:root {
  --bg: #000;
  --surface: #0a0a0a;
  --surface-2: #111;
  --border: #1f1f1f;
  --border-strong: #2a2a2a;
  --text: #ededed;
  --text-dim: #8a8a8a;
  --text-faint: #555;
  --accent: #ededed;
  --accent-on: #000;
  --radius: 8px;
  --radius-sm: 6px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
          "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  --max-w: 640px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; color-scheme: dark; }

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection { background: var(--text); color: var(--bg); }

a { color: var(--text-dim); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--text); }

img { max-width: 100%; display: block; }

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #3a3a3a; }

.nav {
  position: sticky;
  top: 0;
  z-index: 99;
  display: flex;
  align-items: center;
  height: 48px;
  padding: 0 1.25rem;
  background: rgba(0, 0, 0, .8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav-brand {
  font-weight: 600;
  font-size: 13px;
  letter-spacing: .01em;
  color: var(--text);
}
.nav-brand .dot { color: var(--text-faint); margin: 0 .4em; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
  font-size: 13px;
}
.nav-links a {
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-dim);
}
.nav-links a:hover { color: var(--text); background: var(--surface); }
.nav-links a.active { color: var(--text); }

.nav-burger { display: none; }

.main {
  width: min(var(--max-w), 92vw);
  margin: 0 auto;
  padding: 2.5rem 0 4rem;
}

.page-head { margin-bottom: 2rem; }
.page-title {
  margin: 0 0 .35rem;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -.01em;
}
.page-sub {
  margin: 0;
  color: var(--text-faint);
  font-size: 13px;
}

.section + .section { margin-top: 1.5rem; }
.section-title {
  margin: 0 0 .6rem;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
}
.card + .card { margin-top: .75rem; }

.field { display: block; }
.field + .field { margin-top: .85rem; }
.field-label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: .35rem;
  font-size: 12px;
  color: var(--text-dim);
}
.field-label .hint { color: var(--text-faint); font-variant-numeric: tabular-nums; }

input[type="text"],
select,
textarea {
  width: 100%;
  padding: .55rem .7rem;
  font: inherit;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  outline: none;
  text-indent: 0;
  transition: border-color .15s ease;
}
textarea {
  resize: vertical;
  min-height: 7rem;
  font-family: var(--font);
  line-height: 1.6;
}
input:focus,
select:focus,
textarea:focus { border-color: var(--text-faint); }

::placeholder { color: var(--text-faint); }

select {
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  padding-right: 2rem;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238a8a8a' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right .65rem center;
  background-size: 14px;
}
select option { background: var(--bg); color: var(--text); }

.no-border {
  background: transparent;
  border: none;
  padding: .55rem .85rem;
  font-size: 13px;
  border-radius: 0;
  margin: 0;
}
.no-border:focus { border-color: transparent; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: .75rem;
}

.actions {
  display: flex;
  gap: .5rem;
  margin-top: 1rem;
}

.btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .35rem;
  padding: .55rem 1rem;
  font: inherit;
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all .15s ease;
}
.btn:hover { border-color: var(--border-strong); background: #161616; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.primary {
  background: var(--accent);
  color: var(--accent-on);
  border-color: var(--accent);
  font-weight: 600;
}
.btn.primary:hover { background: #fff; border-color: #fff; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  margin: .45rem 0;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text);
  border: none;
  cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text);
  border: none;
  cursor: pointer;
}

pre {
  margin: 0;
  padding: .7rem .85rem;
  overflow-x: auto;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
code {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-dim);
  line-height: 1.55;
}

.koe-output {
  display: block;
  min-height: 1.5em;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--text);
}
.koe-output.is-empty { color: var(--text-faint); }

.foot {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-faint);
  font-size: 12px;
}

.muted { color: var(--text-dim); }

.banner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: .65rem 1.25rem;
  background: #0a0a0a;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-dim);
}
.banner[hidden] { display: none; }
.banner-text { flex: 1; line-height: 1.5; }
.banner-text code {
  font-family: var(--mono);
  font-size: 11px;
  padding: 1px 5px;
  background: #161616;
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text);
}
.banner-actions { display: inline-flex; gap: .35rem; flex-shrink: 0; }
.btn-sm {
  flex: 0 0 auto;
  padding: .3rem .7rem;
  font-size: 12px;
  font-weight: 500;
  border-radius: 4px;
}
.faint { color: var(--text-faint); }
.row { display: flex; align-items: center; gap: .5rem; }
.spacer { flex: 1; }
.hidden { display: none !important; }

@media (max-width: 640px) {
  .nav-burger {
    display: inline-flex;
    margin-left: auto;
    width: 32px;
    height: 32px;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-dim);
    background: transparent;
    cursor: pointer;
    font-size: 16px;
  }
  .nav-burger:hover { color: var(--text); }
  .nav-links { display: none; }
  .nav-links.is-open {
    display: flex;
    position: absolute;
    top: 48px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: .5rem;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
  }
  .nav-links.is-open a { padding: 8px 12px; border-radius: var(--radius-sm); }
  .main { padding-top: 1.5rem; }
  .actions { flex-direction: column; }
  .grid { grid-template-columns: 1fr; }
}