/* ============================================
   platform.css — Familiar layout, distinctive details
============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Sora:wght@600;700;800&display=swap');

:root {
  /* Coursera blue + Udemy purple */
  --c-blue: #0056d2;
  --c-blue-dark: #003a8c;
  --c-blue-soft: #e3f2fd;
  --u-purple: #a435f0;
  --u-purple-dark: #6d28d9;
  --ink: #1c1d1f;
  --ink-soft: #4a4c4f;
  --line: #e6e6e8;
  --line-soft: #f0f1f3;
  --paper: #ffffff;
  --bg-soft: #f7f9fa;
  --gold: #b4690e;
  --gold-bg: #fff8e1;
  --success: #16804a;
  --rose: #d1234c;
  --rose-bg: #ffeef0;

  --font-display: 'Sora', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;
}

/* ===== Reset + base ===== */
body {
  font-family: var(--font-body) !important;
  color: var(--ink) !important;
  background: var(--paper) !important;
  font-size: 16px;
  line-height: 1.5;
}
h1, h2, h3, h4, h5 {
  font-family: var(--font-display) !important;
  letter-spacing: -0.02em;
  color: var(--ink);
  font-weight: 700;
}

/* ===== Container ===== */
.px-wrap {
  max-width: 1380px;
  margin: 0 auto;
  padding: 0 24px;
}
@media (max-width: 600px) { .px-wrap { padding: 0 18px; } }

/* ===== Header / navigation ===== */
.px-nav {
  background: #fff;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 100;
}
.px-nav-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 72px;
  max-width: 1380px;
  margin: 0 auto;
  padding: 0 24px;
}
.px-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}
.px-logo-mark {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--c-blue), var(--u-purple));
  display: grid; place-items: center;
  color: #fff;
  font-size: 17px;
  font-weight: 800;
}
.px-cats-wrap {
  position: relative;
  flex-shrink: 0;
}
.px-cats-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 14px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  font-family: inherit;
  color: var(--ink);
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.15s;
}
.px-cats-btn:hover, .px-cats-btn.open { background: var(--bg-soft); border-color: var(--ink); }
.px-cats-btn.open .fa-chevron-down { transform: rotate(180deg); }
.px-cats-btn .fa-chevron-down { transition: transform 0.18s; }

/* Categories mega-dropdown */
.px-cats-dropdown {
  position: absolute;
  top: calc(100% + 10px); left: 0;
  width: 580px;
  max-width: 92vw;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 24px 48px rgba(0,0,0,0.14);
  padding: 18px;
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all 0.18s ease;
}
.px-cats-dropdown.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.px-cats-dropdown-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 6px 14px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 12px;
}
.px-cats-dropdown-head span {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.px-cats-dropdown-head .px-link {
  color: var(--c-blue);
  font-weight: 700;
  font-size: 13px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.px-cats-dropdown-head .px-link:hover { text-decoration: underline; }

.px-cats-dropdown-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
}
.px-cats-dropdown a.cat-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--ink);
  text-decoration: none;
  transition: background 0.15s;
}
.px-cats-dropdown a.cat-item:hover { background: var(--bg-soft); }
.px-cats-dropdown a.cat-item .ic {
  width: 36px; height: 36px;
  border-radius: 50%;
  display: grid; place-items: center;
  color: #fff;
  font-size: 14px;
  flex-shrink: 0;
}
.px-cats-dropdown a.cat-item .info { flex: 1; min-width: 0; }
.px-cats-dropdown a.cat-item .nm {
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
}
.px-cats-dropdown a.cat-item .ct {
  font-size: 12px;
  color: var(--ink-soft);
  margin-top: 1px;
}
.px-cats-dropdown a.cat-item .arr {
  color: var(--ink-soft);
  font-size: 11px;
  opacity: 0;
  transition: all 0.15s;
}
.px-cats-dropdown a.cat-item:hover .arr { opacity: 1; transform: translateX(2px); color: var(--c-blue); }

/* Backdrop overlay */
.px-cats-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.04);
  z-index: 150;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s;
}
.px-cats-backdrop.open { opacity: 1; visibility: visible; }

