/* Paying.co Developer Tools — shared design system
   Mirrors paying.co: teal accent, Material Design surfaces, Material Symbols */

:root {
  --teal-50: #f0fdfa;
  --teal-100: #ccfbf1;
  --teal-400: #2dd4bf;
  --teal-500: #14b8a6;
  --teal-600: #0d9488;
  --teal-700: #0f766e;

  --ink-900: #0a1414;
  --ink-800: #14201f;
  --ink-700: #1f2d2c;
  --ink-600: #334240;
  --slate-500: #5b6b69;
  --slate-400: #7d8e8c;
  --slate-300: #a8b6b4;
  --slate-200: #d4dcdb;
  --slate-100: #e9efee;
  --surface: #f7faf9;
  --white: #ffffff;

  --ok: #16a34a;
  --warn: #d97706;
  --err: #dc2626;
  --info: #0284c7;

  --radius: 14px;
  --radius-sm: 9px;
  --shadow-1: 0 1px 2px rgba(10,20,20,.06), 0 1px 3px rgba(10,20,20,.04);
  --shadow-2: 0 4px 12px rgba(10,20,20,.08), 0 2px 4px rgba(10,20,20,.05);
  --shadow-3: 0 12px 32px rgba(10,20,20,.12), 0 4px 8px rgba(10,20,20,.06);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Roboto Mono", ui-monospace, "Cascadia Code", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink-800);
  background: var(--surface);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--teal-600); text-decoration: none; }
a:hover { color: var(--teal-700); }

.material-symbols-rounded {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  vertical-align: middle;
  font-size: 1.2em;
  line-height: 1;
}

/* ---------- Hybrid header: real top bar + tool-switcher ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--slate-100);
}
.topbar-main {
  max-width: 1120px; margin: 0 auto; padding: 16px 24px;
  display: flex; align-items: center; gap: 16px;
}
.brand { display: inline-flex; align-items: center; flex-shrink: 0; }
.brand img { height: 30px; width: auto; display: block; }
.topbar .spacer { flex: 1; }
.back-link {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 15px; font-weight: 600; color: var(--ink-800);
  padding: 8px 6px; transition: color .15s;
}
.back-link:hover { color: var(--teal-600); }
.back-link .material-symbols-rounded { font-size: 20px; }
.nav-cta {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 15px; font-weight: 600; color: var(--teal-700);
  padding: 11px 22px; border-radius: 999px; border: 1.5px solid var(--teal-500);
  transition: background .15s, color .15s; white-space: nowrap;
}
.nav-cta:hover { background: var(--teal-500); color: #fff; }
.nav-cta .material-symbols-rounded { font-size: 18px; }

/* tool-switcher strip */
.toolbar {
  border-top: 1px solid var(--slate-100);
  background: rgba(247,250,249,.6);
}
.toolbar-inner {
  max-width: 1120px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; gap: 2px; overflow-x: auto;
  scrollbar-width: none;
}
.toolbar-inner::-webkit-scrollbar { display: none; }
.toolbar-inner a {
  font-size: 13.5px; font-weight: 600; color: var(--slate-500);
  padding: 12px 14px; border-bottom: 2px solid transparent;
  transition: color .15s, border-color .15s; white-space: nowrap; flex-shrink: 0;
}
.toolbar-inner a:hover { color: var(--ink-800); }
.toolbar-inner a.active { color: var(--teal-700); border-bottom-color: var(--teal-500); }
.toolbar-inner .tb-label {
  font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .07em;
  color: var(--slate-400); padding: 12px 12px 12px 0; flex-shrink: 0;
}
.toolbar-inner .tb-spacer { flex: 1; min-width: 8px; }
.toolbar-inner .tb-repos { display: inline-flex; align-items: center; gap: 5px; }
.toolbar-inner .tb-repos .material-symbols-rounded { font-size: 15px; }

@media (max-width: 720px) {
  .back-link span:not(.material-symbols-rounded) { display: none; }
  .nav-cta { padding: 9px 16px; font-size: 14px; }
  .topbar-main { padding: 13px 18px; }
  .toolbar-inner { padding: 0 18px; }
  .toolbar-inner .tb-label { display: none; }
}

/* ---------- Layout ---------- */
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 920px; }

.crumbs {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  font-size: 13px; color: var(--slate-400); margin: 24px auto;
}
.crumbs a { color: var(--slate-500); }
.crumbs .sep { color: var(--slate-300); }
.crumbs .here { color: var(--ink-700); font-weight: 600; }

