/* ==================== 基础设置 ==================== */
:root {
    /* 配色方案 - 深色主题 */
    --color-primary: #10b981;
    --color-primary-dark: #059669;
    --color-primary-light: #34d399;
    --color-secondary: #00ff88;
    --color-bg-dark: #0a0a0a;
    --color-bg-darker: #050505;
    --color-bg-gray: #1a1a1a;
    --color-bg-gray-light: #2a2a2a;
    --color-text-primary: #ffffff;
    --color-text-secondary: #a0a0a0;
    --color-text-muted: #666666;
    --color-border: rgba(255, 255, 255, 0.1);
    
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #10b981 0%, #00ff88 100%);
    --gradient-glow: radial-gradient(circle, rgba(16, 185, 129, 0.15) 0%, transparent 70%);
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 40px rgba(16, 185, 129, 0.3);
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* 字体 */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 浅色主题 */
[data-theme="light"] {
    --color-bg-dark: #ffffff;
    --color-bg-darker: #f8f9fa;
    --color-bg-gray: #f0f2f5;
    --color-bg-gray-light: #e8eaed;
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #5f6368;
    --color-text-muted: #9aa0a6;
    --color-border: rgba(0, 0, 0, 0.08);
    
    /* 浅色主题阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 40px rgba(16, 185, 129, 0.2);
    
    /* 浅色主题渐变 */
    --gradient-glow: radial-gradient(circle, rgba(16, 185, 129, 0.08) 0%, transparent 70%);
}

/* 浅色主题特殊样式 */
[data-theme="light"] .navbar {
    background: rgba(255, 255, 255, 0.8);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
}

[data-theme="light"] .mobile-menu {
    background: rgba(255, 255, 255, 0.98);
}

[data-theme="light"] .gradient-orb {
    opacity: 0.15;
}

[data-theme="light"] .btn-secondary {
    background: rgba(0, 0, 0, 0.03);
    border-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .btn-secondary:hover {
    background: rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .stat-item,
[data-theme="light"] .feature-card,
[data-theme="light"] .community-card,
[data-theme="light"] .modal-content {
    background: rgba(0, 0, 0, 0.02);
    border-color: rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .stat-item:hover,
[data-theme="light"] .feature-card:hover {
    background: rgba(0, 0, 0, 0.04);
}

[data-theme="light"] .discussion-item {
    background: rgba(0, 0, 0, 0.02);
}

[data-theme="light"] .discussion-item:hover {
    background: rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .footer {
    background: #000000;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

[data-theme="light"] .footer * {
    color: var(--color-text-secondary);
}

[data-theme="light"] .footer .logo-text,
[data-theme="light"] .footer h4,
[data-theme="light"] .footer .footer-copyright {
    color: #ffffff;
}

[data-theme="light"] .footer a:hover {
    color: var(--color-primary);
}

[data-theme="light"] .footer-social a {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
}

[data-theme="light"] .footer-extra {
    border-top-color: rgba(255, 255, 255, 0.1);
}

[data-theme="light"] .footer-icp a,
[data-theme="light"] .footer-sponsor a,
[data-theme="light"] .footer-sponsor .sponsor-label {
    color: #999999;
}

[data-theme="light"] .footer-icp a:hover,
[data-theme="light"] .footer-sponsor a:hover {
    color: var(--color-primary);
}

[data-theme="light"] .footer-social a:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

[data-theme="light"] .modal-overlay {
    background: rgba(255, 255, 255, 0.9);
}

[data-theme="light"] .modal-close:hover {
    background: rgba(255, 0, 0, 0.05);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

/* ==================== 导航栏 ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-smooth);
}

.navbar.scrolled {
    background: rgba(10, 10, 10, 0.95);
    box-shadow: var(--shadow-md);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 700;
    cursor: pointer;
}

.logo-icon {
    font-size: 28px;
    color: var(--color-primary);
    filter: drop-shadow(0 0 10px rgba(16, 185, 129, 0.5));
}

.logo-image {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.logo-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-links a {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-secondary);
    position: relative;
    padding: 8px 0;
}

.nav-links a:not(.btn-primary):hover {
    color: var(--color-text-primary);
}

.nav-links a:not(.btn-primary)::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-smooth);
}

.nav-links a:not(.btn-primary):hover::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-text-primary);
    font-size: 24px;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transform: translateY(-100%);
    opacity: 0;
    transition: var(--transition-smooth);
    z-index: 999;
    border-bottom: 1px solid var(--color-border);
}

.mobile-menu.active {
    transform: translateY(0);
    opacity: 1;
}

.mobile-menu-content {
    display: flex;
    flex-direction: column;
    padding: var(--spacing-md);
    gap: var(--spacing-sm);
}