@media (max-width: 700px) {
  .px-cats-dropdown { width: 90vw; left: 50%; transform: translateX(-50%) translateY(-8px); }
  .px-cats-dropdown.open { transform: translateX(-50%) translateY(0); }
  .px-cats-dropdown-grid { grid-template-columns: 1fr; }
}
.px-search {
  flex: 0 0 auto !important;          /* don't grow, don't shrink — pure fixed width */
  width: 360px !important;
  min-width: 0 !important;
  max-width: 360px !important;
  margin-right: 0 !important;
  position: relative;
}
.px-search input { min-width: 0; text-overflow: ellipsis; }
@media (min-width: 1500px) {
  .px-search { width: 420px !important; max-width: 420px !important; }
}
.px-search input {
  width: 100%;
  height: 44px;
  padding: 0 18px 0 46px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-soft);
  font-size: 14.5px;
  font-family: inherit;
  transition: all 0.15s;
}
.px-search input:focus {
  outline: none;
  border-color: var(--ink);
  background: #fff;
  box-shadow: 0 0 0 1px var(--ink);
}
.px-search i {
  position: absolute;
  left: 18px; top: 50%;
  transform: translateY(-50%);
  color: var(--ink-soft);
  font-size: 14px;
}
.px-nav-links {
  display: flex !important;
  align-items: center !important;
  gap: 22px !important;                  /* tight between menu items */
  flex-shrink: 0;
  margin-left: auto !important;          /* pushes the cluster right, towards CTA buttons */
  margin-right: 8px !important;          /* small gap before the buttons */
}
.px-nav-links a {
  letter-spacing: 0.01em;
  white-space: nowrap;
}
@media (min-width: 1500px) {
  .px-nav-links { gap: 28px !important; }
}
.px-nav-links a {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
  position: relative;
}
.px-nav-links a:hover { color: var(--c-blue); }
.px-nav-cta {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}
.px-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 42px;
  padding: 0 20px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 700;
  font-family: inherit;
  text-decoration: none;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all 0.18s ease;
  white-space: nowrap;
  letter-spacing: -0.005em;
}
.px-btn-outline {
  background: #fff;
  color: var(--ink);
  border-color: var(--ink);
}
.px-btn-outline:hover { background: var(--ink); color: #fff; transform: translateY(-2px); }
.px-btn-solid {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
  box-shadow: 0 2px 0 var(--c-blue);  /* signature offset shadow */
}
.px-btn-solid:hover {
  background: var(--c-blue);
  border-color: var(--c-blue);
  transform: translateY(-2px);
  box-shadow: 0 4px 0 var(--c-blue-dark);
}
.px-btn-blue {
  background: var(--c-blue);
  color: #fff;
  border-color: var(--c-blue);
  box-shadow: 0 2px 0 var(--c-blue-dark);
}
.px-btn-blue:hover {
  background: var(--c-blue-dark);
  border-color: var(--c-blue-dark);
  transform: translateY(-2px);
}
.px-btn-lg { height: 50px; padding: 0 26px; font-size: 15px; border-radius: 12px; }
.px-btn-sm { height: 34px; padding: 0 14px; font-size: 13px; border-radius: 8px; }

@media (max-width: 1200px) { .px-nav-links { display: none; } }
@media (max-width: 900px) { .px-cats-btn span { display: none; } }
@media (max-width: 600px) {
  .px-search { display: none; }
  .px-cats-btn { display: none; }
}

