/********************************************************************
 *  Node404 - 高端极客刀锋版样式
 *  黑白零容忍 · JetBrains Mono · 极简未来感
 *******************************************************************/

/* ===== CSS变量定义 ===== */
:root {
  /* 核心色彩 - 黑白零容忍 */
  --black: #000000;
  --white: #FFFFFF;
  --gray-50: #F8F9FA;
  --gray-100: #E9ECEF;
  --gray-200: #DEE2E6;
  --gray-300: #CED4DA;
  --gray-400: #ADB5BD;
  --gray-500: #6C757D;
  --gray-600: #495057;
  --gray-700: #343A40;
  --gray-800: #212529;
  --gray-900: #1A1D20;
  
  /* 字体系统 */
  --mono: 'JetBrains Mono', 'Consolas', 'Monaco', 'Lucida Console', monospace;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  /* 过渡动画 */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* 布局系统 */
  --container-max: 1200px;
  --section-padding: 4rem 2rem;
  --border-radius: 0;
  --border-width: 2px;
  
  /* 阴影系统 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
  
  /* 动画 */
  --animate-fade-in: fadeIn 0.6s ease-out;
  --animate-slide-up: slideUp 0.6s ease-out;
  --animate-glow: glow 2s ease-in-out infinite alternate;
}

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

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

body {
  font-family: var(--mono);
  background: var(--white);
  color: var(--black);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 字体导入 */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ===== 排版系统 ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--mono);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

p {
  margin-bottom: 1rem;
  font-size: 1rem;
}

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

a:hover {
  opacity: 0.8;
}

/* ===== 按钮系统 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-family: var(--mono);
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: var(--border-width) solid var(--black);
  background: var(--white);
  color: var(--black);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.btn:hover {
  background: var(--black);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--black);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--white);
  color: var(--black);
}

.btn-outline {
  background: transparent;
}

.btn-ghost {
  border-color: transparent;
  background: transparent;
}

.btn-ghost:hover {
  border-color: var(--black);
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--white);
  border-bottom: var(--border-width) solid var(--black);
  backdrop-filter: blur(10px);
}

.navbar-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.nav-logo .logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.navbar-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.navbar-link {
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.5rem 0;
  position: relative;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.5rem 0;
  position: relative;
}

.navbar-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--black);
  transition: var(--transition);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--black);
  transition: var(--transition);
}

.navbar-link:hover::after {
  width: 100%;
}

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

.nav-actions .nav-cta {
  padding: 0.5rem 1rem;
  font-family: var(--mono);
  font-size: 0.875rem;
  text-transform: uppercase;
  border: var(--border-width) solid var(--black);
  background: var(--white);
  color: var(--black);
  cursor: pointer;
  transition: var(--transition);
}

.nav-actions .nav-cta:hover {
  background: var(--black);
  color: var(--white);
}

/* ===== Hero区域 ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--section-padding);
  padding-top: 6rem;
  background: linear-gradient(135deg, var(--white) 0%, var(--gray-50) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 80%, rgba(0,0,0,0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(0,0,0,0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  text-align: center;
  max-width: 800px;
  z-index: 2;
  position: relative;
}

.hero-visual {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.hero-404 {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 800;
  letter-spacing: 0.1em;
}

.hero-genesis {
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 700;
  letter-spacing: 0.15em;
}

.hero-title {
  margin-bottom: 1.5rem;
  animation: var(--animate-fade-in);
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.8;
  animation: var(--animate-slide-up);
  animation-delay: 0.2s;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  animation: var(--animate-slide-up);
  animation-delay: 0.4s;
}

.btn-secondary {
  border: var(--border-width) solid var(--black);
  background: var(--white);
  color: var(--black);
}

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

.btn-support {
  border: var(--border-width) solid #e74c3c;
  background: #e74c3c;
  color: var(--white);
  text-decoration: none;
}

.btn-support:hover {
  background: #c0392b;
  border-color: #c0392b;
  color: var(--white);
}

.nav-support {
  background: linear-gradient(135deg, #ff6b6b, #e74c3c) !important;
  color: #fff !important;
  font-weight: 700;
  padding: 0.5rem 1rem !important;
  border-radius: 4px;
  animation: supportPulse 2s ease-in-out infinite;
}

.nav-support:hover {
  background: linear-gradient(135deg, #ff5252, #c0392b) !important;
  color: #fff !important;
  transform: scale(1.05);
}

@keyframes supportPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(231, 76, 60, 0.4); }
  50% { box-shadow: 0 0 0 8px rgba(231, 76, 60, 0); }
}

