/* ============================================
   Cool Blog - 全局樣式
   一個現代、響應式的個人部落格
   ============================================ */

/* ============================================
   CSS 變數 - 主題配色
   ============================================ */
:root {
  /* 主要顏色 */
  --primary-color: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;

  /* 輔助顏色 */
  --secondary-color: #ec4899;
  --accent-color: #10b981;

  /* 背景顏色 */
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;

  /* 文字顏色 */
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-light: #9ca3af;

  /* 邊框顏色 */
  --border-color: #e5e7eb;
  --border-light: #f3f4f6;

  /* 陰影 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

  /* 漸變 */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);

  /* 間距 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;

  /* 字體 */
  --font-primary: "Poppins", "Noto Sans TC", sans-serif;
  --font-secondary: "Noto Sans TC", sans-serif;

  /* 動畫時間 */
  --transition-fast: 0.2s;
  --transition-normal: 0.3s;
  --transition-slow: 0.5s;
}

/* 深色模式變數 */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;

  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-light: #94a3b8;

  --border-color: #334155;
  --border-light: #1e293b;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

/* ============================================
   全局重置與基礎樣式
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-primary);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition:
    background-color var(--transition-normal),
    color var(--transition-normal);
}

/* ============================================
   容器
   ============================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ============================================
   預載入動畫
   ============================================ */
#preloader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-primary);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition:
    opacity 0.5s ease,
    visibility 0.5s ease;
}

#preloader.hidden {
  opacity: 0;
  visibility: hidden;
}

.loader {
  width: 50px;
  height: 50px;
  border: 4px solid var(--border-color);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* ============================================
   導航欄
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: var(--bg-primary);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition:
    background-color var(--transition-normal),
    box-shadow var(--transition-normal);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.9);
}

[data-theme="dark"] .navbar.scrolled {
  background: rgba(15, 23, 42, 0.9);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
}

.nav-brand {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-menu {
  display: flex;
  list-style: none;
  align-items: center;
  gap: var(--spacing-md);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.lang-switcher {
  display: flex;
  align-items: center;
}

.lang-select {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  font-size: 0.875rem;
  cursor: pointer;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.lang-select:hover,
.lang-select:focus {
  background: var(--bg-secondary);
  border-color: var(--primary-color);
  outline: none;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
  padding: 0.5rem 0;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-normal);
}

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

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-normal);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

.theme-toggle {
  background: var(--bg-tertiary);
  border: none;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 1.2rem;
}

.theme-toggle:hover {
  background: var(--primary-color);
  transform: scale(1.1);
}

/* ============================================
   Hero 區塊
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.gradient-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-primary);
  opacity: 0.05;
}

.particles {
  position: absolute;
  width: 100%;
  height: 100%;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--primary-color);
  border-radius: 50%;
  opacity: 0.3;
  animation: float 20s infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0) translateX(0);
  }
  50% {
    transform: translateY(-100px) translateX(50px);
  }
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-text {
  animation: fadeInUp 1s ease;
}

.wave {
  display: inline-block;
  animation: wave 2s infinite;
}

@keyframes wave {
  0%,
  100% {
    transform: rotate(0deg);
  }
  25% {
    transform: rotate(20deg);
  }
  75% {
    transform: rotate(-20deg);
  }
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
}

.typing-text::after {
  content: "|";
  animation: blink 1s infinite;
}

@keyframes blink {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0;
  }
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  max-width: 500px;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.btn {
  padding: 0.875rem 2rem;
  border: none;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  font-family: var(--font-primary);
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-md);
}

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

.btn-secondary {
  background: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
  background: var(--primary-color);
  color: white;
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.btn-outline:hover {
  background: var(--bg-secondary);
  border-color: var(--primary-color);
}

.btn-block {
  width: 100%;
  justify-content: center;
}

.btn-arrow {
  transition: transform var(--transition-fast);
}

.btn:hover .btn-arrow {
  transform: translateX(4px);
}

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.avatar-container {
  position: relative;
  width: 300px;
  height: 300px;
}

.avatar-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  height: 100%;
  border: 3px solid var(--primary-color);
  border-radius: 50%;
  animation: pulse 3s infinite;
}