/* ===== Hero (with integrated stats row — distinct from Coursera/Udemy flat heros) ===== */
.px-hero {
  padding: 48px 0 0;
  background: var(--paper);
}
.px-hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.px-hero-stats {
  margin-top: 44px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.px-hero-stats .px-stat {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 8px;
  border-right: 1px solid var(--line);
}
.px-hero-stats .px-stat:last-child { border-right: none; }
.px-hero-stats .px-stat .pic {
  width: 38px; height: 38px;
  border-radius: 10px;
  display: grid; place-items: center;
  color: #fff;
  font-size: 14px;
  flex-shrink: 0;
}
.px-hero-stats .px-stat .pic.b { background: var(--c-blue); }
.px-hero-stats .px-stat .pic.p { background: var(--u-purple); }
.px-hero-stats .px-stat .pic.g { background: var(--success); }
.px-hero-stats .px-stat .pic.o { background: #ea580c; }
.px-hero-stats .px-stat .v {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
}
.px-hero-stats .px-stat .l {
  font-size: 12.5px;
  color: var(--ink-soft);
  margin-top: 3px;
}
@media (max-width: 900px) {
  .px-hero-stats { grid-template-columns: repeat(2, 1fr); }
  .px-hero-stats .px-stat:nth-child(2) { border-right: none; }
}
.px-hero-text h1 {
  font-size: clamp(2.2rem, 4.4vw, 3.6rem);
  line-height: 1.1;
  margin: 0 0 18px;
  font-weight: 800;
}
.px-hero-text h1 em {
  font-style: italic;
  color: var(--c-blue);
  font-weight: 600;
  font-family: var(--font-italic);
  position: relative;
  display: inline-block;
}
.px-hero-text h1 em::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  bottom: 4px;
  height: 12px;
  background: var(--c-blue-soft);
  z-index: -1;
  border-radius: 4px;
}
.px-hero-text .px-lead {
  font-size: 17.5px;
  color: var(--ink-soft);
  line-height: 1.5;
  margin-bottom: 28px;
  max-width: 520px;
}
.px-hero-text .px-cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.px-trust-line {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.px-trust-line .stars { color: #f59e0b; font-size: 16px; letter-spacing: 2px; }
.px-trust-line .rating { font-weight: 700; }
.px-trust-line .meta { color: var(--ink-soft); font-size: 14px; }
.px-trust-line .ava-row { display: inline-flex; margin-right: 6px; }
.px-trust-line .ava-row .av {
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 2px solid #fff;
  margin-left: -10px;
  display: grid; place-items: center;
  color: #fff;
  font-weight: 700;
  font-size: 11px;
  background: linear-gradient(135deg, var(--c-blue), var(--u-purple));
}
.px-trust-line .ava-row .av:first-child { margin-left: 0; }
.px-trust-line .ava-row .av:nth-child(2) { background: linear-gradient(135deg, #f97316, #fb923c); }
.px-trust-line .ava-row .av:nth-child(3) { background: linear-gradient(135deg, #10b981, #34d399); }
.px-trust-line .ava-row .av:nth-child(4) { background: linear-gradient(135deg, #ec4899, #f472b6); }

.px-hero-visual {
  position: relative;
}
.px-hero-visual img {
  width: 100%;
  height: auto;
  aspect-ratio: 5/4;
  object-fit: cover;
  border-radius: 18px;
}
.px-hero-card-1 {
  position: absolute;
  top: 24px; left: -28px;
  background: #fff;
  border-radius: 14px;
  padding: 14px 18px;
  box-shadow: 0 12px 28px rgba(0,0,0,0.12);
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 2;
}
.px-hero-card-1 .ic {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: var(--c-blue);
  color: #fff;
  display: grid; place-items: center;
  font-size: 16px;
}
.px-hero-card-1 .info .l { font-size: 11px; color: var(--ink-soft); font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; }
.px-hero-card-1 .info .v { font-size: 15px; font-weight: 700; }

.px-hero-card-2 {
  position: absolute;
  bottom: 28px; right: -22px;
  background: #fff;
  border-radius: 14px;
  padding: 14px 18px;
  box-shadow: 0 12px 28px rgba(0,0,0,0.12);
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 2;
}
.px-hero-card-2 .ic {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: var(--success);
  color: #fff;
  display: grid; place-items: center;
  font-size: 16px;
}
.px-hero-card-2 .info .l { font-size: 11px; color: var(--ink-soft); font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; }
.px-hero-card-2 .info .v { font-size: 15px; font-weight: 700; }

@media (max-width: 900px) {
  .px-hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .px-hero-card-1 { left: 14px; }
  .px-hero-card-2 { right: 14px; }
}

/* ===== Trust strip ===== */
.px-trust-strip {
  padding: 28px 0;
  background:
    linear-gradient(90deg, transparent, var(--bg-soft) 20%, var(--bg-soft) 80%, transparent),
    var(--paper);
  border-top: 1px dashed var(--line);
  border-bottom: 1px dashed var(--line);
}
.px-trust-strip .px-wrap {
  display: flex;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
  justify-content: center;
}
.px-trust-strip .ts-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-soft);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.px-trust-strip .ts-logos {
  display: flex;
  gap: 44px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}
.px-trust-strip .ts-logos span {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  color: var(--ink-soft);
  opacity: 0.7;
  letter-spacing: -0.02em;
}

