/* ============================================
   BI4IVE Blog - 主样式表
   PHP 8.0+ · 深色模式优先 · CSS Variables
   ============================================ */

/* --- CSS Variables --- */
:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --bg-hover: #334155;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #334155;
    --accent: #60a5fa;
    --accent-hover: #3b82f6;
    --success: #34d399;
    --warning: #fbbf24;
    --danger: #f87171;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow: 0 2px 8px rgba(0,0,0,.2);
    --font-mono: 'Fira Code', 'Cascadia Code', Consolas, monospace;
    --max-width: 1080px;
}

[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-hover: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --shadow: 0 2px 8px rgba(0,0,0,.08);
}

/* --- Reset --- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:var(--bg-primary);color:var(--text-primary);line-height:1.7;min-height:100vh}
a{color:var(--accent);text-decoration:none;transition:color .15s}
a:hover{color:var(--accent-hover)}
img{max-width:100%;height:auto}
.container{max-width:var(--max-width);margin:0 auto;padding:0 20px}

/* --- Header --- */
.site-header{position:sticky;top:0;z-index:100;background:var(--bg-primary);border-bottom:1px solid var(--border);backdrop-filter:blur(12px)}
.nav-container{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{display:flex;flex-direction:column;line-height:1.2}
.logo-text{font-size:18px;font-weight:700;color:var(--text-primary)}
.logo-sub{font-size:11px;color:var(--text-muted)}
.main-nav{display:flex;gap:8px}
.nav-link{padding:6px 14px;border-radius:var(--radius);font-size:14px;color:var(--text-secondary);transition:all .15s}
.nav-link:hover,.nav-link:focus{background:var(--bg-hover);color:var(--text-primary)}
.nav-link.nav-admin{color:var(--accent)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:4px}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--text-primary);border-radius:2px;transition:.2s}

/* --- Hero --- */
.hero{position:relative;display:flex;align-items:center;justify-content:center;min-height:88vh;background:linear-gradient(135deg,#0f172a 0%,#1e3a5f 50%,#0f172a 100%);background-size:cover;background-position:center;text-align:center}
.hero-content{position:relative;z-index:1}
.avatar-ring{width:100px;height:100px;margin:0 auto 20px;border-radius:50%;background:linear-gradient(135deg,var(--accent),#8b5cf6);display:flex;align-items:center;justify-content:center}
.avatar-text{font-size:20px;font-weight:700;color:#fff;letter-spacing:2px}
.hero-title{font-size:36px;font-weight:800;margin-bottom:8px;letter-spacing:4px}
.hero-desc{font-size:16px;color:var(--text-secondary);margin-bottom:24px}
.hero-social{display:flex;gap:12px;justify-content:center}
.hero-social .social-icon{padding:8px 16px;border:1px solid var(--border);border-radius:var(--radius);font-size:13px;color:var(--text-secondary);text-transform:capitalize;transition:.15s}
.hero-social .social-icon:hover{background:var(--bg-hover);color:var(--text-primary)}
.hero-arrow{position:absolute;bottom:30px;left:50%;transform:translateX(-50%);cursor:pointer;animation:bounce 2s infinite;color:var(--text-muted)}
@keyframes bounce{0%,100%{transform:translateX(-50%) translateY(0)}50%{transform:translateX(-50%) translateY(8px)}}

/* --- Article List --- */
.article-list{padding:48px 20px}
.articles-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px}
.article-card{background:var(--bg-card);border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border);transition:transform .2s,box-shadow .2s}
.article-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.card-cover{display:block;height:200px;overflow:hidden;background:var(--bg-secondary)}
.card-cover img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.article-card:hover .card-cover img{transform:scale(1.03)}
.card-body{padding:20px}
.card-cat{display:inline-block;font-size:12px;color:var(--accent);margin-bottom:8px;text-transform:uppercase;letter-spacing:.5px}
.card-title{font-size:18px;font-weight:700;margin-bottom:8px;line-height:1.4}
.card-title a{color:var(--text-primary)}
.card-title a:hover{color:var(--accent)}
.card-summary{font-size:14px;color:var(--text-secondary);line-height:1.6;overflow:hidden;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical}
.card-meta{font-size:12px;color:var(--text-muted);margin-top:12px}

