* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
}
html { scroll-behavior: smooth; }

body {
  background: #02040a;
  color: #eef6ff;
  overflow-x: hidden;
  transition: background 0.4s ease, color 0.4s ease;
}

/* ===== 星空背景 ===== */
#stars {
  position: fixed; top: 0; left: 0;
  width: 100vw; height: 100vh;
  z-index: -3;
}
#glow {
  position: fixed; top: 0; left: 0;
  width: 100vw; height: 100vh;
  background: radial-gradient(circle at 50% 30%, rgba(30,60,120,0.35), transparent 65%);
  z-index: -2;
}

/* ===== 顶栏 ===== */
.header {
  position: sticky; top: 0; z-index: 999;
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 14px 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: 0.3s ease;
  flex-wrap: wrap;
  gap: 8px;
}
.logo {
  font-size: 22px; font-weight: 700;
  background: linear-gradient(90deg, #9ae3ff, #60a5fa);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  white-space: nowrap;
}
.nav {
  display: flex; gap: 4px; flex-wrap: wrap;
}
.nav a {
  color: #ccc;
  padding: 5px 12px;
  text-decoration: none;
  font-size: 13px;
  border-radius: 8px;
  transition: all 0.25s ease;
  position: relative;
}
.nav a::after {
  content: '';
  position: absolute;
  bottom: 2px; left: 12px; right: 12px;
  height: 2px;
  background: #60a5fa;
  transform: scaleX(0);
  transition: transform 0.25s ease;
  border-radius: 2px;
}
.nav a:hover {
  color: #fff;
  background: rgba(255,255,255,0.06);
}
.nav a:hover::after {
  transform: scaleX(1);
}
.toggle {
  background: rgba(255,255,255,0.08);
  color: #ddd;
  border: 1px solid rgba(255,255,255,0.12);
  padding: 7px 14px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 13px;
  transition: all 0.2s;
  white-space: nowrap;
}
.toggle:hover {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.25);
}

/* ===== Banner ===== */
.banner {
  padding: 60px 20px 30px;
  text-align: center;
}
.banner h1 {
  font-size: clamp(26px, 5vw, 44px);
  margin-bottom: 12px;
  background: linear-gradient(135deg, #00c6ff, #0072ff, #9ae3ff);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: gradientShift 4s ease infinite;
}
@keyframes gradientShift {
  0%,100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}
.banner p {
  color: #999;
  font-size: clamp(13px, 2vw, 16px);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ===== 搜索框 ===== */
#searchInput {
  width: 100%; max-width: 600px;
  padding: 16px 24px;
  border-radius: 30px;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(0,0,0,0.35);
  color: #fff;
  font-size: 16px;
  outline: none;
  backdrop-filter: blur(8px);
  transition: all 0.3s;
  display: block;
  margin: 0 auto 10px;
}
#searchInput:focus {
  border-color: #60a5fa;
  box-shadow: 0 0 30px rgba(96,165,250,0.15);
}
#searchInput::placeholder {
  color: #666;
}

/* ===== 模块 ===== */
.module {
  max-width: 1400px;
  margin: 32px auto;
  padding: 0 16px;
}
.module h2 {
  font-size: clamp(16px, 2.5vw, 24px);
  color: #9ae3ff;
  margin-bottom: 18px;
  padding: 10px 16px;
  background: rgba(255,255,255,0.03);
  border-radius: 12px;
  border-left: 4px solid #9ae3ff;
}

/* ===== 卡片网格 ===== */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 18px;
  transition: 0.4s ease;
}
.tool-card {
  background: linear-gradient(135deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  padding: 20px;
  backdrop-filter: blur(8px);
  transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
  position: relative;
  overflow: hidden;
}
.tool-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: linear-gradient(135deg, rgba(96,165,250,0.05), transparent);
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
}
.tool-card:hover {
  transform: translateY(-6px);
  border-color: rgba(96,165,250,0.25);
  box-shadow: 0 12px 40px rgba(96,165,250,0.12);
}
.tool-card:hover::before {
  opacity: 1;
}
.tool-card h3 {
  color: #9ae3ff;
  margin-bottom: 6px;
  font-size: 16px;
  font-weight: 600;
}
.tool-card p {
  color: #888;
  font-size: 13px;
  margin-bottom: 12px;
  line-height: 1.5;
}
.tool-card button {
  background: linear-gradient(135deg, #3b82f6, #60a5fa);
  color: #fff;
  border: none;
  padding: 7px 14px;
  border-radius: 10px;
  margin-right: 6px;
  margin-bottom: 6px;
  cursor: pointer;
  font-weight: 500;
  font-size: 13px;
  transition: all 0.2s;
}
.tool-card button:hover {
  filter: brightness(1.15);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(59,130,246,0.3);
}
.copy-btn {
  background: rgba(255,255,255,0.08) !important;
  color: #aaa !important;
  border: 1px solid rgba(255,255,255,0.12) !important;
  font-size: 12px !important;
}
.copy-btn:hover {
  background: rgba(255,255,255,0.15) !important;
  color: #fff !important;
}