@keyframes pulse {
  0%,
  100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
  }
  50% {
    transform: translate(-50%, -50%) scale(1.1);
    opacity: 0.7;
  }
}

.avatar {
  position: relative;
  width: 250px;
  height: 250px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: var(--shadow-xl);
  margin: 25px;
}

.avatar-emoji {
  font-size: 8rem;
}

.scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  color: var(--text-light);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%,
  100% {
    transform: translateX(-50%) translateY(0);
  }
  50% {
    transform: translateX(-50%) translateY(-10px);
  }
}

.mouse {
  width: 25px;
  height: 40px;
  border: 2px solid var(--text-light);
  border-radius: 15px;
  display: block;
  margin: 0 auto 10px;
  position: relative;
}

.wheel {
  width: 4px;
  height: 8px;
  background: var(--text-light);
  border-radius: 2px;
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  animation: scroll 1.5s infinite;
}

@keyframes scroll {
  0% {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateX(-50%) translateY(15px);
  }
}

/* ============================================
   區塊標題
   ============================================ */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: 2px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-top: var(--spacing-md);
}

/* ============================================
   關於我
   ============================================ */
.about {
  padding: var(--spacing-xl) 0;
  background: var(--bg-secondary);
}

.about-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.about-card {
  background: var(--bg-primary);
  padding: var(--spacing-lg);
  border-radius: 20px;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  text-align: center;
}

.about-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-xl);
}

.card-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.about-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.about-card p {
  color: var(--text-secondary);
  line-height: 1.8;
}

.skills-section {
  margin-top: var(--spacing-xl);
}

.skills-title {
  font-size: 1.8rem;
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.skill-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  background: var(--bg-primary);
  padding: var(--spacing-md);
  border-radius: 15px;
  box-shadow: var(--shadow-sm);
}

.skill-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.skill-info {
  flex: 1;
}

.skill-info h4 {
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.skill-bar {
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: 10px;
  overflow: hidden;
}

.skill-progress {
  height: 100%;
  background: var(--gradient-primary);
  width: var(--progress);
  border-radius: 10px;
  transition: width 1s ease;
}

/* ============================================
   部落格
   ============================================ */
.blog {
  padding: var(--spacing-xl) 0;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.blog-card {
  background: var(--bg-primary);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.blog-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-xl);
}

.blog-image {
  position: relative;
  height: 200px;
  overflow: hidden;
}

.blog-placeholder {
  width: 100%;
  height: 100%;
  background: var(--gradient-primary);
  display: flex;
  justify-content: center;
  align-items: center;
}

.blog-placeholder-icon {
  font-size: 4rem;
  opacity: 0.7;
}

.blog-category {
  position: absolute;
  top: 15px;
  left: 15px;
  background: var(--bg-primary);
  color: var(--primary-color);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
}

.blog-content {
  padding: var(--spacing-md);
}

.blog-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  color: var(--text-light);
  font-size: 0.875rem;
}

.blog-date,
.blog-readtime {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.blog-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
  line-height: 1.4;
}

.blog-excerpt {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.blog-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.tag {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: 15px;
  font-size: 0.875rem;
}

.blog-pagination {
  text-align: center;
  margin-top: var(--spacing-lg);
}

/* ============================================
   文章詳細 Modal
   ============================================ */
.article-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2000;
}

.article-modal.active {
  display: block;
}

.modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
  animation: fadeIn var(--transition-normal);
}

.modal-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 90%;
  max-width: 900px;
  max-height: 90vh;
  background: var(--bg-primary);
  border-radius: 20px;
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  animation: slideUp var(--transition-normal);
}

@keyframes slideUp {
  from {
    transform: translate(-50%, -40%);
    opacity: 0;
  }
  to {
    transform: translate(-50%, -50%);
    opacity: 1;
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.modal-close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  width: 40px;
  height: 40px;
  background: var(--bg-secondary);
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
}

.modal-close:hover {
  background: var(--primary-color);
  color: white;
  transform: scale(1.1);
}

.modal-body {
  padding: var(--spacing-xl);
  overflow-y: auto;
  max-height: 90vh;
}

