/* ==========================================================================
   NanoMatma: strona bloga z podziałem na etap i dział (page-blog.php)
   ========================================================================== */

.blog-index { background: var(--paper); color: var(--ink); }

/* --- Nagłówek ------------------------------------------------------------ */

.blog-index__hero {
  position: relative;
  padding: 150px 0 clamp(56px, 7vw, 90px);
  background: var(--navy);
  color: var(--paper);
  isolation: isolate;
  overflow: hidden;
}

.blog-index__hero::before {
  content: "";
  position: absolute;
  z-index: -2;
  inset: 0 0 0 auto;
  width: 44%;
  background: var(--blue);
  border-bottom-left-radius: 46% 32%;
}

.blog-index__hero-inner { position: relative; max-width: 880px; }

.blog-index__hero h1 {
  margin: 0;
  max-width: 15ch;
  font-family: var(--font-display);
  font-size: clamp(40px, 5.6vw, 76px);
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: 1.03;
}

.blog-index__lead {
  max-width: 58ch;
  margin: 26px 0 0;
  color: rgba(251, 248, 241, .76);
  font-size: 18px;
  line-height: 1.68;
}

/* --- Macierz: wiersze to etapy, kolumny to działy ------------------------- */

.blog-matrix-section { padding: clamp(50px, 6vw, 86px) 0 clamp(60px, 7vw, 100px); }

.blog-matrix {
  display: grid;
  grid-template-columns: minmax(180px, .72fr) repeat(2, minmax(0, 1.4fr));
  gap: 14px;
  align-items: stretch;
}

/* Róg tabelki: tłumaczy, co jest w którą stronę. */
.blog-matrix__corner {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  align-items: center;
  gap: 4px 10px;
  padding: 18px 20px;
  color: rgba(16, 47, 73, .5);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.blog-matrix__corner > span:first-child { grid-row: 2; align-self: end; }
.blog-matrix__corner-branch { grid-column: 2; grid-row: 1; justify-self: start; }

.blog-matrix__arrows {
  grid-column: 1;
  grid-row: 1;
  width: 26px;
  height: 26px;
  justify-self: center;
}

.blog-matrix__arrows path {
  fill: none;
  stroke: var(--red);
  stroke-width: 2.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Nagłówek kolumny: dział matematyki. */
.blog-matrix__col {
  display: grid;
  gap: 4px;
  align-content: end;
  padding: 18px 22px;
  border-bottom: 3px solid var(--navy);
}

.blog-matrix__col strong {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.2vw, 27px);
  font-weight: 800;
  letter-spacing: -.02em;
}

.blog-matrix__col span {
  color: rgba(16, 47, 73, .55);
  font-size: 12.5px;
  line-height: 1.45;
}

/* Pasek grupujący: nazwa etapu nad jego poziomami. Rozciąga się na całą
   szerokość macierzy, żeby było widać, że kolejne wiersze należą do niego. */
.blog-matrix__band {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  margin-top: 18px;
  padding: 0 4px 12px;
  border-bottom: 3px solid var(--navy);
  scroll-margin-top: 110px;
}

.blog-matrix__band h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 800;
  letter-spacing: -.028em;
  line-height: 1.1;
}

.blog-matrix__band p {
  margin: 0;
  color: rgba(16, 47, 73, .55);
  font-size: 13.5px;
}

/* Etykieta wiersza: etap nauki. */
.blog-matrix__row {
  display: grid;
  align-content: center;
  gap: 8px;
  padding: 26px 24px;
  background: var(--navy);
  color: var(--paper);
  border-radius: 14px;
  scroll-margin-top: 110px;
}

.blog-matrix__row h2,
.blog-matrix__row h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.3vw, 29px);
  font-weight: 800;
  letter-spacing: -.025em;
  line-height: 1.12;
}

/* Poziom wewnątrz etapu jest podrzędny, więc kafelek jest jaśniejszy
   i węższy niż etap bez poziomów. */
.blog-matrix__row--level {
  background: var(--blue);
  padding: 22px 24px;
}

.blog-matrix__row--level h3 { font-size: clamp(19px, 2vw, 25px); }

.blog-matrix__row > p {
  margin: 0;
  color: rgba(251, 248, 241, .68);
  font-size: 13.5px;
  line-height: 1.55;
}

.blog-matrix__count {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-top: 6px !important;
  padding-top: 12px;
  border-top: 1px solid rgba(251, 248, 241, .2);
  color: rgba(251, 248, 241, .6) !important;
  font-size: 12px !important;
  font-weight: 700;
}

