/* ================================
   航空航天博客主题 - 主样式文件
   Aerospace Blog Theme
   ================================ */

/* ===== CSS Variables ===== */
:root {
  --color-primary: #0f2847;
  --color-primary-dark: #0a1628;
  --color-primary-light: #1e3a5f;
  --color-primary-accent: #3b82f6;
  --color-secondary: #94a3b8;
  --color-secondary-light: #cbd5e1;
  --color-accent: #f97316;
  --color-accent-warm: #fb923c;
  --color-bg: #f0f4f8;
  --color-bg-alt: #ffffff;
  --color-bg-gradient: linear-gradient(135deg, #f0f4f8 0%, #e8edf5 100%);
  --color-text: #0a1628;
  --color-text-light: #64748b;
  --color-text-white: #ffffff;
  --color-border: #d1dce8;
  --color-border-light: #e8edf5;
  --color-overlay: rgba(10, 22, 40, 0.65);
  --color-shadow: rgba(10, 22, 40, 0.06);
  --color-shadow-hover: rgba(10, 22, 40, 0.12);

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Songti SC", "SimSun", "Georgia", serif;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 999px;

  --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);

  --header-height: 72px;
  --max-width: 1280px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.8;
  overflow-x: hidden;
}

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

ul, ol {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-primary-dark);
}

/* ===== Utility Classes ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.text-center { text-align: center; }
.text-left { text-align: left; }

.section {
  padding: 80px 0;
}

.section-sm {
  padding: 48px 0;
}

.section-title {
  font-size: 2.2rem;
  text-align: center;
  margin-bottom: 16px;
  position: relative;
  color: var(--color-primary-dark);
}

.section-title.gradient-text {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary), var(--color-primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-light);
  font-size: 1.05rem;
  margin-bottom: 56px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.section-title::after {
  content: "";
  display: block;
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-secondary), var(--color-accent), var(--color-primary-accent));
  border-radius: var(--radius-full);
  margin: 20px auto 0;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 32px;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  letter-spacing: 0.5px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: var(--color-text-white);
  box-shadow: 0 4px 16px rgba(10, 22, 40, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary-accent));
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(10, 22, 40, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--color-text-white);
  border: 2px solid rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: white;
  color: white;
  backdrop-filter: blur(12px);
}

.btn-gold {
  background: linear-gradient(135deg, var(--color-secondary), var(--color-accent));
  color: var(--color-text);
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(148, 163, 184, 0.3);
}

.btn-gold:hover {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-warm));
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(249, 115, 22, 0.4);
}

/* ===== Header / Navigation ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: transparent;
  backdrop-filter: blur(0);
  -webkit-backdrop-filter: blur(0);
  box-shadow: none;
  z-index: 1000;
  transition: var(--transition);
  overflow: visible;
}

/* ===== Subpage Header - 默认深色背景 ===== */
.subpage-header {
  background: linear-gradient(135deg, rgba(10, 22, 40, 0.98), rgba(15, 40, 71, 0.95)) !important;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.subpage-header .logo {
  color: white;
}

.subpage-header .logo-icon {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.4);
}

.subpage-header .nav-menu a {
  color: rgba(255, 255, 255, 0.95);
}

.subpage-header .nav-menu a:hover,
.subpage-header .nav-menu a.active {
  color: white;
}

.subpage-header .nav-menu a::after {
  background: rgba(255, 255, 255, 0.8);
}

.subpage-header .nav-toggle span {
  background: white;
}

/* ===== 滚动后样式 ===== */
.site-header.scrolled {
  background: rgba(255, 255, 255, 0.98) !important;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 4px 24px rgba(10, 22, 40, 0.08);
}

.site-header.scrolled .logo {
  color: var(--color-primary-dark) !important;
}

.site-header.scrolled .logo-icon {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light)) !important;
  border-color: transparent !important;
}

.site-header.scrolled .nav-menu a {
  color: var(--color-text) !important;
}

.site-header.scrolled .nav-menu a:hover,
.site-header.scrolled .nav-menu a.active {
  color: var(--color-primary) !important;
}

.site-header.scrolled .nav-menu a::after {
  background: var(--color-secondary) !important;
}

