/* ============================================================
   decryption-tools.css — 解密工具开发专题（四卷）专属样式
   依赖 style.css 全局变量；与 ransomware.css 互不干扰
   ============================================================ */

/* ===== 页头 ===== */
.dt-page-header{padding:140px 0 48px;background:linear-gradient(180deg,#f0f5ff 0%,#ffffff 100%);text-align:center}
.dt-page-header h1{font-size:clamp(26px,4vw,38px);font-weight:900;margin-bottom:12px}
.dt-page-header h1 em{font-style:normal;background:var(--primary-gradient);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.dt-page-header .lead{max-width:760px;margin:0 auto;font-size:15px;color:var(--text-secondary);line-height:1.9}
.dt-crumbs{display:flex;justify-content:center;gap:8px;font-size:13px;color:var(--text-light);margin-bottom:18px;flex-wrap:wrap}
.dt-crumbs a{color:var(--primary);text-decoration:none;font-weight:500}
.dt-crumbs a:hover{text-decoration:underline}

/* ===== 分卷阅读导航（页顶部） ===== */
.dt-pager{margin:28px auto 0;max-width:960px;padding:0 24px}
.dt-pager-title{display:block;font-size:12px;font-weight:700;letter-spacing:2px;color:var(--text-light);margin-bottom:10px;text-transform:uppercase}
.dt-pager-links{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.dt-pager-links a{display:block;background:#fff;border:1.5px solid var(--border);border-radius:12px;padding:12px 8px;text-decoration:none;transition:var(--transition);color:inherit}
.dt-pager-links a b{display:block;font-size:13px;color:var(--text);margin-bottom:2px}
.dt-pager-links a span{font-size:11px;color:var(--text-light)}
.dt-pager-links a:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:var(--shadow)}
.dt-pager-links a.active{background:var(--primary-gradient);border-color:transparent;box-shadow:0 6px 18px rgba(26,110,255,.28)}
.dt-pager-links a.active b,.dt-pager-links a.active span{color:#fff}

/* ===== 卡片 ===== */
.dt-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.dt-cards.two{grid-template-columns:repeat(2,1fr)}
.dt-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:26px;transition:var(--transition);position:relative;overflow:hidden}
.dt-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--primary-gradient);transform:scaleX(0);transform-origin:left;transition:var(--transition)}
.dt-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px)}
.dt-card:hover::before{transform:scaleX(1)}
.dt-icon{width:46px;height:46px;border-radius:12px;background:var(--primary-light);display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.dt-icon svg{width:22px;height:22px;stroke:var(--primary);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.dt-card h4{font-size:16px;font-weight:700;margin-bottom:8px}
.dt-card p{font-size:13px;color:var(--text-secondary);line-height:1.8;margin-bottom:10px}
.dt-card .dt-src{font-size:11px;color:var(--text-light);border-top:1px dashed var(--border);padding-top:10px;margin-top:4px}
.dt-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.dt-tags span{font-size:11px;font-weight:600;color:var(--primary);background:var(--primary-light);padding:3px 10px;border-radius:100px}

/* ===== 时间线 ===== */
.dt-timeline{position:relative;max-width:860px;margin:0 auto;padding-left:36px}
.dt-timeline::before{content:'';position:absolute;left:11px;top:6px;bottom:6px;width:2px;background:linear-gradient(180deg,var(--primary),var(--primary-light),var(--border))}
.dt-tl-item{position:relative;padding-bottom:26px}
.dt-tl-item:last-child{padding-bottom:0}
.dt-tl-dot{position:absolute;left:-31px;top:6px;width:16px;height:16px;border-radius:50%;background:#fff;border:3px solid var(--primary);box-shadow:0 0 0 4px rgba(26,110,255,.12)}
.dt-tl-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:22px 24px;transition:var(--transition)}
.dt-tl-card:hover{box-shadow:var(--shadow);border-color:rgba(26,110,255,.25)}
.dt-tl-year{display:inline-block;font-size:12px;font-weight:800;color:#fff;background:var(--primary-gradient);padding:3px 14px;border-radius:100px;margin-bottom:8px}
.dt-tl-card h4{font-size:16px;font-weight:700;margin-bottom:6px}
.dt-tl-card p{font-size:13px;color:var(--text-secondary);line-height:1.8}
.dt-tl-card .dt-ref{font-size:11px;color:var(--text-light);margin-top:8px}