.mobile-menu-content a {
    padding: var(--spacing-sm);
    text-align: center;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.mobile-menu-content a:hover {
    background: var(--color-bg-gray);
}

/* ==================== 按钮 ==================== */
.btn-primary {
    padding: 16px 36px;
    background: var(--gradient-primary);
    color: white !important;
    border-radius: var(--radius-xl);
    font-weight: 600;
    font-size: 15px;
    box-shadow: 0 4px 16px rgba(16, 185, 129, 0.3);
    transition: var(--transition-smooth);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
    line-height: 1.5;
    min-width: 120px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(16, 185, 129, 0.4);
}

.btn-secondary {
    padding: 12px 28px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--color-text-primary);
    border-radius: var(--radius-xl);
    font-weight: 600;
    font-size: 15px;
    border: 1px solid var(--color-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: var(--transition-smooth);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.btn-hero {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px 36px;
    background: var(--gradient-primary);
    color: white !important;
    border-radius: var(--radius-xl);
    font-weight: 600;
    font-size: 16px;
    box-shadow: 0 8px 32px rgba(16, 185, 129, 0.4);
    transition: var(--transition-smooth);
    white-space: nowrap;
}

.btn-hero:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(16, 185, 129, 0.5);
}

.btn-hero i {
    font-size: 18px;
    transition: transform var(--transition-smooth);
}

.btn-hero:hover i {
    transform: translateX(4px);
}

.btn-large {
    padding: 20px 48px;
    font-size: 18px;
}

/* ==================== Hero 区域 ==================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 80px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.3;
    animation: float 20s infinite ease-in-out;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, #10b981 0%, transparent 70%);
    top: -200px;
    left: -200px;
    animation-delay: 0s;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, #00ff88 0%, transparent 70%);
    bottom: -150px;
    right: -150px;
    animation-delay: 5s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, #34d399 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(50px, -50px) scale(1.1);
    }
    66% {
        transform: translate(-50px, 50px) scale(0.9);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-lg) 0;
}

.hero-icon {
    font-size: 64px;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    animation: pulse 3s infinite ease-in-out;
    filter: drop-shadow(0 0 20px rgba(16, 185, 129, 0.6));
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.8;
    }
}

.hero-title {
    font-size: clamp(36px, 6vw, 72px);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    display: inline-block;
}

.hero-subtitle {
    font-size: clamp(16px, 2vw, 20px);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    max-width: 600px;
    margin: 0 auto;
}

.stat-item {
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: var(--transition-smooth);
}

.stat-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-primary);
    transform: translateY(-4px);
}

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 14px;
    color: var(--color-text-secondary);
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 24px;
    color: var(--color-primary);
    animation: bounce 2s infinite;
    cursor: pointer;
}

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

/* ==================== 区块标题 ==================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.01em;
}

.section-subtitle {
    font-size: 18px;
    color: var(--color-text-secondary);
}

/* ==================== 功能特色区 ==================== */
.features {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(180deg, var(--color-bg-dark) 0%, var(--color-bg-gray) 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.feature-card {
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: var(--transition-smooth);
}

.feature-card:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: var(--color-primary);
    transform: translateY(-8px);
    box-shadow: var(--shadow-glow);
}

.feature-icon {
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-glow);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    font-size: 32px;
    color: var(--color-primary);
    transition: var(--transition-smooth);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: var(--shadow-glow);
}

.feature-title {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.feature-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ==================== 社区预览区 ==================== */
.community {
    padding: var(--spacing-xl) 0;
    background: var(--color-bg-darker);
}

.community-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.community-badge {
    display: inline-block;
    padding: 8px 16px;
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-xl);
    font-size: 13px;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.community-title {
    font-size: clamp(28px, 3vw, 42px);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.community-description {
    font-size: 17px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.community-features {
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

.community-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
    font-size: 16px;
    color: var(--color-text-secondary);
}

.community-features i {
    color: var(--color-primary);
    font-size: 20px;
    flex-shrink: 0;
}

.community-visual {
    position: relative;
}

.community-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--spacing-md);
}

.card-header i {
    color: var(--color-primary);
    font-size: 24px;
}

.card-header span {
    font-size: 18px;
    font-weight: 600;
}

.faq-item {
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
}

.faq-question {
    display: flex;
    align-items: center;
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 8px;
}

.faq-question i {
    color: var(--color-primary);
    margin-right: 10px;
    font-size: 14px;
}

.faq-answer {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-left: 24px;
    line-height: 1.5;
}

/* ==================== CTA 区域 ==================== */
.cta {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(0, 255, 136, 0.05) 100%);
    position: relative;
    overflow: hidden;
}

.cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 50%, rgba(16, 185, 129, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.cta-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.cta-title {
    font-size: clamp(28px, 4vw, 48px);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.cta-subtitle {
    font-size: 18px;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* Footer styles */
.footer {
  padding: 2rem 0;
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.footer-logo-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 24px;
  font-weight: 700;
}

.footer-logo .logo-icon {
  font-size: 28px;
  color: var(--color-primary);
}

.footer-logo .logo-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-links-simple {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  padding: 1rem 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  width: 100%;
}

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

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

.footer-bottom {
  width: 100%;
}

.footer-copyright {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.footer-copyright a {
   display: inline-block;
   font-size: 12px;
   color: var(--color-text-muted);
   text-decoration: none;
   cursor: pointer;
 }

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

.qrcode-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    display: none;
    justify-content: center;
    align-items: center;
    background-color: rgba(0, 0, 0, 0.01); /* 几乎透明的背景，为了捕获点击事件 */
}

.qrcode-modal.active {
    display: flex;
}

.qrcode-modal-content {
    background-color: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    width: 90%;
    max-width: 320px;
    padding: 24px;
    transform: scale(0.9) translateY(0);
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
    position: relative; /* 确保定位正确 */
    margin: 0 auto; /* 额外的水平居中保障 */
}

.qrcode-modal.active .qrcode-modal-content {
    transform: scale(1) translateY(0);
    opacity: 1;
    position: relative;
    z-index: 10000; /* 确保内容在最上层 */
}

.qrcode-modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: none;
    border: none;
    font-size: 20px;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: 50%;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.qrcode-modal-close:hover {
    background-color: var(--color-background-alt);
    color: var(--color-text-primary);
}

.qrcode-modal-header {
    text-align: center;
    margin-bottom: 20px;
}

.qrcode-modal-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
}

.qrcode-modal-body {
    text-align: center;
}

.qrcode-modal-text {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 20px;
    line-height: 1.5;
}

.qrcode-image-container {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    background-color: white;
    border-radius: 8px;
    margin-bottom: 10px;
}

.qrcode-image-container img {
    max-width: 200px;
    max-height: 200px;
    object-fit: contain;
}

/* Responsive styles for QR code modal */
@media (max-width: 768px) {
    .qrcode-modal-content {
        width: 95%;
        max-width: 280px;
        padding: 20px;
    }
    
    .qrcode-image-container img {
        max-width: 180px;
        max-height: 180px;
    }
}

/* Responsive footer styles */
@media (max-width: 768px) {
  .footer {
    padding: 1.5rem 0;
  }
  
  .footer-logo-container {
    flex-direction: column;
    justify-content: center;
    gap: 1rem;
  }
  
  .footer-links-simple {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem 2rem;
    padding: 1rem 0;
  }
  
  .footer-links-simple a {
     width: 45%;
     text-align: center;
     font-size: 0.95rem;
    }
  
  .footer-copyright {
    font-size: 0.8rem;
  }
}

/* ==================== 模态弹窗 ==================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    animation: fadeIn 0.3s ease;
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 800px;
    max-height: 80vh;
    background: var(--color-bg-gray);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease;
    display: flex;
    flex-direction: column;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: 50%;
    color: var(--color-text-secondary);
    font-size: 20px;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
}

.modal-close:hover {
    background: rgba(255, 0, 0, 0.1);
    border-color: #ff4444;
    color: #ff4444;
}

.modal-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.modal-title {
    font-size: 24px;
    font-weight: 700;
    padding-right: 40px;
}

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
    flex: 1;
}

.modal-text {
    color: var(--color-text-secondary);
    line-height: 1.8;
    font-size: 15px;
}

.modal-text h3 {
    color: var(--color-text-primary);
    font-size: 20px;
    margin: var(--spacing-md) 0 var(--spacing-sm);
}

.modal-text h3:first-child {
    margin-top: 0;
}

.modal-text p {
    margin-bottom: var(--spacing-md);
}

.modal-text ul, .modal-text ol {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-lg);
}

.modal-text li {
    margin-bottom: var(--spacing-sm);
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .community-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .footer-main {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }
    
    .hero-cta a {
        text-align: center;
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    /* Footer 手风琴样式 */
    .footer-links {
        grid-template-columns: 1fr;
        gap: 0;
    }
    
    .footer-column {
        border-bottom: 1px solid var(--color-border);
        padding: 0;
    }
    
    .footer-column:last-child {
        border-bottom: none;
    }
    
    .footer-column h4 {
        cursor: pointer;
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: var(--spacing-md) 0;
        margin-bottom: 0;
        user-select: none;
    }
    
    .footer-column h4::after {
        content: '\f078';
        font-family: 'Font Awesome 6 Free';
        font-weight: 900;
        font-size: 14px;
        transition: transform var(--transition-smooth);
        color: var(--color-primary);
    }
    
