/* ==========================================
   莫札特主題學術網站 - 極限升級專屬樣式表 (style.css)
   ==========================================
   本樣式表專為音樂系學術風格設計，採用優雅的古典金黑色調，
   配合細緻的字體排版、完善的響應式設計與平滑的微互動。
*/

/* 引入 Google Fonts 提升排版質感 */
@import url('https://fonts.googleapis.com/css2?family=Cinzel:wght@400;600;700&family=Noto+Sans+TC:wght@300;400;500;700&family=Playfair+Display:ital,wght@0,400;0,600;0,700;1,400&display=swap');

/* ------------------------------------------
   1. 設計系統與全域變數 (Design Tokens)
   ------------------------------------------ */
:root {
  /* 配色系統：黑、金、象牙白的古典對比 */
  --bg-dark-primary: #0b0a09;    /* 極深暖黑色，用於網頁主背景 */
  --bg-dark-secondary: #161412;  /* 稍淺的深褐黑，用於區塊交替 */
  --bg-card: #201d19;            /* 卡片背景，帶有古典木質調的深褐 */
  --accent-gold: #c5a059;        /* 霧面黃金，代表高雅古典皇家質感 */
  --accent-gold-light: #e5cfa3;  /* 亮黃金，用於懸停高亮 */
  --accent-gold-glow: rgba(197, 160, 89, 0.15); /* 金色微光陰影 */
  --text-light-primary: #eae6df; /* 柔和象牙白，主文字顏色 */
  --text-light-secondary: #b8b0a0; /* 暖灰褐色，次要文字 */
  --border-gold: rgba(197, 160, 89, 0.3); /* 金色細邊框 */
  
  /* 字體宣告 */
  --font-serif: 'Playfair Display', 'Noto Sans TC', serif;
  --font-sans: 'Noto Sans TC', sans-serif;
  --font-display: 'Cinzel', serif;
  
  /* 動態轉場時間 */
  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.2s ease;
}

/* ------------------------------------------
   2. 基礎重設與滾動條優化 (Reset & Base Styles)
   ------------------------------------------ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth; /* 啟用平滑滾動 */
  font-size: 16px;
  background-color: var(--bg-dark-primary);
  color: var(--text-light-primary);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

body {
  line-height: 1.8; /* 增加行高，提升大篇幅文獻的可讀性 */
  overflow-x: hidden;
}

/* 客製化古典金色滾動條 */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-dark-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--accent-gold);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-gold-light);
}

/* ------------------------------------------
   3. 全域排版與裝飾元件 (Typography & Utilities)
   ------------------------------------------ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: 0.05em;
}

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

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

/* 學術感雙線裝飾 */
.academic-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 2.5rem 0;
}

.academic-divider::before,
.academic-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-gold), transparent);
}

.academic-divider span {
  padding: 0 15px;
  font-family: var(--font-display);
  color: var(--accent-gold);
  font-size: 1.1rem;
  letter-spacing: 0.25em;
}

/* 古典按鈕 */
.btn-classic {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  padding: 0.8rem 2rem;
  color: var(--accent-gold);
  border: 1px solid var(--accent-gold);
  background: transparent;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: var(--transition-smooth);
  text-align: center;
}

.btn-classic::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: 0.5s;
}

.btn-classic:hover::before {
  left: 100%;
}

.btn-classic:hover {
  color: var(--bg-dark-primary);
  background-color: var(--accent-gold);
  box-shadow: 0 0 15px var(--accent-gold-glow);
}

/* ------------------------------------------
   4. 玻璃擬物導覽列 (Glassmorphism Navbar)
   ------------------------------------------ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(11, 10, 9, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(197, 160, 89, 0.15);
  transition: var(--transition-smooth);
}

.navbar.scrolled {
  padding: 0.5rem 0;
  background: rgba(11, 10, 9, 0.95);
  box-shadow: 0 5px 25px rgba(0, 0, 0, 0.5);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.2rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-gold);
  letter-spacing: 0.15em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-logo span {
  font-size: 0.8rem;
  font-family: var(--font-serif);
  font-style: italic;
  opacity: 0.7;
}

