/* =====================================================================
   home.css — Giao diện trang chủ (hero ảnh nền, bài nổi bật, chuyên mục,
   bài phổ biến, newsletter). Chỉ nạp ở posts/index.
   ===================================================================== */
.is-home,.is-list,.is-post{
  --hm-navy:#060d2a;
  --hm-primary:#1f6bff;
  --hm-primary-600:#1557e0;
  --header-h:68px;
  background:#f6f8fc;
}
:root[data-theme="dark"] .is-home,:root[data-theme="dark"] .is-list,:root[data-theme="dark"] .is-post{
  background:var(--paper);
}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;}
.hm-container{width:100%;max-width:1180px;margin-inline:auto;padding-inline:24px;}
/* ---------- HEADER trong suốt nằm trên hero ---------- */
.is-home .site-header{
  position:fixed;left:0;right:0;top:0;
  background:transparent;backdrop-filter:none;
  transition:background-color .25s;
}
.is-home .site-header-inner{border-bottom:0;padding-block:14px;gap:18px;max-width:1280px;}
.is-home .site-nav a{padding:8px 11px;}
.is-home .site-header.is-scrolled,
.is-home .site-header.open{
  background:rgba(6,13,42,.86);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
}
.is-home .site-brand{color:#fff;font-size:21px;}
.is-home .site-nav a{color:rgba(255,255,255,.82);font-weight:600;}
.is-home .site-nav a:hover{color:#fff;background:rgba(255,255,255,.08);}
.is-home .site-nav a.active{
  color:#fff;background:rgba(31,107,255,.32);
}
.is-home .site-search-btn{
  min-width:170px;justify-content:flex-start;
  background:rgba(255,255,255,.07);border-color:rgba(255,255,255,.14);color:rgba(255,255,255,.7);
}
.is-home .site-search-btn:hover{background:rgba(255,255,255,.12);color:#fff;}
.is-home .site-search-btn kbd{margin-left:auto;background:transparent;border-color:rgba(255,255,255,.2);color:rgba(255,255,255,.7);}
.is-home .site-actions .lnk{color:rgba(255,255,255,.9);font-weight:600;}
.is-home .site-actions .lnk:hover{color:#fff;background:rgba(255,255,255,.08);}
.is-home .site-actions .btn-cta{background:var(--hm-primary);}
.is-home .site-uname{color:#fff;}
/* nút tên tài khoản trên nền hero tối */
.is-home .user-dd-toggle:hover,.is-home .user-dd.open .user-dd-toggle{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.18);}
.is-home .user-dd-caret{color:rgba(255,255,255,.7);}
.is-home .site-burger{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.16);}
.is-home .site-burger span{background:#fff;}
@media (max-width:900px){
  .is-home .site-collapse{background:var(--hm-navy);border-bottom-color:rgba(255,255,255,.06);}
  .is-home .site-actions{border-top-color:rgba(255,255,255,.1);}
  .is-home .site-search-btn{min-width:0;}
}
/* ---------- BUTTONS ---------- */
.hm-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  height:44px;padding:0 20px;border-radius:12px;
  font-family:var(--sans);font-weight:700;font-size:14.5px;white-space:nowrap;text-decoration:none;
  border:1px solid transparent;cursor:pointer;
  transition:background-color .2s,border-color .2s,color .2s;
}
.hm-btn-primary{background:var(--hm-primary);color:#fff;}
.hm-btn-primary:hover{background:var(--hm-primary-600);}
.hm-btn-lg{height:52px;padding:0 22px 0 24px;border-radius:999px;font-size:15px;}
.hm-btn-lg .hm-arr{transition:transform .2s;}
.hm-btn-lg:hover .hm-arr{transform:translateX(3px);}
.hm-btn-quiet{color:#fff;background:transparent;}
.hm-btn-quiet:hover{background:rgba(255,255,255,.08);}
.hm-btn-outline{
  height:40px;padding:0 16px;border-radius:10px;font-size:13.5px;
