/* ===== Biosyner 生物小工具 - 全站统一样式 =====
   设计风格参考主站 www.biosyner.cn
   主色调：橙色 #EC6919
*/

:root {
  --color-primary: #EC6919;
  --color-primary-strong: #D35A0F;
  --color-primary-soft: #FFF3E0;
  --color-primary-gradient: linear-gradient(135deg, #EC6919, #F48C06);
  --color-success: #7CB342;
  --color-danger: #D32F2F;
  --color-warning: #F57C00;
  --color-info: #1E88E5;
  --color-bg: #FAFAFA;
  --color-surface: #FFFFFF;
  --color-surface-muted: #F5F5F5;
  --color-surface-dark: #2C2C2C;
  --color-border: #E0E0E0;
  --color-text: #333333;
  --color-text-light: #FFFFFF;
  --color-muted: #666666;
  --color-subtle: #999999;
  --font-mono: 'Consolas', 'Monaco', 'Courier New', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --shadow-primary: 0 4px 12px rgba(236, 105, 25, 0.25);
  --transition: 0.2s ease;
  --max-width: 1280px;
  --header-height: 64px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  min-height: 100vh;
  line-height: 1.6;
  font-size: 14px;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-primary-strong);
}

/* ===== 顶部导航栏 ===== */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-top {
  background: var(--color-surface-dark);
  color: #fff;
  padding: 8px 0;
  font-size: 12px;
}

.header-top-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 20px;
}

.header-top a {
  color: rgba(255, 255, 255, 0.8);
}

.header-top a:hover {
  color: var(--color-primary);
}

.header-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.logo img {
  height: 40px;
  width: auto;
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.5px;
}

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

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}

.nav-item {
  padding: 8px 18px;
  color: var(--color-text);
  font-weight: 500;
  font-size: 15px;
  border-radius: var(--radius-md);
  transition: all var(--transition);
  cursor: pointer;
}

.nav-item:hover {
  color: var(--color-primary);
  background: var(--color-primary-soft);
}

.nav-item.active {
  color: var(--color-primary);
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--color-surface-muted);
  border-radius: 32px;
  padding: 6px 16px;
  border: 1px solid transparent;
  transition: all var(--transition);
}

.search-box:focus-within {
  border-color: var(--color-primary);
  background: var(--color-surface);
  box-shadow: 0 0 0 3px rgba(236, 105, 25, 0.1);
}

.search-box input {
  border: none;
  background: transparent;
  outline: none;
  font-size: 13px;
  width: 160px;
  font-family: inherit;
}

.search-box button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-subtle);
  font-size: 16px;
}

.btn-primary {
  background: var(--color-primary-gradient);
  color: #fff;
  border: none;
  padding: 9px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: var(--shadow-primary);
  font-family: inherit;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(236, 105, 25, 0.35);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  padding: 8px 18px;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 14px;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.btn-ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-soft);
}

/* ===== 主内容区 ===== */
.main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 24px;
  min-height: calc(100vh - var(--header-height) - 200px);
}

/* ===== Hero区域 ===== */
.hero-section {
  background: linear-gradient(135deg, #2C2C2C 0%, #1a1a1a 100%);
  color: #fff;
  padding: 60px 24px;
  margin: 0 -24px 32px;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: radial-gradient(circle at 80% 50%, rgba(236, 105, 25, 0.15) 0%, transparent 60%);
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -1px;
}

.hero-title span {
  color: var(--color-primary);
}

.hero-subtitle {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 28px;
  max-width: 600px;
  line-height: 1.8;
}

.hero-search {
  max-width: 500px;
  display: flex;
  gap: 12px;
}

.hero-search input {
  flex: 1;
  padding: 14px 20px;
  border-radius: 32px;
  border: none;
  font-size: 15px;
  outline: none;
  font-family: inherit;
}

.hero-search button {
  padding: 14px 32px;
  border-radius: 32px;
  background: var(--color-primary-gradient);
  color: #fff;
  border: none;
  font-weight: 600;
  cursor: pointer;
  font-size: 15px;
  transition: all var(--transition);
  font-family: inherit;
}

.hero-search button:hover {
  transform: translateY(-1px);
}

/* ===== 分类标签 ===== */
.category-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.category-tab {
  padding: 8px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 32px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-muted);
  transition: all var(--transition);
}

.category-tab:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.category-tab.active {
  background: var(--color-primary-gradient);
  border-color: transparent;
  color: #fff;
  box-shadow: var(--shadow-primary);
}

/* ===== 工具卡片网格 ===== */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.tool-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  height: 100%;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
}

.tool-card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.tool-card-link:hover .tool-card {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.tool-card-link:hover .tool-card::before {
  transform: scaleX(1);
}

.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-primary-gradient);
  transform: scaleX(0);
  transition: transform var(--transition);
  transform-origin: left;
}

.tool-icon {
  width: 56px;
  height: 56px;
  background: var(--color-primary-soft);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 16px;
}