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

.nav-links a {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-light-secondary);
  letter-spacing: 0.1em;
  position: relative;
  padding: 0.5rem 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 1px;
  background-color: var(--accent-gold);
  transition: var(--transition-smooth);
  transform: translateX(-50%);
}

.nav-links a:hover {
  color: var(--accent-gold-light);
}

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

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

.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--accent-gold);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ------------------------------------------
   5. 英雄視覺區 (Hero Section)
   ------------------------------------------ */
.hero {
  height: 100vh;
  min-height: 600px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 2rem;
  background: radial-gradient(circle at center, #231f1a 0%, var(--bg-dark-primary) 70%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.04;
  background-image: 
    linear-gradient(rgba(197, 160, 89, 0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(197, 160, 89, 0.3) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 900px;
  opacity: 0;
  transform: translateY(30px);
  animation: heroFadeIn 1.5s forwards cubic-bezier(0.16, 1, 0.3, 1) 0.2s;
}

.hero-subtitle {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--accent-gold);
  letter-spacing: 0.3em;
  margin-bottom: 1.5rem;
  text-transform: uppercase;
}

.hero-title {
  font-size: 4rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  line-height: 1.2;
  color: var(--text-light-primary);
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
}

.hero-title span {
  font-family: var(--font-serif);
  font-weight: 400;
  font-style: italic;
  display: block;
  font-size: 2.2rem;
  color: var(--accent-gold-light);
  margin-top: 0.5rem;
  letter-spacing: 0.05em;
}

.hero-meta {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-style: italic;
  color: var(--text-light-secondary);
  margin-bottom: 2.5rem;
}

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--text-light-secondary);
  opacity: 0.7;
}

.scroll-indicator-mouse {
  width: 20px;
  height: 35px;
  border: 2px solid var(--accent-gold);
  border-radius: 10px;
  position: relative;
}

.scroll-indicator-wheel {
  width: 4px;
  height: 8px;
  background-color: var(--accent-gold);
  border-radius: 2px;
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  animation: scrollWheel 1.5s infinite;
}

/* ------------------------------------------
   6. 通用區塊樣式 (Section Layouts)
   ------------------------------------------ */
.section-wrapper {
  padding: 8rem 2rem;
  position: relative;
}

.section-wrapper:nth-child(even) {
  background-color: var(--bg-dark-secondary);
}

.section-container {
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 4rem auto;
}

.section-tag {
  font-family: var(--font-display);
  color: var(--accent-gold);
  font-size: 0.85rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  margin-bottom: 1rem;
  display: block;
}

.section-title {
  font-size: 2.5rem;
  color: var(--text-light-primary);
  margin-bottom: 1.5rem;
  position: relative;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-light-secondary);
  font-family: var(--font-serif);
  font-style: italic;
}

/* ------------------------------------------
   7. 生平紀實時間軸 (Biography Timeline)
   ------------------------------------------ */
.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 0;
}

.timeline::after {
  content: '';
  position: absolute;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-gold) 0%, rgba(197, 160, 89, 0.1) 100%);
  top: 0;
  bottom: 0;
  left: 50%;
  margin-left: -1px;
}

.timeline-item {
  padding: 2rem 0;
  position: relative;
  width: 50%;
  opacity: 0;
  transform: translateY(40px);
  transition: var(--transition-smooth);
}

.timeline-item.revealed {
  opacity: 1;
  transform: translateY(0);
}

.timeline-item:nth-child(odd) {
  left: 0;
  padding-right: 3rem;
  text-align: right;
}

.timeline-item:nth-child(even) {
  left: 50%;
  padding-left: 3rem;
  text-align: left;
}

.timeline-badge {
  width: 16px;
  height: 16px;
  background-color: var(--bg-dark-primary);
  border: 3px solid var(--accent-gold);
  border-radius: 50%;
  position: absolute;
  top: 2.5rem;
  z-index: 10;
  transition: var(--transition-smooth);
}

