@charset "utf-8";
/* ==========================================================================
   一条长河网 · 8 个学习模块页独立版式 module.css
   说明：每页用独立前缀命名空间，禁止雷同布局
   前缀：tut- / art- / qa- / int- / proj- / rm- / know- / res-
   ========================================================================== */


/* ==========================================================================
   1. tutorials.html —— 纵向阶梯路径（tut-）
   ========================================================================== */

/* 阶梯容器：4 阶段竖排，奇偶左右错位形成阶梯感 */
.tut-path{position:relative;padding:20px 0 10px}
.tut-path::before{
  content:"";position:absolute;left:50%;top:0;bottom:0;width:3px;
  background:repeating-linear-gradient(var(--latte) 0 10px,transparent 10px 20px);
  transform:translateX(-50%);opacity:.6;
}
.tut-stage{
  position:relative;display:grid;grid-template-columns:1fr 1fr;gap:36px;
  background:var(--cream-50);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:34px 38px;margin-bottom:48px;box-shadow:var(--shadow-sm);
  transition:transform .4s var(--ease),box-shadow .4s var(--ease);
}
.tut-stage:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
/* 奇数阶段靠左、偶数阶段靠右，营造阶梯上升 */
.tut-stage:nth-child(odd){margin-right:22%}
.tut-stage:nth-child(even){margin-left:22%}
/* 阶段节点圆点（位于中线） */
.tut-stage::after{
  content:"";position:absolute;top:50%;width:22px;height:22px;border-radius:50%;
  background:var(--pink-300);border:5px solid var(--cream-50);box-shadow:0 0 0 2px var(--pink-300);
  transform:translateY(-50%);
}
.tut-stage:nth-child(odd)::after{right:-11%;margin-right:-11px}
.tut-stage:nth-child(even)::after{left:-11%;margin-left:-11px}

/* 左侧阶段编号 + 标题 */
.tut-stage-head{display:flex;flex-direction:column;gap:10px;border-right:1px dashed var(--line);padding-right:24px}
.tut-stage-num{
  font-family:var(--f-serif);font-size:4.4rem;line-height:1;color:var(--cream-300);
  font-weight:700;letter-spacing:-2px;
}
.tut-stage:nth-child(2) .tut-stage-num{color:var(--latte)}
.tut-stage:nth-child(3) .tut-stage-num{color:var(--coffee)}
.tut-stage:nth-child(4) .tut-stage-num{color:var(--brown-700)}
.tut-stage-name{font-size:1.6rem;color:var(--brown-900)}
.tut-stage-tag{display:inline-block;font-family:var(--f-mono);font-size:.72rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--coffee);background:var(--cream-200);padding:4px 12px;border-radius:20px;width:fit-content}

/* 右侧课程清单 */
.tut-courses{display:flex;flex-direction:column;gap:14px}
.tut-course{
  display:grid;grid-template-columns:auto 1fr auto;gap:14px;align-items:center;
  padding:14px 16px;border-radius:12px;background:var(--cream-100);
  transition:background .3s var(--ease),transform .3s var(--ease);
}
.tut-course:hover{background:var(--cream-200);transform:translateX(4px)}
.tut-course .lv{font-family:var(--f-mono);font-size:.7rem;font-weight:700;letter-spacing:.08em;
  padding:4px 10px;border-radius:14px;white-space:nowrap}
.tut-course .lv.l1{background:#E8F0E4;color:#5B7A4F}
.tut-course .lv.l2{background:var(--foam);color:var(--coffee)}
.tut-course .lv.l3{background:var(--pink-200);color:var(--pink-500)}
.tut-course .lv.l4{background:var(--brown-800);color:var(--latte)}
.tut-course .info h5{font-family:var(--f-sans);font-size:.98rem;font-weight:600;color:var(--brown-800);line-height:1.4}
.tut-course .info p{font-size:.84rem;color:var(--muted);margin-top:2px;line-height:1.5}
.tut-course .go{font-family:var(--f-mono);font-size:.74rem;letter-spacing:.08em;font-weight:700;
  color:var(--pink-500);white-space:nowrap}
.tut-course .go::after{content:" →";transition:margin .3s var(--ease)}
.tut-course:hover .go::after{margin-left:4px}

