/* ============================================================
   NEXUS BLOG · 科幻绚丽主题
   配色：深空黑 / 霓虹青 / 品红 / 电紫
   ============================================================ */

/* ---------- 字体 ---------- */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;600;700;900&family=Rajdhani:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;600&display=swap');

/* ---------- 设计变量 ---------- */
:root {
  --bg-deep: #05070f;
  --bg-panel: rgba(13, 19, 38, 0.72);
  --bg-panel-solid: #0d1326;
  --neon-cyan: #00f0ff;
  --neon-magenta: #ff2a6d;
  --neon-purple: #b026ff;
  --neon-blue: #05d9e8;
  --neon-green: #39ff14;
  --text-primary: #d1f7ff;
  --text-dim: #6c7a9c;
  --text-faint: #3a4566;
  --border-glow: rgba(0, 240, 255, 0.35);
  --grid-line: rgba(0, 240, 255, 0.06);
  --glass-blur: 14px;
  --radius: 14px;
  --shadow-cyan: 0 0 18px rgba(0, 240, 255, 0.45);
  --shadow-magenta: 0 0 18px rgba(255, 42, 109, 0.45);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Rajdhani', 'Microsoft YaHei', sans-serif;
  background: var(--bg-deep);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  line-height: 1.65;
}

/* 星空粒子画布（固定底层） */
#starfield {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* 网格背景叠加 */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 44px 44px;
  z-index: 0;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
}

/* 扫描线全局叠加 */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent 0,
    transparent 3px,
    rgba(0, 240, 255, 0.018) 3px,
    rgba(0, 240, 255, 0.018) 4px
  );
  z-index: 9999;
  pointer-events: none;
  mix-blend-mode: overlay;
}

/* 顶部光晕渐变 */
.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.35;
  z-index: 0;
  pointer-events: none;
}
.bg-orb.cyan { top: -120px; left: -80px; width: 420px; height: 420px; background: var(--neon-cyan); }
.bg-orb.magenta { top: 20%; right: -120px; width: 380px; height: 380px; background: var(--neon-magenta); }
.bg-orb.purple { bottom: -100px; left: 30%; width: 460px; height: 460px; background: var(--neon-purple); opacity: 0.22; }

/* ---------- 布局容器 ---------- */
.wrap {
  position: relative;
  z-index: 2;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 顶部导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  background: rgba(5, 7, 15, 0.62);
  border-bottom: 1px solid var(--border-glow);
  box-shadow: 0 6px 30px rgba(0, 240, 255, 0.08);
}
.nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 66px;
}
.brand {
  font-family: 'Orbitron', sans-serif;
  font-weight: 900;
  font-size: 1.35rem;
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  position: relative;
}
.brand .dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--neon-magenta);
  box-shadow: 0 0 12px var(--neon-magenta);
  animation: pulse 1.6s ease-in-out infinite;
}
/* 品牌名容器 */
.brand .brand-text {
  display: inline-flex;
  align-items: center;
  filter: drop-shadow(0 0 10px rgba(0, 240, 255, 0.55)) drop-shadow(0 0 18px rgba(176, 38, 255, 0.35));
  animation: brandGlow 2.4s ease-in-out infinite;
}
/* 逐字：每个字符自带流光渐变 + 闪烁 */
.brand .brand-text .ch {
  display: inline-block;
  background: linear-gradient(
    90deg,
    var(--neon-cyan) 0%,
    var(--neon-purple) 35%,
    var(--neon-magenta) 65%,
    var(--neon-cyan) 100%
  );
  background-size: 300% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  animation: brandFlow 4s linear infinite, charFlicker 3s ease-in-out infinite;
}
.brand .brand-text .ch:nth-child(1) { animation-delay: 0s, 0s; }
.brand .brand-text .ch:nth-child(2) { animation-delay: 0s, 0.1s; }
.brand .brand-text .ch:nth-child(3) { animation-delay: 0s, 0.2s; }
.brand .brand-text .ch:nth-child(4) { animation-delay: 0s, 0.3s; }
.brand .brand-text .ch:nth-child(5) { animation-delay: 0s, 0.4s; }
.brand .brand-text .ch:nth-child(6) { animation-delay: 0s, 0.5s; }
.brand .brand-text .ch:nth-child(7) { animation-delay: 0s, 0.6s; }
.brand .brand-text .ch:nth-child(8) { animation-delay: 0s, 0.7s; }
.brand .brand-text .ch:nth-child(9) { animation-delay: 0s, 0.8s; }
.brand .brand-text .ch:nth-child(10) { animation-delay: 0s, 0.9s; }
.brand .brand-text .ch:nth-child(11) { animation-delay: 0s, 1.0s; }
@keyframes brandFlow {
  0% { background-position: 0% 50%; }
  100% { background-position: 300% 50%; }
}
@keyframes brandGlow {
  0%, 100% {
    filter: drop-shadow(0 0 8px rgba(0, 240, 255, 0.5)) drop-shadow(0 0 14px rgba(176, 38, 255, 0.3));
  }
  50% {
    filter: drop-shadow(0 0 14px rgba(0, 240, 255, 0.85)) drop-shadow(0 0 24px rgba(255, 42, 109, 0.5));
  }
}
@keyframes charFlicker {
  0%, 100% { opacity: 1; transform: translateY(0); }
  3% { opacity: 0.4; transform: translateY(-1px); }
  6% { opacity: 1; transform: translateY(0); }
  50% { opacity: 1; }
  52% { opacity: 0.6; }
  54% { opacity: 1; }
}
.brand span { color: var(--text-primary); }
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.5; }
}
.nav-links { display: flex; gap: 6px; align-items: center; }
.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 8px 16px;
  border-radius: 8px;
  transition: all 0.25s;
  position: relative;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--neon-cyan);
  text-shadow: 0 0 10px rgba(0, 240, 255, 0.6);
}
.nav-links a::after {
  content: '';
  position: absolute;
  left: 50%; bottom: 2px;
  width: 0; height: 2px;
  background: var(--neon-cyan);
  box-shadow: 0 0 8px var(--neon-cyan);
  transition: all 0.25s;
  transform: translateX(-50%);
}
.nav-links a:hover::after, .nav-links a.active::after { width: 60%; }

