/*
  磷脂仓库：明亮科技主题样式

  设计目标：
  - 使用柔和的渐变与明亮的强调色，营造轻盈现代的高科技感。
  - 应用玻璃拟态风格的卡片，并通过微动画提升互动性，强调层次与可读性。
  - 利用动态背景和定制光标增加动感与趣味性。
  - 增加微互动，例如滚动出现动画与悬停反馈。
*/

/* 根变量定义 */
:root {
  /* 渐变背景色：淡粉、淡蓝、淡绿 */
  --gradient-start: #fbd0d0;
  --gradient-middle: #a7d8ff;
  --gradient-end: #d1ffd6;
  /* 强调色 */
  --color-primary: #0078ff;
  --color-secondary: #c14bf4;
  --color-green: #00c28b;
  --color-orange: #ff8a5b;
  --color-red: #ff487e;
  /* 文本 */
  --color-text: #1c2431;
  --color-muted: #5f6b7c;
  /* 卡片和导航背景 */
  --card-bg: rgba(255, 255, 255, 0.8);
  --card-border: rgba(0, 0, 0, 0.1);
  --nav-bg: rgba(255, 255, 255, 0.6);
  --nav-border: rgba(0, 0, 0, 0.05);
  /* 动画持续时间 */
  --duration-fast: 0.3s;
  --duration-medium: 0.6s;
  /* 自定义光标颜色 */
  --cursor-color: #00cfff;
  --cursor-border: #00aaff;
  --cursor-hover: #e351ff;
}

/* 全局初始化 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  color: var(--color-text);
  background: linear-gradient(120deg, var(--gradient-start), var(--gradient-middle), var(--gradient-end));
  background-size: 200% 200%;
  animation: gradientShift 20s ease infinite;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  cursor: none; /* 隐藏默认光标以使用自定义光标 */
}

/* 动态背景 canvas */
.bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--nav-bg);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 8px var(--nav-border);
  z-index: 100;
}
.navbar .logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-primary);
}
.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}
.nav-links li a {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  transition: color var(--duration-fast);
}
.nav-links li a.active {
  color: var(--color-primary);
}
.nav-links li a:hover {
  color: var(--color-primary);
}
/* 汉堡按钮 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
}
.hamburger span {
  width: 24px;
  height: 3px;
  background-color: var(--color-text);
  transition: transform var(--duration-fast) ease;
}
/* 移动端导航 */
.mobile-nav {
  display: none;
  flex-direction: column;
  position: fixed;
  top: 64px;
  left: 0;
  width: 100%;
  background-color: var(--nav-bg);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 8px var(--nav-border);
  z-index: 99;
}
.mobile-nav.open {
  display: flex;
}
.mobile-nav a {
  padding: 1rem 2rem;
  color: var(--color-text);
  border-bottom: 1px solid var(--nav-border);
  text-align: center;
  transition: background-color var(--duration-fast);
}
.mobile-nav a:hover {
  background-color: rgba(255, 255, 255, 0.3);
}

/* 英雄区域 */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4rem 1rem;
}
.hero-inner {
  max-width: 800px;
}
.hero-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  background-image: linear-gradient(60deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1rem;
}
.hero-description {
  font-size: 1.2rem;
  color: var(--color-muted);
  margin-bottom: 2rem;
}
.cta-button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-image: linear-gradient(45deg, var(--color-primary), var(--color-secondary));
  /* 避免纯白文本，使用略带蓝紫的浅色 */
  color: #f2f6ff;
  padding: 0.9rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 30px;
  box-shadow: 0 8px 16px rgba(0,0,0,0.15);
  transition: transform var(--duration-fast), box-shadow var(--duration-fast);
}
.cta-button:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0,0,0,0.2);
}
.cta-button i,
.cta-button svg {
  transition: transform var(--duration-fast);
}
.cta-button:hover i,
.cta-button:hover svg {
  transform: translateX(4px);
}