/* 底部按语言入口 */
.tut-lang{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.tut-lang a{
  display:flex;flex-direction:column;align-items:center;gap:10px;padding:24px 14px;
  background:var(--cream-50);border:1px solid var(--line);border-radius:var(--radius);
  transition:all .35s var(--ease);text-align:center;
}
.tut-lang a:hover{background:var(--brown-800);border-color:var(--brown-800);transform:translateY(-5px)}
.tut-lang a:hover .ln-name{color:var(--cream-50)}
.tut-lang a:hover .ln-desc{color:var(--cream-200)}
.tut-lang .ln-ic{width:46px;height:46px;border-radius:12px;background:var(--cream-200);display:flex;
  align-items:center;justify-content:center;color:var(--brown-700);transition:background .35s var(--ease),color .35s var(--ease)}
.tut-lang a:hover .ln-ic{background:var(--pink-400);color:#fff}
.tut-lang .ln-name{font-family:var(--f-serif);font-weight:700;color:var(--brown-900);font-size:1.05rem}
.tut-lang .ln-desc{font-family:var(--f-mono);font-size:.72rem;color:var(--muted);letter-spacing:.04em}


/* ==========================================================================
   2. articles.html —— 编辑型错落网格（art-）
   ========================================================================== */

/* 顶部分类筛选 chip */
.art-filter{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:42px}
.art-chip{
  font-family:var(--f-mono);font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;
  font-weight:700;padding:9px 18px;border-radius:24px;border:1.5px solid var(--line);
  color:var(--brown-600);background:var(--cream-50);cursor:pointer;
  transition:all .3s var(--ease);
}
.art-chip:hover{border-color:var(--pink-300);color:var(--pink-500)}
.art-chip.on{background:var(--brown-800);border-color:var(--brown-800);color:var(--cream-50)}

/* 错落网格：6 列 4 行，头条占 2x2 */
.art-grid{display:grid;grid-template-columns:repeat(6,1fr);grid-auto-rows:200px;gap:24px}
.art-head{
  grid-column:span 4;grid-row:span 2;display:grid;grid-template-columns:1.1fr 1fr;
  background:var(--cream-50);border:1px solid var(--line);border-radius:var(--radius-lg);
  overflow:hidden;box-shadow:var(--shadow-sm);transition:transform .4s var(--ease),box-shadow .4s var(--ease);
}
.art-head:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.art-head .ah-img{position:relative;overflow:hidden}
.art-head .ah-img img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.art-head:hover .ah-img img{transform:scale(1.05)}
.art-head .ah-img .ah-badge{position:absolute;top:18px;left:18px;background:var(--pink-400);color:#fff;
  font-family:var(--f-mono);font-size:.72rem;letter-spacing:.12em;font-weight:700;padding:6px 14px;border-radius:18px}
.art-head .ah-body{padding:30px 32px;display:flex;flex-direction:column;justify-content:center}
.art-head .ah-body h3{font-size:1.7rem;line-height:1.3;margin:12px 0}
.art-head .ah-body p{color:var(--brown-600);font-size:.96rem;line-height:1.7}
.art-author{display:flex;align-items:center;gap:10px;margin-top:18px}
.art-author img{width:38px;height:38px;border-radius:50%;object-fit:cover}
.art-author .nm{font-weight:600;font-size:.88rem;color:var(--brown-800)}
.art-author .rt{font-family:var(--f-mono);font-size:.74rem;color:var(--muted)}

