/* ============================================================
   md-topic.css — 恶意加密通信识别专题页样式（2026-09-05 v4 全面修订版）
   样式基调与 tls-analysis.css（子课题分页）逐项对齐：
   CSS变量优先 / h2前缀竖条 / 侧栏border-left激活态 / 圆形分页步进
   仅服务于 malware-detection*.html 三个专题子课题页面；
   与 ../../style.css 变量兼容（全部带 fallback），不修改任何原站文件
   ============================================================ */
@keyframes fadeInDown{from{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}
@keyframes fadeInUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}

/* ===== 小组件 ===== */
.t-id{font-family:ui-monospace,'SF Mono',Consolas,monospace;font-size:12px;font-weight:700;color:var(--primary,#1a6eff);background:var(--primary-light,#e8f1ff);padding:2px 8px;border-radius:6px;white-space:nowrap}
.src-note{font-size:12px !important;color:var(--text-light,#8a8aa0) !important;font-style:italic;margin-top:10px !important;margin-bottom:0 !important;line-height:1.7 !important}
.ic{display:inline-flex;flex-shrink:0}
.ic svg{width:100%;height:100%}

/* ===== HERO ===== */
.sub-hero{position:relative;min-height:400px;display:flex;align-items:center;justify-content:center;background:linear-gradient(180deg,#f0f5ff 0%,#ffffff 100%);padding-top:72px;text-align:center;overflow:hidden}
.sub-hero::after{content:'';position:absolute;bottom:-1px;left:0;right:0;height:80px;background:linear-gradient(180deg,transparent,rgba(255,255,255,.9));pointer-events:none}
.sub-hero canvas.hero-fx{position:absolute;inset:0;width:100%;height:100%;z-index:1}
.sub-hero-content{max-width:880px;padding:48px 24px;position:relative;z-index:2;animation:fadeInDown .8s ease both}
.sub-hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(26,110,255,.08);color:var(--primary,#1a6eff);font-size:12px;font-weight:700;padding:7px 18px;border-radius:100px;margin-bottom:18px;border:1px solid rgba(26,110,255,.18);letter-spacing:.4px}
.sub-hero h1{font-size:clamp(28px,4.2vw,42px);font-weight:900;line-height:1.2;color:var(--text,#1c1c2e);margin-bottom:16px;letter-spacing:-1px}
.sub-hero h1 em{font-style:normal;font-size:.52em;font-weight:700;color:var(--text-light,#8a8aa0);vertical-align:middle;letter-spacing:0}
.sub-hero-content>p{font-size:15px;color:var(--text-secondary,#5a5a7a);max-width:720px;margin:0 auto;line-height:1.9}

/* ===== BREADCRUMB ===== */
.breadcrumb-wrap{background:#fff;border-bottom:1px solid var(--border,#e8ecf4)}
.breadcrumb{max-width:1200px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-light,#8a8aa0);flex-wrap:wrap}
.breadcrumb a{color:var(--primary,#1a6eff);text-decoration:none;font-weight:500}
.breadcrumb a:hover{text-decoration:underline}
.breadcrumb .sep{color:var(--border,#e8ecf4)}
.breadcrumb .current{color:var(--text-secondary,#5a5a7a);font-weight:500}

