/* 
 * Oliver 技术笔记 - 样式表
 * 明亮高科技风格：锂电池实验室美学
 * 配色：锂银白、铜箔橙、电解液青、轻石墨
 */

:root {
  /* 色彩系统 - 明亮实验室 */
  --color-bg: #fafbfc;
  --color-bg-secondary: #f4f6f8;
  --color-bg-elevated: #ffffff;
  --color-bg-glass: rgba(255, 255, 255, 0.9);
  
  /* 锂电配色 */
  --color-lithium: #e8ecf0;
  --color-lithium-bright: #f5f7fa;
  --color-copper: #c8733a;
  --color-copper-bright: #d68a52;
  --color-copper-glow: rgba(200, 115, 58, 0.2);
  --color-electrolyte: #0891b2;
  --color-electrolyte-bright: #06b6d4;
  --color-electrolyte-glow: rgba(8, 145, 178, 0.15);
  --color-graphite: #2d3748;
  --color-graphite-light: #4a5568;
  --color-graphite-border: #cbd5e0;
  
  /* 文字颜色 */
  --color-text-primary: #1a202c;
  --color-text-secondary: #4a5568;
  --color-text-tertiary: #718096;
  --color-text-muted: #a0aec0;
  
  /* 边框与分割线 */
  --color-border: #e2e8f0;
  --color-border-medium: #cbd5e0;
  --color-border-strong: #a0aec0;
  
  /* 强调色 */
  --color-accent: var(--color-copper);
  --color-accent-hover: var(--color-copper-bright);
  --color-accent-secondary: var(--color-electrolyte);
  
  /* 间距系统 */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  
  /* 字体 */
  --font-sans: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: "Noto Serif SC", Georgia, serif;
  --font-mono: "SF Mono", "Fira Code", "Roboto Mono", monospace;
  
  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 24px rgba(0, 0, 0, 0.1), 0 4px 8px rgba(0, 0, 0, 0.08);
  --shadow-glow-copper: 0 0 24px var(--color-copper-glow);
  --shadow-glow-electrolyte: 0 0 24px var(--color-electrolyte-glow);
  
  /* 阅读宽度 */
  --measure: 68ch;
  --measure-narrow: 50ch;
  --measure-wide: 80ch;
}

/* 全局样式 */
* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  position: relative;
  overflow-x: hidden;
}

/* 背景网格效果 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px),
    linear-gradient(0deg, var(--color-border) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.4;
  pointer-events: none;
  z-index: -2;
}

/* 动态能量线画布 */
#energy-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
  opacity: 0.3;
}

/* 容器 */
.container {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-lg);
  }
}

@media (max-width: 480px) {
  body {
    font-size: 16px;
  }
  
  .container {
    padding: 0 var(--space-md);
  }
}

/* 页眉 */
.site-header {
  background: var(--color-bg-glass);
  border-bottom: 2px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px) saturate(180%);
  box-shadow: var(--shadow-sm);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) 0;
  gap: var(--space-lg);
}

.site-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
  transition: all 0.3s ease;
  font-family: var(--font-mono);
  position: relative;
}

.site-title::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-copper), var(--color-electrolyte));
  transition: width 0.3s ease;
}

.site-title:hover {
  color: var(--color-accent);
}

.site-title:hover::after {
  width: 100%;
}

.nav-menu {
  display: flex;
  gap: var(--space-xl);
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: all 0.3s ease;
  position: relative;
  padding: 0.5rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width 0.3s ease;
}

.nav-link:hover {
  color: var(--color-text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link.active {
  color: var(--color-accent);
}

@media (max-width: 640px) {
  .header-content {
    padding: var(--space-md) 0;
  }
  
  .nav-menu {
    gap: var(--space-md);
  }
  
  .nav-link {
    font-size: 0.875rem;
  }
}

/* 主内容区 */
main {
  padding: var(--space-4xl) 0;
  min-height: calc(100vh - 200px);
  position: relative;
}