/* ---------- HERO 区 ---------- */
.hero {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 110px 24px 60px;
}
.hero .tag {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--neon-cyan);
  letter-spacing: 3px;
  padding: 6px 18px;
  border: 1px solid var(--border-glow);
  border-radius: 30px;
  background: rgba(0, 240, 255, 0.05);
  margin-bottom: 28px;
}
.hero h1 {
  font-family: 'Orbitron', sans-serif;
  font-weight: 900;
  font-size: clamp(2.4rem, 6vw, 4.6rem);
  line-height: 1.05;
  letter-spacing: 2px;
  margin-bottom: 18px;
}
.hero h1 .grad {
  background: linear-gradient(120deg, var(--neon-cyan), var(--neon-purple), var(--neon-magenta));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 18px rgba(0, 240, 255, 0.4));
}
.hero p {
  color: var(--text-dim);
  font-size: 1.15rem;
  max-width: 580px;
  margin: 0 auto 34px;
  font-weight: 400;
}
.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ---------- 按钮 ---------- */
.btn {
  font-family: 'Rajdhani', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 12px 30px;
  border-radius: 10px;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.28s;
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}
.btn-primary {
  color: #05070f;
  background: linear-gradient(120deg, var(--neon-cyan), var(--neon-blue));
  box-shadow: var(--shadow-cyan);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 28px rgba(0, 240, 255, 0.75);
}
.btn-ghost {
  color: var(--neon-cyan);
  border-color: var(--border-glow);
  background: rgba(0, 240, 255, 0.04);
}
.btn-ghost:hover {
  background: rgba(0, 240, 255, 0.12);
  box-shadow: var(--shadow-cyan);
  border-color: var(--neon-cyan);
}
.btn-danger {
  color: var(--neon-magenta);
  border-color: rgba(255, 42, 109, 0.4);
  background: rgba(255, 42, 109, 0.06);
}
.btn-danger:hover {
  background: rgba(255, 42, 109, 0.18);
  box-shadow: var(--shadow-magenta);
}

/* ---------- 区块标题 ---------- */
.section-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 70px 0 34px;
}
.section-head .bar {
  width: 4px; height: 30px;
  background: linear-gradient(var(--neon-cyan), var(--neon-magenta));
  border-radius: 4px;
  box-shadow: 0 0 12px var(--neon-cyan);
}
.section-head h2 {
  font-family: 'Orbitron', sans-serif;
  font-weight: 700;
  font-size: 1.6rem;
  letter-spacing: 2px;
}
.section-head .count {
  margin-left: auto;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-faint);
  font-size: 0.85rem;
}

