/*
Theme Name: Horu Academy
Theme URI: https://horu.world
Author: horu.world
Author URI: https://horu.world
Description: Horu.world 灵感广场——AI 教程与系列课程主题。沿用官网淡紫视觉，按「分类=系列、文章=课时」组织，首页 Tab + 卡片流，课时页自动目录与上下节导航。
Version: 1.4.1
Requires at least: 6.0
Tested up to: 6.7
Requires PHP: 7.4
License: GNU General Public License v2 or later
Text Domain: horu-academy
*/

/* ============================================================
   设计 token —— 与官网完全一致
   ============================================================ */
:root{
  --background:#F9F8FC; --foreground:#1E1C2E; --card:#FFFFFF;
  --muted:#F4F2FB; --muted-foreground:#9490A9;
  --primary:#7C6FCD; --primary-foreground:#FFFFFF;
  --secondary:#F0EEF9; --accent:#B4A7E5; --border:rgba(180,167,229,.22);
  --blue-bg:#DFF0F9; --blue:#4D9DC0; --purple-bg:#EDE9FB; --purple:#7C6FCD;
  --green-bg:#E2F5EB; --green:#4DA872; --orange-bg:#FBF0E4; --orange:#C4784A;
  --radius:1rem;
  --font-cjk:"PingFang SC","MiSans","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  --font-display:"Plus Jakarta Sans",var(--font-cjk);
  --ease:cubic-bezier(.16,1,.3,1);
}
*{margin:0;padding:0;box-sizing:border-box}
html{font-size:16px;-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{font-family:var(--font-cjk);background:var(--background);color:var(--foreground);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
.display{font-family:var(--font-display)}
.wrap{max-width:72rem;margin:0 auto;padding-inline:1.5rem}
.wrap-narrow{max-width:48rem;margin:0 auto;padding-inline:1.5rem}

/* ============================================================
   顶部导航
   ============================================================ */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:blur(16px);border-bottom:1px solid var(--border)}
.nav-inner{height:4rem;display:flex;align-items:center;justify-content:space-between;gap:1rem}
.brand{display:inline-flex;align-items:center;gap:.6rem}
.brand img{height:26px;width:auto}
.brand .sub{font-size:.95rem;font-weight:600;color:var(--muted-foreground);border-left:1px solid var(--border);padding-left:.6rem}
.nav-menu{display:flex;align-items:center;gap:1.6rem;list-style:none}
.nav-menu a{font-size:.9rem;color:var(--muted-foreground);transition:color .2s;position:relative}
.nav-menu a:hover,.nav-menu .current-menu-item>a{color:var(--foreground)}
.nav-right{display:flex;align-items:center;gap:.85rem}
.back-site{display:inline-flex;align-items:center;gap:.35rem;font-size:.85rem;color:var(--muted-foreground)}
.back-site:hover{color:var(--primary)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;padding:.55rem 1.25rem;border-radius:999px;font-weight:600;font-size:.85rem;cursor:pointer;border:none;transition:transform .2s var(--ease),box-shadow .2s,background .2s}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 8px 24px rgba(124,111,205,.25)}
.btn-primary:hover{transform:scale(1.04);box-shadow:0 12px 32px rgba(124,111,205,.4)}
.btn-ghost{background:#fff;color:var(--foreground);border:1px solid var(--border)}
.btn-ghost:hover{background:var(--secondary)}
.burger{display:none;background:none;border:none;cursor:pointer;color:var(--foreground)}
.nav-mobile{display:none;flex-direction:column;gap:.25rem;padding:.75rem 1.5rem 1.25rem;background:#fff;border-bottom:1px solid var(--border)}
.nav-mobile a{padding:.6rem 0;font-size:.95rem;border-bottom:1px solid var(--border)}