  background:var(--surface);border-color:var(--line);color:var(--ink);
}
.hm-btn-outline:hover{border-color:var(--hm-primary);color:var(--hm-primary);}
/* ---------- HERO ---------- */
.hm-hero{
  position:relative;isolation:isolate;overflow:hidden;
  min-height:clamp(600px,46vw,700px);
  display:flex;align-items:center;
  padding:calc(var(--header-h) + 40px) 0 220px;
  background:var(--hm-navy);color:#fff;
}
.hm-hero-media{position:absolute;inset:0;z-index:-1;}
.hm-hero-media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:70% 50%;}
.hm-hero-media::after{
  content:"";position:absolute;inset:0;
  background:
    linear-gradient(90deg, rgba(6,13,42,.92) 0%, rgba(6,13,42,.72) 30%, rgba(6,13,42,.2) 55%, rgba(6,13,42,0) 70%),
    linear-gradient(180deg, rgba(6,13,42,.55) 0%, rgba(6,13,42,0) 22%, rgba(6,13,42,0) 80%, rgba(6,13,42,.4) 100%);
}
.hm-hero-copy{max-width:600px;}
.hm-badge{
  display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border-radius:999px;
  font-size:12px;font-weight:700;letter-spacing:.05em;
  background:rgba(124,108,255,.22);border:1px solid rgba(165,155,255,.35);color:#e0e7ff;
}
.hm-badge .dot{width:7px;height:7px;border-radius:50%;background:#38bdf8;}
.hm-hero h1{
  margin:22px 0 18px;
  font-size:clamp(2.4rem,4.6vw,3.9rem);line-height:1.06;font-weight:800;letter-spacing:-.035em;
}
.hm-hero h1 .grad{
  background:linear-gradient(90deg,#3b82f6 0%,#22d3ee 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;-webkit-text-fill-color:transparent;
}
.hm-lead{font-size:17px;line-height:1.6;color:#c9d3ee;max-width:480px;margin:0;}
.hm-hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:30px;}
@media (prefers-reduced-motion:no-preference){
  .hm-hero-copy > *{animation:hm-rise .8s cubic-bezier(.2,.7,.2,1) both;}
  .hm-hero-copy > :nth-child(2){animation-delay:.07s;}
  .hm-hero-copy > :nth-child(3){animation-delay:.14s;}
  .hm-hero-copy > :nth-child(4){animation-delay:.21s;}
  .hm-hero-copy > :nth-child(5){animation-delay:.28s;}
  @keyframes hm-rise{from{opacity:0;transform:translateY(14px);}to{opacity:1;transform:none;}}
}
@media (max-width:900px){
  .hm-hero{min-height:0;padding-top:calc(var(--header-h) + 40px);padding-bottom:130px;}
  .hm-hero-media img{object-position:78% 50%;}
  .hm-hero-media::after{background:linear-gradient(180deg, rgba(6,13,42,.7) 0%, rgba(6,13,42,.82) 60%, rgba(6,13,42,.94) 100%);}
}
/* Mép dưới hero cong nhẹ, cùng màu nền trang */
.hm-hero::after{
  content:"";position:absolute;left:-10%;right:-10%;bottom:-1px;height:90px;z-index:0;
  background:#f6f8fc;border-radius:50% 50% 0 0 / 100% 100% 0 0;
}
:root[data-theme="dark"] .hm-hero::after{background:var(--paper);}
/* ---------- DẢI CHUYÊN MỤC (đè lên mép dưới hero) ---------- */
.hm-cats{position:relative;z-index:2;margin-top:-150px;}
.hm-cats-track{
  display:grid;grid-auto-flow:column;grid-auto-columns:calc((100% - 2 * 24px) / 3);gap:24px;
  overflow-x:auto;scroll-snap-type:x mandatory;scrollbar-width:none;
  padding:10px 12px 26px;margin:-10px -12px -26px; /* chừa chỗ cho bóng đổ */
  scroll-padding:0 12px;
}
.hm-cats-track::-webkit-scrollbar{display:none;}
.hm-cat-row{
  scroll-snap-align:start;
  display:grid;grid-template-columns:76px minmax(0,1fr) 36px;align-items:center;gap:18px;
  min-height:120px;padding:20px 22px 20px 20px;border-radius:18px;
  text-decoration:none;color:inherit;
  background:linear-gradient(135deg, color-mix(in srgb,var(--c) 6%,var(--surface)) 0%, var(--surface) 70%);