/* ===== Section header ===== */
.px-sec { padding: 64px 0; }
.px-sec.tight { padding: 40px 0; }
.px-sec-head {
  margin-bottom: 28px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}
.px-sec-head h2 {
  font-size: clamp(1.6rem, 2.6vw, 2.1rem);
  margin: 0 0 6px;
  line-height: 1.15;
  font-weight: 800;
}
.px-sec-head p {
  color: var(--ink-soft);
  font-size: 16px;
  margin: 0;
  max-width: 640px;
}
.px-sec-head .px-link {
  font-weight: 700;
  color: var(--c-blue);
  font-size: 14.5px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.px-sec-head .px-link:hover { text-decoration: underline; }

/* ===== Tabs (pill style, distinct from Udemy's underline) ===== */
.px-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 28px;
  padding: 5px;
  background: var(--bg-soft);
  border-radius: 14px;
  width: max-content;
  max-width: 100%;
}
.px-tab {
  background: transparent;
  border: none;
  padding: 9px 16px;
  font-size: 13.5px;
  font-weight: 700;
  font-family: inherit;
  color: var(--ink-soft);
  cursor: pointer;
  border-radius: 10px;
  transition: all 0.18s;
}
.px-tab:hover { color: var(--ink); background: rgba(255,255,255,0.6); }
.px-tab.active {
  color: #fff;
  background: var(--ink);
  box-shadow: 0 2px 0 var(--c-blue);
}

/* ===== Course cards (distinctive layout) =====
   Differences from Udemy/Coursera:
   - White card with border instead of borderless
   - Price overlay on the thumbnail (Udemy puts price below)
   - Duration chip on thumbnail bottom-left
   - Footer row with instructor avatar + "Add to cart" button
*/
.px-courses {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.px-course {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  transition: all 0.2s;
}
.px-course:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(0,0,0,0.08);
  border-color: transparent;
}
.px-course-thumb {
  position: relative;
  aspect-ratio: 16/10;
  overflow: hidden;
}
.px-course-thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.px-course:hover .px-course-thumb img { transform: scale(1.06); }

/* Price chip on thumbnail (top-right) — distinct from Udemy's bottom-text-price */
.px-course-price-chip {
  position: absolute;
  top: 10px; right: 10px;
  background: #fff;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13.5px;
  font-weight: 800;
  color: var(--ink);
  box-shadow: 0 2px 6px rgba(0,0,0,0.12);
  display: flex;
  align-items: center;
  gap: 6px;
}
.px-course-price-chip .was {
  font-size: 11px;
  font-weight: 600;
  color: var(--ink-soft);
  text-decoration: line-through;
}

/* Duration chip on thumbnail (bottom-left) — overlay style */
.px-course-duration-chip {
  position: absolute;
  bottom: 10px; left: 10px;
  background: rgba(28,29,31,0.85);
  color: #fff;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  backdrop-filter: blur(4px);
}

/* Save / heart button on each course card */
.px-course-save {
  position: absolute;
  top: 10px; left: 10px;
  width: 32px; height: 32px;
  background: rgba(255,255,255,0.95);
  border: none;
  border-radius: 50%;
  display: grid; place-items: center;
  color: var(--ink-soft);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.18s;
  z-index: 2;
}
.px-course-save:hover { color: var(--u-purple); background: #fff; transform: scale(1.1); }
.px-course-save.saved { color: var(--u-purple); }

.px-course-body {
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.px-course-cat {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--c-blue);
  margin-bottom: 6px;
}
.px-course-thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}
.px-course-badge {
  position: absolute;
  top: 10px; left: 10px;
  background: var(--gold-bg);
  color: var(--gold);
  padding: 4px 9px;
  border-radius: 4px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.px-course-badge.hot { background: var(--rose-bg); color: var(--rose); }
.px-course-badge.new { background: #e3f2fd; color: var(--c-blue); }
.px-course-badge.vtu { background: #ede9fe; color: var(--u-purple-dark); }

