/* ========================================
   Analogy Design System - Notion Style
   ======================================== */

/* CSS Variables - Design Tokens */
:root {
  /* Colors */
  --color-bg: #FFF;
  --color-text: #0A0A0A;
  --color-text-secondary: #444444;
  --color-accent: #B80000;
  --color-accent-hover: #8B0000;
  --color-border: #E8E8E8;
  --color-card-bg: #FFFFFF;

  /* Typography - Outfit + Inter */
  --font-heading: "Outfit", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;

  /* Font Sizes - 大字号排版 */
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 18px;
  --text-xl: 24px;
  --text-2xl: 32px;
  --text-3xl: 48px;
  --text-4xl: 64px;

  /* Font Weights */
  --font-normal: 400;
  --font-medium: 500;
  --font-bold: 700;

  /* Shadows - 深邃阴影 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);

  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
}

/* ========================================
   Base Reset & Global Styles
   ======================================== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ========================================
   SVG Noise Overlay - 纸媒质感
   ======================================== */
.noise-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.06;
}

.noise-overlay svg {
  width: 100%;
  height: 100%;
}

/* ========================================
   Typography
   ======================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-bold);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

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

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

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

/* ========================================
   Animation Utilities - 阶梯式显现
   ======================================== */

/* Initial state for animations */
.stagger-1, .stagger-2, .stagger-3, .stagger-4,
.scroll-reveal {
  opacity: 0;
  transform: translateY(24px);
}

/* Staggered entrance animations */
.stagger-1 { animation: staggerFadeIn 0.6s cubic-bezier(0.2, 0.8, 0.2, 1) forwards; animation-delay: 0ms; }
.stagger-2 { animation: staggerFadeIn 0.6s cubic-bezier(0.2, 0.8, 0.2, 1) forwards; animation-delay: 150ms; }
.stagger-3 { animation: staggerFadeIn 0.6s cubic-bezier(0.2, 0.8, 0.2, 1) forwards; animation-delay: 300ms; }
.stagger-4 { animation: staggerFadeIn 0.6s cubic-bezier(0.2, 0.8, 0.2, 1) forwards; animation-delay: 450ms; }

@keyframes staggerFadeIn {
  0% {
    opacity: 0;
    transform: translateY(24px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Scroll reveal animation */
.scroll-reveal {
  transition: opacity 0.8s cubic-bezier(0.2, 0.8, 0.2, 1),
              transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.scroll-reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   Buttons - 磁吸效果 + 物理阻尼悬停
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: transform var(--transition-bounce),
              box-shadow var(--transition-base),
              background-color var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background-color: var(--color-text);
  color: var(--color-bg);
}

.btn-primary:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
}

.btn-accent {
  background-color: var(--color-accent);
  color: white;
}

.btn-accent:hover {
  background-color: var(--color-accent-hover);
  transform: scale(1.05);
  box-shadow: var(--shadow-xl);
}

/* Magnetic button effect */
.btn-magnetic {
  position: relative;
  transition: transform var(--transition-base);
}

.btn-magnetic:hover {
  transform: scale(1.05);
}

/* Scale up on hover */
.hover-scale {
  transition: transform var(--transition-bounce);
}

.hover-scale:hover {
  transform: scale(1.03);
}

/* ========================================
   Home Page Layout
   ======================================== */
.home-page {
  background-color: var(--color-bg);
  position: relative;
}

.content-container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ========================================
   Header - 导航栏
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) 0;
  transition: all var(--transition-base);
}

.header-content {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

.logo-container {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-text);
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.logo-container:hover {
  opacity: 0.8;
}

.logo-container img {
  width: 32px;
  height: 32px;
}

/* Navigation Tabs */
.nav-pill-list {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.tab-nav-container {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.tab-item {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-sm);
  font-weight: var(--font-normal);
  color: var(--color-text-secondary);
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.tab-item:hover {
  color: var(--color-text);
  background-color: rgba(0, 0, 0, 0.04);
}

.tab-item.active {
  color: var(--color-text);
  font-weight: var(--font-medium);
}

/* Language Selector */
.language-selector {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--text-sm);
  color: var(--color-text);
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  transition: background-color var(--transition-fast);
}

