/* =============================================
   ideaHub — 全域樣式表 (2026版)
   ============================================= */

/* --- CSS 變數 (主題設定) --- */
:root {
    --bg-color: #FAF9F6;
    --text-color: #292929;
    --primary-green: #2D5A27;
    --accent-green: #E8F3E8;
    --secondary-text: #6B6B6B;
    --border-color: #e0e0e0;
    --card-bg: #ffffff;
    --shadow-sm: 0 2px 12px rgba(45, 90, 39, 0.08);
    --shadow-md: 0 10px 25px rgba(45, 90, 39, 0.12);
    --max-width: 720px;
    --font-body: 'Noto Sans TC', system-ui, sans-serif;
    --font-serif: 'Noto Serif TC', Georgia, serif;
    --font-size-base: 1.1rem;
}

/* --- 基底重置與全域樣式 --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    line-height: 1.8;
    padding: 0 20px;
}

/* --- 導覽列 --- */
nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 40px 0 50px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    font-family: var(--font-serif);
    font-size: 1.65rem;
    color: var(--primary-green);
    text-decoration: none;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 28px;
    font-size: 1.02rem;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.25s ease;
}

.nav-links a:hover,
.nav-links a:focus {
    color: var(--primary-green);
}

/* --- 主要容器（非文章頁用） --- */
main {
    max-width: var(--max-width);
    margin: 0 auto;
}

/* --- 文章標頭與 Meta --- */
.post-header {
    margin-bottom: 48px;
}

h1 {
    font-family: var(--font-serif);
    font-size: 2.55rem;
    line-height: 1.25;
    margin-bottom: 16px;
    font-weight: 700;
}

.post-meta {
    color: var(--secondary-text);
    font-size: 0.92rem;
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
}

.post-meta span {
    display: inline-flex;
    align-items: center;
}

/* --- 文章內容 --- */
.post-content {
    max-width: 720px;
    margin: 60px auto 0;
    font-size: var(--font-size-base);
    line-height: 1.85;
    text-align: justify;
}

.post-content p {
    margin-bottom: 34px;
}

.post-content h3 {
    font-family: var(--font-serif);
    font-size: 1.28rem;
    color: var(--primary-green);
    margin: 52px 0 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--accent-green);
}

.post-content ul {
    list-style: none;
    margin: 0 0 26px 0;
    padding: 0;
}

.post-content ul li {
    padding: 6px 0 6px 1.4em;
    position: relative;
}

.post-content ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-green);
    font-weight: bold;
}

/* 有序清單 */
.post-content ol {
    padding-left: 1.8em;
    margin: 0 0 26px 0;
}

.post-content ol li {
    padding: 6px 0;
    line-height: 1.8;
}

/* Blockquote 樣式（Medium 風格） */
.post-content blockquote {
    border-left: 5px solid var(--primary-green);
    background: var(--accent-green);
    padding: 28px 32px;
    margin: 40px 0;
    border-radius: 0 8px 8px 0;
    color: #3f3f3f;
    font-size: 1.05rem;
    line-height: 1.75;
}

/* --- 表格樣式 --- */
.post-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 32px 0;
    font-size: 0.97rem;
}

.post-content th,
.post-content td {
    border: 1px solid var(--border-color);
    padding: 12px 16px;
    text-align: left;
    vertical-align: top;
}

.post-content th {
    background: var(--accent-green);
    color: var(--primary-green);
    font-weight: 600;
    font-family: var(--font-serif);
}

.post-content tr:nth-child(even) td {
    background: #f9f9f7;
}

/* --- 現代標籤樣式 --- */
.keywords {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 28px 0 32px;
}

.keywords span {
    background: var(--accent-green);
    color: var(--primary-green);
    font-size: 0.86rem;
    padding: 6px 14px;
    border-radius: 9999px;
    white-space: nowrap;
}

/* --- 文章目錄 (Table of Contents) --- */
.toc {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 24px 22px;
    box-shadow: var(--shadow-sm);
    font-size: 0.97rem;
    position: sticky;
    top: 20px;
    width: 160px;
    margin-left: calc(-160px - 30px); /* 右框線距正文左側 30px */
}