@media (max-width: 768px) {
  main {
    padding: var(--space-3xl) 0;
  }
}

@media (max-width: 480px) {
  main {
    padding: var(--space-2xl) 0;
  }
}

/* 首页Hero区 */
.hero {
  margin-bottom: var(--space-4xl);
  padding-bottom: var(--space-3xl);
  border-bottom: 2px solid var(--color-border);
  max-width: var(--measure-wide);
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20px;
  left: -40px;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, var(--color-electrolyte-glow) 0%, transparent 70%);
  pointer-events: none;
  animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.3; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.1); }
}

.name {
  font-size: 3.5rem;
  font-weight: 800;
  margin: 0 0 var(--space-md);
  letter-spacing: -0.03em;
  line-height: 1.1;
  background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-copper) 50%, var(--color-electrolyte) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 8s ease infinite;
  background-size: 200% 200%;
}

@keyframes gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.title {
  font-size: 1.5rem;
  color: var(--color-accent);
  margin: 0 0 var(--space-xl);
  font-weight: 600;
  letter-spacing: 0.01em;
}

.tagline {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
  max-width: var(--measure);
  margin: 0;
  font-weight: 400;
}

@media (max-width: 768px) {
  .name {
    font-size: 2.75rem;
  }
  
  .title {
    font-size: 1.25rem;
  }
  
  .tagline {
    font-size: 1.0625rem;
  }
}

@media (max-width: 480px) {
  .name {
    font-size: 2.25rem;
  }
  
  .title {
    font-size: 1.125rem;
  }
  
  .tagline {
    font-size: 1rem;
  }
}

/* 笔记列表 */
.notes-section {
  margin-top: var(--space-3xl);
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-md);
  border-bottom: 2px solid var(--color-border);
}

.section-header h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}

.view-all {
  color: var(--color-accent);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 600;
  transition: all 0.3s ease;
  letter-spacing: 0.01em;
  position: relative;
}

.view-all::after {
  content: '→';
  margin-left: 0.25rem;
  transition: transform 0.3s ease;
  display: inline-block;
}

.view-all:hover {
  color: var(--color-accent-hover);
}

.view-all:hover::after {
  transform: translateX(4px);
}

.note-card {
  background: var(--color-bg-elevated);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  margin-bottom: var(--space-xl);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.note-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 0;
  background: linear-gradient(180deg, var(--color-copper), var(--color-electrolyte));
  transition: height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: var(--radius-sm);
}

.note-card::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, var(--color-electrolyte-glow) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.note-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-lg), var(--shadow-glow-copper);
  transform: translateY(-4px);
}

.note-card:hover::before {
  height: 100%;
}

.note-card:hover::after {
  opacity: 1;
}

.note-date {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 600;
}

.note-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 var(--space-md);
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.note-title a {
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color 0.3s ease;
  background: linear-gradient(to right, var(--color-copper) 0%, var(--color-copper) 100%);
  background-size: 0% 2px;
  background-repeat: no-repeat;
  background-position: left bottom;
  padding-bottom: 2px;
}

.note-title a:hover {
  color: var(--color-accent);
  background-size: 100% 2px;
}

.note-excerpt {
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.75;
  font-size: 1.0625rem;
}

@media (max-width: 768px) {
  .note-card {
    padding: var(--space-xl);
  }
  
  .note-title {
    font-size: 1.25rem;
  }
  
  .note-excerpt {
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .note-card {
    padding: var(--space-lg);
  }
  
  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
}

/* 关于页面 */
.about-content {
  max-width: var(--measure);
  font-family: var(--font-serif);
}

.about-content h1 {
  font-size: 2.75rem;
  font-weight: 800;
  margin: 0 0 var(--space-3xl);
  letter-spacing: -0.02em;
  font-family: var(--font-sans);
  color: var(--color-text-primary);
}

.about-content h2 {
  font-size: 1.625rem;
  font-weight: 700;
  margin: var(--space-3xl) 0 var(--space-lg);
  color: var(--color-text-primary);
  border-bottom: 3px solid var(--color-accent);
  padding-bottom: var(--space-sm);
  letter-spacing: -0.01em;
  font-family: var(--font-sans);
  display: inline-block;
}