.timeline-item:nth-child(odd) .timeline-badge {
  right: -8px;
}

.timeline-item:nth-child(even) .timeline-badge {
  left: -8px;
}

.timeline-item:hover .timeline-badge {
  background-color: var(--accent-gold);
  transform: scale(1.3);
  box-shadow: 0 0 10px var(--accent-gold);
}

.timeline-date {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent-gold-light);
  margin-bottom: 0.5rem;
}

.timeline-content {
  background: var(--bg-card);
  padding: 2rem;
  border-radius: 4px;
  border: 1px solid rgba(197, 160, 89, 0.1);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  transition: var(--transition-smooth);
}

.timeline-content:hover {
  transform: translateY(-5px);
  border-color: var(--accent-gold);
  box-shadow: 0 15px 35px rgba(197, 160, 89, 0.05);
}

.timeline-title {
  font-size: 1.4rem;
  color: var(--text-light-primary);
  margin-bottom: 1rem;
}

.timeline-text {
  font-size: 0.95rem;
  color: var(--text-light-secondary);
  text-align: justify;
}

.timeline-text strong {
  color: var(--accent-gold);
}

/* ------------------------------------------
   7b. 新版生平紀實時間軸：左側年份軸 + 右側文案
   ------------------------------------------ */
.timeline-v2 {
  max-width: 1000px;
  margin: 0 auto;
  padding: 1rem 0;
}

/* 每一時期的橫向行 */
.tl-row {
  display: grid;
  grid-template-columns: 160px 1fr; /* 左側年份欄寬固定 */
  gap: 0 2rem;
  position: relative;
  opacity: 0;
  transform: translateX(-30px);
  transition: var(--transition-smooth);
}

.tl-row.revealed {
  opacity: 1;
  transform: translateX(0);
}

/* 左側：年份 + 圓點 + 垂直線 */
.tl-left {
  display: flex;
  flex-direction: column;
  align-items: flex-end;  /* 年份靠右對齊 */
  padding-right: 1.5rem;  /* 給圓點留空間 */
  position: relative;
}

.tl-year {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-gold);
  letter-spacing: 0.05em;
  white-space: nowrap;
  padding-top: 0.3rem; /* 對齊標題 */
}

/* 圓點：標記在年份欄右邊緣 */
.tl-dot {
  width: 14px;
  height: 14px;
  background-color: var(--bg-dark-secondary);
  border: 2px solid var(--accent-gold);
  border-radius: 50%;
  position: absolute;
  right: -7px;  /* 超出父欄，覆蓋在分隔線上 */
  top: 0.45rem;
  z-index: 5;
  transition: var(--transition-smooth);
}

.tl-dot--gold {
  background-color: var(--accent-gold); /* 最後一期：金色實心 */
  box-shadow: 0 0 12px var(--accent-gold);
}

.tl-row:hover .tl-dot {
  background-color: var(--accent-gold);
  transform: scale(1.4);
  box-shadow: 0 0 10px var(--accent-gold);
}

/* 垂直線：連接各時期 */
.tl-line {
  width: 2px;
  flex: 1;              /* 撐滿剩餘高度 */
  min-height: 3rem;
  background: linear-gradient(180deg, var(--accent-gold) 0%, rgba(197, 160, 89, 0.2) 100%);
  position: absolute;
  right: -1px;           /* 置於圓點中心 */
  top: 1.4rem;           /* 從圓點下方開始 */
  bottom: 0;
}

/* 最後一期無垂直線 */
.tl-row--last .tl-left {
  border-right: none;
}

/* 整個左欄右側加一條金色分隔線 */
.tl-left::after {
  display: none; /* 改用 .tl-line 元素控制 */
}

/* 右側：標題 + 正文 */
.tl-right {
  background: var(--bg-card);
  border: 1px solid rgba(197, 160, 89, 0.1);
  border-radius: 4px;
  padding: 1.6rem 2rem;
  margin-bottom: 1.8rem;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
  transition: var(--transition-smooth);
}

.tl-row:hover .tl-right {
  border-color: var(--accent-gold);
  box-shadow: 0 12px 35px rgba(197, 160, 89, 0.07);
  transform: translateX(6px);
}