.toc h4 {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    color: var(--primary-green);
    margin-bottom: 14px;
}

.toc-title {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    color: var(--primary-green);
    margin-bottom: 6px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border-color);
    list-style: none;
}

.toc ul {
    list-style: none;
}

.toc li {
    padding: 6px 0;
}

.toc a {
    color: var(--secondary-text);
    text-decoration: none;
    transition: color 0.2s ease;
}

.toc a:hover,
.toc a:focus {
    color: var(--primary-green);
}

/* --- 近期文章卡片 --- */
.recent-posts {
    margin-top: 70px;
    padding-top: 48px;
    border-top: 1px solid var(--border-color);
}

.recent-posts h2 {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    color: var(--primary-green);
    margin-bottom: 28px;
}

.post-card {
    background: var(--card-bg);
    padding: 28px 26px;
    border-radius: 12px;
    border: 1px solid transparent;
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.post-card:last-child {
    margin-bottom: 0;
}

.post-card:hover {
    border-color: var(--accent-green);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.post-card-meta {
    font-size: 0.85rem;
    color: var(--secondary-text);
    display: flex;
    gap: 14px;
    margin-bottom: 10px;
}

.post-card h3 {
    font-family: var(--font-serif);
    font-size: 1.18rem;
    font-weight: 500;
    margin-bottom: 10px;
    line-height: 1.35;
}

.post-card h3 a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.25s ease;
}

.post-card h3 a:hover {
    color: var(--primary-green);
}

.post-card-excerpt {
    font-size: 0.96rem;
    color: var(--secondary-text);
    line-height: 1.65;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* --- 訪客計數 --- */
.visitor-stats {
    margin-top: 20px;  /* 數值越大，間隔越開 */
    background: var(--accent-green);
    padding: 8px 18px;
    border-radius: 9999px;
    font-size: 0.9rem;
    color: var(--primary-green);
}

/* 訪客統計群組 */
.visitor-stats-group {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
    margin-top: 20px;
}

/* --- 留言區 --- */
#comment-section {
    margin-top: 90px;
    padding-top: 48px;
    border-top: 1px solid var(--border-color);
}

/* --- 頁尾 --- */
footer {
    text-align: center;
    padding: 80px 0 60px;
    color: var(--secondary-text);
    font-size: 0.85rem;
    border-top: 1px solid var(--border-color);
    margin-top: 100px;
}

/* --- 響應式調整（小螢幕全域） --- */
@media (max-width: 680px) {
    h1 {
        font-size: 2.1rem;
    }

    nav {
        padding: 28px 0 40px;
        flex-direction: column;
        gap: 20px;
        align-items: flex-start;
    }

    .nav-links {
        gap: 20px;
        font-size: 1rem;
    }

    .post-card {
        padding: 24px 20px;
    }
}

/* --- Focus 可訪問性增強 --- */
a:focus-visible {
    outline: 2px solid var(--primary-green);
    outline-offset: 4px;
    border-radius: 4px;
}

/* ==================== 文章底部導航 ==================== */
.post-navigation {
    margin-bottom: 20px;
}

.nav-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    justify-content: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    border-radius: 10px;
    font-size: 1.02rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
    min-width: 160px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
}

.btn:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.btn-top      { background: var(--accent-green); color: var(--primary-green); border-color: var(--accent-green); }
.btn-primary  { background: var(--primary-green); color: white; border-color: var(--primary-green); }
.btn-secondary { background: transparent; color: var(--secondary-text); border: 1px solid var(--border-color); }

.btn-top:hover      { background: var(--primary-green); color: white; border-color: var(--primary-green); }
.btn-primary:hover  { background: #23421f; border-color: #23421f; }
.btn-secondary:hover { background: var(--accent-green); color: var(--primary-green); border-color: var(--accent-green); }

/* 喜歡這篇文章按鈕 */
.post-engagement {
    text-align: center;
    margin: 32px 0 40px;
}

.post-engagement p {
    font-size: 1.08rem;
    color: var(--secondary-text);
    margin-bottom: 14px;
}

