* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    color-scheme: only light;
    --primary: #7D4A4A;
    --secondary: #8B5A52;
    --accent: #A68566;
    --border: #DCC9B6;
    --bg: #FEFDFB;
    --light-bg: #F5F0E8;
    --surface: #FFFFFF;
    --text: #4A3C3C;
    --muted: #7A6662;
    --shadow: rgba(74, 60, 60, 0.12);
}

html,
body {
    color-scheme: only light;
    background-color: var(--bg);
    color: var(--text);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Noto Sans TC", "Microsoft JhengHei", "PingFang TC", sans-serif;
    line-height: 1.7;
}

button,
input,
textarea,
select {
    color-scheme: only light;
    -webkit-appearance: none;
    appearance: none;
    font-family: inherit;
}

.container { max-width: 900px; margin: 0 auto; padding: 20px; }

header {
    background: linear-gradient(135deg, #F5F0E8, #FEFDFB);
    padding: 2.5em 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 2em;
}

h1 { font-size: 2.2em; color: var(--primary); letter-spacing: 0.05em; }
h2 { font-size: 1.5em; color: var(--primary); margin: 1.5em 0 1em; }
h3 { font-size: 1.2em; color: var(--secondary); margin-top: 1em; }

.site-subtitle { color: var(--secondary); margin-top: 0.6em; font-size: 1.05em; }
.site-description { color: var(--muted); margin-top: 1.1em; max-width: 720px; }

.view { display: none; }
.view.active { display: block; }

.author-section { margin-bottom: 2.5em; }

.author-title {
    font-size: 1.3em;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 1em;
    padding-bottom: 0.5em;
    border-bottom: 2px solid var(--accent);
}

.works-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.2em;
    margin-left: 0;
}

.work-card {
    background-color: var(--light-bg);
    color: var(--text);
    border: 2px solid var(--border);
    border-radius: 6px;
    padding: 1.5em;
    cursor: pointer;
    transition: all 0.3s;
    text-align: left;
}

.work-card:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 12px var(--shadow);
    transform: translateY(-2px);
}

.work-title { 
    font-size: 1.45em; 
    color: var(--primary); 
    font-weight: 700; 
    line-height: 1.45;
    margin-bottom: 0.5em; }
.work-info { 
    font-size: 1.05em; 
    line-height: 1.6;
    color: var(--secondary); }

    

.reader-header {
    margin-bottom: 1.5em;
    padding-bottom: 1.5em;
    border-bottom: 1px solid var(--border);
}

.back-btn {
    padding: 0.6em 1.2em;
    background-color: var(--accent);
    color: #FFFFFF;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    font-size: 0.95em;
    margin-bottom: 1em;
}

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

.chapter-label {
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: 0.8em;
}

.chapters {
    display: flex;
    gap: 0.5em;
    margin-bottom: 1.5em;
    flex-wrap: wrap;
    max-height: 120px;
    overflow-y: auto;
    padding: 0.5em;
    border: 1px solid var(--border);
    border-radius: 4px;
    background-color: var(--surface);
}

.chapter-btn {
    padding: 0.4em 0.8em;
    border: 1px solid var(--border);
    background-color: var(--surface);
    color: var(--secondary);
    cursor: pointer;
    border-radius: 3px;
    font-size: 0.85em;
    white-space: nowrap;
    transition: all 0.2s;
}

.chapter-btn.active,
.chapter-btn:hover {
    background-color: var(--accent);
    color: #FFFFFF;
    border-color: var(--accent);
}

.nav-tabs {
    display: flex;
    gap: 0.8em;
    margin-bottom: 1.5em;
    padding-bottom: 1em;
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
}

.nav-tab {
    padding: 0.6em 1.2em;
    border: 1px solid var(--border);
    background-color: var(--surface);
    color: var(--secondary);
    cursor: pointer;
    border-radius: 3px;
    transition: all 0.2s;
}

.nav-tab.active,
.nav-tab:hover {
    background-color: var(--accent);
    color: #FFFFFF;
    border-color: var(--accent);
}

.content-panel {
    background-color: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 2em;
    display: none;
    min-height: 400px;
    line-height: 2;
    letter-spacing: 0.02em;
    font-size: 1.05em;
    text-align: justify;
}

.content-panel.active { display: block; }

.content-panel p {
    margin-bottom: 1.5em;
    text-indent: 2em;
}

.content-panel p:first-child { text-indent: 0; }

.content-panel blockquote {
    margin: 1.5em 2em;
    padding: 1em 1.5em;
    border-left: 3px solid var(--accent);
    background-color: var(--light-bg);
    color: var(--secondary);
    font-style: italic;
}