.site-header.scrolled .nav-toggle span {
  background: var(--color-primary-dark) !important;
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 800;
  color: white;
  white-space: nowrap;
  transition: var(--transition);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: white;
  flex-shrink: 0;
  border: 1px solid rgba(255, 255, 255, 0.3);
  transition: var(--transition);
}

.logo-text {
  display: inline-block;
  line-height: 1.2;
}

.site-header.scrolled .logo {
  color: var(--color-primary-dark) !important;
}

.site-header.scrolled .logo-icon {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  border-color: transparent;
}

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

.nav-menu a {
  padding: 8px 16px;
  font-size: 0.95rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-sm);
  position: relative;
  transition: var(--transition);
}

.nav-menu a::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: rgba(255, 255, 255, 0.8);
  transition: var(--transition);
}

.nav-menu a:hover,
.nav-menu a.active {
  color: white;
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 24px;
}

.site-header.scrolled .nav-menu a {
  color: var(--color-text) !important;
}

.site-header.scrolled .nav-menu a::after {
  background: var(--color-secondary);
}

.site-header.scrolled .nav-menu a:hover,
.site-header.scrolled .nav-menu a.active {
  color: var(--color-primary) !important;
}

.nav-menu .has-submenu {
  position: relative;
}

.nav-menu .has-submenu > a {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-menu .submenu-arrow {
  font-size: 0.75rem;
  transition: var(--transition);
}

.nav-menu .has-submenu:hover > a .submenu-arrow {
  transform: rotate(180deg);
}

.nav-menu .submenu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 180px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: var(--transition);
  z-index: 1001;
}

.nav-menu .has-submenu:hover > .submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-menu .submenu li {
  display: block;
}

.nav-menu .submenu li a {
  display: block;
  padding: 10px 20px;
  font-size: 0.9rem;
  color: var(--color-text);
  border-radius: 0;
  white-space: nowrap;
}

.nav-menu .submenu li a:hover,
.nav-menu .submenu li a.active {
  background: rgba(0, 0, 0, 0.05);
  color: var(--color-primary);
}

.nav-menu .submenu li a::after {
  display: none;
}

.site-header.scrolled .nav-menu .submenu {
  background: rgba(255, 255, 255, 0.98);
}

.search-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  color: white;
  font-size: 1.1rem;
  cursor: pointer;
  transition: var(--transition);
  margin-right: 8px;
}

.search-toggle:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.05);
}

.site-header.scrolled .search-toggle {
  background: rgba(10, 22, 40, 0.08);
  border-color: rgba(10, 22, 40, 0.15);
  color: var(--color-primary-dark);
}

.site-header.scrolled .search-toggle:hover {
  background: rgba(10, 22, 40, 0.15);
}

.search-box {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(-10px);
  width: 90%;
  max-width: 500px;
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px rgba(10, 22, 40, 0.15);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 1001;
}

.search-box.active {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.search-box form {
  display: flex;
  align-items: center;
  gap: 8px;
}

.search-box input {
  flex: 1;
  padding: 14px 20px;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  background: var(--color-bg);
  color: var(--color-text);
  outline: none;
}

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

.search-box button {
  width: 48px;
  height: 48px;
  border: none;
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: white;
  font-size: 1.1rem;
  cursor: pointer;
  transition: var(--transition);
}

.search-box button:hover {
  background: var(--color-primary-light);
  transform: scale(1.05);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}

.nav-toggle span {
  width: 26px;
  height: 3px;
  background: white;
  border-radius: var(--radius-full);
  transition: var(--transition);
}

.site-header.scrolled .nav-toggle span {
  background: var(--color-primary-dark);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

/* ===== Hero Section ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  padding-top: var(--header-height);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10, 22, 40, 0.8), rgba(15, 40, 71, 0.6), rgba(30, 58, 95, 0.4));
  z-index: 1;
}

.hero-bg img {
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 900px;
  padding: 0 24px;
  animation: fadeInUp 1s ease;
}

.hero-content h1 {
  font-size: 3.2rem;
  color: var(--color-text-white);
  margin-bottom: 20px;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.hero-content p {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 36px;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.8rem;
  text-align: center;
  animation: bounce 2s infinite;
}

.hero-scroll svg {
  display: block;
  margin: 8px auto 0;
}

/* ===== Page Banner (sub pages) ===== */
.page-banner {
  position: relative;
  height: 340px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  margin-top: var(--header-height);
}

