/* ============================================================
   catalog.css — Hero + Toolbar + Grid + Card (port từ index.html).
   Chỉ nạp ở front-page / archive khóa học / trang tìm kiếm.
   ============================================================ */

/* ---------- Hero ---------- */
.hero{position:relative;padding:70px 0 56px;overflow:hidden}
.hero .glow{position:absolute;top:-160px;right:-120px;width:560px;height:560px;border-radius:50%;background:radial-gradient(circle,rgba(15,80,26,.20),transparent 62%);filter:blur(20px);z-index:0}
.hero .glow2{position:absolute;bottom:-220px;left:-160px;width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(212,175,55,.16),transparent 64%);filter:blur(20px);z-index:0}
.hero-inner{position:relative;z-index:1;max-width:720px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;background:var(--surface);border:1px solid var(--line);padding:6px 14px 6px 8px;border-radius:30px;font-size:13px;font-weight:600;color:var(--ink-2);box-shadow:var(--shadow-sm);margin-bottom:24px}
.eyebrow .dot{width:8px;height:8px;border-radius:50%;background:var(--green);box-shadow:0 0 0 4px var(--green-soft)}
.hero h1{font-family:var(--font-display);font-weight:800;font-size:clamp(38px,6vw,62px);line-height:1.02;letter-spacing:-1.8px;margin-bottom:20px}
.hero h1 .hl{position:relative;color:var(--brand);white-space:nowrap}
.hero h1 .hl::after{content:"";position:absolute;left:-2px;right:-2px;bottom:6px;height:14px;z-index:-1;border-radius:4px;background:linear-gradient(90deg,rgba(15,80,26,.22),rgba(212,175,55,.22))}
.hero p.lead{font-size:18px;color:var(--ink-2);max-width:600px;margin-bottom:26px}
.hero--archive{padding:50px 0 8px}
.hero--archive h1{font-size:clamp(30px,5vw,46px);letter-spacing:-1px;margin-bottom:10px}

.tags{display:flex;flex-wrap:wrap;gap:9px;margin-bottom:38px}
.tags .lbl{font-size:13.5px;color:var(--ink-3);align-self:center;margin-right:2px}
.tag{font-size:13.5px;font-weight:500;background:var(--surface);border:1px solid var(--line-2);padding:7px 14px;border-radius:30px;color:var(--ink-2);transition:.18s}
.tag:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-1px)}

.stats{display:flex;flex-wrap:wrap;gap:36px}
.stat .num{font-family:var(--font-display);font-weight:800;font-size:32px;letter-spacing:-.8px;line-height:1}
.stat .num span{color:var(--brand)}
.stat .cap{font-size:13.5px;color:var(--ink-3);margin-top:4px}

/* ---------- Toolbar ---------- */
.catalog{padding-bottom:20px}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin:8px 0 22px;flex-wrap:wrap}
.section-head .tt{font-family:var(--font-display);font-weight:800;font-size:30px;letter-spacing:-.8px}
.section-head .desc{font-size:14.5px;color:var(--ink-3);margin-top:3px}
.result-count{font-size:14px;color:var(--ink-2);font-weight:500}
.result-count b{color:var(--ink);font-weight:700}

.toolbar{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:30px;flex-wrap:wrap}
.chips{display:flex;gap:9px;overflow-x:auto;padding-bottom:4px;scrollbar-width:none}
.chips::-webkit-scrollbar{display:none}
.chip{flex-shrink:0;font-size:14px;font-weight:600;padding:9px 16px;border-radius:11px;color:var(--ink-2);border:1.5px solid var(--line-2);background:var(--surface);transition:.18s;white-space:nowrap}
.chip:hover{border-color:var(--ink-3);color:var(--ink)}
.chip.active{background:var(--ink);color:#fff;border-color:var(--ink)}