/* ===== PAGER（与 tls-analysis 对齐：圆形步进） ===== */
.apt-pager{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:36px;padding:18px 22px;background:#fff;border:1px solid var(--border,#e8ecf4);border-radius:14px}
.apt-pager.bottom{margin:40px 0 0}
.pager-btn{display:inline-flex;align-items:center;gap:8px;padding:11px 20px;border-radius:10px;font-size:14px;font-weight:600;text-decoration:none;border:1.5px solid var(--border,#e8ecf4);color:var(--text-secondary,#5a5a7a);background:#fff;transition:var(--transition,all .3s ease)}
.pager-btn:hover{border-color:var(--primary,#1a6eff);color:var(--primary,#1a6eff);transform:translateY(-2px);box-shadow:var(--shadow,0 4px 16px rgba(26,110,255,.12))}
.pager-btn.primary{background:linear-gradient(135deg,#1a6eff,#0d4fc4);color:#fff;border-color:transparent;box-shadow:0 4px 14px rgba(26,110,255,.28)}
.pager-btn.primary:hover{transform:translateY(-2px);box-shadow:0 8px 22px rgba(26,110,255,.36);color:#fff}
.pager-btn .ic{width:15px;height:15px}
.pager-steps{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.pager-steps .p-label{font-size:12px;color:var(--text-light,#8a8aa0);font-weight:600;margin-right:4px}
.pager-steps a{width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:var(--text-secondary,#5a5a7a);background:#fff;border:1.5px solid var(--border,#e8ecf4);text-decoration:none;transition:var(--transition,all .3s ease)}
.pager-steps a:hover{border-color:var(--primary,#1a6eff);color:var(--primary,#1a6eff)}
.pager-steps a.active{background:linear-gradient(135deg,#1a6eff,#0d4fc4);color:#fff;border-color:transparent;box-shadow:0 4px 12px rgba(26,110,255,.3)}

/* ===== CONTENT GRID + SIDEBAR ===== */
.content-grid{display:grid;grid-template-columns:250px minmax(0,1fr);gap:36px;align-items:start}
.content-grid>*,.content-main,.content-sidebar{min-width:0}
.content-sidebar{position:sticky;top:96px}
.sidebar-nav{background:#fff;border:1px solid var(--border,#e8ecf4);border-radius:14px;padding:20px}
.sidebar-nav h4{font-size:13px;font-weight:800;color:var(--text,#1c1c2e);margin:0 0 12px;padding-bottom:10px;border-bottom:1px solid var(--border,#e8ecf4);letter-spacing:.5px}
.sidebar-nav>ul{list-style:none;margin:0;padding:0}
.sidebar-nav>ul>li{margin-bottom:2px}
.sidebar-nav>ul a{display:block;padding:8px 12px;border-radius:8px;font-size:13px;color:var(--text-secondary,#5a5a7a);text-decoration:none;line-height:1.5;transition:var(--transition,all .3s ease);border-left:2px solid transparent}
.sidebar-nav>ul a:hover{background:var(--primary-light,#e8f1ff);color:var(--primary,#1a6eff)}
.sidebar-nav>ul a.active{background:var(--primary-light,#e8f1ff);color:var(--primary,#1a6eff);font-weight:700;border-left-color:var(--primary,#1a6eff)}
.mini-pager{margin-top:16px;padding-top:14px;border-top:1px dashed var(--border,#e8ecf4);display:flex;flex-direction:column;gap:6px}
.mini-pager a{display:flex;align-items:center;gap:8px;padding:9px 12px;border-radius:8px;font-size:12px;font-weight:600;color:var(--text-secondary,#5a5a7a);text-decoration:none;border:1px solid var(--border,#e8ecf4);transition:var(--transition,all .3s ease)}
.mini-pager a .ic{width:13px;height:13px}
.mini-pager a:hover{border-color:var(--primary,#1a6eff);color:var(--primary,#1a6eff)}
.mini-pager a.active{background:linear-gradient(135deg,#1a6eff,#0d4fc4);color:#fff;border-color:transparent}

/* ===== CONTENT SECTIONS ===== */
.content-section{background:#fff;border:1px solid var(--border,#e8ecf4);border-radius:16px;padding:36px 40px;margin-bottom:28px}
.content-section h2{display:flex;align-items:center;gap:10px;font-size:22px;font-weight:900;color:var(--text,#1c1c2e);margin:0 0 20px;padding-bottom:14px;border-bottom:2px solid var(--primary-light,#e8f1ff);letter-spacing:.3px}
.content-section h2 .ic{width:20px;height:20px;color:var(--primary,#1a6eff)}
.content-section h3{font-size:17px;font-weight:800;color:var(--text,#1c1c2e);margin:28px 0 12px;padding-left:12px;border-left:3px solid var(--primary,#1a6eff);line-height:1.5}
.content-section h4{font-size:15px;font-weight:700;color:var(--text,#1c1c2e);margin:18px 0 10px}
.content-section p{font-size:14.5px;color:var(--text-secondary,#5a5a7a);line-height:1.95;margin:0 0 14px}
.content-section p strong,.content-section li strong{color:var(--text,#1c1c2e);font-weight:700}
.content-section ul,.content-section ol{padding-left:22px;margin:0 0 14px}
.content-section li{font-size:14px;color:var(--text-secondary,#5a5a7a);line-height:1.9;margin-bottom:8px}
.content-section a{color:var(--primary,#1a6eff)}