.page-banner-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.page-banner-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-banner-bg::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(10, 22, 40, 0.95), rgba(15, 40, 71, 0.9));
}

.page-banner-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  padding: 0 24px;
  text-align: center;
}

.page-banner h1 {
  font-size: 2.5rem;
  color: var(--color-text-white);
  margin-bottom: 12px;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
  position: relative;
  z-index: 1;
}

.page-banner p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.05rem;
}

.page-banner .category-description {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1rem;
  line-height: 1.7;
  max-width: 640px;
  margin: 8px auto 0;
  padding: 0 16px;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.breadcrumb-container {
  background: var(--color-bg);
  padding: 16px 0;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--color-text-light);
  padding: 0;
  margin: 0;
}

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

.breadcrumb span {
  color: var(--color-text-light);
}

/* ===== Features / Cards Grid ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
}

.feature-card {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  box-shadow: 0 4px 20px var(--color-shadow);
  transition: var(--transition);
  border: 1px solid var(--color-border-light);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-accent), var(--color-secondary));
  transform: scaleX(0);
  transition: var(--transition);
}

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

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 16px 48px var(--color-shadow-hover);
  border-color: var(--color-primary-accent);
}

.feature-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  background: linear-gradient(135deg, rgba(10, 22, 40, 0.1), rgba(30, 58, 95, 0.15));
  border: 2px solid rgba(59, 130, 246, 0.3);
  transition: var(--transition);
}

.feature-card:hover .feature-icon {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-accent));
  border-color: var(--color-primary-accent);
  transform: scale(1.1);
}

.feature-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--color-text-light);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* ===== Article Cards ===== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 32px;
}

.article-card {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 4px 20px var(--color-shadow);
  transition: var(--transition);
  border: 1px solid var(--color-border-light);
}

.article-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 16px 48px var(--color-shadow-hover);
  border-color: var(--color-primary-accent);
}

.article-card-img {
  width: 100%;
  height: 220px;
  overflow: hidden;
  position: relative;
}

.article-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.article-card:hover .article-card-img img {
  transform: scale(1.1);
}

.article-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  background: linear-gradient(135deg, var(--color-secondary), var(--color-accent));
  color: var(--color-text);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  backdrop-filter: blur(4px);
}

.article-card-body {
  padding: 24px;
}

.article-card-body h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
  line-height: 1.5;
}

.article-card-body h3 a:hover {
  color: var(--color-primary);
}

.article-card-body p {
  color: var(--color-text-light);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--color-text-light);
}

.article-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ===== Content Layout ===== */
.content-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 48px;
  align-items: start;
}

.content-main {
  min-width: 0;
}

.content-sidebar {
  position: sticky;
  top: 96px;
}

.article-detail pre {
  overflow-x: auto;
  max-width: 100%;
  white-space: pre;
  word-wrap: normal;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 0.88rem;
  line-height: 1.7;
  border: 1px solid var(--color-border);
  margin: 20px 0;
}

.article-detail pre::-webkit-scrollbar {
  height: 4px;
}

.article-detail pre::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 2px;
}

.article-detail pre code {
  background: none;
  padding: 0;
  font-family: var(--font-mono, "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace);
  font-size: inherit;
  color: var(--color-text);
}

.article-detail code:not(pre code) {
  background: rgba(59, 130, 246, 0.08);
  color: var(--color-primary);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono, "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace);
  font-size: 0.88em;
}

.article-content {
  overflow-x: hidden;
}
.article-detail {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: 0 2px 12px var(--color-shadow);
  border: 1px solid var(--color-border);
}

.article-detail h2 {
  font-size: 1.8rem;
  margin-bottom: 16px;
  line-height: 1.5;
  scroll-margin-top: 100px;
}

.article-detail .article-meta {
  margin-bottom: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--color-border);
}

.article-detail p {
  margin-bottom: 20px;
  color: var(--color-text);
  font-size: 1rem;
  line-height: 2;
}

.article-detail h3 {
  font-size: 1.3rem;
  margin: 32px 0 16px;
  padding-left: 16px;
  border-left: 4px solid var(--color-primary);
  scroll-margin-top: 100px;
}

.article-detail h4 {
  font-size: 1.1rem;
  margin: 24px 0 12px;
  scroll-margin-top: 100px;
}

.article-detail img {
  width: 100%;
  border-radius: var(--radius-md);
  margin: 24px 0;
}

