/* ==========================================================================
   styles.css - 费城老炮男声合唱团官方网站主样式表 (Main Stylesheet)
   设计风格：现代尊贵、暗色调、金/香槟色点缀、精美微交互与极致响应式
   ========================================================================== */

/* 引入 Google 字体 */
@import url('https://fonts.googleapis.com/css2?family=Cinzel:wght@500;700;900&family=Outfit:wght@300;400;600;700&display=swap');

/* ==========================================================================
   1. 变量与设计系统 (Design System & CSS Variables)
   ========================================================================== */
:root {
  /* 配色方案 (Color System) */
  --bg-primary: hsl(230, 35%, 7%);       /* 极暗蓝黑色，高雅沉稳 */
  --bg-secondary: hsl(230, 30%, 11%);    /* 稍浅的暗色卡片背景 */
  --bg-tertiary: hsl(230, 25%, 16%);     /* 悬浮/输入框背景 */
  
  --accent-gold: hsl(45, 75%, 55%);      /* 经典香槟金，音乐殿堂质感 */
  --accent-gold-hover: hsl(45, 90%, 65%);/* 高亮金 */
  --accent-gold-rgba: rgba(212, 175, 55, 0.15); /* 金色阴影/透明贴膜 */
  
  --text-main: hsl(210, 20%, 96%);       /* 主文本（白灰色） */
  --text-muted: hsl(210, 12%, 68%);      /* 辅助文本（静谧灰） */
  --text-dark: hsl(230, 35%, 7%);        /* 深色反色文本 */
  
  --border-color: rgba(255, 255, 255, 0.08); /* 柔和白边框 */
  --border-gold: rgba(212, 175, 55, 0.3);   /* 柔和金边框 */
  
  /* 阴影与虚化 (Shadow & Blur) */
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.6);
  --glass-bg: rgba(11, 13, 23, 0.75);
  --glass-blur: blur(16px);
  
  /* 字体系统 (Typography) */
  --font-display: 'Cinzel', 'Playfair Display', Georgia, serif; /* 用于标题，厚重艺术感 */
  --font-body: 'Outfit', 'Inter', -apple-system, sans-serif;    /* 用于正文，高可读性 */
  
  /* 布局过渡 (Transitions) */
  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.2s ease;
}

/* ==========================================================================
   2. 基础重置 (Base & Reset)
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-body);
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body.no-scroll {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-fast);
}

button, input, textarea {
  font-family: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-padding {
  padding: 6rem 0;
}

/* 隐藏实用类 */
.hidden {
  display: none !important;
}

/* 按钮样式 (Buttons) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 2rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 50px;
  cursor: pointer;
  transition: var(--transition-smooth);
  letter-spacing: 1px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-gold), hsl(45, 60%, 45%));
  color: var(--text-dark);
  box-shadow: 0 4px 15px rgba(212, 175, 55, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--accent-gold-hover), var(--accent-gold));
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(212, 175, 55, 0.45);
}

.btn-lang {
  border: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.04);
  padding: 0.4rem 1rem;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: 600;
}

.btn-lang:hover {
  border-color: var(--accent-gold);
  color: var(--accent-gold);
  background: var(--accent-gold-rgba);
}

.w-full {
  width: 100%;
}

/* 辅助边距类 */
.text-center { text-align: center; }
.py-5 { padding-top: 3rem; padding-bottom: 3rem; }

/* 标题样式 (Section Titles) */
.section-title {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--text-main);
  text-shadow: 0 2px 10px rgba(0,0,0,0.5);
  margin-bottom: 0.75rem;
}

.section-title-line {
  width: 60px;
  height: 3px;
  background-color: var(--accent-gold);
  margin: 0 auto 3rem auto;
  border-radius: 2px;
  box-shadow: 0 0 10px var(--accent-gold);
}

/* ==========================================================================
   3. 动画库 (Animation System)
   ========================================================================== */
.animate-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.animate-scroll {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 1s cubic-bezier(0.16, 1, 0.3, 1), transform 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.visible {
  opacity: 1;
  transform: translateY(0);
}

.delay-1 { transition-delay: 0.2s; }
.delay-2 { transition-delay: 0.4s; }

/* ==========================================================================
   4. 顶部导航 (Sticky Header)
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: transparent;
  border-bottom: 1px solid transparent;
  transition: var(--transition-smooth);
}

