/* ============================================================
   ai-ransomware.css — AI驱动勒索软件研究专题（多页）
   与 style.css 全局变量完全兼容
   ============================================================ */

/* ===== 专题页头 ===== */
.ai-hero{padding:150px 0 64px;background:linear-gradient(180deg,#f0f5ff 0%,#ffffff 100%);text-align:center;position:relative;overflow:hidden}
.ai-hero::before{content:'';position:absolute;top:-120px;left:50%;transform:translateX(-50%);width:720px;height:720px;background:radial-gradient(circle,rgba(26,110,255,0.10) 0%,rgba(26,110,255,0.04) 45%,transparent 70%);pointer-events:none}
.ai-hero-inner{position:relative;z-index:1}
.ai-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(26,110,255,0.08);color:#1a6eff;font-size:12px;font-weight:700;padding:7px 18px;border-radius:100px;border:1px solid rgba(26,110,255,0.18);margin-bottom:20px;letter-spacing:1px}
.ai-hero h1{font-size:clamp(28px,4.6vw,46px);font-weight:900;line-height:1.2;margin-bottom:16px;letter-spacing:-0.5px}
.ai-hero h1 .grad{background:linear-gradient(135deg,#1a6eff 0%,#0d4fc4 100%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.ai-hero-sub{font-size:clamp(14px,1.8vw,17px);color:var(--text-secondary);max-width:760px;margin:0 auto 28px;line-height:1.9}
.ai-meta-chips{display:flex;justify-content:center;gap:10px;flex-wrap:wrap}
.ai-chip{font-size:12px;font-weight:600;color:var(--text-secondary);background:#fff;border:1px solid var(--border);padding:6px 14px;border-radius:100px}
.ai-chip b{color:#1a6eff}

/* ===== 章节 ===== */
.ai-section{padding:64px 0}
.ai-section.alt{background:var(--bg-warm)}
.ai-chapter-head{display:flex;align-items:flex-start;gap:18px;margin-bottom:36px;max-width:840px}
.ai-chapter-num{flex-shrink:0;width:52px;height:52px;border-radius:14px;background:linear-gradient(135deg,#1a6eff,#0d4fc4);color:#fff;font-size:20px;font-weight:900;display:flex;align-items:center;justify-content:center;box-shadow:0 6px 18px rgba(26,110,255,0.28)}
.ai-chapter-head h2{font-size:clamp(21px,2.6vw,28px);font-weight:800;line-height:1.35;margin-bottom:6px}
.ai-chapter-head p{font-size:14px;color:var(--text-secondary);line-height:1.8}

/* ===== 摘要框 ===== */
.ai-abstract{background:linear-gradient(135deg,#e8f1ff 0%,#eef4ff 100%);border:1px solid rgba(26,110,255,0.15);border-radius:var(--radius);padding:30px 32px;position:relative;margin-bottom:40px}
.ai-abstract::before{content:'';position:absolute;left:0;top:24px;bottom:24px;width:4px;border-radius:4px;background:linear-gradient(180deg,#1a6eff,#0d4fc4)}
.ai-abstract h3{font-size:17px;font-weight:800;margin-bottom:14px;display:flex;align-items:center;gap:8px;color:var(--text)}
.ai-abstract p{font-size:14.5px;color:var(--text-secondary);line-height:2;margin-bottom:10px}
.ai-abstract p:last-child{margin-bottom:0}
.ai-abstract strong{color:var(--text)}

/* ===== 数据卡 ===== */
.ai-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-bottom:36px}
.ai-stat{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;transition:var(--transition);position:relative;overflow:hidden}
.ai-stat::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,#1a6eff,#0d4fc4)}
.ai-stat:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.ai-stat-num{font-size:32px;font-weight:900;color:#1a6eff;line-height:1;font-variant-numeric:tabular-nums}
.ai-stat-num small{font-size:15px;font-weight:700;color:var(--text-light);margin-left:2px}
.ai-stat-label{font-size:13px;font-weight:600;color:var(--text);margin-top:8px}
.ai-stat-desc{font-size:12px;color:var(--text-light);margin-top:6px;line-height:1.7}

/* ===== 图表卡 ===== */
.ai-chart-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:26px;margin-bottom:24px}
.ai-chart-card h4{font-size:15px;font-weight:700;margin-bottom:4px;display:flex;align-items:center;gap:8px}
.ai-chart-card .chart-sub{font-size:12px;color:var(--text-light);margin-bottom:16px}
.ai-chart-wrap{position:relative;width:100%}
.ai-chart-wrap canvas{display:block;width:100%;height:auto}
.ai-legend{display:flex;flex-wrap:wrap;gap:14px;margin-top:12px;font-size:12px;color:var(--text-secondary)}
.ai-legend i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:6px;vertical-align:-1px}
.chart-src{font-size:11px;color:var(--text-light);margin-top:12px;padding-top:10px;border-top:1px dashed var(--border)}