.article-detail figure {
  margin: 28px 0;
}

.article-detail figcaption {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-top: 8px;
}

.article-detail blockquote {
  background: var(--color-bg);
  border-left: 4px solid var(--color-secondary);
  padding: 20px 28px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 24px 0;
  color: var(--color-text-light);
  font-style: italic;
}

/* Article Table */
.article-detail .table-wrap {
  overflow-x: auto;
  margin: 24px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.article-detail table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  line-height: 1.7;
  white-space: nowrap;
}

.article-detail table thead {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
}

.article-detail table thead th {
  color: white;
  font-weight: 600;
  text-align: left;
  padding: 14px 18px;
  border: none;
  white-space: nowrap;
}

.article-detail table tbody tr {
  border-bottom: 1px solid var(--color-border);
  transition: background 0.2s ease;
}

.article-detail table tbody tr:nth-child(even) {
  background: rgba(59, 130, 246, 0.03);
}

.article-detail table tbody tr:hover {
  background: rgba(59, 130, 246, 0.08);
}

.article-detail table tbody td {
  padding: 12px 18px;
  color: var(--color-text);
  border: none;
  vertical-align: top;
}

.article-detail table tbody td code {
  font-size: 0.85em;
}

.article-detail table tbody tr:last-child {
  border-bottom: none;
}

.article-detail ul.content-list,
.article-detail ol.content-list {
  margin: 16px 0 24px 20px;
  padding-left: 20px;
}

.article-detail ul.content-list li,
.article-detail ol.content-list li {
  list-style: disc;
  margin-bottom: 10px;
  color: var(--color-text);
  line-height: 1.8;
}

.article-detail ol.content-list li {
  list-style: decimal;
}

/* ===== Sidebar Widgets ===== */
.widget {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 24px;
  box-shadow: 0 2px 12px var(--color-shadow);
  border: 1px solid var(--color-border);
}

.widget-title {
  font-size: 1.1rem;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--color-border);
  position: relative;
}

.widget-title::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 50px;
  height: 2px;
  background: var(--color-primary);
}

.widget-list li {
  padding: 12px 0;
  border-bottom: 1px dashed var(--color-border);
  font-size: 0.9rem;
  transition: var(--transition);
}

.widget-list li:last-child {
  border-bottom: none;
}

.widget-list li a {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  overflow: hidden;
}

.widget-list li a span:last-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.widget-list li:hover a {
  color: var(--color-primary);
}

.widget-list .num {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-bg);
  color: var(--color-text-light);
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.widget-list li:nth-child(1) .num,
.widget-list li:nth-child(2) .num,
.widget-list li:nth-child(3) .num {
  background: var(--color-secondary);
  color: white;
}

.widget-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.widget-tags a {
  padding: 6px 16px;
  background: var(--color-bg);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  color: var(--color-text-light);
  transition: var(--transition);
}

.widget-tags a:hover {
  background: var(--color-primary);
  color: white;
}

/* ===== TOC Widget ===== */
.toc-widget {
  max-height: calc(100vh - 120px);
  display: flex;
  flex-direction: column;
}

.toc-nav {
  overflow-y: auto;
  max-height: calc(100vh - 200px);
  padding-right: 4px;
}

.toc-nav::-webkit-scrollbar {
  width: 3px;
}

.toc-nav::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

.toc-nav .toc-item {
  display: block;
  padding: 6px 12px;
  font-size: 0.82rem;
  color: var(--color-text-light);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: var(--transition);
  line-height: 1.5;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.toc-nav .toc-item:hover {
  color: var(--color-primary);
  border-left-color: var(--color-primary-accent);
  background: rgba(59, 130, 246, 0.04);
}

.toc-nav .toc-item.active {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  background: rgba(59, 130, 246, 0.08);
  font-weight: 600;
}

.toc-nav .toc-h3 {
  padding-left: 24px;
}

.toc-nav .toc-h4 {
  padding-left: 36px;
  font-size: 0.78rem;
}

.toc-nav .toc-h5 {
  padding-left: 48px;
  font-size: 0.75rem;
}

/* ===== Stats Section ===== */
.stats-section {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary), #1e3a5f);
  padding: 72px 0;
  position: relative;
  overflow: hidden;
}

.stats-section::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
  border-radius: 50%;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  text-align: center;
  position: relative;
  z-index: 1;
}

