:root {
  --bg: #f6f5f1;
  --panel: #ffffff;
  --ink: #1c1d1f;
  --muted: #5d6066;
  --line: #d9d7cf;
  --accent: #1f6f5c;
  --accent-ink: #ffffff;
  --warn-bg: #fbeeea;
  --warn-ink: #8a2f1c;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121416;
    --panel: #1a1d20;
    --ink: #e7e5df;
    --muted: #9a9ea5;
    --line: #2d3136;
    --accent: #5cc4a6;
    --accent-ink: #0b1714;
    --warn-bg: #2a1915;
    --warn-ink: #f2a48f;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 var(--sans);
}

main {
  max-width: 52rem;
  margin: 0 auto;
  padding: 3rem 1rem 4rem;
}

.mark {
  margin: 0 0 1.5rem;
  font: 600 0.85rem var(--mono);
  letter-spacing: 0.08em;
  color: var(--accent);
}
.mark::before { content: "▍"; margin-right: 0.35rem; }

h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h2 { margin: 0; font-size: 1rem; }

.lede { margin: 0 0 2.25rem; max-width: 38rem; color: var(--muted); }

.drops {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1rem;
}

.drop {
  position: relative;
  display: grid;
  gap: 0.25rem;
  padding: 1.25rem 1.25rem 1.4rem;
  background: var(--panel);
  border: 1.5px dashed var(--line);
  border-radius: 10px;
  cursor: pointer;
  transition: border-color 120ms, background 120ms;
}
.drop:hover, .drop.over { border-color: var(--accent); }
.drop:focus-within { outline: 2px solid var(--accent); outline-offset: 2px; }
.drop.filled { border-style: solid; }

.drop input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.step {
  font: 600 0.75rem var(--mono);
  color: var(--muted);
}
.drop-title { font-weight: 600; }
.drop-file {
  font: 0.9rem var(--mono);
  color: var(--muted);
  overflow-wrap: anywhere;
}
.drop.filled .drop-file { color: var(--ink); }
.drop.filled .drop-file::before { content: "✓ "; color: var(--accent); }

.confirm {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
}
.confirm input { margin-top: 0.3rem; accent-color: var(--accent); width: 1.05rem; height: 1.05rem; }
.confirm small { display: block; color: var(--muted); }

.actions { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; }
#status { margin: 0; color: var(--muted); font-size: 0.9rem; }

button {
  font: 600 0.95rem var(--sans);
  padding: 0.65rem 1.4rem;
  border-radius: 8px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
  cursor: pointer;
}
button:disabled { opacity: 0.4; cursor: not-allowed; }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button.secondary {
  padding: 0.4rem 0.9rem;
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
  font-size: 0.85rem;
}
button.secondary:hover { border-color: var(--accent); }

#result, #error { margin-top: 2.5rem; }

.result-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}
.result-actions { display: flex; gap: 0.5rem; }

#report {
  margin: 0;
  max-height: 70vh;
  overflow: auto;
  padding: 1.25rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  font: 0.85rem/1.6 var(--mono);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

#error {
  padding: 1rem 1.25rem;
  background: var(--warn-bg);
  color: var(--warn-ink);
  border-radius: 10px;
}
#error p { margin: 0.35rem 0 0; }

footer {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  font-size: 0.875rem;
  color: var(--muted);
}
footer a { color: var(--accent); }

[hidden] { display: none !important; }