/* ===== 科技感设计变量 ===== */
:root {
  --color-bg: #0a0e17;
  --color-bg-alt: #0f1629;
  --color-bg-card: rgba(15, 22, 41, 0.8);
  --color-text: #e2e8f0;
  --color-text-muted: #94a3b8;
  --color-accent: #00f5ff;
  --color-accent-dim: rgba(0, 245, 255, 0.6);
  --color-accent-2: #a855f7;
  --color-accent-3: #0ea5e9;
  --color-border: rgba(0, 245, 255, 0.2);
  --color-glow: 0 0 20px rgba(0, 245, 255, 0.3);
  --font-display: 'Orbitron', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --transition: 0.3s ease;
}

/* ===== 亮色主题 ===== */
[data-theme="light"] {
  --color-bg: #f1f5f9;
  --color-bg-alt: #e2e8f0;
  --color-bg-card: rgba(255, 255, 255, 0.9);
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-accent: #0891b2;
  --color-accent-dim: rgba(8, 145, 178, 0.6);
  --color-accent-2: #7c3aed;
  --color-accent-3: #0284c7;
  --color-border: rgba(8, 145, 178, 0.25);
  --color-glow: 0 0 20px rgba(8, 145, 178, 0.2);
}

[data-theme="light"] .grid-bg {
  background-image:
    linear-gradient(rgba(8, 145, 178, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(8, 145, 178, 0.06) 1px, transparent 1px);
}

[data-theme="light"] .scan-line {
  background: linear-gradient(
    transparent 50%,
    rgba(8, 145, 178, 0.04) 50%
  );
}

[data-theme="light"] .navbar {
  background: rgba(241, 245, 249, 0.9);
}

/* ===== 网格背景 ===== */
.grid-bg {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 245, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 245, 255, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: 0;
}

/* ===== 扫描线效果 ===== */
.scan-line {
  position: fixed;
  inset: 0;
  background: linear-gradient(
    transparent 50%,
    rgba(0, 245, 255, 0.02) 50%
  );
  background-size: 100% 4px;
  animation: scan 8s linear infinite;
  pointer-events: none;
  z-index: 1;
}

@keyframes scan {
  0% { transform: translateY(-100%); }
  100% { transform: translateY(100%); }
}

/* ===== 基础样式 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-mono);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  overflow-x: hidden;
  position: relative;
  z-index: 2;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

/* ===== 选区颜色 ===== */
::selection {
  background: rgba(0, 245, 255, 0.25);
  color: inherit;
}

[data-theme="light"] ::selection {
  background: rgba(8, 145, 178, 0.25);
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
}

.nav-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-accent);
  letter-spacing: 0.15em;
}

.nav-brand a {
  color: inherit;
}

.nav-brand .bracket {
  color: var(--color-accent-2);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  position: relative;
  letter-spacing: 0.05em;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-accent);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-2));
  box-shadow: var(--color-glow);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-accent);
}

/* ===== 主内容区 ===== */
main {
  padding-top: 70px;
  max-width: 1100px;
  margin: 0 auto;
  padding-left: 2rem;
  padding-right: 2rem;
}

/* ===== Hero 区域 ===== */
.hero {
  min-height: calc(100vh - 70px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4rem;
  padding: 4rem 0;
}

.hero-content {
  flex: 1;
  max-width: 520px;
}

.hero-greeting {
  font-size: 0.95rem;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.hero-greeting .prompt {
  color: var(--color-accent-2);
  margin-right: 0.5rem;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.5rem;
  letter-spacing: 0.05em;
}

.hero-title .glow {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 20px var(--color-accent-dim));
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.hero-subtitle .accent {
  color: var(--color-accent);
}

.hero-desc {
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  font-size: 0.9rem;
  opacity: 0.9;
}

.hero-actions {
  display: flex;
  gap: 1rem;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  transition: var(--transition);
  cursor: pointer;
  letter-spacing: 0.02em;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-3));
  color: var(--color-bg);
  border: none;
}

.btn-primary:hover {
  box-shadow: var(--color-glow);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}

.btn-outline:hover {
  background: rgba(0, 245, 255, 0.1);
  box-shadow: var(--color-glow);
  transform: translateY(-2px);
}

/* ===== 终端样式 ===== */
.terminal {
  font-family: var(--font-mono);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 0 40px rgba(0, 245, 255, 0.1);
}