.sort{display:flex;align-items:center;gap:4px;background:var(--bg-2);border:1px solid var(--line);border-radius:13px;padding:4px}
.sort .sb{font-size:13.5px;font-weight:600;color:var(--ink-2);padding:7px 13px;border-radius:9px;transition:.15s}
.sort .sb:hover{color:var(--ink)}
.sort .sb.active{background:var(--surface);color:var(--ink);box-shadow:var(--shadow-sm)}

/* ---------- Grid + Cards ---------- */
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;padding-bottom:20px}
.grid.loading{opacity:.5;pointer-events:none;transition:opacity .2s}

.card{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;transition:transform .3s cubic-bezier(.2,.7,.2,1),box-shadow .3s,border-color .3s;opacity:0;transform:translateY(16px);animation:rise .55s cubic-bezier(.2,.7,.2,1) forwards}
@keyframes rise{to{opacity:1;transform:none}}
.card:hover{transform:translateY(-7px);box-shadow:var(--shadow-lg);border-color:var(--line-2)}
.card-link{position:absolute;inset:0;z-index:1;border-radius:inherit}
.card .add{position:relative;z-index:2}

.cover{position:relative;aspect-ratio:16/10;overflow:hidden;color:#fff}
.cover .bg{position:absolute;inset:0;transition:transform .5s cubic-bezier(.2,.7,.2,1)}
.card:hover .cover .bg{transform:scale(1.06)}
.cover .bg::after{content:"";position:absolute;inset:0;background:radial-gradient(120% 90% at 80% 0%,rgba(255,255,255,.28),transparent 55%)}
.cover .grain{position:absolute;inset:0;opacity:.14;mix-blend-mode:overlay;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}
.cover .ico{position:absolute;right:-14px;bottom:-18px;opacity:.18}
.cover .ico svg{width:140px;height:140px}
.cover .kw{position:absolute;left:18px;top:50%;transform:translateY(-58%);right:14px;font-family:var(--font-display);font-weight:800;font-size:26px;line-height:1.05;letter-spacing:-.6px;text-shadow:0 3px 14px rgba(0,0,0,.22)}
.cover .cover-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s cubic-bezier(.2,.7,.2,1)}
.card:hover .cover .cover-img{transform:scale(1.06)}
.cover.has-img .ico,.cover.has-img .kw{display:none}
.badge-off{position:absolute;top:13px;left:13px;background:#fff;color:var(--brand-deep);font-weight:800;font-size:13px;padding:5px 10px;border-radius:9px;box-shadow:0 6px 14px -6px rgba(0,0,0,.4);letter-spacing:-.2px}
.ribbon{position:absolute;top:13px;right:13px;background:rgba(0,0,0,.42);backdrop-filter:blur(4px);color:#fff;font-size:11.5px;font-weight:700;padding:5px 10px;border-radius:30px;display:flex;align-items:center;gap:5px;letter-spacing:.2px}
.chip-cat{position:absolute;left:13px;bottom:13px;background:rgba(255,255,255,.92);color:var(--ink);font-size:11.5px;font-weight:700;padding:4px 11px;border-radius:30px;letter-spacing:.1px}

.body{padding:18px;display:flex;flex-direction:column;flex:1;gap:11px}
.level{font-size:12px;font-weight:600;color:var(--ink-3);letter-spacing:.3px;text-transform:uppercase}
.card-cat{display:none;font-size:11px;font-weight:700;letter-spacing:.4px;text-transform:uppercase;color:var(--brand-deep)}
.title{font-family:var(--font-display);font-weight:700;font-size:18px;letter-spacing:-.4px;line-height:1.25;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:46px;transition:color .2s}
.card:hover .title{color:var(--brand-deep)}

.author{display:flex;align-items:center;gap:9px}
.avatar{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;color:#fff;font-size:12px;font-weight:700;flex-shrink:0}
.author .meta{line-height:1.2}
.author .nm{font-size:13.5px;font-weight:600;color:var(--ink)}
.author .ro{font-size:11.5px;color:var(--ink-3)}

.course-meta{display:flex;gap:14px;font-size:12.5px;color:var(--ink-2);align-items:center}