.tl-title {
  font-size: 1.25rem;
  color: var(--text-light-primary);
  margin-bottom: 0.9rem;
  border-left: 3px solid var(--accent-gold);
  padding-left: 0.8rem;
}

.tl-text {
  font-size: 0.93rem;
  color: var(--text-light-secondary);
  line-height: 1.8;
  text-align: justify;
}

.tl-text strong {
  color: var(--accent-gold);
}


/* ------------------------------------------
   8. 音樂特色解析區 (Musical Style)
   ------------------------------------------ */
.music-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 4rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid rgba(197, 160, 89, 0.1);
  padding: 2.5rem;
  border-radius: 4px;
  transition: var(--transition-smooth);
  position: relative;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background-color: var(--accent-gold);
  transform: scaleY(0);
  transform-origin: bottom;
  transition: var(--transition-smooth);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: rgba(197, 160, 89, 0.3);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
}

.feature-card:hover::before {
  transform: scaleY(1);
}

.feature-icon-wrapper {
  color: var(--accent-gold);
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  font-family: var(--font-display);
}

.feature-title {
  font-size: 1.3rem;
  margin-bottom: 1rem;
  color: var(--text-light-primary);
}

.feature-text {
  font-size: 0.95rem;
  color: var(--text-light-secondary);
  margin-bottom: 1.5rem;
  text-align: justify;
}

.concept-tag {
  background: rgba(197, 160, 89, 0.12);
  color: var(--accent-gold-light);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.85rem;
  cursor: help;
  border-bottom: 1px dashed var(--accent-gold);
  display: inline-block;
  margin: 2px 0;
  transition: var(--transition-fast);
}

.concept-tag:hover {
  background: rgba(197, 160, 89, 0.25);
  color: #fff;
}

/* ------------------------------------------
   9. 人格特色與共濟會區 (Personality & Freemasonry)
   ------------------------------------------ */
.personality-box {
  background: var(--bg-card);
  border: 1px solid var(--border-gold);
  border-radius: 4px;
  padding: 4rem;
  position: relative;
  overflow: hidden;
}

.personality-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 4rem;
  align-items: center;
}

.personality-content h3 {
  font-size: 1.8rem;
  color: var(--accent-gold-light);
  margin-bottom: 1.5rem;
}

.personality-quote {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.15rem;
  line-height: 1.8;
  color: var(--text-light-primary);
  margin-bottom: 2rem;
  position: relative;
  padding-left: 2rem;
  border-left: 3px solid var(--accent-gold);
}

.personality-text {
  font-size: 0.95rem;
  color: var(--text-light-secondary);
  margin-bottom: 1.5rem;
  text-align: justify;
}

.personality-text strong {
  color: var(--accent-gold);
}

.personality-masonic-symbol {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.masonic-bg {
  width: 250px;
  height: 250px;
  border: 1px solid var(--border-gold);
  transform: rotate(45deg);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.masonic-bg::after {
  content: '';
  width: 180px;
  height: 180px;
  border: 1px dashed var(--accent-gold);
  position: absolute;
}

.masonic-inner {
  transform: rotate(-45deg);
  text-align: center;
  font-family: var(--font-display);
  color: var(--accent-gold);
  font-size: 3rem;
  z-index: 2;
}

.masonic-inner span {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  margin-top: 10px;
  color: var(--text-light-secondary);
  font-family: var(--font-sans);
}

/* 人格特色區：莫札特肖像框 */
.personality-portrait {
  display: flex;
  justify-content: center;
  align-items: center;
}

.portrait-frame {
  width: 280px;
  position: relative;
  border: 2px solid var(--accent-gold);
  padding: 8px;
  background: var(--bg-card);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(197, 160, 89, 0.1);
}

/* 古典相框四角裝飾 */
.portrait-frame::before,
.portrait-frame::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  border-color: var(--accent-gold);
  border-style: solid;
}

.portrait-frame::before {
  top: -8px;
  left: -8px;
  border-width: 2px 0 0 2px;
}