/* 分类板块 */
.categories {
  padding: 6rem 1rem;
  position: relative;
}
.section-title {
  text-align: center;
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: 3rem;
  background-image: linear-gradient(60deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  max-width: 1100px;
  margin: 0 auto;
}
.cat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  text-align: center;
  background-color: var(--card-bg);
  backdrop-filter: blur(6px);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 2rem 1.5rem;
  color: var(--color-text);
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  transition: transform var(--duration-fast), box-shadow var(--duration-fast);
}
.cat-card i,
.cat-card svg {
  font-size: 2.2rem;
  width: 2.2rem;
  height: 2.2rem;
  color: var(--accent);
  margin-bottom: 1rem;
  transition: transform var(--duration-medium) ease;
  flex-shrink: 0;
}
.cat-card h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}
.cat-card p {
  font-size: 0.95rem;
  color: var(--color-muted);
}
.cat-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 24px rgba(0,0,0,0.15);
}
.cat-card:hover i {
  transform: rotate(8deg) scale(1.1);
}

/* 页脚 */
.footer {
  padding: 2rem 1rem;
  text-align: center;
  background-color: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(10px);
  color: var(--color-text);
  margin-top: 4rem;
}
.footer .social {
  margin-top: 1rem;
  display: flex;
  justify-content: center;
  gap: 1.5rem;
}
.footer .social a {
  color: var(--color-text);
  font-size: 1.4rem;
  transition: color var(--duration-fast);
}
.footer .social a:hover {
  color: var(--color-primary);
}

/* 通用 Section 样式（项目、论文、足球、Kaggle、Codeforces 页） */
.section {
  padding: 5rem 1rem;
  max-width: 1100px;
  margin: 0 auto;
}
.section h2 {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  /* 使用传入的 accent 颜色渐变标题 */
  background-image: linear-gradient(60deg, var(--accent), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.section-desc {
  text-align: center;
  font-size: 1rem;
  color: var(--color-muted);
  margin-bottom: 3rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
}
.card {
  background-color: var(--card-bg);
  backdrop-filter: blur(6px);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  color: var(--color-text);
  text-decoration: none;
  transition: transform var(--duration-fast), box-shadow var(--duration-fast);
}
.card.hidden {
  /* 继承隐藏动画 */
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-medium) ease-out, transform var(--duration-medium) ease-out;
}
.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 24px rgba(0,0,0,0.15);
}
.card .icon-wrapper {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background-color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  flex-shrink: 0;
}
.card .icon-wrapper svg {
  width: 1.6rem;
  height: 1.6rem;
  fill: none;
  stroke: #f2f6ff;
  stroke-width: 1.5;
}
.card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}
.card p {
  font-size: 0.95rem;
  color: var(--color-muted);
  margin-bottom: 1rem;
  flex-grow: 1;
}
.card .link {
  display: inline-block;
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  margin-top: auto;
  transition: color var(--duration-fast);
}
.card .link:hover {
  color: var(--color-primary);
}

/* 自定义光标样式 */
.custom-cursor {
  position: fixed;
  top: 0;
  left: 0;
  width: 8px;
  height: 8px;
  background-color: var(--cursor-color);
  border-radius: 50%;
  pointer-events: none;
  z-index: 1000;
  transform: translate(-50%, -50%);
}
.cursor-follower {
  position: fixed;
  top: 0;
  left: 0;
  width: 36px;
  height: 36px;
  border: 2px solid var(--cursor-border);
  border-radius: 50%;
  pointer-events: none;
  z-index: 999;
  transform: translate(-50%, -50%);
  transition: transform var(--duration-fast) ease-out, border-color var(--duration-fast);
}
.cursor-follower.active {
  transform: translate(-50%, -50%) scale(1.5);
  border-color: var(--cursor-hover);
}

/* 出现动画：初始隐藏状态 */
.hidden {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-medium) ease-out, transform var(--duration-medium) ease-out;
}
.in-view {
  opacity: 1 !important;
  transform: translateY(0) !important;
}