/* ===== KV CARDS ===== */
.kv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:20px 0}
.kv-card{background:linear-gradient(135deg,var(--primary-light,#e8f1ff) 0%,rgba(26,110,255,.02) 100%);border:1px solid rgba(26,110,255,.12);border-radius:14px;padding:20px;transition:var(--transition,all .3s ease)}
.kv-card:hover{border-color:rgba(26,110,255,.3);box-shadow:0 8px 24px rgba(26,110,255,.12);transform:translateY(-3px)}
.kv-num{font-size:30px;font-weight:900;line-height:1;color:var(--primary,#1a6eff);font-variant-numeric:tabular-nums}
.kv-label{font-size:13px;font-weight:700;color:var(--text,#1c1c2e);margin-top:8px}
.kv-desc{font-size:12px;color:var(--text-secondary,#5a5a7a);line-height:1.7;margin-top:6px}

/* ===== FIGURE BOX ===== */
.figure-box{background:linear-gradient(180deg,#fbfcff 0%,#ffffff 100%);border:1px solid var(--border,#e8ecf4);border-radius:14px;padding:22px;margin:22px 0}
.figure-title{display:flex;align-items:center;gap:8px;font-size:15px;font-weight:800;color:var(--text,#1c1c2e);margin-bottom:4px}
.figure-title::before{content:'';width:8px;height:8px;background:linear-gradient(135deg,#1a6eff,#00c6ff);border-radius:2px;transform:rotate(45deg);flex-shrink:0}
.figure-title .ic{width:16px;height:16px;color:var(--primary,#1a6eff)}
.figure-sub{font-size:12px;color:var(--text-light,#8a8aa0);margin-bottom:14px}
.figure-box canvas{width:100%;display:block}
.figure-src{font-size:11.5px;color:var(--text-light,#8a8aa0);margin-top:12px;padding-top:10px;border-top:1px dashed var(--border,#e8ecf4);line-height:1.7}
.chart-legend{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:12px;justify-content:center}
.chart-legend .lg-item{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--text-secondary,#5a5a7a);font-weight:500}
.chart-legend .lg-dot{width:10px;height:10px;border-radius:3px;flex-shrink:0}

/* ===== TABLE ===== */
.table-wrap{overflow-x:auto;margin:16px 0;border:1px solid var(--border,#e8ecf4);border-radius:12px;-webkit-overflow-scrolling:touch;max-width:100%}
table.data-table{width:100%;border-collapse:collapse;font-size:13px;min-width:640px;background:#fff}
.data-table th{background:var(--primary-light,#e8f1ff);color:var(--text,#1c1c2e);font-weight:700;text-align:left;padding:12px 14px;white-space:nowrap;border-bottom:2px solid rgba(26,110,255,.15)}
.data-table td{padding:11px 14px;border-bottom:1px solid var(--border,#e8ecf4);color:var(--text-secondary,#5a5a7a);line-height:1.75;vertical-align:top;word-break:break-word;overflow-wrap:anywhere}
.data-table tr:last-child td{border-bottom:none}
.data-table tr:hover td{background:rgba(26,110,255,.025)}
.data-table td strong{color:var(--text,#1c1c2e)}