  border:1px solid color-mix(in srgb,var(--c) 10%,var(--line-soft));
  transition:transform .25s ease,border-color .25s ease;
}
:root:not([data-theme="dark"]) .hm-cat-row{background:linear-gradient(135deg, color-mix(in srgb,var(--c) 6%,#fff) 0%, #fff 70%);}
.hm-cat-row:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--c) 35%,var(--line));}
.hm-cat-row-icon{
  width:76px;height:76px;border-radius:16px;display:grid;place-items:center;font-size:30px;
  background:color-mix(in srgb,var(--c) 14%,var(--surface));color:var(--c);
}
.hm-cat-row-text{display:flex;flex-direction:column;gap:4px;min-width:0;}
.hm-cat-row-text b{font-size:17px;font-weight:800;letter-spacing:-.01em;color:var(--ink);line-height:1.3;}
.hm-cat-row-text span{font-size:14px;line-height:1.5;color:var(--ink-3);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.hm-cat-row-go{
  width:36px;height:36px;border-radius:50%;display:grid;place-items:center;font-size:14px;
  background:color-mix(in srgb,var(--c) 14%,var(--surface));color:var(--c);transition:transform .2s,background .2s,color .2s;
}
.hm-cat-row:hover .hm-cat-row-go{background:var(--c);color:#fff;transform:translateX(3px);}
.hm-cats-dots[hidden]{display:none;}
.hm-cats-dots{display:flex;justify-content:center;gap:8px;margin-top:22px;}
.hm-cats-dot{width:22px;height:5px;padding:0;border:0;border-radius:3px;background:color-mix(in srgb,var(--ink-3) 30%,transparent);cursor:pointer;transition:width .2s,background .2s;}
.hm-cats-dot.on{width:30px;background:var(--hm-primary);}
@media (max-width:1024px){ .hm-cats-track{grid-auto-columns:calc((100% - 24px) / 2);} }
@media (max-width:640px){
  .hm-cats{margin-top:-110px;}
  .hm-cats-track{grid-auto-columns:100%;gap:16px;}
  .hm-cat-row{grid-template-columns:60px minmax(0,1fr) 32px;gap:14px;padding:16px;min-height:0;}
  .hm-cat-row-icon{width:60px;height:60px;font-size:24px;border-radius:14px;}
}
/* ---------- SECTIONS ---------- */
.hm-main{padding-bottom:80px;}
.hm-section{padding-top:48px;scroll-margin-top:var(--header-h);}
.hm-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:24px;}
.hm-title{display:flex;align-items:flex-start;gap:14px;}
.hm-icon{
  width:44px;height:44px;flex:none;border-radius:12px;display:grid;place-items:center;font-size:20px;
  background:color-mix(in srgb,var(--hm-primary) 12%,var(--surface));color:var(--hm-primary);
}
.hm-icon.is-flame{background:color-mix(in srgb,#f97316 14%,var(--surface));color:#f97316;}
.hm-head h2,.hm-head .hm-h1{margin:0;font-size:clamp(1.35rem,2.2vw,1.7rem);line-height:1.2;font-weight:800;letter-spacing:-.02em;}
.hm-head p{margin:4px 0 0;font-size:14.5px;color:var(--ink-3);}
.hm-head .hm-btn{flex:none;}
.hm-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;}
@media (max-width:1024px){.hm-grid{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media (max-width:600px){
  .hm-grid{grid-template-columns:1fr;}
  .hm-head{flex-direction:column;}
}
/* Thumbnail chung: nền dự phòng khi bài chưa có ảnh */
.hm-thumb{
  position:relative;overflow:hidden;
  background:
    radial-gradient(90% 90% at 70% 20%, color-mix(in srgb,var(--c,var(--hm-primary)) 42%,transparent), transparent 62%),
    radial-gradient(circle, rgba(148,163,255,.22) 1px, transparent 1.6px) 0 0 / 14px 14px,
    linear-gradient(160deg,#0c1847 0%,#060d2a 100%);
}
.hm-thumb-mark{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-weight:800;font-size:40px;user-select:none;
  color:color-mix(in srgb,var(--c,var(--hm-primary)) 55%,#fff);