.language-selector:hover {
  background-color: rgba(0, 0, 0, 0.04);
}

.dropdown-icon {
  width: 12px;
  height: 12px;
  opacity: 0.6;
}

.language-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: var(--space-sm);
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  min-width: 120px;
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
}

.language-dropdown.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.language-option {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.language-option:hover {
  background-color: rgba(0, 0, 0, 0.04);
}

/* ========================================
   Hero Section
   ======================================== */
.hero-section {
  position: relative;
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 120px var(--space-md) var(--space-3xl);
  text-align: center;
  overflow: hidden;
  background-image: url('images/hero-background.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

/* Hero overlay - 遮罩层，让标题更清晰 */
.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(113, 113, 113, 0.03);
  pointer-events: none;
  z-index: 1;
}

@keyframes ambientMove {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(2%, 2%); }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 600px;
  width: 90%;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(48px, 8vw, 80px);
  font-weight: var(--font-bold);
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
}

.hero-subtitle {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: var(--font-normal);
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2xl);
}

.button-group {
  display: flex;
  width: 100%;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

.extension-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  width: 220px;
  padding: var(--space-md) var(--space-xl);
  background-color: var(--color-text);
  color: var(--color-bg);
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  text-decoration: none;
  transition: all var(--transition-bounce);
  box-shadow: var(--shadow-md);
}

.extension-button:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
  color: var(--color-bg);
}

.extension-icon {
  width: 24px;
  height: 24px;
}

/* ========================================
   Sections Common Styles
   ======================================== */
.section {
  padding: var(--space-3xl) 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.section-heading {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.section-subheading {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: var(--font-normal);
  color: var(--color-text-secondary);
}

/* ========================================
   Cards - 统一深邃阴影
   ======================================== */
.card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transition: all var(--transition-bounce);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

/* ========================================
   Smart Connections Section
   ======================================== */
.smart-connections {
  background-color: var(--color-bg);
  padding: var(--space-3xl) 0;
}

.connections-image-container {
  margin-bottom: var(--space-2xl);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: var(--color-card-bg);
}

.connections-image {
  width: 100%;
  display: block;
}

/* Features Grid */
.features-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
  width: 90%;
}

.feature-column {
  display: flex;
  flex-direction: column;
}

.feature-header {
  margin-bottom: var(--space-md);
}

.feature-heading {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-text);
}

.feature-subheading {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  color: var(--color-text-secondary);
  margin-top: var(--space-xs);
}

.feature-image-container {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  background: var(--color-card-bg);
}

.feature-image {
  width: 100%;
  display: block;
  transition: transform var(--transition-bounce);
}

.feature-image-container:hover .feature-image {
  transform: scale(1.02);
}

/* ========================================
   Chat Section
   ======================================== */
.chat-section {
  background-color: var(--color-bg);
  padding: var(--space-3xl) 0;
  width: 90%;
  margin: 0 auto;
  max-width: 1200px;
}

.chat-image-container {
  width: 100%;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: var(--color-card-bg);
}

.chat-image {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-bounce);
}

.chat-image-container:hover .chat-image {
  transform: scale(1.02);
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background-color: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) 0 var(--space-3xl);
}

.footer-content {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-xl);
}

.footer-title {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.footer-logo {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.footer-logo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.social-links {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-sm);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  transition: all var(--transition-base);
}

.social-link:hover {
  background-color: rgba(0, 0, 0, 0.04);
  transform: scale(1.1);
}

.social-icon {
  width: 24px;
  height: 24px;
}

.footer-resources {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.resources-title {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.resources-item {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.resources-item:hover {
  color: var(--color-accent);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1199px) {
  .header-content {
    flex-wrap: wrap;
    justify-content: space-between;
  }

  .nav-pill-list {
    order: 3;
    width: 100%;
    justify-content: center;
    margin-top: var(--space-sm);
  }

  .hero-title {
    font-size: 48px;
  }
}

@media (max-width: 991px) {
  .features-container {
    grid-template-columns: 1fr;
  }

}

@media (max-width: 576px) {
  /* 减小移动端两侧留白 */
  .content-container,
  .header-content,
  .footer-content,
  .chat-section {
    width: 94%;
    padding: 0 var(--space-sm);
  }

