/* ==========================================
   Suguru Osako Inspired Monochrome Style
   (Global Stylesheet - Fixed Top Nav)
   ========================================== */

/* 引入 Google Fonts (JetBrains Mono 點綴用) */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@500;600&display=swap');

/* 全域設定 */
body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: #2D3748;
  margin: 0;
  background-color: #F8F9FA; /* 冷冽高級灰白底色 */
  -webkit-font-smoothing: antialiasing; /* 讓字體邊緣纖細銳利 */
  -moz-osx-font-smoothing: grayscale;
}

/* 頂部導航欄 (Top Navigation Bar 修復版) */
.top-nav {
  display: flex !important;
  justify-content: space-between !important;
  align-items: center !important;
  border-bottom: 1px solid #E2E8F0;
  background: rgba(248, 249, 250, 0.95);
  backdrop-filter: blur(8px);
  max-width: 1300px;
  margin: 0 auto;
  padding: 20px 40px;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.nav-left {
  flex: 0 0 325px;
  display: flex;
  flex-direction: column;
}

.nav-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: #1A202C;
  margin: 0;
  letter-spacing: -0.02em;
}

.nav-title {
  font-size: 0.85rem;
  color: #718096;
  margin: 2px 0 0 0;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.nav-right {
  flex: 1;
  display: flex !important;
  justify-content: flex-start !important;
  align-items: center !important;
  gap: 30px;
}

.nav-right a {
  color: #718096 !important;
  text-decoration: none !important;
  font-size: 0.95rem;     
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: color 0.2s ease;
  position: relative;
  padding: 5px 0;
}

.nav-right a:hover,
.nav-right a.active {
  color: #1A202C !important;
}

/* Hover 與 Active 底線效果 */
.nav-right a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: #1A202C;
  transition: all 0.25s ease-in-out;
  transform: translateX(-50%);
}

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

/* 深色模式切換按鈕樣式 */
.theme-toggle-btn {
  background: none !important;
  border: none !important;
  color: #718096 !important;
  font-size: 1.05rem;
  cursor: pointer;
  padding: 4px 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s ease, transform 0.2s ease;
  margin-left: 10px;
}

.theme-toggle-btn:hover {
  color: #1A202C !important;
  transform: scale(1.1);
}

/* ==========================================
   共用頁面框架 (Home, Experience, Publications, Beyond)
   ========================================== */

.experience-container {
  max-width: 1200px;
  margin: 3rem auto 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  column-gap: 2.5rem;
}

/* 側邊欄卡片化 */
.experience-sidebar {
  background: #FFFFFF;
  border-radius: 10px;
  padding: 2rem;
  height: fit-content;
  position: sticky;
  top: 120px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
  border: 1px solid rgba(226, 232, 240, 0.8);
}

.sidebar-profile-pic {
  width: 180px;
  height: 180px;
  border-radius: 12px;
  object-fit: cover;
  object-position: center 20%;
  display: block;
  margin: 0 auto 1.5rem auto;
  border: 3px solid #F8F9FA;
}

.sidebar-profile-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  color: #1A202C;
  letter-spacing: -0.02em;
  text-align: center;
}

.sidebar-profile-title {
  color: #718096;
  margin-bottom: 2rem;
  font-size: 0.85rem;
  line-height: 1.5;
  text-align: center;
  font-weight: 500;
  letter-spacing: 0.03em;
  font-family: 'JetBrains Mono', monospace;
}

.sidebar-contact-info {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-contact-info li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.8rem;
  font-size: 0.9rem;
  color: #4A5568;
}

.sidebar-contact-info i {
  width: 20px;
  color: #718096;
}

.sidebar-contact-info a {
  color: #4A5568;
  text-decoration: none;
  transition: color 0.2s ease;
}

.sidebar-contact-info a:hover {
  color: #1A202C;
  text-decoration: underline;
}

/* 主內容區卡片化 */
.experience-content {
  background: #FFFFFF;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
  border: 1px solid rgba(226, 232, 240, 0.8);
  overflow: hidden;
  padding: 2.5rem;
}

.experience-content-header {
  background: #1A202C;
  color: #FFFFFF;
  padding: 1.25rem 2.5rem;
  margin: -2.5rem -2.5rem 2.5rem -2.5rem;
}

.experience-content-header h2 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.experience-section-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  margin-top: 2rem;
  color: #1A202C;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid #E2E8F0;
  letter-spacing: -0.02em;
}

.experience-section-title:first-of-type {
  margin-top: 0;
}

/* 時間與數據標籤 */
.date-tag, .duration {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  color: #718096;
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* 按鈕元件 (4px 俐落微直角) */
.cv-btn-container {
  margin-top: 1.5rem;
  margin-bottom: 2rem;
}

.cv-button, .social-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: #1A202C;
  color: #FFFFFF !important;
  padding: 0.65rem 1.25rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.01em;
  text-decoration: none !important;
  transition: all 0.2s ease-in-out;
  box-shadow: 0 2px 4px rgba(0,0,0,0.06);
}

.social-btn {
  background-color: #F8F9FA;
  color: #1A202C !important;
  border: 1px solid #E2E8F0;
  padding: 0.55rem 1.1rem;
}

.cv-button:hover, .social-btn:hover {
  background-color: #2D3748;
  color: #FFFFFF !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(0,0,0,0.12);
}

.inline-link {
  color: #1A202C;
  font-weight: 600;
  text-decoration: underline;
  transition: color 0.2s ease;
}

.inline-link:hover {
  color: #718096;
}

/* 底部區域 */
.footer {
  background: #F8F9FA;
  border-top: 1px solid #E2E8F0;
  padding: 30px 0;
  margin-top: 40px;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.last-update,
.copyright {
  color: #A0AEC0;
  font-size: 0.85rem;
}

.copyright {
  padding-top: 10px;
  border-top: 1px solid #E2E8F0;
}

/* RWD 排版 */
@media (max-width: 768px) {
  .top-nav {
    flex-direction: column !important;
    align-items: flex-start !important;
    padding: 15px 20px;
  }
  
  .nav-left {
    margin-left: 0;
    flex: 0 0 auto;
  }
  
  .nav-right {
    margin-top: 12px;
    gap: 15px;
    flex-wrap: wrap;
  }
  
  .experience-container {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 0 1rem;
  }

  .experience-sidebar {
    position: static;
  }

  .experience-content {
    padding: 1.5rem;
  }
}