:root {
  --bg-top: #f3ede1;
  --bg-bottom: #d7e3eb;
  --panel: rgba(255, 250, 243, 0.76);
  --panel-strong: rgba(255, 255, 255, 0.88);
  --border: rgba(34, 43, 51, 0.1);
  --text-main: #1f2a33;
  --text-soft: #4b5a66;
  --accent: #b2542c;
  --accent-dark: #7a3217;
  --shadow: 0 24px 60px rgba(32, 42, 50, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Manrope", "Segoe UI", sans-serif;
  color: var(--text-main);
  background:
    radial-gradient(circle at top left, rgba(178, 84, 44, 0.18), transparent 30%),
    radial-gradient(circle at bottom right, rgba(93, 127, 154, 0.18), transparent 28%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.26) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.26) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.5), transparent 80%);
}

.page-shell {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 56px 0 72px;
  position: relative;
}

.hero-panel {
  padding: 40px 42px;
  border: 1px solid var(--border);
  border-radius: 28px;
  background: var(--panel);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.section-label {
  margin: 0 0 14px;
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.page-title {
  margin: 0;
  font-family: "Castoro", Georgia, serif;
  font-size: clamp(3rem, 9vw, 5.8rem);
  line-height: 0.94;
  letter-spacing: -0.04em;
}

.author-line {
  max-width: 840px;
  margin: 22px 0 0;
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--text-soft);
}

.content-grid {
  display: grid;
  gap: 24px;
  margin-top: 24px;
}

.content-card {
  border: 1px solid var(--border);
  border-radius: 28px;
  background: var(--panel-strong);
  box-shadow: var(--shadow);
}

.intro-card {
  padding: 34px 32px;
}

.intro-topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.intro-card h2,
.video-card h2 {
  margin: 0 0 16px;
  font-family: "Castoro", Georgia, serif;
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  line-height: 1.08;
}

.intro-card p:not(.section-label) {
  margin: 0 0 16px;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-soft);
}

.intro-card p:last-child {
  margin-bottom: 0;
}

.intro-copy {
  display: none;
}

.intro-copy.is-active {
  display: block;
}

.lang-toggle {
  display: inline-flex;
  align-items: center;
  padding: 4px;
  border: 1px solid rgba(178, 84, 44, 0.18);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.lang-button {
  border: 0;
  min-width: 58px;
  padding: 8px 14px;
  border-radius: 999px;
  background: transparent;
  color: var(--text-soft);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background-color 180ms ease, color 180ms ease, box-shadow 180ms ease;
}

.lang-button.is-active {
  background: linear-gradient(180deg, var(--accent), var(--accent-dark));
  color: #fff8f1;
  box-shadow: 0 10px 20px rgba(122, 50, 23, 0.22);
}

.video-card {
  padding: 24px;
}

.video-header {
  padding: 10px 10px 18px;
}

.video-frame {
  position: relative;
  overflow: hidden;
  border-radius: 22px;
  background: #0f1519;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.video-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-radius: inherit;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.video-frame video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

@media (max-width: 900px) {
  .page-shell {
    width: min(100% - 24px, 1120px);
    padding: 24px 0 40px;
  }

  .hero-panel,
  .intro-card,
  .video-card {
    border-radius: 22px;
  }

  .hero-panel {
    padding: 28px 22px;
  }

  .content-grid {
    gap: 18px;
  }

  .intro-card {
    padding: 28px 22px;
  }

  .video-card {
    padding: 18px;
  }

  .intro-topbar {
    flex-direction: column;
    align-items: stretch;
    margin-bottom: 14px;
  }

  .lang-toggle {
    align-self: flex-start;
  }
}