/* =======================
   新增：文章系统 UI
   ======================= */

.page {
  padding-top: 96px;
  padding-bottom: 2rem;
}

.page-hero {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2.2rem 1rem 1.2rem;
  text-align: left;
}

.page-hero h1 {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: 0.2px;
  margin-bottom: 0.6rem;
  background-image: linear-gradient(60deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-hero p {
  color: var(--color-muted);
  max-width: 820px;
}

.panel {
  max-width: 1100px;
  margin: 0 auto 1.5rem;
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 28px rgba(0,0,0,0.08);
  padding: 1.25rem;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.panel-footer {
  display: flex;
  justify-content: flex-end;
  margin-top: 1rem;
}

.subtle-link {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 700;
}

.subtle-link:hover {
  text-decoration: underline;
}

.muted {
  color: var(--color-muted);
}

.loading {
  padding: 1rem;
  color: var(--color-muted);
}

.empty-state {
  padding: 1.25rem;
  color: var(--color-muted);
  text-align: center;
}

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

.post-card {
  background: rgba(255,255,255,0.72);
  border: 1px solid rgba(0,0,0,0.08);
  border-radius: 16px;
  overflow: hidden;
  text-decoration: none;
  color: var(--color-text);
  box-shadow: 0 6px 16px rgba(0,0,0,0.08);
  transform: translateY(0);
  transition: transform var(--duration-fast), box-shadow var(--duration-fast);
}

.post-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 14px 28px rgba(0,0,0,0.12);
}

.post-cover {
  width: 100%;
  height: 140px;
  background: linear-gradient(45deg, rgba(0,120,255,0.20), rgba(193,75,244,0.20));
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  position: relative;
}

.post-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.post-card-body {
  padding: 0.9rem 0.95rem 1rem;
}

.post-card-title {
  font-size: 1.06rem;
  font-weight: 800;
  margin-bottom: 0.4rem;
  line-height: 1.35;
}

.post-card-excerpt {
  font-size: 0.95rem;
  color: var(--color-muted);
  line-height: 1.5;
  min-height: 2.85em;
}

.post-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  margin-top: 0.8rem;
  flex-wrap: wrap;
}

.post-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.22rem 0.55rem;
  border-radius: 999px;
  font-weight: 800;
  font-size: 0.78rem;
  color: rgba(28, 36, 49, 0.92);
  background: rgba(0, 120, 255, 0.12);
  border: 1px solid rgba(0, 120, 255, 0.18);
}

.post-date {
  font-size: 0.85rem;
  color: var(--color-muted);
}

/* 文章页 */
.post-panel {
  padding: 1.25rem;
}

.post-toolbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  justify-content: space-between;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.post-header {
  margin-bottom: 1rem;
}

.post-meta-line {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin-bottom: 0.7rem;
}

.post-h1 {
  font-size: 2rem;
  font-weight: 900;
  margin-bottom: 0.8rem;
  letter-spacing: 0.2px;
}

.post-cover-img {
  width: 100%;
  border-radius: 16px;
  border: 1px solid rgba(0,0,0,0.08);
  box-shadow: 0 12px 24px rgba(0,0,0,0.10);
}

.post-content {
  line-height: 1.75;
  color: rgba(28, 36, 49, 0.95);
}

.post-content h2,
.post-content h3 {
  margin: 1.3rem 0 0.6rem;
}

.post-content p {
  margin: 0.7rem 0;
}

.post-content img {
  max-width: 100%;
  border-radius: 12px;
  border: 1px solid rgba(0,0,0,0.10);
}

.post-content pre {
  overflow: auto;
  padding: 0.9rem;
  border-radius: 12px;
  background: rgba(0,0,0,0.06);
  border: 1px solid rgba(0,0,0,0.10);
}

