:root {
  --accent: #00a3e5;
  --accent-strong: #0086c4;
  --accent-ink: #036e98;
  --accent-soft: #e5f5fc;
  --bg: #fafaf8;
  --card: #ffffff;
  --text: #003a48;
  --muted: #5a635e;
  --faint: #68706a;
  --border: rgba(0, 58, 72, 0.12);
  --radius: 16px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.top {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  align-items: center;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
}

.brand-mark { display: flex; }

.brand-mark img {
  display: block;
  border-radius: 8px;
}

main { max-width: 960px; margin: 0 auto; padding: 0 24px 48px; }

.hero {
  text-align: center;
  padding: 40px 0 48px;
}

.app-icon {
  display: inline-flex;
  margin-bottom: 20px;
}

.app-icon img {
  display: block;
  border-radius: 24px;
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.22);
}

h1 {
  margin: 0;
  font-size: 34px;
  letter-spacing: -0.5px;
}

.tagline {
  margin: 6px 0 14px;
  font-size: 17px;
  color: var(--accent-ink);
  font-weight: 600;
}

.description {
  max-width: 560px;
  margin: 0 auto 28px;
  color: var(--muted);
  font-size: 15.5px;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #fff;
  border: none;
  border-radius: 999px;
  padding: 15px 44px;
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  box-shadow: 0 10px 24px rgba(0, 163, 229, 0.35);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(0, 163, 229, 0.42);
}

.download-btn:active { transform: translateY(0); }

.download-btn:disabled {
  background: #cbd5e1;
  box-shadow: none;
  cursor: not-allowed;
}

.meta-line {
  margin: 14px 0 0;
  color: var(--faint);
  font-size: 14px;
}

.screens { padding: 8px 0 32px; }

.screens h2 {
  font-size: 22px;
  margin: 0 0 18px;
}

.screens-strip {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  padding: 6px 4px 14px;
  scroll-snap-type: x mandatory;
}

.screens-strip figure {
  margin: 0;
  flex: 0 0 auto;
  scroll-snap-align: center;
  text-align: center;
}

.phone {
  width: 190px;
  border-radius: 24px;
  border: 1px solid var(--border);
  overflow: hidden;
  background: #fff;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
}

.phone img { display: block; width: 100%; height: auto; }

.screens-strip figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--muted);
}

.video {
  padding: 8px 0 24px;
  text-align: center;
}

.video h2 {
  font-size: 22px;
  margin: 0 0 18px;
}

.video-frame {
  max-width: 420px;
  margin: 0 auto;
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
}

.video-frame video {
  display: block;
  width: 100%;
  height: auto;
  background: #003a48;
}

.video-download-link {
  margin-top: 14px;
  background: none;
  border: none;
  padding: 4px 8px;
  font-size: 14px;
  color: var(--accent-ink);
  cursor: pointer;
}

.video-download-link:hover { text-decoration: underline; }

.footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--faint);
  font-size: 13px;
  border-top: 1px solid var(--border);
}

.archive-link {
  background: none;
  border: none;
  padding: 4px;
  font-size: 12px;
  color: var(--faint);
  cursor: pointer;
}

.archive-link:hover {
  color: var(--muted);
  text-decoration: underline;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(2px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 50;
}

.modal-backdrop.hidden { display: none; }

.modal {
  position: relative;
  background: #fff;
  border-radius: 20px;
  padding: 32px 28px 26px;
  max-width: 400px;
  width: 100%;
  text-align: center;
  box-shadow: 0 24px 64px rgba(15, 23, 42, 0.25);
  animation: rise 0.18s ease;
}

.modal-wide { max-width: 480px; text-align: left; }

@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

.modal h2 { margin: 12px 0 4px; font-size: 21px; }

.modal-icon { display: flex; justify-content: center; }

.modal-icon img {
  display: block;
  border-radius: 14px;
}

.modal-version {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 14px;
}

.modal-notes {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  font-size: 14px;
  color: var(--muted);
}

.modal-notes li { padding: 3px 0; }

.modal-download { width: 100%; }

.modal-size {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--faint);
}

.modal-hint {
  margin: 14px 0 0;
  font-size: 12.5px;
  color: var(--faint);
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 14px;
  background: none;
  border: none;
  font-size: 16px;
  color: var(--faint);
  cursor: pointer;
  padding: 6px;
}

.modal-close:hover { color: var(--text); }

.version-list { margin-top: 16px; max-height: 55vh; overflow-y: auto; }

.version-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 2px;
  border-bottom: 1px solid var(--border);
}

.version-row:last-child { border-bottom: none; }

.version-info { min-width: 0; }

.version-num { font-weight: 700; font-size: 15px; }

.badge {
  display: inline-block;
  margin-left: 8px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-size: 11px;
  font-weight: 700;
  vertical-align: 1px;
}

.version-sub {
  margin: 2px 0 0;
  font-size: 12.5px;
  color: var(--faint);
}

.version-get {
  flex: 0 0 auto;
  background: none;
  border: 1px solid var(--accent);
  color: var(--accent-ink);
  border-radius: 999px;
  padding: 7px 16px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.version-get:hover { background: var(--accent-soft); }

@media (max-width: 560px) {
  h1 { font-size: 28px; }
  .hero { padding-top: 24px; }
  .footer { flex-direction: column; gap: 8px; }
}