/* ===== 捐赠弹窗 ===== */
.donate-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  z-index: 10000;
  justify-content: center;
  align-items: center;
}

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

.donate-modal-content {
  background: var(--white);
  border: 4px solid var(--black);
  padding: 2rem;
  max-width: 700px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  animation: modalSlideIn 0.3s ease;
}

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

.donate-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  border-bottom: 2px solid var(--black);
  padding-bottom: 1rem;
}

.donate-modal-header h3 {
  font-size: 1.5rem;
  margin: 0;
}

.close-donate {
  background: none;
  border: none;
  font-size: 2rem;
  cursor: pointer;
  line-height: 1;
}

.close-donate:hover {
  color: #e74c3c;
}

.donate-desc {
  text-align: center;
  margin-bottom: 1.5rem;
  color: #666;
}

.donate-wallets {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1rem;
}

.donate-wallet-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem;
  border: 2px solid var(--black);
  transition: all 0.2s;
}

.donate-wallet-card:hover {
  transform: translateY(-4px);
  box-shadow: 4px 4px 0 var(--black);
}

.donate-wallet-card img {
  width: 100%;
  max-width: 120px;
  height: auto;
  margin-bottom: 0.5rem;
}

.donate-wallet-card span {
  font-weight: 700;
  font-family: var(--mono);
}

/* ===== 卡片系统 ===== */
.card {
  background: var(--white);
  border: var(--border-width) solid var(--black);
  padding: 2rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--black);
  transform: scaleX(0);
  transition: var(--transition);
}

.card:hover::before {
  transform: scaleX(1);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.card-content {
  color: var(--gray-700);
  line-height: 1.6;
}

/* ===== 网格系统 ===== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 2rem;
}

.grid {
  display: grid;
  gap: 2rem;
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.mission-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.mission-card {
  background: var(--white);
  border: var(--border-width) solid var(--black);
  padding: 2rem;
  transition: var(--transition);
}

.mission-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* ===== 区块样式 ===== */
.section {
  padding: var(--section-padding);
}

.section-dark {
  background: var(--black);
  color: var(--white);
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

/* ===== 页脚 ===== */
.footer {
  background: var(--black);
  color: var(--white);
  padding: 3rem 2rem 1rem;
  text-align: center;
}

.floating-issue-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1000;
  padding: 0.75rem 1rem;
  border: var(--border-width) solid var(--black);
  background: var(--black);
  color: var(--white);
  font-family: var(--mono);
}

.footer-content {
  max-width: var(--container-max);
  margin: 0 auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-link {
  color: var(--white);
  opacity: 0.8;
}

.footer-link:hover {
  opacity: 1;
}

/* ===== 动画定义 ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes glow {
  from {
    box-shadow: 0 0 5px rgba(0,0,0,0.2);
  }
  to {
    box-shadow: 0 0 20px rgba(0,0,0,0.4);
  }
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
  .navbar-menu {
    display: none;
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .section {
    padding: 3rem 1rem;
  }
}

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

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }

.hidden { display: none; }
.visible { display: block; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }

.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }
.gap-4 { gap: 2rem; }

.w-full { width: 100%; }
.h-full { height: 100%; }

.rounded { border-radius: 0.25rem; }
.rounded-lg { border-radius: 0.5rem; }
.rounded-xl { border-radius: 1rem; }

/********************************************************************
 *  互动模块样式
 *  弹幕、投票墙、Issue面板
 *******************************************************************/

/* ===== 弹幕系统 ===== */
.barrage-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 100vh;
  pointer-events: none;
  z-index: 999;
  overflow: hidden;
}

.barrage-item {
  position: absolute;
  white-space: nowrap;
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 500;
  color: var(--black);
  background: var(--white);
  padding: 0.5rem 1rem;
  border: 2px solid var(--black);
  box-shadow: var(--shadow-md);
  animation: barrageMove 10s linear infinite;
  pointer-events: auto;
}

@keyframes barrageMove {
  from {
    transform: translateX(100vw);
  }
  to {
    transform: translateX(-100%);
  }
}

.barrage-input-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1000;
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.barrage-input {
  padding: 0.75rem 1rem;
  font-family: var(--mono);
  font-size: 0.875rem;
  border: 2px solid var(--black);
  background: var(--white);
  color: var(--black);
  outline: none;
  transition: var(--transition);
}

