/* ============================================
   OneChat Blog · 一聊博客
   Design: Clean reading-optimized layout
   ============================================ */

:root {
    --blog-bg: #F8FFFE;
    --blog-card-bg: #fff;
    --blog-accent: #0891B2;
    --blog-text: #334155;
    --blog-muted: #64748B;
    --blog-heading: #0F172A;
    --blog-border: rgba(8, 145, 178, 0.1);
    --blog-shadow: 0 4px 24px rgba(8, 145, 178, 0.06);
    --blog-radius: 16px;
    --bottom-banner-space: 72px;
}

body {
    font-family: 'Open Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--blog-bg);
    color: var(--blog-text);
    margin: 0;
    line-height: 1.8;
    padding-bottom: var(--bottom-banner-space);
}

/* ===== 导航下方广告条 ===== */
.nav-ad {
    background: linear-gradient(135deg, #F0FDFA, #E0F2FE);
    border-bottom: 1px solid rgba(8, 145, 178, 0.12);
    padding: 14px 0;
    min-height: 52px;
    font-size: 0.92rem;
}

.nav-ad-inner {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.nav-ad-inner .ad-icon { font-size: 1.1rem; }

.nav-ad-btn {
    display: inline-block;
    background: var(--blog-accent);
    color: #fff;
    padding: 5px 16px;
    border-radius: 100px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.82rem;
    white-space: nowrap;
    transition: transform 0.2s, box-shadow 0.2s;
}

.nav-ad-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 2px 8px rgba(8, 145, 178, 0.3);
}

.hero-ad {
    border-radius: 14px;
    border: 1px solid rgba(8, 145, 178, 0.12);
    margin: 18px 0 26px;
}

.hero-ad-inner {
    padding-top: 16px;
    padding-bottom: 16px;
}

.hero-ad-copy {
    display: flex;
    flex-direction: column;
    gap: 6px;
    align-items: center;
    text-align: center;
    flex: 1 1 520px;
}

.hero-ad-title {
    font-weight: 900;
    font-size: 1.15rem;
    letter-spacing: -0.02em;
    background: linear-gradient(90deg, #0E7490, #0891B2, #22D3EE, #0891B2, #0E7490);
    background-size: 220% 100%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: heroTitleShimmer 3.6s ease-in-out infinite, heroTitleBreath 2.2s ease-in-out infinite;
    will-change: transform, filter, background-position;
}

.hero-ad-desc {
    opacity: 0.95;
}

.hero-ad-actions {
    flex: 0 0 100%;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 6px;
}

@keyframes heroTitleShimmer {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes heroTitleBreath {
    0%, 100% { transform: translateY(0); filter: drop-shadow(0 0 0 rgba(8,145,178,0)); }
    50% { transform: translateY(-1px); filter: drop-shadow(0 6px 14px rgba(8,145,178,0.22)); }
}

/* ===== 底部引流通栏 ===== */
.bottom-banner {
    background: linear-gradient(135deg, #0891B2, #0E7490, #06B6D4);
    color: #fff;
    padding: 8px 0;
    font-size: 0.92rem;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 300;
    margin-top: 0;
    padding-bottom: calc(8px + env(safe-area-inset-bottom));
}

.bottom-banner-inner {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.bottom-banner-btn {
    display: inline-block;
    background: #fff;
    color: #0891B2;
    padding: 6px 18px;
    border-radius: 100px;
    text-decoration: none;
    font-weight: 700;
    font-size: 0.85rem;
    white-space: nowrap;
    transition: transform 0.2s, box-shadow 0.2s;
}

.bottom-banner-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.blog-container {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.blog-header {
    background: #fff;
    border-bottom: 1px solid var(--blog-border);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    background: rgba(255,255,255,0.9);
}

.blog-header-inner {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.blog-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--blog-heading);
}

.blog-logo .onechat { color: var(--blog-accent); }
.blog-logo .cn { 
    font-size: 0.9rem; 
    background: linear-gradient(135deg, #0891B2, #22D3EE);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 600;
}

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

.blog-nav a {
    text-decoration: none;
    color: var(--blog-muted);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

.blog-nav a:hover { color: var(--blog-accent); }

.blog-nav .cta {
    background: var(--blog-accent);
    color: #fff;
    padding: 8px 18px;
    border-radius: 100px;
    font-weight: 600;
}

.blog-nav .cta:hover {
    background: #0E7490;
    color: #fff;
}

/* Hero */
.blog-hero {
    text-align: center;
    padding: 64px 0 48px;
}

.blog-hero h1 {
    font-size: 2.2rem;
    color: var(--blog-heading);
    margin-bottom: 12px;
    letter-spacing: -0.03em;
}

.blog-hero p {
    color: var(--blog-muted);
    font-size: 1.05rem;
    max-width: 560px;
    margin: 0 auto;
}

/* Article Grid */
.article-grid {
    display: grid;
    gap: 24px;
    padding-bottom: 80px;
}

