/* ========================================
   沪壹公益文化服务中心 - 官方网站样式
   Huyi Public Welfare Cultural Service Center
   ======================================== */

/* 基础变量 */
:root {
  --primary-blue: #2563eb;
  --primary-purple: #7c3aed;
  --dark-bg: #0f172a;
  --dark-secondary: #1e293b;
  --dark-card: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --gradient-main: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  --gradient-subtle: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
  --border-color: rgba(148, 163, 184, 0.1);
  --glow-blue: rgba(37, 99, 235, 0.4);
  --glow-purple: rgba(124, 58, 237, 0.4);
  --font-cn: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-en: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* 重置与基础 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-cn);
  background: var(--dark-bg);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

img {
  max-width: 100%;
  height: auto;
}

/* ========================================
   导航栏
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 2rem;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  padding: 0.75rem 2rem;
  background: rgba(15, 23, 42, 0.95);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-sub {
  font-family: var(--font-en);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

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

.nav-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  position: relative;
  padding: 0.5rem 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-main);
  transition: width var(--transition-normal);
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links a:hover::after {
  width: 100%;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.lang-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  transition: all var(--transition-fast);
  font-family: var(--font-en);
}

.lang-btn:hover,
.lang-btn.active {
  color: var(--text-primary);
}

.lang-divider {
  color: var(--text-muted);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-fast);
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 70px;
  left: 0;
  right: 0;
  background: rgba(15, 23, 42, 0.98);
  padding: 2rem;
  flex-direction: column;
  gap: 1.5rem;
  z-index: 999;
  border-bottom: 1px solid var(--border-color);
}

.mobile-menu.active {
  display: flex;
}

.mobile-menu a {
  font-size: 1.1rem;
  color: var(--text-secondary);
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-color);
}

.mobile-lang {
  display: flex;
  gap: 1rem;
  padding-top: 1rem;
}

/* ========================================
   Hero 首屏
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #1e3a5f 0%, #0f172a 30%, #1a1033 70%, #0f172a 100%);
}

.hero-gradient::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 60%;
  background: radial-gradient(ellipse at 30% 20%, rgba(37, 99, 235, 0.15) 0%, transparent 60%);
}

.hero-gradient::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60%;
  background: radial-gradient(ellipse at 70% 80%, rgba(124, 58, 237, 0.12) 0%, transparent 60%);
}

.hero-particles {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 2rem;
  max-width: 900px;
}

.hero-badge {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 100px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  letter-spacing: 0.1em;
}

.hero-title {
  margin-bottom: 1.5rem;
}

.title-cn {
  display: block;
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  background: linear-gradient(135deg, #fff 0%, #e2e8f0 50%, #fff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

.title-en {
  display: block;
  font-family: var(--font-en);
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--text-secondary);
  margin-bottom: 2rem;
  letter-spacing: 0.2em;
}

.hero-year {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 3rem;
}

.year-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.year-number {
  font-family: var(--font-en);
  font-size: 2.5rem;
  font-weight: 700;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2rem;
  background: var(--gradient-main);
  border-radius: 100px;
  color: #fff;
  font-weight: 500;
  transition: all var(--transition-normal);
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.3);
}

.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(37, 99, 235, 0.4);
}

.hero-cta svg {
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(5px); }
  60% { transform: translateY(3px); }
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
}

.scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--primary-blue), transparent);
  animation: scrollLine 2s infinite;
}

@keyframes scrollLine {
  0% { opacity: 0; transform: scaleY(0); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); }
  100% { opacity: 0; transform: scaleY(1); transform-origin: bottom; }
}

/* ========================================
   通用区块样式
   ======================================== */
.section {
  padding: 6rem 2rem;
  position: relative;
}

.section-container {
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-tag {
  display: inline-block;
  padding: 0.4rem 1rem;
  background: var(--gradient-subtle);
  border: 1px solid var(--border-color);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--primary-blue);
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

.section-tag.light {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}

.section-title.light {
  color: #fff;
}

/* ========================================
   关于我们
   ======================================== */
.about {
  background: var(--dark-bg);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 4rem;
  align-items: center;
}

.about-main {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 2.5rem;
}

.about-features {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.feature-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-subtle);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.feature-icon svg {
  stroke: var(--primary-blue);
}

.feature-text h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.feature-text p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.visual-card {
  position: relative;
  background: var(--gradient-main);
  border-radius: 24px;
  padding: 3rem;
  text-align: center;
  overflow: hidden;
}

.card-glow {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
  animation: rotate 20s linear infinite;
}

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

.card-content {
  position: relative;
  z-index: 1;
}

.stat-number {
  font-family: var(--font-en);
  font-size: 4rem;
  font-weight: 700;
  color: #fff;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.8);
}

/* ========================================
   主营业务
   ======================================== */
.services {
  background: var(--dark-secondary);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.service-card {
  background: var(--dark-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  transition: all var(--transition-normal);
}

.service-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary-blue);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.card-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient-subtle);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.card-icon svg {
  stroke: var(--primary-blue);
}