.barrage-input:focus {
  box-shadow: 0 0 0 3px rgba(0,0,0,0.1);
}

.barrage-send-btn {
  padding: 0.75rem 1.5rem;
  font-family: var(--mono);
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  border: 2px solid var(--black);
  background: var(--black);
  color: var(--white);
  cursor: pointer;
  transition: var(--transition);
}

.barrage-send-btn:hover {
  background: var(--white);
  color: var(--black);
}

.danmaku-container {
  position: fixed;
  top: 8vh;
  left: 0;
  right: 0;
  height: 40vh;
  pointer-events: none;
  z-index: 999;
  overflow: hidden;
}

.danmaku-item {
  position: absolute;
  white-space: nowrap;
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 500;
  color: var(--black);
  background: var(--white);
  padding: 0.5rem 1rem;
  border: 2px solid var(--black);
  box-shadow: var(--shadow-md);
  animation: barrageMove 18s linear infinite;
  pointer-events: none;
}

.danmaku-donate {
  background: linear-gradient(135deg, #ff6b6b, #e74c3c);
  color: var(--white) !important;
  border: 3px solid #fff;
  pointer-events: auto;
  font-size: 1.2rem;
  font-weight: 700;
  padding: 0.6rem 1.2rem;
  box-shadow: 0 4px 15px rgba(231, 76, 60, 0.5);
  animation: barrageMove 18s linear infinite, donatePulse 1.5s ease-in-out infinite;
}

.danmaku-donate:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(231, 76, 60, 0.6);
}

@keyframes donatePulse {
  0%, 100% { box-shadow: 0 4px 15px rgba(231, 76, 60, 0.5); }
  50% { box-shadow: 0 4px 25px rgba(231, 76, 60, 0.8); }
}

.danmaku-input {
  position: fixed;
  bottom: 6rem;
  left: 2rem;
  z-index: 1000;
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.danmaku-input input {
  padding: 0.75rem 1rem;
  font-family: var(--mono);
  font-size: 0.875rem;
  border: 2px solid var(--black);
  background: var(--white);
  color: var(--black);
  outline: none;
  transition: var(--transition);
}

.danmaku-input input:focus {
  box-shadow: 0 0 0 3px rgba(0,0,0,0.1);
}

.danmaku-toggle {
  position: fixed;
  bottom: 2rem;
  left: 2rem;
  z-index: 1000;
}

.danmaku-toggle .toggle-btn {
  padding: 0.75rem 1.5rem;
  font-family: var(--mono);
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  border: 2px solid var(--black);
  background: var(--black);
  color: var(--white);
  cursor: pointer;
  transition: var(--transition);
}

.danmaku-toggle .toggle-btn:hover {
  background: var(--white);
  color: var(--black);
}

.voting-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.vote-card {
  background: var(--white);
  border: var(--border-width) solid var(--black);
  padding: 1.5rem;
  transition: var(--transition);
}

.vote-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.vote-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.vote-count {
  font-family: var(--mono);
  font-weight: 700;
}

.vote-btn {
  padding: 0.5rem 1rem;
  font-family: var(--mono);
  border: var(--border-width) solid var(--black);
  background: var(--white);
  cursor: pointer;
}

.vote-btn:hover {
  background: var(--black);
  color: var(--white);
}

.experiments-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.experiment-card {
  background: var(--white);
  border: var(--border-width) solid var(--black);
  padding: 1.5rem;
}

.experiment-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.status {
  padding: 0.25rem 0.5rem;
  border: var(--border-width) solid var(--black);
  font-family: var(--mono);
  font-size: 0.75rem;
}

.status.active {
  background: var(--black);
  color: var(--white);
}

.terminal-window {
  border: var(--border-width) solid var(--black);
  background: var(--gray-50);
}

.terminal-header {
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--black);
  background: var(--white);
  font-family: var(--mono);
}

.terminal-content {
  padding: 1rem;
  font-family: var(--mono);
}

.network-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.network-visual {
  display: grid;
  grid-template-columns: repeat(3, minmax(80px, 1fr));
  gap: 1rem;
  align-items: center;
}

.node {
  border: var(--border-width) solid var(--black);
  padding: 0.75rem;
  text-align: center;
}

.connection {
  height: 2px;
  background: var(--black);
  grid-column: 1 / -1;
}

.access-card {
  background: var(--white);
  border: var(--border-width) solid var(--black);
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.access-actions {
  display: flex;
  gap: 1rem;
}
}

/* ===== 投票墙系统 ===== */
.voting-wall {
  background: var(--white);
  border: 2px solid var(--black);
  padding: 2rem;
  margin: 2rem 0;
}