  text-shadow:0 0 14px color-mix(in srgb,var(--c,var(--hm-primary)) 85%,transparent);
}
.hm-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s ease;}
/* ---------- BÀI NỔI BẬT ---------- */
.hm-card{
  position:relative;display:flex;flex-direction:column;
  background:var(--surface);border:1px solid var(--line-soft);border-radius:16px;
  overflow:hidden;text-decoration:none;color:inherit;
}
/* Rê chuột: chỉ phóng to ảnh, thẻ đứng yên */
.hm-card:hover .hm-thumb img{transform:scale(1.08);}
.hm-card .hm-thumb{aspect-ratio:40/21;}
.hm-card-body{display:flex;flex-direction:column;flex:1;padding:16px 18px 18px;}
.hm-tag{
  align-self:flex-start;padding:4px 9px;border-radius:999px;
  font-family:var(--mono);font-size:10.5px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;line-height:1;
  background:var(--c);color:#fff;
}
.hm-card h3{margin:12px 0 8px;font-size:17px;line-height:1.3;font-weight:800;letter-spacing:-.01em;color:var(--ink);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.hm-card p{margin:0;font-size:13.5px;line-height:1.55;color:var(--ink-3);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.hm-meta{display:flex;align-items:center;gap:8px;margin-top:auto;padding-top:16px;font-family:var(--mono);font-size:11.5px;color:var(--ink-3);}
.hm-meta .sep{opacity:.6;}
/* ---------- CHUYÊN MỤC ---------- */
.hm-cat{
  position:relative;display:flex;flex-direction:column;min-height:186px;padding:22px;border-radius:16px;
  text-decoration:none;color:inherit;
  background:linear-gradient(160deg, color-mix(in srgb,var(--c) 11%,var(--surface)) 0%, color-mix(in srgb,var(--c) 3%,var(--surface)) 100%);
  border:1px solid color-mix(in srgb,var(--c) 16%,var(--line));
  transition:border-color .25s;
}
.hm-cat:hover{border-color:color-mix(in srgb,var(--c) 45%,var(--line));}
.hm-cat-icon{
  width:54px;height:54px;border-radius:14px;display:grid;place-items:center;font-size:24px;
  background:color-mix(in srgb,var(--c) 16%,var(--surface));color:var(--c);
}
.hm-cat h3{margin:18px 0 6px;font-size:17px;font-weight:800;letter-spacing:-.01em;color:var(--ink);}
.hm-cat p{margin:0;font-size:14px;line-height:1.5;color:var(--ink-3);}
.hm-cat-count{display:inline-flex;align-items:center;gap:8px;margin-top:auto;padding-top:16px;font-size:14.5px;font-weight:700;color:var(--c);}
.hm-cat-count i{font-size:13px;transition:transform .2s;}
.hm-cat:hover .hm-cat-count i{transform:translateX(4px);}
/* ---------- PHỔ BIẾN ---------- */
.hm-popular{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;}
.hm-pop{
  position:relative;display:grid;grid-template-columns:76px 1fr;align-items:center;gap:14px;
  padding:10px;border-radius:14px;
}
.hm-pop:hover .hm-thumb img{transform:scale(1.1);}
.hm-pop .hm-thumb{width:76px;height:76px;border-radius:12px;}
.hm-pop .hm-thumb-mark{font-size:26px;}
.hm-rank{
  position:absolute;top:0;left:0;z-index:2;width:26px;height:26px;border-radius:50%;
  display:grid;place-items:center;font-size:12.5px;font-weight:800;
  background:var(--surface);color:var(--hm-primary);
  border:2px solid color-mix(in srgb,var(--hm-primary) 30%,var(--surface));
}
.hm-pop:first-child .hm-rank{background:var(--hm-primary);color:#fff;border-color:var(--surface);}
.hm-pop h3{margin:0;font-size:14.5px;line-height:1.35;font-weight:700;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.hm-pop h3 a{color:var(--ink);text-decoration:none;}
.hm-pop h3 a::after{content:"";position:absolute;inset:0;}
