:root {
  --bg: #0b0f14;
  --card: rgba(255, 255, 255, 0.06);
  --card-border: rgba(255, 255, 255, 0.10);
  --text: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.72);
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  --green: #22c55e;
  --green-dark: #16a34a;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f7fb;
    --card: rgba(0, 0, 0, 0.035);
    --card-border: rgba(0, 0, 0, 0.10);
    --text: rgba(0, 0, 0, 0.92);
    --muted: rgba(0, 0, 0, 0.68);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.10);
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--text);
}

.hidden { display: none !important; }

#app { height: 100%; }

.landing {
  height: 100%;
  display: grid;
  place-items: center;
}

.upload-btn {
  font-size: 22px;
  font-weight: 700;
  padding: 18px 34px;
  border-radius: 16px;
  border: 1px solid rgba(0,0,0,0.12);
  background: linear-gradient(180deg, var(--green), var(--green-dark));
  color: white;
  cursor: pointer;
  box-shadow: var(--shadow);
}
.upload-btn:active { transform: translateY(1px); }
.upload-btn:focus-visible { outline: 3px solid rgba(34,197,94,0.35); outline-offset: 3px; }

.viewer {
  height: 100%;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 12px;
  padding: 14px;
}

.toolbar {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.btn {
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--card-border);
  background: var(--card);
  color: var(--text);
  cursor: pointer;
}
.btn:disabled { opacity: 0.55; cursor: not-allowed; }
.btn-primary {
  border-color: rgba(34,197,94,0.35);
  background: rgba(34,197,94,0.18);
}
.btn:focus-visible { outline: 3px solid rgba(34,197,94,0.22); outline-offset: 3px; }

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  min-height: 0;
}

.pane {
  border: 1px solid var(--card-border);
  background: var(--card);
  border-radius: 14px;
  box-shadow: var(--shadow);
  overflow: hidden;
  min-height: 0;
  display: grid;
  grid-template-rows: auto 1fr;
}

.pane-title {
  padding: 10px 12px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--muted);
  border-bottom: 1px solid var(--card-border);
}

.pane-body {
  min-height: 0;
  position: relative;
}

.scroll { overflow: auto; }

.status {
  padding: 14px;
  color: var(--muted);
  font-size: 14px;
}

.doc-frame {
  width: 100%;
  height: 100%;
  border: 0;
  background: white;
}

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

@media (max-width: 900px) {
  .split { grid-template-columns: 1fr; }
}