/* ===== 攻击链环节 ===== */
.ai-killchain{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.ai-kc-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;transition:var(--transition)}
.ai-kc-card:hover{border-color:rgba(26,110,255,0.25);box-shadow:var(--shadow-hover);transform:translateY(-3px)}
.ai-kc-icon{width:46px;height:46px;border-radius:12px;background:linear-gradient(135deg,rgba(26,110,255,0.10),rgba(26,110,255,0.10));display:flex;align-items:center;justify-content:center;color:#1a6eff;margin-bottom:14px}
.ai-kc-icon svg{width:23px;height:23px}
.ai-kc-card h4{font-size:15.5px;font-weight:700;margin-bottom:6px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.ai-kc-card h4 .kc-tag{font-size:10px;font-weight:800;color:#1a6eff;background:rgba(26,110,255,0.10);padding:2px 8px;border-radius:100px;letter-spacing:0.5px}
.ai-kc-card p{font-size:13px;color:var(--text-secondary);line-height:1.85}
.ai-kc-card .kc-src{font-size:11px;color:var(--text-light);margin-top:10px}

/* ===== 论点/要点列表 ===== */
.ai-points{list-style:none;padding:0;margin:0}
.ai-points li{font-size:14px;color:var(--text-secondary);line-height:1.9;padding-left:22px;position:relative;margin-bottom:12px}
.ai-points li::before{content:'';position:absolute;left:2px;top:11px;width:7px;height:7px;border-radius:50%;background:linear-gradient(135deg,#1a6eff,#0d4fc4)}
.ai-points li strong{color:var(--text)}

/* ===== 引用块 ===== */
.ai-quote{background:#fff;border:1px solid var(--border);border-left:4px solid #1a6eff;border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:18px 22px;margin:22px 0;font-size:14px;color:var(--text);line-height:1.9}
.ai-quote .q-src{display:block;margin-top:8px;font-size:12px;color:var(--text-light);font-weight:500}

/* ===== 表格 ===== */
.ai-table-wrap{overflow-x:auto;background:#fff;border:1px solid var(--border);border-radius:var(--radius);margin-bottom:24px;-webkit-overflow-scrolling:touch}
.ai-table{width:100%;border-collapse:collapse;min-width:640px}
.ai-table th{background:linear-gradient(135deg,#e8f1ff,#eef4ff);font-size:13px;font-weight:700;color:var(--text);padding:14px 16px;text-align:left;white-space:nowrap;border-bottom:2px solid rgba(26,110,255,0.15)}
.ai-table td{font-size:13px;color:var(--text-secondary);padding:13px 16px;border-bottom:1px solid var(--border);line-height:1.75;vertical-align:top}
.ai-table tr:last-child td{border-bottom:none}
.ai-table td b{color:var(--text)}
.ai-table tr:hover td{background:rgba(26,110,255,0.02)}

/* ===== 时间线 ===== */
.ai-timeline{position:relative;max-width:820px;margin:0 auto;padding-left:44px}
.ai-timeline::before{content:'';position:absolute;left:14px;top:6px;bottom:6px;width:2px;background:linear-gradient(180deg,#1a6eff,#3b82f6,rgba(59,130,246,0.15))}
.ai-tl-item{position:relative;padding-bottom:34px}
.ai-tl-item:last-child{padding-bottom:0}
.ai-tl-dot{position:absolute;left:-37px;top:4px;width:16px;height:16px;background:#fff;border:3px solid #1a6eff;border-radius:50%}
.ai-tl-date{font-size:12px;font-weight:800;color:#1a6eff;background:rgba(26,110,255,0.08);display:inline-block;padding:3px 12px;border-radius:100px;margin-bottom:8px}
.ai-tl-item h4{font-size:16px;font-weight:700;margin-bottom:6px}
.ai-tl-item p{font-size:13.5px;color:var(--text-secondary);line-height:1.85}

/* ===== 参考文献 ===== */
.ai-refs{counter-reset:ref;background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:30px 34px}
.ai-refs h3{font-size:17px;font-weight:800;margin-bottom:18px;display:flex;align-items:center;gap:8px}
.ai-refs ol{list-style:none;padding:0;margin:0}
.ai-refs li{counter-increment:ref;font-size:13px;color:var(--text-secondary);line-height:1.8;padding-left:34px;position:relative;margin-bottom:12px}
.ai-refs li::before{content:'['counter(ref)']';position:absolute;left:0;top:1px;font-weight:800;color:#1a6eff;font-variant-numeric:tabular-nums}
.ai-refs li a{color:var(--primary);text-decoration:none;word-break:break-all}
.ai-refs li a:hover{text-decoration:underline}
.ai-refs .ref-note{font-size:12px;color:var(--text-light);margin-top:16px;padding-top:14px;border-top:1px dashed var(--border)}

