:root {
  --bg: #ffffff;
  --secondary: #f6f8fa;
  --border: #d0d7de;
  --border-muted: #e1e4e8;
  --text: #1f2328;
  --text-secondary: #656d76;
  --accent: #0969da;
  --accent-hover: #0860c7;
  --green: #1a7f37;
  --green-bg: #dafbe1;
  --yellow: #9a6700;
  --yellow-bg: #fff8c5;
  --red: #cf222e;
  --red-bg: #ffebe9;
  --purple: #8250df;
  --purple-bg: #fbefff;
  --code-bg: #f6f8fa;
  --json-key: #0550ae;
  --json-string: #0a3069;
  --json-number: #953800;
  --json-bool: #cf222e;
  --json-null: #6e7781;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
code, pre, .mono { font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace; font-size: 13px; }

/* Topbar */
.topbar {
  position: sticky; top: 0; z-index: 100;
  height: 48px; background: var(--bg);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center;
  padding: 0 24px; gap: 16px;
}
.topbar-logo {
  display: flex; align-items: center; gap: 8px;
  font-weight: 600; font-size: 14px; color: var(--text);
  text-decoration: none;
}
.topbar-spacer { flex: 1; }
.topbar-link {
  font-size: 13px; color: var(--text-secondary);
  text-decoration: none; padding: 4px 8px; border-radius: 4px;
}
.topbar-link:hover { color: var(--text); background: var(--secondary); }

/* Main */
.main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 24px 48px;
}
h1 { font-size: 28px; font-weight: 600; margin-bottom: 8px; }
.subtitle { color: var(--text-secondary); font-size: 15px; margin-bottom: 32px; }

/* Status banner */
.status {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px; border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--secondary);
  margin-bottom: 24px;
  font-size: 14px;
}
.status .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--text-secondary); flex-shrink: 0;
}
.status.valid { border-color: var(--green); background: var(--green-bg); }
.status.valid .dot { background: var(--green); }
.status.expired { border-color: var(--red); background: var(--red-bg); }
.status.expired .dot { background: var(--red); }
.status.soon { border-color: var(--yellow); background: var(--yellow-bg); }
.status.soon .dot { background: var(--yellow); }
.status .msg { font-weight: 600; }
.status .msg-sub { color: var(--text-secondary); font-size: 13px; margin-left: 4px; }

/* Input */
.section { margin-bottom: 24px; }
.section-label {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 13px; font-weight: 600; margin-bottom: 8px;
}
.jwt-input {
  width: 100%;
  min-height: 120px;
  padding: 12px 14px;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px; line-height: 1.6;
  color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 6px;
  resize: vertical; outline: none;
  word-break: break-all;
  transition: border-color 150ms, box-shadow 150ms;
}
.jwt-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(9,105,218,0.15);
}
.jwt-input::placeholder { color: var(--text-secondary); }

.actions { display: flex; gap: 8px; margin-top: 8px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px; font-size: 13px; font-weight: 500;
  border: 1px solid var(--border); border-radius: 6px;
  background: var(--bg); color: var(--text);
  cursor: pointer; font-family: inherit;
  transition: background 150ms, border-color 150ms;
}
.btn:hover { background: var(--secondary); }
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-hover); }
.btn-ghost { border-color: transparent; }
.btn-ghost:hover { background: var(--secondary); }

/* Two-pane grid for decode */
.panes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 720px) { .panes { grid-template-columns: 1fr; } }
.pane {
  border: 1px solid var(--border); border-radius: 6px;
  background: var(--bg); overflow: hidden;
}
.pane-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 12px;
  background: var(--secondary);
  border-bottom: 1px solid var(--border);
  font-size: 12px; font-weight: 600; color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.5px;
}
.pane-header .title-group { display: flex; align-items: center; gap: 8px; }
.pane-header .label-alg {
  font-size: 11px; padding: 2px 6px;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 3px; color: var(--text);
  font-family: ui-monospace, SFMono-Regular, monospace;
  text-transform: none; letter-spacing: 0;
}
.pane-header button {
  background: none; border: 1px solid var(--border);
  padding: 2px 8px; font-size: 11px; font-weight: 500;
  color: var(--text-secondary); border-radius: 4px; cursor: pointer;
  font-family: inherit;
}
.pane-header button:hover { color: var(--text); background: var(--bg); }
.pane-header button.copied { color: var(--green); border-color: var(--green); }
.pane-body { padding: 12px 14px; min-height: 100px; max-height: 360px; overflow: auto; }
.pane-body.empty { color: var(--text-secondary); font-style: italic; font-size: 13px; }
.pane-body pre { font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace; font-size: 13px; line-height: 1.55; white-space: pre-wrap; word-break: break-all; }
.pane-body .signature-hex { color: var(--text-secondary); font-size: 12px; line-height: 1.6; word-break: break-all; }
.pane-body .err { color: var(--red); font-size: 13px; }

/* JSON syntax */
.json .k { color: var(--json-key); }
.json .s { color: var(--json-string); }
.json .n { color: var(--json-number); }
.json .b { color: var(--json-bool); }
.json .nl { color: var(--json-null); }
.json .p { color: var(--text-secondary); }