.service-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.service-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ========================================
   时间线
   ======================================== */
.timeline {
  background: var(--dark-bg);
}

.timeline-container {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline-line {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary-blue), var(--primary-purple));
  transform: translateX(-50%);
}

.timeline-items {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.timeline-item {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.timeline-item:nth-child(odd) {
  flex-direction: row-reverse;
  text-align: right;
}

.timeline-year {
  font-family: var(--font-en);
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  min-width: 80px;
  position: relative;
}

.timeline-year::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  background: var(--dark-bg);
  border: 3px solid var(--primary-blue);
  border-radius: 50%;
  top: 50%;
  transform: translateY(-50%);
}

.timeline-item:nth-child(odd) .timeline-year::after {
  left: -2.5rem;
}

.timeline-item:nth-child(even) .timeline-year::after {
  right: -2.5rem;
}

.timeline-content {
  flex: 1;
  max-width: 300px;
  background: var(--dark-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
}

.timeline-content h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.timeline-content p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ========================================
   服务理念
   ======================================== */
.philosophy {
  position: relative;
  overflow: hidden;
}

.philosophy-bg {
  position: absolute;
  inset: 0;
  background: var(--gradient-main);
  opacity: 0.95;
}

.philosophy-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.philosophy .section-container {
  position: relative;
  z-index: 1;
}

.philosophy-content {
  text-align: center;
}

.philosophy-cards {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 4rem;
  flex-wrap: wrap;
}

.philosophy-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 16px;
  padding: 2rem;
  min-width: 200px;
  transition: all var(--transition-normal);
}

.philosophy-card:hover {
  transform: translateY(-5px);
  background: rgba(255, 255, 255, 0.15);
}

.phi-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.philosophy-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 0.5rem;
}

.philosophy-card p {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.8);
}

.philosophy-quote {
  max-width: 700px;
  margin: 0 auto;
}

.philosophy-quote blockquote {
  position: relative;
}

.quote-text {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 500;
  color: #fff;
  line-height: 1.6;
  font-style: italic;
}

.quote-text::before,
.quote-text::after {
  content: '"';
  font-size: 3rem;
  color: rgba(255, 255, 255, 0.3);
  position: absolute;
}

.quote-text::before {
  top: -1rem;
  left: -1rem;
}

.quote-text::after {
  bottom: -2rem;
  right: -1rem;
}

/* ========================================
   联系我们
   ======================================== */
.contact {
  background: var(--dark-secondary);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

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

.contact-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.contact-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-subtle);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-icon svg {
  stroke: var(--primary-blue);
}

.contact-text h4 {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.contact-text a,
.contact-text p {
  font-size: 1.1rem;
  color: var(--text-primary);
}

.contact-text a:hover {
  color: var(--primary-blue);
}

.contact-cta {
  background: var(--dark-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 3rem;
  text-align: center;
}

.contact-cta > p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.6;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2rem;
  background: var(--gradient-main);
  border-radius: 100px;
  color: #fff;
  font-weight: 500;
  transition: all var(--transition-normal);
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.3);
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(37, 99, 235, 0.4);
}

/* ========================================
   页脚
   ======================================== */
.footer {
  background: var(--dark-bg);
  border-top: 1px solid var(--border-color);
  padding: 3rem 2rem 2rem;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-main {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.footer-logo .logo-icon {
  width: 32px;
  height: 32px;
}

.footer-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 2rem;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.copyright,
.icp {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .about-visual {
    order: -1;
    max-width: 300px;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .nav-links,
  .lang-switch {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

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

  .timeline-line {
    left: 20px;
  }

  .timeline-item,
  .timeline-item:nth-child(odd) {
    flex-direction: column;
    text-align: left;
    align-items: flex-start;
    padding-left: 50px;
  }

  .timeline-year::after,
  .timeline-item:nth-child(odd) .timeline-year::after,
  .timeline-item:nth-child(even) .timeline-year::after {
    left: -38px;
    right: auto;
  }

  .timeline-content {
    max-width: 100%;
  }

  .philosophy-cards {
    flex-direction: column;
    align-items: center;
  }

  .philosophy-card {
    width: 100%;
    max-width: 300px;
  }

  .contact-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-main {
    flex-direction: column;
    gap: 2rem;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }

  .section {
    padding: 4rem 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero-content {
    padding: 1rem;
  }

  .hero-cta {
    padding: 0.875rem 1.5rem;
  }

  .visual-card {
    padding: 2rem;
  }

  .stat-number {
    font-size: 3rem;
  }
}

/* ========================================
   动画效果
   ======================================== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

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

/* 粒子动画背景 */
.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  animation: float-particle 15s infinite;
}

@keyframes float-particle {
  0%, 100% {
    transform: translateY(0) translateX(0);
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    transform: translateY(-100vh) translateX(50px);
    opacity: 0;
  }
}

/* ========================================
   精彩瞬间 - WebGL 3D画廊（样式在 gallery.css）
   ======================================== */