:root {
  --accent: #1f7a8c;
  --accent-dark: #0b3d4a;
  --bg: #f3f7fa;
  --text: #1b1b1f;
  --muted: #5a646e;
  --card-bg: #ffffff;
  --shadow: 0 18px 36px rgba(15, 36, 64, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a {
  color: var(--accent);
  text-decoration: none;
}

header {
  background: linear-gradient(120deg, var(--accent) 0%, #32a5bf 60%, #80d0f0 100%);
  color: #fff;
  padding: 48px 24px;
  text-align: center;
  box-shadow: var(--shadow);
}

header h1 {
  margin: 0 0 12px;
  font-size: clamp(2rem, 3vw, 2.8rem);
}

header p {
  margin: 0;
  font-size: clamp(1rem, 2vw, 1.2rem);
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

main {
  max-width: 1080px;
  margin: 32px auto 64px;
  padding: 0 24px;
}

.section-title {
  font-size: 1.8rem;
  margin-bottom: 16px;
}

.ad-container {
  max-width: 728px;
  margin: 0 auto 32px;
  padding: 0 12px;
}

.spotlight-stack {
  max-width: 460px;
  margin: 0 auto 40px;
  display: grid;
  gap: 18px;
}

.spotlight-card {
  position: relative;
  overflow: hidden;
  border-radius: 18px;
  background: var(--card-bg);
  box-shadow: var(--shadow);
}

.spotlight-card img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  display: block;
}

.hero-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  margin-bottom: 40px;
}

.hero-card {
  position: relative;
  overflow: hidden;
  border-radius: 18px;
  box-shadow: var(--shadow);
  background: var(--card-bg);
}

.hero-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.play-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: linear-gradient(180deg, rgba(15, 36, 64, 0.2), rgba(15, 36, 64, 0.6));
  transition: background 0.3s ease;
}

.hero-card:hover .play-overlay,
.spotlight-card:hover .play-overlay {
  background: linear-gradient(180deg, rgba(15, 36, 64, 0.1), rgba(15, 36, 64, 0.4));
}

.play-button {
  border: none;
  background: rgba(255, 255, 255, 0.92);
  color: var(--accent);
  border-radius: 999px;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  box-shadow: 0 12px 20px rgba(0, 0, 0, 0.12);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.play-button:hover:not([disabled]) {
  transform: translateY(-2px);
  box-shadow: 0 16px 24px rgba(0, 0, 0, 0.16);
}

.play-button[disabled] {
  opacity: 0.7;
  cursor: progress;
}

.play-button span.icon {
  width: 14px;
  height: 14px;
  border-style: solid;
  border-width: 7px 0 7px 12px;
  border-color: transparent transparent transparent var(--accent);
}

.alert {
  margin-top: 12px;
  font-size: 0.95rem;
  color: var(--muted);
  text-align: center;
}

.article {
  background: var(--card-bg);
  padding: 32px;
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.article h2 {
  margin-top: 0;
  font-size: 1.6rem;
}

.article h3 {
  font-size: 1.25rem;
  margin-top: 28px;
}

.article p {
  margin-bottom: 18px;
}

.article ul {
  margin: 0 0 18px 20px;
  padding: 0;
}

.article li {
  margin-bottom: 10px;
}

.footer-note {
  margin-top: 48px;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 600px) {
  header {
    padding: 36px 18px;
  }

  .article {
    padding: 24px;
  }

  .play-button {
    width: 190px;
    justify-content: center;
  }

  .spotlight-card img {
    height: 200px;
  }
}