/* 經證／偈頌引用：與前後文分開、獨立成塊、非斜體便於閱讀 */
.content-panel blockquote.scripture {
    margin: 1.4em 1em 1.4em 1.6em;
    padding: 0.9em 1.2em 0.9em 1.3em;
    border-left: 4px solid var(--secondary);
    border-radius: 0 8px 8px 0;
    background-color: #FBF6EE;
    color: var(--text);
    font-style: normal;
    text-indent: 0;
    line-height: 1.9;
}
.content-panel blockquote.scripture p { text-indent: 0; margin: 0; }

.content-panel h2,
.content-panel h3,
.content-panel h4,
.content-panel h5,
.content-panel h6 {
    text-indent: 0;
    margin-top: 2em;
    margin-bottom: 1em;
    scroll-margin-top: 1em;
}

.content-panel h2 {
    font-size: 1.4em;
    color: var(--primary);
    border-bottom: 2px solid var(--border);
    padding-bottom: 0.5em;
}

.content-panel h3 { font-size: 1.2em; color: var(--secondary); }
.content-panel h4 { font-size: 1.05em; color: var(--secondary); }
.content-panel h5 { font-size: 1em; color: var(--secondary); font-weight: 600; }
.content-panel h6 { font-size: 0.95em; color: var(--secondary); font-weight: 600; }

.footnote-btn {
    cursor: pointer;
    background-color: var(--accent);
    color: #FFFFFF;
    padding: 1px 4px;
    border-radius: 3px;
    font-size: 0.8em;
    margin: 0 2px;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    align-items: center;
    justify-content: center;
    padding: 1em;
}

.modal.active { display: flex; }

.modal-content {
    background-color: var(--bg);
    color: var(--text);
    padding: 2em;
    border-radius: 6px;
    max-width: 650px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    border: 1px solid var(--border);
}

.modal-header {
    font-size: 1.2em;
    color: var(--primary);
    margin-bottom: 1em;
    padding-bottom: 0.5em;
    border-bottom: 2px solid var(--accent);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.8em;
    cursor: pointer;
    color: var(--secondary);
}

.modal-body {
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.8;
    font-size: 0.95em;
    white-space: pre-wrap;
}

.toc-list { list-style: none; }
.toc-item {
    padding: 0.6em 0.8em;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
}

.toc-item:hover { background: rgba(166, 133, 102, 0.08); }
.toc-item.active { color: var(--accent); font-weight: 600; }

/* ── 科判區塊圖（目錄分頁） ── */
.kepan-root { list-style: none; padding: 0.2em 0; }
.kepan-title {
    font-size: 1.15em;
    color: var(--primary);
    font-weight: 700;
    margin: 0.2em 0 0.4em;
}
.kepan-intro {
    font-size: 0.85em;
    color: var(--secondary);
    line-height: 1.6;
    margin-bottom: 1em;
    padding-bottom: 0.8em;
    border-bottom: 1px dashed var(--border);
}
.kepan-downloads {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6em;
    margin: 0 0 1.2em;
}
.kepan-dl {
    display: inline-block;
    font-size: 0.88em;
    text-decoration: none;
    color: #FFFFFF;
    background: var(--primary);
    border: 1px solid var(--primary);
    border-radius: 6px;
    padding: 0.45em 0.9em;
    transition: opacity 0.15s;
}
.kepan-dl:hover { opacity: 0.88; }
.kepan-dl-alt {
    color: var(--primary);
    background: var(--bg);
}

.kepan-level { display: flex; flex-direction: column; gap: 0.4em; }
.kepan-node.kepan-branch { display: flex; flex-direction: column; }
.kepan-row { display: flex; align-items: stretch; gap: 0.2em; }
.kepan-row-leaf { padding-left: 1.7em; }
.kepan-row .kepan-item { flex: 1 1 auto; }

/* 子節點容器：縮排 + 連接線；收合時隱藏 */
.kepan-children {
    margin: 0.4em 0 0.1em 0.7em;
    padding-left: 0.7em;
    border-left: 2px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 0.4em;
}
.kepan-branch.collapsed > .kepan-children { display: none; }

/* 三角形展開／收合按鈕 */
.kepan-toggle {
    flex: 0 0 auto;
    width: 1.5em;
    align-self: stretch;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--accent);
    font-size: 0.85em;
    line-height: 1;
    cursor: pointer;
    padding: 0;
    transition: transform 0.15s;
}
.kepan-toggle:hover { color: var(--primary); }
.kepan-branch.collapsed > .kepan-row > .kepan-toggle { transform: rotate(-90deg); }