.portrait-frame::after {
  bottom: -8px;
  right: -8px;
  border-width: 0 2px 2px 0;
}

.portrait-img {
  width: 100%;
  aspect-ratio: 3 / 4;        /* 固定縱向比例，像古典畫像 */
  object-fit: cover;
  object-position: center top;
  display: block;
  filter: sepia(20%) contrast(105%); /* 稍微懷舊的古典色調 */
  transition: filter 0.4s ease;
}

.portrait-frame:hover .portrait-img {
  filter: sepia(0%) contrast(110%);
}

.portrait-caption {
  text-align: center;
  padding: 0.8rem 0.5rem 0.4rem;
  border-top: 1px solid var(--border-gold);
  margin-top: 6px;
}

.portrait-name {
  display: block;
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--accent-gold);
  letter-spacing: 0.1em;
}

.portrait-years {
  display: block;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.8rem;
  color: var(--text-light-secondary);
  margin-top: 0.2rem;
}

/* ------------------------------------------
   10. 對後續音樂史的歷史影響 (Historical Legacy)
   ------------------------------------------ */
.legacy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 3rem;
}

.legacy-card {
  background: var(--bg-card);
  border: 1px solid rgba(197, 160, 89, 0.1);
  padding: 2.5rem;
  border-radius: 4px;
  transition: var(--transition-smooth);
}

.legacy-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-gold);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
}

.legacy-era {
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--accent-gold);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 0.8rem;
  display: block;
}

.legacy-title {
  font-size: 1.3rem;
  margin-bottom: 1.2rem;
  color: var(--text-light-primary);
  border-bottom: 1px solid rgba(197, 160, 89, 0.15);
  padding-bottom: 0.5rem;
}

.legacy-desc {
  font-size: 0.92rem;
  color: var(--text-light-secondary);
  text-align: justify;
}

/* ------------------------------------------
   11. 影響人物區 (Key Influential Figures)
   ------------------------------------------ */
.figures-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.2rem;
}

.figure-card {
  background: var(--bg-dark-primary);
  border: 1px solid rgba(197, 160, 89, 0.1);
  border-radius: 4px;
  overflow: hidden;
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
}

.figure-card:hover {
  transform: translateY(-8px);
  border-color: var(--accent-gold);
  box-shadow: 0 15px 35px rgba(197, 160, 89, 0.08);
}

.figure-avatar-placeholder {
  height: 180px;
  background: radial-gradient(circle at center, #2c251e 0%, #16120e 100%);
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: var(--font-display);
  font-size: 3.5rem;
  color: var(--accent-gold);
  border-bottom: 1px solid rgba(197, 160, 89, 0.15);
  position: relative;
}

.figure-avatar-placeholder::after {
  /* 當容器內無圖片時才顯示音符水印 */
  content: '𝄞';
  position: absolute;
  font-size: 8rem;
  opacity: 0.05;
  color: var(--accent-gold-light);
  pointer-events: none;
}

/* 大頭貼圖片樣式：填滿容器並裁切 */
.figure-avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;          /* 保持比例裁切填滿 */
  object-position: center top; /* 選取上半身（臉部区域） */
  display: block;
  transition: transform 0.4s ease; /* 溯游時縮放動畫 */
  position: relative;
  z-index: 1; /* 圖片畫在音符水印之上 */
}

.figure-card:hover .figure-avatar-img {
  transform: scale(1.05); /* 溯游時從容器內部出現微小的放大效果 */
}

/* 無圖備用：巴哈字母 J */
.figure-avatar-letter {
  font-family: var(--font-display);
  font-size: 3.5rem;
  color: var(--accent-gold);
  position: relative;
  z-index: 1;
}

.figure-info {
  padding: 1.2rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.figure-role {
  font-family: var(--font-display);
  font-size: 0.75rem;
  color: var(--accent-gold);
  letter-spacing: 0.15em;
  margin-bottom: 0.5rem;
  display: block;
}

.figure-name {
  font-size: 1.15rem;
  color: var(--text-light-primary);
  margin-bottom: 0.8rem;
}

