@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* =========================================
   基础变量
   ========================================= */
:root {
  --c-primary: #99ffcc;
  --c-accent: #00ff41;
  --c-dark: #001e3c;
  --c-dark-mid: #002a52;
  --c-dark-light: #003566;
  --c-text: #c8f0e0;
  --c-text-dim: #6baaa0;
  --c-border: rgba(153,255,204,0.18);
  --c-card-bg: rgba(0,42,82,0.72);
  --c-card-line: #00ff41;
  --font-body: 'IBM Plex Sans', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Mono', 'Courier New', monospace;
  --radius: 4px;
  --nav-h: 60px;
  --max-w: 1100px;
  --aside-w: 220px;
  --gap: 2rem;
}

/* =========================================
   重置与基础
   ========================================= */
*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  background: var(--c-dark);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

a {
  color: var(--c-primary);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover { color: var(--c-accent); }

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

ul, ol { list-style: none; }

h1,h2,h3,h4,h5,h6 {
  font-family: var(--font-mono);
  font-weight: 700;
  line-height: 1.25;
  color: var(--c-primary);
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(1.8rem, 5vw, 3rem); }
h2 { font-size: clamp(1.3rem, 3vw, 1.9rem); }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.4rem); }

p { margin-bottom: 1rem; }

hr {
  border: none;
  border-top: 1px solid var(--c-accent);
  opacity: 0.4;
  margin: 1.2rem 0 1.6rem;
}

code, pre {
  font-family: var(--font-mono);
  background: rgba(0,255,65,0.07);
  border-radius: var(--radius);
}
code { padding: 0.1em 0.4em; font-size: 0.9em; }
pre { padding: 1rem; overflow-x: auto; }

/* =========================================
   生物背景有机斑块
   ========================================= */
.bio-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}
.bio-bg--subtle .bio-blob { opacity: 0.25; }

.bio-blob {
  position: absolute;
  border-radius: 60% 40% 55% 45% / 50% 60% 40% 50%;
  filter: blur(60px);
  opacity: 0.35;
  animation: breathe 8s ease-in-out infinite;
}
.bio-blob--1 {
  width: 480px; height: 380px;
  background: radial-gradient(ellipse, #00ff4122 0%, transparent 70%);
  top: -100px; left: -120px;
  animation-duration: 9s;
}
.bio-blob--2 {
  width: 560px; height: 420px;
  background: radial-gradient(ellipse, #99ffcc18 0%, transparent 70%);
  bottom: 80px; right: -160px;
  animation-duration: 11s;
  animation-delay: -3s;
}
.bio-blob--3 {
  width: 320px; height: 300px;
  background: radial-gradient(ellipse, #00ff4114 0%, transparent 70%);
  top: 45%; left: 40%;
  animation-duration: 13s;
  animation-delay: -6s;
}

@keyframes breathe {
  0%,100% { transform: scale(1) rotate(0deg); }
  33%      { transform: scale(1.08) rotate(3deg); }
  66%      { transform: scale(0.94) rotate(-2deg); }
}

@media (prefers-reduced-motion: reduce) {
  .bio-blob { animation: none; }
}

/* =========================================
   顶部导航
   ========================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(0,30,60,0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  position: relative;
}

.brand-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  color: var(--c-accent);
}

.brand-icon {
  font-size: 1.5rem;
  color: var(--c-accent);
  font-family: var(--font-mono);
}

.main-nav {
  flex: 1;
}

.main-nav dl {
  display: flex;
  align-items: center;
  gap: 0;
  flex-wrap: wrap;
}

.nav-brand-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--c-text-dim);
  letter-spacing: 0.08em;
  padding: 0 1rem;
  white-space: nowrap;
}

.main-nav dd {
  display: block;
}

.main-nav dd a {
  display: flex;
  align-items: center;
  height: var(--nav-h);
  padding: 0 0.9rem;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--c-text);
  letter-spacing: 0.02em;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
  white-space: nowrap;
}
.main-nav dd a:hover {
  color: var(--c-primary);
  border-bottom-color: var(--c-accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  margin-left: auto;
  min-height: 44px;
  min-width: 44px;
  justify-content: center;
  align-items: center;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--c-primary);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =========================================
   英雄区 (首页)
   ========================================= */
.hero {
  position: relative;
  z-index: 1;
  min-height: calc(100vh - var(--nav-h));
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 4rem 1.5rem;
}