.px-course h3 {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.35;
  margin: 0 0 8px;
  font-family: var(--font-body);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 42px;
}
.px-course .rating-row {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-bottom: 10px;
  font-size: 13px;
}
.px-course .rating-row .num {
  font-weight: 700;
  color: var(--gold);
}
.px-course .rating-row .stars {
  color: var(--gold);
  letter-spacing: 1px;
}
.px-course .rating-row .reviews {
  color: var(--ink-soft);
  font-size: 12px;
}

/* Footer row: instructor avatar + add to cart */
.px-course-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 10px;
  margin-top: auto;
  border-top: 1px solid var(--line-soft);
  gap: 8px;
}
.px-course-instructor {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
}
.px-course-instructor .av {
  width: 26px; height: 26px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--c-blue), var(--u-purple));
  color: #fff;
  display: grid; place-items: center;
  font-weight: 700;
  font-size: 10px;
  flex-shrink: 0;
}
.px-course-instructor .nm {
  font-size: 12px;
  color: var(--ink-soft);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.px-course-cart-btn {
  width: 32px; height: 32px;
  border-radius: 8px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  color: var(--ink);
  display: grid; place-items: center;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
  flex-shrink: 0;
}
.px-course-cart-btn:hover { background: var(--ink); color: #fff; border-color: var(--ink); }

@media (max-width: 1100px) { .px-courses { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 800px) { .px-courses { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 500px) { .px-courses { grid-template-columns: 1fr; } }

/* ===== Category grid (compact 6-col with circular icons) ===== */
.px-cats-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
}
.px-cat {
  background: var(--bg-soft);
  border-radius: 12px;
  padding: 22px;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: all 0.18s;
  border: 1.5px solid transparent;
  position: relative;
  overflow: hidden;
}
.px-cat::before {
  content: "";
  position: absolute;
  left: 0; top: 24px;
  width: 4px; height: 36px;
  background: var(--c-blue);
  border-radius: 0 4px 4px 0;
  transform: scaleY(0);
  transform-origin: center;
  transition: transform 0.25s ease;
}
.px-cat:hover {
  background: #fff;
  border-color: var(--line);
  box-shadow: 0 14px 30px rgba(28,25,23,0.08);
}
.px-cat:hover::before { transform: scaleY(1); }
.px-cat .cat-ic {
  width: 50px; height: 50px;
  border-radius: 50%;  /* circular icons — distinct from rectangular tiles */
  display: grid; place-items: center;
  font-size: 20px;
  color: #fff;
}
.px-cat .cat-name {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.px-cat .cat-meta {
  font-size: 13px;
  color: var(--ink-soft);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.px-cat .cat-meta i {
  transition: transform 0.18s;
  color: var(--ink);
}
.px-cat:hover .cat-meta i { transform: translateX(4px); }

@media (max-width: 1100px) { .px-cats-grid { grid-template-columns: repeat(4, 1fr); } }
@media (max-width: 800px) { .px-cats-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 500px) { .px-cats-grid { grid-template-columns: repeat(2, 1fr); } }

/* ===== Promo banner (cards LEFT, content RIGHT — flipped from Coursera) ===== */
.px-promo {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  background: linear-gradient(135deg, #efe7fd 0%, #d9c7fb 100%);
  border-radius: 14px;
  overflow: hidden;
  margin: 12px 0;
  align-items: stretch;
}
.px-promo-content {
  padding: 40px 36px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  order: 2;  /* flip so content is on the RIGHT */
}
.px-promo-content .label {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--u-purple-dark);
  margin-bottom: 8px;
}
.px-promo-content h3 {
  font-size: clamp(1.5rem, 2.4vw, 1.9rem);
  margin: 0 0 10px;
  line-height: 1.15;
  font-weight: 800;
}
.px-promo-content p {
  color: var(--ink-soft);
  font-size: 15px;
  margin: 0 0 22px;
  max-width: 380px;
}
.px-promo-content .px-btn { width: max-content; }
.px-promo-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  padding: 22px;
  background: rgba(255,255,255,0.4);
  order: 1;
  align-content: center;
}
.px-promo-card {
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px;
  transition: all 0.18s;
  border: 1px solid transparent;
}
.px-promo-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(0,0,0,0.1);
  border-color: var(--u-purple);
}
.px-promo-card .img-wrap {
  width: 72px;
  height: 72px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 26px;
  flex-shrink: 0;
}
.px-promo-card .img-wrap.c1 { background: linear-gradient(135deg, #ff3d7f, #6b1aff); }
.px-promo-card .img-wrap.c2 { background: linear-gradient(135deg, #fbbf24, #f59e0b); }
.px-promo-card .img-wrap.c3 { background: linear-gradient(135deg, #0078d4, #5b3fd9); }
.px-promo-card .img-wrap.c4 { background: linear-gradient(135deg, #ec4899, #f43f5e); }
.px-promo-card .body {
  flex: 1;
  min-width: 0;
}
.px-promo-card .by {
  font-size: 11.5px;
  font-weight: 700;
  color: var(--ink-soft);
  margin-bottom: 3px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.px-promo-card h4 {
  font-size: 14.5px;
  font-weight: 700;
  margin: 0 0 6px;
  line-height: 1.3;
  font-family: var(--font-body);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.px-promo-card .type {
  font-size: 11.5px;
  color: var(--ink-soft);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.px-promo-card .type .star { color: var(--gold); }

