:root {
  color-scheme: light dark;

  --bg: #fafafa;
  --card: #ffffff;
  --text: #151515;
  --muted: #666666;
  --line: #e7e7e7;
  --primary: #111111;
  --primary-text: #ffffff;
  --soft: #f3f3f3;
  --danger: #b00020;
  --success: #126b2f;
  --shadow: rgba(0, 0, 0, 0.045);
  --focus: rgba(0, 0, 0, 0.06);
  --radius: 18px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101010;
    --card: #171717;
    --text: #f4f4f4;
    --muted: #a5a5a5;
    --line: #2a2a2a;
    --primary: #f4f4f4;
    --primary-text: #111111;
    --soft: #222222;
    --danger: #ff6b7a;
    --success: #65d287;
    --shadow: rgba(0, 0, 0, 0.35);
    --focus: rgba(255, 255, 255, 0.10);
  }
}

html[data-theme="light"] {
  color-scheme: light;

  --bg: #fafafa;
  --card: #ffffff;
  --text: #151515;
  --muted: #666666;
  --line: #e7e7e7;
  --primary: #111111;
  --primary-text: #ffffff;
  --soft: #f3f3f3;
  --danger: #b00020;
  --success: #126b2f;
  --shadow: rgba(0, 0, 0, 0.045);
  --focus: rgba(0, 0, 0, 0.06);
}

html[data-theme="dark"] {
  color-scheme: dark;

  --bg: #101010;
  --card: #171717;
  --text: #f4f4f4;
  --muted: #a5a5a5;
  --line: #2a2a2a;
  --primary: #f4f4f4;
  --primary-text: #111111;
  --soft: #222222;
  --danger: #ff6b7a;
  --success: #65d287;
  --shadow: rgba(0, 0, 0, 0.35);
  --focus: rgba(255, 255, 255, 0.10);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  min-height: 100%;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top, var(--soft), transparent 34rem),
    var(--bg);
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  line-height: 1.5;
  transition: background 160ms ease, color 160ms ease;
}

main {
  width: min(100% - 32px, 560px);
  margin: 48px auto;
}

.topbar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 22px;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 0.86rem;
  user-select: none;
}

.switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 28px;
  flex: 0 0 auto;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: 160ms ease;
}

.slider::before {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  left: 3px;
  top: 3px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  box-shadow: 0 3px 10px var(--shadow);
  transition: 160ms ease;
}

.switch input:checked + .slider::before {
  transform: translateX(20px);
}

.hero {
  text-align: center;
  margin-bottom: 24px;
}

h1 {
  font-size: clamp(2rem, 7vw, 3.4rem);
  line-height: 1;
  letter-spacing: -0.06em;
  margin: 0 0 12px;
  font-weight: 800;
}

.subtitle {
  margin: 0 auto;
  max-width: 420px;
  color: var(--muted);
  font-size: 0.98rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: 0 14px 50px var(--shadow);
  transition: background 160ms ease, border-color 160ms ease;
}

.tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 6px;
  border-radius: 999px;
  background: var(--soft);
  margin-bottom: 18px;
}

.tabs label {
  cursor: pointer;
  text-align: center;
  padding: 10px 12px;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 650;
  user-select: none;
  transition: 160ms ease;
}

input[name="tab"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

#tab-extract:checked ~ .card .tabs label[for="tab-extract"],
#tab-create:checked ~ .card .tabs label[for="tab-create"] {
  background: var(--card);
  color: var(--text);
  box-shadow: 0 4px 18px var(--shadow);
}

.panel {
  display: none;
}

#tab-extract:checked ~ .card #extractPanel,
#tab-create:checked ~ .card #createPanel {
  display: block;
}

h2 {
  font-size: 1.1rem;
  margin: 4px 0 4px;
  letter-spacing: -0.03em;
}

.hint {
  color: var(--muted);
  font-size: 0.92rem;
  margin: 0 0 18px;
}

label.field {
  display: block;
  margin: 14px 0;
}

.field span {
  display: block;
  font-size: 0.86rem;
  color: var(--muted);
  margin-bottom: 6px;
}

input,
select,
button {
  width: 100%;
  border-radius: 12px;
  padding: 12px 13px;
  font: inherit;
}

input,
select {
  background: var(--card);
  border: 1px solid var(--line);
  color: var(--text);
}

input:focus,
select:focus {
  border-color: var(--muted);
  outline: 3px solid var(--focus);
}

button {
  border: 0;
  background: var(--primary);
  color: var(--primary-text);
  cursor: pointer;
  font-weight: 750;
  margin-top: 10px;
  transition: transform 120ms ease, opacity 120ms ease;
}

button:hover {
  opacity: 0.88;
}

button:active {
  transform: translateY(1px);
}

.status {
  margin-top: 14px;
  font-size: 0.95rem;
}

.error {
  color: var(--danger);
  margin: 0;
}

.success {
  color: var(--success);
  margin: 0 0 10px;
}

.selected-title {
  margin: 20px 0 8px;
  font-size: 0.95rem;
}

ul {
  padding-left: 18px;
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.file {
  margin-top: 18px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.file h3 {
  margin: 0 0 8px;
  font-size: 0.98rem;
}

pre {
  margin: 0;
  background: var(--soft);
  border: 1px solid var(--line);
  padding: 12px;
  border-radius: 12px;
  overflow: auto;
  white-space: pre-wrap;
  font-size: 0.9rem;
  color: var(--text);
}

a.download-link {
  display: block;
  text-align: center;
  margin-top: 10px;
  padding: 12px 13px;
  border-radius: 12px;
  border: 1px solid var(--line);
  color: var(--text);
  text-decoration: none;
  font-weight: 750;
  background: var(--soft);
}

footer {
  text-align: center;
  margin-top: 20px;
  color: var(--muted);
  font-size: 0.82rem;
}