/* ===== CSS 变量 ===== */
:root {
  --bg: #000814;
  --primary: #00d4ff;
  --primary-soft: #7fdbff;
  --primary-dim: rgba(0, 212, 255, 0.4);
  --green: #00ff88;
  --orange: #ffaa00;
  --text: #7fdbff;
  --border: rgba(0, 212, 255, 0.4);
  --border-bright: #00d4ff;
  --bg-card: rgba(0, 8, 20, 0.5);
  --bg-card-soft: rgba(0, 212, 255, 0.04);

  --font-display: 'Orbitron', 'SF Mono', monospace;
  --font-mono: 'SF Mono', 'Menlo', 'Monaco', monospace;
  --font-sys: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', sans-serif;
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-display);
  min-height: 100vh;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

/* ===== 主容器 ===== */
.hud-app {
  position: relative;
  z-index: 10;
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
  min-height: 100vh;
}

/* ===== 全局背景层 ===== */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,212,255,0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.08) 1px, transparent 1px);
  background-size: 40px 40px;
  animation: gridMove 20s linear infinite;
  pointer-events: none;
  z-index: 1;
}
body::after {
  content: '';
  position: fixed;
  top: 0; left: 50%;
  width: 800px; height: 400px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse, rgba(0,212,255,0.15) 0%, transparent 70%);
  pointer-events: none;
  animation: pulse 4s ease-in-out infinite;
  z-index: 1;
}
@keyframes gridMove { 100% { transform: translate(40px, 40px); } }
@keyframes pulse { 0%, 100% { opacity: 0.5; } 50% { opacity: 1; } }

/* ===== 状态栏 ===== */
.status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 16px;
  border: 1px solid var(--border);
  background: rgba(0, 212, 255, 0.03);
  font-size: 11px;
  letter-spacing: 2px;
  margin-bottom: 30px;
  backdrop-filter: blur(4px);
}
.status-left, .status-right { display: flex; gap: 20px; }
.status-dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px var(--green);
  margin-right: 6px;
  animation: blink 1.5s ease-in-out infinite;
}
@keyframes blink { 50% { opacity: 0.3; } }

/* ===== 主标题 ===== */
.main-title {
  text-align: center;
  font-size: 36px;
  font-weight: 900;
  letter-spacing: 8px;
  color: var(--primary);
  text-shadow: 0 0 20px rgba(0,212,255,0.4), 0 0 40px rgba(0,212,255,0.2);
  margin: 0 0 8px;
}
.main-subtitle {
  text-align: center;
  font-size: 12px;
  letter-spacing: 4px;
  color: rgba(0, 212, 255, 0.55);
  margin-bottom: 8px;
}

/* ===== 数字计数 ===== */
.counter-row {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin: 20px 0 30px;
  flex-wrap: wrap;
}
.counter {
  text-align: center;
  border: 1px solid rgba(0, 212, 255, 0.2);
  padding: 8px 18px;
  background: var(--bg-card-soft);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  backdrop-filter: blur(4px);
}
.counter-num {
  font-size: 22px;
  font-weight: bold;
  color: var(--green);
  text-shadow: 0 0 10px rgba(0, 255, 136, 0.4);
}
.counter-label {
  font-size: 10px;
  letter-spacing: 2px;
  color: rgba(127, 219, 255, 0.55);
  margin-top: 2px;
}

/* ===== 搜索框 ===== */
.search-bar {
  max-width: 500px;
  margin: 0 auto 24px;
}
.search-input {
  width: 100%;
  background: rgba(0, 8, 20, 0.6);
  border: 1px solid var(--border);
  color: var(--primary);
  padding: 10px 16px;
  font-family: inherit;
  font-size: 13px;
  letter-spacing: 2px;
  outline: none;
  backdrop-filter: blur(4px);
  transition: border-color 0.3s, box-shadow 0.3s;
}
.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.4);
}
.search-input::placeholder { color: rgba(0, 212, 255, 0.35); }

/* ===== Tab ===== */
.tab-bar {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.tab {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 16px;
  font-family: inherit;
  font-size: 12px;
  letter-spacing: 2px;
  transition: all 0.3s;
  position: relative;
}
.tab:hover {
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.3);
}
.tab.active {
  background: rgba(0, 212, 255, 0.15);
  border-color: var(--primary);
  color: var(--primary);
}
.tab.active::after {
  content: '';
  position: absolute;
  bottom: -3px; left: 10%; right: 10%;
  height: 2px;
  background: var(--primary);
  box-shadow: 0 0 8px var(--primary);
}
.tab .count { color: var(--green); font-weight: bold; margin-left: 4px; }

/* ===== 页脚 ===== */
.site-footer {
  margin-top: 60px;
  padding: 20px 0;
  text-align: center;
  font-size: 11px;
  color: rgba(127, 219, 255, 0.4);
  letter-spacing: 1px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-top: 1px solid rgba(0, 212, 255, 0.1);
}

