/* 全局重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #4e6ef2;
  --primary-hover: #3b5bdb;
  --bg: #ffffff;
  --text: #1f1f1f;
  --text-secondary: #666;
  --border: #e0e0e0;
  --shadow: rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1a1a;
    --text: #f0f0f0;
    --text-secondary: #aaa;
    --border: #333;
    --shadow: rgba(0, 0, 0, 0.4);
  }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  transition: background 0.3s ease, color 0.3s ease;
}

.container {
  width: 100%;
  max-width: 640px;
  text-align: center;
}

/* 头部 */
.header {
  margin-bottom: 40px;
}

.logo {
  font-size: 48px;
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.logo-baidu {
  color: var(--primary);
}

.logo-search {
  color: var(--text);
}

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

/* 搜索框 */
.search-box {
  margin-bottom: 30px;
}

.input-wrapper {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.search-input {
  flex: 1;
  padding: 14px 20px;
  font-size: 16px;
  border: 2px solid var(--border);
  border-radius: 12px;
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(78, 110, 242, 0.15);
}

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

.search-btn {
  padding: 14px 28px;
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  background: var(--primary);
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.1s ease;
  white-space: nowrap;
}

.search-btn:hover {
  background: var(--primary-hover);
}

.search-btn:active {
  transform: scale(0.97);
}

/* 热门搜索 */
.hot-words {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 13px;
}

.hot-label {
  color: var(--text-secondary);
}

.hot-tag {
  padding: 6px 14px;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 20px;
  cursor: pointer;
  font-size: 13px;
  transition: all 0.2s ease;
}

.hot-tag:hover {
  color: var(--primary);
  border-color: var(--primary);
  background: rgba(78, 110, 242, 0.06);
}

/* 底部 */
.footer {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 12px;
}

/* 响应式 */
@media (max-width: 480px) {
  .logo {
    font-size: 36px;
  }

  .input-wrapper {
    flex-direction: column;
  }

  .search-btn {
    width: 100%;
  }
}