/* ===== 弱点分类 ===== */
.dt-flaw{display:flex;gap:16px;background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:22px;margin-bottom:14px;transition:var(--transition)}
.dt-flaw:hover{box-shadow:var(--shadow)}
.dt-flaw-num{flex-shrink:0;width:44px;height:44px;border-radius:12px;background:linear-gradient(135deg,#fef2f2,#fff7ed);color:#dc2626;font-weight:900;display:flex;align-items:center;justify-content:center;font-size:16px}
.dt-flaw h4{font-size:15px;font-weight:700;margin-bottom:4px}
.dt-flaw p{font-size:13px;color:var(--text-secondary);line-height:1.8}
.dt-flaw .case-tag{display:inline-block;font-size:11px;font-weight:700;color:#92400e;background:#fff7ed;border:1px dashed rgba(234,88,12,.35);padding:3px 10px;border-radius:100px;margin-top:6px}

/* ===== 提示框 ===== */
.dt-alert{display:flex;gap:12px;border-radius:var(--radius);padding:18px 20px;font-size:14px;line-height:1.8;margin:24px 0}
.dt-alert svg{flex-shrink:0;width:20px;height:20px;margin-top:2px;stroke-width:2}
.dt-alert.info{background:#eff6ff;border:1px dashed rgba(26,110,255,.35);color:#1e40af}
.dt-alert.info svg{stroke:#1a6eff}
.dt-alert.warn{background:#fff7ed;border:1px dashed rgba(234,88,12,.35);color:#92400e}
.dt-alert.warn svg{stroke:#ea580c}
.dt-alert.danger{background:#fef2f2;border:1px dashed rgba(220,38,38,.35);color:#7f1d1d}
.dt-alert.danger svg{stroke:#dc2626}
.dt-alert.ok{background:#f0fdf4;border:1px dashed rgba(22,163,74,.35);color:#14532d}
.dt-alert.ok svg{stroke:#16a34a}

/* ===== 流程 ===== */
.dt-flow{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin:24px 0}
.dt-step{background:#fff;border:1px solid var(--border);border-radius:12px;padding:18px 14px;text-align:center;position:relative;transition:var(--transition)}
.dt-step:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.dt-step .dt-step-no{width:28px;height:28px;border-radius:50%;background:var(--primary-gradient);color:#fff;font-weight:800;font-size:13px;display:flex;align-items:center;justify-content:center;margin:0 auto 10px}
.dt-step h5{font-size:13px;font-weight:700;margin-bottom:6px}
.dt-step p{font-size:12px;color:var(--text-secondary);line-height:1.7}

/* ===== 表格 ===== */
.dt-table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius);background:#fff;-webkit-overflow-scrolling:touch}
.dt-table{width:100%;min-width:680px;border-collapse:collapse;font-size:13px}
.dt-table th{background:var(--bg-warm);color:var(--text);font-weight:700;text-align:left;padding:14px 16px;border-bottom:2px solid var(--border);white-space:nowrap}
.dt-table td{padding:13px 16px;border-bottom:1px solid var(--border);color:var(--text-secondary);vertical-align:top;line-height:1.7}
.dt-table tr:last-child td{border-bottom:none}
.dt-table tr:hover td{background:#f8faff}
.dt-table td b{color:var(--text)}

