/* ===== 吃饺子 · Uiverse Enhanced ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --bg: #f7f9fc;
    --card: rgba(255,255,255,0.72);
    --card-hover: rgba(255,255,255,0.88);
    --text: #2c3e50;
    --text-secondary: #5a6a7e;
    --text-muted: #8899aa;
    --heading: #1a2332;
    --border: rgba(0,0,0,0.05);
    --border-hover: rgba(79,172,254,0.35);
    --nav-bg: rgba(247,249,252,0.7);
    --nav-link: #546778;
    --code-bg: rgba(0,0,0,0.04);
    --code-border: rgba(0,0,0,0.06);
    --tag-bg: rgba(79,172,254,0.08);
    --tag-text: #3b8fd4;
    --divider: rgba(0,0,0,0.05);
    --highlight: rgba(79,172,254,0.06);
    --grad-1: #4facfe;
    --grad-2: #00c6ff;
    --grad-3: #7367f0;
    --shadow: 0 4px 24px rgba(0,0,0,0.06);
    --shadow-hover: 0 8px 32px rgba(79,172,254,0.12);
    --glow: 0 0 20px rgba(79,172,254,0.15);
    --table-border: rgba(0,0,0,0.08);
    --table-head-bg: rgba(0,0,0,0.03);
    --blockquote-border: #4facfe;
    --toggle-bg: #e0e5ec;
}

[data-theme="dark"] {
    --bg: #0a0a1a;
    --card: rgba(16,20,36,0.65);
    --card-hover: rgba(20,26,46,0.85);
    --text: #c4d0dc;
    --text-secondary: #8899b0;
    --text-muted: #5a6d80;
    --heading: #e4ecf4;
    --border: rgba(100,160,220,0.08);
    --border-hover: rgba(100,160,220,0.3);
    --nav-bg: rgba(10,10,26,0.75);
    --nav-link: #788898;
    --code-bg: rgba(255,255,255,0.04);
    --code-border: rgba(255,255,255,0.06);
    --tag-bg: rgba(79,172,254,0.12);
    --tag-text: #6db8fe;
    --divider: rgba(100,160,220,0.06);
    --highlight: rgba(79,172,254,0.04);
    --shadow: 0 4px 24px rgba(0,0,0,0.3);
    --shadow-hover: 0 8px 32px rgba(79,172,254,0.18);
    --glow: 0 0 24px rgba(79,172,254,0.2);
    --table-border: rgba(100,160,220,0.08);
    --table-head-bg: rgba(100,160,220,0.04);
    --blockquote-border: #4facfe;
    --toggle-bg: #1a1e2e;
}

html { scroll-behavior: smooth; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', sans-serif;
    -webkit-font-smoothing: antialiased;
    line-height: 1.75;
    transition: background 0.5s, color 0.5s;
    min-height: 100vh;
}

canvas { position: fixed; top: 0; left: 0; z-index: 0; pointer-events: none; }

/* ===== Nav ===== */
nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    display: flex; align-items: center; justify-content: space-between;
    padding: 12px 40px;
    background: var(--nav-bg);
    backdrop-filter: blur(24px) saturate(160%);
    -webkit-backdrop-filter: blur(24px) saturate(160%);
    border-bottom: 1px solid var(--divider);
    transition: all 0.5s;
}
nav .logo {
    font-size: 1.2rem; font-weight: 800; letter-spacing: 2px;
    background: linear-gradient(135deg, var(--grad-1), var(--grad-2), var(--grad-3));
    background-size: 200% 100%;
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    animation: logoShine 4s ease infinite;
}
@keyframes logoShine {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}
nav .right { display: flex; align-items: center; gap: 28px; }
nav .nav-links { display: flex; gap: 24px; }
nav .nav-links a {
    color: var(--nav-link); text-decoration: none;
    font-size: 0.85rem; transition: all 0.3s; font-weight: 500;
    position: relative; padding: 4px 0;
}
nav .nav-links a::after {
    content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px;
    background: linear-gradient(90deg, var(--grad-1), var(--grad-2));
    transition: width 0.3s; border-radius: 1px;
}
nav .nav-links a:hover { color: var(--grad-1); }
nav .nav-links a:hover::after { width: 100%; }

