/* WebNav Hub 样式表 - 乌克兰国旗主题 */
:root {
  /* 乌克兰国旗官方配色 */
  --ukraine-blue: #005BBB;
  --ukraine-blue-light: #1E88E5;
  --ukraine-blue-dark: #003D82;

  --ukraine-yellow: #FFD700;
  --ukraine-yellow-light: #FFED4E;
  --ukraine-yellow-dark: #E6C200;

  /* 辅助色 */
  --white: #FFFFFF;
  --black: #000000;
  --gray-light: #F5F5F5;
  --gray: #9E9E9E;
  --gray-dark: #424242;

  /* 阴影 */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 12px 32px rgba(0, 0, 0, 0.25);

  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 16px;

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: var(--ukraine-blue);
  color: var(--white);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Header 样式 */
header {
  background: var(--ukraine-yellow);
  padding: 1.25rem 1rem;
  text-align: center;
  box-shadow: var(--shadow-md);
  position: relative;
  z-index: 10;
  border-bottom: 3px solid var(--ukraine-blue);
}

header h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--ukraine-blue);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 2px;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
}

/* Navigation 样式 */
nav {
  background: var(--ukraine-yellow);
  padding: 0.65rem 0.75rem;
  position: sticky;
  top: 0;
  z-index: 999;
  box-shadow: var(--shadow-sm);
  border-bottom: 2px solid var(--ukraine-blue);
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

nav li {
  margin: 0;
}

nav a {
  display: inline-block;
  color: var(--ukraine-yellow);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius-sm);
  background: var(--ukraine-blue);
  border: 2px solid var(--ukraine-blue-dark);
  transition: all var(--transition-fast);
  position: relative;
}

nav a:hover,
nav a.active {
  background: var(--ukraine-blue-dark);
  color: var(--ukraine-yellow-light);
  border-color: var(--ukraine-yellow);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* Main Content */
main {
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 2rem;
  flex: 1;
  position: relative;
}

.category-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin: 2rem 0 1.25rem;
  color: var(--ukraine-yellow);
  padding-left: 1.25rem;
  position: relative;
  text-transform: uppercase;
  letter-spacing: 1.25px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.category-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 5px;
  height: 75%;
  background: var(--ukraine-yellow);
  border-radius: 3px;
  box-shadow: 0 0 8px var(--ukraine-yellow);
}

.category-title:first-of-type {
  margin-top: 0;
}

/* Link Grid */
.link-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 1rem;
  margin-bottom: 3rem;
}

/* Link Card */
.link-card {
  position: relative;
  background: var(--ukraine-yellow);
  border-radius: var(--border-radius-sm);
  border: 2px solid var(--ukraine-yellow-dark);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all var(--transition-normal);
  min-height: 100px;
}

.link-card::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--ukraine-blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

.link-card:hover {
  transform: translateY(-4px) scale(1.02);
  border-color: var(--ukraine-blue);
  box-shadow: var(--shadow-lg);
}

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

/* 链接填满整个卡片 */
.link-card a {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  min-height: 100px;
  padding: 1rem 0.5rem;
  text-decoration: none;
  color: inherit;
  background: var(--ukraine-yellow);
  transition: background var(--transition-fast);
}

.link-card:hover a {
  background: linear-gradient(135deg, var(--ukraine-yellow) 0%, var(--ukraine-yellow-light) 100%);
}

.link-card i {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: var(--ukraine-blue);
  transition: all var(--transition-normal);
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.1));
}

.link-card:hover i {
  transform: scale(1.15) rotate(5deg);
  filter: drop-shadow(0 3px 8px rgba(0, 91, 187, 0.4));
}

.link-card h3 {
  font-size: 0.85rem;
  font-weight: 600;
  margin: 0;
  color: var(--ukraine-blue);
  text-align: center;
  line-height: 1.3;
  max-width: 100%;
  transition: all var(--transition-fast);
  text-shadow: 0 1px 2px rgba(255, 255, 255, 0.3);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
}

.link-card:hover h3 {
  color: var(--ukraine-blue-dark);
  transform: scale(1.03);
}

/* Footer - 乌克兰主题 */
footer {
  background: var(--ukraine-yellow);
  color: var(--ukraine-blue);
  text-align: center;
  padding: 3.5rem 2rem 2rem;
  margin-top: auto;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.2);
  border-top: 5px solid var(--ukraine-blue);
  position: relative;
  z-index: 10;
}

/* 通缉令海报 */
.wanted-poster {
  max-width: 400px;
  margin: 0 auto 2rem;
  padding: 1rem;
  background: var(--ukraine-blue);
  border-radius: var(--border-radius-md);
  border: 3px solid var(--ukraine-blue-dark);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.wanted-poster::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg,
    rgba(255, 215, 0, 0.1) 0%,
    transparent 50%,
    rgba(0, 91, 187, 0.2) 100%);
  pointer-events: none;
  z-index: 1;
}

.wanted-poster img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--border-radius-sm);
  box-shadow: var(--shadow-md);
  position: relative;
  z-index: 2;
  transition: transform var(--transition-normal);
}

.wanted-poster:hover img {
  transform: scale(1.02);
}

/* 乌克兰支持卡片 */
.ukraine-support {
  max-width: 850px;
  margin: 0 auto 2.5rem;
  padding: 2.5rem 3rem;
  background: var(--ukraine-blue);
  border-radius: var(--border-radius-lg);
  border: 4px solid var(--ukraine-blue-dark);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

/* 国旗渐变背景 */
.ukraine-support::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 50%;
  background: linear-gradient(180deg, var(--ukraine-blue-dark) 0%, transparent 100%);
  z-index: 0;
  opacity: 0.5;
}

