:root {
  --bg: #f3f5f8;
  --card: #ffffff;
  --text: #1f2933;
  --muted: #5f6b7a;
  --border: #d9dee6;
  --accent: #2f5d9c;
  --accent-strong: #244a7d;
  --accent-soft: #e8eef8;
  --warn-bg: #fff6e0;
  --warn-border: #f0c36d;
  --error-bg: #fdecec;
  --error-border: #e5a0a0;
  --code-bg: #f1f3f6;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11161d;
    --card: #1a212b;
    --text: #e4e8ee;
    --muted: #9aa5b4;
    --border: #2e3846;
    --accent: #6d9ee0;
    --accent-strong: #8fb5ea;
    --accent-soft: #223149;
    --warn-bg: #3a3017;
    --warn-border: #8a6d2c;
    --error-bg: #3b1f22;
    --error-border: #8a3c42;
    --code-bg: #232b36;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
}

a { color: var(--accent); }
code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.88em; }
code { background: var(--code-bg); padding: 0.1em 0.35em; border-radius: 4px; }
pre { background: var(--code-bg); padding: 0.8rem 1rem; border-radius: 6px; overflow-x: auto; }

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

/* ---------------------------------------------------------------- header */
.header {
  background: linear-gradient(135deg, #2f5d9c 0%, #1d3b66 100%);
  color: #fff;
  padding: 1.6rem 1rem 1.4rem;
}
.header-inner { max-width: 960px; margin: 0 auto; }
.header h1 { margin: 0; font-size: 1.6rem; line-height: 1.25; }
.tagline { margin: 0.3rem 0 0; opacity: 0.85; }

/* ---------------------------------------------------------------- layout */
.main { max-width: 960px; margin: 1.5rem auto; padding: 0 1rem; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}
.card h2 { margin: 0 0 0.9rem; font-size: 1.2rem; }

.form-section { padding-bottom: 1.3rem; margin-bottom: 1.3rem; border-bottom: 1px solid var(--border); }
.form-section:last-of-type { border-bottom: 0; }
.step {
  display: inline-grid; place-items: center;
  width: 1.6rem; height: 1.6rem; margin-right: 0.4rem;
  border-radius: 50%; background: var(--accent); color: #fff; font-size: 0.9rem;
}

.row { display: flex; gap: 1.2rem; flex-wrap: wrap; }
.col { flex: 1 1 260px; }

.label { display: block; font-weight: 600; margin-bottom: 0.3rem; }
.input {
  width: 100%;
  padding: 0.6rem 0.7rem;
  font: inherit;
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.upper { text-transform: uppercase; }
.upper::placeholder { text-transform: none; }
.hint { color: var(--muted); font-size: 0.88rem; margin: 0.35rem 0 0; }

/* ---------------------------------------------------------------- source */
.segmented { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; margin-bottom: 1rem; }
.segmented label { padding: 0.5rem 1rem; cursor: pointer; }
.segmented label:has(input:checked) { background: var(--accent-soft); color: var(--accent-strong); font-weight: 600; }
.segmented input { margin-right: 0.35rem; }

.drop-zone {
  display: block;
  padding: 1.6rem 1rem;
  text-align: center;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.drop-zone:hover, .drop-zone.dragging { border-color: var(--accent); background: var(--accent-soft); }
.drop-zone .hint { display: block; }
#logFiles:focus-visible + .drop-zone { outline: 2px solid var(--accent); outline-offset: 2px; }

.file-list { list-style: none; padding: 0; margin: 0.8rem 0 0; }
.file-list li {
  display: flex; align-items: baseline; gap: 0.5rem;
  padding: 0.4rem 0.6rem; border: 1px solid var(--border); border-radius: 6px; margin-bottom: 0.4rem;
}
.file-list small { color: var(--muted); flex: 1; }

.link-btn {
  background: none; border: 0; padding: 0; font: inherit;
  color: var(--accent); text-decoration: underline; cursor: pointer;
}

