:root {
    --bg-color: #fcfbf9;
    --text-color: #2b2b2b;
    --text-muted: #767676;
    --border-color: #eae6df;
    --accent-color: #8c2d19;
    --card-bg: #ffffff;
    --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", SimHei, serif;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-serif);
    line-height: 1.85;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 780px;
    margin: 0 auto;
    padding: 40px 20px 80px 20px;
}

header {
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 30px;
    margin-bottom: 40px;
}

.site-title {
    font-size: 2.2rem;
    font-weight: 700;
    letter-spacing: 2px;
    margin: 0;
    color: #1a1a1a;
}

.site-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-top: 8px;
    font-family: var(--font-sans);
}

nav {
    margin-top: 25px;
    display: flex;
    justify-content: center;
    gap: 24px;
}

nav button {
    background: none;
    border: none;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 6px 12px;
    border-radius: 4px;
    transition: all 0.2s;
}

nav button.active, nav button:hover {
    color: var(--accent-color);
    background-color: #f1ede6;
    font-weight: 600;
}

/* 时间线 */
.timeline {
    border-left: 2px solid var(--border-color);
    margin: 30px 0 50px 20px;
    padding-left: 25px;
}
.timeline-item {
    position: relative;
    margin-bottom: 25px;
}
.timeline-item::before {
    content: "";
    position: absolute;
    left: -32px;
    top: 6px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent-color);
}
.timeline-year {
    font-weight: bold;
    color: var(--accent-color);
    font-family: var(--font-sans);
    font-size: 0.9rem;
}

/* 文章卡片 */
.article-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 24px 28px;
    margin-bottom: 25px;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.article-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.04);
}
.article-card h2 {
    margin: 0 0 8px 0;
    font-size: 1.4rem;
    color: #1a1a1a;
}
.article-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-family: var(--font-sans);
    margin-bottom: 12px;
}
.article-excerpt {
    color: #555;
    font-size: 0.95rem;
    margin: 0;
}

/* 文章详情 */
.article-detail {
    display: none;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 35px 35px 50px 35px;
}
.back-btn {
    background: none;
    border: 1px solid var(--border-color);
    padding: 6px 14px;
    border-radius: 4px;
    cursor: pointer;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    margin-bottom: 25px;
}
.back-btn:hover {
    border-color: var(--text-muted);
}
.article-detail h1 {
    font-size: 1.8rem;
    margin-bottom: 10px;
    line-height: 1.35;
}
.article-detail .subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 20px;
}
.content p {
    margin: 1.4em 0;
    font-size: 1.05rem;
    text-align: justify;
}

/* 互动栏 */
.interaction-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px dashed var(--border-color);
    border-bottom: 1px dashed var(--border-color);
    padding: 15px 0;
    margin: 40px 0 30px 0;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    color: var(--text-muted);
}
.like-btn {
    background: #fff;
    border: 1px solid #d9534f;
    color: #d9534f;
    padding: 6px 18px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}
.like-btn:hover {
    background: #d9534f;
    color: #fff;
}

/* 评论区 */
.comments-section {
    margin-top: 30px;
    font-family: var(--font-sans);
}
.comment-form input, .comment-form textarea {
    width: 100%;
    box-sizing: border-box;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-bottom: 12px;
    font-family: inherit;
    font-size: 0.95rem;
    background: #faf9f7;
}
.comment-form button {
    background: #2b2b2b;
    color: #fff;
    border: none;
    padding: 8px 20px;
    border-radius: 4px;
    cursor: pointer;
}
.comment-list {
    margin-top: 30px;
}
.comment-item {
    border-bottom: 1px solid var(--border-color);
    padding: 12px 0;
}
.comment-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}
.comment-body {
    font-size: 0.95rem;
    color: #333;
}