.terminal-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0.75rem 1rem;
  background: rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid var(--color-border);
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.terminal-dot:nth-child(1) { background: #ff5f56; }
.terminal-dot:nth-child(2) { background: #ffbd2e; }
.terminal-dot:nth-child(3) { background: #27ca40; }

.terminal-title {
  margin-left: 1rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.terminal-body {
  padding: 1.5rem;
}

.code-line {
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.code-keyword { color: #c678dd; }
.code-var { color: #e06c75; }
.code-string { color: #98c379; }
.code-fn { color: var(--color-accent); }

.cursor-blink {
  color: var(--color-accent);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

/* ===== 通用区块 ===== */
.section {
  padding: 5rem 0;
  border-top: 1px solid var(--color-border);
}

.page-header {
  min-height: calc(100vh - 200px);
}

.page-actions {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 2.5rem;
  color: var(--color-text);
  letter-spacing: 0.1em;
}

.section-num {
  color: var(--color-accent);
  font-size: 1rem;
  margin-right: 0.5rem;
}

/* ===== 关于 ===== */
.about-content {
  max-width: 640px;
}

.about-text p {
  margin-bottom: 1rem;
  color: var(--color-text-muted);
}

.skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.skill-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.4rem 0.85rem;
  background: rgba(0, 245, 255, 0.08);
  border-radius: 4px;
  color: var(--color-accent);
  border: 1px solid var(--color-border);
}

/* ===== 项目 ===== */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.project-grid--empty {
  place-items: center;
  min-height: 12rem;
}

.project-empty {
  color: var(--color-text-muted);
  font-size: 1rem;
  margin: 0;
}

.project-card {
  padding: 2rem;
  background: var(--color-bg-card);
  border-radius: 8px;
  border: 1px solid var(--color-border);
  transition: var(--transition);
  transition-property: border-color, box-shadow, transform;
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-2));
  opacity: 0;
  transition: var(--transition);
}

.project-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--color-glow);
  transform: translateY(-2px);
}

.project-card:hover::before {
  opacity: 1;
}

.project-icon {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--color-accent);
}

.icon-code {
  font-family: var(--font-mono);
  font-weight: 600;
}

.project-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
  letter-spacing: 0.05em;
}

.project-card p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.project-link {
  font-size: 0.85rem;
  color: var(--color-accent);
}

.project-link:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ===== 博客 ===== */
.blog-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
  align-items: center;
  position: relative;
  z-index: 100;
}

.blog-search-input {
  flex: 1;
  min-width: 200px;
  padding: 0.6rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--color-text);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  transition: var(--transition);
}

.blog-search-input::placeholder {
  color: var(--color-text-muted);
}

.blog-search-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px rgba(0, 245, 255, 0.15);
}

.blog-sort-select {
  padding: 0.6rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--color-text);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
}

.blog-sort-select:hover,
.blog-sort-select:focus {
  border-color: var(--color-accent);
  outline: none;
}

.blog-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.blog-card {
  padding: 1.5rem 2rem;
  background: var(--color-bg-card);
  border-radius: 8px;
  border: 1px solid var(--color-border);
  transition: var(--transition);
  transition-property: border-color, box-shadow, transform;
}

.blog-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 0 24px rgba(0, 245, 255, 0.15);
  transform: translateY(-2px);
}

.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}

.blog-card time,
.blog-card .blog-reading-time {
  display: inline;
  font-size: 0.75rem;
}

.blog-card time {
  font-size: 0.75rem;
  color: var(--color-accent);
}

.blog-card .blog-reading-time {
  color: var(--color-text-muted);
  margin-left: 0.5rem;
}

.blog-card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin: 0.5rem 0;
  letter-spacing: 0.03em;
}

.blog-card h3 a:hover {
  color: var(--color-accent);
}

.blog-card p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.blog-loading {
  color: var(--color-text-muted);
  padding: 2rem;
}

/* ===== 阅读进度条 ===== */
.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-2));
  z-index: 101;
  transition: width 0.1s ease-out;
}

/* ===== 文章详情页 ===== */
.article-page {
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.article-header {
  margin-bottom: 2rem;
  text-align: center;
}

.article-title {
  font-family: var(--font-display);
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
  letter-spacing: 0.03em;
}

.article-date {
  font-size: 0.85rem;
  color: var(--color-accent);
}

.article-reading-time {
  display: block;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