/* 小博文卡片，错落占据不同行列 */
.art-card{
  background:var(--cream-50);border:1px solid var(--line);border-radius:var(--radius-lg);
  overflow:hidden;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;
  transition:transform .4s var(--ease),box-shadow .4s var(--ease);
}
.art-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.art-card .ac-img{height:120px;overflow:hidden}
.art-card .ac-img img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.art-card:hover .ac-img img{transform:scale(1.06)}
.art-card .ac-body{padding:18px 20px;display:flex;flex-direction:column;gap:8px;flex:1}
.art-card .ac-cat{font-family:var(--f-mono);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--coffee);font-weight:700}
.art-card h4{font-family:var(--f-sans);font-size:1.02rem;font-weight:600;line-height:1.45;color:var(--brown-800)}
.art-card .ac-ex{font-size:.82rem;color:var(--muted);line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.art-card .ac-foot{display:flex;justify-content:space-between;align-items:center;margin-top:auto;padding-top:8px;
  border-top:1px dashed var(--line);font-family:var(--f-mono);font-size:.74rem;color:var(--muted)}
/* 6 张小卡：各自跨度不同，形成不规则 */
.art-card.c1{grid-column:span 2;grid-row:span 1}
.art-card.c2{grid-column:span 2;grid-row:span 2}
.art-card.c3{grid-column:span 2;grid-row:span 1}
.art-card.c4{grid-column:span 3;grid-row:span 1}
.art-card.c5{grid-column:span 3;grid-row:span 1}
.art-card.c6{grid-column:span 6;grid-row:span 1;flex-direction:row}
.art-card.c6 .ac-img{width:240px;height:auto;flex:none}
.art-card.c6 .ac-body{padding:22px 26px}


/* ==========================================================================
   3. qa.html —— 问答手风琴列表（qa-）
   ========================================================================== */

.qa-list{display:flex;flex-direction:column;gap:14px;max-width:920px;margin-inline:auto}
.qa-item{
  background:var(--cream-50);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;transition:border-color .3s var(--ease),box-shadow .3s var(--ease);
}
.qa-item.open{border-color:var(--pink-300);box-shadow:var(--shadow-sm)}
.qa-q{
  display:grid;grid-template-columns:64px 1fr auto;align-items:center;gap:18px;
  padding:22px 26px;cursor:pointer;background:none;width:100%;text-align:left;
}
.qa-q .qno{
  font-family:var(--f-serif);font-size:1.9rem;font-weight:700;color:var(--cream-300);
  line-height:1;transition:color .3s var(--ease);
}
.qa-item.open .qa-q .qno{color:var(--pink-400)}
.qa-q .qtt{font-family:var(--f-sans);font-size:1.06rem;font-weight:600;color:var(--brown-800);line-height:1.5}
.qa-q .qic{
  width:32px;height:32px;border-radius:50%;border:1.5px solid var(--line);
  display:flex;align-items:center;justify-content:center;color:var(--brown-600);
  transition:all .35s var(--ease);flex:none;
}
.qa-item.open .qa-q .qic{background:var(--pink-300);border-color:var(--pink-300);color:#fff;transform:rotate(45deg)}

/* 答案折叠区 */
.qa-a{max-height:0;overflow:hidden;transition:max-height .45s var(--ease)}
.qa-a-inner{padding:0 26px 26px 108px;border-top:1px dashed var(--line);margin-top:-1px;padding-top:22px}
.qa-a-inner .alabel{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--coffee);font-weight:700;margin-bottom:10px;display:flex;align-items:center;gap:8px}
.qa-a-inner .alabel::before{content:"";width:16px;height:2px;background:var(--coffee)}
.qa-a-inner p{color:var(--brown-700);line-height:1.85;margin-bottom:14px}
.qa-code{
  background:var(--brown-900);border-radius:10px;padding:18px 22px;overflow-x:auto;
  font-family:var(--f-mono);font-size:.84rem;color:var(--cream-200);line-height:1.7;
  border-left:3px solid var(--pink-300);
}
.qa-code .ck{color:var(--latte)}     /* 关键字 */
.qa-code .cs{color:#9CB89C}          /* 字符串 */
.qa-code .cc{color:var(--muted);font-style:italic} /* 注释 */
.qa-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.qa-tags span{font-family:var(--f-mono);font-size:.7rem;letter-spacing:.08em;color:var(--coffee);
  background:var(--cream-200);padding:4px 10px;border-radius:14px}

/* CTA 提问 */
.qa-cta{display:grid;grid-template-columns:1.4fr 1fr;gap:36px;align-items:center;
  background:linear-gradient(135deg,var(--brown-800),var(--brown-600));border-radius:var(--radius-lg);
  padding:42px 48px;color:var(--cream-100)}
.qa-cta h3{color:#fff}
.qa-cta p{color:var(--cream-200);margin-top:8px}
.qa-cta .qa-cta-btns{display:flex;flex-direction:column;gap:12px}