.article-content {
  max-width: 800px;
  margin: 0 auto;
}

.article-header {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 2px solid var(--border-color);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.article-category {
  background: var(--gradient-primary);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-weight: 600;
}

.article-date,
.article-readtime {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.article-title {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.article-body {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xl);
}

.article-body h2 {
  font-size: 1.875rem;
  font-weight: 700;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.article-body h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.article-body p {
  margin-bottom: var(--spacing-md);
}

.article-body ul,
.article-body ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
}

.article-body li {
  margin-bottom: var(--spacing-xs);
}

.article-body code {
  background: var(--bg-secondary);
  padding: 0.2rem 0.5rem;
  border-radius: 5px;
  font-family: "Courier New", monospace;
  font-size: 0.9em;
  color: var(--primary-color);
}

.article-body pre {
  background: var(--bg-secondary);
  padding: var(--spacing-md);
  border-radius: 10px;
  overflow-x: auto;
  margin-bottom: var(--spacing-md);
}

.article-body pre code {
  background: transparent;
  padding: 0;
  color: var(--text-primary);
}

.article-body blockquote {
  border-left: 4px solid var(--primary-color);
  padding-left: var(--spacing-md);
  margin: var(--spacing-md) 0;
  font-style: italic;
  color: var(--text-secondary);
}

.article-footer {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 2px solid var(--border-color);
}

.article-share {
  margin-bottom: var(--spacing-xl);
}

.article-share h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.share-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-primary);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.share-btn:hover {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
  transform: translateY(-2px);
}

.article-navigation {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

.nav-article {
  background: var(--bg-secondary);
  padding: var(--spacing-md);
  border: 2px solid var(--border-color);
  border-radius: 15px;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-align: left;
}

.nav-article:hover {
  background: var(--bg-tertiary);
  border-color: var(--primary-color);
  transform: translateY(-5px);
}

.nav-article .nav-label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
}

.nav-article .nav-title {
  display: block;
  color: var(--text-primary);
  font-weight: 600;
}

.next-article {
  text-align: right;
}

.prev-article:only-child,
.next-article:only-child {
  grid-column: 1 / -1;
}
.projects {
  padding: var(--spacing-xl) 0;
  background: var(--bg-secondary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
}

.project-card {
  background: var(--bg-primary);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-xl);
}

.project-image {
  position: relative;
  height: 250px;
  overflow: hidden;
}

.project-placeholder {
  width: 100%;
  height: 100%;
  background: var(--gradient-primary);
  display: flex;
  justify-content: center;
  align-items: center;
}

.placeholder-icon {
  font-size: 5rem;
  opacity: 0.7;
}

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(99, 102, 241, 0.9);
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

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

.project-links {
  display: flex;
  gap: var(--spacing-md);
}

.project-link {
  width: 50px;
  height: 50px;
  background: white;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--primary-color);
  font-size: 1.5rem;
  transition: all var(--transition-fast);
  text-decoration: none;
  border: none;
  cursor: pointer;
  position: relative;
  z-index: 10;
}

.project-link span {
  pointer-events: none;
}

.project-link:hover {
  transform: scale(1.2);
}

.project-content {
  padding: var(--spacing-md);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
}

.project-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.project-card p {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================
   聯絡
   ============================================ */
.contact {
  padding: var(--spacing-xl) 0;
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  background: var(--bg-secondary);
  padding: var(--spacing-md);
  border-radius: 15px;
  transition: all var(--transition-normal);
}

.contact-item:hover {
  background: var(--bg-tertiary);
  transform: translateX(10px);
}

.contact-icon {
  font-size: 2rem;
  width: 60px;
  height: 60px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: var(--gradient-primary);
  border-radius: 15px;
  flex-shrink: 0;
}

.contact-details h4 {
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.contact-details a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.contact-details a:hover {
  color: var(--primary-color);
}

.contact-form {
  background: var(--bg-secondary);
  padding: var(--spacing-lg);
  border-radius: 20px;
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-md);
  border: 2px solid var(--border-color);
  border-radius: 10px;
  font-size: 1rem;
  font-family: var(--font-primary);
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
}

.form-message {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: 10px;
  display: none;
}

.form-message.success {
  display: block;
  background: #d1fae5;
  color: #065f46;
}

