/* SCCL 2025 - 学术会议风格婚礼网站样式 */

:root {
  /* 主题色彩 */
  --coral-red: #FF7F7F;
  --ivory-white: #FFFFF0;
  --champagne-gold: #F7E7CE;
  --dark-coral: #E66B6B;
  --light-coral: #FFB3B3;
  --text-dark: #2C3E50;
  --text-light: #7F8C8D;
  --shadow: rgba(0, 0, 0, 0.1);
  --border-light: rgba(255, 127, 127, 0.2);
  
  /* 字体 - 等线风格字体系列 */
  --font-primary: 
    "Inter", 
    "Noto Sans SC",
    "Dengxian", "等线",
    "PingFang SC", "苹方-简",
    "Microsoft YaHei UI", "Microsoft YaHei", "微软雅黑",
    "Segoe UI",
    -apple-system, BlinkMacSystemFont,
    "Helvetica Neue", Helvetica, Arial,
    sans-serif;
  
  --font-secondary: 
    "Inter", 
    "Noto Sans SC",
    "Dengxian", "等线",
    "PingFang SC", "苹方-简", 
    "Microsoft YaHei UI", "Microsoft YaHei", "微软雅黑",
    "Segoe UI",
    -apple-system, BlinkMacSystemFont,
    "Helvetica Neue", Helvetica, Arial,
    sans-serif;
  
  /* 间距 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  
  /* 边框圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

/* 基础重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-secondary);
  line-height: 1.6;
  color: var(--text-dark);
  background: linear-gradient(135deg, var(--ivory-white) 0%, var(--champagne-gold) 100%);
  min-height: 100vh;
}

/* 排版 */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-primary);
  margin-bottom: var(--spacing-sm);
  line-height: 1.3;
}

h1 {
  font-size: 2.5rem;
  color: var(--coral-red);
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: 2rem;
  color: var(--dark-coral);
  border-bottom: 2px solid var(--coral-red);
  padding-bottom: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: 1.5rem;
  color: var(--coral-red);
  margin-bottom: var(--spacing-sm);
}

p {
  margin-bottom: var(--spacing-sm);
  text-align: justify;
}

a {
  color: var(--coral-red);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--dark-coral);
  text-decoration: underline;
}

/* 布局容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xl) 0;
  margin-bottom: var(--spacing-lg);
}

.card {
  background: rgba(255, 255, 240, 0.95);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: 0 8px 32px rgba(255, 127, 127, 0.15);
  margin-bottom: var(--spacing-lg);
  backdrop-filter: blur(15px);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(45deg, var(--coral-red), var(--champagne-gold), var(--coral-red));
  border-radius: var(--radius-lg);
  z-index: -1;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 16px 48px rgba(255, 127, 127, 0.25);
}

.card:hover::before {
  opacity: 0.8;
}

/* 导航栏 */
.navbar {
  background: rgba(255, 255, 240, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 2px solid var(--coral-red);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px var(--shadow);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.nav-logo-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  transition: opacity 0.3s ease;
}

.nav-logo-link:hover {
  opacity: 0.8;
}

.nav-logo img {
  height: 40px;
  width: auto;
}

.nav-logo .logo-text {
  font-family: var(--font-primary);
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--coral-red);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.nav-item a {
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all 0.3s ease;
}

.nav-item a:hover,
.nav-item a.active {
  background: var(--coral-red);
  color: white;
  text-decoration: none;
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--coral-red);
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: var(--radius-sm);
  transition: background-color 0.3s ease;
}

.nav-toggle:hover {
  background: rgba(255, 127, 127, 0.1);
}

/* 语言切换 */
.lang-switch {
  display: flex;
  gap: var(--spacing-xs);
}

.lang-btn {
  background: none;
  border: 1px solid var(--coral-red);
  color: var(--coral-red);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 0.9rem;
}

.lang-btn:hover,
.lang-btn.active {
  background: var(--coral-red);
  color: white;
}

/* 主要内容区域 */
.main-content {
  margin-top: 80px;
  min-height: calc(100vh - 80px);
}

/* 英雄区域 */
.hero {
  text-align: center;
  padding: var(--spacing-xl) 0;
  background: 
    linear-gradient(135deg, rgba(255, 127, 127, 0.1) 0%, rgba(247, 231, 206, 0.8) 50%, rgba(255, 255, 240, 0.9) 100%),
    radial-gradient(circle at 30% 80%, rgba(255, 179, 179, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(247, 231, 206, 0.4) 0%, transparent 50%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: 
    radial-gradient(circle, rgba(255, 127, 127, 0.1) 1px, transparent 1px);
  background-size: 50px 50px;
  animation: float 20s ease-in-out infinite;
  opacity: 0.3;
}