.hero-deco-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-mono);
  font-size: clamp(6rem, 20vw, 18rem);
  font-weight: 700;
  color: rgba(153,255,204,0.04);
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
  letter-spacing: 0.1em;
}

.hero-collage {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero-img {
  position: absolute;
  object-fit: cover;
  border-radius: var(--radius);
  opacity: 0.18;
}
.hero-img:first-child {
  width: 340px; height: 260px;
  top: 8%; right: 5%;
  transform: rotate(2deg);
}
.hero-img--offset {
  width: 240px; height: 180px;
  bottom: 12%; right: 22%;
  transform: rotate(-3deg);
  opacity: 0.1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 680px;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--c-accent);
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero-content h1 {
  margin-bottom: 1.2rem;
  text-shadow: 0 0 40px rgba(0,255,65,0.3);
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--c-text-dim);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  height: 48px;
  padding: 0 2rem;
  background: var(--c-accent);
  color: var(--c-dark);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: var(--radius);
  letter-spacing: 0.04em;
  transition: background 0.2s, transform 0.2s;
}
.btn-primary:hover {
  background: var(--c-primary);
  color: var(--c-dark);
  transform: translateY(-2px);
}

/* =========================================
   专题 Hero / 页面 Banner
   ========================================= */
.topic-hero {
  position: relative;
  z-index: 1;
  padding: 5rem 1.5rem 3.5rem;
  background: linear-gradient(180deg, rgba(0,53,102,0.4) 0%, transparent 100%);
  text-align: center;
}
.topic-hero-inner { max-width: var(--max-w); margin: 0 auto; }
.topic-hero h1 { margin-bottom: 0.8rem; }
.topic-hero-desc {
  font-size: 1.05rem;
  color: var(--c-text-dim);
  max-width: 600px;
  margin: 0 auto;
}

.page-banner {
  position: relative;
  z-index: 1;
  padding: 4rem 1.5rem 3rem;
  text-align: center;
}
.page-banner--sm { padding: 3rem 1.5rem 2rem; }
.page-banner-inner { max-width: var(--max-w); margin: 0 auto; }
.page-banner h1 { margin-bottom: 0.5rem; }

/* =========================================
   粘性锚点条
   ========================================= */
.sticky-anchor {
  position: sticky;
  top: var(--nav-h);
  z-index: 90;
  background: rgba(0,30,60,0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-border);
}
.sticky-anchor-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0.6rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-size: 0.82rem;
  font-family: var(--font-mono);
  overflow-x: auto;
  white-space: nowrap;
}
.anchor-parent { color: var(--c-text-dim); }
.anchor-parent:hover { color: var(--c-primary); }
.anchor-sep { color: var(--c-border); }
.anchor-current { color: var(--c-primary); }

/* =========================================
   主内容布局
   ========================================= */
main {
  position: relative;
  z-index: 1;
  padding: 2rem 0 4rem;
}

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.content-layout {
  display: flex;
  gap: var(--gap);
  align-items: flex-start;
}

/* aside 在左侧 */
.sidebar {
  flex: 0 0 var(--aside-w);
  position: sticky;
  top: calc(var(--nav-h) + 1rem);
}

.sidebar-inner {
  background: var(--c-card-bg);
  border: 1px solid var(--c-border);
  border-bottom: 3px solid var(--c-card-line);
  border-radius: var(--radius);
  padding: 1.2rem;
  backdrop-filter: blur(8px);
}

.sidebar-title {
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  margin-bottom: 0.6rem;
}
.sidebar-title a { color: var(--c-primary); }
.sidebar-title a:hover { color: var(--c-accent); }