.voting-wall-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.voting-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  margin-bottom: 1rem;
  border: 1px solid var(--gray-300);
  background: var(--gray-50);
  transition: var(--transition);
  cursor: pointer;
}

.voting-item:hover {
  background: var(--white);
  border-color: var(--black);
  transform: translateX(4px);
}

.voting-item.voted {
  background: var(--black);
  color: var(--white);
  border-color: var(--black);
}

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

.voting-item-number {
  font-family: var(--mono);
  font-size: 1.25rem;
  font-weight: 700;
  min-width: 3rem;
}

.voting-item-title {
  font-weight: 500;
  flex: 1;
}

.voting-item-votes {
  font-family: var(--mono);
  font-size: 1.125rem;
  font-weight: 600;
}

.voting-progress-bar {
  width: 100%;
  height: 4px;
  background: var(--gray-200);
  margin-top: 0.5rem;
  overflow: hidden;
}

.voting-progress-fill {
  height: 100%;
  background: var(--black);
  transition: width 0.5s ease;
}

/* ===== Issue面板系统 ===== */
.issue-panel {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.35);
  z-index: 1000;
  display: none;
}

.issue-panel.active {
  display: block;
}

.issue-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--gray-300);
}

.issue-modal {
  width: min(960px, 92%);
  margin: 10vh auto 0;
  background: var(--white);
  border: 2px solid var(--black);
  padding: 1rem 1.25rem;
}

.issue-modal .access-card { margin: 0; }
.issue-modal #hostGrid { grid-template-columns: repeat(2, minmax(320px, 1fr)); }

.issue-header,
.issue-form {
  margin: 0;
  border: 0;
  padding: 0;
  background: transparent;
  width: auto;
}

.issue-modal .issue-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--gray-300);
}

.issue-modal .issue-form {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 0.75rem;
}

.issue-modal .issue-form input,
.issue-modal .issue-form textarea {
  width: 100%;
  border: 2px solid var(--black);
  padding: 0.5rem 0.75rem;
  font-family: var(--mono);
}

.issue-modal .issue-actions {
  grid-column: 1 / -1;
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.issue-panel-title {
  font-size: 1.5rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.issue-create-btn {
  padding: 0.5rem 1rem;
  font-family: var(--mono);
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  border: 2px solid var(--black);
  background: var(--black);
  color: var(--white);
  cursor: pointer;
  transition: var(--transition);
}

.issue-create-btn:hover {
  background: var(--white);
  color: var(--black);
}

.close-issue {
  padding: 0.25rem 0.5rem;
  border: var(--border-width) solid var(--black);
  background: var(--black);
  color: var(--white);
  cursor: pointer;
}

.issue-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.issue-item {
  padding: 1.5rem;
  border: 1px solid var(--gray-300);
  background: var(--gray-50);
  transition: var(--transition);
}

.issue-item:hover {
  background: var(--white);
  border-color: var(--black);
}

.issue-item-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.75rem;
}

.issue-item-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  flex: 1;
}

.issue-item-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--gray-600);
  margin-bottom: 0.75rem;
}

.issue-item-status {
  padding: 0.25rem 0.75rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 0;
}

.issue-status-open {
  background: var(--white);
  color: var(--black);
  border: 1px solid var(--black);
}

.issue-status-closed {
  background: var(--black);
  color: var(--white);
}

.issue-item-description {
  color: var(--gray-700);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.issue-item-actions {
  display: flex;
  gap: 0.5rem;
}

.issue-action-btn {
  padding: 0.5rem 1rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  border: 1px solid var(--gray-300);
  background: var(--white);
  color: var(--black);
  cursor: pointer;
  transition: var(--transition);
}

.issue-action-btn:hover {
  border-color: var(--black);
  background: var(--black);
  color: var(--white);
}

/* ===== 互动元素动画 ===== */
.interactive-element {
  transition: var(--transition);
  cursor: pointer;
}

.interactive-element:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.pulse-animation {
  animation: pulse 2s infinite;
}

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

/* ===== 响应式互动模块 ===== */
@media (max-width: 768px) {
  .danmaku-input {
    bottom: 6rem;
    left: 1rem;
    right: 1rem;
  }
  .barrage-input-container {
    bottom: 1rem;
    right: 1rem;
    left: 1rem;
    flex-direction: column;
    align-items: stretch;
  }
  
  .voting-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
  
  .issue-item-header {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .issue-item-meta {
    flex-direction: column;
    gap: 0.25rem;
  }
}

.contact-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  margin: 1rem 0 1.5rem;
  font-family: var(--mono);
  font-size: 0.9rem;
}