/* ============================================================
   首页 Hero banner
   ============================================================ */
.hero{position:relative;overflow:hidden;padding:4.5rem 0 2.5rem;text-align:center}
.hero .blob{position:absolute;border-radius:50%;filter:blur(90px);pointer-events:none}
.hero .blob1{width:420px;height:420px;top:-8rem;right:-6rem;background:rgba(180,167,229,.16)}
.hero .blob2{width:320px;height:320px;bottom:-6rem;left:-6rem;background:rgba(167,208,229,.13)}
.hero-eyebrow{display:inline-flex;align-items:center;gap:.4rem;padding:.35rem .9rem;border-radius:999px;background:var(--secondary);color:var(--primary);font-size:.75rem;font-weight:600;border:1px solid rgba(180,167,229,.3);margin-bottom:1.25rem}
.hero h1{font-size:clamp(1.9rem,5vw,3rem);font-weight:800;line-height:1.15;letter-spacing:-.02em;position:relative}
.hero h1 .accent{color:var(--primary)}
.hero p{margin-top:1rem;color:var(--muted-foreground);font-size:clamp(1rem,2vw,1.15rem);position:relative}

/* ============================================================
   分类 Tab
   ============================================================ */
.tabs{position:sticky;top:4rem;z-index:40;background:rgba(249,248,252,.9);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);margin-bottom:2.5rem}
.tabs-inner{display:flex;gap:.5rem;overflow-x:auto;padding:.85rem 0;scrollbar-width:none}
.tabs-inner::-webkit-scrollbar{display:none}
.tab{flex:0 0 auto;padding:.45rem 1.1rem;border-radius:999px;font-size:.85rem;font-weight:600;color:var(--muted-foreground);background:transparent;border:1px solid transparent;cursor:pointer;white-space:nowrap;transition:all .2s}
.tab:hover{color:var(--foreground);background:var(--secondary)}
.tab.active{color:#fff;background:var(--primary);box-shadow:0 6px 18px rgba(124,111,205,.3)}

/* ============================================================
   卡片网格
   ============================================================ */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem;padding-bottom:4rem}
.card{display:flex;flex-direction:column;background:var(--card);border:1px solid var(--border);border-radius:1.25rem;overflow:hidden;transition:transform .3s var(--ease),box-shadow .3s,border-color .3s}
.card:hover{transform:translateY(-6px);box-shadow:0 20px 48px -10px rgba(124,111,205,.2);border-color:rgba(180,167,229,.5)}
.card-cover{position:relative;aspect-ratio:16/9;background:linear-gradient(135deg,var(--purple-bg),var(--blue-bg));overflow:hidden}
.card-cover img{width:100%;height:100%;object-fit:cover}
.card-cover .ph{width:100%;height:100%;display:flex;align-items:center;justify-content:center;color:var(--accent);font-size:2.5rem;font-weight:800;font-family:var(--font-display)}
.badge{position:absolute;top:.7rem;left:.7rem;display:inline-flex;align-items:center;gap:.25rem;padding:.2rem .6rem;border-radius:999px;font-size:.7rem;font-weight:700;backdrop-filter:blur(6px)}
.badge-video{background:rgba(124,111,205,.92);color:#fff}
.badge-text{background:rgba(255,255,255,.92);color:var(--primary)}
.card-body{padding:1.1rem 1.2rem 1.3rem;display:flex;flex-direction:column;flex:1}
.card-cat{font-size:.72rem;font-weight:700;color:var(--primary);margin-bottom:.5rem;letter-spacing:.02em}
.card-title{font-size:1.02rem;font-weight:600;line-height:1.45;margin-bottom:.5rem}
.card-excerpt{font-size:.85rem;color:var(--muted-foreground);line-height:1.65;flex:1;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{display:flex;align-items:center;gap:.6rem;margin-top:.9rem;font-size:.72rem;color:var(--muted-foreground)}
.card-meta .dot{width:3px;height:3px;border-radius:50%;background:var(--accent)}
.empty{grid-column:1/-1;text-align:center;color:var(--muted-foreground);padding:3rem 0}