/* ==========================================================================
   4. interview.html —— 公司徽标+题目卡片网格（int-）
   ========================================================================== */

/* 公司筛选条 */
.int-comps{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-bottom:46px}
.int-comp{
  display:flex;flex-direction:column;align-items:center;gap:8px;min-width:104px;
  padding:16px 18px;border-radius:var(--radius);background:var(--cream-50);border:1.5px solid var(--line);
  cursor:pointer;transition:all .35s var(--ease);
}
.int-comp:hover{border-color:var(--pink-300);transform:translateY(-3px)}
.int-comp.on{background:var(--brown-800);border-color:var(--brown-800)}
.int-comp.on .ic-name{color:var(--cream-50)}
.int-comp.on .ic-cnt{color:var(--latte)}
.int-comp .ic-logo{width:42px;height:42px;border-radius:10px;display:flex;align-items:center;
  justify-content:center;font-family:var(--f-serif);font-weight:700;font-size:1.2rem;color:#fff}
.int-comp .ic-name{font-family:var(--f-sans);font-weight:600;font-size:.92rem;color:var(--brown-800)}
.int-comp .ic-cnt{font-family:var(--f-mono);font-size:.7rem;color:var(--muted)}

/* 题目网格 3 列 */
.int-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.int-card{
  background:var(--cream-50);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:26px 26px 22px;display:flex;flex-direction:column;gap:14px;position:relative;
  box-shadow:var(--shadow-sm);transition:transform .4s var(--ease),box-shadow .4s var(--ease),border-color .3s var(--ease);
}
.int-card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:var(--pink-300)}
.int-card .ic-top{display:flex;justify-content:space-between;align-items:center}
.int-card .ic-co{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;
  font-weight:700;padding:5px 12px;border-radius:16px}
.int-card .ic-co.bytedance{background:#E8F0FF;color:#3370FF}
.int-card .ic-co.alibaba{background:#FFF4E6;color:#FF6A00}
.int-card .ic-co.tencent{background:#E6FAF0;color:#0FA958}
.int-card .ic-co.meituan{background:#FFF0D9;color:#FFB300}
.int-card .ic-co.baidu{background:#E4F0FF;color:#2932E1}
.int-card .ic-diff{font-family:var(--f-mono);font-size:.72rem;font-weight:700;padding:4px 10px;border-radius:6px}
.int-card .ic-diff.easy{background:#E8F5E8;color:#3B7A3B}
.int-card .ic-diff.mid{background:#FFF4E0;color:#B8860B}
.int-card .ic-diff.hard{background:#FBE4E0;color:#B83A2E}
.int-card h3{font-family:var(--f-sans);font-size:1.12rem;font-weight:600;line-height:1.45;color:var(--brown-900)}
.int-card .ic-points{display:flex;flex-direction:column;gap:6px;padding:14px 16px;background:var(--cream-100);border-radius:10px}
.int-card .ic-points .pl{font-family:var(--f-mono);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;color:var(--coffee);font-weight:700;margin-bottom:2px}
.int-card .ic-points li{font-size:.84rem;color:var(--brown-600);padding-left:14px;position:relative;line-height:1.55}
.int-card .ic-points li::before{content:"";position:absolute;left:0;top:9px;width:5px;height:5px;border-radius:50%;background:var(--latte)}
.int-card .ic-foot{display:flex;justify-content:space-between;align-items:center;margin-top:auto;padding-top:6px}
.int-card .ic-meta{font-family:var(--f-mono);font-size:.72rem;color:var(--muted)}
.int-card .ic-link{font-family:var(--f-mono);font-size:.76rem;letter-spacing:.08em;font-weight:700;color:var(--pink-500)}
.int-card .ic-link::after{content:" →";transition:margin .3s var(--ease)}
.int-card:hover .ic-link::after{margin-left:4px}


/* ==========================================================================
   5. projects.html —— 案例画廊（proj-）
   ========================================================================== */