.post-content code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.92em;
}

.post-content blockquote {
  border-left: 4px solid rgba(0,120,255,0.35);
  padding: 0.2rem 0 0.2rem 0.8rem;
  margin: 1rem 0;
  color: rgba(28, 36, 49, 0.82);
  background: rgba(0,120,255,0.06);
  border-radius: 10px;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: 12px;
  margin: 1rem 0;
  border: 1px solid rgba(0,0,0,0.08);
}

.post-content th,
.post-content td {
  padding: 0.6rem 0.7rem;
  border-bottom: 1px solid rgba(0,0,0,0.08);
}

.post-content th {
  background: rgba(0,0,0,0.05);
  text-align: left;
}

/* 过滤条 */
.filter-bar {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding-top: 0.2rem;
}

.chip {
  border: 1px solid rgba(0,0,0,0.10);
  background: rgba(255,255,255,0.65);
  color: var(--color-text);
  border-radius: 999px;
  padding: 0.45rem 0.85rem;
  font-weight: 800;
  cursor: pointer;
  transition: transform var(--duration-fast), box-shadow var(--duration-fast);
}

.chip:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.08);
}

.chip.active {
  background: rgba(0,120,255,0.14);
  border-color: rgba(0,120,255,0.30);
}

/* 后台 */
.admin-panel {
  padding: 1.25rem;
}

.admin-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1rem;
}

.admin-card {
  background: rgba(255,255,255,0.72);
  border: 1px solid rgba(0,0,0,0.08);
  border-radius: 16px;
  padding: 1rem;
}

.admin-card h2 {
  margin-bottom: 0.6rem;
}

.form {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.label {
  font-weight: 800;
  color: rgba(28, 36, 49, 0.92);
}

.hint {
  font-size: 0.85rem;
  color: var(--color-muted);
}

.input {
  width: 100%;
  border: 1px solid rgba(0,0,0,0.12);
  background: rgba(255,255,255,0.70);
  border-radius: 12px;
  padding: 0.65rem 0.75rem;
  outline: none;
}

.input:focus {
  border-color: rgba(0,120,255,0.45);
  box-shadow: 0 0 0 4px rgba(0,120,255,0.12);
}

.input.small {
  padding: 0.45rem 0.55rem;
  border-radius: 10px;
  font-weight: 700;
}

.btn {
  border: 1px solid rgba(0,0,0,0.12);
  background: rgba(255,255,255,0.70);
  color: var(--color-text);
  border-radius: 12px;
  padding: 0.65rem 0.85rem;
  font-weight: 900;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  transition: transform var(--duration-fast), box-shadow var(--duration-fast);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.08);
}

.btn.primary {
  background: linear-gradient(45deg, rgba(0,120,255,0.24), rgba(193,75,244,0.20));
  border-color: rgba(0,120,255,0.28);
}

.btn.danger {
  background: rgba(255,72,126,0.14);
  border-color: rgba(255,72,126,0.28);
}

.btn.small {
  padding: 0.45rem 0.65rem;
  border-radius: 10px;
  font-weight: 800;
}

.admin-lists {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.admin-list {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.admin-item {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.85rem;
  border-radius: 14px;
  background: rgba(255,255,255,0.72);
  border: 1px solid rgba(0,0,0,0.08);
}

.admin-item-title {
  font-weight: 900;
  margin-bottom: 0.3rem;
}

.admin-item-meta {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.admin-item-actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.subhead {
  font-size: 1.1rem;
  font-weight: 900;
  margin: 0.2rem 0 0.6rem;
}

.admin-list-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.8rem;
  flex-wrap: wrap;
}

/* Footer links */
.footer-links {
  margin-top: 0.7rem;
  display: flex;
  justify-content: center;
  gap: 1rem;
}

/* Home latest panel spacing */
.home-latest {
  padding: 1.25rem;
}

@media (max-width: 900px) {
  .admin-lists {
    grid-template-columns: 1fr;
  }
}

/* 响应式：移动端显示汉堡菜单 */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .hamburger {
    display: flex;
  }
}