.form-message.error {
  display: block;
  background: #fee2e2;
  color: #991b1b;
}

/* ============================================
   頁尾
   ============================================ */
.footer {
  background: var(--bg-secondary);
  padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.footer-brand h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-xs);
}

.footer-brand p {
  color: var(--text-secondary);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.footer-column h4 {
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.footer-column ul {
  list-style: none;
}

.footer-column li {
  margin-bottom: var(--spacing-xs);
}

.footer-column a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-column a:hover {
  color: var(--primary-color);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: var(--spacing-md);
  text-align: center;
  color: var(--text-secondary);
}

.footer-tech {
  margin-top: var(--spacing-xs);
  font-size: 0.875rem;
}

/* ============================================
   回到頂部按鈕
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--gradient-primary);
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

/* ============================================
   動畫類別
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease;
}

/* ============================================
   登入頁面
   ============================================ */
.login-page {
  background: var(--bg-secondary);
  min-height: 100vh;
}

.login-navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.login-nav-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.login-main {
  padding-top: 120px;
  padding-bottom: var(--spacing-xl);
}

.login-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--spacing-xl);
  align-items: stretch;
}

.login-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
}

.login-header {
  margin-bottom: var(--spacing-lg);
}

.login-eyebrow {
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: var(--spacing-xs);
}

.login-title {
  font-size: 2.25rem;
  margin-bottom: var(--spacing-xs);
}

.login-subtitle {
  color: var(--text-secondary);
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.login-form label {
  font-weight: 600;
  display: block;
  margin-bottom: 0.5rem;
}

.login-form input[type="email"],
.login-form input[type="password"],
.login-form input[type="text"] {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 1rem;
  transition: border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast);
}

.login-form input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
  background: var(--bg-primary);
}

.input-wrapper {
  position: relative;
}

.password-toggle {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.password-toggle:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.form-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.checkbox {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-block {
  width: 100%;
  justify-content: center;
}

.form-status {
  min-height: 1.5rem;
  font-size: 0.9rem;
}

.form-status.success {
  color: var(--accent-color);
}

.form-status.error {
  color: #ef4444;
}

.login-footer {
  margin-top: var(--spacing-md);
  display: flex;
  gap: 0.5rem;
  color: var(--text-secondary);
}

.link {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
}

.link:hover {
  text-decoration: underline;
}

.login-panel {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
}

.panel-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  background: rgba(99, 102, 241, 0.12);
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.login-panel h2 {
  margin-bottom: var(--spacing-sm);
}

.login-panel p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.panel-list {
  list-style: none;
  display: grid;
  gap: 0.75rem;
  color: var(--text-secondary);
}

/* ============================================
   響應式設計
   ============================================ */
@media (max-width: 968px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-description {
    margin-left: auto;
    margin-right: auto;
  }

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

  .hero-image {
    order: -1;
  }

  .avatar-container {
    width: 200px;
    height: 200px;
  }

  .avatar {
    width: 150px;
    height: 150px;
  }

  .avatar-emoji {
    font-size: 5rem;
  }

  .contact-content {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
  }

  .article-navigation {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--bg-primary);
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .hero-title {
    font-size: 2rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .blog-grid,
  .projects-grid {
    grid-template-columns: 1fr;
  }

  .article-title {
    font-size: 2rem;
  }

  .article-body {
    font-size: 1rem;
  }

  .share-buttons {
    flex-direction: column;
  }

  .form-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  .container {
    padding: 0 var(--spacing-sm);
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .btn {
    padding: 0.75rem 1.5rem;
  }

  .article-title {
    font-size: 1.5rem;
  }
}

/* ============================================
   全文章頁面樣式
   ============================================ */
.all-articles-page {
  padding-top: 80px;
  min-height: 100vh;
}

.page-header {
  background: var(--gradient-primary);
  padding: 4rem 0 3rem;
  text-align: center;
  margin-bottom: 3rem;
}

.page-title {
  font-size: 3rem;
  font-weight: 700;
  color: white;
  margin-bottom: 1rem;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.page-subtitle {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.9);
  font-weight: 300;
}