.rating{display:flex;align-items:center;gap:8px}
.stars{position:relative;display:inline-block;font-size:15px;line-height:1;letter-spacing:1px;font-family:Arial,sans-serif}
.stars .base{color:#E4DACB}
.stars .fill{position:absolute;top:0;left:0;white-space:nowrap;overflow:hidden;color:var(--gold)}
.rating .rv{font-size:13px;font-weight:700;color:var(--ink)}
.rating .rc{font-size:12.5px;color:var(--ink-3)}

.card-foot{margin-top:auto;padding-top:14px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:10px}
.price .now{font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:-.5px;color:var(--ink)}
.price .was{font-size:12.5px;color:var(--ink-3);text-decoration:line-through;margin-top:1px}
.free-pill{background:var(--green-soft);color:var(--green);font-weight:800;font-size:13px;padding:5px 12px;border-radius:9px;font-family:var(--font-display);letter-spacing:-.2px}
.add{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;flex-shrink:0;background:var(--bg-2);color:var(--ink);transition:.2s;border:1px solid var(--line)}
.add svg{width:19px;height:19px;transition:.2s}
.add:hover{background:var(--brand);color:#fff;border-color:var(--brand);transform:translateY(-2px)}
.add.added{background:var(--green);color:#fff;border-color:var(--green)}

.empty{grid-column:1/-1;text-align:center;padding:70px 20px;color:var(--ink-3)}
.empty .em{font-size:46px;margin-bottom:12px}
.empty h3{font-family:var(--font-display);color:var(--ink);font-size:22px;margin-bottom:6px}

/* ---------- Responsive ---------- */
@media(max-width:1100px){.grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:860px){.grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){
  .grid{grid-template-columns:1fr;gap:14px}
  .stats{display:grid;grid-template-columns:1fr 1fr;gap:20px 14px}
  .stat .num{font-size:26px}
  .hero{padding:48px 0 40px}
  .sort{max-width:100%;overflow-x:auto;justify-content:flex-start;scrollbar-width:none;-webkit-overflow-scrolling:touch}
  .sort::-webkit-scrollbar{display:none}
  .sort .sb{flex-shrink:0;white-space:nowrap}
  .card{flex-direction:row;border-radius:var(--radius-sm)}
  .cover{width:120px;aspect-ratio:auto;align-self:stretch;flex-shrink:0;min-height:120px}
  .cover .kw{font-size:13.5px;left:11px;right:11px;transform:translateY(-50%)}
  .cover .ico,.cover .ribbon,.cover .chip-cat{display:none}
  .badge-off{top:8px;left:8px;font-size:11px;padding:3px 7px}
  .body{padding:12px 14px;gap:5px;justify-content:center}
  .level,.author{display:none}
  .card-cat{display:block}
  .title{font-size:15px;min-height:0;margin:0}
  .card-foot{margin-top:6px;padding-top:0;border-top:none}
  .price .now{font-size:17px}
  .add{width:38px;height:38px}
}

/* ---------- Tải thêm (phân trang catalog) ---------- */
.loadmore-wrap{display:flex;justify-content:center;margin-top:32px}
.loadmore-wrap[hidden]{display:none}
.loadmore{appearance:none;cursor:pointer;font-family:inherit;font-weight:600;font-size:15px;color:var(--ink-2);background:var(--surface);border:1px solid var(--line);border-radius:30px;padding:13px 30px;box-shadow:var(--shadow-sm);display:inline-flex;align-items:center;gap:9px;transition:transform .12s ease,box-shadow .12s ease,border-color .12s ease}
.loadmore svg{width:17px;height:17px;transform:rotate(90deg);transition:transform .2s ease}
.loadmore:hover{transform:translateY(-1px);border-color:var(--brand);color:var(--brand)}
.loadmore:hover svg{transform:rotate(90deg) translateX(3px)}
.loadmore.is-loading{opacity:.6;pointer-events:none}