.stat-item {
  color: white;
  padding: 20px;
}

.stat-number {
  font-size: 3rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-secondary-light), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 12px;
  transition: var(--transition);
}

.stat-item:hover .stat-number {
  transform: scale(1.1);
}

.stat-label {
  font-size: 0.95rem;
  opacity: 0.85;
  color: rgba(255, 255, 255, 0.9);
}

/* ===== Timeline ===== */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding: 20px 0;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--color-border);
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  width: 50%;
  padding: 20px 40px;
  margin-bottom: 20px;
}

.timeline-item:nth-child(odd) {
  left: 0;
}

.timeline-item:nth-child(even) {
  left: 50%;
}

.timeline-dot {
  position: absolute;
  top: 28px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-bg);
  z-index: 1;
}

.timeline-item:nth-child(odd) .timeline-dot {
  right: -8px;
}

.timeline-item:nth-child(even) .timeline-dot {
  left: -8px;
}

.timeline-content {
  background: var(--color-bg-alt);
  padding: 24px;
  border-radius: var(--radius-md);
  box-shadow: 0 2px 12px var(--color-shadow);
  border: 1px solid var(--color-border);
}

.timeline-content .year {
  color: var(--color-secondary);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.timeline-content h4 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.timeline-content p {
  font-size: 0.88rem;
  color: var(--color-text-light);
}

/* ===== Acupoint Cards ===== */
.acupoint-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
}

.acupoint-card {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 2px 12px var(--color-shadow);
  transition: var(--transition);
  border: 1px solid var(--color-border);
}

.acupoint-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px var(--color-shadow-hover);
}

.acupoint-card-header {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  padding: 20px 24px;
  color: white;
}

.acupoint-card-header h3 {
  color: white;
  font-size: 1.2rem;
  margin-bottom: 4px;
}

.acupoint-card-header span {
  font-size: 0.82rem;
  opacity: 0.85;
}

.acupoint-card-body {
  padding: 24px;
}

.acupoint-card-body p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 12px;
}

.acupoint-card-body .effect-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.acupoint-card-body .effect-list span {
  padding: 4px 12px;
  background: var(--color-bg);
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  color: var(--color-primary);
}

/* ===== Technique Steps ===== */
.technique-section {
  margin-bottom: 48px;
}

.technique-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.technique-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: white;
  font-size: 1.3rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.technique-header h3 {
  font-size: 1.3rem;
}

.technique-body {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: 0 2px 12px var(--color-shadow);
  border: 1px solid var(--color-border);
}

.technique-body p {
  margin-bottom: 16px;
  color: var(--color-text);
  line-height: 2;
}

.technique-img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin: 20px 0;
}

/* ===== Season Cards ===== */
.season-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 28px;
}

.season-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 2px 12px var(--color-shadow);
  transition: var(--transition);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
}

.season-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px var(--color-shadow-hover);
}

.season-card-img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.season-card-body {
  padding: 24px;
}

.season-card-body h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.season-card-body .season-tag {
  display: inline-block;
  padding: 3px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.season-spring .season-tag { background: #fee2e2; color: #dc2626; }
.season-summer .season-tag { background: #dbeafe; color: #1d4ed8; }
.season-autumn .season-tag { background: #ede9fe; color: #7c3aed; }
.season-winter .season-tag { background: #1e293b; color: #f1f5f9; }

.season-card-body p {
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ===== Info Box ===== */
.info-box {
  background: linear-gradient(135deg, #e8edf5, #f0f4f8);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  margin: 28px 0;
  border-left: 5px solid var(--color-primary);
}

.info-box.warning {
  background: linear-gradient(135deg, #fff7ed, #fffbeb);
  border-left-color: var(--color-accent);
}

.info-box h4 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 1.05rem;
}

.info-box p {
  margin-bottom: 0;
  color: var(--color-text-light);
  font-size: 0.92rem;
}

/* ===== CTA Section ===== */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary), #1e3a5f);
  border-radius: var(--radius-lg);
  padding: 72px 48px;
  text-align: center;
  color: white;
  margin: 72px 0;
  position: relative;
  overflow: hidden;
  box-shadow: 0 12px 48px rgba(10, 22, 40, 0.3);
}

.cta-section::before {
  content: "";
  position: absolute;
  top: -30%;
  left: -30%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.1) 0%, transparent 70%);
  border-radius: 50%;
}

