/* =========================================================
   Sections · 03 Our kits & subjects, 04 Programs (solution cards, for schools + online learning).
   ========================================================= */

/* ---------- 03 Two columns: kits | subjects ---------- */
.kits__cols { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); gap: 40px; align-items: start; }
@media (max-width: 1100px) { .kits__cols { grid-template-columns: minmax(0, 1fr); } }
.stack__title { margin: 0 0 16px; font: 500 12px var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }

/* ---------- Our kits & technology platforms ---------- */
/* hairlines are drawn per cell, so a part-filled last row stays clean whatever the kit count */
.stack__grid {
  display: grid; grid-template-columns: repeat(5, minmax(0, 1fr));
  margin: 0; padding: 0; list-style: none;
  background: var(--surface); border: 1px solid var(--edge); border-radius: 20px; overflow: hidden;
}
.stack__grid li { display: flex; flex-direction: column; gap: 4px; padding: 18px 16px; background: var(--surface); box-shadow: 1px 0 0 var(--edge), 0 1px 0 var(--edge); transition: background-color .25s; }
.stack__grid li::before {   /* a little pin header */
  content: ""; width: 34px; height: 6px; margin-bottom: 12px;
  background: radial-gradient(circle, var(--steel) 2.2px, transparent 2.6px) 0 50% / 7px 6px repeat-x;
}
.stack__grid li:hover { background: #FAFBFD; }
.stack__grid li:hover::before { background-image: radial-gradient(circle, var(--accent) 2.2px, transparent 2.6px); }
.stack__grid b { font-size: 18px; font-weight: 600; letter-spacing: -.02em; }
/* Yentrika's own learning platforms: orange pin header */
.stack__grid li.is-platform::before { background-image: radial-gradient(circle, var(--accent) 2.2px, transparent 2.6px); }
.stack__grid li.is-platform b { color: var(--ink); }
@media (max-width: 860px) { .stack__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* ---------- Subjects covered: orange · orange→blue · blue tiles ---------- */
.subjects__grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin: 0; padding: 0; list-style: none; }
.subjects__grid li {
  display: grid; place-items: center; min-height: 64px; padding: 12px 10px;
  border-radius: 14px; background: var(--blue); color: #fff;
  font-size: 17px; font-weight: 700; letter-spacing: -.01em; text-align: center;
}
.subjects__grid li.is-orange { background: var(--accent); }
.subjects__grid li.is-blend { background: linear-gradient(90deg, var(--accent) 15%, var(--blue)); }
@media (max-width: 520px) { .subjects__grid li { min-height: 56px; font-size: 14px; } }

/* ---------- 04 Programs: tabs ---------- */
.tabs__list {
  display: inline-flex; gap: 4px; padding: 5px; margin-bottom: clamp(28px, 3.5vw, 40px);
  border: 1px solid var(--edge); border-radius: 999px; background: var(--surface);
}
.tabs__list[hidden] { display: none; }
.tabs__list button {
  padding: 12px 22px; border: 0; border-radius: 999px; cursor: pointer;
  background: transparent; color: var(--text); font: 600 15px var(--sans);
  transition: background-color .2s, color .2s;
}
.tabs__list button span { font-weight: 500; color: var(--muted); }
.tabs__list button:hover { color: var(--ink); }
.tabs__list button[aria-selected="true"] { background: var(--ink); color: var(--accent-light); }
.tabs__list button[aria-selected="true"] span { color: inherit; opacity: .8; }
.tabs__list button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.prog[hidden] { display: none; }
.prog:not([hidden]) { animation: tab-in .35s ease-out; }
@keyframes tab-in { from { opacity: 0; transform: translateY(6px); } }
@media (max-width: 560px) {
  .tabs__list { display: flex; }
  .tabs__list button { flex: 1; padding: 11px 12px; font-size: 14px; }
  .tabs__list button span { display: none; }
}

/* ---------- 04 Programs: for schools, then for students (online) ---------- */
.prog__head { display: grid; gap: 10px; max-width: 780px; margin-bottom: clamp(24px, 3vw, 32px); }
.prog__head .chip { justify-self: start; }
.prog__title { font-size: clamp(28px, 3vw, 40px); letter-spacing: -.035em; line-height: 1.08; }
.prog__lead { max-width: 36em; font-size: 18px; color: var(--text); }

/* for students: heading on the left, the online card on the right */
.prog--split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 32px clamp(32px, 5vw, 72px); align-items: center; }
.prog--split .prog__head { margin-bottom: 0; }
.prog--split .sol { grid-template-columns: minmax(0, 1fr); }   /* the online card(s) stack beside the heading */
@media (max-width: 960px) { .prog--split { grid-template-columns: minmax(0, 1fr); } }

/* ---------- Solution cards (four for schools, one for students) ---------- */
.sol { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.sol__tag { margin-top: -6px; font: 500 11.5px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink); }
/* specifics + actions sit at the bottom, so they line up across a row */
.sol__foot {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding-top: 6px;
}
.sol__link { font: 500 13px var(--mono); color: var(--muted); text-decoration: none; transition: color .2s; }
.sol__link:hover { color: var(--ink); }
.sol__cta {
  margin-left: auto;   /* stays right even when a card has no extra link */
  flex: none; display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px; border-radius: 999px;
  background: var(--ink); color: var(--accent-light);
  font: 600 14px/1 var(--sans); text-decoration: none;
  transition: background-color .2s, color .2s, transform .45s var(--servo);
}
.sol__cta span { display: inline-block; transition: transform .45s var(--servo); }
.sol__cta:hover { background: var(--ink-deep); transform: translateY(-1px); }
.sol__cta:hover span { transform: translateX(3px); }
.sol__cta:focus-visible, .sol__link:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
@media (max-width: 640px) { .sol { grid-template-columns: minmax(0, 1fr); } }