.proj-gallery{display:flex;flex-direction:column;gap:54px}
.proj-case{
  display:grid;grid-template-columns:1.05fr 1fr;gap:0;background:var(--cream-50);
  border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-sm);
  transition:transform .4s var(--ease),box-shadow .4s var(--ease);
}
.proj-case:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
/* 交替左右 */
.proj-case:nth-child(even){grid-template-columns:1fr 1.05fr}
.proj-case:nth-child(even) .pc-img{order:2}
.proj-case:nth-child(even) .pc-body{order:1}
.proj-case .pc-img{position:relative;overflow:hidden;min-height:340px}
.proj-case .pc-img img{width:100%;height:100%;object-fit:cover;transition:transform .7s var(--ease)}
.proj-case:hover .pc-img img{transform:scale(1.05)}
.proj-case .pc-img .pc-num{position:absolute;top:22px;left:22px;font-family:var(--f-serif);font-size:3.2rem;
  font-weight:700;color:#fff;line-height:1;text-shadow:0 4px 20px rgba(0,0,0,.4)}
.proj-case .pc-body{padding:38px 40px;display:flex;flex-direction:column;gap:16px}
.proj-case .pc-cat{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--coffee);font-weight:700;display:flex;align-items:center;gap:10px}
.proj-case .pc-cat::before{content:"";width:20px;height:2px;background:var(--coffee)}
.proj-case h3{font-family:var(--f-serif);font-size:1.6rem;color:var(--brown-900);line-height:1.3}
.proj-case .pc-intro{color:var(--brown-600);font-size:.96rem;line-height:1.7}
.proj-case .pc-stack{display:flex;flex-wrap:wrap;gap:8px}
.proj-case .pc-stack span{font-family:var(--f-mono);font-size:.72rem;font-weight:600;padding:5px 11px;
  border-radius:14px;background:var(--cream-200);color:var(--coffee)}
.proj-case .pc-metrics{display:flex;gap:30px;padding:18px 22px;background:var(--cream-100);border-radius:12px;margin-top:4px}
.proj-case .pc-metrics .pm b{font-family:var(--f-serif);font-size:1.9rem;color:var(--brown-800);line-height:1;display:block}
.proj-case .pc-metrics .pm span{font-family:var(--f-mono);font-size:.72rem;color:var(--muted);letter-spacing:.06em;margin-top:4px;display:block}
.proj-case .pc-link{display:inline-flex;align-items:center;gap:8px;font-family:var(--f-mono);font-size:.8rem;
  letter-spacing:.1em;text-transform:uppercase;font-weight:700;color:var(--pink-500);margin-top:6px;width:fit-content}
.proj-case .pc-link::after{content:"→";transition:transform .3s var(--ease)}
.proj-case:hover .pc-link::after{transform:translateX(5px)}


/* ==========================================================================
   6. roadmap.html —— 纵向时间线路线图（rm-）
   ========================================================================== */

.rm-timeline{position:relative;padding:20px 0 10px;max-width:1080px;margin-inline:auto}
/* 左侧竖线 */
.rm-timeline::before{
  content:"";position:absolute;left:32px;top:30px;bottom:30px;width:3px;
  background:linear-gradient(var(--latte),var(--coffee),var(--brown-700));
  border-radius:2px;
}
.rm-node{position:relative;padding-left:88px;margin-bottom:48px}
.rm-node:last-child{margin-bottom:0}
/* 圆点节点 */
.rm-node::before{
  content:"";position:absolute;left:18px;top:6px;width:30px;height:30px;border-radius:50%;
  background:var(--cream-50);border:4px solid var(--pink-400);box-shadow:0 0 0 5px var(--cream-100);
  z-index:2;
}
.rm-node:nth-child(1)::before{border-color:var(--latte);background:var(--latte)}
.rm-node:nth-child(2)::before{border-color:var(--pink-300);background:var(--pink-300)}
.rm-node:nth-child(3)::before{border-color:var(--coffee);background:var(--coffee)}
.rm-node:nth-child(4)::before{border-color:var(--brown-600);background:var(--brown-600)}
.rm-node:nth-child(5)::before{border-color:var(--brown-800);background:var(--brown-800)}