.cta-section::after {
  content: "";
  position: absolute;
  bottom: -30%;
  right: -30%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(148, 163, 184, 0.1) 0%, transparent 70%);
  border-radius: 50%;
}

.cta-section h2 {
  color: white;
  font-size: 2.2rem;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.cta-section p {
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 36px;
  font-size: 1.1rem;
  position: relative;
  z-index: 1;
}

/* ===== About Page ===== */
.about-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.about-hero-text h2 {
  font-size: 2rem;
  margin-bottom: 20px;
}

.about-hero-text p {
  color: var(--color-text-light);
  margin-bottom: 16px;
  line-height: 2;
}

.about-hero-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 12px 40px var(--color-shadow-hover);
}

.about-hero-img img {
  width: 100%;
  height: 400px;
  object-fit: cover;
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 28px;
  margin-top: 48px;
}

.value-card {
  text-align: center;
  padding: 32px 24px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 12px var(--color-shadow);
  border: 1px solid var(--color-border);
  transition: var(--transition);
}

.value-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px var(--color-shadow-hover);
}

.value-card .icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.value-card h4 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.value-card p {
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ===== Contact Form ===== */
.contact-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info h3 {
  font-size: 1.4rem;
  margin-bottom: 20px;
}

.contact-info p {
  color: var(--color-text-light);
  margin-bottom: 24px;
  line-height: 2;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.contact-item .icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.contact-item .text h5 {
  font-size: 0.9rem;
  margin-bottom: 2px;
}

.contact-item .text p {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin: 0;
}

.contact-form {
  background: var(--color-bg-alt);
  padding: 36px;
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 12px var(--color-shadow);
  border: 1px solid var(--color-border);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-family: var(--font-sans);
  transition: var(--transition);
  background: var(--color-bg);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  background: white;
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* ===== Footer ===== */
.site-footer {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: rgba(255, 255, 255, 0.8);
  padding: 72px 0 0;
  position: relative;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-secondary-light), var(--color-primary-accent));
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  padding-bottom: 48px;
}

.footer-brand h3 {
  color: white;
  font-size: 1.4rem;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.9;
  margin-bottom: 24px;
  color: rgba(255, 255, 255, 0.65);
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: var(--transition);
}

.footer-social a:hover {
  background: linear-gradient(135deg, var(--color-accent), var(--color-primary-accent));
  border-color: transparent;
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(148, 163, 184, 0.3);
}

.footer-col h4 {
  color: white;
  font-size: 1.05rem;
  margin-bottom: 24px;
  position: relative;
  padding-bottom: 14px;
}

.footer-col h4::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-primary-accent));
  border-radius: var(--radius-full);
}

.footer-col ul li {
  margin-bottom: 12px;
}

.footer-col ul li a {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.65);
  transition: var(--transition);
  display: inline-block;
}

.footer-col ul li a:hover {
  color: var(--color-secondary-light);
  padding-left: 8px;
}

.footer-categories-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.footer-contact p {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 28px 0;
  text-align: center;
  background: rgba(0, 0, 0, 0.1);
}

.footer-bottom p {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom a {
  color: var(--color-secondary-light);
  font-weight: 600;
  transition: var(--transition);
}

.footer-bottom a:hover {
  color: var(--color-accent);
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: white;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
  box-shadow: 0 4px 20px rgba(10, 22, 40, 0.3);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: linear-gradient(135deg, var(--color-primary-accent), var(--color-primary-light));
  transform: translateY(-6px);
  box-shadow: 0 8px 28px rgba(59, 130, 246, 0.4);
}

/* ===== Animations ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-10px); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Comments Section ===== */
.comment-section {
  margin-top: 48px;
}

.comment-section-title {
  font-size: 1.3rem;
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--color-border);
  position: relative;
}

.comment-section-title::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 50px;
  height: 2px;
  background: var(--color-primary);
}

.comment-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.comment-list li {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.comment-list li:last-child {
  border-bottom: none;
}

.comment-item {
  display: flex;
  gap: 16px;
}

.comment-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}

.comment-body {
  flex: 1;
  min-width: 0;
}

.comment-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.comment-author {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-primary-dark);
}