.figure-bio {
  font-size: 0.85rem;
  color: var(--text-light-secondary);
  line-height: 1.6;
  text-align: justify;
}

/* ------------------------------------------
   12. 學術作品賞析區 (Selected Masterpieces)
   ------------------------------------------ */
.works-container {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 2.5rem;
  align-items: start;
}

.works-tabs {
  background: var(--bg-card);
  border: 1px solid rgba(197, 160, 89, 0.15);
  padding: 1.2rem;
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.tab-btn {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--text-light-secondary);
  background: transparent;
  border: 1px solid transparent;
  padding: 0.9rem 1.2rem;
  text-align: left;
  cursor: pointer;
  border-radius: 4px;
  transition: var(--transition-fast);
  display: flex;
  justify-content: space-between;
  align-items: center;
  line-height: 1.3;
}

.tab-btn span {
  display: block;
  font-size: 0.75rem;
  opacity: 0.6;
  font-family: var(--font-sans);
  margin-top: 2px;
}

.tab-btn span.tab-count {
  font-family: var(--font-display);
  font-size: 0.75rem;
  background: rgba(197, 160, 89, 0.1);
  color: var(--accent-gold);
  padding: 2px 8px;
  border-radius: 10px;
  margin-top: 0;
  opacity: 1;
}

.tab-btn:hover {
  background: rgba(197, 160, 89, 0.05);
  color: var(--accent-gold-light);
}

.tab-btn.active {
  background: rgba(197, 160, 89, 0.15);
  color: var(--accent-gold);
  border-color: var(--border-gold);
}

.works-list {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  min-height: 500px;
}

/* 晚期交響三部曲學術關聯區塊 */
.trilogy-box {
  background: rgba(197, 160, 89, 0.04);
  border: 1px solid var(--border-gold);
  border-radius: 4px;
  padding: 2rem;
  margin-bottom: 2rem;
}

.trilogy-box h4 {
  font-family: var(--font-display);
  color: var(--accent-gold-light);
  font-size: 1.25rem;
  margin-bottom: 1rem;
  letter-spacing: 0.15em;
  border-bottom: 1px solid rgba(197, 160, 89, 0.2);
  padding-bottom: 0.5rem;
}

.trilogy-box p {
  font-size: 0.92rem;
  color: var(--text-light-secondary);
  line-height: 1.7;
  text-align: justify;
}

/* 新增：室內樂多重奏子分類樣式 */
.chamber-sub-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--accent-gold);
  border-left: 3px solid var(--accent-gold);
  padding-left: 12px;
  margin: 2.5rem 0 1.2rem 0;
  letter-spacing: 0.15em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.chamber-sub-title span {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  font-style: italic;
  color: var(--text-light-secondary);
  font-weight: normal;
}

.work-item {
  background: var(--bg-card);
  border: 1px solid rgba(197, 160, 89, 0.1);
  border-radius: 4px;
  padding: 1.8rem;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.work-item:hover {
  border-color: var(--accent-gold);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
}

.work-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.8rem;
  flex-wrap: wrap;
  gap: 10px;
}

.work-title-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.work-k-number {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--bg-dark-primary);
  background-color: var(--accent-gold);
  padding: 2px 6px;
  border-radius: 2px;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.work-title-tw {
  font-size: 1.25rem;
  font-weight: 600;
}

.work-title-orig {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.9rem;
  color: var(--text-light-secondary);
  display: block;
}

.work-genre-tag {
  font-family: var(--font-display);
  font-size: 0.72rem;
  border: 1px solid var(--border-gold);
  color: var(--accent-gold);
  padding: 2px 8px;
  border-radius: 12px;
  white-space: nowrap;
}

.work-short-desc {
  font-size: 0.92rem;
  color: var(--text-light-secondary);
  line-height: 1.6;
}

/* 動態展開區塊樣式 */
.work-details {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.work-details.open {
  max-height: 1200px;
}

.work-details-content {
  padding-top: 1.5rem;
  border-top: 1px solid rgba(197, 160, 89, 0.1);
  margin-top: 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 2rem;
}