/* ===== 全视口固定动效层 ===== */
.mouse-glow {
  position: fixed;
  pointer-events: none;
  width: 600px; height: 600px;
  margin-left: -300px;
  margin-top: -300px;
  background: radial-gradient(circle, rgba(0,212,255,0.2) 0%, rgba(0,212,255,0.06) 30%, transparent 60%);
  z-index: 2;
  mix-blend-mode: screen;
  left: 0; top: 0;
}
.particle-canvas {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 3;
}
.data-stream {
  position: fixed;
  pointer-events: none;
  z-index: 4;
  background: linear-gradient(90deg, transparent, rgba(0,212,255,0.6), transparent);
  height: 1px;
  width: 200px;
}
.data-stream.s1 { top: 15%; animation: streamFlow1 8s linear infinite; }
.data-stream.s2 { top: 70%; animation: streamFlow2 11s linear infinite; }
.data-stream.s3 { top: 40%; animation: streamFlow3 9s linear infinite; }
@keyframes streamFlow1 {
  0% { left: -200px; opacity: 0; }
  10% { opacity: 1; } 90% { opacity: 1; }
  100% { left: 100%; opacity: 0; }
}
@keyframes streamFlow2 {
  0% { left: 100%; opacity: 0; }
  10% { opacity: 1; } 90% { opacity: 1; }
  100% { left: -200px; opacity: 0; }
}
@keyframes streamFlow3 {
  0% { left: -200px; opacity: 0; }
  15% { opacity: 1; } 85% { opacity: 1; }
  100% { left: 100%; opacity: 0; }
}

.hide-mobile { display: inline; }
@media (max-width: 640px) {
  .hide-mobile { display: none; }
  .main-title { font-size: 26px; letter-spacing: 4px; }
  .counter-row { gap: 12px; }
  .counter { padding: 6px 12px; }
  .counter-num { font-size: 18px; }
}

/* ===== 卡片网格 ===== */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  perspective: 1200px;
  margin-bottom: 40px;
}
@media (max-width: 480px) {
  .ai-grid { grid-template-columns: 1fr; }
}

/* ===== 卡片 ===== */
.ai-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 18px;
  position: relative;
  cursor: pointer;
  transition: box-shadow 0.4s ease, border-color 0.4s ease;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  transform-style: preserve-3d;
  overflow: hidden;
  backdrop-filter: blur(6px);
  will-change: transform;
  animation: cardIn 0.6s ease-out backwards;
}
.ai-card:nth-child(1) { animation-delay: 0.05s; }
.ai-card:nth-child(2) { animation-delay: 0.10s; }
.ai-card:nth-child(3) { animation-delay: 0.15s; }
.ai-card:nth-child(4) { animation-delay: 0.20s; }
.ai-card:nth-child(5) { animation-delay: 0.25s; }
.ai-card:nth-child(6) { animation-delay: 0.30s; }
.ai-card:nth-child(7) { animation-delay: 0.35s; }
.ai-card:nth-child(8) { animation-delay: 0.40s; }
.ai-card:nth-child(n+9) { animation-delay: 0.45s; }
@keyframes cardIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 边框跑光 - hover 时启动 */
.ai-card::before {
  content: '';
  position: absolute;
  inset: -2px;
  background: conic-gradient(from 0deg, transparent 70%, var(--primary), transparent);
  opacity: 0;
  transition: opacity 0.5s ease;
  z-index: -1;
}
.ai-card:hover::before {
  opacity: 0.8;
  animation: rotateBorder 4s linear infinite;
}
@keyframes rotateBorder { to { transform: rotate(360deg); } }

/* 扫描线 */
.ai-card::after {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(0,212,255,0.3), transparent);
  transition: left 0.8s ease;
  pointer-events: none;
}
.ai-card:hover::after { left: 100%; }

.ai-card:hover {
  box-shadow: 0 0 40px rgba(0,212,255,0.4), inset 0 0 20px rgba(0,212,255,0.08);
  border-color: var(--border-bright);
}

/* 角落装饰 */
.ai-card .corner { position: absolute; width: 12px; height: 12px; border-color: var(--primary); pointer-events: none; }
.ai-card .c-tl { top: 4px; left: 4px; border-top: 1px solid; border-left: 1px solid; }
.ai-card .c-br { bottom: 4px; right: 4px; border-bottom: 1px solid; border-right: 1px solid; }