@keyframes float {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(180deg); }
}

.hero-logo {
  width: 150px;
  height: auto;
  margin-bottom: var(--spacing-md);
  filter: drop-shadow(0 8px 16px rgba(255, 127, 127, 0.3));
  animation: logoGlow 3s ease-in-out infinite alternate;
  position: relative;
  z-index: 2;
}

@keyframes logoGlow {
  0% { filter: drop-shadow(0 8px 16px rgba(255, 127, 127, 0.3)) brightness(1); }
  100% { filter: drop-shadow(0 12px 24px rgba(255, 127, 127, 0.5)) brightness(1.1); }
}

.hero-title {
  font-family: var(--font-script);
  font-size: 4rem;
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(45deg, var(--coral-red), var(--dark-coral), #FF6B6B);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 4px 8px rgba(255, 127, 127, 0.3);
  position: relative;
  z-index: 2;
  font-weight: 600;
  letter-spacing: 3px;
  line-height: 1.2;
  text-transform: none;
}

.hero-subtitle {
  font-size: 1.4rem;
  color: var(--text-dark);
  margin-bottom: var(--spacing-lg);
  font-style: italic;
  position: relative;
  z-index: 2;
  opacity: 0.9;
}

.hero-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.info-item {
  background: rgba(255, 255, 255, 0.95);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 2px solid var(--coral-red);
  box-shadow: 0 8px 32px rgba(255, 127, 127, 0.2);
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.info-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 127, 127, 0.1), transparent);
  transition: left 0.8s ease;
}

.info-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 48px rgba(255, 127, 127, 0.3);
  border-color: var(--dark-coral);
}

.info-item:hover::before {
  left: 100%;
}

.info-item h3 {
  color: var(--coral-red);
  margin-bottom: var(--spacing-sm);
  font-size: 1.3rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.info-item h3::before {
  content: '✨';
  font-size: 1.2rem;
}

/* 按钮样式 */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--coral-red);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
}

.btn:hover {
  background: var(--dark-coral);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px var(--shadow);
  text-decoration: none;
  color: white;
}

.btn-secondary {
  background: transparent;
  color: var(--coral-red);
  border: 2px solid var(--coral-red);
}

.btn-secondary:hover {
  background: var(--coral-red);
  color: white;
}

.btn-large {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1.1rem;
}

/* 表单样式 */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
  color: var(--text-dark);
}

.form-control {
  width: 100%;
  padding: var(--spacing-sm);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-md);
  font-size: 1rem;
  transition: border-color 0.3s ease;
  background: rgba(255, 255, 255, 0.9);
}

.form-control:focus {
  outline: none;
  border-color: var(--coral-red);
  box-shadow: 0 0 0 3px rgba(255, 127, 127, 0.1);
}

.form-control.error {
  border-color: #e74c3c;
}

.error-message {
  color: #e74c3c;
  font-size: 0.9rem;
  margin-top: var(--spacing-xs);
}

.success-message {
  color: #27ae60;
  font-size: 0.9rem;
  margin-top: var(--spacing-xs);
}

/* 图片画廊 */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.gallery-item {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(255, 127, 127, 0.2);
  transition: all 0.4s ease;
  position: relative;
  background: white;
}

.gallery-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, transparent 30%, rgba(255, 127, 127, 0.1) 50%, transparent 70%);
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 2;
}

.gallery-item:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: 0 20px 40px rgba(255, 127, 127, 0.3);
}

.gallery-item:hover::before {
  opacity: 1;
}

.gallery-item img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  transition: all 0.4s ease;
  filter: brightness(0.9);
}

.gallery-item:hover img {
  transform: scale(1.1);
  filter: brightness(1.1) saturate(1.2);
}

/* 画廊标题美化 */
.gallery-title {
  text-align: center;
  font-size: 2.5rem;
  color: var(--coral-red);
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.gallery-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--coral-red), transparent);
}

/* 页脚 */
.footer {
  background: var(--coral-red);
  color: white;
  text-align: center;
  padding: var(--spacing-lg) 0;
  margin-top: var(--spacing-xl);
}