/* ===== 参考文献 ===== */
.dt-refs{counter-reset:ref;background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px}
.dt-refs li{counter-increment:ref;list-style:none;position:relative;padding-left:40px;font-size:13px;color:var(--text-secondary);line-height:1.8;margin-bottom:10px}
.dt-refs li::before{content:'['counter(ref)']';position:absolute;left:0;top:0;font-weight:800;color:var(--primary);font-variant-numeric:tabular-nums}
.dt-refs a{color:var(--primary);text-decoration:none;word-break:break-all}
.dt-refs a:hover{text-decoration:underline}
.dt-refs .ref-note{font-size:12px;color:var(--text-light);border-top:1px dashed var(--border);padding-top:12px;margin-top:8px}

/* ===== 底部分页按钮 ===== */
.dt-pagenav{display:flex;justify-content:space-between;gap:16px;margin-top:56px;flex-wrap:wrap}
.dt-pagenav-btn{flex:1;min-width:240px;display:flex;flex-direction:column;gap:4px;background:#fff;border:1.5px solid var(--border);border-radius:14px;padding:18px 22px;text-decoration:none;transition:var(--transition);color:inherit}
.dt-pagenav-btn small{font-size:11px;font-weight:700;color:var(--text-light);letter-spacing:1px}
.dt-pagenav-btn b{font-size:15px;color:var(--text)}
.dt-pagenav-btn:hover{border-color:var(--primary);box-shadow:var(--shadow-hover);transform:translateY(-2px)}
.dt-pagenav-btn.next{text-align:right;align-items:flex-end;background:var(--primary-gradient);border-color:transparent}
.dt-pagenav-btn.next small{color:rgba(255,255,255,.7)}
.dt-pagenav-btn.next b{color:#fff}
.dt-pagenav-btn.next:hover{box-shadow:0 10px 28px rgba(26,110,255,.35)}
.dt-pagenav-btn.home{align-items:center;text-align:center}

/* ===== 页脚上方说明条 ===== */
.dt-footnote{font-size:12px;color:var(--text-light);text-align:center;margin-top:40px;line-height:1.8}

/* ===== 引用角标 ===== */
sup.dt-cite{color:var(--primary);font-weight:700;font-size:10px}

@media (max-width:1024px){
    .dt-cards{grid-template-columns:repeat(2,1fr)}
    .dt-flow{grid-template-columns:repeat(3,1fr)}
    .dt-pager-links{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:768px){
    .dt-page-header{padding:110px 0 36px}
    .dt-cards,.dt-cards.two{grid-template-columns:1fr}
    .dt-flow{grid-template-columns:1fr}
    .dt-flaw{flex-direction:column;gap:10px}
    .dt-pagenav{flex-direction:column}
    .dt-pagenav-btn.next{text-align:left;align-items:flex-start}
    .dt-pager-links{grid-template-columns:1fr 1fr;gap:8px}
    .dt-timeline{padding-left:28px}
    .dt-tl-dot{left:-25px}
    .section{padding:48px 0}
}
/* 说明条目不编号 */
.dt-refs li.ref-note::before{content:none}
.dt-refs li.ref-note{padding-left:0;color:var(--text-light)}

/* ============================================================
   移动端导航与页脚适配（与 ransomware.css 保持一致）
   ============================================================ */
@media (max-width: 768px) {
    /* 顶部导航：折叠为汉堡菜单 */
    .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0; right: 0;
        background: white;
        flex-direction: column;
        padding: 16px 24px;
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
        gap: 4px;
        border-bottom: 1px solid var(--border);
    }
    .nav-links.active { display: flex; }
    .mobile-toggle { display: flex; }
    /* 页脚：单列堆叠 */
    .footer { padding: 48px 0 24px; }
    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    .footer-brand .logo-icon img { height: 64px; }
    .footer-bottom { flex-direction: column; align-items: flex-start; gap: 8px; }
}

/* 四卡片区块：PC 端 2×2 排布 */
.dt-cards.quad{grid-template-columns:repeat(2,1fr)}