.hm-pop .hm-meta{padding-top:6px;font-size:11px;flex-wrap:wrap;gap:4px 8px;white-space:nowrap;}
@media (max-width:1024px){.hm-popular{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media (max-width:600px){.hm-popular{grid-template-columns:1fr;}}
/* ---------- NEWSLETTER ---------- */
.hm-news{
  --nl-h:214px; /* chiều cao ảnh nền (ảnh gốc cao 398px) */
  position:relative;isolation:isolate;
  display:grid;grid-template-columns:330px 1fr;align-items:center;gap:24px;
  min-height:var(--nl-h);margin-top:84px;padding:0 40px 0 0;border-radius:22px;color:#fff;
  background:#06164f url('../images/newsletter_background.jpg') left bottom / auto var(--nl-h) no-repeat;
}
/* Ăng-ten robot nhô lên khỏi mép trên banner (khớp vị trí trong ảnh nền) */
.hm-news::after{
  content:"";position:absolute;pointer-events:none;
  left:calc(var(--nl-h) * 221 / 398);bottom:var(--nl-h);
  width:calc(var(--nl-h) * 71 / 398);height:calc(var(--nl-h) * 68 / 398);
  background:url('../images/newsletter_antenna.png') center bottom / 100% 100% no-repeat;
}
/* Cột trái để trống: nhường chỗ cho robot + phong bì trong ảnh nền */
.hm-news-art{align-self:stretch;}
.hm-news-content{padding:34px 0;}
.hm-news-content h2{margin:0;font-size:clamp(1.4rem,2.4vw,1.9rem);line-height:1.2;font-weight:800;letter-spacing:-.02em;}
.hm-news-content > p{margin:8px 0 20px;color:#c7d2fe;font-size:15.5px;}
.hm-news-form{display:flex;gap:12px;max-width:500px;}
.hm-news-field{position:relative;flex:1;}
.hm-news-field i{position:absolute;left:16px;top:50%;transform:translateY(-50%);color:#64748b;pointer-events:none;}
.hm-news-field input{
  width:100%;height:52px;padding:0 16px 0 44px;border-radius:12px;border:2px solid transparent;
  background:#fff;color:#0f172a;font-family:var(--sans);font-size:15px;
}
.hm-news-field input::placeholder{color:#7c879c;}
.hm-news-field input:focus{outline:none;border-color:#60a5fa;}
.hm-news-form .hm-btn{height:52px;padding:0 30px;}
.hm-news-msg{margin:10px 0 0;font-size:13.5px;color:#a7f3d0;}
.hm-news-msg.is-error{color:#fecaca;}
.hm-news-field input[aria-invalid="true"]{border-color:#f87171;}
@media (max-width:860px){
  .hm-news{grid-template-columns:1fr;padding:28px 24px;gap:0;
    background-image:linear-gradient(180deg,rgba(8,20,90,.55),rgba(8,20,90,.8)),url('../images/newsletter_background.jpg');
    background-position:center,20% center;background-size:cover,cover;}
  .hm-news::after{display:none;}
  .hm-news-art{display:none;}
  .hm-news-content{padding:0;}
}
@media (max-width:520px){.hm-news-form{flex-direction:column;}}
.is-home .empty-note{margin-top:48px;}
.hm-btn-outline.is-accent{color:var(--hm-primary);}
/* ---------- TRANG DANH SÁCH (tất cả bài viết / chuyên mục) ---------- */
.is-list,.is-post{background:#f6f8fc;}
:root[data-theme="dark"] .is-list,:root[data-theme="dark"] .is-post{background:var(--paper);}
.hm-page-head{padding-top:44px;}
.hm-crumb{margin:0 0 18px;font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);}
.hm-crumb a{color:var(--ink-3);text-decoration:none;}
.hm-crumb a:hover{color:var(--hm-primary);}
.hm-tabs{display:flex;gap:6px;margin-bottom:22px;}
.hm-tabs a{padding:8px 14px;border-radius:10px;font-size:14px;font-weight:600;text-decoration:none;color:var(--ink-2);border:1px solid var(--line);background:var(--surface);}
.hm-tabs a:hover{color:var(--hm-primary);border-color:var(--hm-primary);}
.hm-tabs a.on{color:#fff;background:var(--hm-primary);border-color:var(--hm-primary);}
.hm-grid + .pager{margin-top:36px;}