/* ===== 分页导航 ===== */
.ai-pager{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-top:52px;flex-wrap:wrap}
.ai-pager-btn{display:inline-flex;align-items:center;gap:10px;padding:13px 24px;border-radius:12px;font-size:14px;font-weight:600;text-decoration:none;transition:var(--transition);border:1.5px solid var(--border);background:#fff;color:var(--text-secondary)}
.ai-pager-btn:hover{border-color:#1a6eff;color:#1a6eff;transform:translateY(-2px);box-shadow:0 6px 18px rgba(26,110,255,0.15)}
.ai-pager-btn.primary{background:linear-gradient(135deg,#1a6eff,#0d4fc4);color:#fff;border-color:transparent}
.ai-pager-btn.primary:hover{box-shadow:0 8px 24px rgba(26,110,255,0.3);color:#fff}
.ai-pager-btn.disabled{opacity:0.4;pointer-events:none}
.ai-pager-info{font-size:13px;color:var(--text-light);text-align:center;flex:1;min-width:140px}
.ai-pager-info b{color:#1a6eff}

/* ===== 目录导航 ===== */
.ai-toc{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:26px}
.ai-toc a{font-size:13px;font-weight:600;color:var(--text-secondary);background:#fff;border:1px solid var(--border);padding:8px 18px;border-radius:100px;text-decoration:none;transition:var(--transition)}
.ai-toc a:hover,.ai-toc a.active{border-color:#1a6eff;color:#1a6eff}
.ai-toc a.active{background:rgba(26,110,255,0.06)}

/* ===== 两栏图文 ===== */
.ai-split{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start}
.ai-note{font-size:12.5px;color:var(--text-light);line-height:1.8;background:var(--bg-warm);border:1px dashed var(--border);border-radius:var(--radius-sm);padding:14px 16px;margin-top:14px}

/* ===== 响应式 ===== */
@media(max-width:1024px){
 .ai-stats{grid-template-columns:repeat(2,1fr)}
 .ai-killchain{grid-template-columns:repeat(2,1fr)}
 .ai-split{grid-template-columns:1fr}
}
@media(max-width:768px){
 .ai-hero{padding:120px 0 48px}
 .ai-section{padding:44px 0}
 .ai-chapter-head{gap:12px}
 .ai-chapter-num{width:42px;height:42px;font-size:16px;border-radius:11px}
 .ai-stats{grid-template-columns:1fr 1fr;gap:12px}
 .ai-stat{padding:18px}
 .ai-stat-num{font-size:26px}
 .ai-killchain{grid-template-columns:1fr}
 .ai-abstract{padding:22px 20px}
 .ai-timeline{padding-left:36px}
 .ai-timeline::before{left:10px}
 .ai-tl-dot{left:-32px}
 .ai-pager{flex-direction:column}
 .ai-pager-info{order:-1}
 .ai-table{min-width:560px}
 .ai-refs{padding:22px 18px}
 .ai-refs li{padding-left:30px}
}


/* ============================================================
   移动端导航与页脚专项适配（与官网风格一致）
   ============================================================ */
@media(max-width:768px){
 /* 汉堡按钮 */
 .mobile-toggle{display:flex;width:40px;height:40px;border:none;background:var(--primary-light);border-radius:10px;cursor:pointer;flex-direction:column;align-items:center;justify-content:center;gap:5px;-webkit-tap-highlight-color:transparent}
 .mobile-toggle span{display:block;width:20px;height:2px;background:var(--primary);border-radius:2px;transition:var(--transition)}
 .mobile-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
 .mobile-toggle.open span:nth-child(2){opacity:0}
 .mobile-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
 /* 移动端下拉菜单面板 */
 .nav-links{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;padding:12px 16px 16px;box-shadow:0 12px 32px rgba(0,0,0,0.10);gap:2px;border-bottom:1px solid var(--border);max-height:calc(100vh - 72px);overflow-y:auto;-webkit-overflow-scrolling:touch}
 .nav-links.active{display:flex;animation:aiNavDrop .25s ease}
 .nav-links li{width:100%;list-style:none}
 .nav-links a{display:block;width:100%;padding:13px 16px;font-size:15px;border-radius:10px;color:var(--text-secondary)}
 .nav-links a:hover,.nav-links a.active{background:var(--primary-light);color:var(--primary)}
 @keyframes aiNavDrop{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}
 /* 页脚移动端 */
 .footer{padding:44px 0 24px}
 .footer-grid{grid-template-columns:1fr !important;gap:28px;margin-bottom:32px}
 .footer-brand p{max-width:100%}
 .footer-col h4{margin-bottom:14px}
 .footer-col li{margin-bottom:8px}
 .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
}
/* 中等屏页脚 */
@media(min-width:769px) and (max-width:1024px){
 .footer-grid{grid-template-columns:1fr 1fr !important;gap:32px}
}