.academic-analysis h5,
.historical-bg h5 {
  font-family: var(--font-display);
  font-size: 0.88rem;
  color: var(--accent-gold);
  margin-bottom: 0.6rem;
  letter-spacing: 0.1em;
}

.academic-analysis p,
.historical-bg p {
  font-size: 0.88rem;
  color: var(--text-light-secondary);
  line-height: 1.7;
  text-align: justify;
}

/* ------------------------------------------
   13. 互動式名詞彈窗 (Interactive Popover)
   ------------------------------------------ */
.tooltip-popover {
  position: absolute;
  z-index: 1100;
  background: var(--bg-card);
  border: 1px solid var(--accent-gold);
  border-radius: 4px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
  padding: 1.5rem;
  max-width: 320px;
  font-size: 0.88rem;
  color: var(--text-light-primary);
  line-height: 1.6;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.3s, transform 0.3s, visibility 0.3s;
}

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

.tooltip-title {
  font-family: var(--font-display);
  color: var(--accent-gold);
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  border-bottom: 1px solid rgba(197, 160, 89, 0.2);
  padding-bottom: 0.3rem;
}

/* ------------------------------------------
   14. 頁尾設計 (Footer)
   ------------------------------------------ */
.footer {
  background-color: #080706;
  border-top: 1px solid rgba(197, 160, 89, 0.15);
  padding: 4rem 2rem 2rem 2rem;
  text-align: center;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.8rem;
  color: var(--accent-gold);
  letter-spacing: 0.2em;
  margin-bottom: 1rem;
}

.footer-quote {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1rem;
  color: var(--text-light-secondary);
  max-width: 600px;
  margin: 0 auto 2.5rem auto;
}

.footer-credits {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.25);
  letter-spacing: 0.05em;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

/* ------------------------------------------
   15. 響應式排版媒介查詢 (Media Queries)
   ------------------------------------------ */
@media (max-width: 1200px) {
  .figures-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 1024px) {
  .music-features {
    grid-template-columns: repeat(2, 1fr);
  }
  .legacy-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .works-container {
    grid-template-columns: 1fr;
  }
  .works-tabs {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
  }
  .tab-btn {
    flex: 1 1 calc(33.33% - 10px);
    min-width: 150px;
    justify-content: center;
    text-align: center;
  }
  .tab-btn span {
    display: inline;
    margin-left: 5px;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }
  
  .nav-container {
    padding: 1rem 1.5rem;
  }
  
  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: rgba(11, 10, 9, 0.98);
    border-bottom: 1px solid var(--border-gold);
    padding: 2rem;
    gap: 1.5rem;
    box-shadow: 0 10px 20px rgba(0,0,0,0.5);
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .nav-toggle {
    display: block;
  }
  
  .hero-title {
    font-size: 2.8rem;
  }
  
  .hero-title span {
    font-size: 1.6rem;
  }
  
  .timeline::after {
    left: 31px;
  }
  
  .timeline-item {
    width: 100%;
    padding-left: 4.5rem !important;
    padding-right: 0 !important;
    text-align: left !important;
  }
  
  .timeline-item:nth-child(even) {
    left: 0;
  }
  
  .timeline-badge {
    left: 23px !important;
    right: auto !important;
  }
  
  .music-features {
    grid-template-columns: 1fr;
  }
  
  .legacy-grid {
    grid-template-columns: 1fr;
  }
  
  .personality-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  
  .personality-box {
    padding: 2.5rem;
  }
  
  .figures-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .tab-btn {
    flex: 1 1 calc(50% - 10px);
  }
  
  .work-details-content {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 480px) {
  .figures-grid {
    grid-template-columns: 1fr;
  }
  .tab-btn {
    flex: 1 1 100%;
  }
}

/* ------------------------------------------
   16. 動畫定義 (Animations)
   ------------------------------------------ */
@keyframes heroFadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scrollWheel {
  0% {
    top: 6px;
    opacity: 1;
  }
  50% {
    top: 15px;
    opacity: 0.3;
  }
  100% {
    top: 6px;
    opacity: 1;
  }
}