/* Uiverse Theme Toggle */
.theme-toggle {
    width: 56px; height: 30px; border-radius: 15px;
    background: var(--toggle-bg); border: 2px solid var(--border);
    cursor: pointer; position: relative; transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}
.theme-toggle::before {
    content: ''; position: absolute; top: 2px; left: 2px;
    width: 24px; height: 22px; border-radius: 12px;
    background: linear-gradient(135deg, var(--grad-1), var(--grad-2));
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 8px rgba(79,172,254,0.3);
}
[data-theme="dark"] .theme-toggle::before { left: 28px; }
.theme-toggle .icon-sun, .theme-toggle .icon-moon {
    position: absolute; top: 50%; transform: translateY(-50%);
    font-size: 0.7rem; transition: all 0.4s; line-height: 1;
}
.theme-toggle .icon-sun { left: 6px; opacity: 1; }
.theme-toggle .icon-moon { right: 6px; opacity: 0.3; }
[data-theme="dark"] .theme-toggle .icon-sun { opacity: 0.3; }
[data-theme="dark"] .theme-toggle .icon-moon { opacity: 1; }
.theme-toggle:hover { box-shadow: var(--glow); }

/* ===== Main Layout ===== */
main { position: relative; z-index: 1; max-width: 720px; margin: 0 auto; padding: 100px 24px 60px; }
article { padding: 20px 0; }

/* ===== Blog Header ===== */
.blog-header {
    text-align: center; padding: 60px 0 48px;
    position: relative;
}
.avatar {
    width: 72px; height: 72px; margin: 0 auto 20px; border-radius: 50%;
    background: linear-gradient(135deg, var(--grad-1), var(--grad-2));
    display: flex; align-items: center; justify-content: center;
    font-size: 2rem;
    box-shadow: 0 4px 20px rgba(79,172,254,0.25);
    animation: float 3s ease-in-out infinite;
}
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}
.blog-header h1 {
    font-size: 1.8rem; font-weight: 800; color: var(--heading);
    letter-spacing: 1px; margin-bottom: 10px;
}
.blog-header .bio {
    color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 20px;
}
.social { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.social a {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 8px 18px; border-radius: 20px;
    font-size: 0.82rem; color: var(--text-secondary); text-decoration: none;
    background: var(--code-bg); border: 1px solid var(--border);
    transition: all 0.3s; font-weight: 500;
}
.social a:hover {
    background: var(--highlight); border-color: var(--border-hover);
    color: var(--grad-1); transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(79,172,254,0.15);
}

/* ===== Post Cards (Uiverse Glass Morphism) ===== */
.post-list { display: flex; flex-direction: column; gap: 20px; }

.post-item {
    display: block; text-decoration: none; color: inherit;
    padding: 28px 32px; border-radius: 16px;
    background: var(--card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative; overflow: hidden;
}
.post-item::before {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(135deg, var(--grad-1), var(--grad-2));
    opacity: 0; transition: opacity 0.35s;
    border-radius: 16px; z-index: -1;
}
.post-item:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-hover);
}
.post-item:hover::before { opacity: 0.03; }
.post-date {
    font-size: 0.78rem; color: var(--text-muted);
    margin-bottom: 6px; letter-spacing: 0.5px;
}
.post-title {
    font-size: 1.15rem; font-weight: 700; color: var(--heading);
    margin-bottom: 8px; transition: color 0.3s;
}
.post-item:hover .post-title {
    background: linear-gradient(135deg, var(--grad-1), var(--grad-2));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.post-excerpt {
    font-size: 0.88rem; color: var(--text-secondary);
    line-height: 1.65; margin-bottom: 14px;
}
.post-meta { display: flex; gap: 8px; flex-wrap: wrap; }