/* 滚动后高亮玻璃拟态 (Scrolled Header) */
.site-header.scrolled {
  background-color: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border-color);
  padding: 0.25rem 0;
  box-shadow: var(--shadow-sm);
}

.header-container {
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition-smooth);
}

.site-header.scrolled .header-container {
  height: 70px;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-wrapper {
  width: 44px;
  height: 44px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.site-title-text {
  font-family: var(--font-display);
  font-size: 1.10rem;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--text-main);
  background: linear-gradient(to right, var(--text-main), #fff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 0.5rem 0;
  letter-spacing: 0.5px;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent-gold);
  transition: var(--transition-fast);
  box-shadow: 0 0 8px var(--accent-gold);
}

.nav-link:hover, .nav-link.active {
  color: var(--accent-gold);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* 移动端菜单按钮 (Mobile Menu Hamburger) */
.menu-mobile-btn {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  cursor: pointer;
}

.menu-mobile-btn .bar {
  width: 100%;
  height: 2px;
  background-color: var(--text-main);
  border-radius: 2px;
  transition: var(--transition-fast);
}

/* ==========================================================================
   5. 首页大图 (Hero Section)
   ========================================================================== */
.hero-section {
  position: relative;
  height: 95vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg-wrapper {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -2;
}

.hero-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.35) contrast(1.05);
  transform: scale(1.02);
}

/* 浮罩网格点渐变，增添电影感 */
.hero-section::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, transparent 20%, var(--bg-primary) 90%),
              linear-gradient(to bottom, rgba(11,13,23,0.3), var(--bg-primary));
  z-index: -1;
}

.hero-content {
  text-align: center;
  max-width: 800px;
  z-index: 10;
}

.hero-title {
  font-family: var(--font-display);
  font-size: 4.8rem;
  font-weight: 900;
  color: #fff;
  letter-spacing: 4px;
  margin-bottom: 1.5rem;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.8), 0 0 40px rgba(212, 175, 55, 0.15);
}

.hero-slogan {
  font-size: 1.35rem;
  font-weight: 300;
  color: var(--text-muted);
  letter-spacing: 6px;
  margin-bottom: 3rem;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.8);
}

/* ==========================================================================
   6. 简介板块 (About Section)
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 4rem;
  align-items: start;
}

.about-content {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.about-text-p {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.8;
}

/* 数据看板 Banner */
.about-stats-banner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.stat-num {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent-gold);
  text-shadow: 0 0 10px rgba(212, 175, 55, 0.2);
}

.stat-lbl {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-top: 0.25rem;
  letter-spacing: 1px;
}

/* 核心管理层 */
.about-leaders {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
}

.about-sub-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin-bottom: 2rem;
  border-left: 3px solid var(--accent-gold);
  padding-left: 0.75rem;
  line-height: 1;
}

.leaders-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.leader-card {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1rem;
  border-radius: 8px;
  background-color: var(--bg-primary);
  border: 1px solid transparent;
  transition: var(--transition-smooth);
}

.leader-card:hover {
  border-color: var(--border-gold);
  transform: translateX(5px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.leader-avatar-placeholder {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-gold);
  display: flex;
  align-items: center;
  justify-content: center;
}

.leader-avatar-icon {
  font-size: 1.5rem;
}

.leader-info {
  display: flex;
  flex-direction: column;
}

.leader-role {
  font-size: 0.8rem;
  color: var(--accent-gold);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.leader-name {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 0.15rem;
}

/* ==========================================================================
   7. 活动预报 (Upcoming Events Section)
   ========================================================================== */
.events-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem;
}

.event-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: var(--transition-smooth);
}

.event-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-gold);
  box-shadow: var(--shadow-lg);
}

.event-poster-wrapper {
  position: relative;
  height: 240px;
  width: 100%;
  overflow: hidden;
  background-color: var(--bg-tertiary);
}

.event-poster {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-smooth);
}

.event-card:hover .event-poster {
  transform: scale(1.05);
}

/* 日期气泡挂件 */
.event-date-badge {
  position: absolute;
  top: 1rem;
  left: 1rem;
  background: linear-gradient(135deg, var(--accent-gold), hsl(45, 60%, 45%));
  color: var(--text-dark);
  padding: 0.6rem 0.8rem;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
  font-weight: 700;
  line-height: 1.1;
  min-width: 55px;
}

