/* =========================================================
   BiSTEM24 HOME PAGE
   Layout aligned to the supplied reference screenshots
========================================================= */

:root {
  --bistem-navy: #182f55;
  --bistem-blue: #2479ad;
  --bistem-orange: #ed7d24;
  --bistem-red: #df4144;
  --bistem-green: #439f86;
  --bistem-white: #ffffff;
  --bistem-text: #222222;
  --bistem-light-blue: #e8f0f9;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  width: 100%;
  scroll-behavior: smooth;
}

body {
  width: 100%;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
  color: var(--bistem-text);
  background: var(--bistem-white);
  font-family: Arial, Helvetica, sans-serif;
}

img,
video {
  max-width: 100%;
}

.home-page {
  width: 100%;
  margin: 0;
  padding: 0;
}

.home-page section {
  position: relative;
}

/* HERO SLIDER */

.home-hero,
.hero-slider {
  width: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

.hero-slider {
  position: relative;
}

.hero-track {
  display: flex;
  width: 400%;
  margin: 0;
  padding: 0;
  transform: translateX(0);
  transition: transform 0.8s ease-in-out;
  will-change: transform;
}

.hero-slide {
  position: relative;
  flex: 0 0 25%;
  width: 25%;
  height: clamp(520px, 43vw, 720px);
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: var(--bistem-navy);
}

.hero-image {
  display: block;
  width: 100%;
  height: 100%;
  margin: 0;
  object-fit: cover;
  object-position: center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(12, 24, 39, 0.28);
}

.hero-content {
  width: min(100%, 1000px);
  margin: 0 auto;
  padding: 12px;
  color: var(--bistem-white);
  text-align: center;
}

.hero-content h1 {
  max-width: 900px;
  margin: 0 auto 20px;
  color: var(--bistem-white);
  font-size: clamp(34px, 3.2vw, 52px);
  font-weight: 800;
  line-height: 1.2;
  overflow-wrap: normal;
  text-shadow: 0 2px 10px rgba(91, 6, 250, 0.18);
}

.hero-content p {
  max-width: 780px;
  margin: 0 auto;
  color: var(--bistem-white);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(16px, 1.2vw, 20px);
  line-height: 1.5;
  letter-spacing: 0.4px;
  overflow-wrap: normal;
}

/* BUTTONS */

.hero-button,
.purpose-button,
.strategic-partnerships-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  margin-top: 26px;
  padding: 13px 28px;
  border: 0;
  border-radius: 0;
  background: #ed7d24;
  color: #ffffff;
  text-decoration: none;
  text-align: center;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1.3px;
  line-height: 1.4;
  transition: background 0.2s ease, color 0.2s ease;
}

.hero-button:hover,
.purpose-button:hover,
.strategic-partnerships-button:hover {
  background: var(--bistem-navy);
  color: #ffffff;
}

/* SECTION SPACING */

.home-purpose-section,
.learning-transformations-section,
.news-highlights-section,
.strategic-partnerships-section {
  width: 100%;
  margin: 0;
  padding: 78px 24px;
}

.purpose-container,
.learning-section-heading,
.learning-transformations-container,
.news-highlights-container,
.strategic-partnerships-container {
  width: 100%;
  margin-right: auto;
  margin-left: auto;
}

.purpose-title,
.news-highlights-title,
.strategic-partnerships-title {
  color: var(--bistem-red);
  font-size: clamp(30px, 3vw, 46px);
  font-weight: 700;
  line-height: 1.35;
  text-align: center;
  overflow-wrap: normal;
}

/* WHAT / HOW / WHY */

.home-purpose-section {
  background: #ffffff;
}

.purpose-container {
  max-width: 1200px;
  text-align: center;
}

.purpose-title {
  margin: 0 0 72px;
}

.purpose-grid {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 36px;
  width: 100%;
  margin: 0 auto;
}

.purpose-item {
  flex: 0 1 390px;
  width: 390px;
  min-width: 0;
  margin: 0;
  padding: 0;
  text-align: center;
}