/* ===== INFO / WARN / DANGER BOX ===== */
.info-box{background:var(--primary-light,#e8f1ff);border-left:4px solid var(--primary,#1a6eff);border-radius:0 12px 12px 0;padding:16px 20px;margin:18px 0}
.info-box p{font-size:13.5px;color:var(--text-secondary,#5a5a7a);line-height:1.85;margin:0}
.info-box p strong{color:var(--text,#1c1c2e)}
.warn-box{background:#fff8f0;border-left:4px solid #f57c00;border-radius:0 12px 12px 0;padding:16px 20px;margin:18px 0}
.warn-box p{font-size:13.5px;color:#7a4a12;line-height:1.85;margin:0}
.warn-box p strong{color:#5c3609}
.danger-box{background:#fff3f3;border-left:4px solid #e11d48;border-radius:0 12px 12px 0;padding:16px 20px;margin:18px 0}
.danger-box p{font-size:13.5px;color:#8a3340;line-height:1.85;margin:0}
.danger-box p strong{color:#7f1d3a}

/* ===== CASE CARDS ===== */
.case-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.case-card{background:#fff;border:1px solid var(--border,#e8ecf4);border-radius:14px;padding:26px;transition:var(--transition,all .3s ease);display:flex;flex-direction:column}
.case-card:hover{border-color:rgba(26,110,255,.25);box-shadow:0 8px 24px rgba(26,110,255,.1);transform:translateY(-3px)}
.case-head{display:flex;align-items:center;gap:10px;margin-bottom:12px;flex-wrap:wrap}
.case-badge{font-size:11px;font-weight:800;padding:4px 12px;border-radius:100px;background:#fff0f0;color:#d32f2f;border:1px solid rgba(211,47,47,.2)}
.case-badge.blue{background:var(--primary-light,#e8f1ff);color:var(--primary,#1a6eff);border-color:rgba(26,110,255,.2)}
.case-badge.green{background:#e6f7ed;color:#2ea043;border-color:rgba(46,160,67,.2)}
.case-card h4{font-size:15.5px;font-weight:800;color:var(--text,#1c1c2e);margin:0}
.case-card p{font-size:13px;color:var(--text-secondary,#5a5a7a);line-height:1.8;margin-bottom:10px}
.case-points{margin-top:auto;background:var(--bg-warm,#fafbfd);border-radius:10px;padding:12px 16px;list-style:none}
.case-points li{font-size:12.5px !important;color:var(--text-secondary,#5a5a7a);line-height:1.75;margin-bottom:6px;padding-left:0 !important}
.case-points li:last-child{margin-bottom:0}

/* ===== REF LIST ===== */
.ref-list{display:flex;flex-direction:column;gap:10px}
.ref-item{display:flex;gap:14px;background:#fff;border:1px solid var(--border,#e8ecf4);border-radius:10px;padding:14px 18px;transition:var(--transition,all .3s ease)}
.ref-item:hover{border-color:rgba(26,110,255,.2);box-shadow:0 4px 14px rgba(26,110,255,.08)}
.ref-num{font-size:12px;font-weight:800;color:var(--primary,#1a6eff);background:var(--primary-light,#e8f1ff);padding:2px 8px;border-radius:6px;flex-shrink:0;height:fit-content;font-family:ui-monospace,Consolas,monospace}
.ref-item p{font-size:12.5px;color:var(--text-secondary,#5a5a7a);line-height:1.75;margin:0;word-break:break-word;overflow-wrap:anywhere}
.ref-item a{color:var(--primary,#1a6eff);word-break:break-all}

/* ===== REVEAL ===== */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
.reveal.visible{opacity:1;transform:none}

/* ===== 移动端顶部导航（与 tls-analysis.css 规则逐字对齐） ===== */
.mobile-toggle{display:none}
@media (max-width:768px){
    .mobile-toggle{display:flex}
    .nav-links{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;padding:16px 24px;box-shadow:0 8px 24px rgba(0,0,0,.08);gap:4px;border-bottom:1px solid var(--border,#e8ecf4);z-index:1000}
    .nav-links.active{display:flex}
    .nav-links li{width:100%}
    .nav-links li a{display:block;padding:10px 12px;border-radius:8px}
    .nav-links li a.active{background:var(--primary-light,#e8f1ff)}
    .section{padding:48px 0}
}
/* ===== 页脚响应式（与 tls-analysis.css 对齐） ===== */
@media (max-width:1024px){
    .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
    .footer-bottom{text-align:center}
}
@media (max-width:768px){
    .footer-grid{grid-template-columns:1fr;gap:24px}
    .footer{padding:40px 0 20px}
}