.tool-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 47.6px;
}

.tool-desc {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 41.6px;
  flex: 1;
}

.tool-action {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tool-btn {
  padding: 7px 16px;
  background: var(--color-primary-gradient);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.tool-btn:hover {
  box-shadow: var(--shadow-primary);
}

.tool-meta {
  font-size: 12px;
  color: var(--color-subtle);
}

/* ===== 工具页面布局 ===== */
.tool-page {
  display: flex;
  gap: 24px;
}

.tool-sidebar {
  width: 240px;
  flex-shrink: 0;
}

.tool-sidebar-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.tool-sidebar-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-muted);
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.tool-sidebar-list {
  list-style: none;
}

.tool-sidebar-item {
  margin-bottom: 2px;
}

.tool-sidebar-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  color: var(--color-text);
  transition: all var(--transition);
  text-decoration: none;
}

.tool-sidebar-link:hover {
  background: var(--color-surface-muted);
  color: var(--color-primary);
}

.tool-sidebar-item.active .tool-sidebar-link {
  background: var(--color-primary-soft);
  color: var(--color-primary-strong);
  font-weight: 600;
}

.tool-sidebar-link .icon {
  font-size: 16px;
}

.tool-main {
  flex: 1;
  min-width: 0;
}

.tool-header {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.tool-header-icon {
  width: 64px;
  height: 64px;
  background: var(--color-primary-soft);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  flex-shrink: 0;
}

.tool-header-info h1 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 6px;
}

.tool-header-info p {
  font-size: 14px;
  color: var(--color-muted);
}

.tool-content {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

/* ===== 表单组件 ===== */
.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  margin-bottom: 8px;
  color: var(--color-text);
  font-weight: 600;
  font-size: 14px;
}

.form-label .required {
  color: var(--color-danger);
  margin-left: 2px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: all var(--transition);
}

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
  border-color: var(--color-subtle);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(236, 105, 25, 0.12);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
}

.form-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.form-row .form-group {
  flex: 1;
  min-width: 120px;
}

/* ===== 结果区域 ===== */
.result-section {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.result-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.result-title::before {
  content: '';
  width: 4px;
  height: 18px;
  background: var(--color-primary-gradient);
  border-radius: 2px;
}

.result-box {
  background: var(--color-surface-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  word-break: break-all;
  max-height: 300px;
  overflow-y: auto;
}

/* ===== 表格 ===== */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.data-table th {
  background: var(--color-surface-muted);
  font-weight: 600;
  color: var(--color-muted);
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}

.data-table tbody tr:hover {
  background: var(--color-surface-muted);
}

/* ===== 页脚 ===== */
.site-footer {
  background: #1a1a1a;
  color: rgba(255, 255, 255, 0.7);
  padding: 48px 24px 24px;
  margin-top: 64px;
}

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

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}

.footer-brand .logo-text {
  color: #fff;
  font-size: 24px;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 13px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.6);
}

.footer-col h4 {
  color: #fff;
  font-size: 15px;
  margin-bottom: 16px;
  font-weight: 600;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 13px;
}

.footer-col a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 20px;
  text-align: center;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
}

/* ===== 404页面 ===== */
.error-page {
  text-align: center;
  padding: 80px 20px;
}

.error-code {
  font-size: 120px;
  font-weight: 800;
  background: var(--color-primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}

.error-message {
  font-size: 20px;
  color: var(--color-text);
  margin-bottom: 12px;
}

.error-desc {
  color: var(--color-muted);
  margin-bottom: 32px;
}

/* ===== 加载动画 ===== */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ===== 提示消息 ===== */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  font-size: 14px;
}

.alert-success {
  background: rgba(124, 179, 66, 0.1);
  border: 1px solid rgba(124, 179, 66, 0.3);
  color: var(--color-success);
}

.alert-error {
  background: rgba(211, 47, 47, 0.1);
  border: 1px solid rgba(211, 47, 47, 0.3);
  color: var(--color-danger);
}

.alert-info {
  background: rgba(30, 136, 229, 0.1);
  border: 1px solid rgba(30, 136, 229, 0.3);
  color: var(--color-info);
}

.alert-warning {
  background: rgba(245, 124, 0, 0.1);
  border: 1px solid rgba(245, 124, 0, 0.3);
  color: var(--color-warning);
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--color-surface-muted);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-subtle);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .tool-page {
    flex-direction: column;
  }
  .tool-sidebar {
    width: 100%;
  }
  .tool-sidebar-card {
    position: static;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .header-main {
    padding: 0 16px;
  }
  .main-content {
    padding: 20px 16px;
  }
  .hero-section {
    padding: 40px 16px;
    margin: 0 -16px 24px;
  }
  .hero-title {
    font-size: 28px;
  }
  .tools-grid {
    grid-template-columns: 1fr;
  }
  .tool-header {
    flex-direction: column;
    text-align: center;
  }
  .tool-content {
    padding: 20px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .search-box input {
    width: 100px;
  }
}