/* ============================================
   gameblast.pro — 信号塔
   全球信号监测中心 × 雷达灵感设计 × 白色极简 × 细线网格
   ============================================ */

/* ===== Reset ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

/* ===== CSS Variables ===== */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #fafafa;
  --bg-tertiary: #f5f5f5;
  --grid-line: rgba(0, 0, 0, 0.06);
  --grid-line-strong: rgba(0, 0, 0, 0.12);
  --text-primary: #0a0a0a;
  --text-secondary: #4a4a4a;
  --text-muted: #8a8a8a;
  --text-light: #c8c8c8;
  --signal-breaking: #dc2626;
  --signal-trending: #2563eb;
  --signal-weak: #9ca3af;
  --signal-future: #7c3aed;
  --accent: #0a0a0a;
  --accent-hover: #2563eb;
  --max-width: 1440px;
  --nav-height: 64px;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Consolas', monospace;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ===== Body — 白色极简背景 ===== */
body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
}

/* 背景网格线 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* ===== Navigation — 信号塔导航 ===== */
.st-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--grid-line-strong);
}

.st-nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  padding: 0 48px;
  gap: 40px;
}

.st-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}

.st-logo-icon {
  width: 32px;
  height: 32px;
  position: relative;
}

/* 雷达图标 */
.st-logo-icon::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 28px;
  height: 28px;
  border: 1.5px solid var(--text-primary);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.st-logo-icon::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 14px;
  height: 14px;
  border: 1px solid var(--text-primary);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.st-logo-text {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.5px;
  color: var(--text-primary);
  text-transform: uppercase;
}

.st-nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
  margin-left: auto;
}

.st-nav-links a {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 8px 0;
  position: relative;
  transition: color 0.2s;
}

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

.st-nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--text-primary);
  transition: width 0.3s;
}

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

.st-nav-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.st-signal-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--grid-line-strong);
  border-radius: 2px;
}

.st-signal-dot {
  width: 6px;
  height: 6px;
  background: #22c55e;
  border-radius: 50%;
  animation: signal-pulse 2s infinite;
}

@keyframes signal-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.st-signal-text {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  text-transform: uppercase;
}

.st-mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.st-mobile-menu-btn span {
  width: 20px;
  height: 1px;
  background: var(--text-primary);
  transition: all 0.3s;
}

/* ===== Header — 全球信号中心 ===== */
.st-header {
  position: relative;
  padding: 140px 48px 80px;
  text-align: center;
  z-index: 1;
}

.st-header::before {
  content: '';
  position: absolute;
  top: var(--nav-height);
  left: 50%;
  transform: translateX(-50%);
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, transparent, var(--grid-line-strong));
}

.st-header-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.st-header-label::before,
.st-header-label::after {
  content: '';
  width: 40px;
  height: 1px;
  background: var(--grid-line-strong);
}

.st-header-title {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 8px;
  text-transform: uppercase;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.st-header-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 16px;
}

.st-header-divider-line {
  width: 120px;
  height: 1px;
  background: var(--text-primary);
}

.st-header-divider-blocks {
  display: flex;
  gap: 4px;
}

.st-header-divider-block {
  width: 8px;
  height: 8px;
  background: var(--text-primary);
}

.st-header-subtitle {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 2px;
  color: var(--text-secondary);
}

/* 雷达扫描动画背景 */
.st-radar-bg {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  opacity: 0.03;
  pointer-events: none;
}

.st-radar-circle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border: 1px solid var(--text-primary);
  border-radius: 50%;
}

.st-radar-circle:nth-child(1) { width: 150px; height: 150px; }
.st-radar-circle:nth-child(2) { width: 300px; height: 300px; }
.st-radar-circle:nth-child(3) { width: 450px; height: 450px; }
.st-radar-circle:nth-child(4) { width: 600px; height: 600px; }

.st-radar-sweep {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 300px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--text-primary));
  transform-origin: left center;
  animation: radar-sweep 8s linear infinite;
}