@media (max-width: 1100px) {
  .px-promo { grid-template-columns: 1fr; }
  .px-promo-content { order: 0; }
  .px-promo-cards { order: 0; }
}
@media (max-width: 500px) { .px-promo-cards { grid-template-columns: 1fr; } }

/* ===== Career section (tabbed selector + 4-card grid — different from Coursera 3-col) ===== */
.px-career-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 22px;
  padding: 0;
}
.px-career-tab {
  background: transparent;
  border: 1.5px solid var(--line);
  padding: 9px 18px;
  border-radius: 999px;
  font-size: 13.5px;
  font-weight: 700;
  font-family: inherit;
  color: var(--ink);
  cursor: pointer;
  transition: all 0.15s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.px-career-tab:hover { background: var(--bg-soft); }
.px-career-tab.active {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}
.px-career-tab .count {
  font-size: 11px;
  background: var(--bg-soft);
  color: var(--ink-soft);
  padding: 2px 7px;
  border-radius: 999px;
  font-weight: 700;
}
.px-career-tab.active .count { background: rgba(255,255,255,0.18); color: #fff; }

.px-careers {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.px-career-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  text-decoration: none;
  color: var(--ink);
  transition: all 0.18s;
  position: relative;
  overflow: hidden;
}
.px-career-card:hover {
  border-color: var(--c-blue);
  transform: translateY(-4px);
  box-shadow: 0 14px 30px rgba(0,86,210,0.1);
}
.px-career-card .ic-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.px-career-card .ic-top .ico {
  width: 44px; height: 44px;
  border-radius: 12px;
  display: grid; place-items: center;
  color: #fff;
  font-size: 18px;
}
.px-career-card .ic-top .provider {
  font-size: 11px;
  font-weight: 800;
  color: var(--ink-soft);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.px-career-card h4 {
  font-size: 16px;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.01em;
  line-height: 1.25;
  font-family: var(--font-body);
}
.px-career-card .stats-row {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--ink-soft);
  margin-top: auto;
}
.px-career-card .stats-row .s-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-weight: 600;
}
.px-career-card .stats-row .s-item i { color: var(--c-blue); }
.px-career-card .salary-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--c-blue-soft);
  color: var(--c-blue-dark);
  padding: 5px 11px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 700;
  width: max-content;
}

@media (max-width: 1000px) { .px-careers { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 500px) { .px-careers { grid-template-columns: 1fr; } }