.articles-section {
  padding: 2rem 0 4rem;
}

.articles-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.filter-group,
.sort-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.filter-group label,
.sort-group label {
  font-weight: 600;
  color: var(--text-primary);
}

.filter-select,
.sort-select {
  padding: 0.5rem 1rem;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.filter-select:hover,
.sort-select:hover {
  border-color: var(--primary-color);
}

.filter-select:focus,
.sort-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
}

.no-articles {
  text-align: center;
  padding: 4rem 0;
  color: var(--text-secondary);
  font-size: 1.25rem;
}

/* 文章卡片標題樣式增強 */
.article-card-title {
  transition: color var(--transition-normal);
  position: relative;
  display: inline-block;
}

.article-card-title:hover {
  color: var(--primary-color);
}

.article-card-title::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: width var(--transition-normal);
}

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

/* ============================================
   單篇文章頁面樣式
   ============================================ */
.article-page {
  padding-top: 80px;
  min-height: 100vh;
  background-color: var(--bg-secondary);
}

.article-nav {
  padding: 2rem 0 1rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 1rem;
  transition: all var(--transition-normal);
  padding: 0.5rem 1rem;
  border-radius: 8px;
}

.back-link:hover {
  color: var(--primary-color);
  background-color: var(--bg-tertiary);
  transform: translateX(-4px);
}

.back-link span:first-child {
  font-size: 1.25rem;
}

.article-content {
  background-color: var(--bg-primary);
  border-radius: 16px;
  padding: 3rem;
  margin-bottom: 3rem;
  box-shadow: var(--shadow-md);
}

.article-loading,
.article-not-found {
  text-align: center;
  padding: 4rem 2rem;
}

.article-loading p,
.article-not-found p {
  color: var(--text-secondary);
  font-size: 1.25rem;
  margin-top: 1rem;
}

.article-not-found h1 {
  font-size: 4rem;
  margin-bottom: 1rem;
}

.article-header {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 2px solid var(--border-color);
}

.article-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.article-category {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--gradient-primary);
  color: white;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
}

.article-date,
.article-readtime {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.article-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.article-body {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.article-body h2 {
  font-size: 2rem;
  margin: 2.5rem 0 1.25rem;
  color: var(--text-primary);
  font-weight: 700;
}

.article-body h3 {
  font-size: 1.5rem;
  margin: 2rem 0 1rem;
  color: var(--text-primary);
  font-weight: 600;
}

.article-body p {
  margin-bottom: 1.5rem;
}

.article-body ul,
.article-body ol {
  margin: 1.5rem 0;
  padding-left: 2rem;
}

.article-body li {
  margin-bottom: 0.75rem;
}

.article-body strong {
  color: var(--primary-color);
  font-weight: 600;
}

.article-body code {
  background-color: var(--bg-tertiary);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: "Courier New", monospace;
}

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

.article-share h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.share-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.share-btn {
  padding: 0.75rem 1.5rem;
  border: 2px solid var(--border-color);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 500;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.share-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.share-btn.twitter:hover {
  background-color: #1da1f2;
  border-color: #1da1f2;
  color: white;
}

.share-btn.facebook:hover {
  background-color: #1877f2;
  border-color: #1877f2;
  color: white;
}

.share-btn.linkedin:hover {
  background-color: #0a66c2;
  border-color: #0a66c2;
  color: white;
}

.share-btn.copy:hover {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
}

/* ============================================
   響應式設計 - 新頁面
   ============================================ */
@media (max-width: 768px) {
  .page-title {
    font-size: 2rem;
  }

  .page-subtitle {
    font-size: 1rem;
  }

  .articles-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-group,
  .sort-group {
    width: 100%;
    justify-content: space-between;
  }

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

  .article-content {
    padding: 2rem 1.5rem;
  }

  .article-title {
    font-size: 1.75rem;
  }

  .article-body {
    font-size: 1rem;
  }

  .share-buttons {
    flex-direction: column;
  }

  .share-btn {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .page-header {
    padding: 3rem 0 2rem;
  }

  .page-title {
    font-size: 1.75rem;
  }

  .article-title {
    font-size: 1.5rem;
  }

  .article-body h2 {
    font-size: 1.5rem;
  }

  .article-body h3 {
    font-size: 1.25rem;
  }
}