/* --- Article Detail --- */
.article-detail{padding:48px 20px}
.article-cover{margin:-48px -20px 32px;max-height:420px;overflow:hidden}
.article-cover img{width:100%;height:100%;object-fit:cover}
.article-header{margin-bottom:32px}
.article-title{font-size:32px;font-weight:800;line-height:1.3;margin-bottom:16px}
.article-meta{display:flex;flex-wrap:wrap;gap:16px;font-size:13px;color:var(--text-muted)}
.meta-item a{color:var(--text-secondary)}
.ai-summary{background:var(--bg-secondary);border-left:3px solid var(--accent);padding:16px 20px;margin-bottom:24px;border-radius:var(--radius);font-size:14px}
.ai-summary strong{display:block;margin-bottom:6px;color:var(--accent);font-size:12px;text-transform:uppercase}
.article-body{font-size:16px;line-height:1.9;word-wrap:break-word}
.article-body h2,.article-body h3,.article-body h4{margin-top:32px;margin-bottom:12px;font-weight:700;line-height:1.3}
.article-body h2{font-size:24px;border-bottom:2px solid var(--border);padding-bottom:8px}
.article-body h3{font-size:20px}
.article-body p{margin-bottom:16px}
.article-body ul,.article-body ol{margin-bottom:16px;padding-left:24px}
.article-body li{margin-bottom:8px}
.article-body blockquote{margin:16px 0;padding:12px 20px;border-left:4px solid var(--accent);background:var(--bg-secondary);border-radius:0 var(--radius) var(--radius) 0;color:var(--text-secondary)}
.article-body code{font-family:var(--font-mono);font-size:.9em;padding:2px 6px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:4px}
.article-body pre{overflow-x:auto;padding:20px;background:#0d1117;border-radius:var(--radius-lg);margin-bottom:16px;line-height:1.5}
.article-body pre code{background:none;border:none;padding:0;color:#c9d1d9}
.article-body table{width:100%;border-collapse:collapse;margin-bottom:16px}
.article-body th,.article-body td{border:1px solid var(--border);padding:10px 14px;text-align:left;font-size:14px}
.article-body th{background:var(--bg-secondary);font-weight:600}
.article-body img{border-radius:var(--radius);margin:8px 0}
.article-body hr{border:none;border-top:1px solid var(--border);margin:32px 0}

.article-tags{display:flex;flex-wrap:wrap;gap:8px;margin:32px 0}
.tag{padding:4px 12px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:20px;font-size:13px;color:var(--text-secondary)}
.tag:hover{background:var(--bg-hover);color:var(--text-primary)}

.article-nav{display:flex;justify-content:space-between;padding:24px 0;border-top:1px solid var(--border);margin-top:32px;font-size:14px}
.article-nav a{max-width:45%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* --- QSO Table --- */
.logbook-page,.links-page,.archive-page,.cat-page,.search-page,.page-detail{padding:48px 20px}
.page-title{font-size:28px;font-weight:800;margin-bottom:32px}

.stats-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:16px;margin-bottom:24px}
.stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px;text-align:center}
.stat-num{font-size:28px;font-weight:800;color:var(--accent)}
.stat-label{font-size:13px;color:var(--text-muted);margin-top:4px}

.filter-panel{margin-bottom:24px}
.filter-toggle{padding:10px 20px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);color:var(--text-secondary);cursor:pointer;font-size:14px}
.filter-toggle:hover{background:var(--bg-hover)}
.filter-form{display:none;margin-top:12px;padding:20px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg)}
.filter-form.open{display:block}
.filter-row{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:16px}
.filter-group label{display:block;font-size:12px;color:var(--text-muted);margin-bottom:4px}
.filter-group input,.filter-group select{width:100%;padding:8px 12px;background:var(--bg-primary);border:1px solid var(--border);border-radius:var(--radius);color:var(--text-primary);font-size:14px}
.filter-group input:focus,.filter-group select:focus{outline:none;border-color:var(--accent)}
.filter-actions{display:flex;align-items:end;gap:8px}

.table-wrapper{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--bg-card)}
.qso-table{width:100%;border-collapse:collapse;font-size:13px}
.qso-table th{background:var(--bg-secondary);padding:12px 10px;text-align:left;font-weight:600;font-size:12px;color:var(--text-muted);white-space:nowrap;position:sticky;top:0}
.qso-table td{padding:10px;border-top:1px solid var(--border);white-space:nowrap}
.qso-table tbody tr:hover{background:var(--bg-hover)}
.callsign-cell{font-weight:600;color:var(--accent)}
.freq-cell{font-family:var(--font-mono);font-size:12px}
.remark-cell{max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--text-muted)}
.empty-cell{text-align:center;padding:40px!important;color:var(--text-muted)}

.qsl-badge{padding:2px 8px;border-radius:12px;font-size:11px;font-weight:600}
.qsl-eqsl{background:rgba(52,211,153,.15);color:var(--success)}
.qsl-lotw{background:rgba(96,165,250,.15);color:var(--accent)}
.qsl-paper{background:rgba(251,191,36,.15);color:var(--warning)}
.qsl-pending{color:var(--text-muted)}

.logbook-actions{margin-top:24px;display:flex;gap:12px}

/* --- Comments --- */
.comments{margin-top:48px;padding-top:32px;border-top:1px solid var(--border)}
.section-title{font-size:20px;margin-bottom:24px}

.comment-list{margin-bottom:24px}
.comment-item{padding:16px 0;border-bottom:1px solid var(--border)}
.comment-header{display:flex;justify-content:space-between;margin-bottom:8px;font-size:13px}
.comment-header strong{color:var(--text-primary)}
.comment-header time{color:var(--text-muted)}
.comment-body{font-size:14px;color:var(--text-secondary);line-height:1.6}