.like-btn {
    background: var(--accent-green);
    color: var(--primary-green);
    border: none;
    padding: 14px 32px;
    font-size: 1.05rem;
    border-radius: 9999px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.like-btn:hover {
    background: var(--primary-green);
    color: white;
    transform: scale(1.05);
}

/* ==================== HackMD 風格左側 TOC 版面 ==================== */

/* 文章頁最外層容器：置中、限寬 */
.article-container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
}

/* 正文欄容器：與標題同寬置中 */
.content-layout {
    display: flex;
    align-items: flex-start;
    max-width: 720px;
    margin: 0 auto;
}

/* 左側 TOC 欄：flex 寬度為 0，不擠壓正文欄；align-self: stretch 讓高度撐滿文章，sticky 才有範圍可動 */
.toc-sidebar {
    width: 0;
    flex-shrink: 0;
    overflow: visible;
    align-self: stretch;
}

/* 右側正文欄：填滿 content-layout */
.post-main-content {
    flex: 1;
    min-width: 0;
}

/* Featured Image 與標題：在正文欄內置中，寬度一致 */
.post-header,
.featured-image {
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
}

.featured-image {
    margin: 36px auto 32px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.featured-image img {
    width: 100%;
    height: auto;
    display: block;
}

.featured-image figcaption {
    text-align: center;
    font-size: 0.9rem;
    color: var(--secondary-text);
    margin-top: 12px;
    font-style: italic;
}

/* Hashtag 關鍵字標籤列 */
.post-tags {
    margin: 32px 0 8px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.post-tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    background: var(--tag-bg, #f0f4f8);
    color: var(--secondary-text, #64748b);
    font-size: 0.82rem;
    font-weight: 500;
    letter-spacing: 0.01em;
}

/* 文末區塊 */
.post-footer {
    max-width: 720px;
    margin: 60px auto 0;
    padding-top: 20px;
}

/* ==================== 響應式 ==================== */

/* 小於 920px：sidebar 收回正文上方，所有寬度重置為全寬 */
@media (max-width: 920px) {
    .content-layout {
        max-width: 100%;
    }

    .toc-sidebar {
        width: 100%;
        overflow: hidden;
        
    }

    .toc {
        position: static;
        width: auto;
        margin-left: 0;
    }

    .post-main-content,
    .post-header,
    .featured-image,
    .post-content,
    .post-footer {
        max-width: 100%;
        margin-left: 0;
        margin-right: 0;
    }
}

/* 小於 600px：按鈕全寬堆疊 */
@media (max-width: 600px) {
    .nav-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 320px;
    }
}

/* 移除引言內最後一個段落的下邊距，防止空間重疊 */
.post-content blockquote p:last-child {
    margin-bottom: 0;
}

/* 如果你希望視覺更緊湊，可以微調 blockquote 的 padding 或 margin */
.post-content blockquote {
    padding: 28px 32px 24px; /* 稍微減少一點點底部的內邊距 */
}

/* --- 程式碼區塊樣式 --- */

/* 行內程式碼（`單行`) */
.post-content code {
    background: #f0f0ee;
    color: #2d2d2d;
    font-family: 'Cascadia Code', 'Fira Code', 'Courier New', monospace;
    font-size: 0.88em;
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid #e0e0de;
}

/* 多行程式碼區塊（``` ... ```）*/
.post-content pre {
    background: #f5f5f3;
    border: 1px solid #e0e0de;
    border-radius: 8px;
    padding: 20px 24px;
    margin: 28px 0;
    overflow-x: auto;
    line-height: 1.6;
}

/* pre 內的 code 重置行內樣式，避免雙層背景 */
.post-content pre code {
    background: none;
    border: none;
    padding: 0;
    font-size: 0.9rem;
    color: inherit;
}

/* codehilite 包裝 div（Pygments 高亮時輸出） */
.post-content .codehilite {
    background: #f5f5f3;
    border: 1px solid #e0e0de;
    border-radius: 8px;
    margin: 28px 0;
    overflow-x: auto;
}

.post-content .codehilite pre {
    background: none;
    border: none;
    border-radius: 0;
    margin: 0;
    padding: 20px 24px;
}