.about-content h2:first-of-type {
  margin-top: 0;
}

.about-content p {
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
  font-size: 1.0625rem;
}

.about-content ul {
  color: var(--color-text-secondary);
  line-height: 1.8;
  padding-left: var(--space-xl);
  margin: var(--space-lg) 0;
  font-size: 1.0625rem;
}

.about-content li {
  margin-bottom: var(--space-md);
  position: relative;
}

.about-content li::marker {
  color: var(--color-accent);
  font-weight: 700;
}

.about-content strong {
  color: var(--color-text-primary);
  font-weight: 700;
}

.contact-info {
  background: linear-gradient(135deg, var(--color-lithium-bright) 0%, var(--color-bg-elevated) 100%);
  border: 2px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-top: var(--space-3xl);
  font-family: var(--font-sans);
  box-shadow: var(--shadow-md);
}

.contact-info h2 {
  margin-top: 0;
  border: none;
  padding: 0;
}

.contact-info p {
  margin-bottom: var(--space-md);
}

.contact-info p:last-child {
  margin-bottom: 0;
}

@media (max-width: 768px) {
  .about-content h1 {
    font-size: 2.25rem;
  }
  
  .about-content h2 {
    font-size: 1.5rem;
  }
  
  .about-content p,
  .about-content ul {
    font-size: 1rem;
  }
}

/* 文章页面 */
.article-header {
  margin-bottom: var(--space-3xl);
  padding-bottom: var(--space-xl);
  border-bottom: 2px solid var(--color-border);
  max-width: var(--measure);
}

.article-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin: 0 0 var(--space-lg);
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--color-text-primary);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  align-items: center;
}

.article-meta time {
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 600;
}

.tag {
  background: linear-gradient(135deg, var(--color-electrolyte-glow) 0%, rgba(6, 182, 212, 0.1) 100%);
  color: var(--color-electrolyte);
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  border: 1px solid rgba(8, 145, 178, 0.3);
  transition: all 0.3s ease;
}

.tag:hover {
  background: var(--color-electrolyte);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow-electrolyte);
}

.article-content {
  max-width: var(--measure);
  font-size: 1.0625rem;
  line-height: 1.8;
  font-family: var(--font-serif);
}

.article-content h2 {
  font-size: 1.875rem;
  font-weight: 700;
  margin: var(--space-3xl) 0 var(--space-lg);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
  font-family: var(--font-sans);
  position: relative;
  padding-top: var(--space-lg);
}

.article-content h2::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4rem;
  height: 3px;
  background: linear-gradient(90deg, var(--color-copper), var(--color-electrolyte));
  border-radius: var(--radius-sm);
}

.article-content h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: var(--space-2xl) 0 var(--space-md);
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
  font-family: var(--font-sans);
}

.article-content p {
  margin-bottom: var(--space-lg);
  color: var(--color-text-secondary);
}

.article-content p:first-of-type::first-letter {
  font-size: 4em;
  font-weight: 800;
  line-height: 0.85;
  float: left;
  margin: 0.05em 0.1em 0 0;
  background: linear-gradient(135deg, var(--color-copper), var(--color-electrolyte));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-family: var(--font-sans);
}

.article-content ul,
.article-content ol {
  margin: var(--space-lg) 0;
  padding-left: var(--space-xl);
  color: var(--color-text-secondary);
}

.article-content li {
  margin-bottom: var(--space-md);
  line-height: 1.8;
}

.article-content li::marker {
  color: var(--color-accent);
  font-weight: 700;
}

.article-content code {
  background: var(--color-lithium);
  color: var(--color-copper);
  padding: 0.2em 0.5em;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.9em;
  border: 1px solid var(--color-border);
  font-weight: 500;
}

.article-content pre {
  background: var(--color-lithium-bright);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  overflow-x: auto;
  margin: var(--space-xl) 0;
  box-shadow: var(--shadow-md);
}

.article-content pre code {
  background: none;
  padding: 0;
  color: var(--color-text-primary);
  border: none;
}

