/* ===== Reset & Base ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #0d9488;
  --primary-dark: #0f766e;
  --primary-darker: #115e59;
  --accent: #f97316;
  --accent-dark: #ea580c;
  --dark: #0b1f2a;
  --dark-2: #0f2c3a;
  --text: #1e293b;
  --text-light: #64748b;
  --bg: #ffffff;
  --bg-soft: #f1f5f9;
  --bg-softer: #f8fafc;
  --border: #e2e8f0;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 10px 30px -12px rgba(15, 44, 58, 0.18);
  --shadow-lg: 0 24px 60px -20px rgba(15, 44, 58, 0.28);
  --container: 1160px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Noto Sans Bengali", system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-weight: 600;
  font-size: 1rem;
  padding: 12px 24px;
  border-radius: 999px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease),
    background 0.25s var(--ease);
  white-space: nowrap;
}

.btn--accent {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 20px -8px rgba(249, 115, 22, 0.6);
}

.btn--accent:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 14px 28px -10px rgba(249, 115, 22, 0.7);
}

.btn--lg {
  padding: 15px 32px;
  font-size: 1.05rem;
}

.btn--pulse {
  animation: pulse 2.2s infinite;
}

@keyframes pulse {
  0%,
  100% {
    box-shadow: 0 8px 20px -8px rgba(249, 115, 22, 0.6),
      0 0 0 0 rgba(249, 115, 22, 0.45);
  }
  50% {
    box-shadow: 0 8px 20px -8px rgba(249, 115, 22, 0.6),
      0 0 0 14px rgba(249, 115, 22, 0);
  }
}

/* ===== Announcement Bar ===== */
.announcement {
  background: linear-gradient(90deg, var(--primary-darker), var(--primary-dark));
  color: #fff;
  font-size: 0.92rem;
}

.announcement__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 9px 20px;
  flex-wrap: wrap;
  text-align: center;
}

.announcement__icon {
  margin-right: 6px;
}

.announcement__cta {
  color: #fff;
  font-weight: 600;
  border-bottom: 1px solid rgba(255, 255, 255, 0.5);
  transition: opacity 0.2s;
}

.announcement__cta:hover {
  opacity: 0.8;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  padding: 70px 0 80px;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--dark) 0%, var(--primary-darker) 55%, var(--primary-dark) 100%);
  z-index: -2;
}

.hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% 20%, rgba(249, 115, 22, 0.18), transparent 45%),
    radial-gradient(circle at 10% 90%, rgba(13, 148, 136, 0.35), transparent 50%);
}

.hero__inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 50px;
}

.hero__title {
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 18px;
}

.highlight {
  color: #fdba74;
  position: relative;
}

.hero__subtitle {
  font-size: 1.12rem;
  color: rgba(255, 255, 255, 0.85);
  max-width: 540px;
  margin-bottom: 30px;
}

.hero__actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* Video frame */
.hero__video {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.video-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 3px solid rgba(255, 255, 255, 0.15);
  background: #000;
}

.video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.hero__video-caption {
  margin-top: 14px;
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.8);
  text-align: center;
}

/* ===== Section helpers ===== */
.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}

.eyebrow {
  display: inline-block;
  color: var(--primary);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
  text-transform: uppercase;
}

.section-head h2 {
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 12px;
}

.section-head p {
  color: var(--text-light);
  font-size: 1.05rem;
}

/* ===== Notice Section ===== */
.notice {
  padding: 80px 0;
  background: var(--bg-soft);
}

.notice__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

.notice__content h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--dark);
  margin: 8px 0 16px;
}

.notice__content p {
  color: var(--text-light);
  margin-bottom: 20px;
}

.check-list {
  display: grid;
  gap: 12px;
  margin-bottom: 28px;
}

.check-list li {
  position: relative;
  padding-left: 32px;
  font-weight: 500;
  color: var(--text);
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 1px;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
}

/* ===== Why Section ===== */
.why {
  padding: 80px 0;
}

.why__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.why__card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 24px;
  text-align: center;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease),
    border-color 0.3s var(--ease);
}

.why__card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: transparent;
}

.why__icon {
  font-size: 2.4rem;
  color: var(--primary);
  margin-bottom: 14px;
}

.why__card h3 {
  font-size: 1.18rem;
  color: var(--dark);
  margin-bottom: 8px;
}