.purpose-image {
  display: block;
  width: 100%;
  max-width: 390px;
  height: auto;
  margin: 0 auto;
  object-fit: contain;
}

.purpose-button {
  margin-top: 70px;
  min-width: 185px;
}

/* LEARNING TRANSFORMATIONS */

.learning-transformations-section {
  background: #ffffff;
}

.learning-section-heading {
  max-width: 1500px;
  margin: 0 auto 48px;
  text-align: center;
}

.learning-section-heading h2 {
  width: 100%;
  margin: 0 0 20px;
  padding: 14px 22px;
  border-radius: 0;
  background: #202695;
  color: #fffdfb;
  font-size: clamp(28px, 3vw, 46px);
  font-weight: 800;
  line-height: 1.35;
  text-align: center;
  overflow-wrap: normal;
}

.learning-section-heading p {
  width: 100%;
  max-width: 1250px;
  margin: 0 auto;
  color: var(--bistem-red);
  font-size: clamp(18px, 1.7vw, 28px);
  line-height: 1.65;
  text-align: center;
  overflow-wrap: normal;
}

.learning-transformations-container {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  max-width: 1340px;
  column-gap: 32px;
  row-gap: 30px;
  align-items: start;
}

.learning-column {
  display: flex;
  flex-direction: column;
  width: 100%;
  min-width: 0;
  margin: 0;
  padding: 0;
}

.learning-image,
.learning-video {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  margin: 0;
  border-radius: 0;
  object-fit: cover;
}

.learning-video {
  background: #111111;
  object-fit: contain;
}

.learning-left-text,
.learning-middle-text,
.learning-right-text {
  margin: 18px 0 0;
  color: #555555;
  font-size: clamp(15px, 1.25vw, 18px);
  line-height: 1.7;
  text-align: left;
  overflow-wrap: normal;
}

.learning-middle-text {
  font-weight: 700;
}

/* NEWS HIGHLIGHTS */

.news-highlights-section {
  background: #ffffff;
  border-top: 1px solid #eeeeee;
}

.news-highlights-container {
  max-width: 1030px;
}

.news-highlights-title {
  margin: 0 0 42px;
  font-size: clamp(28px, 2.2vw, 36px);
}

.news-slider {
  position: relative;
  width: 100%;
  margin: 0 auto;
  padding: 0;
  overflow: hidden;
  border-radius: 0;
  background: #ffffff;
  box-shadow: none;
}

.news-track {
  display: flex;
  width: 600%;
  margin: 0;
  padding: 0;
  transform: translateX(0);
  transition: transform 0.8s ease-in-out;
  will-change: transform;
}

.news-slide {
  position: relative;
  display: flex;
  flex: 0 0 16.6666667%;
  width: 16.6666667%;
  height: clamp(380px, 48vw, 600px);
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: #ffffff;
}

.news-image {
  display: block;
  width: 100%;
  height: 100%;
  margin: auto;
  object-fit: contain;
  object-position: center;
}

.news-caption {
  position: absolute;
  z-index: 2;
  top: 0;
  right: 0;
  left: 0;
  width: 100%;
  margin: 0;
  padding: 12px 20px;
  background: rgba(10, 13, 54, 0.94);
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
  font-family: Arial, Helvetica, sans-serif;
  font-size: clamp(12px, 1vw, 15px);
  font-weight: 500;
  line-height: 1.5;
  text-align: center;
}

/* STRATEGIC PARTNERSHIPS */

.strategic-partnerships-section {
  background: #ffffff;
  border-top: 1px solid #dddddd;
}

.strategic-partnerships-container {
  max-width: 1250px;
  text-align: center;
}

.strategic-partnerships-title {
  margin: 0 0 54px;
  font-size: clamp(29px, 2.5vw, 40px);
  line-height: 1.45;
}

.partner-logos {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 24px;
  align-items: center;
  justify-items: center;
  width: 100%;
}