.kepan-item {
    display: flex;
    align-items: baseline;
    gap: 0.5em;
    width: 100%;
    text-align: left;
    padding: 0.5em 0.7em;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
    font-family: inherit;
    font-size: 0.92em;
    line-height: 1.5;
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
}
button.kepan-item:hover {
    background: var(--light-bg);
    border-color: var(--accent);
    box-shadow: 0 1px 4px rgba(125, 74, 74, 0.1);
}
/* 目前閱讀章節：淡暖底 + 左側細色條，標出所在位置但不刺眼 */
.kepan-item.active {
    background: #FAF0E4;
    border-color: var(--accent);
    box-shadow: inset 3px 0 0 var(--primary);
    color: var(--text);
}
.kepan-item.active .kepan-label { background: var(--accent); color: #FFFFFF; }

.kepan-item.kepan-group {
    cursor: default;
    background: var(--light-bg);
    border-style: dashed;
    font-weight: 600;
    color: var(--primary);
}
.kepan-head { font-weight: 600; }

.kepan-label {
    flex: 0 0 auto;
    min-width: 2.8em;
    text-align: center;
    font-size: 0.82em;
    font-weight: 700;
    color: var(--primary);
    background: var(--light-bg);
    border-radius: 5px;
    padding: 0.1em 0.4em;
}
.kepan-group .kepan-label { background: rgba(125, 74, 74, 0.1); }
.kepan-text { flex: 1 1 auto; }
.kepan-ch {
    flex: 0 0 auto;
    font-size: 0.75em;
    color: var(--accent);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.05em 0.4em;
    white-space: nowrap;
}

.loading,
.error {
    color: var(--secondary);
    padding: 1.2em;
    background-color: var(--light-bg);
    border: 1px solid var(--border);
    border-radius: 4px;
}

.error { color: #8A3A3A; }

footer {
    border-top: 1px solid var(--border);
    padding: 2em 0;
    margin-top: 3em;
    text-align: center;
    color: var(--secondary);
    font-size: 0.95em;
}

/* 返回頂部按鈕樣式 */
.back-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  padding: 12px 16px;
  background-color: var(--accent);
  color: #FFFFFF;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  display: none;
  z-index: 999;
  font-size: 14px;
  font-family: inherit;
  transition: background-color 0.3s ease, opacity 0.3s ease;
  box-shadow: 0 2px 8px var(--shadow);
}

.back-to-top:hover {
  background-color: var(--secondary);
}

.back-to-top:active {
  background-color: var(--primary);
}

.back-to-top.show {
  display: block;
  animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 768px) {
    h1 { font-size: 1.8em; }
    header { padding: 2em 0; }
    .content-panel { font-size: 1em; padding: 1.2em; }
    .content-panel p { text-indent: 0; }
    .container { padding: 16px; }
    
    .back-to-top {
      bottom: 15px;
      right: 15px;
      padding: 10px 14px;
      font-size: 12px;
    }
}

@media (prefers-color-scheme: dark) {
    html,
    body {
        background-color: #FEFDFB !important;
        color: #4A3C3C !important;
        color-scheme: only light;
    }

    header { background: linear-gradient(135deg, #F5F0E8, #FEFDFB) !important; }

    .work-card,
    .content-panel,
    .chapters,
    .chapter-btn,
    .nav-tab,
    .modal-content,
    .modal-body {
        background-color: #FFFFFF !important;
        color: #4A3C3C !important;
        border-color: #DCC9B6 !important;
    }

    .work-card,
    .loading { background-color: #F5F0E8 !important; }

    .nav-tab.active,
    .chapter-btn.active,
    .back-btn {
        background-color: #A68566 !important;
        color: #FFFFFF !important;
    }

    h1,
    h2,
    .author-title,
    .work-title,
    .modal-header { color: #7D4A4A !important; }

    h3,
    .work-info,
    footer,
    .chapter-btn,
    .nav-tab { color: #8B5A52 !important; }
}

/* 正文結尾：上一章／下一章小按鈕 */
.chapter-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    margin: 2.6em 0 0.4em;
    padding-top: 1.3em;
    border-top: 1px solid rgba(122, 92, 58, 0.18);
}

.chapter-nav-btn {
    appearance: none;
    border: 1px solid rgba(122, 92, 58, 0.35);
    border-radius: 999px;
    background: #fffaf2;
    color: #6e4f2a;
    font-size: 0.9rem;
    line-height: 1;
    padding: 8px 16px;
    cursor: pointer;
}

.chapter-nav-btn:hover,
.chapter-nav-btn:focus-visible {
    background: #f4ead8;
    outline: none;
}

.chapter-nav-spacer {
    flex: 0 0 auto;
}