/* ===== RESPONSIVE ===== */
@media (max-width:1024px){
    .content-grid{grid-template-columns:1fr}
    .content-sidebar{position:static}
    .sidebar-nav>ul{display:flex;flex-wrap:wrap;gap:4px}
    .sidebar-nav>ul a{border-left:none;border:1px solid var(--border,#e8ecf4);border-radius:100px;padding:6px 14px;font-size:12px}
    .sidebar-nav>ul a.active{border-color:var(--primary,#1a6eff)}
    .mini-pager{flex-direction:row;flex-wrap:wrap}
    .case-grid{grid-template-columns:1fr}
}
@media (max-width:768px){
    .sub-hero{min-height:320px;padding-top:96px}
    .sub-hero h1{font-size:clamp(24px,6vw,32px)}
    .sub-hero h1 em{display:block;margin-top:6px}
    .sub-hero-content>p{font-size:13.5px}
    .content-section{padding:24px 18px}
    .content-section h2{font-size:19px}
    .content-section h3{margin:22px 0 10px}
    .kv-grid{grid-template-columns:1fr 1fr;gap:10px}
    .kv-num{font-size:24px}
    .kv-desc{font-size:11px}
    .apt-pager{flex-direction:column;align-items:stretch;padding:14px}
    .pager-btn{justify-content:center;font-size:13px;padding:10px 14px}
    .pager-steps{justify-content:center}
    .breadcrumb{padding:12px 16px;font-size:12px}
    .figure-box{padding:16px 12px}
    .figure-sub{font-size:11px}
    .data-table{font-size:12px}
    .data-table th,.data-table td{padding:8px 10px;line-height:1.65}
    .content-section p{overflow-wrap:break-word}
    .content-section li{overflow-wrap:break-word}
}
@media (max-width:420px){
    .kv-grid{grid-template-columns:1fr}
    .pager-steps a{width:30px;height:30px;font-size:12px}
}

/* ============================================================
   盒模型与溢出彻查修复（保留 v2 全部修复并并入新基调）
   ============================================================ */
.content-section,.content-section *,.apt-pager,.apt-pager *,
.sidebar-nav,.sidebar-nav *,.figure-box,.kv-grid,.kv-card,
.ref-item,.info-box,.warn-box,.danger-box,.case-card{box-sizing:border-box}
.footer-col img,.footer-brand img{max-width:100%;height:auto}

/* ============================================================
   汉堡按钮显示修正（v3 保留：基础规则写在移动断点后导致被覆盖，
   现以 !important 在文件末尾强制修正，仅影响加载本CSS的专题三页）
   ============================================================ */
@media (max-width:768px){
    .navbar .mobile-toggle,.nav-container .mobile-toggle,.mobile-toggle{display:flex !important}
    .navbar .nav-links.active,.nav-container .nav-links.active,.nav-links.active{display:flex !important;flex-direction:column}
}
@media (min-width:769px){
    .navbar .mobile-toggle,.nav-container .mobile-toggle,.mobile-toggle{display:none !important}
}

/* ===== v5 追加：图表移动端最小高度兜底（配合 JS 重绘，防文字挤压重叠） ===== */
@media (max-width:768px){
    canvas[data-chart="timeline"]{min-height:340px}
    canvas[data-chart="framework"]{min-height:300px}
    canvas[data-chart="flow"]{min-height:280px}
    canvas[data-chart="hbars"]{min-height:170px}
    canvas[data-chart="donut"]{min-height:230px}
    canvas[data-chart="line"]{min-height:230px}
    canvas[data-chart="bar"]{min-height:200px}
}
@media (max-width:420px){
    canvas[data-chart="timeline"]{min-height:360px}
    canvas[data-chart="framework"]{min-height:320px}
}