.blog-matrix__count b {
  color: var(--mint);
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
}

/* Komórka: przecięcie etapu i działu. */
.blog-cell {
  display: grid;
  align-content: start;
  gap: 12px;
  padding: 20px;
  background: #fff;
  border: 1px solid rgba(16, 47, 73, .12);
  border-radius: 14px;
  scroll-margin-top: 110px;
}

.blog-cell__tag {
  margin: 0;
  color: rgba(16, 47, 73, .42);
  font-size: 10.5px;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.blog-cell--empty {
  align-content: center;
  justify-items: start;
  background: transparent;
  border-style: dashed;
  border-color: rgba(16, 47, 73, .24);
}

.blog-cell__empty {
  margin: 0;
  color: rgba(16, 47, 73, .5);
  font-size: 15px;
  font-weight: 650;
}

.blog-cell__ask {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--red);
  font-size: 13px;
  font-weight: 800;
}

.blog-cell__ask i { font-style: normal; font-size: 15px; }

/* --- Kafelek artykułu ----------------------------------------------------- */

.blog-cards { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }

.blog-card {
  display: grid;
  gap: 9px;
  height: 100%;
  padding: 18px 20px 17px;
  background: var(--paper);
  border-left: 3px solid var(--blue);
  border-radius: 0 10px 10px 0;
}

.blog-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.blog-card__tag {
  color: var(--blue);
  font-size: 10.5px;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.blog-card__time { color: rgba(16, 47, 73, .45); font-size: 12px; font-weight: 700; }

.blog-card__title {
  font-family: var(--font-display);
  font-size: clamp(19px, 1.9vw, 24px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.22;
}

.blog-card__excerpt {
  color: rgba(16, 47, 73, .7);
  font-size: 14px;
  line-height: 1.62;
}

.blog-card__more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
  color: var(--red);
  font-size: 13px;
  font-weight: 800;
}

.blog-card__more i { font-style: normal; font-size: 15px; }

/* --- CTA ------------------------------------------------------------------ */

.blog-index__cta {
  padding: clamp(54px, 7vw, 88px) 0;
  background: var(--navy);
  color: var(--paper);
}

.blog-index__cta-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: clamp(28px, 4vw, 56px);
  align-items: center;
}

.blog-index__cta h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.2vw, 42px);
  font-weight: 800;
  letter-spacing: -.025em;
  line-height: 1.1;
}

.blog-index__cta p {
  max-width: 56ch;
  margin: 0;
  color: rgba(251, 248, 241, .74);
  font-size: 16px;
  line-height: 1.68;
}

/* --- Interakcje i responsywność ------------------------------------------- */

@media (hover: hover) and (prefers-reduced-motion: no-preference) {
  .blog-card { transition: transform .3s cubic-bezier(.2, .8, .2, 1), background .3s ease, border-left-color .3s ease; }
  .blog-card:hover { transform: translateX(5px); background: var(--cream); border-left-color: var(--red); }
  .blog-cell--empty { transition: border-color .25s ease, background .25s ease; }
  .blog-cell--empty:hover { border-color: var(--red); background: rgba(239, 52, 35, .03); }
  .blog-card:hover .blog-card__more i { transform: translateX(4px); }
  .blog-card__more i { transition: transform .25s ease; }
  .blog-index .button span { transition: transform .25s ease; }
  .blog-index .button:hover span { transform: rotate(45deg); }
}

/* Poniżej tej szerokości tabelka przestaje się mieścić, więc rozkładamy ją
   na listę: etap, pod nim jego dwa działy. */
@media (max-width: 900px) {
  .blog-matrix { grid-template-columns: 1fr; gap: 10px; }
  .blog-matrix__corner, .blog-matrix__col { display: none; }
  .blog-matrix__row { margin-top: 22px; }
  .blog-matrix__row:first-of-type { margin-top: 0; }
  .blog-cell { min-height: 0; }
  .blog-cell__tag { color: rgba(16, 47, 73, .6); }
  .blog-cell--empty { padding: 22px 20px; }
  .blog-index__cta-inner { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .blog-index__hero { padding: 120px 0 56px; }
  .blog-index__hero::before { inset: auto 0 0 0; width: 100%; height: 34%; border-radius: 40% 40% 0 0 / 14% 14% 0 0; }
  .blog-index .button { width: 100%; }
}