.article-card {
    background: var(--blog-card-bg);
    border-radius: var(--blog-radius);
    padding: 28px 32px;
    border: 1px solid var(--blog-border);
    box-shadow: var(--blog-shadow);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    text-decoration: none;
    color: inherit;
    display: block;
}

.article-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(8, 145, 178, 0.1);
}

.article-card .date {
    font-size: 0.8rem;
    color: var(--blog-muted);
    margin-bottom: 8px;
}

.article-card h2 {
    font-size: 1.25rem;
    color: var(--blog-heading);
    margin: 0 0 8px;
    line-height: 1.4;
}

.article-card .excerpt {
    color: var(--blog-muted);
    font-size: 0.93rem;
    line-height: 1.6;
    margin: 0;
}

.article-card .tags {
    display: flex;
    gap: 8px;
    margin-top: 12px;
    flex-wrap: wrap;
}

.tag {
    font-size: 0.75rem;
    padding: 4px 12px;
    border-radius: 100px;
    background: rgba(8, 145, 178, 0.08);
    color: var(--blog-accent);
    font-weight: 500;
}

/* Article Page */
.article-page {
    padding: 48px 0 80px;
}

.article-page .back-link {
    display: inline-block;
    color: var(--blog-muted);
    text-decoration: none;
    font-size: 0.9rem;
    margin-bottom: 32px;
    transition: color 0.2s;
}

.article-page .back-link:hover { color: var(--blog-accent); }

.article-page .article-meta {
    margin-bottom: 32px;
}

.article-page .article-date {
    color: var(--blog-muted);
    font-size: 0.85rem;
}

.article-page h1 {
    font-size: 2rem;
    color: var(--blog-heading);
    margin: 12px 0 16px;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

.article-page .article-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.article-content {
    font-size: 1.05rem;
    line-height: 1.85;
    color: var(--blog-text);
}

.article-content h2 {
    font-size: 1.4rem;
    color: var(--blog-heading);
    margin: 40px 0 16px;
    padding-top: 8px;
}

.article-content h3 {
    font-size: 1.15rem;
    color: var(--blog-heading);
    margin: 28px 0 12px;
}

.article-content p {
    margin: 0 0 18px;
}

.article-content ul, .article-content ol {
    margin: 0 0 20px;
    padding-left: 24px;
}

.article-content li {
    margin-bottom: 8px;
}

.article-content strong {
    color: var(--blog-heading);
}

.article-content a {
    color: var(--blog-accent);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.article-content blockquote {
    border-left: 3px solid var(--blog-accent);
    padding: 12px 20px;
    margin: 24px 0;
    background: rgba(8, 145, 178, 0.03);
    border-radius: 0 8px 8px 0;
    color: var(--blog-muted);
    font-style: italic;
}

.article-content .cta-box {
    background: linear-gradient(135deg, #0891B2, #0E7490);
    color: #fff;
    border-radius: var(--blog-radius);
    padding: 28px 32px;
    margin: 36px 0;
    text-align: center;
}

.article-content .cta-box h3 { color: #fff; margin-top: 0; }
.article-content .cta-box a {
    display: inline-block;
    background: #fff;
    color: var(--blog-accent);
    padding: 12px 28px;
    border-radius: 100px;
    text-decoration: none;
    font-weight: 700;
    margin-top: 12px;
    transition: transform 0.2s;
}

.article-content .cta-box a:hover { transform: scale(1.05); }

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 12px;
    padding: 40px 0;
}

.pagination a, .pagination span {
    padding: 8px 16px;
    border-radius: 8px;
    text-decoration: none;
    color: var(--blog-text);
    font-weight: 500;
    border: 1px solid var(--blog-border);
}

.pagination a:hover { background: rgba(8, 145, 178, 0.05); }
.pagination .current { background: var(--blog-accent); color: #fff; border-color: var(--blog-accent); }

/* Breadcrumb */
.breadcrumb {
    font-size: 0.85rem;
    color: var(--blog-muted);
    margin-bottom: 24px;
}

.breadcrumb a { color: var(--blog-muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--blog-accent); }
.breadcrumb span { color: var(--blog-text); }

/* Footer */
.blog-footer {
    text-align: center;
    padding: 40px 0;
    border-top: 1px solid var(--blog-border);
    color: var(--blog-muted);
    font-size: 0.85rem;
}

.blog-footer a {
    color: var(--blog-accent);
    text-decoration: none;
}

/* Responsive */
@media (max-width: 640px) {
    .nav-ad-inner { gap: 8px; }
    :root { --bottom-banner-space: 84px; }
    .nav-ad { font-size: 0.84rem; padding: 12px 0; min-height: 54px; }
    .hero-ad-title { font-size: 1.08rem; }
    .bottom-banner-inner { gap: 8px; }
    .bottom-banner { font-size: 0.82rem; padding: 6px 0; }
    .blog-hero h1 { font-size: 1.6rem; }
    .article-card { padding: 20px 24px; }
    .article-card h2 { font-size: 1.1rem; }
    .article-page h1 { font-size: 1.5rem; }
}