-base);
  z-index: -1;
}

.page-header .city-tag:hover {
  color: var(--text-dark);
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 8px 20px rgba(255, 215, 0, 0.3);
  border-color: var(--gold-main);
}

.page-header .city-tag:hover::before {
  opacity: 1;
}

.page-header .city-tag.active {
  color: var(--text-dark);
  background: linear-gradient(135deg, var(--gold-main), var(--gold-hover));
  border-color: var(--gold-main);
  box-shadow: 0 8px 20px rgba(255, 215, 0, 0.4);
  transform: translateY(-2px);
}

/* ========================================
   Section 组件 - 现代化玻璃态设计
   ======================================== */
.content-section {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-card);
  padding: 36px;
  margin-bottom: var(--spacing-section);
  opacity: 0;
  animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  box-shadow: var(--shadow-lg);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.content-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gold-main), var(--accent-cyan), var(--accent-purple));
  opacity: 0;
  transition: var(--transition-base);
}

.content-section:hover::before {
  opacity: 1;
}

.content-section:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
  border-color: rgba(255, 215, 0, 0.3);
}

/* 为每个section添加延迟动画 */
.content-section:nth-child(1) {
  animation-delay: 0.1s;
}

.content-section:nth-child(2) {
  animation-delay: 0.2s;
}

.content-section:nth-child(3) {
  animation-delay: 0.3s;
}

.content-section:nth-child(4) {
  animation-delay: 0.4s;
}

.content-section:nth-child(5) {
  animation-delay: 0.5s;
}

/* Section 头部 */
.content-section .section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-section-title);
  cursor: pointer;
  user-select: none;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

/* Section 标题 */
.content-section > .section-title {
  font-size: var(--font-size-section-title);
  font-weight: var(--font-weight-bold);
  color: var(--text-white);
  letter-spacing: 2px;
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: var(--spacing-section-title);
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.content-section > .section-title::before {
  content: '';
  width: 4px;
  height: 24px;
  background: linear-gradient(180deg, var(--gold-main), var(--accent-cyan));
  border-radius: 2px;
}

/* 箭头图标 */
.content-section .arrow-icon {
  font-family: var(--font-family-en);
  font-size: 28px;
  color: var(--gold-main);
  transition: var(--transition-base);
  font-weight: var(--font-weight-bold);
  text-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
}

.content-section .section-header:hover .arrow-icon {
  color: var(--gold-hover);
  transform: translateX(8px) scale(1.1);
  text-shadow: 0 0 20px rgba(255, 215, 0, 0.8);
}

/* Section 内容 */
.content-section .section-content {
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  transition: var(--transition-smooth);
}

.content-section .section-content h4 {
  color: var(--gold-main);
  font-size: clamp(16px, 2.5vw, 20px);
  font-weight: var(--font-weight-bold);
  margin: 24px 0 16px;
  letter-spacing: 1px;
}

.content-section .section-content h4:first-child {
  margin-top: 0;
}

.content-section .section-content p {
  margin-bottom: 16px;
  color: rgba(255, 255, 255, 0.85);
}

.content-section .section-content strong {
  color: var(--gold-hover);
  font-weight: var(--font-weight-bold);
}

/* ========================================
   动画定义 - 增强版
   ======================================== */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========================================
   主内容区域
   ======================================== */
.main-content {
  padding: 20px 0 60px;
}

/* ========================================
   响应式设计 - 增强版
   ======================================== */
@media (max-width: 768px) {
  /* 容器 */
  .container {
    padding: 0 16px;
  }

  /* Header */
  .page-header {
    padding: 40px 16px 40px;
  }

  .header-title-row {
    gap: 15px;
    margin-bottom: 20px;
  }

  .header-logo img {
    max-width: 80px;
  }

  .page-header .title-cn {
    margin-bottom: 20px;
  }

  .header-banner {
    max-width: 100%;
    margin: 0 auto 20px;
  }

  .header-banner img {
    border-radius: 12px;
    /* 手机端保持图片比例，确保文字清晰可读 */
    width: 100%;
    height: auto;
    min-height: 120px;
  }

  .page-header .title-en {
    letter-spacing: 2px;
  }

  .page-header .subtitle-en {
    letter-spacing: 1px;
  }

  .page-header .year-badge {
    padding: 6px 20px;
    letter-spacing: 2px;
  }

  .page-header .title-cn {
    letter-spacing: 4px;
  }

  .page-header .city-tags {
    gap: 10px;
    flex-wrap: wrap;
  }

  .page-header .city-tag {
    padding: 8px 18px;
    white-space: nowrap;
  }

  /* Section */
  .content-section {
    padding: 24px 20px;
    margin-bottom: 24px;
    border-radius: 12px;
  }

