/* ============ 公开营销站样式（基于 style.css 变量） ============ */
body.public { background: var(--bg); }
.pub-container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.center { text-align: center; }

/* Header */
.pub-header {
    position: sticky; top: 0; z-index: 50;
    background: color-mix(in srgb, var(--bg-card) 92%, transparent);
    backdrop-filter: saturate(160%) blur(8px);
    border-bottom: 1px solid var(--border);
}
.pub-nav { display: flex; align-items: center; gap: 18px; height: 60px; }
.pub-logo { font-size: 18px; font-weight: 800; color: var(--primary); text-decoration: none; white-space: nowrap; }
.pub-menu { display: flex; gap: 18px; margin-left: 8px; }
.pub-menu a { color: var(--text); text-decoration: none; font-size: 14px; font-weight: 500; }
.pub-menu a:hover { color: var(--primary); }
.pub-actions { margin-left: auto; display: flex; align-items: center; gap: 10px; }

.pub-lang { position: relative; }
.pub-lang-btn { background: var(--bg-input); border: 1px solid var(--border); color: var(--text); border-radius: 8px; padding: 7px 10px; font-size: 13px; cursor: pointer; }
.pub-lang-menu { position: absolute; right: 0; top: calc(100% + 6px); background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px; padding: 4px; min-width: 120px; box-shadow: var(--shadow-lg); display: none; }
.pub-lang:hover .pub-lang-menu,
.pub-lang:focus-within .pub-lang-menu { display: block; }
.pub-lang-menu a { display: block; padding: 8px 12px; color: var(--text); text-decoration: none; border-radius: 6px; font-size: 13px; }
.pub-lang-menu a:hover { background: var(--bg-hover); }
.pub-lang-menu a.on { color: var(--primary); font-weight: 600; }

/* Hero */
.pub-hero { padding: 72px 0 56px; text-align: center; background:
    radial-gradient(900px 360px at 50% -10%, var(--primary-glow), transparent 70%); }
.pub-hero h1 { font-size: 40px; line-height: 1.2; font-weight: 800; letter-spacing: -0.5px; color: var(--text); max-width: 880px; margin: 0 auto 18px; }
.hero-sub { font-size: 17px; color: var(--text-muted); max-width: 720px; margin: 0 auto 28px; line-height: 1.7; }
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero-cta .btn { padding: 12px 26px; font-size: 15px; }
.hero-stats { display: flex; gap: 40px; justify-content: center; margin-top: 44px; flex-wrap: wrap; }
.hero-stats .hs b { display: block; font-size: 32px; font-weight: 800; color: var(--primary); }
.hero-stats .hs span { font-size: 13px; color: var(--text-muted); }

/* Sections */
.pub-section { padding: 56px 0; }
.pub-section.alt { background: var(--bg-card); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.pub-section h2 { font-size: 26px; font-weight: 800; text-align: center; color: var(--text); margin-bottom: 10px; }
.sec-desc { text-align: center; color: var(--text-muted); max-width: 680px; margin: 0 auto 32px; line-height: 1.7; }

/* Feature groups */
.feat-groups { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }
.feat-group { background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px; padding: 20px; }
.pub-section.alt .feat-group { background: var(--bg); }
.fg-title { font-size: 15px; font-weight: 700; color: var(--primary); margin-bottom: 14px; padding-bottom: 10px; border-bottom: 1px solid var(--border); }
.feat-group ul { list-style: none; }
.feat-group li { padding: 9px 0; border-bottom: 1px dashed var(--border); }
.feat-group li:last-child { border-bottom: 0; }
.feat-group li b { display: block; font-size: 14px; color: var(--text); margin-bottom: 2px; }
.feat-group li span { font-size: 12.5px; color: var(--text-muted); line-height: 1.5; }

