@import url('variables.css');

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI Variable", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(145deg, var(--bg-start) 0%, var(--bg-end) 100%);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  transition: background .3s ease, color .3s ease;
  overflow-y: scroll;
  -webkit-font-smoothing: antialiased;
}

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: rgba(0, 0, 0, 0.05); }
::-webkit-scrollbar-thumb { background: rgba(0, 0, 0, 0.2); border-radius: 4px; }
[data-theme="dark"] ::-webkit-scrollbar-track { background: rgba(255, 255, 255, 0.05); }
[data-theme="dark"] ::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.25); }

/* 头部 */
header {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 1rem;
  text-align: center;
}

header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text);
  margin-bottom: 0.5rem;
}

/* 主题切换和返回顶部按钮 */
#theme-toggle,
#back-to-top {
  position: fixed;
  z-index: 100;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  line-height: 1;
  border-radius: 50%;
  color: var(--btn-icon);
  background: var(--btn-bg);
  cursor: pointer;
  box-shadow: var(--btn-shadow);
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
  font-family: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", sans-serif;
  border: 1px solid var(--card-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

#theme-toggle { right: 1.5rem; top: 1.5rem; }

#back-to-top {
  right: 1.5rem;
  bottom: 1.5rem;
  opacity: 0;
  visibility: hidden;
}
#back-to-top.visible { opacity: 1; visibility: visible; }

#theme-toggle:hover,
#back-to-top:hover {
  background: var(--btn-bg-hover);
  box-shadow: var(--btn-shadow-hover);
}

/* 搜索容器 */
.search-container {
  max-width: 600px;
  margin: 0 auto 1rem;
  position: relative;
  display: flex;
  flex-direction: column;
}

.search-box {
  display: grid;
  grid-template-columns: auto 1fr auto;
  max-width: 480px;
  margin: 0 auto 1rem;
  box-shadow: var(--card-shadow);
  border-radius: 12px;
  overflow: hidden;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  height: 44px;
  align-items: center;
}

.search-box:hover { border-color: var(--accent-border); }
.search-box:focus-within { border-color: var(--accent); box-shadow: var(--card-shadow-hover); }

.search-engine-trigger {
  background: transparent;
  border: none;
  border-radius: 12px 0 0 12px;
  padding: 0 8px;
  min-width: 50px;
  height: 44px;
  cursor: pointer;
  outline: none;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  grid-column: 1;
}
.search-engine-trigger:hover { background: rgba(15, 23, 42, 0.06); }
[data-theme="dark"] .search-engine-trigger:hover { background: rgba(148, 163, 184, 0.1); }

.search-engine-trigger-icon {
  width: 20px;
  height: 20px;
  display: block;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  border-radius: 3px;
}
.search-engine-trigger-caret { color: var(--subtext); flex-shrink: 0; }

.search-input-area {
  position: relative;
  display: flex;
  align-items: center;
  height: 44px;
  min-width: 0;
  grid-column: 2;
}

.search-input {
  width: 100%;
  padding: 0 16px;
  padding-right: 44px;
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 15px;
  outline: none;
  height: 44px;
}
.search-input::placeholder { color: rgba(71, 85, 105, 0.55); font-size: 13px; }
[data-theme="dark"] .search-input::placeholder { color: rgba(156, 163, 175, 0.55); }

.search-clear {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  color: var(--subtext);
  cursor: pointer;
  padding: 0;
  width: 24px;
  height: 24px;
  display: none;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}
.search-clear.visible { display: flex; }
.search-clear:hover { color: var(--text); }

.search-button {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--subtext);
  display: flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  width: 40px;
  grid-column: 3;
}
.search-button:hover { color: var(--text); }
.search-button:active { color: var(--link); }
.search-button svg { width: 20px; height: 20px; }

/* 搜索引擎下拉 */
.search-engine-dropdown {
  position: absolute;
  top: 52px;
  left: 50%;
  transform: translateX(-50%);
  background: #fff;
  border: 1px solid var(--accent-border);
  border-radius: 14px;
  box-shadow: var(--card-shadow-hover);
  z-index: 200;
  overflow: hidden;
  padding: 10px 6px;
}
[data-theme="dark"] .search-engine-dropdown {
  background: var(--card-bg);
}

.search-engine-dropdown[hidden] { display: none; }

.search-engine-list {
  display: flex;
  flex-direction: row;
  gap: 4px;
}

.search-engine-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  border: none;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  border-radius: 10px;
  transition: background .15s;
  font-family: inherit;
  white-space: nowrap;
  min-width: 64px;
}
.search-engine-item:hover { background: rgba(0, 0, 0, 0.05); }
[data-theme="dark"] .search-engine-item:hover { background: rgba(255, 255, 255, 0.08); }
.search-engine-item.active {
  background: #f0f1f3;
  font-weight: 600;
}
[data-theme="dark"] .search-engine-item.active {
  background: rgba(165, 180, 252, 0.12);
}

