:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #15181d;
  --muted: #5d6673;
  --line: #dfe3e8;
  --accent: #1f6feb;
  --accent-text: #ffffff;
  --accent-soft: #e7f0ff;
  --warn-bg: #fff4e0;
  --warn-line: #f0b44c;
  --ok: #1a7f37;
  --danger: #c62828;
  --radius: 14px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1116;
    --card: #171b22;
    --text: #e8ebf0;
    --muted: #9aa4b2;
    --line: #2a313c;
    --accent: #4c8dff;
    --accent-text: #0b0e13;
    --accent-soft: #16233a;
    --warn-bg: #2b2111;
    --warn-line: #a8792b;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0e1116;
  --card: #171b22;
  --text: #e8ebf0;
  --muted: #9aa4b2;
  --line: #2a313c;
  --accent: #4c8dff;
  --accent-text: #0b0e13;
  --accent-soft: #16233a;
  --warn-bg: #2b2111;
  --warn-line: #a8792b;
  color-scheme: dark;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  padding: env(safe-area-inset-top) 0 env(safe-area-inset-bottom);
}

main, .top, .foot {
  max-width: 560px;
  margin: 0 auto;
  padding-left: 16px;
  padding-right: 16px;
}

.top {
  display: flex;
  gap: 12px;
  align-items: center;
  padding-top: 18px;
  padding-bottom: 8px;
}
.top img { border-radius: 10px; flex: none; }
h1 { font-size: 1.35rem; margin: 0; line-height: 1.2; }
.sub { margin: 2px 0 0; color: var(--muted); font-size: 0.9rem; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  margin: 14px 0;
}

h2 { font-size: 1.05rem; margin: 4px 0 6px; display: flex; align-items: center; gap: 8px; }
.card h2 + .hint { margin-top: 0; }
.card h2:not(:first-child) { margin-top: 18px; }

.num {
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-text);
  font-size: 0.85rem;
  flex: none;
}

.hint { color: var(--muted); font-size: 0.9rem; margin: 6px 0; }
.center { text-align: center; }

.picker { display: block; position: relative; }
.picker input { position: absolute; inset: 0; opacity: 0; width: 100%; height: 100%; cursor: pointer; }
.picker-btn {
  display: block;
  text-align: center;
  padding: 14px;
  border: 2px dashed var(--accent);
  border-radius: 12px;
  color: var(--accent);
  font-weight: 600;
  background: var(--accent-soft);
}
.picker input:focus-visible + .picker-btn { outline: 3px solid var(--accent); outline-offset: 2px; }
.picker-name {
  display: block;
  margin-top: 6px;
  font-size: 0.88rem;
  color: var(--muted);
  overflow-wrap: anywhere;
}
.picker.chosen .picker-btn { border-style: solid; }
.picker.chosen .picker-name { color: var(--ok); font-weight: 600; }

.thumb {
  display: block;
  width: 100%;
  max-height: 180px;
  object-fit: contain;
  background: #000;
  border-radius: 10px;
  margin-top: 8px;
}

.seg { border: 0; padding: 0; margin: 8px 0 0; display: flex; flex-wrap: wrap; gap: 6px; }
.seg legend { font-weight: 600; margin-bottom: 6px; padding: 0; width: 100%; }
.seg label { flex: 1 1 0; min-width: 64px; }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg span {
  display: block;
  text-align: center;
  padding: 10px 6px;
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
  user-select: none;
}
.seg input:checked + span { background: var(--accent); color: var(--accent-text); border-color: var(--accent); font-weight: 600; }
.seg input:focus-visible + span { outline: 3px solid var(--accent); outline-offset: 2px; }

button {
  font: inherit;
  border-radius: 12px;
  border: 1px solid transparent;
  padding: 12px 16px;
  cursor: pointer;
  width: 100%;
  margin-top: 10px;
}
button:disabled { opacity: 0.45; cursor: not-allowed; }
.primary { background: var(--accent); color: var(--accent-text); font-weight: 700; }
.secondary { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.ghost { background: transparent; color: var(--muted); border-color: var(--line); }
.big { padding: 16px; font-size: 1.1rem; }

.bar { height: 12px; background: var(--line); border-radius: 99px; overflow: hidden; margin-top: 10px; }
.bar > div { height: 100%; width: 0; background: var(--accent); transition: width 0.3s ease; }
.bar.indeterminate > div { width: 35%; animation: slide 1.2s ease-in-out infinite; }
@keyframes slide { from { transform: translateX(-100%); } to { transform: translateX(300%); } }
.progress-line { display: flex; justify-content: space-between; font-variant-numeric: tabular-nums; margin: 6px 0; font-weight: 600; }

.result { display: block; width: 100%; max-height: 60vh; background: #000; border-radius: 10px; }

.banner { border-radius: 12px; padding: 12px 14px; margin: 12px 0; font-size: 0.92rem; }
.banner.warn { background: var(--warn-bg); border: 1px solid var(--warn-line); }
.banner.info { background: var(--accent-soft); border: 1px solid var(--line); }
.banner a { color: var(--accent); font-weight: 600; }

#errorMsg { color: var(--danger); font-weight: 600; }
pre { white-space: pre-wrap; overflow-wrap: anywhere; font-size: 0.75rem; max-height: 240px; overflow: auto; background: var(--bg); padding: 8px; border-radius: 8px; }

.guide { margin: 22px 0 10px; }
.guide > summary.guide-title { font-size: 1.1rem; padding: 15px 0; }
.guide-hint { font-weight: 400; color: var(--muted); font-size: 0.85rem; margin-left: 4px; }
.guide[open] > summary .guide-hint { display: none; }
.guide details { background: var(--bg); }

.inapp { font-size: 0.95rem; }
.inapp p { margin: 6px 0; }
.inapp button { margin-top: 8px; }
.os-android-inline, .os-ios-inline { display: none; }
.is-android .os-android-inline, .is-ios .os-ios-inline { display: inline; }
.tabs { display: flex; gap: 6px; margin: 10px 0; }
.tabs button { margin: 0; background: var(--card); border-color: var(--line); color: var(--text); }
.tabs button[aria-selected="true"] { background: var(--accent); color: var(--accent-text); border-color: var(--accent); font-weight: 600; }

details {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  margin: 8px 0;
  padding: 0 14px;
}
details[open] { padding-bottom: 8px; }
summary { cursor: pointer; font-weight: 600; padding: 13px 0; list-style-position: inside; }
details ol, details ul { padding-left: 20px; margin: 4px 0 8px; }
details li { margin: 6px 0; }
code { font-size: 0.85em; overflow-wrap: anywhere; }

.foot { color: var(--muted); font-size: 0.8rem; text-align: center; padding-top: 10px; padding-bottom: 28px; }
.foot a { color: inherit; }

[hidden] { display: none !important; }