.contact-bar .contact-item i {
  margin-right: 0.5rem;
}

.issue-wall {
  background: var(--white);
  color: var(--black);
  border: var(--border-width) solid var(--black);
  padding: 2rem 0;
}

.issue-wall h2 {
  text-align: center;
  margin-bottom: 1rem;
  letter-spacing: 0.1em;
}

.tab-switch {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.tab-switch .tab-btn {
  padding: 0.5rem 1rem;
  font-family: var(--mono);
  font-size: 0.875rem;
  text-transform: uppercase;
  border: var(--border-width) solid var(--black);
  background: var(--white);
  color: var(--black);
  cursor: pointer;
  transition: var(--transition);
}

.tab-switch .tab-btn.active,
.tab-switch .tab-btn:hover {
  background: var(--black);
  color: var(--white);
}

.tab-content .tab-pane {
  display: none;
}

.tab-content .tab-pane.active {
  display: block;
}

.qr-crypto {
  display: inline-block;
  width: 180px;
  border: var(--border-width) solid var(--black);
  background: var(--white);
  color: var(--black);
  text-align: center;
  padding: 0.75rem;
  margin: 0.5rem;
}

.qr-crypto img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--gray-300);
  background: var(--gray-50);
  margin-bottom: 0.5rem;
}

.qr-crypto .label {
  font-family: var(--mono);
  font-size: 0.875rem;
  text-transform: uppercase;
}
.qr-crypto .desc {
  font-size: 0.8125rem;
  color: var(--gray-700);
  margin-top: 0.25rem;
}
.hosts-section { margin-top: 1.5rem; }
.hosts-intro { color: var(--gray-700); margin: 0.5rem 0 1rem; line-height: 1.6; }
.qr-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.qr-grid.hosts { grid-template-columns: repeat(2, minmax(280px, 1fr)); }
.qr-grid .qr-crypto { width: 100%; }
.qr-grid .qr-crypto img { width: 100%; height: auto; }
.link-card { display: flex; align-items: center; justify-content: center; border: var(--border-width) solid var(--black); background: var(--white); color: var(--black); padding: 0.75rem 1rem; text-decoration: none; font-family: var(--mono); }
.link-card:hover { background: var(--black); color: var(--white); }
.social-section { margin-top: 2rem; }
.subscribe-band { border: var(--border-width) solid var(--black); background: var(--white); padding: 1.5rem; margin: 2rem 0; }
.subscribe-band h3 { margin-top: 0; margin-bottom: 1rem; }
/* Hosts and social layout enhancements */
#hostGrid { display: grid; grid-template-columns: repeat(2, minmax(320px, 1fr)); gap: 1.25rem; align-items: stretch; justify-items: center; }
#socialGrid, #subscribeGrid { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: center; }
.qr-crypto.host { display: flex; align-items: center; width: 100%; max-width: none; text-align: left; padding: 0.75rem 1rem; }
.qr-crypto.host img { width: 140px; height: auto; flex-shrink: 0; }
.qr-crypto.host .qr-content { padding-left: 1rem; }
.qr-crypto.host .label { font-weight: 600; margin-bottom: 0.25rem; }
.qr-crypto.host .desc { line-height: 1.6; }
.link-card.big { min-width: 240px; padding: 1rem 1.25rem; font-weight: 600; }
.link-card.big { min-width: 240px; padding: 1rem 1.25rem; font-weight: 600; }
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero { padding-top: 7rem; }
  .mission-card, .experiment-card, .vote-card, .access-card { margin: 0 0 1rem; }
  .danmaku-container { top: 12vh; height: 28vh; }
  .danmaku-input { bottom: calc(6rem + env(safe-area-inset-bottom)); left: 1rem; right: 1rem; }
  .floating-issue-btn { right: 1rem; bottom: calc(1rem + env(safe-area-inset-bottom)); }
  .tab-switch { flex-wrap: wrap; }
  .tab-switch .tab-btn { flex: 1 1 45%; }
  .qr-grid.hosts { grid-template-columns: 1fr; }
  .qr-crypto.host { flex-direction: column; align-items: flex-start; }
  .qr-crypto.host img { width: 140px; }
}
@media (max-width: 768px) {
  .issue-modal { width: 95%; margin: 8vh auto 0; max-height: 80vh; overflow: auto; }
  .issue-modal .issue-form { grid-template-columns: 1fr; }
}
.subscribe.section { margin-top: 3rem; }
.subscribe #subscribeGrid { margin-top: 1rem; }