.ukraine-support::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 50%;
  background: linear-gradient(0deg, var(--ukraine-yellow) 0%, transparent 100%);
  z-index: 0;
  opacity: 0.1;
}

.ukraine-support p {
  margin: 0 0 0.75rem 0;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--ukraine-yellow);
  position: relative;
  z-index: 1;
  letter-spacing: 0.5px;
  line-height: 1.7;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.4);
}

.ukraine-support p:last-child {
  margin-bottom: 0;
}

/* 旗帜图标 */
.ukraine-support p:first-child::before {
  content: "🇺🇦";
  margin-right: 0.75rem;
  font-size: 1.5rem;
  vertical-align: middle;
}

/* 副标题 */
.ukraine-subtitle {
  font-size: 1.05rem !important;
  font-weight: 600 !important;
  color: var(--ukraine-yellow-light) !important;
  margin-top: 0.75rem !important;
  opacity: 0.95;
}

/* 版权信息 */
footer > p {
  margin: 1.5rem 0;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ukraine-blue);
  opacity: 0.85;
  position: relative;
  z-index: 1;
}

/* 底部导航链接 */
footer nav {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
  background: none;
  padding: 0;
  position: static;
  box-shadow: none;
  border: none;
}

footer nav a {
  color: var(--ukraine-yellow);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.6rem 1.25rem;
  background: var(--ukraine-blue);
  border: 2px solid var(--ukraine-blue-dark);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-normal);
  display: inline-block;
  position: relative;
}

footer nav a:hover {
  background: var(--ukraine-blue-dark);
  color: var(--ukraine-yellow-light);
  border-color: var(--ukraine-yellow);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* 响应式设计 */
@media (max-width: 1200px) {
  main {
    padding: 2.5rem 1.5rem;
  }

  .link-grid {
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 0.9rem;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  header {
    padding: 1rem 0.75rem;
  }

  header h1 {
    font-size: 1.5rem;
    letter-spacing: 1.5px;
  }

  nav {
    padding: 0.5rem;
  }

  nav a {
    padding: 0.4rem 0.75rem;
    font-size: 0.85rem;
  }

  main {
    padding: 1.5rem 1rem;
  }

  .category-title {
    font-size: 1.5rem;
    margin: 1.75rem 0 1rem;
    padding-left: 1rem;
  }

  .link-grid {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 0.85rem;
  }

  .link-card {
    min-height: 90px;
  }

  .link-card a {
    min-height: 90px;
    padding: 0.85rem 0.5rem;
  }

  .link-card i {
    font-size: 1.8rem;
    margin-bottom: 0.4rem;
  }

  .link-card h3 {
    font-size: 0.8rem;
  }

  footer {
    padding: 2rem 1.25rem 1.25rem;
  }

  .wanted-poster {
    max-width: 85%;
    padding: 0.85rem;
  }

  .ukraine-support {
    padding: 1.75rem 1.75rem;
  }

  .ukraine-support p {
    font-size: 1rem;
  }

  .ukraine-subtitle {
    font-size: 0.9rem !important;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  header {
    padding: 0.85rem 0.65rem;
  }

  header h1 {
    font-size: 1.35rem;
    letter-spacing: 1.25px;
  }

  nav {
    padding: 0.4rem;
  }

  nav a {
    padding: 0.35rem 0.65rem;
    font-size: 0.8rem;
  }

  main {
    padding: 1.25rem 0.75rem;
  }

  .category-title {
    font-size: 1.35rem;
    margin: 1.5rem 0 0.85rem;
    padding-left: 0.85rem;
  }

  .link-grid {
    grid-template-columns: repeat(auto-fill, minmax(85px, 1fr));
    gap: 0.7rem;
  }

  .link-card {
    min-height: 80px;
  }

  .link-card a {
    min-height: 80px;
    padding: 0.75rem 0.4rem;
  }

  .link-card i {
    font-size: 1.6rem;
    margin-bottom: 0.35rem;
  }

  .link-card h3 {
    font-size: 0.75rem;
  }

  footer {
    padding: 1.75rem 1rem 1rem;
  }

  .wanted-poster {
    max-width: 90%;
    padding: 0.75rem;
  }

  .ukraine-support {
    padding: 1.5rem 1.5rem;
  }

  .ukraine-support p {
    font-size: 0.95rem;
  }

  .ukraine-subtitle {
    font-size: 0.85rem !important;
  }

  footer nav {
    gap: 0.65rem;
  }

  footer nav a {
    padding: 0.35rem 0.65rem;
    font-size: 0.8rem;
  }
}

@media (max-width: 360px) {
  .link-grid {
    grid-template-columns: repeat(auto-fill, minmax(75px, 1fr));
    gap: 0.6rem;
  }

  .link-card {
    min-height: 75px;
  }

  .link-card a {
    min-height: 75px;
    padding: 0.6rem 0.35rem;
  }

  .link-card i {
    font-size: 1.4rem;
  }

  .link-card h3 {
    font-size: 0.7rem;
  }

  .ukraine-support {
    padding: 1.25rem 1.25rem;
  }

  .ukraine-support p {
    font-size: 0.95rem;
  }

  .ukraine-subtitle {
    font-size: 0.85rem !important;
  }
}

/* 滚动条样式 - 乌克兰主题 */
::-webkit-scrollbar {
  width: 12px;
}

::-webkit-scrollbar-track {
  background: var(--ukraine-blue-dark);
}

::-webkit-scrollbar-thumb {
  background: var(--ukraine-yellow);
  border-radius: 6px;
  border: 2px solid var(--ukraine-blue-dark);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--ukraine-yellow-light);
}

/* 选中文本样式 */
::selection {
  background: var(--ukraine-yellow);
  color: var(--ukraine-blue);
}

::-moz-selection {
  background: var(--ukraine-yellow);
  color: var(--ukraine-blue);
}