.date-day {
  font-size: 1.4rem;
}

.date-month {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 0.1rem;
}

.event-details {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.event-title {
  font-family: var(--font-body);
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: #fff;
  transition: var(--transition-fast);
}

.event-card:hover .event-title {
  color: var(--accent-gold);
}

.event-meta {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.25rem;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.meta-icon {
  font-size: 1rem;
}

.event-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 空状态 (Empty States) */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-secondary);
  border: 1px dashed var(--border-color);
  border-radius: 16px;
  padding: 4rem 2rem;
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  animation: pulse 2s infinite ease-in-out;
}

.empty-text {
  font-size: 1.15rem;
  color: var(--text-muted);
  letter-spacing: 1px;
}

/* ==========================================================================
   8. 作品展示 (Works Grid)
   ========================================================================== */
.works-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 2rem;
}

.work-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  transition: var(--transition-smooth);
}

.work-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-gold);
  box-shadow: var(--shadow-lg);
}

.work-thumb-wrapper {
  position: relative;
  aspect-ratio: 16 / 9;
  background-color: var(--bg-tertiary);
  overflow: hidden;
}

.work-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-smooth);
}

.work-card:hover .work-thumb {
  transform: scale(1.04);
}

/* 奖项缎带标签 (Award Tag) */
.work-award-badge {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  background: linear-gradient(to right, rgba(212, 175, 55, 0.95), rgba(212, 175, 55, 0.75));
  color: var(--text-dark);
  padding: 0.4rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  z-index: 5;
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.award-text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 播放小按钮 (Play Hover overlay) */
.work-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.9);
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--accent-gold), hsl(45, 60%, 45%));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dark);
  opacity: 0;
  box-shadow: 0 4px 15px rgba(0,0,0,0.4);
  transition: var(--transition-smooth);
  z-index: 10;
  cursor: pointer;
}

.play-arrow {
  font-size: 1.1rem;
  margin-left: 2px; /* 视觉微调微量偏右 */
}

.work-thumb-wrapper:hover .work-play-btn {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.work-play-btn:hover {
  background: var(--accent-gold-hover);
  box-shadow: 0 0 20px var(--accent-gold);
}

/* 未发布视频状态 */
.work-coming-soon-badge {
  position: absolute;
  bottom: 0.75rem;
  right: 0.75rem;
  background-color: rgba(11, 13, 23, 0.85);
  border: 1px solid var(--border-color);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--text-muted);
  backdrop-filter: var(--glass-blur);
}

.work-info {
  padding: 1.25rem;
}

.work-year {
  font-size: 0.8rem;
  color: var(--accent-gold);
  font-weight: 600;
}

.work-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-top: 0.25rem;
  color: #fff;
  line-height: 1.4;
}

/* ==========================================================================
   9. 照片图集 (Gallery waterfall grid & lightbox)
   ========================================================================== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.gallery-item {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: 10px;
  overflow: hidden;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
}

.gallery-item:hover {
  transform: scale(1.02);
  border-color: var(--border-gold);
  box-shadow: var(--shadow-lg);
}

.gallery-img-wrapper {
  width: 100%;
  height: 100%;
  position: relative;
}

.gallery-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-smooth);
}

.gallery-item:hover .gallery-img {
  transform: scale(1.05);
}

/* 图集遮罩层 */
.gallery-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, rgba(11,13,23,0.1), rgba(11,13,23,0.9));
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.5rem;
  opacity: 0;
  transition: var(--transition-smooth);
}

.zoom-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  font-size: 1.75rem;
  opacity: 0;
  transition: var(--transition-smooth);
}

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

.gallery-item:hover .zoom-icon {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.gallery-caption {
  font-size: 0.95rem;
  font-weight: 500;
  color: #fff;
  text-shadow: 0 1px 3px rgba(0,0,0,0.5);
  transform: translateY(10px);
  transition: var(--transition-smooth);
}

.gallery-item:hover .gallery-caption {
  transform: translateY(0);
}

/* 原生 Lightbox 样式 (Native Lightbox Overlay) */
.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(6, 7, 13, 0.95);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.3s ease;
  backdrop-filter: blur(10px);
}

.lightbox.hidden {
  display: none;
}

.lightbox-content-wrapper {
  position: relative;
  max-width: 90%;
  max-height: 80%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lightbox-img {
  max-width: 100%;
  max-height: 80vh;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: 0 10px 50px rgba(0,0,0,0.8);
  border: 1px solid var(--border-color);
  animation: zoom 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.lightbox-caption {
  color: var(--text-main);
  margin-top: 1.5rem;
  font-size: 1.05rem;
  text-align: center;
  font-weight: 500;
  text-shadow: 0 2px 10px rgba(0,0,0,0.8);
}

