:root {
  color-scheme: light dark;
  --bg: #0e1117;
  --bg-elev: #161b24;
  --bg-input: #0f141c;
  --card: #161b24;
  --line: #232a36;
  --line-soft: #1c222d;
  --fg: #e7ebf2;
  --fg-muted: #97a1b2;
  --fg-faint: #6b7585;
  --accent: #4c8dff;
  --accent-press: #3a78e6;
  --radius: 14px;
  --radius-sm: 9px;
  --pass: #43c478;
  --fail: #f76d6d;
  --warn: #f0b54a;
  --grey: #8a94a6;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.4);
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Fira Code", Menlo, monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f4f6fa;
    --bg-elev: #ffffff;
    --bg-input: #ffffff;
    --card: #ffffff;
    --line: #e2e7ef;
    --line-soft: #eef1f6;
    --fg: #1a2230;
    --fg-muted: #5a6679;
    --fg-faint: #93a0b3;
    --shadow: 0 14px 40px rgba(40, 60, 100, 0.12);
  }
}

* {
  box-sizing: border-box;
}

html {
  scrollbar-gutter: stable;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.55 var(--sans);
  -webkit-font-smoothing: antialiased;
}

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

/* ---------------- masthead + tabs ---------------- */

.masthead {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.masthead-inner {
  max-width: 920px;
  margin: 0 auto;
  padding: 1.4rem 1.5rem 0.6rem;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.brand h1 {
  margin: 0;
  font-size: 1.4rem;
  letter-spacing: -0.02em;
  font-weight: 700;
}

.brand h1 span {
  color: var(--fg-muted);
  font-weight: 500;
}

.brand p {
  margin: 0.25rem 0 0;
  color: var(--fg-muted);
  font-size: 0.9rem;
}

.wasm-badge {
  flex: none;
  font: 500 0.72rem/1 var(--mono);
  padding: 0.4rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--fg-muted);
  white-space: nowrap;
}
.wasm-badge[data-state="ok"] {
  color: var(--pass);
  border-color: color-mix(in srgb, var(--pass) 40%, transparent);
}
.wasm-badge[data-state="err"] {
  color: var(--fail);
  border-color: color-mix(in srgb, var(--fail) 40%, transparent);
}

.tabs {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  gap: 0.25rem;
}

.tab {
  appearance: none;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--fg-muted);
  font: 600 0.9rem var(--sans);
  padding: 0.7rem 0.85rem;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.tab:hover {
  color: var(--fg);
}
.tab.active {
  color: var(--fg);
  border-bottom-color: var(--accent);
}
.tab-end {
  margin-left: auto;
}

/* ---------------- stage + cards ---------------- */

.stage {
  max-width: 920px;
  margin: 0 auto;
  padding: 1.5rem;
}

.panel:not([hidden]) {
  display: grid;
  gap: 1.25rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem;
  box-shadow: var(--shadow);
}

.card h2 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.card-sub {
  margin: 0 0 1rem;
  color: var(--fg-muted);
  font-size: 0.88rem;
}

.card-tag {
  font: 500 0.7rem var(--mono);
  color: var(--fg-faint);
  margin-left: 0.4rem;
}

/* ---------------- forms ---------------- */

label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--fg-muted);
  margin-top: 1rem;
}

.card > label:first-of-type,
.card h2 + label {
  margin-top: 0.6rem;
}

.hint {
  font-weight: 400;
  color: var(--fg-faint);
  margin-left: 0.35rem;
}

input[type="text"],
textarea,
select {
  width: 100%;
  margin-top: 0.35rem;
  background: var(--bg-input);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--fg);
  font: 0.9rem var(--sans);
  padding: 0.55rem 0.7rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}

textarea {
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.5;
  resize: vertical;
  white-space: pre;
  overflow-wrap: normal;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent);
}

.field {
  margin-top: 1rem;
}
.label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  min-height: 1.6rem;
}
.label-row label {
  margin: 0;
}