.why__card p {
  color: var(--text-light);
  font-size: 0.95rem;
}

/* ===== Courses ===== */
.courses {
  padding: 80px 0;
  background: var(--dark);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.courses::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 90% 10%, rgba(13, 148, 136, 0.25), transparent 45%);
}

.courses .section-head h2 {
  color: #fff;
}

.courses .eyebrow {
  color: #5eead4;
}

.courses .section-head p {
  color: rgba(255, 255, 255, 0.7);
}

.courses__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  position: relative;
}

.course-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  color: var(--text);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.course-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.course-card__media {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.course-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--ease);
}

.course-card:hover .course-card__media img {
  transform: scale(1.06);
}

.course-card__tag {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--accent);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 999px;
}

.course-card__tag--free {
  background: var(--primary);
}

.course-card__body {
  padding: 22px 22px 26px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.course-card__body h3 {
  font-size: 1.2rem;
  color: var(--dark);
  margin-bottom: 8px;
}

.course-card__body p {
  color: var(--text-light);
  font-size: 0.95rem;
  margin-bottom: 20px;
  flex: 1;
}

.course-card__btn {
  align-self: flex-start;
  font-size: 0.95rem;
  padding: 10px 20px;
}

/* ===== Benefits ===== */
.benefits {
  padding: 80px 0;
  background: var(--bg-soft);
}

.benefits__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.benefit {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px 26px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border: 1px solid var(--border);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.benefit:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
}

.benefit__icon {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(13, 148, 136, 0.12), rgba(13, 148, 136, 0.04));
  color: var(--primary);
  font-size: 1.6rem;
  margin-bottom: 6px;
}

.benefit h3 {
  font-size: 1.12rem;
  color: var(--dark);
}

.benefit p {
  color: var(--text-light);
  font-size: 0.93rem;
}

/* ===== FAQ ===== */
.faq {
  padding: 80px 0;
}

.faq__inner {
  max-width: 820px;
}

.faq__list {
  display: grid;
  gap: 14px;
}

.faq__item {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 22px;
  transition: box-shadow 0.25s var(--ease), background 0.25s var(--ease);
}

.faq__item[open] {
  background: #fff;
  box-shadow: var(--shadow);
}

.faq__item summary {
  list-style: none;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--dark);
  padding: 16px 0;
  position: relative;
  padding-right: 36px;
}

.faq__item summary::-webkit-details-marker {
  display: none;
}

.faq__item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  color: var(--primary);
  font-weight: 400;
  transition: transform 0.3s var(--ease);
}

.faq__item[open] summary::after {
  content: "−";
}

.faq__item p {
  color: var(--text-light);
  padding: 0 0 18px;
}

/* ===== Final CTA ===== */
.final-cta {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--primary-darker), var(--primary-dark));
  position: relative;
  overflow: hidden;
}

.final-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 30%, rgba(249, 115, 22, 0.2), transparent 40%);
}

.final-cta__inner {
  text-align: center;
  color: #fff;
  position: relative;
  max-width: 680px;
}

.final-cta__inner h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  margin-bottom: 14px;
}

.final-cta__inner p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1.1rem;
  margin-bottom: 30px;
}

/* ===== Floating CTA ===== */
.float-cta {
  position: fixed;
  bottom: 22px;
  right: 22px;
  z-index: 90;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  padding: 14px 24px;
  border-radius: 999px;
  box-shadow: 0 10px 26px -8px rgba(249, 115, 22, 0.7);
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease),
    background 0.25s var(--ease);
}

.float-cta.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.float-cta:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
}

/* ===== Reveal Animations ===== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 920px) {
  .hero__inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero__video {
    order: -1;
    max-width: 560px;
    margin: 0 auto;
  }

  .notice__inner {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .why__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .courses__grid {
    grid-template-columns: 1fr;
    max-width: 460px;
    margin: 0 auto;
  }

  .benefits__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 540px) {
  .hero {
    padding: 48px 0 60px;
  }

  .hero__actions .btn {
    width: 100%;
  }

  .why__grid,
  .benefits__grid {
    grid-template-columns: 1fr;
  }

  .announcement__inner {
    flex-direction: column;
    gap: 6px;
  }

  .float-cta {
    left: 16px;
    right: 16px;
    bottom: 16px;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}