/* 关闭与翻页控件 */
.lightbox-close {
  position: absolute;
  top: 2rem;
  right: 2.5rem;
  font-size: 2.5rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition-fast);
  z-index: 2010;
}

.lightbox-close:hover {
  color: var(--accent-gold);
}

.lightbox-prev, .lightbox-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-size: 1.5rem;
  padding: 1rem 1.25rem;
  cursor: pointer;
  border-radius: 50%;
  transition: var(--transition-smooth);
  z-index: 2010;
}

.lightbox-prev:hover, .lightbox-next:hover {
  background: var(--accent-gold);
  color: var(--text-dark);
  box-shadow: 0 0 15px var(--accent-gold);
  border-color: var(--accent-gold);
}

.lightbox-prev { left: 2.5rem; }
.lightbox-next { right: 2.5rem; }

/* ==========================================================================
   10. 联系我们与表单 (Contact Section & Contact Form)
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 4rem;
  align-items: start;
}

.contact-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.contact-info-item {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.contact-icon-box {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--accent-gold);
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
}

.contact-info-item:hover .contact-icon-box {
  border-color: var(--accent-gold);
  box-shadow: 0 0 12px var(--accent-gold-rgba);
  transform: translateY(-2px);
}

.contact-info-content {
  display: flex;
  flex-direction: column;
}

.contact-info-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.contact-info-value {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 0.15rem;
}

.contact-link:hover {
  color: var(--accent-gold);
}

/* 留言表单 */
.contact-interactive {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.contact-form-box {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
}

.contact-form-title {
  font-family: var(--font-body);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: #fff;
}

.custom-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group input, .form-group textarea {
  width: 100%;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  padding: 0.9rem 1.25rem;
  border-radius: 8px;
  font-size: 0.95rem;
  color: #fff;
  transition: var(--transition-fast);
}

.form-group input:focus, .form-group textarea:focus {
  border-color: var(--accent-gold);
  box-shadow: 0 0 8px var(--accent-gold-rgba);
  background-color: var(--bg-secondary);
}

/* 微信二维码弹框 tooltip */
.social-links-area {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.social-links-title {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}

.social-buttons {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.social-icon-wrapper {
  position: relative;
}

.social-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-muted);
  transition: var(--transition-smooth);
}

.social-svg-icon {
  width: 20px;
  height: 20px;
}

.social-btn:hover {
  color: var(--accent-gold);
  border-color: var(--accent-gold);
  background-color: var(--bg-tertiary);
  transform: translateY(-3px);
  box-shadow: 0 4px 12px rgba(212, 175, 55, 0.2);
}

/* 微信悬浮框机制 (WeChat QR Code Tooltip) */
.wechat-qrcode-tooltip {
  position: absolute;
  bottom: 120%;
  left: 50%;
  transform: translateX(-50%) translateY(10px) scale(0.9);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-gold);
  border-radius: 12px;
  padding: 0.75rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition: var(--transition-smooth);
  width: 140px;
  height: 140px;
  z-index: 100;
}

.wechat-qrcode-tooltip img {
  width: 100%;
  height: 100%;
  border-radius: 4px;
}

.wechat-wrapper:hover .wechat-qrcode-tooltip {
  opacity: 1;
  transform: translateX(-50%) translateY(0) scale(1);
  pointer-events: auto;
}

/* 微信二维码缺失时的占位风格 */
.wechat-fallback {
  width: 100%;
  height: 100%;
  background: var(--bg-tertiary);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: var(--accent-gold);
}

/* 反馈状态消息框 */
.form-status-message {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
}

.form-status-message.success {
  background-color: rgba(46, 117, 89, 0.2);
  border: 1px solid rgba(46, 117, 89, 0.4);
  color: #5bb389;
}

.form-status-message.info {
  background-color: rgba(212, 175, 55, 0.1);
  border: 1px solid rgba(212, 175, 55, 0.2);
  color: var(--accent-gold);
}

/* ==========================================================================
   11. 页脚 (Footer Section)
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  padding: 3rem 0;
}

.footer-copy {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.footer-support {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
  opacity: 0.6;
}