/* ---------- 文章卡片网格 ---------- */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 22px;
  padding-bottom: 70px;
}
.post-card {
  position: relative;
  background: var(--bg-panel);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid rgba(0, 240, 255, 0.15);
  border-radius: var(--radius);
  padding: 26px 24px;
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  transition: all 0.32s cubic-bezier(0.2, 0.8, 0.2, 1);
  display: flex;
  flex-direction: column;
  min-height: 220px;
}
/* 卡片角标装饰 */
.post-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--neon-cyan), var(--neon-magenta));
  opacity: 0;
  transition: opacity 0.3s;
}
.post-card::after {
  content: '';
  position: absolute;
  top: 12px; right: 12px;
  width: 8px; height: 8px;
  border-top: 2px solid var(--neon-cyan);
  border-right: 2px solid var(--neon-cyan);
  opacity: 0.5;
}
.post-card:hover {
  transform: translateY(-6px);
  border-color: var(--neon-cyan);
  box-shadow: 0 12px 40px rgba(0, 240, 255, 0.18), inset 0 0 30px rgba(0, 240, 255, 0.04);
}
.post-card:hover::before { opacity: 1; }

.post-card .pcat {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--neon-magenta);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.post-card h3 {
  font-family: 'Orbitron', sans-serif;
  font-weight: 600;
  font-size: 1.18rem;
  line-height: 1.35;
  margin-bottom: 12px;
  color: var(--text-primary);
  transition: color 0.3s;
}
.post-card:hover h3 { color: var(--neon-cyan); }
.post-card .excerpt {
  color: var(--text-dim);
  font-size: 0.95rem;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.post-card .pmeta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid rgba(0, 240, 255, 0.1);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--text-faint);
}
.post-card .pmeta .read {
  margin-left: auto;
  color: var(--neon-cyan);
}

/* ---------- 文章详情页 ---------- */
.article-view { padding: 50px 0 80px; }
.article-head { margin-bottom: 40px; }
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-dim);
  text-decoration: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  margin-bottom: 28px;
  transition: color 0.25s;
}
.back-link:hover { color: var(--neon-cyan); }
.article-head .cat {
  font-family: 'JetBrains Mono', monospace;
  color: var(--neon-magenta);
  letter-spacing: 2px;
  text-transform: uppercase;
  font-size: 0.8rem;
}
.article-head h1 {
  font-family: 'Orbitron', sans-serif;
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1.2;
  margin: 14px 0 20px;
  text-shadow: 0 0 24px rgba(0, 240, 255, 0.25);
}
.article-head .meta {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  color: var(--text-faint);
}
.article-head .meta span { display: inline-flex; align-items: center; gap: 6px; }

.article-body {
  background: var(--bg-panel);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid rgba(0, 240, 255, 0.12);
  border-radius: var(--radius);
  padding: 44px 48px;
  position: relative;
}
.article-body::before {
  content: '';
  position: absolute;
  top: 0; left: 0; width: 4px; height: 100%;
  background: linear-gradient(var(--neon-cyan), var(--neon-purple), var(--neon-magenta));
  border-radius: 4px 0 0 4px;
  opacity: 0.6;
}

/* ---------- Markdown 正文排版 ---------- */
.md { font-size: 1.06rem; line-height: 1.85; color: var(--text-primary); }
.md h1, .md h2, .md h3, .md h4 {
  font-family: 'Orbitron', sans-serif;
  color: var(--neon-cyan);
  margin: 1.6em 0 0.7em;
  line-height: 1.3;
}
.md h1 { font-size: 1.7rem; }
.md h2 {
  font-size: 1.4rem;
  padding-bottom: 0.3em;
  border-bottom: 1px solid rgba(0, 240, 255, 0.2);
}
.md h3 { font-size: 1.2rem; color: var(--text-primary); }
.md p { margin: 0 0 1.2em; }
.md a { color: var(--neon-cyan); text-decoration: none; border-bottom: 1px dashed rgba(0,240,255,0.4); }
.md a:hover { text-shadow: 0 0 8px rgba(0,240,255,0.6); }
.md ul, .md ol { margin: 0 0 1.2em 1.4em; }
.md li { margin-bottom: 0.5em; }
.md code {
  font-family: 'JetBrains Mono', monospace;
  background: rgba(0, 240, 255, 0.1);
  color: var(--neon-cyan);
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 0.9em;
}
.md pre {
  background: rgba(2, 4, 12, 0.9);
  border: 1px solid rgba(0, 240, 255, 0.2);
  border-radius: 8px;
  padding: 18px 20px;
  overflow-x: auto;
  margin: 0 0 1.3em;
  position: relative;
}
.md pre::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--neon-cyan), transparent);
  opacity: 0.5;
}
.md pre code { background: none; color: #a8e6ff; padding: 0; font-size: 0.88rem; }
.md blockquote {
  border-left: 3px solid var(--neon-magenta);
  background: rgba(255, 42, 109, 0.06);
  padding: 14px 22px;
  margin: 0 0 1.3em;
  border-radius: 0 8px 8px 0;
  color: var(--text-dim);
  font-style: italic;
}
.md img { max-width: 100%; border-radius: 8px; border: 1px solid rgba(0,240,255,0.2); }
.md table { width: 100%; border-collapse: collapse; margin: 0 0 1.3em; }
.md th, .md td { border: 1px solid rgba(0,240,255,0.2); padding: 10px 14px; text-align: left; }
.md th { background: rgba(0,240,255,0.08); color: var(--neon-cyan); font-family: 'Orbitron',sans-serif; font-size: 0.9rem; }
.md hr { border: none; border-top: 1px solid rgba(0,240,255,0.2); margin: 2em 0; }