/* ---------------------------------------------------------------- outputs */
.options { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 0.6rem; }
.option {
  display: flex; gap: 0.6rem; align-items: flex-start;
  padding: 0.7rem 0.8rem; border: 1px solid var(--border); border-radius: 8px; cursor: pointer;
}
.option:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.option input { margin-top: 0.3rem; }
.option small { display: block; color: var(--muted); }
.option.disabled { opacity: 0.55; cursor: not-allowed; }

/* ---------------------------------------------------------------- buttons */
.actions { display: flex; gap: 0.8rem; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  font: inherit; font-weight: 600;
  border-radius: 8px; border: 1px solid transparent;
  cursor: pointer; text-decoration: none;
}
.btn.primary { background: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-strong); }
.btn.primary:disabled { opacity: 0.6; cursor: progress; }
.btn.secondary { background: transparent; color: var(--text); border-color: var(--border); }
@media (prefers-color-scheme: dark) {
  .btn.primary { color: #0e1620; }
}

/* ---------------------------------------------------------------- status */
.status { display: flex; align-items: center; gap: 0.8rem; }
.spinner {
  width: 22px; height: 22px; border-radius: 50%;
  border: 3px solid var(--accent-soft); border-top-color: var(--accent);
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.error { background: var(--error-bg); border-color: var(--error-border); }
.error p { white-space: pre-line; margin: 0; }
.warn { background: var(--warn-bg); border: 1px solid var(--warn-border); border-radius: 8px; padding: 0.6rem 0.9rem; margin: 1rem 0; }
.warn p { margin: 0.2rem 0; }

/* ---------------------------------------------------------------- results */
.results-head { display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap; }
.results-head h2 { margin: 0; }

.log-summary { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 0.8rem; margin: 1rem 0; }
.log-card { border: 1px solid var(--border); border-radius: 8px; padding: 0.8rem 1rem; }
.log-call { font-size: 1.3rem; font-weight: 700; color: var(--accent-strong); }
.log-source { color: var(--muted); font-size: 0.85rem; word-break: break-all; }
.log-card dl { display: grid; grid-template-columns: auto 1fr; gap: 0.1rem 0.8rem; margin: 0.5rem 0 0; font-size: 0.92rem; }
.log-card dt { color: var(--muted); }
.log-card dd { margin: 0; }

.file-group h3 { font-size: 1rem; margin: 1.2rem 0 0.5rem; }
.downloads { display: flex; flex-direction: column; gap: 0.4rem; }
.download {
  display: flex; justify-content: space-between; gap: 1rem;
  padding: 0.55rem 0.8rem; border: 1px solid var(--border); border-radius: 6px;
  text-decoration: none; word-break: break-all;
}
.download:hover { background: var(--accent-soft); }
.download small { color: var(--muted); white-space: nowrap; }

.thumbs { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 0.8rem; }
.thumb {
  display: block; border: 1px solid var(--border); border-radius: 8px; overflow: hidden;
  text-decoration: none; font-size: 0.8rem; background: #fff;
}
.thumb img { display: block; width: 100%; height: auto; }
.thumb span { display: block; padding: 0.4rem 0.6rem; color: #333; word-break: break-all; }

.notes { margin-top: 1.2rem; }
.notes summary { cursor: pointer; font-weight: 600; }
.notes h4 { margin: 1rem 0 0.3rem; font-size: 0.95rem; }
.notes pre { max-height: 320px; overflow: auto; font-size: 0.8rem; }

.help h2:not(:first-child) { margin-top: 1.4rem; }

/* ---------------------------------------------------------------- footer */
.footer { text-align: center; color: var(--muted); font-size: 0.85rem; padding: 1rem 1rem 2rem; }

@media (max-width: 600px) {
  .header h1 { font-size: 1.3rem; }
  .card { padding: 1.1rem; }
  .segmented { display: flex; }
  .segmented label { flex: 1; text-align: center; }
}