.sidebar nav dl { display: flex; flex-direction: column; gap: 0; }
.sidebar nav dt {
  font-size: 0.72rem;
  color: var(--c-text-dim);
  letter-spacing: 0.1em;
  padding: 0.4rem 0 0.2rem;
}
.sidebar nav dd a {
  display: block;
  padding: 0.4rem 0;
  font-size: 0.83rem;
  color: var(--c-text-dim);
  border-bottom: 1px solid var(--c-border);
  transition: color 0.2s, padding-left 0.2s;
  min-height: 40px;
  display: flex;
  align-items: center;
}
.sidebar nav dd a:hover {
  color: var(--c-primary);
  padding-left: 0.4rem;
}

.main-content {
  flex: 1;
  min-width: 0;
}

/* =========================================
   文章正文
   ========================================= */
.article-hero {
  margin-bottom: 1.5rem;
  border-radius: var(--radius);
  overflow: hidden;
}
.article-hero-img {
  width: 100%;
  max-height: 360px;
  object-fit: cover;
}

.article-header {
  margin-bottom: 1.2rem;
}
.article-h1 { margin-bottom: 0.6rem; }

.article-meta {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
}
.article-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--c-text-dim);
  letter-spacing: 0.04em;
}

/* =========================================
   页面正文样式
   ========================================= */
.page-content {
  font-size: 1rem;
  line-height: 1.8;
}
.page-content h2 { margin: 2rem 0 0.4rem; }
.page-content h3 { margin: 1.5rem 0 0.4rem; }
.page-content p { margin-bottom: 1rem; }
.page-content ul, .page-content ol {
  padding-left: 1.4rem;
  margin-bottom: 1rem;
}
.page-content ul { list-style: disc; }
.page-content ol { list-style: decimal; }
.page-content li { margin-bottom: 0.4rem; }
.page-content blockquote {
  border-left: 3px solid var(--c-accent);
  padding: 0.6rem 1rem;
  margin: 1rem 0;
  background: rgba(0,255,65,0.04);
  color: var(--c-text-dim);
}
.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.9rem;
}
.page-content th {
  background: rgba(0,255,65,0.1);
  color: var(--c-primary);
  padding: 0.5rem 0.8rem;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}
.page-content td {
  padding: 0.45rem 0.8rem;
  border-bottom: 1px solid var(--c-border);
}

/* 歌词专用 */
.lyric-content pre,
.lyric-content .lyric-block {
  font-family: var(--font-mono);
  background: rgba(0,42,82,0.6);
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-accent);
  border-radius: var(--radius);
  padding: 1.2rem 1.4rem;
  margin: 1.2rem 0;
  white-space: pre-wrap;
  line-height: 2;
  font-size: 0.95rem;
  color: var(--c-primary);
}

/* =========================================
   卡片网格
   ========================================= */
.section-heading { margin-bottom: 0.4rem; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.2rem;
  margin-top: 1rem;
}

.child-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.2rem 1.2rem 1.4rem;
  background: var(--c-card-bg);
  border: 1px solid var(--c-border);
  border-bottom: 3px solid var(--c-card-line);
  border-radius: var(--radius);
  backdrop-filter: blur(6px);
  color: var(--c-text);
  transition: transform 0.22s, border-color 0.22s;
}
.child-card:hover {
  transform: translateY(-3px);
  border-bottom-color: var(--c-primary);
  color: var(--c-text);
}
.child-card strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: var(--c-primary);
  line-height: 1.4;
}
.card-desc {
  font-size: 0.82rem;
  color: var(--c-text-dim);
  line-height: 1.5;
  flex: 1;
}
.card-date {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-text-dim);
  letter-spacing: 0.04em;
}

/* =========================================
   专题胶囊
   ========================================= */
.topic-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1rem;
}

.topic-pill {
  display: flex;
  align-items: center;
  padding: 0.5rem 1.2rem;
  background: rgba(0,42,82,0.7);
  border: 1px solid var(--c-border);
  border-bottom: 3px solid var(--c-accent);
  border-radius: var(--radius);
  min-height: 44px;
  transition: background 0.2s, transform 0.2s;
}
.topic-pill:hover {
  background: rgba(0,53,102,0.9);
  transform: translateY(-2px);
}
.topic-pill strong {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--c-primary);
}