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

/* ===== Section — 信号区域 ===== */
.st-section {
  position: relative;
  padding: 60px 48px;
  z-index: 1;
}

.st-section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.st-section-header {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 48px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--grid-line-strong);
}

.st-section-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
  white-space: nowrap;
}

.st-section-title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--text-primary);
}

.st-section-line {
  flex: 1;
  height: 1px;
  background: var(--grid-line-strong);
}

/* Breaking Signals */
.st-breaking .st-section-title { color: var(--signal-breaking); }
.st-breaking .st-section-label { color: var(--signal-breaking); opacity: 0.6; }

/* Trending Signals */
.st-trending .st-section-title { color: var(--signal-trending); }
.st-trending .st-section-label { color: var(--signal-trending); opacity: 0.6; }

/* Weak Signals */
.st-weak .st-section-title { color: var(--signal-weak); }
.st-weak .st-section-label { color: var(--signal-weak); opacity: 0.6; }

/* Future Signals */
.st-future .st-section-title { color: var(--signal-future); }
.st-future .st-section-label { color: var(--signal-future); opacity: 0.6; }

/* ===== Signal Cards ===== */
.st-signals-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--grid-line-strong);
}

.st-signal-card {
  background: var(--bg-primary);
  padding: 32px;
  position: relative;
  transition: all 0.3s;
  text-decoration: none;
  display: block;
}

.st-signal-card:hover {
  background: var(--bg-secondary);
}

.st-signal-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--text-primary);
  transition: width 0.3s;
}

.st-signal-card:hover::before {
  width: 100%;
}

/* Breaking card accent */
.st-breaking .st-signal-card:hover::before { background: var(--signal-breaking); }

/* Trending card accent */
.st-trending .st-signal-card:hover::before { background: var(--signal-trending); }

/* Weak card accent */
.st-weak .st-signal-card:hover::before { background: var(--signal-weak); }

/* Future card accent */
.st-future .st-signal-card:hover::before { background: var(--signal-future); }

/* Large card */
.st-signal-card.st-signal-lg {
  grid-column: span 2;
  grid-row: span 2;
  padding: 48px;
}

.st-signal-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.st-signal-category {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 4px 8px;
  border: 1px solid var(--grid-line-strong);
}

.st-signal-time {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-light);
}

.st-signal-title {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.st-signal-lg .st-signal-title {
  font-size: 24px;
  line-height: 1.3;
}

.st-signal-excerpt {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.st-signal-lg .st-signal-excerpt {
  -webkit-line-clamp: 4;
  font-size: 14px;
}

/* Signal wave indicator */
.st-signal-wave {
  position: absolute;
  bottom: 32px;
  right: 32px;
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 16px;
}

.st-signal-wave span {
  width: 2px;
  background: var(--text-light);
  animation: wave 1s ease-in-out infinite;
}

.st-signal-wave span:nth-child(1) { height: 4px; animation-delay: 0s; }
.st-signal-wave span:nth-child(2) { height: 8px; animation-delay: 0.1s; }
.st-signal-wave span:nth-child(3) { height: 12px; animation-delay: 0.2s; }
.st-signal-wave span:nth-child(4) { height: 8px; animation-delay: 0.3s; }
.st-signal-wave span:nth-child(5) { height: 4px; animation-delay: 0.4s; }

@keyframes wave {
  0%, 100% { transform: scaleY(1); }
  50% { transform: scaleY(1.5); }
}

/* ===== Data Stream Section ===== */
.st-data-stream {
  padding: 80px 48px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--grid-line-strong);
  border-bottom: 1px solid var(--grid-line-strong);
}

.st-data-stream-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.st-data-stream-header {
  text-align: center;
  margin-bottom: 48px;
}

.st-data-stream-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.st-data-stream-subtitle {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--text-light);
}

.st-data-stream-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1px;
  background: var(--grid-line-strong);
}

.st-data-item {
  background: var(--bg-primary);
  padding: 24px;
  text-align: center;
  transition: all 0.3s;
}