/* ============================================================
   系列页（分类归档）
   ============================================================ */
.series-hero{background:linear-gradient(135deg,var(--purple-bg),var(--secondary));border-bottom:1px solid var(--border);padding:3rem 0}
.series-hero .eyebrow{display:inline-block;padding:.3rem .8rem;border-radius:999px;background:#fff;color:var(--primary);font-size:.72rem;font-weight:700;margin-bottom:.9rem}
.series-hero h1{font-size:clamp(1.6rem,4vw,2.4rem);font-weight:800}
.series-hero p{margin-top:.8rem;color:var(--muted-foreground);max-width:42rem}
.series-hero .count{margin-top:1rem;font-size:.85rem;color:var(--primary);font-weight:600}
.lesson-list{padding:2.5rem 0 4rem;display:flex;flex-direction:column;gap:.75rem}
.lesson-row{display:flex;align-items:center;gap:1rem;padding:1rem 1.25rem;background:#fff;border:1px solid var(--border);border-radius:1rem;transition:transform .2s var(--ease),box-shadow .2s,border-color .2s}
.lesson-row:hover{transform:translateX(4px);box-shadow:0 12px 28px -10px rgba(124,111,205,.2);border-color:rgba(180,167,229,.5)}
.lesson-num{flex:0 0 auto;width:2rem;height:2rem;border-radius:.6rem;background:var(--secondary);color:var(--primary);font-weight:700;font-size:.85rem;display:flex;align-items:center;justify-content:center;font-family:var(--font-display)}
.lesson-info{flex:1;min-width:0}
.lesson-info h3{font-size:1rem;font-weight:600;margin-bottom:.2rem}
.lesson-info .m{font-size:.75rem;color:var(--muted-foreground)}
.lesson-type{flex:0 0 auto;font-size:.7rem;font-weight:700;padding:.2rem .55rem;border-radius:999px}

/* ============================================================
   课时页（单篇）
   ============================================================ */
.lesson-wrap{display:grid;grid-template-columns:1fr 18rem;gap:2.5rem;padding:2.5rem 0 4rem;align-items:start}
.lesson-main{min-width:0}
.crumb{font-size:.8rem;color:var(--muted-foreground);margin-bottom:1rem}
.crumb a{color:var(--primary)}
.lesson-main h1{font-size:clamp(1.6rem,3.5vw,2.2rem);font-weight:800;line-height:1.3;margin-bottom:.8rem}
.lesson-head-meta{display:flex;align-items:center;gap:.7rem;font-size:.8rem;color:var(--muted-foreground);margin-bottom:1.5rem;flex-wrap:wrap}
.content{font-size:1.02rem;line-height:1.85}
.content>*{margin-bottom:1.2rem}
.content h2{font-size:1.4rem;font-weight:700;margin-top:2rem}
.content h3{font-size:1.15rem;font-weight:700;margin-top:1.5rem}
.content a{color:var(--primary);text-decoration:underline;text-underline-offset:3px}
.content img,.content video{border-radius:.8rem}
.content pre{background:#1E1C2E;color:#EDEBF7;padding:1.1rem 1.25rem;border-radius:.8rem;overflow-x:auto;font-size:.875rem}
.content code{background:var(--muted);padding:.15rem .4rem;border-radius:.35rem;font-size:.9em}
.content pre code{background:none;padding:0}
.content blockquote{border-left:3px solid var(--accent);padding:.5rem 0 .5rem 1.2rem;color:var(--muted-foreground)}
.content ul,.content ol{padding-left:1.4rem}
.content li{margin-bottom:.4rem}
/* 响应式视频/嵌入（B站等 iframe）*/
.content iframe,.content .embed{width:100%;aspect-ratio:16/9;border:0;border-radius:.8rem}
.video-embed{position:relative;width:100%;aspect-ratio:16/9;border-radius:.8rem;overflow:hidden;margin-bottom:1.2rem;background:#000}
.video-embed iframe,.video-embed video{position:absolute;inset:0;width:100%;height:100%}

/* 上一节/下一节 */
.prevnext{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-top:2.5rem}
.pn{padding:1rem 1.2rem;border:1px solid var(--border);border-radius:1rem;background:#fff;transition:all .2s var(--ease)}
.pn:hover{border-color:var(--primary);box-shadow:0 10px 24px -10px rgba(124,111,205,.25)}
.pn .l{font-size:.72rem;color:var(--muted-foreground)}
.pn .t{font-size:.92rem;font-weight:600;margin-top:.25rem;display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;overflow:hidden}
.pn.next{text-align:right}

