:root {
  --color-bg: #fafaf8;
  --color-surface: #ffffff;
  --color-ink: #16181d;
  --color-muted: #6b7280;
  --color-border: #e7e5e0;
  --color-accent: #d4a853;
  --color-accent-dark: #b8903f;
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --radius: 14px;
  --shadow-card: 0 12px 40px rgba(20, 20, 20, 0.10);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  min-height: 100vh;
}

body {
  display: flex;
  flex-direction: column;
}

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

/* Topbar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(250, 250, 248, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.topbar__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-width: 0;
}
.brand__logo {
  height: 28px;
  width: auto;
  flex-shrink: 0;
}
.brand__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-ink);
  color: #fff;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.6rem 1.1rem;
  border-radius: 999px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background 0.18s ease, transform 0.18s ease;
  white-space: nowrap;
}
.btn-download:hover {
  background: var(--color-accent-dark);
  transform: translateY(-1px);
}
.btn-download--footer {
  background: var(--color-accent);
  color: var(--color-ink);
  font-size: 0.95rem;
  padding: 0.85rem 1.6rem;
}
.btn-download--footer:hover {
  background: var(--color-accent-dark);
  color: #fff;
}

/* Viewer */
.viewer {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.5rem 1rem 1rem;
  gap: 1rem;
}

.stage {
  width: 100%;
  max-width: 1100px;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.stage__frame {
  flex: 1;
  min-width: 0;
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
  overflow: hidden;
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
}

.stage__img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #fff;
}

.nav-btn {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-ink);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(0,0,0,0.06);
  transition: background 0.15s ease, transform 0.15s ease;
}
.nav-btn:hover {
  background: var(--color-accent);
  transform: scale(1.06);
}
.nav-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none;
}

.counter {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-muted);
  letter-spacing: 0.02em;
}

.dots {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem;
  max-width: 700px;
  padding: 0 1rem;
}
.dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--color-border);
  border: none;
  cursor: pointer;
  padding: 0;
  transition: background 0.15s ease, transform 0.15s ease;
}
.dot:hover { transform: scale(1.3); }
.dot.is-active {
  background: var(--color-accent-dark);
  transform: scale(1.3);
}

.foot {
  display: flex;
  justify-content: center;
  padding: 1.5rem 1rem 3rem;
}

@media (max-width: 640px) {
  .brand__name { font-size: 0.8rem; }
  .btn-download { padding: 0.5rem 0.85rem; font-size: 0.78rem; }
  .nav-btn { width: 36px; height: 36px; }
  .stage { gap: 0.4rem; }
}