.st-data-item:hover {
  background: var(--bg-tertiary);
}

.st-data-value {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.st-data-label {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* ===== Footer ===== */
.st-footer {
  padding: 60px 48px 40px;
  border-top: 1px solid var(--grid-line-strong);
  z-index: 1;
  position: relative;
}

.st-footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.st-footer-left {
  display: flex;
  align-items: center;
  gap: 24px;
}

.st-footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.st-footer-logo-icon {
  width: 20px;
  height: 20px;
  border: 1px solid var(--text-muted);
  border-radius: 50%;
  position: relative;
}

.st-footer-logo-icon::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 8px;
  height: 8px;
  border: 1px solid var(--text-muted);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.st-footer-logo-text {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--text-muted);
}

.st-footer-links {
  display: flex;
  gap: 24px;
}

.st-footer-links a {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

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

.st-footer-right {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

/* ===== Search Overlay ===== */
.st-search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.98);
  z-index: 200;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 120px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
}

.st-search-overlay.active {
  opacity: 1;
  visibility: visible;
}

.st-search-box {
  width: 100%;
  max-width: 600px;
  padding: 0 24px;
}

.st-search-input-wrapper {
  position: relative;
  border-bottom: 2px solid var(--text-primary);
}

.st-search-input {
  width: 100%;
  padding: 20px 40px 20px 0;
  font-family: var(--font-mono);
  font-size: 24px;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
}

.st-search-input::placeholder {
  color: var(--text-light);
}

.st-search-close {
  position: absolute;
  top: 20px;
  right: 0;
  background: none;
  border: none;
  font-size: 32px;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
}

.st-search-results {
  margin-top: 32px;
  max-height: 400px;
  overflow-y: auto;
}

.st-search-result {
  display: block;
  padding: 16px 0;
  border-bottom: 1px solid var(--grid-line-strong);
  text-decoration: none;
  transition: all 0.2s;
}

.st-search-result:hover {
  padding-left: 16px;
}

.st-search-result-title {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.st-search-result-category {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* ===== Animations ===== */
.st-reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Signal pulse animation */
@keyframes signal-blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.st-breaking .st-signal-category {
  animation: signal-blink 2s infinite;
}

/* ===== Responsive ===== */
@media (max-width: 1200px) {
  .st-signals-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .st-signal-card.st-signal-lg {
    grid-column: span 2;
  }
  
  .st-data-stream-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 900px) {
  .st-nav-links {
    display: none;
  }
  
  .st-mobile-menu-btn {
    display: flex;
  }
  
  .st-signals-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .st-signal-card.st-signal-lg {
    grid-column: span 2;
    grid-row: span 1;
  }
  
  .st-header {
    padding: 120px 24px 60px;
  }
  
  .st-section {
    padding: 48px 24px;
  }
  
  .st-data-stream-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .st-footer-inner {
    flex-direction: column;
    gap: 24px;
    text-align: center;
  }
  
  .st-footer-left {
    flex-direction: column;
    gap: 16px;
  }
}

@media (max-width: 600px) {
  .st-nav-inner {
    padding: 0 20px;
  }
  
  .st-signals-grid {
    grid-template-columns: 1fr;
  }
  
  .st-signal-card.st-signal-lg {
    grid-column: span 1;
  }
  
  .st-signal-lg .st-signal-title {
    font-size: 20px;
  }
  
  .st-header-title {
    font-size: 12px;
    letter-spacing: 4px;
  }
  
  .st-section-header {
    flex-wrap: wrap;
  }
  
  .st-data-stream-grid {
    grid-template-columns: 1fr;
  }
  
  .st-data-value {
    font-size: 24px;
  }
}

/* ===== Print Styles ===== */
@media print {
  .st-nav,
  .st-search-overlay,
  .st-radar-bg,
  .st-signal-wave {
    display: none;
  }
  
  body::before {
    display: none;
  }
  
  .st-reveal {
    opacity: 1;
    transform: none;
  }
}