.article-content blockquote {
  border-left: 4px solid var(--color-accent);
  background: linear-gradient(90deg, var(--color-copper-glow) 0%, transparent 100%);
  padding: var(--space-lg) var(--space-xl);
  margin: var(--space-xl) 0;
  color: var(--color-text-primary);
  font-style: italic;
  font-size: 1.125rem;
  line-height: 1.7;
  position: relative;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.article-content blockquote::before {
  content: '"';
  position: absolute;
  left: var(--space-md);
  top: 0;
  font-size: 4em;
  color: var(--color-copper);
  opacity: 0.2;
  font-family: Georgia, serif;
  line-height: 1;
}

.article-content strong {
  color: var(--color-text-primary);
  font-weight: 700;
}

.article-content a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 2px solid var(--color-copper-glow);
  transition: all 0.3s ease;
  font-weight: 500;
}

.article-content a:hover {
  color: var(--color-accent-hover);
  border-bottom-color: var(--color-accent);
  background: var(--color-copper-glow);
}

.article-content hr {
  border: none;
  border-top: 2px solid var(--color-border);
  margin: var(--space-3xl) 0;
}

.sample-note-badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--color-electrolyte-glow) 0%, rgba(6, 182, 212, 0.15) 100%);
  color: var(--color-electrolyte);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--space-xl);
  border: 2px solid rgba(8, 145, 178, 0.3);
  font-family: var(--font-sans);
}

@media (max-width: 768px) {
  .article-title {
    font-size: 2rem;
  }
  
  .article-content {
    font-size: 1rem;
  }
  
  .article-content h2 {
    font-size: 1.625rem;
  }
  
  .article-content h3 {
    font-size: 1.25rem;
  }
  
  .article-content blockquote {
    font-size: 1.0625rem;
  }
}

/* 笔记索引页 */
.notes-list {
  max-width: 56rem;
}

.notes-list .note-card {
  margin-bottom: var(--space-2xl);
}

.notes-list h1 {
  font-size: 2.75rem;
  font-weight: 800;
  margin: 0 0 var(--space-lg);
  letter-spacing: -0.02em;
}

.notes-list .tagline {
  margin-bottom: var(--space-3xl);
  padding-bottom: var(--space-xl);
  border-bottom: 2px solid var(--color-border);
}

/* 404页面 */
.error-page {
  text-align: center;
  padding: var(--space-4xl) 0;
  max-width: var(--measure-narrow);
  margin: 0 auto;
}

.error-code {
  font-size: 10rem;
  font-weight: 900;
  margin: 0;
  background: linear-gradient(135deg, var(--color-copper) 0%, var(--color-electrolyte) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  font-family: var(--font-mono);
  animation: gradient-shift 8s ease infinite;
  background-size: 200% 200%;
}

.error-message {
  font-size: 1.5rem;
  color: var(--color-text-secondary);
  margin: var(--space-xl) 0 var(--space-2xl);
  line-height: 1.5;
}

.btn-home {
  display: inline-block;
  background: linear-gradient(135deg, var(--color-copper), var(--color-electrolyte));
  color: white;
  padding: 1rem 2rem;
  border-radius: var(--radius-lg);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-md);
  border: none;
  font-size: 1rem;
}

.btn-home:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), var(--shadow-glow-copper);
}

@media (max-width: 768px) {
  .error-code {
    font-size: 7rem;
  }
  
  .error-message {
    font-size: 1.25rem;
  }
}

/* 页脚 */
.site-footer {
  background: var(--color-bg-secondary);
  border-top: 2px solid var(--color-border);
  padding: var(--space-2xl) 0;
  margin-top: var(--space-4xl);
}

.site-footer p {
  margin: 0;
  text-align: center;
  color: var(--color-text-tertiary);
  font-size: 0.875rem;
  letter-spacing: 0.01em;
}

.site-footer a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.3s ease;
  font-weight: 500;
}

.site-footer a:hover {
  color: var(--color-accent);
}

/* 无障碍 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* 选择文本样式 */
::selection {
  background: var(--color-copper-glow);
  color: var(--color-text-primary);
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border-medium);
  border-radius: 6px;
  border: 2px solid var(--color-bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent);
}