.rm-card{background:var(--cream-50);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:30px 34px;box-shadow:var(--shadow-sm);transition:transform .4s var(--ease),box-shadow .4s var(--ease)}
.rm-card:hover{transform:translateX(6px);box-shadow:var(--shadow)}
.rm-head{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;flex-wrap:wrap;margin-bottom:22px;
  padding-bottom:18px;border-bottom:1px dashed var(--line)}
.rm-head .rm-stage-no{font-family:var(--f-mono);font-size:.74rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--coffee);font-weight:700}
.rm-head h3{font-family:var(--f-serif);font-size:1.6rem;color:var(--brown-900);margin-top:6px;line-height:1.3}
.rm-head .rm-period{font-family:var(--f-mono);font-size:.78rem;color:var(--cream-50);font-weight:700;
  background:var(--brown-800);padding:7px 14px;border-radius:18px;white-space:nowrap}
.rm-body{display:grid;grid-template-columns:1.4fr 1fr;gap:30px}
.rm-skills .rm-sub{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--coffee);font-weight:700;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.rm-skills .rm-sub svg{width:15px;height:15px}
.rm-skills ul{display:grid;grid-template-columns:1fr 1fr;gap:8px 16px}
.rm-skills li{font-size:.9rem;color:var(--brown-700);padding-left:20px;position:relative;line-height:1.55}
.rm-skills li::before{content:"";position:absolute;left:0;top:9px;width:8px;height:8px;border-radius:2px;
  background:var(--pink-300);transform:rotate(45deg)}
.rm-side{display:flex;flex-direction:column;gap:18px}
.rm-proj{background:var(--cream-100);border-radius:12px;padding:16px 18px}
.rm-proj .rm-sub{margin-bottom:10px}
.rm-proj p{font-size:.86rem;color:var(--brown-700);line-height:1.6;padding-left:18px;position:relative}
.rm-proj p::before{content:"▸";position:absolute;left:0;color:var(--pink-400)}
.rm-proj p+p{margin-top:4px}
.rm-res{display:flex;flex-direction:column;gap:6px}
.rm-res .rm-sub{margin-bottom:8px}
.rm-res a{font-size:.84rem;color:var(--brown-700);padding:6px 0;border-bottom:1px dashed var(--line);
  display:flex;justify-content:space-between;align-items:center}
.rm-res a::after{content:"↗";color:var(--pink-400);font-size:.9rem}
.rm-res a:hover{color:var(--pink-500)}


/* ==========================================================================
   7. knowledge.html —— 知识领域网格（know-）
   ========================================================================== */

.know-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.know-card{
  background:var(--cream-50);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:30px 28px;display:flex;flex-direction:column;gap:18px;position:relative;overflow:hidden;
  box-shadow:var(--shadow-sm);transition:transform .4s var(--ease),box-shadow .4s var(--ease);
}
.know-card::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:var(--latte)}
.know-card:nth-child(1)::before{background:var(--pink-300)}
.know-card:nth-child(2)::before{background:var(--coffee)}
.know-card:nth-child(3)::before{background:var(--latte)}
.know-card:nth-child(4)::before{background:var(--brown-600)}
.know-card:nth-child(5)::before{background:var(--pink-400)}
.know-card:nth-child(6)::before{background:var(--coffee)}
.know-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.know-head{display:flex;align-items:center;gap:14px}
.know-ic{width:48px;height:48px;border-radius:12px;background:var(--cream-200);display:flex;
  align-items:center;justify-content:center;color:var(--brown-700);flex:none}
.know-card:nth-child(1) .know-ic{background:var(--pink-200);color:var(--pink-500)}
.know-card:nth-child(4) .know-ic{background:var(--brown-800);color:var(--latte)}
.know-head h3{font-family:var(--f-serif);font-size:1.25rem;color:var(--brown-900);line-height:1.3}
.know-head .kh-en{font-family:var(--f-mono);font-size:.68rem;letter-spacing:.12em;color:var(--muted);
  text-transform:uppercase;display:block;margin-top:2px}
.know-list{display:flex;flex-direction:column;gap:9px}
.know-check{display:flex;align-items:center;gap:10px;font-size:.88rem;color:var(--brown-700);line-height:1.5}
.know-check .kc-box{width:18px;height:18px;border-radius:5px;border:1.5px solid var(--latte);flex:none;
  display:flex;align-items:center;justify-content:center;background:var(--cream-50);transition:all .3s var(--ease)}
.know-check.done .kc-box{background:var(--pink-400);border-color:var(--pink-400)}
.know-check.done .kc-box svg{opacity:1}
.know-check .kc-box svg{width:11px;height:11px;color:#fff;opacity:0;transition:opacity .3s var(--ease)}
.know-check.done{color:var(--brown-800)}
.know-check:not(.done){color:var(--muted)}
/* 进度条 */
.know-progress{margin-top:auto;padding-top:14px;border-top:1px dashed var(--line)}
.know-progress .kp-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.know-progress .kp-label{font-family:var(--f-mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--coffee);font-weight:700}
.know-progress .kp-pct{font-family:var(--f-serif);font-size:1.15rem;font-weight:700;color:var(--brown-800)}
.know-bar{height:7px;border-radius:4px;background:var(--cream-200);overflow:hidden}
.know-bar i{display:block;height:100%;border-radius:4px;background:linear-gradient(90deg,var(--pink-300),var(--pink-500))}


