:root {
  --bg: #f7f7fb;
  --surface: #ffffff;
  --surface-2: #f1f1f7;
  --text: #1c1c28;
  --muted: #5d5d72;
  --border: #dcdce6;
  --accent: #5b5bd6;
  --accent-hover: #4b4bc4;
  --accent-text: #ffffff;
  --accent-soft: #ececfd;
  --success: #1f7a4d;
  --success-soft: #e5f5ec;
  --danger: #b42318;
  --danger-soft: #fdecea;
  --focus: #5b5bd6;
  --shadow: 0 1px 2px rgb(16 16 40 / 0.06), 0 4px 16px rgb(16 16 40 / 0.06);
  --radius: 14px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111118;
    --surface: #1a1a24;
    --surface-2: #22222e;
    --text: #ececf4;
    --muted: #a3a3b8;
    --border: #33333f;
    --accent: #8b8bf5;
    --accent-hover: #a2a2f8;
    --accent-text: #111118;
    --accent-soft: #26264a;
    --success: #6fd3a0;
    --success-soft: #16301f;
    --danger: #ff8f84;
    --danger-soft: #3a1714;
    --focus: #a2a2f8;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.3), 0 4px 16px rgb(0 0 0 / 0.25);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #111118;
  --surface: #1a1a24;
  --surface-2: #22222e;
  --text: #ececf4;
  --muted: #a3a3b8;
  --border: #33333f;
  --accent: #8b8bf5;
  --accent-hover: #a2a2f8;
  --accent-text: #111118;
  --accent-soft: #26264a;
  --success: #6fd3a0;
  --success-soft: #16301f;
  --danger: #ff8f84;
  --danger-soft: #3a1714;
  --focus: #a2a2f8;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.3), 0 4px 16px rgb(0 0 0 / 0.25);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }

[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

code, pre { font-family: var(--mono); }
code { font-size: 0.9em; }

a { color: var(--accent); }
a:hover { color: var(--accent-hover); }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: 6px;
}

.wrap {
  width: 100%;
  max-width: 920px;
  margin: 0 auto;
  padding: 0 16px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -48px;
  padding: 8px 12px;
  background: var(--surface);
  color: var(--text);
  border-radius: 8px;
  z-index: 10;
}
.skip-link:focus { top: 12px; }

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.logo {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-text);
  font: 700 14px/1 var(--mono);
}
.brand-name { font-size: 1.1rem; letter-spacing: -0.01em; }
.header-actions { display: flex; align-items: center; gap: 16px; }
.theme-switch {
  display: inline-flex;
  padding: 3px;
  gap: 2px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-2);
}
.theme-switch label {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
}
.theme-switch input {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}
.theme-switch label:hover { color: var(--text); }
.theme-switch label:has(input:checked) {
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 1px 2px rgb(16 16 40 / 0.12);
}
.theme-switch label:has(input:focus-visible) {
  outline: 3px solid var(--focus);
  outline-offset: 1px;
}
.header-link { font-weight: 500; text-decoration: none; }
.header-link:hover { text-decoration: underline; }

main.wrap { flex: 1; padding-top: 40px; padding-bottom: 48px; }

.intro h1 {
  margin: 0 0 8px;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.lede { margin: 0 0 16px; color: var(--muted); max-width: 62ch; }

.privacy {
  display: inline-flex;
  align-items: flex-start;
  gap: 8px;
  margin: 0 0 24px;
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--success-soft);
  color: var(--success);
  font-size: 0.95rem;
}
.privacy svg { flex: none; margin-top: 2px; }
.privacy span { color: var(--text); }
.privacy strong { color: var(--success); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 20px;
}

.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 36px 16px;
  border: 2px dashed var(--border);
  border-radius: 12px;
  background: var(--surface-2);
  transition: border-color 0.15s, background-color 0.15s;
}
.dropzone.dragover {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.drop-icon { color: var(--accent); margin-bottom: 8px; }
.drop-title { margin: 0; font-weight: 600; font-size: 1.05rem; }
.drop-or { margin: 4px 0 10px; color: var(--muted); font-size: 0.9rem; }
.hint { margin: 14px 0 0; color: var(--muted); font-size: 0.9rem; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 40px;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s;
}
.button:hover { background: var(--surface-2); }
.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-text);
}
.button.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.button:disabled { opacity: 0.55; cursor: progress; }
#file-input:focus-visible + .button { outline: 3px solid var(--focus); outline-offset: 2px; }

.options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
  border: 0;
}
.options legend {
  padding: 0;
  margin-bottom: 10px;
  font-weight: 700;
}
.option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
}
.option:hover { background: var(--surface-2); }
.option input { margin: 3px 0 0; width: 18px; height: 18px; accent-color: var(--accent); flex: none; }
.option-name { display: block; font-weight: 600; }
.option-help { display: block; color: var(--muted); font-size: 0.85rem; }

.status {
  margin-bottom: 20px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}
.status-row { display: flex; justify-content: space-between; gap: 12px; margin-bottom: 10px; font-weight: 500; }
.progress {
  position: relative;
  height: 6px;
  border-radius: 3px;
  background: var(--surface-2);
  overflow: hidden;
}
.progress span {
  position: absolute;
  inset: 0 auto 0 0;
  width: 35%;
  border-radius: 3px;
  background: var(--accent);
  animation: indeterminate 1.2s ease-in-out infinite;
}
.progress.done span { width: 100%; animation: none; background: var(--success); }
@keyframes indeterminate {
  from { left: -35%; }
  to { left: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  .progress span { animation: none; width: 100%; opacity: 0.6; }
}

.error {
  margin-bottom: 20px;
  padding: 14px 16px;
  border: 1px solid var(--danger);
  border-radius: 12px;
  background: var(--danger-soft);
  color: var(--danger);
  overflow-wrap: anywhere;
}
.error span { color: var(--text); }

.result-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}
.result h2 { margin: 0; font-size: 1.25rem; overflow-wrap: anywhere; }
.result h3 { margin: 0; font-size: 1rem; }
#result-summary { margin: 4px 0 0; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; }

.muted { color: var(--muted); }
.small { font-size: 0.875rem; }

.preview-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin: 16px 0 8px;
}
.preview {
  margin: 0;
  max-height: 480px;
  overflow: auto;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-2);
  font-size: 0.82rem;
  line-height: 1.5;
  tab-size: 2;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.875rem;
}
.site-footer p { margin: 16px 0; }

@media (max-width: 560px) {
  .theme-switch span { display: none; }
  .theme-switch label { padding: 6px 8px; }
  .header-actions { gap: 12px; }
  .card { padding: 16px; }
  .actions { width: 100%; }
  .actions .button { flex: 1 1 calc(50% - 8px); }
}