.comment-time {
  font-size: 0.8rem;
  color: var(--color-text-light);
}

.comment-reply-link {
  font-size: 0.8rem;
}

.comment-reply-link a {
  color: var(--color-primary-accent);
  cursor: pointer;
}

.comment-reply-link a:hover {
  color: var(--color-primary);
}

.comment-content {
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--color-text);
}

.comment-children {
  list-style: none;
  padding-left: 40px;
  margin-top: 0;
}

.comment-children li {
  padding-top: 16px;
}

/* Comment Form */
.comment-form {
  margin-top: 32px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: 0 2px 12px var(--color-shadow);
  border: 1px solid var(--color-border);
}

.comment-form h3 {
  font-size: 1.2rem;
  margin-bottom: 20px;
}

.comment-form .form-group {
  display: block;
  margin-bottom: 0;
}

.comment-form form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.comment-form .form-group.full-width {
  grid-column: 1 / -1;
}

.comment-form input,
.comment-form textarea {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: var(--font-sans);
  transition: var(--transition);
  background: var(--color-bg);
}

.comment-form input:focus,
.comment-form textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  background: white;
}

.comment-form textarea {
  min-height: 120px;
  resize: vertical;
}

.comment-form .btn {
  margin-top: 8px;
}

.comment-form .captcha-row {
  grid-column: 1 / -1;
  margin-bottom: 0;
}

.comment-form .captcha-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.comment-form .captcha-group {
  display: flex;
  gap: 10px;
  align-items: stretch;
}

.comment-form .captcha-input {
  width: 120px;
  flex: none;
  height: 44px;
  padding: 0 16px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: inherit;
  background: white;
  color: var(--color-text);
  transition: all 0.25s ease;
  outline: none;
}

.comment-form .captcha-input::placeholder {
  color: var(--color-text-light);
}

.comment-form .captcha-input:focus {
  border-color: var(--color-primary);
  background: white;
}

.comment-form .captcha-img-wrapper {
  height: 44px;
  width: 120px;
  background: white;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  cursor: pointer;
  transition: all 0.25s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.comment-form .captcha-img-wrapper:hover {
  border-color: var(--color-primary-accent);
}

.comment-form .captcha-img {
  height: 100%;
  width: 100%;
  object-fit: cover;
}

.comment-form .captcha-refresh {
  height: 44px;
  padding: 0 14px;
  background: white;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-light);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.25s ease;
  text-decoration: none;
  display: flex;
  align-items: center;
  white-space: nowrap;
  font-family: inherit;
}

.comment-form .captcha-refresh:hover {
  background: var(--color-bg);
  color: var(--color-primary);
  border-color: var(--color-primary-accent);
}

/* ===== Post Navigation ===== */
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.post-nav-item {
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  box-shadow: 0 2px 8px var(--color-shadow);
  border: 1px solid var(--color-border-light);
  transition: var(--transition);
}

.post-nav-item:hover {
  border-color: var(--color-primary-accent);
  box-shadow: 0 4px 16px var(--color-shadow-hover);
  transform: translateY(-3px);
}

.post-nav-item.next {
  text-align: right;
}

.post-nav-label {
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-bottom: 6px;
}

.post-nav-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-primary-dark);
}

/* ===== Pagination ===== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 48px;
  flex-wrap: wrap;
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 44px;
  padding: 0 12px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
  border: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  color: var(--color-text);
}

.pagination a:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-bg);
}

.pagination .current {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: white;
  border-color: transparent;
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
  .content-layout {
    grid-template-columns: 1fr;
  }

  .content-sidebar {
    position: static;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .about-hero {
    grid-template-columns: 1fr;
  }

  .contact-section {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  /* 移动端 header 强制深色背景，确保汉堡按钮可见 */
  .site-header {
    background: linear-gradient(135deg, rgba(10, 22, 40, 0.98), rgba(15, 40, 71, 0.95)) !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
  }

  .site-header.scrolled {
    background: linear-gradient(135deg, rgba(10, 22, 40, 0.98), rgba(15, 40, 71, 0.95)) !important;
  }

  .site-header .logo,
  .site-header.scrolled .logo {
    color: white !important;
  }

  .site-header .logo-icon,
  .site-header.scrolled .logo-icon {
    background: rgba(255, 255, 255, 0.2) !important;
    border-color: rgba(255, 255, 255, 0.4) !important;
  }