    .footer-column.active h4::after {
        transform: rotate(180deg);
    }
    
    .footer-column .footer-links-content {
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-smooth);
    }
    
    .footer-column.active .footer-links-content {
        max-height: 300px;
        padding-bottom: var(--spacing-md);
    }
    
    .footer-column .footer-links-content a {
        opacity: 0;
        transform: translateY(-10px);
        transition: opacity var(--transition-smooth), transform var(--transition-smooth);
    }
    
    .footer-column.active .footer-links-content a {
        opacity: 1;
        transform: translateY(0);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
        align-items: center;
    }
    
    .footer-legal {
        display: flex;
        flex-direction: row;
        flex-wrap: wrap;
        gap: var(--spacing-sm);
        width: 100%;
        justify-content: center;
        align-items: center;
    }
    
    .legal-link {
        font-size: 13px;
        padding: 8px 12px;
        flex-shrink: 0;
    }
    
    .legal-link i {
        font-size: 14px;
    }
    
    .legal-link span {
        display: inline;
    }
    
    /* 修复移动端主题按钮 */
    .theme-toggle {
        width: 44px !important;
        height: 44px !important;
        padding: 0 !important;
        border-radius: 50% !important;
        margin: var(--spacing-sm) auto !important;
        flex-basis: auto !important;
        max-width: none !important;
        min-width: auto !important;
        display: flex !important;
        align-items: center;
        justify-content: center;
        background: rgba(16, 185, 129, 0.1) !important;
        border: 1px solid var(--color-primary) !important;
        font-size: 20px !important;
        transition: var(--transition-smooth) !important;
        color: var(--color-primary) !important;
    }

    .theme-toggle:hover {
        background: var(--color-primary) !important;
        color: white !important;
        transform: rotate(180deg) scale(1.1) !important;
    }

    /* 完全隐藏移动端的文字标签 */
    .theme-toggle::after {
        display: none !important;
        content: none !important;
    }

    .theme-toggle i {
        font-size: 20px !important;
        margin: 0 !important;
        display: block !important;
    }
    
    /* 确保 footer-legal 正确布局 */
    .footer-legal {
        display: flex;
        flex-direction: row;
        flex-wrap: wrap;
        gap: var(--spacing-sm);
        width: 100%;
        justify-content: center;
        align-items: center;
    }
    
    /* Footer Extra 移动端样式 */
    .footer-extra {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    .footer-icp {
        flex-direction: column;
        gap: 8px;
    }
    
    .footer-sponsor {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    /* 返回顶部按钮在移动端 */
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 48px;
        height: 48px;
        font-size: 18px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .btn-large {
        padding: 16px 32px;
        font-size: 16px;
    }
    
    .legal-link {
        font-size: 12px;
        padding: 6px 10px;
    }
    
    .theme-toggle {
        padding: 10px 20px;
        min-width: 130px;
        font-size: 13px;
    }
    
    .theme-toggle i {
        font-size: 14px;
    }
    
    .theme-toggle::after {
        font-size: 13px;
    }
}

/* ==================== 自定义滚动条 ==================== */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-darker);
}

::-webkit-scrollbar-thumb {
    background: var(--color-bg-gray-light);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}

/* ==================== 加载动画 ==================== */
@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

/* ==================== 打印样式 ==================== */
@media print {
    .navbar,
    .mobile-menu,
    .scroll-indicator,
    .footer {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
}

/* ==================== 主题切换按钮 ==================== */
.theme-toggle {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--color-primary);
    border-radius: 50%;
    color: var(--color-primary);
    font-size: 20px;
    cursor: pointer;
    transition: var(--transition-smooth);
    margin-left: var(--spacing-md);
}

.theme-toggle:hover {
    background: var(--color-primary);
    color: white;
    transform: rotate(180deg) scale(1.1);
}

/* 桌面端不显示文字 */
.theme-toggle::after {
    content: '';
    display: none;
}

/* ==================== 返回顶部按钮 ==================== */
.back-to-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 20px;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(16, 185, 129, 0.4);
    transition: var(--transition-smooth);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 28px rgba(16, 185, 129, 0.5);
}

.back-to-top:active {
    transform: translateY(-2px);
}

/* ==================== Footer 手风琴（移动端） ==================== */
.footer-column.accordion {
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--spacing-sm);
}

.footer-column.accordion h4 {
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    margin-bottom: 0;
    user-select: none;
}

.footer-column.accordion h4::after {
    content: '\f078';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 14px;
    transition: transform var(--transition-smooth);
}

.footer-column.accordion.active h4::after {
    transform: rotate(180deg);
}

.footer-column.accordion .footer-links-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-smooth);
}

.footer-column.accordion.active .footer-links-content {
    max-height: 300px;
}