/* ===== Features grid (numbered cards with side accent — distinct from typical 4-icon grids) ===== */
.px-feats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.px-feat {
  padding: 28px 24px;
  background: var(--bg-soft);
  border-radius: 14px;
  position: relative;
  transition: all 0.2s;
  overflow: hidden;
  border-left: 3px solid transparent;
}
.px-feat:hover {
  background: #fff;
  border-left-color: var(--c-blue);
  box-shadow: 0 14px 30px rgba(0,0,0,0.06);
}
/* Big number watermark in corner */
.px-feat::before {
  content: attr(data-num);
  position: absolute;
  top: 14px; right: 18px;
  font-family: var(--font-display);
  font-size: 56px;
  font-weight: 800;
  color: var(--ink);
  opacity: 0.06;
  line-height: 1;
  letter-spacing: -0.04em;
}
.px-feat .px-feat-ic {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: grid; place-items: center;
  font-size: 19px;
  color: #fff;
  margin-bottom: 14px;
}
.px-feat.f-1 .px-feat-ic { background: var(--c-blue); }
.px-feat.f-2 .px-feat-ic { background: var(--u-purple); }
.px-feat.f-3 .px-feat-ic { background: #ea580c; }
.px-feat.f-4 .px-feat-ic { background: var(--success); }
.px-feat h4 {
  font-size: 16px;
  margin: 0 0 8px;
  font-weight: 700;
}
.px-feat p {
  font-size: 14px;
  color: var(--ink-soft);
  margin: 0;
  line-height: 1.55;
}

@media (max-width: 900px) { .px-feats { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 500px) { .px-feats { grid-template-columns: 1fr; } }

/* ===== Brand strip ===== */
.px-brands {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}
.px-brands a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  transition: all 0.15s;
}
.px-brands a:hover { border-color: var(--ink); }
.px-brands .b-logo {
  width: 22px; height: 22px;
  border-radius: 4px;
  display: grid; place-items: center;
  color: #fff;
  font-size: 11px;
  font-weight: 800;
}

/* ===== VTU special band ===== */
.px-vtu {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  background: linear-gradient(135deg, var(--c-blue) 0%, #065f46 60%, var(--ink) 100%);
  color: #fff;
  border-radius: 22px;
  overflow: hidden;
  align-items: stretch;
  position: relative;
}
.px-vtu::after {
  content: "";
  position: absolute;
  top: -100px; left: 30%;
  width: 280px; height: 280px;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(251,113,133,0.3), transparent);
  pointer-events: none;
}
.px-vtu-content {
  padding: 44px 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.px-vtu-content .label {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 12px;
  opacity: 0.9;
}
.px-vtu-content h2 {
  color: #fff;
  font-size: clamp(1.6rem, 2.8vw, 2.2rem);
  margin: 0 0 12px;
  line-height: 1.1;
}
.px-vtu-content p {
  font-size: 16px;
  opacity: 0.92;
  margin: 0 0 22px;
  max-width: 450px;
  line-height: 1.5;
}
.px-vtu-perks {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin-bottom: 24px;
}
.px-vtu-perks li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14.5px;
}
.px-vtu-perks i {
  width: 22px; height: 22px;
  background: rgba(255,255,255,0.9);
  color: var(--c-blue);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  flex-shrink: 0;
}
.px-vtu-content .row { display: flex; gap: 10px; flex-wrap: wrap; }
.px-vtu-content .px-btn-blue { background: #fff; color: var(--c-blue); border-color: #fff; }
.px-vtu-content .px-btn-blue:hover { background: rgba(255,255,255,0.9); }
.px-vtu-content .px-btn-outline { background: transparent; color: #fff; border-color: rgba(255,255,255,0.5); }
.px-vtu-content .px-btn-outline:hover { background: rgba(255,255,255,0.1); }
.px-vtu-visual {
  position: relative;
  min-height: 380px;
  background: url('https://images.unsplash.com/photo-1523580494863-6f3031224c94?w=900&q=80') center/cover;
}
.px-vtu-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(0,86,210,0.55), transparent);
}
.px-vtu-stat {
  position: absolute;
  bottom: 28px; right: 28px;
  background: #fff;
  color: var(--ink);
  border-radius: 14px;
  padding: 16px 20px;
  box-shadow: 0 12px 30px rgba(0,0,0,0.18);
  z-index: 2;
}
.px-vtu-stat .num {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 800;
  color: var(--c-blue);
  line-height: 1;
}
.px-vtu-stat .lbl {
  font-size: 12.5px;
  color: var(--ink-soft);
  margin-top: 3px;
}

@media (max-width: 900px) {
  .px-vtu { grid-template-columns: 1fr; }
  .px-vtu-visual { min-height: 200px; }
}