.article-body {
  line-height: 1.8;
}

.article-body h2 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  margin: 2rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.article-body h3 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.75rem;
}

.article-body p {
  margin-bottom: 1rem;
  color: var(--color-text-muted);
}

.article-body a {
  color: var(--color-accent);
}

.article-body a:hover {
  text-decoration: underline;
}

.article-body pre,
.article-body .code-block {
  position: relative;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 1rem 0;
}

.code-block-wrapper {
  position: relative;
  margin: 1rem 0;
}

.code-copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  padding: 0.35rem 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
  z-index: 2;
}

.code-copy-btn:hover {
  background: rgba(0, 245, 255, 0.1);
  border-color: var(--color-accent);
}

.code-copy-btn.copied {
  color: #27ca40;
  border-color: #27ca40;
}

.article-body code {
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.article-body pre code {
  background: none;
  padding: 0;
}

.article-body p code {
  padding: 0.2em 0.4em;
  background: rgba(0, 245, 255, 0.1);
  border-radius: 4px;
}

.article-body ul, .article-body ol {
  margin: 1rem 0;
  padding-left: 1.5rem;
  color: var(--color-text-muted);
}

.article-body blockquote {
  border-left: 4px solid var(--color-accent);
  padding-left: 1rem;
  margin: 1rem 0;
  color: var(--color-text-muted);
}

.article-body img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
}

.article-body .fold-block {
  margin: 1rem 0;
  padding: 1rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 6px;
}

.article-body .fold-block summary {
  cursor: pointer;
  color: var(--color-accent);
  font-weight: 500;
}

.article-body .katex {
  font-size: 1.1em;
}

.article-footer {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

/* ===== 联系 ===== */
.contact-content p {
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.contact-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background: var(--color-bg-card);
  border-radius: 8px;
  border: 1px solid var(--color-border);
  transition: var(--transition);
  transition-property: border-color, box-shadow, transform;
}

.contact-icon {
  font-size: 0.75rem;
  color: var(--color-accent);
}

.contact-item:hover {
  border-color: var(--color-accent);
  box-shadow: var(--color-glow);
  transform: translateY(-2px);
}

/* ===== 页脚 ===== */
.footer {
  text-align: center;
  padding: 2rem;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.footer-code {
  color: var(--color-accent);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .grid-bg {
    background-size: 30px 30px;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg);
    padding: 1rem;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-links.active {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle span {
    background: var(--color-accent);
  }

  .hero {
    flex-direction: column;
    text-align: center;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual {
    width: 100%;
  }

  .terminal {
    font-size: 0.8rem;
  }

  main {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .section {
    padding: 3rem 0;
  }
}

/* ===== 文章目录 TOC ===== */
.article-toc {
  position: sticky;
  top: 90px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  padding: 1rem 0;
}

.article-toc-title {
  font-family: var(--font-display);
  font-size: 0.9rem;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
  letter-spacing: 0.05em;
}

.article-toc-list {
  list-style: none;
}

.article-toc-list a {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  padding: 0.25rem 0;
  padding-left: 0;
  border-left: 2px solid transparent;
  transition: var(--transition);
}

.article-toc-list a:hover,
.article-toc-list a.active {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
}

.article-toc-list li.toc-h3 a {
  padding-left: 1rem;
  font-size: 0.8rem;
}

.article-with-toc {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 900px) {
  .article-with-toc {
    grid-template-columns: 1fr;
    display: flex;
    flex-direction: column-reverse;
  }
  .article-toc {
    position: static;
    max-height: none;
    padding: 1rem 0;
    border-top: 1px solid var(--color-border);
  }
}

/* ===== 主题切换按钮 ===== */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  color: var(--color-accent);
  cursor: pointer;
  transition: var(--transition);
  margin-left: 0.5rem;
}

.theme-toggle:hover {
  background: rgba(0, 245, 255, 0.1);
  border-color: var(--color-accent);
}

.theme-toggle svg {
  width: 1rem;
  height: 1rem;
}

/* ===== 回到顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 90;
  width: 2.75rem;
  height: 2.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--color-accent);
  font-size: 1.25rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(0.5rem);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition),
    color var(--transition), box-shadow var(--transition);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  color: var(--color-text);
  box-shadow: var(--color-glow);
}

.back-to-top:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.back-to-top-icon {
  line-height: 1;
}