/* =========================================
   首页分区
   ========================================= */
.home-content-section,
.topics-section,
.cards-section {
  position: relative;
  z-index: 1;
  margin-bottom: 3.5rem;
}

.home-intro .page-content { max-width: 720px; }

/* =========================================
   Scroll Reveal 动效
   ========================================= */
.reveal-item {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease calc(var(--i, 0) * 0.08s),
              transform 0.5s ease calc(var(--i, 0) * 0.08s);
}
.reveal-item.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-section {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.reveal-section.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal-item, .reveal-section {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* =========================================
   页脚
   ========================================= */
.site-footer {
  position: relative;
  z-index: 1;
  background: rgba(0,20,40,0.95);
  border-top: 1px solid var(--c-border);
  margin-top: 2rem;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 3rem 1.5rem 2rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
}

.footer-logo-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.8rem;
}
.footer-brand-name {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--c-primary);
  letter-spacing: 0.04em;
}
.footer-desc {
  font-size: 0.85rem;
  color: var(--c-text-dim);
  line-height: 1.6;
  margin-bottom: 1.2rem;
}

.footer-form-label {
  display: block;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--c-text-dim);
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
}
.footer-form-row {
  display: flex;
  gap: 0.5rem;
}
.footer-form-row input {
  flex: 1;
  background: rgba(0,42,82,0.8);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 0 0.9rem;
  height: 40px;
  color: var(--c-text);
  font-size: 0.85rem;
  font-family: var(--font-body);
  outline: none;
}
.footer-form-row input:focus {
  border-color: var(--c-accent);
}
.footer-form-row button {
  height: 40px;
  padding: 0 1rem;
  background: var(--c-accent);
  color: var(--c-dark);
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.82rem;
  cursor: pointer;
  transition: background 0.2s;
  min-width: 60px;
}
.footer-form-row button:hover { background: var(--c-primary); }

.footer-nav dl {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.footer-nav dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-accent);
  letter-spacing: 0.12em;
  margin-bottom: 0.6rem;
  text-transform: uppercase;
}
.footer-nav dd a {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 0.2rem 0;
  font-size: 0.85rem;
  color: var(--c-text-dim);
  border-bottom: 1px solid var(--c-border);
  transition: color 0.2s, padding-left 0.2s;
}
.footer-nav dd a:hover {
  color: var(--c-primary);
  padding-left: 0.4rem;
}

.footer-bar {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--c-border);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-text-dim);
  text-align: center;
}

/* =========================================
   响应式 — 768px
   ========================================= */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }

  .main-nav {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: rgba(0,20,40,0.98);
    border-bottom: 1px solid var(--c-border);
    padding: 1rem 1.5rem;
  }
  .main-nav.is-open { display: block; }

  .main-nav dl {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
  }
  .nav-brand-title { display: none; }
  .main-nav dd a {
    height: auto;
    min-height: 48px;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--c-border);
    width: 100%;
  }

  .hero-collage { display: none; }
  .hero { min-height: 80vh; }

  .content-layout {
    flex-direction: column;
  }
  .sidebar {
    position: static;
    flex: none;
    width: 100%;
    order: 2;
  }
  .main-content { order: 1; }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2rem 1.5rem 1.5rem;
  }

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

@media (max-width: 480px) {
  :root { --gap: 1rem; }

  .hero-content h1 { font-size: 1.8rem; }
  .hero-deco-text { font-size: 5rem; }

  .footer-form-row { flex-direction: column; }
  .footer-form-row input, .footer-form-row button { width: 100%; }
}

/* =========================================
   脉冲动画细节
   ========================================= */
@keyframes pulse-glow {
  0%,100% { box-shadow: 0 0 0 0 rgba(0,255,65,0); }
  50%      { box-shadow: 0 0 16px 4px rgba(0,255,65,0.18); }
}

.child-card:hover,
.topic-pill:hover {
  animation: pulse-glow 1.8s ease-in-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  .child-card:hover, .topic-pill:hover { animation: none; }
}