:root {
  --input-bg: #181f2a;
  --input-border: #2d3950;
  --input-color: #e6eaf3;
  --desc-bg: #232b39;
  --desc-color: #e6eaf3;
  background: var(--bg-main) !important;
}
body.light-theme {
  --input-bg: #fff;
  --input-border: #ccc;
  --input-color: #222;
  --desc-bg: #f6f8fa;
  --desc-color: #222;
}

body {
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: #181f2a;
  color: #e6eaf3;
}

body.dark-theme {
  background: #181f2a;
  color: #e6eaf3;
}
body.light-theme {
  background: #fff;
  color: #222;
}
.dark-theme .navbar, .dark-theme .card, .dark-theme .dropdown-menu {
  background: #232b39 !important;
  color: #e6eaf3 !important;
}
.light-theme .navbar, .light-theme .card, .light-theme .dropdown-menu {
  background: #fff !important;
  color: #222 !important;
}
.dark-theme .main-content, .dark-theme .footer {
  background: #181f2a;
  color: #e6eaf3;
}
.light-theme .main-content, .light-theme .footer {
  background: var(--bg-card);
  color: var(--text-main);
}
.dark-theme .btn, .dark-theme .form-control {
  background: #232b39;
  color: #e6eaf3;
  border-color: #2d3950;
}
.light-theme .btn, .light-theme .form-control {
  background: #fff;
  color: #222;
  border-color: #ccc;
}

.navbar {
  width: 100%;
  background: #232b39;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem 0 1.5rem;
  height: 60px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.12);
  box-sizing: border-box;
}

.navbar-logo {
  font-size: 1.3rem;
  font-weight: bold;
  letter-spacing: 1px;
}

.navbar-menu {
  list-style: none;
  display: flex;
  gap: 2rem;
  margin: 0;
  padding: 0;
}

.navbar-menu li a {
  color: #e6eaf3;
  text-decoration: none;
  font-size: 1rem;
  padding: 8px 16px;
  border-radius: 6px;
  transition: background 0.2s;
}

.navbar-menu li a:hover {
  background: #2d3950;
}

.main-content {
  max-width: 1928px;
  margin: 2rem auto 0 auto;
  padding: 0 1rem 2rem 1rem;
  box-sizing: border-box;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.card {
  background: #232b39;
  border-radius: 14px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.18);
  padding: 2rem 1.5rem 1.5rem 1.5rem;
  color: #e6eaf3;
  transition: transform 0.2s, box-shadow 0.2s;
  position: relative;
}

.card-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.card-desc {
  font-size: 0.98rem;
  color: #b6bed1;
  margin-bottom: 1.2rem;
}

.card-link {
  color: #6cb6ff;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.card-link:hover {
  color: #fff;
}

.btn {
  background: #2979ff;
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0.4rem 1.2rem;
  font-size: 1rem;
  font-weight: 400;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 8px rgba(58,139,253,0.08);
}

.btn:hover {
  background: #1565c0;
}

.footer {
  background: var(--bg-main) !important;
  color: var(--text-desc);
  text-align: center;
  padding: 2rem 0 1rem 0;
  font-size: 0.98rem;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.dark-theme .footer {
  background: var(--bg-main) !important;
  color: var(--text-desc) !important;
}
.light-theme .footer {
  background: var(--bg-main) !important;
  color: var(--text-desc) !important;
}

.tool-page-flex {
  display: flex;
  align-items: flex-start;
  min-height: 520px;
}

.dark-theme .dropdown-menu {
    background: #232b39 !important;
    color: #e6eaf3 !important;
}
.dark-theme .dropdown-item {
    color: #e6eaf3 !important;
}
.dark-theme .dropdown-item.active,
.dark-theme .dropdown-item:active,
.dark-theme .dropdown-item:hover {
    background: #395b8c !important;
    color: #fff !important;
}
.light-theme .dropdown-menu {
    background: #fff !important;
    color: #222 !important;
}
.light-theme .dropdown-item {
    color: #222 !important;
}
.light-theme .dropdown-item.active,
.light-theme .dropdown-item:active,
.light-theme .dropdown-item:hover {
    background: #e6eaf3 !important;
    color: #232b39 !important;
}
/* 鼠标悬停主菜单显示下拉 */
.navbar-nav .dropdown:hover .dropdown-menu {
    display: block;
    margin-top: 0;
}

/* 代码块样式优化 */
.dark-theme pre, .dark-theme code {
  background: #232b39;
  color: #e6eaf3;
  border-radius: 6px;
  border: 1px solid #2d3950;
  padding: 0.8em 1em;
  font-size: 1em;
  font-family: 'Fira Mono', 'Consolas', 'Menlo', 'Monaco', monospace;
}
.light-theme pre, .light-theme code {
  background: #f0f2f5;
  color: #222;
  border-radius: 6px;
  border: 1px solid #d0d5da;
  padding: 0.8em 1em;
  font-size: 1em;
  font-family: 'Fira Mono', 'Consolas', 'Menlo', 'Monaco', monospace;
}

/* 保证简介区块内代码块有 margin */
pre, code {
  margin-top: 0.5em;
  margin-bottom: 0.5em;
  display: block;
  overflow-x: auto;
}

.form-control {
  background: var(--input-bg) !important;
  color: var(--input-color) !important;
  border: 1px solid var(--input-border) !important;
  border-radius: 8px;
  font-size: 1rem;
  box-sizing: border-box;
  transition: background 0.2s, color 0.2s, border 0.2s;
}

.form-control:focus {
  border-color: #2979ff !important;
  box-shadow: 0 0 0 2px rgba(41,121,255,0.12);
}

.tool-desc-block {
  background: var(--desc-bg);
  color: var(--desc-color);
  border-radius: 12px;
  padding: 1.5rem 1.5rem 1.2rem 1.5rem;
  font-size: 0.95rem;
  line-height: 1.8;
}

.tool-desc-block pre, .tool-desc-block code {
  color: inherit;
  background: inherit;
  border: inherit;
}

.compression-settings {
  background: #1e2130;
  border-radius: 8px;
  margin-bottom: 1.5rem;
  border: 1px solid var(--input-border, #2d3950);
}
body.light-theme .compression-settings {
  background: #f6f8fa;
  border: 1px solid var(--input-border, #ccc);
}

select.form-control, .compression-settings select {
  background: var(--input-bg) !important;
  color: var(--input-color) !important;
  border: 1px solid var(--input-border) !important;
  border-radius: 8px;
  font-size: 1rem;
  padding: 0.5rem 2.2rem 0.5rem 0.8rem;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  box-shadow: none;
  transition: background 0.2s, color 0.2s, border 0.2s;
}
select.form-control:focus, .compression-settings select:focus {
  border-color: #2979ff !important;
  box-shadow: 0 0 0 2px rgba(41,121,255,0.12);
}

/* 下拉菜单选项的主题适配（部分浏览器支持） */
select.form-control option, .compression-settings select option {
  background: var(--input-bg);
  color: var(--input-color);
}

.compression-settings .setting-group label {
  color: #e6eaf3;
  font-weight: 600;
}
body.light-theme .compression-settings .setting-group label {
  color: #232b39;
}

body.light-theme {
  --bg-main: #fff;
} 
body.light-theme .main-content,
body.light-theme .footer {
  background: #fff !important;
} 
/* html, body {
  background: var(--bg-main) !important;
  color: var(--text-main) !important;
} */
body.light-theme, body.light-theme html, html body.light-theme {
  background: #fff !important;
}