/* ===== Testimonials ===== */
.px-tests {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.px-test {
  background: #fff;
  border: 1.5px solid var(--line);
  border-radius: 14px;
  padding: 32px 28px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  transition: all 0.2s;
}
.px-test:hover { transform: translateY(-3px); border-color: var(--c-blue); box-shadow: 0 18px 36px rgba(28,25,23,0.06); }
.px-test::before {
  content: "\201C";
  position: absolute;
  top: -40px; right: 16px;
  font-size: 140px;
  font-family: var(--font-italic);
  color: var(--c-blue-soft);
  line-height: 1;
}
.px-test .stars { color: var(--gold); margin-bottom: 12px; font-size: 14px; letter-spacing: 2px; position: relative; z-index: 1; }
.px-test p {
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink);
  margin: 0 0 22px;
  flex: 1;
  position: relative;
  z-index: 1;
}
.px-test .who {
  display: flex;
  align-items: center;
  gap: 12px;
}
.px-test .av {
  width: 44px; height: 44px;
  border-radius: 50%;
  display: grid; place-items: center;
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  background: linear-gradient(135deg, var(--c-blue), var(--u-purple));
}
.px-test .who .n { font-weight: 700; font-size: 14.5px; }
.px-test .who .r { font-size: 12.5px; color: var(--ink-soft); }

@media (max-width: 900px) { .px-tests { grid-template-columns: 1fr; } }

/* ===== Footer (platform-style) ===== */
.px-footer {
  background: #0d1117;
  color: #c9d1d9;
  padding: 64px 0 28px;
  margin-top: 40px;
}
.px-footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 44px;
}
.px-footer-brand-col {
  max-width: 340px;
}
.px-footer .px-logo {
  color: #fff;
  margin-bottom: 16px;
}
.px-footer-brand-col p {
  font-size: 14px;
  color: #8b949e;
  line-height: 1.6;
  margin: 0 0 20px;
}
.px-footer-social {
  display: flex;
  gap: 10px;
}
.px-footer-social a {
  width: 36px; height: 36px;
  background: #21262d;
  color: #c9d1d9;
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-size: 14px;
  transition: all 0.15s;
  text-decoration: none;
}
.px-footer-social a:hover { background: var(--c-blue); color: #fff; }
.px-footer h5 {
  color: #fff;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  margin: 0 0 18px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.px-footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 11px;
}
.px-footer-links a {
  color: #8b949e;
  text-decoration: none;
  font-size: 14px;
  transition: color 0.15s;
}
.px-footer-links a:hover { color: #fff; }
.px-footer-bottom {
  padding-top: 24px;
  border-top: 1px solid #21262d;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 13px;
  color: #8b949e;
}
.px-footer-bottom .legal { display: flex; gap: 22px; }
.px-footer-bottom .legal a { color: #8b949e; text-decoration: none; }
.px-footer-bottom .legal a:hover { color: #fff; }

@media (max-width: 1000px) {
  .px-footer-grid { grid-template-columns: 1fr 1fr 1fr; }
  .px-footer-brand-col { grid-column: 1 / -1; max-width: 100%; }
}
@media (max-width: 600px) {
  .px-footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .px-footer-brand-col { grid-column: 1 / -1; }
}

/* ===== Final CTA ===== */
.px-final-cta {
  background: linear-gradient(135deg, #ecfdf5 0%, #fef3c7 60%, #fde2e4 100%);
  border-radius: 22px;
  padding: 56px 48px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 32px;
  position: relative;
  overflow: hidden;
  border: 1.5px solid var(--line);
}
.px-final-cta::before {
  content: "";
  position: absolute;
  top: -80px; right: 25%;
  width: 240px; height: 240px;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(4,120,87,0.15), transparent);
  pointer-events: none;
}
.px-final-cta > * { position: relative; z-index: 1; }
.px-final-cta h2 {
  font-size: clamp(1.6rem, 2.6vw, 2.2rem);
  margin: 0 0 8px;
  line-height: 1.15;
}
.px-final-cta p {
  font-size: 16px;
  color: var(--ink-soft);
  margin: 0;
  max-width: 540px;
}
.px-final-cta .ctas { display: flex; gap: 10px; flex-wrap: wrap; }
@media (max-width: 800px) {
  .px-final-cta { grid-template-columns: 1fr; padding: 36px 24px; text-align: center; }
  .px-final-cta .ctas { justify-content: center; }
}