/* Article cards */
.art-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 18px; }
.art-card { display: block; background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px; padding: 20px; text-decoration: none; transition: all .2s; }
.art-card:hover { border-color: var(--primary); transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.ac-cat { font-size: 11px; color: var(--primary); font-weight: 700; text-transform: uppercase; letter-spacing: .5px; margin-bottom: 8px; }
.ac-title { font-size: 16px; font-weight: 700; color: var(--text); line-height: 1.4; margin-bottom: 8px; }
.ac-sum { font-size: 13px; color: var(--text-muted); line-height: 1.6; margin-bottom: 12px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.ac-meta { font-size: 12px; color: var(--text-dim); }

/* Pages */
.pub-page { padding: 32px 20px 64px; }
.crumb { font-size: 13px; color: var(--text-muted); margin-bottom: 14px; }
.crumb a { color: var(--text-muted); text-decoration: none; }
.crumb a:hover { color: var(--primary); }
.pub-page h1 { font-size: 30px; font-weight: 800; color: var(--text); margin-bottom: 12px; line-height: 1.3; }
.art-info { font-size: 13px; color: var(--text-dim); margin-bottom: 24px; }

/* Article body */
.art-body { font-size: 16px; line-height: 1.9; color: var(--text); max-width: 760px; }
.art-body h2 { font-size: 22px; font-weight: 700; margin: 30px 0 12px; color: var(--text); }
.art-body h3 { font-size: 18px; font-weight: 700; margin: 24px 0 10px; color: var(--text); }
.art-body p { margin: 0 0 16px; }
.art-body ul, .art-body ol { margin: 0 0 16px 22px; }
.art-body li { margin-bottom: 6px; }
.art-body a { color: var(--primary); text-decoration: underline; }
.art-body code { background: var(--bg-input); padding: 2px 6px; border-radius: 4px; font-size: 14px; font-family: 'SF Mono', monospace; }
.art-body pre { background: var(--bg-input); border: 1px solid var(--border); border-radius: 8px; padding: 14px; overflow: auto; margin: 0 0 16px; }
.art-body pre code { background: none; padding: 0; }
.art-body img { max-width: 100%; border-radius: 8px; }
.art-body blockquote { border-left: 3px solid var(--primary); padding: 4px 0 4px 16px; margin: 0 0 16px; color: var(--text-muted); }
.art-related { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--border); max-width: 760px; }
.art-related h3 { font-size: 16px; margin-bottom: 10px; }
.art-related ul { list-style: none; }
.art-related li { padding: 6px 0; }
.art-related a { color: var(--primary); text-decoration: none; }
.art-related a:hover { text-decoration: underline; }

/* Footer */
.pub-footer { background: var(--bg-card); border-top: 1px solid var(--border); padding: 40px 0 28px; margin-top: 20px; }
.pub-foot-cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 24px; margin-bottom: 24px; }
.pf-h { font-size: 14px; font-weight: 700; color: var(--text); margin-bottom: 10px; }
.pub-foot-cols p, .pub-foot-cols a { font-size: 13px; color: var(--text-muted); line-height: 1.7; text-decoration: none; display: block; }
.pub-foot-cols a:hover { color: var(--primary); }
.pf-copy { text-align: center; font-size: 12px; color: var(--text-dim); padding-top: 18px; border-top: 1px solid var(--border); }

@media (max-width: 768px) {
    .pub-menu { display: none; }
    .pub-hero h1 { font-size: 30px; }
    .hero-stats { gap: 28px; }
    /* 触控目标放大到易点按尺寸 */
    .pub-lang-btn { padding: 10px 12px; }
    /* 文章正文宽表格兜底，防窄屏横向溢出 */
    .art-body table { display: block; overflow-x: auto; max-width: 100%; }
}

@media (max-width: 480px) {
    /* 顶栏窄屏安全换行，杜绝 logo+语言+按钮挤爆或被裁切（英文 Login/Register 更长） */
    .pub-nav { flex-wrap: wrap; height: auto; min-height: 60px; gap: 10px; row-gap: 8px; padding: 8px 0; }
    .pub-hero { padding: 48px 0 40px; }
    .pub-hero h1 { font-size: 25px; }
    .pub-section { padding: 40px 0; }
    .pub-section h2 { font-size: 22px; }
    .pub-page h1 { font-size: 24px; }
}