:root {
    --bg: #fffdfc;
    --text: #1a2b3c;
    --text-muted: #5a6b7d;
    --accent: #c65d4a;
    --box-math-bg: #eef2f6;
    --box-ml-bg: #fcf6f1;
    --border: #e6e9ed;
    --font-main: 'Plus Jakarta Sans', sans-serif;
    --font-mono: 'Space Mono', monospace;
}

* { box-sizing: border-box; }

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: var(--font-main);
    line-height: 1.65;
    margin: 0;
    display: flex;
    flex-direction: column;
    height: 100vh;
}

header {
    background-color: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 20px; 
}

.cat-btn {
    background: none; border: none; font-size: 1rem; font-weight: 600;
    color: var(--text-muted); cursor: pointer; border-bottom: 2px solid transparent;
    text-decoration: none; padding-bottom: 2px; 
}

.cat-btn:hover { color: var(--accent); }
.cat-btn.active-cat { color: var(--accent); border-bottom: 2px solid var(--accent); }

.category-nav { display: flex; gap: 20px; align-items: center; }

.lang-switch button {
    border: 1px solid var(--border); background: none; padding: 5px 10px;
    cursor: pointer; font-weight: 600;
}
.lang-switch button:hover { color: var(--accent); }

/* DYNAMIC LAYOUT SUPPORT */
.main-container {
    display: grid;
    grid-template-columns: 280px 1fr;
    flex-grow: 1;
    overflow: hidden;
}
.main-container.home-active { grid-template-columns: 1fr; }

.sidebar { background-color: var(--box-ml-bg); border-right: 1px solid var(--border); padding: 20px; overflow-y: auto; }
.main-container.home-active .sidebar { display: none; }

.note-list button { width: 100%; text-align: left; border: none; background: none; padding: 8px; cursor: pointer; }
.note-list button.active-note { background-color: var(--accent); color: white; }

.content { padding: 40px; overflow-y: auto; }

/* ===== HOME DASHBOARD STYLES ===== */
.home-dashboard {
    display: none;
    max-width: 1100px;
    margin: 0 auto;
    flex-direction: column; 
    min-height: 100%;
}
.main-container.home-active .home-dashboard { display: flex; }
.main-container.home-active #markdown-content { display: none; }

.dashboard-content-wrapper {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
    flex-grow: 1; 
    padding-bottom: 40px;
}

.dashboard-header { margin-bottom: 30px; }
.dashboard-header h1 { font-size: 2.2rem; margin: 0 0 10px 0; color: var(--text); }
.dashboard-header p { font-size: 1.05rem; color: var(--text-muted); margin: 0; }

/* ===== INTERACTIVE TREE STYLES ===== */
.tree-container { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 25px 30px; }
.tree-root { font-size: 1.2rem; font-weight: 700; color: var(--text); margin-bottom: 20px; display: flex; align-items: center; gap: 10px; }
.tree-root::before { content: '📁'; font-size: 1.4rem; }

.tree-branch { border-left: 2px solid var(--border); margin-left: 10px; padding-left: 20px; margin-bottom: 20px; position: relative; }
.tree-branch::before { content: ''; position: absolute; left: 0; top: 15px; width: 15px; height: 2px; background: var(--border); }
.tree-category { font-weight: 600; font-size: 1.05rem; cursor: pointer; display: inline-block; padding: 4px 8px; border-radius: 6px; transition: all 0.2s; color: var(--accent); }
.tree-category:hover { background: var(--box-ml-bg); transform: translateX(3px); }

.tree-leaves { margin-top: 10px; border-left: 2px solid var(--border); margin-left: 10px; padding-left: 20px; }
.tree-leaf-item { position: relative; margin-bottom: 10px; }
.tree-leaf-item::before { content: ''; position: absolute; left: -20px; top: 12px; width: 15px; height: 2px; background: var(--border); }
.tree-leaf { color: var(--text-muted); cursor: pointer; display: inline-block; padding: 2px 8px; border-radius: 4px; transition: all 0.2s; font-size: 0.95rem; }
.tree-leaf:hover { background: var(--box-math-bg); color: var(--text); transform: translateX(3px); font-weight: 500; }
.tree-leaf::before { content: '📄 '; font-size: 0.85rem; opacity: 0.6; }