.footer p {
  margin-bottom: var(--spacing-xs);
}

.footer a {
  color: var(--champagne-gold);
}

.footer a:hover {
  color: white;
}

/* 加载动画 */
.loading {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-xl);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-light);
  border-top: 4px solid var(--coral-red);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* 心跳动画 */
@keyframes heartbeat {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

/* 邀请页面特效 */
.invite-choice-accept {
  border-color: var(--coral-red) !important;
  background: rgba(255, 127, 127, 0.1) !important;
  transform: scale(1.05);
}

.invite-choice-decline {
  border-color: var(--text-light) !important;
  background: rgba(127, 140, 141, 0.1) !important;
}

/* 欢迎页面响应式 */
@media (max-width: 768px) {
  .hero-title {
    font-size: 3rem !important;
    letter-spacing: 2px !important;
  }
  
  .hero-subtitle {
    font-size: 1.2rem !important;
  }
  
  .welcome-grid {
    grid-template-columns: 1fr !important;
  }
  
  .welcome-image {
    order: -1;
    margin-bottom: 2rem;
  }
}

/* 模态框 */
.modal {
  display: none;
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
}

.modal-content {
  background: var(--ivory-white);
  margin: 5% auto;
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 600px;
  position: relative;
  animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
  from { opacity: 0; transform: translateY(-50px); }
  to { opacity: 1; transform: translateY(0); }
}

.modal-close {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-md);
  font-size: 2rem;
  font-weight: bold;
  color: var(--text-light);
  cursor: pointer;
  background: none;
  border: none;
}

.modal-close:hover {
  color: var(--coral-red);
}

/* 隐藏类 */
.hidden {
  display: none !important;
}

/* 手机端导航提示 */
.mobile-nav-tip {
  position: fixed;
  top: 80px;
  left: 0;
  right: 0;
  z-index: 1500;
  padding: 0 var(--spacing-sm);
}

.nav-tip-content {
  background: linear-gradient(135deg, var(--coral-red), var(--dark-coral));
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  box-shadow: 0 4px 20px rgba(255, 127, 127, 0.4);
  animation: tipSlideIn 0.5s ease;
}

@keyframes tipSlideIn {
  from { 
    opacity: 0; 
    transform: translateY(-20px); 
  }
  to { 
    opacity: 1; 
    transform: translateY(0); 
  }
}

.tip-icon {
  font-size: 1.2rem;
  animation: tipPulse 2s infinite;
}

@keyframes tipPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.tip-text {
  flex: 1;
  font-size: 0.9rem;
  font-weight: 500;
}

.tip-close {
  background: none;
  border: none;
  color: white;
  font-size: 1.1rem;
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 50%;
  transition: background-color 0.3s ease;
}

.tip-close:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* 响应式设计 */
@media (max-width: 768px) {
  html {
    font-size: 14px;
  }
  
  .nav-container {
    padding: var(--spacing-sm);
  }
  
  .nav-controls {
    gap: var(--spacing-xs);
  }
  
  .lang-switch {
    gap: 4px;
  }
  
  .lang-btn {
    padding: 4px 8px;
    font-size: 0.8rem;
    min-width: 28px;
    text-align: center;
  }
  
  .nav-menu {
    position: fixed;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(255, 255, 240, 0.98);
    flex-direction: column;
    padding: var(--spacing-lg);
    border-top: 2px solid var(--coral-red);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-toggle {
    display: block;
    min-width: 40px;
    min-height: 40px;
  }
  
  .hero-title {
    font-size: 2.8rem;
    letter-spacing: 2px;
  }
  
  .hero-info {
    grid-template-columns: 1fr;
  }
  
  .gallery {
    grid-template-columns: 1fr;
  }
  
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .card {
    padding: var(--spacing-md);
  }
  
  .modal-content {
    width: 95%;
    margin: 10% auto;
    padding: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2.3rem;
    letter-spacing: 1px;
  }
  
  .nav-container {
    padding: 8px 12px;
  }
  
  .nav-logo .logo-text {
    font-size: 1.1rem;
  }
  
  .nav-logo img {
    height: 28px;
  }
  
  .nav-controls {
    gap: 6px;
  }
  
  .lang-btn {
    padding: 3px 6px;
    font-size: 0.75rem;
    min-width: 24px;
  }
  
  .nav-toggle {
    min-width: 36px;
    min-height: 36px;
    font-size: 1.3rem;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
}