/* Claims table */
.claims { margin-top: 8px; }
.claims-row {
  display: grid; grid-template-columns: 100px minmax(0, 1fr) auto;
  gap: 12px; padding: 6px 0;
  border-top: 1px solid var(--border-muted);
  font-size: 13px; align-items: center;
}
.claims-row:first-child { border-top: none; }
.claims-row .claim-name { font-family: ui-monospace, SFMono-Regular, monospace; color: var(--text-secondary); }
.claims-row .claim-value { font-family: ui-monospace, SFMono-Regular, monospace; word-break: break-word; }
.claims-row .claim-value.rel { color: var(--text); }
.claim-badge {
  font-size: 10px; padding: 2px 6px; border-radius: 3px;
  font-weight: 600; text-transform: uppercase; letter-spacing: 0.3px;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
}
.badge-ok { background: var(--green-bg); color: var(--green); }
.badge-warn { background: var(--yellow-bg); color: var(--yellow); }
.badge-bad { background: var(--red-bg); color: var(--red); }
.badge-info { background: var(--secondary); color: var(--text-secondary); border: 1px solid var(--border); }

/* Verify panel */
.verify-panel {
  border: 1px solid var(--border); border-radius: 6px;
  background: var(--bg); margin-top: 8px;
}
.verify-panel summary {
  padding: 12px 16px; cursor: pointer;
  font-weight: 600; font-size: 14px;
  list-style: none; user-select: none;
  display: flex; align-items: center; justify-content: space-between;
}
.verify-panel summary::-webkit-details-marker { display: none; }
.verify-panel summary::after { content: '+'; font-size: 18px; color: var(--text-secondary); font-weight: 400; }
.verify-panel[open] summary::after { content: '−'; }
.verify-panel .body { padding: 0 16px 16px; border-top: 1px solid var(--border-muted); padding-top: 16px; }
.verify-row { display: flex; gap: 12px; align-items: center; margin-bottom: 12px; flex-wrap: wrap; }
.verify-row label { font-size: 13px; color: var(--text-secondary); min-width: 80px; }
.verify-row select, .verify-row input {
  padding: 5px 8px; font-size: 13px; font-family: inherit;
  border: 1px solid var(--border); border-radius: 6px; background: var(--bg); color: var(--text);
  outline: none; transition: border-color 150ms, box-shadow 150ms;
}
.verify-row select:focus, .verify-row input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(9,105,218,0.15); }
.verify-row .key-input {
  width: 100%; min-height: 100px;
  font-family: ui-monospace, SFMono-Regular, monospace; font-size: 12px;
  padding: 8px 10px;
  border: 1px solid var(--border); border-radius: 6px;
  background: var(--bg); color: var(--text); resize: vertical; outline: none;
}
.verify-row .key-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(9,105,218,0.15); }
.verify-result {
  margin-top: 12px; padding: 10px 12px;
  border-radius: 6px; font-size: 13px;
  display: flex; align-items: center; gap: 8px;
}
.verify-result.ok { background: var(--green-bg); color: var(--green); border: 1px solid var(--green); }
.verify-result.fail { background: var(--red-bg); color: var(--red); border: 1px solid var(--red); }
.verify-result.pending { background: var(--secondary); color: var(--text-secondary); border: 1px solid var(--border); }

/* FAQ */
.faq { display: flex; flex-direction: column; gap: 14px; }
.faq-item { border: 1px solid var(--border); border-radius: 6px; padding: 12px 14px; background: var(--bg); }
.faq-q { font-weight: 600; font-size: 14px; margin-bottom: 6px; }
.faq-a { color: var(--text-secondary); font-size: 13px; line-height: 1.6; }
.faq-a code { background: var(--secondary); border: 1px solid var(--border-muted); padding: 1px 5px; border-radius: 3px; font-size: 12px; color: var(--text); }

/* Quick references */
.refs {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px; margin-top: 24px;
}
.ref-card {
  border: 1px solid var(--border); border-radius: 6px;
  padding: 12px 14px; background: var(--bg);
  text-decoration: none; color: var(--text); display: block;
  transition: border-color 150ms, transform 150ms;
}
.ref-card:hover { border-color: var(--accent); }
.ref-card .ref-title { font-weight: 600; font-size: 13px; margin-bottom: 4px; }
.ref-card .ref-desc { font-size: 12px; color: var(--text-secondary); line-height: 1.5; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--secondary);
  margin-top: 48px;
  padding: 40px 24px 24px;
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.6;
}
.footer-inner { max-width: 1100px; margin: 0 auto; }
.footer-h { font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.5px; }
.footer-p { font-size: 13px; color: var(--text-secondary); margin-bottom: 8px; }
.footer-p code { background: var(--bg); border: 1px solid var(--border-muted); padding: 1px 5px; border-radius: 3px; font-size: 12px; color: var(--text); }
.footer-section { margin-bottom: 24px; }
.footer-section.footer-cta { background: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 16px; }
.footer-section.footer-cta a { color: var(--accent); text-decoration: none; font-weight: 500; }
.footer-section.footer-cta a:hover { text-decoration: underline; }
.footer-meta { padding-top: 16px; border-top: 1px solid var(--border); font-size: 12px; color: var(--text-secondary); }
.footer-meta a { color: var(--text-secondary); text-decoration: none; }
.footer-meta a:hover { color: var(--text); text-decoration: underline; }

/* Dark mode */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --secondary: #161b22;
    --border: #30363d;
    --border-muted: #21262d;
    --text: #c9d1d9;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --accent-hover: #79b8ff;
    --green: #3fb950;
    --green-bg: #033a16;
    --yellow: #d29922;
    --yellow-bg: #341a00;
    --red: #f85149;
    --red-bg: #3c0d0d;
    --purple: #d2a8ff;
    --purple-bg: #2e1a47;
    --code-bg: #161b22;
    --json-key: #79c0ff;
    --json-string: #a5d6ff;
    --json-number: #ffa657;
    --json-bool: #ff7b72;
    --json-null: #8b949e;
  }
  .btn-primary { color: #fff; }
  .topbar { background: var(--bg); }
  .ref-card { background: var(--bg); }
}