/* ===== UPDATES COLUMN ===== */
.updates-column { background: var(--box-math-bg); border-radius: 12px; padding: 25px; border: 1px solid var(--border); }
.updates-column h3 { margin: 0 0 20px 0; font-size: 1.1rem; border-bottom: 2px solid var(--border); padding-bottom: 10px; }
.update-item { margin-bottom: 15px; }
.update-date { font-family: var(--font-mono); font-size: 0.8rem; color: var(--accent); display: block; margin-bottom: 3px; }
.update-text { font-size: 0.95rem; line-height: 1.4; }

/* ===== MINIMAL FOOTER ===== */
.dynamic-home-footer {
    padding: 20px 10px; margin-top: 40px; border-top: 1px solid var(--border);
    font-size: 0.75rem; color: var(--text-muted); font-family: var(--font-mono);
    text-align: center; display: flex; flex-direction: column; align-items: center;
    gap: 8px; background: var(--bg);
}

.main-container:not(.home-active) .dynamic-home-footer { display: none !important; }

/* ===== Table & Markdown Styling ===== */
.markdown-body table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 0.95rem; table-layout: auto; }
.markdown-body th, .markdown-body td { border: 1px solid var(--border); padding: 12px 14px; text-align: left; vertical-align: top; line-height: 1.6; word-break: break-word; }
.markdown-body th { background-color: var(--box-ml-bg); font-weight: 600; }
.markdown-body tr:nth-child(even) { background-color: #fafafa; }
.markdown-body td:first-child, .markdown-body th:first-child { width: 140px; white-space: nowrap; }
.markdown-body { max-width:100%; margin: 0; font-size: 16px; line-height: 1.75; }

@media (max-width: 768px) {
    .content { padding: 20px; height: auto; overflow-y: visible; }
    .main-container { display: block; overflow-y: auto; height: auto; }
    body { height: auto; }
    .dashboard-content-wrapper { grid-template-columns: 1fr; }
    .markdown-body table { display: block; overflow-x: auto; }
    .category-nav { flex-wrap: wrap; gap: 10px; }
    header { flex-direction: column; align-items: flex-start; gap: 10px; }
    .sidebar { width: 100%; border-right: none; border-bottom: 1px solid var(--border); padding: 10px; }
    .note-list { display: flex; overflow-x: auto; gap: 8px; }
    .note-list li { flex: 0 0 auto; }
    .note-list button { white-space: nowrap; border: 1px solid var(--border); border-radius: 20px; padding: 6px 12px; }
    .markdown-body { max-width: 100%; }
}

.markdown-body h1 { font-size: 2rem; margin-top: 0; border-bottom: 1px solid var(--border); padding-bottom: 8px; }
.markdown-body h2 { margin-top: 32px; font-size: 1.5rem; }
.markdown-body h3 { margin-top: 24px; }
.markdown-body p { margin: 14px 0; }
.markdown-body ul { padding-left: 20px; }
.markdown-body blockquote { border-left: 3px solid var(--accent); padding-left: 12px; color: var(--text-muted); background: var(--box-ml-bg); border-radius: 6px; }
.markdown-body code { background: var(--box-math-bg); padding: 3px 6px; border-radius: 4px; font-size: 0.9em; }
.markdown-body pre { background: #1a2b3c; color: white; padding: 16px; border-radius: 8px; overflow-x: auto; }
.katex-display { margin: 20px 0; overflow-x: auto; }
html { scroll-behavior: smooth; }


/* 針對markdown裡的html demo */
.demo-wrapper {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin: 20px 0;
}

.demo-frame {
  width: 100%;
  height: 600px;
  border: none;
  display: block;
}

@media (max-width: 768px) {
  .demo-frame {
    height: 80vw;
  }
}

/* 針對markdown裡the width of math equations */
.MathJax_Display, .katex-display, mjx-container, .math-display, .math {
    max-width: 100%;
    overflow-x: auto !important;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 5px;
}