/* ==========================================================================
   12. 媒体图片缺失优雅占位框 (Graceful Image Fallbacks CSS)
   ========================================================================== */
.image-fallback-active {
  width: 100%;
  height: 100%;
  display: flex !important;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
  text-align: center;
  padding: 1rem;
}

.basic-fallback {
  min-height: 200px;
}

.fallback-music-badge, .fallback-note-icon, .fallback-camera-icon {
  font-size: 2.5rem;
  color: var(--accent-gold);
  opacity: 0.8;
  animation: float 3s ease-in-out infinite;
}

/* 精美的音频占位卡片 (适用于 Works 作品封面缺失时) */
.work-thumb-fallback {
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: radial-gradient(circle, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
  padding: 1.5rem;
  text-align: center;
}

.fallback-note-text {
  font-size: 0.8rem;
  color: var(--text-muted);
  max-width: 90%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Logo 缺省 */
.fallback-logo-icon {
  font-size: 1.5rem;
  animation: float 2.5s ease-in-out infinite;
}

/* ==========================================================================
   13. 辅助动画 Keyframes
   ========================================================================== */
@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-6px); }
  100% { transform: translateY(0px); }
}

@keyframes pulse {
  0% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 0.9; transform: scale(1.05); }
  100% { opacity: 0.6; transform: scale(1); }
}

@keyframes zoom {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

/* ==========================================================================
   14. 响应式布局断点 (Responsive Layout Breakpoints)
   ========================================================================== */

/* 1. 中型屏 (Tablets: max-width: 1024px) */
@media screen and (max-width: 1024px) {
  html {
    font-size: 15px;
  }
  
  .section-padding {
    padding: 4.5rem 0;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .events-grid {
    gap: 2rem;
  }

  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 3.5rem;
  }

  .lightbox-prev { left: 1.5rem; }
  .lightbox-next { right: 1.5rem; }
  .lightbox-close { right: 1.5rem; }
}

/* 2. 手机屏 (Mobile Devices: max-width: 768px) */
@media screen and (max-width: 768px) {
  /* 移动端菜单激活时阻止溢出 */
  body.no-scroll {
    position: fixed;
    width: 100%;
  }

  /* 汉堡包按钮显示 */
  .menu-mobile-btn {
    display: flex;
  }

  /* 导航栏转化为全屏抽屉菜单 */
  .nav-links {
    position: fixed;
    top: 80px;
    left: 100%;
    width: 100%;
    height: calc(100vh - 80px);
    background-color: var(--bg-primary);
    flex-direction: column;
    justify-content: center;
    gap: 2.5rem;
    transition: var(--transition-smooth);
    z-index: 999;
    padding: 2rem;
  }

  .site-header.scrolled .nav-links {
    top: 70px;
    height: calc(100vh - 70px);
  }

  /* 菜单打开状态 */
  .nav-links.active {
    left: 0;
  }

  .nav-link {
    font-size: 1.35rem;
    font-weight: 600;
  }

  /* 汉堡包展开过渡 */
  .menu-mobile-btn.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  .menu-mobile-btn.active .bar:nth-child(2) {
    opacity: 0;
  }
  .menu-mobile-btn.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  /* 首页字号缩减 */
  .hero-title {
    font-size: 2.4rem;
    letter-spacing: 2px;
  }

  .hero-slogan {
    font-size: 1.05rem;
    letter-spacing: 3px;
    padding: 0 1rem;
  }

  /* 列表降为单列 */
  .events-grid {
    grid-template-columns: 1fr;
  }

  .works-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  }

  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .about-stats-banner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .contact-form-box {
    padding: 1.5rem;
  }

  /* 灯箱左右键位置调整 */
  .lightbox-prev, .lightbox-next {
    padding: 0.75rem 1rem;
    font-size: 1.25rem;
  }
}

/* 3. 极小屏幕 (Small Mobile: max-width: 480px) */
@media screen and (max-width: 480px) {
  .section-title {
    font-size: 1.8rem;
  }

  .about-leaders {
    padding: 1.5rem;
  }

  .event-poster-wrapper {
    height: 180px;
  }
}

/* 页脚技术支持链接悬浮样式 */
.footer-support .footer-link {
  color: var(--text-muted);
  text-decoration: underline;
  transition: var(--transition-fast);
}

.footer-support .footer-link:hover {
  color: var(--accent-gold);
  text-shadow: 0 0 8px var(--accent-gold-rgba);
}