  /* 减小各模块间距 */
  .hero-section {
    min-height: 60vh;
    padding: 80px var(--space-sm) var(--space-xl);
  }

  .section {
    padding: var(--space-2xl) 0;
  }

  .smart-connections,
  .chat-section {
    padding: var(--space-xl) 0;
  }

  /* 减小Hero区域 */
  .hero-title {
    font-size: 36px;
    margin-bottom: var(--space-md);
  }

  .hero-subtitle {
    font-size: var(--text-base);
    margin-bottom: var(--space-lg);
  }

  .section-heading {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-md);
  }

  .section-subheading {
    font-size: var(--text-base);
  }

  /* 按钮自适应 */
  .button-group {
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
  }

  .extension-button {
    width: 100%;
    max-width: 280px;
    padding: var(--space-sm) var(--space-lg);
  }

  /* 减小特性卡片间距 */
  .features-container {
    gap: var(--space-md);
    margin-top: var(--space-lg);
    width: 94%;
  }

  /* 减小footer间距 */
  .footer {
    padding: var(--space-xl) 0 var(--space-lg);
  }

  .footer-content {
    gap: var(--space-lg);
  }
}

/* 小屏幕手机优化 */
@media (max-width: 400px) {
  .content-container,
  .header-content,
  .footer-content,
  .chat-section,
  .features-container {
    width: 96%;
    padding: 0 var(--space-xs);
  }

  .hero-section {
    padding: 70px var(--space-xs) var(--space-lg);
  }

  .hero-title {
    font-size: 32px;
  }

  .hero-subtitle {
    font-size: var(--text-sm);
  }

  .section-heading {
    font-size: var(--text-xl);
  }

  .section-subheading {
    font-size: var(--text-sm);
  }

  .extension-button {
    max-width: 100%;
    font-size: var(--text-xs);
  }
}

/* ========================================
   Blog Pages Styles
   ======================================== */

.blog-page {
  background-color: var(--color-bg);
  min-height: 100vh;
  padding-top: 100px;
}

.blog-container {
  max-width: 680px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
}

.blog-header {
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.blog-title {
  font-family: var(--font-heading);
  font-size: clamp(28px, 5vw, 40px);
  font-weight: var(--font-bold);
  color: var(--color-text);
  margin-bottom: var(--space-md);
  line-height: 1.2;
}

.blog-meta {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.blog-content {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--color-text);
}

.blog-content p {
  margin-bottom: var(--space-lg);
}

.blog-content h2 {
  font-size: var(--text-xl);
  margin: var(--space-2xl) 0 var(--space-md);
}

.blog-content h3 {
  font-size: var(--text-lg);
  margin: var(--space-xl) 0 var(--space-sm);
}

.blog-content ul, .blog-content ol {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
}

.blog-content li {
  margin-bottom: var(--space-sm);
}

.blog-content img {
  max-width: 100%;
  border-radius: 8px;
  margin: var(--space-lg) 0;
  box-shadow: var(--shadow-md);
}

/* ========================================
   Policy Pages Styles
   ======================================== */
.policy-page {
  background-color: var(--color-bg);
  min-height: 100vh;
  padding-top: 80px;
}

.policy-container {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg) var(--space-3xl);
}

.policy-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.policy-title {
  font-family: var(--font-heading);
  font-size: clamp(28px, 5vw, 36px);
  font-weight: var(--font-bold);
  color: var(--color-text);
}

.policy-content {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--color-text);
}

.policy-content h2 {
  font-size: var(--text-xl);
  margin: var(--space-2xl) 0 var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
}

.policy-content h2:first-child {
  padding-top: 0;
  border-top: none;
}

.policy-content p {
  margin-bottom: var(--space-md);
}

.policy-content ul, .policy-content ol {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
}

.policy-content li {
  margin-bottom: var(--space-sm);
}

.last-updated {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-lg);
}

/* ========================================
   Utility Classes
   ======================================== */
.text-center { text-align: center; }
.text-accent { color: var(--color-accent); }
.font-bold { font-weight: var(--font-bold); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

/* Focus styles for accessibility */
*:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Selection color */
::selection {
  background-color: var(--color-accent);
  color: white;
}