/* ==========================================================================
   8. resources.html —— 资源目录（res-）
   ========================================================================== */

.res-cat-bar{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:40px;justify-content:center}
.res-cat-pill{
  display:flex;align-items:center;gap:8px;padding:10px 18px;border-radius:24px;
  background:var(--cream-50);border:1.5px solid var(--line);font-family:var(--f-mono);font-size:.78rem;
  letter-spacing:.08em;font-weight:700;color:var(--brown-600);transition:all .3s var(--ease)
}
.res-cat-pill .rp-cnt{font-size:.68rem;color:var(--muted);background:var(--cream-200);padding:2px 8px;border-radius:10px}
.res-cat-pill:hover{border-color:var(--pink-300);color:var(--pink-500)}

/* 两列区块 */
.res-cols{display:grid;grid-template-columns:1fr 1fr;gap:36px}
.res-group{background:var(--cream-50);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:30px 32px;box-shadow:var(--shadow-sm)}
.res-group-head{display:flex;align-items:center;gap:14px;margin-bottom:24px;padding-bottom:18px;border-bottom:2px solid var(--cream-200)}
.res-group-head .rg-ic{width:42px;height:42px;border-radius:10px;display:flex;align-items:center;
  justify-content:center;color:#fff;flex:none}
.res-group.book .rg-ic{background:var(--coffee)}
.res-group.tool .rg-ic{background:var(--pink-400)}
.res-group.repo .rg-ic{background:var(--brown-800)}
.res-group.course .rg-ic{background:var(--latte);color:var(--brown-800)}
.res-group-head h3{font-family:var(--f-serif);font-size:1.32rem;color:var(--brown-900)}
.res-group-head .rg-en{font-family:var(--f-mono);font-size:.7rem;letter-spacing:.12em;color:var(--muted);
  text-transform:uppercase;display:block;margin-top:2px}
.res-list{display:flex;flex-direction:column;gap:14px}
.res-item{display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center;
  padding:16px 18px;border-radius:12px;background:var(--cream-100);transition:background .3s var(--ease),transform .3s var(--ease)}
.res-item:hover{background:var(--cream-200);transform:translateX(4px)}
.res-item .ri-info h4{font-family:var(--f-sans);font-size:1rem;font-weight:600;color:var(--brown-800);line-height:1.45;
  display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.res-item .ri-info p{font-size:.82rem;color:var(--muted);margin-top:4px;line-height:1.55}
.res-item .ri-tag{font-family:var(--f-mono);font-size:.66rem;letter-spacing:.08em;font-weight:700;
  padding:3px 9px;border-radius:12px;text-transform:uppercase}
/* 类型 tag 配色 */
.ri-tag.book{background:#F0E6D6;color:var(--coffee)}
.ri-tag.classic{background:var(--brown-800);color:var(--latte)}
.ri-tag.tool{background:#FFE6DE;color:var(--pink-500)}
.ri-tag.cli{background:#E6F0E6;color:#3B7A3B}
.ri-tag.repo{background:#E0E6F0;color:#3D5A99}
.ri-tag.framework{background:#F0E6E0;color:var(--brown-600)}
.ri-tag.course{background:#FFF0D9;color:#B8860B}
.ri-tag.free{background:#E6FAF0;color:#0FA958}
.res-item .ri-go{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.08em;font-weight:700;
  color:var(--cream-50);background:var(--brown-700);padding:8px 14px;border-radius:18px;white-space:nowrap;
  transition:background .3s var(--ease)}
.res-item:hover .ri-go{background:var(--pink-400)}