  .content-section > .section-title {
    margin-bottom: 16px;
    padding-bottom: 12px;
  }

  .content-section > .section-title::before {
    height: 20px;
  }

  .content-section .arrow-icon {
    font-size: 24px;
  }

  .content-section .section-content h4 {
    margin: 20px 0 12px;
  }

  /* 表单响应式 */
  .registration-form {
    max-width: 100%;
  }

  .form-group {
    margin-bottom: 20px;
  }

  .form-input {
    padding: 12px 16px;
    font-size: 15px;
  }

  .submit-btn {
    padding: 14px 24px;
    font-size: 18px;
  }

  .btn-icon {
    font-size: 20px;
  }
}

@media (max-width: 480px) {
  .page-header {
    padding: 30px 12px 30px;
  }

  .header-title-row {
    gap: 12px;
    margin-bottom: 15px;
  }

  .header-logo img {
    max-width: 70px;
  }

  .page-header .title-cn {
    margin-bottom: 15px;
  }

  .header-banner {
    max-width: 100%;
    margin: 0 auto 15px;
  }

  .header-banner img {
    border-radius: 8px;
    /* 小屏幕也保持清晰显示 */
    width: 100%;
    height: auto;
  }

  .page-header .title-cn {
    letter-spacing: 2px;
  }

  .page-header .city-tags {
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
  }

  .page-header .city-tag {
    padding: 6px 14px;
    font-size: 13px;
  }

  .content-section {
    padding: 20px 16px;
  }
}

/* ========================================
   工具类
   ======================================== */
.text-center {
  text-align: center;
}

.mt-20 {
  margin-top: 20px;
}

.mb-20 {
  margin-bottom: 20px;
}

/* ========================================
   表单样式 - 现代化设计
   ======================================== */
.form-section {
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.05) 0%, rgba(0, 212, 255, 0.05) 100%);
}

.form-section > .section-title {
  background: linear-gradient(135deg, var(--gold-main), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 表单容器 */
.registration-form {
  max-width: 600px;
  margin: 0 auto;
}

/* 表单组 */
.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 8px;
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-medium);
  color: var(--text-white);
}

.label-text {
  letter-spacing: 1px;
}

.required {
  color: var(--accent-pink);
  font-size: 18px;
  font-weight: var(--font-weight-bold);
}

/* 输入框样式 */
.form-input {
  width: 100%;
  padding: 14px 20px;
  font-size: var(--font-size-body);
  color: var(--text-white);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  transition: var(--transition-base);
  outline: none;
  font-family: var(--font-family-cn);
}

.form-input::placeholder {
  color: rgba(255, 255, 255, 0.4);
}

.form-input:focus {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--gold-main);
  box-shadow: 0 0 20px rgba(255, 215, 0, 0.2);
  transform: translateY(-2px);
}

.form-input:hover:not(:focus) {
  border-color: rgba(255, 215, 0, 0.3);
  background: rgba(255, 255, 255, 0.06);
}

/* 提交按钮 */
.submit-btn {
  width: 100%;
  padding: 16px 32px;
  margin-top: 32px;
  font-size: var(--font-size-section-title);
  font-weight: var(--font-weight-bold);
  color: var(--text-dark);
  background: linear-gradient(135deg, var(--gold-main) 0%, var(--gold-hover) 100%);
  border: none;
  border-radius: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  transition: var(--transition-base);
  box-shadow: 0 4px 16px rgba(255, 215, 0, 0.3);
  position: relative;
  overflow: hidden;
}

.submit-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  transition: var(--transition-base);
}

.submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 215, 0, 0.5);
}

.submit-btn:hover::before {
  left: 100%;
}

.submit-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(255, 215, 0, 0.3);
}

.submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-text {
  letter-spacing: 2px;
}

.btn-icon {
  font-size: 24px;
  transition: var(--transition-base);
}

.submit-btn:hover .btn-icon {
  transform: translateX(4px);
}

/* 表单消息 */
.form-message {
  margin-top: 20px;
  padding: 16px 20px;
  border-radius: 12px;
  font-size: var(--font-size-body);
  text-align: center;
  opacity: 0;
  transform: translateY(-10px);
  transition: var(--transition-base);
}

.form-message.show {
  opacity: 1;
  transform: translateY(0);
}

.form-message.success {
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.3);
  color: var(--accent-cyan);
}

.form-message.error {
  background: rgba(236, 72, 153, 0.1);
  border: 1px solid rgba(236, 72, 153, 0.3);
  color: var(--accent-pink);
}