.search-engine-item-icon {
  width: 24px;
  height: 24px;
  display: block;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  border-radius: 4px;
  flex-shrink: 0;
}

.search-engine-item-name {
  font-size: 0.72rem;
  color: var(--subtext);
  line-height: 1.2;
}
.search-engine-item.active .search-engine-item-name {
  color: var(--text);
  font-weight: 600;
}

.search-results-count {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--subtext);
  text-align: right;
  padding: 0 0.5rem;
  display: none;
}
.search-results-count.visible { display: block; }

/* 主内容 */
main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.5rem 2rem;
  min-height: 300px;
}

/* 分类区块 */
section {
  margin: 1.5rem 0;
}

section h2 {
  font-size: 1.1rem;
  font-weight: 600;
  padding-bottom: 0.8rem;
  margin-bottom: 1.2rem;
  border-bottom: 1px solid var(--card-border);
  color: var(--subtext);
  display: flex;
  align-items: center;
  letter-spacing: -0.2px;
}

/* 链接网格 */
#nav-container ul,
section ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.72rem;
  padding: 0;
  margin: 0;
}

#nav-container li,
section li {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 0.7rem 0.9rem;
  box-shadow: var(--card-shadow);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

#nav-container li:hover,
section li:hover {
  box-shadow: var(--card-shadow-hover);
  border-color: var(--accent);
  z-index: 5;
}

#nav-container li a,
section li a {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  display: flex;
  align-items: center;
  transition: color 0.2s ease;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

#nav-container li a:hover,
section li a:hover {
  color: var(--link-hover);
}

.favicon-container {
  width: 24px;
  height: 16px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

.favicon {
  width: 16px;
  height: 16px;
  border-radius: 2px;
  display: block;
}

.card-title {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.link-text {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.url {
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: var(--subtext);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.4;
  opacity: 0.8;
}

/* 悬浮气泡提示 */
.nav-tooltip {
  position: fixed;
  background: var(--card-bg);
  color: var(--text);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
  font-size: 0.8rem;
  line-height: 1.5;
  white-space: normal;
  word-break: break-all;
  max-width: 320px;
  min-width: 100px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  z-index: 9999;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s;
}
.nav-tooltip.show { opacity: 1; }
.nav-tooltip::before {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 7px solid transparent;
  border-top-color: var(--card-border);
}
.nav-tooltip::after {
  content: '';
  position: absolute;
  top: calc(100% - 1px);
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--card-bg);
}

/* 空状态 */
.empty-nav {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--subtext);
}
.empty-nav .icon { font-size: 2.5rem; margin-bottom: 0.75rem; }
.empty-nav p { font-size: 0.95rem; margin-bottom: 1rem; }
.empty-nav a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 1rem;
  font-size: 0.82rem;
  font-weight: 500;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  background: var(--btn-bg);
  color: var(--text);
  text-decoration: none;
  transition: all .15s;
}
.empty-nav a:hover { background: var(--btn-bg-hover); }

/* 页脚 */
footer {
  text-align: center;
  padding: 2rem 1.5rem 2.5rem;
  color: var(--subtext);
  border-top: 1px solid var(--card-border);
  margin-top: 2rem;
}
.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  margin-bottom: 0.85rem;
  flex-wrap: wrap;
}
.footer-nav a {
  color: var(--subtext);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  transition: color 0.2s, background 0.2s;
}
.footer-nav a:hover {
  color: var(--link);
  background: rgba(79, 70, 229, 0.06);
}
[data-theme="dark"] .footer-nav a:hover {
  background: rgba(165, 180, 252, 0.08);
}
.footer-sep {
  color: var(--card-border);
  font-size: 0.75rem;
  user-select: none;
}
.footer-copyright {
  font-size: 0.78rem;
  color: var(--subtext);
  opacity: 0.7;
  margin-bottom: 0.3rem;
}
.footer-text {
  font-size: 0.72rem;
  color: var(--subtext);
  opacity: 0.45;
}

/* 响应式 */
@media (max-width: 1199px) {
  #nav-container ul, section ul { grid-template-columns: repeat(5, 1fr); }
}
@media (max-width: 899px) {
  #nav-container ul, section ul { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 767px) {
  #nav-container ul, section ul { grid-template-columns: repeat(3, 1fr); }
  header h1 { font-size: 1.5rem; }
}
@media (max-width: 480px) {
  #nav-container ul, section ul { grid-template-columns: repeat(2, 1fr); }
  header { padding: 1.5rem 1rem 0.5rem; }
  main { padding: 0 0.5rem 1rem; }
}
@media (max-width: 280px) {
  #nav-container ul, section ul { grid-template-columns: 1fr; }
}