/* ===== 内容区 ===== */
.tool-content {
  margin-top: 10px;
  padding: 14px 16px;
  border-radius: 12px;
  background: rgba(0,0,0,0.3);
  font-size: 13px;
  line-height: 1.9;
  color: #ddd;
  display: none;
  max-height: 320px;
  overflow-y: auto;
  border: 1px solid rgba(255,255,255,0.04);
}
.tool-content::-webkit-scrollbar { width: 4px; }
.tool-content::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.1);
  border-radius: 4px;
}

/* ===== 页脚 ===== */
.footer {
  text-align: center;
  padding: 40px 20px;
  color: #666;
  background: rgba(0,0,0,0.35);
  margin-top: 50px;
  font-size: 13px;
  border-top: 1px solid rgba(255,255,255,0.04);
}
.footer p { margin: 4px 0; }

/* ===== 浅色模式 ===== */
body.light { background: #f0f5ff; color: #1a1a2e; }
.light .header { background: rgba(255,255,255,0.75); border-bottom: 1px solid rgba(0,0,0,0.06); }
.light .logo { background: linear-gradient(90deg, #2563eb, #3b82f6); -webkit-background-clip: text; background-clip: text; }
.light .nav a { color: #444; }
.light .nav a:hover { color: #2563eb; background: rgba(37,99,235,0.08); }
.light .banner p { color: #666; }
.light .banner h1 { background: linear-gradient(135deg, #2563eb, #3b82f6, #60a5fa); background-size: 200% 200%; -webkit-background-clip: text; background-clip: text; }
.light .tool-card { background: rgba(255,255,255,0.7); border-color: rgba(0,0,0,0.08); }
.light .tool-card::before { background: linear-gradient(135deg, rgba(37,99,235,0.04), transparent); }
.light .tool-card:hover { border-color: rgba(37,99,235,0.2); box-shadow: 0 12px 40px rgba(37,99,235,0.1); }
.light .tool-card h3 { color: #2563eb; }
.light .tool-card p { color: #666; }
.light .tool-content { background: rgba(0,0,0,0.04); color: #333; border-color: rgba(0,0,0,0.06); }
.light .module h2 { color: #2563eb; border-left-color: #2563eb; background: rgba(37,99,235,0.04); }
.light .toggle { background: rgba(0,0,0,0.05); color: #333; border-color: rgba(0,0,0,0.1); }
.light .toggle:hover { background: rgba(0,0,0,0.1); }
.light .copy-btn { background: rgba(0,0,0,0.06) !important; color: #666 !important; border-color: rgba(0,0,0,0.1) !important; }
.light .copy-btn:hover { background: rgba(0,0,0,0.12) !important; color: #111 !important; }
.light .footer { color: #999; border-top-color: rgba(0,0,0,0.06); }
.light #searchInput { background: rgba(255,255,255,0.8); color: #111; border-color: rgba(0,0,0,0.1); }
.light #searchInput:focus { border-color: #3b82f6; box-shadow: 0 0 30px rgba(59,130,246,0.1); }

/* ===== 移动端适配 ===== */
@media (max-width: 768px) {
  .header { padding: 10px 12px; }
  .logo { font-size: 16px; }
  .nav { gap: 2px; order: 3; width: 100%; justify-content: center; }
  .nav a { font-size: 11px; padding: 4px 7px; }
  .tool-grid { grid-template-columns: 1fr; gap: 12px; }
  .tool-card { padding: 16px; }
  .banner { padding: 30px 12px 20px; }
  .module { margin: 20px auto; padding: 0 10px; }
  .module h2 { font-size: 15px; padding: 8px 12px; }
  #searchInput { padding: 14px 18px; font-size: 14px; }
}