  .site-header .nav-toggle span,
  .site-header.scrolled .nav-toggle span {
    background: white !important;
  }

  /* 遮罩层 */
  .nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
  }

  .nav-overlay.active {
    display: block;
  }

  /* 菜单面板 — 用 absolute 避免 backdrop-filter 的 containing block 问题 */
  .nav-menu {
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: #ffffff;
    flex-direction: column;
    align-items: stretch;
    padding: 12px 20px;
    gap: 2px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    transform: translateY(-200%);
    overflow-x: visible;
    flex-wrap: wrap;
    transition: transform 0.3s ease;
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
    z-index: 999;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
  }

  .nav-menu.active {
    transform: translateY(0);
  }

  .nav-menu li {
    list-style: none;
  }

  .nav-menu a,
  .subpage-header .nav-menu a,
  .site-header.scrolled .nav-menu a {
    display: block;
    padding: 14px 16px;
    font-size: 1rem;
    font-weight: 500;
    color: #1a1a2e !important;
    border-radius: var(--radius-md);
    position: relative;
    transition: var(--transition);
  }

  .nav-menu a:hover,
  .nav-menu a.active,
  .subpage-header .nav-menu a:hover,
  .subpage-header .nav-menu a.active {
    background: var(--color-bg);
    color: var(--color-primary) !important;
  }

  .nav-menu a::after,
  .subpage-header .nav-menu a::after {
    display: none !important;
  }

  .nav-menu .has-submenu > a {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .nav-menu .submenu-arrow {
    font-size: 0.8rem;
    transition: var(--transition);
  }

  .nav-menu .has-submenu.submenu-open > a .submenu-arrow {
    transform: rotate(180deg);
  }

  .nav-menu .submenu {
    position: static;
    display: none;
    background: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    box-shadow: none;
    padding: 0;
    opacity: 1;
    visibility: visible;
    transform: none;
    margin-left: 16px;
    border-left: 2px solid var(--color-border);
  }

  .nav-menu .has-submenu.submenu-open > .submenu {
    display: block;
  }

  .nav-menu .submenu li a {
    padding: 10px 16px;
    font-size: 0.95rem;
    color: #666 !important;
  }

  .nav-menu .submenu li a:hover,
  .nav-menu .submenu li a.active {
    color: var(--color-primary) !important;
    background: rgba(0, 0, 0, 0.03);
  }

  .nav-toggle {
    display: flex;
  }

  .search-toggle {
    display: flex;
  }

  .search-box {
    top: calc(100% + 8px);
    width: calc(100% - 48px);
    max-width: none;
  }

  .logo-text {
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .hero-content h1 {
    font-size: 2.2rem;
  }

  .hero-content p {
    font-size: 1rem;
  }

  .section {
    padding: 56px 0;
  }

  .section-title {
    font-size: 1.6rem;
  }

  .article-detail {
    padding: 28px;
  }

  .article-detail h2 {
    font-size: 1.4rem;
  }

  .cta-section {
    padding: 40px 24px;
  }

  .cta-section h2 {
    font-size: 1.5rem;
  }

  .timeline::before {
    left: 20px;
  }

  .timeline-item {
    width: 100%;
    padding-left: 50px;
    padding-right: 0;
  }

  .timeline-item:nth-child(even) {
    left: 0;
  }

  .timeline-item:nth-child(odd) .timeline-dot,
  .timeline-item:nth-child(even) .timeline-dot {
    left: 12px;
    right: auto;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .stat-number {
    font-size: 2.2rem;
  }

  .page-banner {
    height: 280px;
  }

  .page-banner h1 {
    font-size: 1.6rem;
  }

  .post-nav {
    grid-template-columns: 1fr;
  }

  .comment-form form {
    grid-template-columns: 1fr;
  }

  .comment-children {
    padding-left: 20px;
  }

  .article-detail {
    padding: 24px 20px;
  }

  .article-detail table {
    font-size: 0.85rem;
  }

  .article-detail table thead th {
    padding: 10px 12px;
  }

  .article-detail table tbody td {
    padding: 10px 12px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-content h1 {
    font-size: 1.8rem;
  }

  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }

  .hero-buttons .btn {
    width: 100%;
    justify-content: center;
  }

  .section-title {
    font-size: 1.4rem;
  }

  .articles-grid {
    grid-template-columns: 1fr;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .article-detail {
    padding: 20px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }
}