.tag {
    display: inline-block; padding: 3px 12px; border-radius: 12px;
    font-size: 0.72rem; font-weight: 600; letter-spacing: 0.5px;
    background: var(--tag-bg); color: var(--tag-text);
    border: 1px solid transparent; transition: all 0.25s;
}
.post-item:hover .tag {
    border-color: rgba(79,172,254,0.15);
}

/* ===== Pagination ===== */
.pagination {
    text-align: center; padding: 40px 0 20px;
    color: var(--text-muted); font-size: 0.85rem;
}

/* ===== Footer ===== */
footer {
    position: relative; z-index: 1; text-align: center;
    padding: 40px 24px; border-top: 1px solid var(--divider);
    color: var(--text-muted); font-size: 0.82rem;
}
footer a { color: var(--text-secondary); text-decoration: none; transition: color 0.3s; }
footer a:hover { color: var(--grad-1); }

/* ===== Article Page ===== */
.article-header { margin-bottom: 36px; text-align: center; }

.back-link {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 6px 16px; margin-bottom: 24px; border-radius: 20px;
    font-size: 0.82rem; color: var(--text-secondary); text-decoration: none;
    background: var(--code-bg); border: 1px solid var(--border);
    transition: all 0.3s; font-weight: 500;
}
.back-link:hover {
    background: var(--highlight); border-color: var(--border-hover);
    color: var(--grad-1); box-shadow: var(--shadow);
}

.article-header h1 {
    font-size: 1.7rem; font-weight: 800; color: var(--heading);
    margin-bottom: 10px; line-height: 1.4;
}
.article-header .meta {
    color: var(--text-muted); font-size: 0.85rem;
}

.content {
    font-size: 0.95rem; line-height: 1.85; color: var(--text);
}
.content h2 {
    font-size: 1.25rem; margin: 36px 0 14px; color: var(--heading);
    font-weight: 700; padding-bottom: 8px;
    border-bottom: 2px solid var(--divider);
}
.content h3 {
    font-size: 1.05rem; margin: 24px 0 10px; color: var(--heading); font-weight: 600;
}
.content p { margin: 12px 0; }
.content ul, .content ol { margin: 12px 0; padding-left: 24px; }
.content li { margin: 6px 0; }
.content strong { color: var(--heading); font-weight: 600; }
.content a { color: var(--grad-1); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color 0.3s; }
.content a:hover { border-bottom-color: var(--grad-1); }

/* Code blocks */
.content code {
    background: var(--code-bg); border: 1px solid var(--code-border);
    padding: 2px 6px; border-radius: 4px; font-size: 0.85em;
    font-family: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
}
.content pre {
    background: var(--code-bg); border: 1px solid var(--code-border);
    padding: 16px 20px; border-radius: 10px; margin: 16px 0;
    overflow-x: auto; font-size: 0.82em; line-height: 1.6;
}
.content pre code {
    background: none; border: none; padding: 0; font-size: inherit;
}

.content blockquote {
    border-left: 3px solid var(--blockquote-border);
    margin: 16px 0; padding: 12px 20px;
    background: var(--highlight); border-radius: 0 8px 8px 0;
    color: var(--text-secondary);
}
.content img { max-width: 100%; border-radius: 10px; margin: 16px 0; }
.content table {
    width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 0.88rem;
}
.content th {
    background: var(--table-head-bg); padding: 10px 14px; text-align: left;
    font-weight: 600; color: var(--heading); border: 1px solid var(--table-border);
}
.content td {
    padding: 10px 14px; border: 1px solid var(--table-border); color: var(--text-secondary);
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
    nav { padding: 10px 16px; }
    nav .nav-links { gap: 16px; }
    nav .nav-links a { font-size: 0.78rem; }
    .right { gap: 16px; }
    main { padding: 88px 16px 40px; }
    .blog-header { padding: 36px 0 32px; }
    .blog-header h1 { font-size: 1.4rem; }
    .post-item { padding: 20px 20px; }
    .post-title { font-size: 1.05rem; }
    .article-header h1 { font-size: 1.35rem; }
    .content { font-size: 0.9rem; }
}