/* 加载动画 */
.submit-btn.loading .btn-text {
  opacity: 0.8;
}

.submit-btn.loading .btn-icon {
  animation: rotate 1s linear infinite;
}

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* 表单验证样式 */
.form-input:invalid:not(:placeholder-shown) {
  border-color: rgba(236, 72, 153, 0.5);
}

.form-input:valid:not(:placeholder-shown) {
  border-color: rgba(0, 212, 255, 0.3);
}

.form-input.error {
  border-color: var(--accent-pink) !important;
  box-shadow: 0 0 10px rgba(236, 72, 153, 0.3);
  animation: shake 0.5s ease-in-out;
}

@keyframes shake {
  0%, 100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-10px);
  }
  75% {
    transform: translateX(10px);
  }
}

/* ========================================
   打印样式
   ======================================== */
@media print {
  body::before {
    display: none;
  }

  .content-section {
    break-inside: avoid;
  }
}

/* ========================================
   城市信息展示区域样式
   ======================================== */
.city-info-display {
  display: none;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-card);
  padding: 24px 28px;
  margin-top: 20px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  animation: fadeInUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-lg);
}

.city-info-display.show {
  display: block;
}

.city-info-display .city-info-title {
  font-size: 20px;
  font-weight: var(--font-weight-bold);
  color: var(--gold-main);
  margin-bottom: 20px;
  letter-spacing: 2px;
  text-align: center;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 215, 0, 0.2);
}

.city-info-display .city-info-content {
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--font-size-body);
  line-height: 1.8;
  text-align: left;
}

.city-info-display .city-info-content p {
  margin-bottom: 12px;
}

.city-info-display .city-info-content strong {
  color: var(--gold-main);
  font-weight: var(--font-weight-bold);
}

.city-info-display .organizer-section {
  display: flex;
  margin-bottom: 16px;
  align-items: flex-start;
}

.city-info-display .organizer-section:last-child {
  margin-bottom: 0;
}

.city-info-display .organizer-label {
  color: var(--gold-main);
  font-weight: var(--font-weight-bold);
  flex-shrink: 0;
  margin-right: 8px;
}

.city-info-display .organizer-content {
  color: rgba(255, 255, 255, 0.9);
  flex: 1;
  word-break: break-all;
}

/* 响应式 - 城市信息展示 */
@media (max-width: 768px) {
  .city-info-display {
    padding: 20px;
    margin-left: 0;
    margin-right: 0;
    max-width: 100%;
  }

  .city-info-display .city-info-title {
    font-size: 18px;
  }

  .city-info-display .city-info-content {
    font-size: 15px;
  }
}

@media (max-width: 480px) {
  .city-info-display {
    padding: 16px;
  }

  .city-info-display .city-info-title {
    font-size: 16px;
  }

  .city-info-display .city-info-content {
    font-size: 14px;
  }
}

/* ========================================
   线下报名区域样式
   ======================================== */
.offline-registration {
  padding: 20px;
  background: rgba(255, 215, 0, 0.05);
  border-radius: 12px;
  border: 1px solid rgba(255, 215, 0, 0.1);
}

.offline-registration .select-hint {
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 16px;
  margin: 0;
  padding: 20px 0;
}

.offline-registration .location-info {
  animation: fadeInUp 0.4s ease;
}

.offline-registration .location-item {
  margin-bottom: 20px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 8px;
  border-left: 3px solid var(--gold-main);
}

.offline-registration .location-item:last-child {
  margin-bottom: 0;
}

.offline-registration .location-content {
  flex: 1;
}

.offline-registration .location-label {
  color: var(--gold-main);
  font-weight: var(--font-weight-bold);
  font-size: 16px;
  margin-bottom: 8px;
  display: block;
}

.offline-registration .location-text {
  color: rgba(255, 255, 255, 0.9);
  font-size: 15px;
  line-height: 1.8;
  margin: 0;
  word-break: break-all;
}

.offline-registration .phone-text {
  color: var(--accent-cyan);
  font-weight: var(--font-weight-medium);
}

/* 响应式 - 线下报名 */
@media (max-width: 768px) {
  .offline-registration {
    padding: 16px;
  }

  .offline-registration .location-item {
    padding: 12px;
    margin-bottom: 16px;
  }

  .offline-registration .location-label {
    font-size: 15px;
  }

  .offline-registration .location-text {
    font-size: 14px;
  }

  .offline-registration .select-hint {
    font-size: 14px;
  }
}

@media (max-width: 480px) {
  .offline-registration {
    padding: 12px;
  }

  .offline-registration .location-item {
    padding: 10px;
  }
}