/* 侧栏：本系列目录 */
.lesson-side{position:sticky;top:5.5rem}
.side-card{background:#fff;border:1px solid var(--border);border-radius:1rem;overflow:hidden}
.side-card .h{padding:1rem 1.1rem;border-bottom:1px solid var(--border);font-weight:700;font-size:.9rem;display:flex;align-items:center;justify-content:space-between}
.side-card .h .c{font-size:.72rem;color:var(--muted-foreground);font-weight:600}
.side-list{max-height:60vh;overflow-y:auto}
.side-item{display:flex;gap:.6rem;padding:.7rem 1.1rem;font-size:.85rem;border-bottom:1px solid var(--border);transition:background .2s}
.side-item:last-child{border-bottom:none}
.side-item:hover{background:var(--muted)}
.side-item.cur{background:var(--secondary)}
.side-item.cur .st{color:var(--primary);font-weight:600}
.side-item .sn{color:var(--accent);font-weight:700;font-family:var(--font-display);flex:0 0 auto}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{background:#fff;border-top:1px solid var(--border);padding:3rem 0;margin-top:2rem}
.footer-inner{display:flex;flex-wrap:wrap;gap:2rem;justify-content:space-between;align-items:flex-start}
.footer-brand img{height:26px;margin-bottom:.8rem}
.footer-brand p{font-size:.82rem;color:var(--muted-foreground);max-width:22rem;line-height:1.8}
.footer-links{display:flex;gap:2.5rem;flex-wrap:wrap}
.footer-col h4{font-size:.8rem;font-weight:700;margin-bottom:.8rem}
.footer-col a{display:block;font-size:.82rem;color:var(--muted-foreground);margin-bottom:.5rem;transition:color .2s}
.footer-col a:hover{color:var(--primary)}
.footer-bottom{border-top:1px solid var(--border);margin-top:2rem;padding-top:1.5rem;font-size:.75rem;color:var(--muted-foreground);text-align:center}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:900px){
  .card-grid{grid-template-columns:repeat(2,1fr)}
  .lesson-wrap{grid-template-columns:1fr}
  .side-list{max-height:none}
}
@media (max-width:768px){
  .nav-menu,.back-site{display:none}
  .burger{display:inline-flex}
  .site-header.open .nav-mobile{display:flex}
  .tabs{top:4rem}
}
@media (max-width:560px){
  .card-grid{grid-template-columns:1fr}
  .prevnext{grid-template-columns:1fr}
  .brand .sub{display:none}
}

/* ============================================================
   Banner 背景图模式
   ============================================================ */
.hero--image{padding:6rem 0 4rem;background-size:cover;background-position:center;color:#fff}
.hero--image .hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(30,28,46,.45),rgba(124,111,205,.55))}
.hero--image h1,.hero--image p{color:#fff;position:relative}
.hero--image .hero-eyebrow{position:relative;background:rgba(255,255,255,.2);color:#fff;border-color:rgba(255,255,255,.3)}
.hero--image h1 .accent{color:#E9E4FB}

/* ============================================================
   点赞条
   ============================================================ */
.like-bar{display:flex;align-items:center;gap:1rem;flex-wrap:wrap;margin-top:2.5rem;padding-top:2rem;border-top:1px solid var(--border)}
.like-btn{display:inline-flex;align-items:center;gap:.5rem;padding:.6rem 1.4rem;border-radius:999px;background:#fff;border:1.5px solid var(--border);color:var(--muted-foreground);font-weight:600;font-size:.9rem;cursor:pointer;transition:all .2s var(--ease)}
.like-btn:hover{border-color:var(--primary);color:var(--primary);transform:translateY(-2px)}
.like-btn .like-count{background:var(--secondary);color:var(--primary);padding:.05rem .5rem;border-radius:999px;font-size:.82rem}
.like-btn.liked{background:var(--primary);color:#fff;border-color:var(--primary)}
.like-btn.liked .like-count{background:rgba(255,255,255,.25);color:#fff}
.like-tip{font-size:.8rem;color:var(--muted-foreground)}

