:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1e222b;
  --fg: #e6e8ec;
  --muted: #8a93a6;
  --accent: #9ae6b4;
  --accent-2: #7cc4ff;
  --border: #272b35;
  --error: #ff6b6b;
  --warn: #f5c26b;
  --privacy-bg: rgba(154, 230, 180, 0.08);
  --privacy-border: rgba(154, 230, 180, 0.3);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  font-size: 15px;
  line-height: 1.6;
}

header {
  padding: 24px 32px 8px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border);
}
header h1 { margin: 0; font-size: 22px; }
header #subtitle {
  grid-column: 1 / 2;
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 14px;
}
.lang-switch {
  grid-column: 2 / 3;
  grid-row: 1 / 3;
  display: flex;
  align-items: center;
  gap: 6px;
}

main {
  padding: 24px 32px 48px;
  max-width: 1000px;
  margin: 0 auto;
}

.privacy-note {
  margin: 0 0 20px;
  padding: 10px 14px;
  background: var(--privacy-bg);
  border: 1px solid var(--privacy-border);
  border-radius: 6px;
  color: var(--accent);
  font-size: 13px;
}

section { margin-bottom: 20px; }

label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}

textarea {
  width: 100%;
  padding: 12px 14px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--fg);
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
  line-height: 1.5;
  resize: vertical;
}
textarea:focus { outline: none; border-color: var(--accent); }

select {
  padding: 8px 10px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--fg);
  font-size: 13px;
}

.error {
  margin: 10px 0 0;
  padding: 10px 14px;
  color: var(--error);
  background: rgba(255, 107, 107, 0.08);
  border: 1px solid rgba(255, 107, 107, 0.3);
  border-radius: 6px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
}

.decoded {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 800px) {
  .decoded { grid-template-columns: 1fr 1fr; }
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 18px;
}

.card h2 {
  margin: 0 0 10px;
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}

.card pre {
  margin: 0;
  padding: 12px 14px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
  color: var(--accent-2);
  white-space: pre-wrap;
  word-break: break-all;
  overflow-x: auto;
}
.card pre.signature { color: var(--muted); }

.claims table {
  width: 100%;
  border-collapse: collapse;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
}
.claims th, .claims td {
  padding: 8px 10px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.claims th {
  color: var(--muted);
  text-transform: uppercase;
  font-size: 10px;
  letter-spacing: 0.06em;
}
.claims tr.warn td {
  color: var(--warn);
}

#warnings-output {
  font-size: 13px;
  color: var(--muted);
  padding: 10px 12px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
}
#warnings-output.warn {
  color: var(--warn);
  border-color: var(--warn);
  background: rgba(245, 194, 107, 0.05);
}

.muted { color: var(--muted); font-size: 13px; }

footer {
  padding: 24px 32px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}