/* 卡片内部 */
.card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.card-title { font-size: 18px; font-weight: bold; color: var(--primary); letter-spacing: 2px; text-transform: uppercase; }
.card-status { font-size: 9px; letter-spacing: 1px; color: var(--green); display: flex; align-items: center; }
.card-desc {
  font-size: 12px;
  color: var(--text);
  line-height: 1.6;
  margin-bottom: 14px;
  letter-spacing: 0.3px;
  font-family: var(--font-mono);
  min-height: 38px;
}
.card-meta { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.card-meta span {
  border: 1px solid rgba(0,212,255,0.3);
  padding: 2px 8px;
  font-size: 10px;
  letter-spacing: 1px;
  background: rgba(0, 212, 255, 0.05);
}
.card-meta span.free { color: var(--green); border-color: rgba(0, 255, 136, 0.4); }
.card-meta span.free-tier { color: #ffd700; border-color: rgba(255, 215, 0, 0.4); }
.card-meta span.open-source { color: #c084fc; border-color: rgba(192, 132, 252, 0.4); }
.card-meta span.cn { color: var(--orange); border-color: rgba(255, 170, 0, 0.4); }

.card-link {
  display: inline-block;
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--primary);
  border: 1px solid var(--primary);
  padding: 6px 14px;
  transition: all 0.2s;
}
.card-link:hover { background: var(--primary); color: var(--bg); }

/* 卡片右上角对比按钮 */
.compare-toggle {
  position: absolute;
  top: 8px; right: 8px;
  width: 26px; height: 26px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid var(--primary);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.3s, background 0.2s;
  z-index: 5;
}
.ai-card:hover .compare-toggle { opacity: 1; }
.compare-toggle:hover { background: rgba(0, 212, 255, 0.3); }
.compare-toggle.selected {
  opacity: 1;
  background: var(--primary);
  color: var(--bg);
}

/* ===== 底部对比栏 ===== */
.compare-bar {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: rgba(0, 8, 20, 0.85);
  border: 1px solid var(--primary);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  z-index: 50;
  backdrop-filter: blur(12px);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.3);
  clip-path: polygon(12px 0, calc(100% - 12px) 0, 100% 12px, 100% calc(100% - 12px), calc(100% - 12px) 100%, 12px 100%, 0 calc(100% - 12px), 0 12px);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.3s ease, opacity 0.3s ease;
  font-size: 12px;
  letter-spacing: 2px;
}
.compare-bar.visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
  pointer-events: auto;
}
.compare-text { color: var(--text); }
.compare-text b { color: var(--green); font-size: 16px; }
.compare-btn {
  background: var(--primary);
  border: none;
  color: var(--bg);
  padding: 8px 18px;
  font-family: inherit;
  font-size: 12px;
  letter-spacing: 2px;
  font-weight: bold;
  transition: all 0.2s;
}
.compare-btn:hover {
  box-shadow: 0 0 20px var(--primary);
  transform: translateY(-2px);
}
.compare-btn.compare-clear {
  background: transparent;
  border: 1px solid var(--orange);
  color: var(--orange);
}
.compare-btn.compare-clear:hover {
  background: var(--orange);
  color: var(--bg);
  box-shadow: 0 0 20px var(--orange);
}

/* ===== 对比浮层 ===== */
.compare-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.compare-modal.visible { display: flex; animation: modalFade 0.3s ease; }
@keyframes modalFade { from { opacity: 0; } to { opacity: 1; } }

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 8, 20, 0.85);
  backdrop-filter: blur(8px);
}
.modal-content {
  position: relative;
  background: var(--bg);
  border: 1px solid var(--primary);
  padding: 24px;
  max-width: 1100px;
  width: 100%;
  max-height: 85vh;
  overflow: auto;
  box-shadow: 0 0 50px rgba(0, 212, 255, 0.5);
  clip-path: polygon(20px 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%, 0 20px);
}
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
  padding-bottom: 16px;
  margin-bottom: 20px;
}
.modal-header h2 {
  color: var(--primary);
  font-size: 20px;
  letter-spacing: 4px;
  margin: 0;
  text-shadow: 0 0 10px rgba(0, 212, 255, 0.4);
}
.modal-close {
  background: transparent;
  border: 1px solid var(--orange);
  color: var(--orange);
  padding: 6px 14px;
  font-family: inherit;
  font-size: 12px;
  letter-spacing: 2px;
  transition: all 0.2s;
}
.modal-close:hover {
  background: var(--orange);
  color: var(--bg);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
}
.compare-table th, .compare-table td {
  border: 1px solid rgba(0, 212, 255, 0.15);
  padding: 12px 16px;
  text-align: left;
  vertical-align: top;
}
.compare-table thead th {
  background: rgba(0, 212, 255, 0.08);
  color: var(--primary);
  font-family: var(--font-display);
  letter-spacing: 2px;
  font-size: 13px;
}
.compare-table .row-label {
  color: var(--orange);
  font-weight: bold;
  width: 80px;
  letter-spacing: 1px;
}
.compare-table a {
  color: var(--primary);
  text-decoration: underline;
}
.compare-table a:hover { color: var(--green); }

@media (max-width: 720px) {
  .modal-content { padding: 16px; }
  .compare-table { font-size: 11px; }
  .compare-table th, .compare-table td { padding: 8px; }
  .compare-bar { font-size: 11px; padding: 10px 14px; gap: 10px; flex-wrap: wrap; }
  .compare-btn { padding: 6px 12px; }
}