.grid {
  display: grid;
  gap: 0.85rem;
}
.grid.two {
  grid-template-columns: 1fr 1fr;
}
@media (max-width: 640px) {
  .grid.two {
    grid-template-columns: 1fr;
  }
}

fieldset.checks {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.9rem;
  margin: 0.6rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
}
fieldset.checks legend {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--fg-muted);
  padding: 0 0.4rem;
}
.check {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 500;
  color: var(--fg);
}
.check input {
  width: auto;
  margin: 0;
  accent-color: var(--accent);
}

/* ---------------- buttons ---------------- */

.actions {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  color: var(--fg);
  font: 600 0.85rem var(--sans);
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.05s;
}
.btn:hover {
  border-color: var(--accent);
}
.btn:active {
  transform: translateY(1px);
}
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn.primary:hover {
  background: var(--accent-press);
}
.btn.primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.btn.ghost {
  background: none;
  padding: 0.3rem 0.6rem;
  font-size: 0.75rem;
  color: var(--fg-muted);
}
.btn.sample {
  background: none;
  color: var(--fg-muted);
}

/* segmented control */
.segmented {
  display: inline-flex;
  margin-top: 1rem;
  background: var(--bg-input);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.2rem;
  gap: 0.2rem;
}
.seg {
  appearance: none;
  border: none;
  background: none;
  color: var(--fg-muted);
  font: 600 0.8rem var(--sans);
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  cursor: pointer;
}
.seg.active {
  background: var(--accent);
  color: #fff;
}

/* ---------------- context strip ---------------- */

.context-strip {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: var(--fg-muted);
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.85rem;
}
.context-strip b {
  color: var(--fg);
  font-family: var(--mono);
  font-weight: 600;
}
.context-strip a {
  margin-left: auto;
  font-weight: 600;
  text-decoration: none;
}

/* ---------------- outputs ---------------- */

.output-block {
  margin-top: 1.1rem;
}
.output-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--fg-muted);
  margin-bottom: 0.35rem;
}
.output {
  margin: 0;
  background: var(--bg-input);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0.8rem 0.9rem;
  font: 0.78rem/1.55 var(--mono);
  color: var(--fg);
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 360px;
  overflow: auto;
}

.error {
  margin-top: 0.9rem;
  background: color-mix(in srgb, var(--fail) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--fail) 45%, transparent);
  color: var(--fail);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.8rem;
  font-size: 0.82rem;
  white-space: pre-wrap;
}

.warn {
  margin: 1rem 0 0;
  font-size: 0.8rem;
  color: var(--warn);
}

.key-status {
  margin-top: 1rem;
  font: 600 0.82rem var(--mono);
  color: var(--fg-muted);
}
.key-status.set {
  color: var(--pass);
}

.saved-flash {
  text-align: right;
  color: var(--pass);
  font-size: 0.8rem;
  margin-top: 0.5rem;
}

/* ---------------- results ---------------- */

.results {
  margin-top: 1.2rem;
  display: grid;
  gap: 0.6rem;
}
.result-row {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-elev);
}
.result-top {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.7rem 0.9rem;
}
.result-name {
  font-weight: 700;
  width: 4.2rem;
}
.chip {
  font: 700 0.7rem var(--mono);
  letter-spacing: 0.03em;
  padding: 0.22rem 0.55rem;
  border-radius: 999px;
  border: 1px solid currentColor;
}
.chip.pass { color: var(--pass); }
.chip.fail { color: var(--fail); }
.chip.warn { color: var(--warn); }
.chip.grey { color: var(--grey); }
.result-detail {
  margin: 0;
  padding: 0 0.9rem 0.8rem 5.9rem;
  color: var(--fg-muted);
  font: 0.78rem/1.5 var(--mono);
  white-space: pre-wrap;
}

/* ---------------- footer ---------------- */

.footer {
  max-width: 920px;
  margin: 1rem auto 3rem;
  padding: 0 1.5rem;
  color: var(--fg-faint);
  font-size: 0.8rem;
}