.comment-form{display:flex;flex-direction:column;gap:12px;max-width:600px}
.comment-form input,.comment-form textarea{padding:10px 14px;background:var(--bg-primary);border:1px solid var(--border);border-radius:var(--radius);color:var(--text-primary);font-size:14px;font-family:inherit}
.comment-form textarea{resize:vertical;min-height:100px}

/* --- Links Page --- */
.link-group{margin-bottom:32px}
.link-group-title{font-size:18px;font-weight:700;margin-bottom:16px;padding-bottom:8px;border-bottom:2px solid var(--border)}
.link-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.link-card{display:flex;align-items:center;gap:14px;padding:16px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);transition:.15s;position:relative}
.link-card:hover{background:var(--bg-hover);transform:translateY(-1px)}
.link-avatar{width:48px;height:48px;border-radius:50%;object-fit:cover;flex-shrink:0}
.link-info{min-width:0}
.link-name{display:block;font-weight:600;color:var(--text-primary);font-size:15px}
.link-desc{display:block;font-size:13px;color:var(--text-muted);margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.link-status{width:8px;height:8px;border-radius:50%;background:var(--text-muted);flex-shrink:0;margin-left:auto}
.link-status.online{background:var(--success)}

/* --- Archive Page --- */
.archive-year{margin-bottom:32px}
.archive-year-title{font-size:22px;font-weight:700;margin-bottom:16px}
.archive-month-title{font-size:15px;color:var(--text-muted);margin-bottom:8px}
.archive-list{list-style:none}
.archive-list li{display:flex;align-items:baseline;gap:16px;padding:6px 0;border-bottom:1px solid var(--border)}
.archive-list time{font-family:var(--font-mono);font-size:13px;color:var(--text-muted);flex-shrink:0}
.archive-list a{font-size:15px}

/* --- Search Page --- */
.search-form{display:flex;gap:12px;margin-bottom:32px;max-width:500px}
.search-form input{flex:1;padding:10px 14px;background:var(--bg-primary);border:1px solid var(--border);border-radius:var(--radius);color:var(--text-primary);font-size:14px}
.search-form input:focus{outline:none;border-color:var(--accent)}
.search-item{padding:20px 0;border-bottom:1px solid var(--border)}
.search-item h2{font-size:18px;margin-bottom:8px}
.search-item p{font-size:14px;color:var(--text-secondary);margin-bottom:8px}
.search-item time{font-size:12px;color:var(--text-muted)}

/* --- Pagination --- */
.pagination{display:flex;justify-content:center;gap:8px;margin-top:32px}
.page-link{padding:8px 16px;border:1px solid var(--border);border-radius:var(--radius);font-size:13px;color:var(--text-secondary)}
.page-link:hover{background:var(--bg-hover)}
.page-link.active{background:var(--accent);color:#fff;border-color:var(--accent)}

/* --- Buttons --- */
.btn-primary{padding:10px 20px;background:var(--accent);color:#fff!important;border:none;border-radius:var(--radius);font-size:14px;cursor:pointer;font-weight:600;transition:.15s}
.btn-primary:hover{background:var(--accent-hover)}
.btn-secondary{padding:10px 20px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);color:var(--text-secondary);font-size:14px;cursor:pointer;display:inline-block}
.btn-secondary:hover{background:var(--bg-hover)}

/* --- Footer --- */
.site-footer{padding:32px 20px;border-top:1px solid var(--border);font-size:13px;color:var(--text-muted);margin-top:64px}
.footer-content{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px}
.footer-right{display:flex;align-items:center;gap:12px}
.footer-link{color:var(--text-muted);font-size:13px}
.footer-link:hover{color:var(--text-primary)}
.sep{color:var(--border)}
.beian{margin-top:4px}
.beian a{color:var(--text-muted)}
.theme-toggle{background:none;border:1px solid var(--border);border-radius:var(--radius);padding:4px 8px;cursor:pointer;font-size:16px;color:var(--text-secondary);line-height:1}

.empty-state{text-align:center;padding:80px 20px;color:var(--text-muted)}

/* --- Responsive --- */
@media (max-width:768px) {
    .nav-toggle{display:flex}
    .main-nav{display:none;position:absolute;top:60px;left:0;right:0;flex-direction:column;background:var(--bg-primary);border-bottom:1px solid var(--border);padding:12px 20px;gap:4px}
    .main-nav.open{display:flex}
    .articles-grid{grid-template-columns:1fr}
    .hero{min-height:70vh}
    .hero-title{font-size:26px}
    .article-title{font-size:24px}
    .article-body{font-size:15px}
    .link-grid{grid-template-columns:1fr}
    .filter-row{grid-template-columns:1fr 1fr}
    .footer-content{flex-direction:column;text-align:center}
    .qso-table{font-size:12px}
    .qso-table th,.qso-table td{padding:8px 6px}
}

@media (max-width:480px) {
    .filter-row{grid-template-columns:1fr}
    .article-nav{flex-direction:column;gap:12px}
    .article-nav a{max-width:100%}
}