*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --border: #334155;
  --accent: #3B82F6;
  --accent-hover: #2563eb;
  --text: #f1f5f9;
  --muted: #94a3b8;
}

body {
  background: var(--bg);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: var(--text);
  line-height: 1.6;
}

main {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ── Hero ── */

.hero {
  display: flex;
  justify-content: center;
  padding: 5rem 1.5rem 4rem;
}

.hero-inner {
  text-align: center;
  max-width: 600px;
  width: 100%;
}

.icon {
  width: 96px;
  height: 96px;
  border-radius: 22px;
  margin-bottom: 1.5rem;
  box-shadow: 0 8px 32px rgba(59, 130, 246, 0.25);
}

h1 {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -1px;
  color: var(--text);
  margin-bottom: 0.75rem;
}

.tagline {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 1.5rem;
}

.description-wrap {
  margin-bottom: 2.5rem;
  text-align: left;
}

.description {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.description.expanded {
  display: block;
  overflow: visible;
}

.toggle-btn {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.4rem 0;
  margin-top: 0.5rem;
  display: inline-block;
  transition: color 0.2s;
}

.toggle-btn:hover {
  color: var(--accent-hover);
}

.btn-play {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-size: 1rem;
  font-weight: 600;
  padding: 0.9rem 2.25rem;
  border-radius: 50px;
  transition: background 0.2s, transform 0.2s;
}

.btn-play:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
}

.btn-play svg {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}

.hero-graphic {
  display: block;
  width: 100%;
  max-width: 480px;
  margin: 2.5rem auto 0;
  border-radius: 16px;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.5);
}

/* ── Section shared ── */

.section-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 2rem;
  text-align: center;
}

/* ── Features ── */

.features {
  padding: 4rem 0;
  border-top: 1px solid var(--border);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.75rem 1.5rem;
  transition: border-color 0.2s, transform 0.2s;
}

.feature:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
  line-height: 1;
}

.feature h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.feature p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ── Screenshots ── */

.screenshots {
  padding: 4rem 0;
  border-top: 1px solid var(--border);
  overflow: hidden;
}

.screenshots-track {
  display: flex;
  gap: 1.25rem;
  overflow-x: auto;
  padding: 0.5rem 2rem 2rem;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
  justify-content: safe center;
}

.screenshots-track::-webkit-scrollbar {
  height: 6px;
}

.screenshots-track::-webkit-scrollbar-track {
  background: transparent;
}

.screenshots-track::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

.phone {
  flex-shrink: 0;
  scroll-snap-align: start;
  width: 200px;
  height: 400px;
  border-radius: 28px;
  border: 2px solid var(--border);
  overflow: hidden;
  background: linear-gradient(160deg, #1e293b 0%, #0f172a 100%);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.5);
  transition: transform 0.2s;
}

.phone:hover {
  transform: translateY(-4px);
}

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

/* ── Footer ── */

footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.875rem;
}

/* ── Lang Switcher ── */

.lang-switcher {
  margin: 1rem;
  position: relative;
  display: flex;
  justify-content: flex-end;
}

.lang-switcher button {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  padding: 0.5rem 0.75rem;
  transition: background 0.2s;
}

.lang-switcher button:hover {
  background: var(--border);
}

#lang-current {
  font-size: 1.5rem;
  line-height: 1;
}

.lang-arrow {
  width: 12px;
  height: 12px;
  opacity: 0.5;
}

#lang-options {
  list-style: none;
  margin: 0.25rem 0 0;
  padding: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  position: absolute;
  right: 0;
  top: 100%;
  z-index: 200;
}

#lang-options li {
  padding: 0.75rem 1rem;
  cursor: pointer;
  font-size: 1.5rem;
  text-align: center;
  transition: background 0.2s;
}

#lang-options li:hover {
  background: var(--border);
}

#lang-options li[aria-selected="true"] {
  background: var(--accent);
}

#lang-options li[aria-selected="true"]:hover {
  background: var(--accent-hover);
}

/* ── Responsive ── */

@media (max-width: 600px) {
  h1 {
    font-size: 2rem;
  }

  .hero {
    padding: 3rem 1.25rem 2.5rem;
  }

  .section-title {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
  }

  .features {
    padding: 3rem 0;
  }

  .feature {
    padding: 1.25rem 1.1rem;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .screenshots {
    padding: 3rem 0;
  }

  .screenshots-track {
    flex-wrap: wrap;
    overflow-x: visible;
    padding: 0.5rem 1.25rem 1.5rem;
    gap: 1rem;
    justify-content: center;
  }

  .phone {
    width: 155px;
    height: 310px;
    border-radius: 22px;
    scroll-snap-align: none;
  }

  .hero-graphic {
    border-radius: 12px;
    margin-top: 2rem;
  }
}