/* ============================================================
   评论区
   ============================================================ */
.comments-area{margin-top:3rem;padding-top:2rem;border-top:1px solid var(--border)}
.comments-title{font-size:1.2rem;font-weight:700;margin-bottom:1.5rem}
.comment-list{list-style:none;display:flex;flex-direction:column;gap:1.25rem;margin-bottom:2rem}
.comment-list ol{list-style:none;margin-top:1rem;margin-left:2rem}
.comment-body{background:#fff;border:1px solid var(--border);border-radius:1rem;padding:1.1rem 1.25rem}
.comment-author{display:flex;align-items:center;gap:.6rem;font-size:.9rem;font-weight:600;margin-bottom:.5rem}
.comment-author img{border-radius:50%}
.comment-author .says{display:none}
.comment-meta{font-size:.72rem;color:var(--muted-foreground);font-weight:400}
.comment-content{font-size:.92rem;line-height:1.7;color:var(--foreground)}
.comment-content p{margin-bottom:.5rem}
.reply{margin-top:.5rem}
.reply a{font-size:.78rem;color:var(--primary);font-weight:600}
.comment-respond{background:var(--muted);border-radius:1rem;padding:1.5rem}
.comment-reply-title{font-size:1.05rem;font-weight:700;margin-bottom:1rem}
.comment-form p{margin-bottom:.9rem}
.comment-form label{display:block;font-size:.82rem;color:var(--muted-foreground);margin-bottom:.35rem}
.comment-form input[type=text],.comment-form input[type=email],.comment-form input[type=url],.comment-form textarea{width:100%;padding:.7rem .9rem;border:1px solid var(--border);border-radius:.7rem;font-family:inherit;font-size:.9rem;background:#fff}
.comment-form input:focus,.comment-form textarea:focus{outline:none;border-color:var(--primary)}
.comment-form .form-submit{margin-bottom:0}
.comment-form .form-submit input{cursor:pointer}
.no-comments{color:var(--muted-foreground);font-size:.88rem}

/* 未登录评论入口 */
.login-to-comment{background:var(--muted);border:1px dashed rgba(180,167,229,.5);border-radius:1rem;padding:1.75rem;text-align:center}
.login-to-comment p{color:var(--muted-foreground);margin-bottom:1rem;font-size:.92rem}

/* ============================================================
   手机端课时目录抽屉
   ============================================================ */
.lesson-side-toggle,.lesson-side-backdrop{display:none}

@media (max-width:900px){
  .lesson-wrap{display:block}
  .lesson-main{width:100%}
  .lesson-side{
    position:fixed;
    inset:0 auto 0 0;
    z-index:1001;
    width:min(82vw,20rem);
    max-width:20rem;
    padding:4.75rem 1rem 1rem;
    background:linear-gradient(180deg,#fff,rgba(249,248,252,.98));
    box-shadow:18px 0 45px rgba(30,28,46,.16);
    transform:translateX(-105%);
    transition:transform .24s var(--ease);
    overflow-y:auto;
    -webkit-overflow-scrolling:touch;
  }
  .lesson-side.is-open{transform:translateX(0)}
  .lesson-side .side-card{border-radius:1.1rem;box-shadow:none}
  .lesson-side .side-list{max-height:none}
  .lesson-side-toggle{
    position:fixed;
    left:0;
    top:52%;
    z-index:1002;
    width:2.65rem;
    height:3.2rem;
    border:1px solid rgba(180,167,229,.42);
    border-left:0;
    border-radius:0 999px 999px 0;
    background:rgba(255,255,255,.94);
    color:var(--primary);
    box-shadow:0 12px 28px rgba(124,111,205,.18);
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:.18rem;
    flex-direction:column;
    transform:translateY(-50%);
    cursor:pointer;
    -webkit-tap-highlight-color:transparent;
  }
  .lesson-side-toggle span{
    width:1.05rem;
    height:2px;
    border-radius:999px;
    background:currentColor;
    transition:transform .2s var(--ease),opacity .2s var(--ease);
  }
  .lesson-side-toggle.is-open span:nth-child(1){transform:translateY(5px) rotate(45deg)}
  .lesson-side-toggle.is-open span:nth-child(2){opacity:0}
  .lesson-side-toggle.is-open span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
  .lesson-side-backdrop{
    position:fixed;
    inset:0;
    z-index:1000;
    border:0;
    background:rgba(30,28,46,.22);
    backdrop-filter:blur(2px);
    cursor:pointer;
  }
  .lesson-side-backdrop.is-open{display:block}
  body.lesson-drawer-open{overflow:hidden}
  body.admin-bar .lesson-side{padding-top:6.75rem}
}