:root {
  --panel-soft: rgba(16, 16, 20, 0.96);
  --line: rgba(255, 255, 255, 0.08);
  --ink: #f3f5f7;
  --muted: #99a3b2;
  --accent: #6cf5ca;
  --accent-strong: #09c29a;
  --shadow: 0 22px 60px rgba(0, 0, 0, 0.48);
  --viewer-height: 100dvh;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
}

html {
  color-scheme: dark;
}

body {
  font-family: "SF Pro Display", "Avenir Next", "Helvetica Neue", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(108, 245, 202, 0.08), transparent 22%),
    radial-gradient(circle at top right, rgba(139, 157, 255, 0.08), transparent 22%),
    linear-gradient(180deg, #010101 0%, #060606 100%);
}

.viewer-shell {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  width: 100%;
  height: var(--viewer-height);
  padding:
    max(10px, env(safe-area-inset-top))
    max(10px, env(safe-area-inset-right))
    max(10px, env(safe-area-inset-bottom))
    max(10px, env(safe-area-inset-left));
  gap: 10px;
}

.viewer-topbar {
  display: grid;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 24px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(18, 18, 22, 0.98), rgba(10, 10, 13, 0.98));
  box-shadow: var(--shadow);
}

.viewer-topline,
.viewer-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.viewer-brand {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  color: var(--ink);
  text-decoration: none;
  font-family: "Oswald", "Arial Narrow", sans-serif;
  font-size: clamp(1.35rem, 2.1vw, 1.8rem);
  line-height: 1;
  letter-spacing: 0.05em;
  text-transform: lowercase;
}

.viewer-library-nav,
.viewer-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
}

.viewer-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
  color: var(--ink);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 700;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease, color 140ms ease;
}

.viewer-link:hover {
  transform: translateY(-1px);
  border-color: rgba(108, 245, 202, 0.22);
  background: rgba(108, 245, 202, 0.08);
  color: var(--accent);
}

.viewer-link.active {
  border-color: rgba(108, 245, 202, 0.22);
  background: rgba(108, 245, 202, 0.09);
  color: var(--accent);
}

.viewer-link.primary {
  color: #04110c;
  border-color: transparent;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
}

.viewer-title {
  min-width: 0;
}

.viewer-kicker {
  margin: 0 0 0.24rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.72rem;
  font-weight: 800;
}

.viewer-title h1 {
  margin: 0;
  font-size: clamp(1.12rem, 2.2vw, 1.52rem);
  letter-spacing: -0.03em;
}

.viewer-title p:last-child {
  margin: 0.34rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.viewer-stage {
  min-height: 0;
  padding: 8px;
  border-radius: 26px;
  border: 1px solid var(--line);
  background: var(--panel-soft);
  box-shadow: var(--shadow);
}

.viewer-document {
  width: 100%;
  height: 100%;
  min-height: 0;
}

.viewer-object {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  border-radius: 18px;
  background: #ffffff;
}

.viewer-embed,
.viewer-frame {
  width: 100%;
  height: 100%;
  border: 0;
  border-radius: 18px;
  background: #ffffff;
  display: block;
}

@media (max-width: 980px) {
  .viewer-topline,
  .viewer-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .viewer-library-nav,
  .viewer-actions {
    justify-content: stretch;
  }

  .viewer-link {
    flex: 1 1 0;
  }
}

@media (max-width: 640px) {
  .viewer-shell {
    gap: 8px;
    padding:
      max(6px, env(safe-area-inset-top))
      max(6px, env(safe-area-inset-right))
      max(6px, env(safe-area-inset-bottom))
      max(6px, env(safe-area-inset-left));
  }

  .viewer-topbar {
    padding: 10px;
    border-radius: 18px;
  }

  .viewer-stage {
    padding: 6px;
    border-radius: 18px;
  }

  .viewer-object,
  .viewer-embed,
  .viewer-frame {
    border-radius: 12px;
  }

  .viewer-library-nav,
  .viewer-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .viewer-brand {
    min-height: 34px;
    font-size: 1.28rem;
  }
}

@media (max-width: 420px) {
  .viewer-library-nav,
  .viewer-actions {
    grid-template-columns: 1fr;
  }
}