/* ==========================================================================
   通用响应式补丁（各页面）
   ========================================================================== */
@media (max-width:1024px){
  /* tutorials */
  .tut-stage{grid-template-columns:1fr;gap:22px;margin-right:0;margin-left:0}
  .tut-stage::after{display:none}
  .tut-stage-head{border-right:0;border-bottom:1px dashed var(--line);padding-right:0;padding-bottom:18px}
  .tut-lang{grid-template-columns:repeat(3,1fr)}
  /* articles */
  .art-grid{grid-template-columns:repeat(4,1fr);grid-auto-rows:180px}
  .art-head{grid-column:span 4}
  .art-card.c1,.art-card.c2,.art-card.c3{grid-column:span 2}
  .art-card.c4,.art-card.c5{grid-column:span 2}
  .art-card.c6{grid-column:span 4;flex-direction:column}
  .art-card.c6 .ac-img{width:100%;height:160px}
  /* interview */
  .int-grid{grid-template-columns:repeat(2,1fr)}
  /* projects */
  .proj-case,.proj-case:nth-child(even){grid-template-columns:1fr}
  .proj-case:nth-child(even) .pc-img{order:0}
  .proj-case:nth-child(even) .pc-body{order:0}
  .proj-case .pc-img{min-height:240px}
  /* knowledge */
  .know-grid{grid-template-columns:repeat(2,1fr)}
  /* resources */
  .res-cols{grid-template-columns:1fr}
  /* roadmap */
  .rm-body{grid-template-columns:1fr;gap:22px}
}
@media (max-width:860px){
  /* tutorials */
  .tut-lang{grid-template-columns:repeat(2,1fr)}
  .tut-course{grid-template-columns:1fr;gap:8px;align-items:flex-start}
  .tut-course .go{margin-top:4px}
  /* articles */
  .art-grid{grid-template-columns:1fr;grid-auto-rows:auto}
  .art-head,.art-card.c1,.art-card.c2,.art-card.c3,.art-card.c4,.art-card.c5,.art-card.c6{grid-column:span 1;grid-row:auto}
  .art-head{grid-template-columns:1fr}
  .art-head .ah-img{height:220px}
  .art-card.c6{flex-direction:column}
  .art-card.c6 .ac-img{width:100%;height:160px}
  .art-card .ac-img{height:160px}
  /* qa */
  .qa-q{grid-template-columns:48px 1fr 32px;gap:14px;padding:18px 20px}
  .qa-a-inner{padding:18px 20px 22px 82px}
  .qa-cta{grid-template-columns:1fr;padding:30px 28px;gap:22px}
  /* interview */
  .int-grid{grid-template-columns:1fr}
  .int-comps{gap:10px}
  .int-comp{min-width:88px;padding:12px 14px}
  /* projects */
  .proj-case .pc-body{padding:28px 24px}
  .proj-case .pc-metrics{gap:20px}
  /* roadmap */
  .rm-timeline::before{left:18px}
  .rm-node{padding-left:60px}
  .rm-node::before{left:4px}
  .rm-head{flex-direction:column;align-items:flex-start;gap:8px}
  .rm-body{grid-template-columns:1fr}
  .rm-skills ul{grid-template-columns:1fr}
  /* knowledge */
  .know-grid{grid-template-columns:1fr}
  /* resources */
  .res-item{grid-template-columns:1fr;gap:12px}
  .res-item .ri-go{justify-self:start}
}
@media (max-width:520px){
  .tut-stage-num{font-size:3.2rem}
  .qa-q .qno{font-size:1.5rem}
  .qa-a-inner{padding:16px 18px 20px 18px}
  .proj-case .pc-metrics{flex-wrap:wrap;gap:18px}
  .rm-card{padding:24px 22px}
  .res-group{padding:24px 22px}
}