:root {
  --bg: #f6f8fc;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #667085;
  --accent: #1d4ed8;
  --border: #dbe3f0;
  --shadow: 0 12px 32px rgba(15, 23, 42, 0.08);
  --radius: 18px;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.5;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(59, 130, 246, 0.1), transparent 32%),
    linear-gradient(180deg, #f8fbff 0%, #f4f6fb 100%);
}

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

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

a:hover {
  text-decoration: underline;
}

.container {
  width: min(var(--max-width), calc(100% - 32px));
  margin: 0 auto;
}

header {
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(237, 243, 255, 0.96) 100%);
  backdrop-filter: blur(10px);
}

.hero {
  padding: 56px 0 32px;
}

.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  line-height: 1.08;
}

.hero p {
  margin: 0 0 18px;
  max-width: 820px;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-note {
  max-width: 900px;
  padding: 14px 16px;
  border-left: 4px solid #93c5fd;
  background: rgba(255, 255, 255, 0.7);
  border-radius: 12px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.button {
  display: inline-block;
  padding: 12px 18px;
  border-radius: 999px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.button:hover {
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(29, 78, 216, 0.2);
}

.button.secondary {
  background: #ffffff;
  color: var(--text);
  border-color: var(--border);
}

.button.secondary:hover {
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.08);
}

.jump-nav {
  padding: 16px 0 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.jump-nav a {
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.82);
  color: var(--text);
  transition: transform 0.15s ease, background 0.15s ease;
}

.jump-nav a:hover {
  text-decoration: none;
  background: #ffffff;
  transform: translateY(-1px);
}

main {
  padding: 36px 0 64px;
}

.featured-grid,
.video-grid {
  display: grid;
  gap: 18px;
}

.featured-grid {
  grid-template-columns: minmax(0, 1fr);
  max-width: 760px;
  margin-bottom: 34px;
}

.section {
  margin-bottom: 42px;
}

.section-header {
  margin-bottom: 18px;
  padding: 24px 26px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.98) 0%, rgba(236, 244, 255, 0.96) 100%);
  box-shadow: var(--shadow);
}

.section-header h2 {
  margin: 0 0 8px;
  font-size: 1.7rem;
}

.section-header p {
  margin: 0;
  max-width: 860px;
  color: var(--muted);
}

.featured-video,
.card,
.info-box {
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.featured-video {
  display: flex;
  flex-direction: column;
}

.thumb {
  aspect-ratio: 16 / 9;
  background: #edf2fb;
  overflow: hidden;
}

.thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.featured-video .content {
  padding: 18px 20px 20px;
}

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

.card .content {
  padding: 12px 14px 16px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 0.88rem;
  letter-spacing: 0.02em;
}

.featured-video h2,
.card h3 {
  margin: 0;
  line-height: 1.3;
}

.featured-video h2 {
  font-size: 1.5rem;
}

.card h3 {
  font-size: 1rem;
}

.featured-video p:last-child,
.card p:last-child {
  margin-bottom: 0;
}

.duration {
  color: var(--muted);
  font-weight: 500;
  white-space: nowrap;
}

.meta {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.info-box {
  padding: 18px;
}

.imprint-box {
  background: rgba(255, 255, 255, 0.92);
}

footer {
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.85);
}

footer p {
  margin: 0;
  padding: 20px 0 28px;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 980px) {
  .video-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .container {
    width: min(var(--max-width), calc(100% - 20px));
  }

  .hero {
    padding: 42px 0 24px;
  }

  .section-header,
  .featured-video .content,
  .card .content,
  .info-box {
    padding-left: 16px;
    padding-right: 16px;
  }

  .video-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}