/* ---------- 页脚 ---------- */
.footer {
  position: relative;
  z-index: 2;
  border-top: 1px solid var(--border-glow);
  background: rgba(5, 7, 15, 0.7);
  backdrop-filter: blur(var(--glass-blur));
  padding: 36px 0;
  text-align: center;
  color: var(--text-faint);
  font-size: 0.88rem;
}
.footer .brand-mini {
  font-family: 'Orbitron', sans-serif;
  color: var(--neon-cyan);
  letter-spacing: 2px;
  margin-bottom: 8px;
}
.footer a { color: var(--text-dim); text-decoration: none; }
.footer a:hover { color: var(--neon-cyan); }

/* ---------- 加载与状态 ---------- */
.loader {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 80px 0;
  gap: 10px;
}
.loader .ld {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--neon-cyan);
  box-shadow: 0 0 10px var(--neon-cyan);
  animation: bounce 1.2s infinite ease-in-out;
}
.loader .ld:nth-child(2) { animation-delay: 0.2s; background: var(--neon-purple); box-shadow: 0 0 10px var(--neon-purple); }
.loader .ld:nth-child(3) { animation-delay: 0.4s; background: var(--neon-magenta); box-shadow: 0 0 10px var(--neon-magenta); }
@keyframes bounce {
  0%, 80%, 100% { transform: scale(0.4); opacity: 0.5; }
  40% { transform: scale(1); opacity: 1; }
}
.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-faint);
}
.empty-state .ico { font-size: 3rem; margin-bottom: 16px; opacity: 0.4; }

/* ---------- Toast 提示 ---------- */
.toast {
  position: fixed;
  bottom: 30px; left: 50%;
  transform: translateX(-50%) translateY(120px);
  background: var(--bg-panel-solid);
  border: 1px solid var(--neon-cyan);
  border-radius: 10px;
  padding: 14px 26px;
  color: var(--neon-cyan);
  font-weight: 600;
  z-index: 10000;
  box-shadow: var(--shadow-cyan);
  transition: transform 0.4s cubic-bezier(0.2,0.8,0.2,1);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
}
.toast.show { transform: translateX(-50%) translateY(0); }
.toast.err { border-color: var(--neon-magenta); color: var(--neon-magenta); box-shadow: var(--shadow-magenta); }

/* ---------- 滚动条 ---------- */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--neon-cyan), var(--neon-purple));
  border-radius: 10px;
  border: 2px solid var(--bg-deep);
}
::-webkit-scrollbar-thumb:hover { background: var(--neon-cyan); }
::selection { background: rgba(0, 240, 255, 0.3); color: #fff; }

/* ---------- 淡入动画 ---------- */
.fade-in { animation: fadeIn 0.7s ease both; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 响应式 ---------- */
@media (max-width: 640px) {
  .nav .wrap { height: 58px; }
  .brand { font-size: 1.1rem; }
  .nav-links a { padding: 6px 10px; font-size: 0.82rem; }
  .hero { padding: 70px 18px 40px; }
  .article-body { padding: 26px 20px; }
  .posts-grid { grid-template-columns: 1fr; }
  .section-head { margin: 44px 0 24px; }
  .section-head h2 { font-size: 1.3rem; }
}