/* /classes — class hub page */
.ch-page { background: #fff; }
.ch-wrap { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
.ch-hero { position: relative; overflow: hidden; padding: 48px 0 44px;
  background:
    radial-gradient(circle at 1px 1px, rgba(37, 99, 235, .16) 1.2px, transparent 0) 0 0 / 22px 22px,
    linear-gradient(160deg, #EAF1FF 0%, #FFF7ED 60%, #fff 100%); }
.ch-hero .ch-wrap { position: relative; z-index: 1; }
.ch-blob { position: absolute; border-radius: 50%; filter: blur(60px); z-index: 0; }
.ch-blob-1 { width: 380px; height: 380px; background: #2563EB; opacity: .18; top: -170px; right: -60px; }
.ch-blob-2 { width: 300px; height: 300px; background: #F97316; opacity: .14; bottom: -170px; left: -80px; }
.ch-hero-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 32px; align-items: center; }
.ch-notice { background: #EFF4FF; border: 1px solid #BFDBFE; color: #1E40AF; padding: 12px 16px; border-radius: 12px; margin-bottom: 18px; font-size: 13.5px; }
.ch-eyebrow { display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: #1E40AF; background: #fff; border: 1px solid #BFDBFE; padding: 5px 12px; border-radius: 999px; }
.ch-hero h1 { font-family: 'Poppins', sans-serif; font-size: clamp(28px, 4vw, 44px); line-height: 1.15; color: var(--ink, #0F1E4D); margin: 14px 0 12px; }
.ch-lead { font-size: 17px; line-height: 1.6; color: var(--text, #1E293B); max-width: 580px; }
.ch-stats { list-style: none; padding: 0; margin: 24px 0 0; display: flex; flex-wrap: wrap; gap: 12px; }
.ch-stats li { background: #fff; border: 1px solid var(--border, #E6EBF2); border-radius: 14px; padding: 10px 16px; display: flex; flex-direction: column; min-width: 92px; box-shadow: 0 6px 16px rgba(15, 23, 42, .05); }
.ch-stats strong { font-family: 'Poppins', sans-serif; font-size: 22px; color: var(--ink, #0F1E4D); line-height: 1.1; }
.ch-stats span { font-size: 12.5px; color: var(--muted, #64748B); }
.ch-hero-art svg { width: 100%; max-width: 380px; display: block; margin: 0 auto; filter: drop-shadow(0 18px 24px rgba(15, 23, 42, .12)); }
.ch-float { animation: chFloat 5s ease-in-out infinite; }
.ch-float-2 { animation-delay: -2.5s; }
@keyframes chFloat { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-7px); } }

.ch-stage { padding: 40px 0 8px; }
.ch-stage-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 20px; margin-bottom: 20px; flex-wrap: wrap; }
.ch-range { font-size: 12px; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; color: #F97316; }
.ch-stage-head h2 { font-family: 'Poppins', sans-serif; font-size: clamp(22px, 2.6vw, 28px); color: var(--ink, #0F1E4D); margin: 2px 0 0; }
.ch-stage-head p { max-width: 460px; color: var(--muted, #64748B); font-size: 14.5px; margin: 0; }
.ch-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }

.ch-card { display: flex; flex-direction: column; border-radius: 20px; overflow: hidden; background: #fff; border: 1px solid var(--border, #E6EBF2); text-decoration: none; color: inherit; transition: transform .25s, box-shadow .25s, border-color .25s; }
.ch-card:hover { transform: translateY(-5px); box-shadow: 0 18px 34px color-mix(in srgb, var(--c1) 20%, transparent); border-color: color-mix(in srgb, var(--c1) 40%, #fff); }
.ch-card:focus-visible { outline: 3px solid #93C5FD; outline-offset: 3px; }
.ch-card-top { position: relative; height: 104px; padding: 0 16px 10px 18px; display: flex; align-items: flex-end; justify-content: space-between; background: linear-gradient(135deg, var(--c1), var(--c2)); overflow: hidden; }
.ch-card-top::before { content: ""; position: absolute; width: 140px; height: 140px; border-radius: 50%; background: rgba(255, 255, 255, .16); right: -40px; top: -64px; }
.ch-card-top::after { content: ""; position: absolute; width: 70px; height: 70px; border-radius: 50%; background: rgba(255, 255, 255, .12); left: 46%; bottom: -36px; }
.ch-num { position: relative; z-index: 1; font-family: 'Poppins', sans-serif; font-weight: 800; font-size: 52px; line-height: 1; color: #fff; text-shadow: 0 4px 14px rgba(0, 0, 0, .16); }
.ch-art { position: relative; z-index: 1; width: 48px; height: 48px; transition: transform .35s cubic-bezier(.2, .8, .2, 1); }
.ch-art svg { width: 100%; height: 100%; display: block; }
.ch-card:hover .ch-art { transform: rotate(-8deg) scale(1.1); }
.ch-card-body { display: flex; flex-direction: column; gap: 6px; padding: 14px 18px 18px; flex: 1; }
.ch-card-title { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.ch-card-title h3 { font-family: 'Poppins', sans-serif; font-size: 17px; color: var(--ink, #0F1E4D); margin: 0; }
.ch-board { font-size: 10.5px; font-weight: 800; letter-spacing: .04em; color: var(--c1); background: color-mix(in srgb, var(--c1) 10%, #fff); border-radius: 999px; padding: 2px 8px; }
.ch-tag { margin: 0; font-size: 13px; color: var(--muted, #64748B); }
.ch-meta, .ch-papers { margin: 4px 0 0; font-size: 13px; font-weight: 600; color: var(--text, #1E293B); display: flex; align-items: center; gap: 6px; }
.ch-meta i, .ch-papers i { color: var(--c1); font-size: 15px; }
.ch-meta span { color: var(--muted, #94A3B8); }
.ch-soon { color: var(--muted, #64748B); font-weight: 500; }
.ch-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }
.ch-chips span { font-size: 11.5px; font-weight: 600; color: var(--text, #334155); background: #F1F5F9; border-radius: 8px; padding: 3px 8px; }
.ch-chips .ch-more { background: color-mix(in srgb, var(--c1) 10%, #fff); color: var(--c1); }
.ch-go { margin-top: auto; padding-top: 10px; font-size: 13px; font-weight: 700; color: var(--c1); display: inline-flex; align-items: center; gap: 4px; }
.ch-go i { transition: transform .2s; }
.ch-card:hover .ch-go i { transform: translateX(3px); }

.ch-how { padding: 48px 0 72px; }
.ch-how h2 { font-family: 'Poppins', sans-serif; font-size: clamp(22px, 2.6vw, 28px); color: var(--ink, #0F1E4D); margin: 0 0 18px; }
.ch-steps { list-style: none; padding: 0; margin: 0 0 22px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.ch-steps li { display: flex; gap: 12px; background: var(--bg, #F8FAFC); border: 1px solid var(--border, #E6EBF2); border-radius: 16px; padding: 16px; }
.ch-steps li > span { flex: 0 0 34px; height: 34px; border-radius: 50%; display: grid; place-items: center; background: linear-gradient(135deg, #2563EB, #1E40AF); color: #fff; font-weight: 800; font-family: 'Poppins', sans-serif; }
.ch-steps strong { display: block; color: var(--ink, #0F1E4D); font-size: 15px; }
.ch-steps p { margin: 2px 0 0; font-size: 13.5px; color: var(--muted, #64748B); }
.ch-links { display: flex; flex-wrap: wrap; gap: 10px; }
.ch-links a { display: inline-flex; align-items: center; gap: 6px; padding: 10px 16px; border-radius: 12px; border: 1.5px solid #BFDBFE; color: #1E40AF; font-weight: 700; font-size: 14px; text-decoration: none; background: #fff; transition: border-color .2s, background .2s; }
.ch-links a:hover { border-color: #2563EB; background: #EFF4FF; }

@media (max-width: 1024px) { .ch-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 860px) {
  .ch-hero-grid { grid-template-columns: 1fr; }
  .ch-hero-art { order: -1; }
  .ch-hero-art svg { max-width: 240px; }
  .ch-steps { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .ch-wrap { padding: 0 16px; }
  .ch-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .ch-card-top { height: 78px; padding: 0 10px 8px 12px; }
  .ch-num { font-size: 38px; }
  .ch-art { width: 34px; height: 34px; }
  .ch-card-body { padding: 10px 12px 14px; gap: 4px; }
  .ch-card-title h3 { font-size: 15px; }
  .ch-chips { display: none; }
  .ch-meta, .ch-papers { font-size: 12px; }
  .ch-go { font-size: 12px; }
  .ch-stats { gap: 8px; }
  .ch-stats li { min-width: 0; flex: 1 1 calc(50% - 8px); padding: 8px 12px; }
}
@media (prefers-reduced-motion: reduce) {
  .ch-float { animation: none; }
  .ch-card, .ch-art, .ch-go i { transition: none; }
  .ch-card:hover, .ch-card:hover .ch-art, .ch-card:hover .ch-go i { transform: none; }
}