.partner-logo {
  display: flex;
  width: 100%;
  min-width: 0;
  height: 150px;
  align-items: center;
  justify-content: center;
  padding: 8px;
  overflow: hidden;
  border: 0;
  border-radius: 0;
  background: #ffffff;
}

.partner-logo img {
  display: block;
  max-width: 100%;
  max-height: 140px;
  width: auto;
  height: auto;
  object-fit: contain;
}

.strategic-partnerships-button {
  min-width: 235px;
  margin-top: 22px;
}

/* TABLET */

@media (max-width: 1000px) {
  .hero-slide {
    height: 540px;
  }

  .purpose-container {
    max-width: 900px;
  }

  .purpose-grid {
    gap: 24px;
  }

  .purpose-item {
    flex-basis: 30%;
    width: 30%;
  }

  .learning-transformations-container {
    column-gap: 22px;
  }

  .partner-logos {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* MOBILE */

@media (max-width: 650px) {
  .hero-slide {
    height: 500px;
  }

  .hero-overlay {
    padding: 16px;
    background: rgba(12, 24, 39, 0.38);
  }

  .hero-content {
    width: 100%;
    padding: 8px;
  }

  .hero-content h1 {
    margin-bottom: 18px;
    font-size: clamp(28px, 7vw, 36px);
    line-height: 1.2;
  }

  .hero-content p {
    font-size: 15px;
    line-height: 1.55;
  }

  .hero-button,
  .purpose-button,
  .strategic-partnerships-button {
    max-width: 100%;
    padding: 12px 18px;
    font-size: 10px;
    letter-spacing: 0.8px;
  }

  .home-purpose-section,
  .learning-transformations-section,
  .news-highlights-section,
  .strategic-partnerships-section {
    padding: 48px 18px 54px;
  }

  .purpose-title {
    margin-bottom: 38px;
  }

  .purpose-grid {
    flex-direction: column;
    align-items: center;
    gap: 30px;
  }

  .purpose-item {
    flex: 0 1 auto;
    width: min(100%, 360px);
  }

  .purpose-image {
    max-width: 100%;
  }

  .purpose-button {
    margin-top: 36px;
  }

  .learning-section-heading {
    margin-bottom: 34px;
  }

  .learning-section-heading h2 {
    margin-bottom: 20px;
    padding: 14px 12px;
    font-size: 27px;
  }

  .learning-section-heading p {
    font-size: 17px;
  }

  .learning-transformations-container {
    grid-template-columns: 1fr;
    row-gap: 34px;
  }

  .learning-column {
    width: 100%;
    max-width: 540px;
    margin: 0 auto;
  }

  .learning-left-text,
  .learning-middle-text,
  .learning-right-text {
    margin-top: 14px;
    font-size: 16px;
    line-height: 1.65;
  }

  .news-highlights-title {
    margin-bottom: 28px;
  }

  .news-slide {
    height: 360px;
  }

  .news-caption {
    padding: 10px 12px;
    font-size: 11px;
    line-height: 1.4;
  }

  .strategic-partnerships-title {
    margin-bottom: 30px;
  }

  .partner-logos {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .partner-logo {
    height: 125px;
    padding: 8px;
  }

  .partner-logo img {
    max-height: 110px;
  }

  .strategic-partnerships-button {
    min-width: 0;
    margin-top: 28px;
  }
}

@media (max-width: 400px) {
  .hero-slide {
    height: 460px;
  }

  .hero-content h1 {
    font-size: 27px;
  }

  .hero-content p {
    font-size: 14px;
  }

  .learning-section-heading h2 {
    font-size: 24px;
  }

  .news-slide {
    height: 310px;
  }

  .news-caption {
    padding: 8px 9px;
    font-size: 10px;
  }

  .partner-logo {
    height: 112px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero-track,
  .news-track,
  .hero-button,
  .purpose-button,
  .strategic-partnerships-button {
    transition: none !important;
  }
}