/* ---------- Hero ---------- */
.hero { padding: 40px 0 24px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em;
  color: var(--teal-700); background: var(--teal-50);
  padding: 6px 12px; border-radius: 999px; border: 1px solid var(--teal-100);
}
h1 {
  font-size: clamp(30px, 5vw, 46px); line-height: 1.08; letter-spacing: -.025em;
  margin: 18px 0 14px; color: var(--ink-900); font-weight: 800;
}
.lede { font-size: clamp(16px, 2.2vw, 19px); color: var(--slate-500); max-width: 680px; margin: 0; }

/* ---------- Tool cards (hub) ---------- */
.tool-grid {
  display: grid; gap: 18px; margin: 36px 0 0;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}
.tool-card {
  display: flex; flex-direction: column; gap: 12px;
  background: var(--white); border: 1px solid var(--slate-100);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-1);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s;
}
.tool-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-2); border-color: var(--teal-100); }
.tool-card .ic {
  width: 44px; height: 44px; border-radius: 11px; display: grid; place-items: center;
  background: var(--teal-50); color: var(--teal-600); font-size: 24px;
}
.tool-card h3 { margin: 0; font-size: 18px; color: var(--ink-900); letter-spacing: -.01em; }
.tool-card p { margin: 0; font-size: 14px; color: var(--slate-500); flex: 1; }
.tool-card .go {
  display: inline-flex; align-items: center; gap: 6px; font-size: 14px; font-weight: 600;
  color: var(--teal-700);
}
.tool-card .tag {
  font-size: 11px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase;
  color: var(--slate-400);
}

/* ---------- Repository cards ---------- */
.repo-grid {
  display: grid; gap: 18px; margin: 36px 0 0;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}
.repo-card {
  display: flex; flex-direction: column; gap: 14px;
  background: var(--white); border: 1px solid var(--slate-100);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-1);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s;
}
.repo-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-2); border-color: var(--teal-100); }
.repo-card .repo-head { display: flex; align-items: center; gap: 10px; }
.repo-card .repo-ic {
  width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center;
  background: var(--ink-900); color: #fff; font-size: 20px; flex-shrink: 0;
}
.repo-card h3 { margin: 0; font-size: 17px; color: var(--ink-900); font-family: var(--font-mono); letter-spacing: -.01em; }
.repo-card .repo-desc { margin: 0; font-size: 14px; color: var(--slate-500); flex: 1; }
.repo-langs { display: flex; flex-wrap: wrap; gap: 6px; }
.lang-pill {
  font-size: 11.5px; font-weight: 600; color: var(--ink-600);
  background: var(--surface); border: 1px solid var(--slate-200);
  padding: 3px 9px; border-radius: 999px;
}
.lang-pill .dot { display: inline-block; width: 8px; height: 8px; border-radius: 999px; margin-right: 5px; vertical-align: middle; }
.repo-foot { display: flex; align-items: center; gap: 14px; font-size: 13px; color: var(--slate-400); }
.repo-foot .repo-go {
  margin-left: auto; display: inline-flex; align-items: center; gap: 5px;
  font-weight: 600; color: var(--teal-700);
}
.repo-meta { display: inline-flex; align-items: center; gap: 4px; }
.repo-meta .material-symbols-rounded { font-size: 16px; }
.panel {
  background: var(--white); border: 1px solid var(--slate-100);
  border-radius: var(--radius); box-shadow: var(--shadow-1); padding: 22px;
}
.grid-2 { display: grid; gap: 20px; grid-template-columns: 1fr 1fr; margin-top: 28px; }
@media (max-width: 860px) { .grid-2 { grid-template-columns: 1fr; } }

.field-label {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 13px; font-weight: 600; color: var(--ink-700); margin-bottom: 8px;
}
.field-label .hint { font-weight: 500; color: var(--slate-400); font-size: 12px; }

textarea, input[type="text"] {
  width: 100%; font-family: var(--font-mono); font-size: 13.5px; line-height: 1.6;
  color: var(--ink-800); background: var(--surface);
  border: 1px solid var(--slate-200); border-radius: var(--radius-sm);
  padding: 13px 14px; resize: vertical; transition: border-color .15s, box-shadow .15s;
}
textarea { min-height: 180px; }
textarea:focus, input[type="text"]:focus {
  outline: none; border-color: var(--teal-400);
  box-shadow: 0 0 0 3px rgba(20,184,166,.12);
}

.btn-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }
.btn {
  display: inline-flex; align-items: center; gap: 7px; cursor: pointer;
  font-size: 14px; font-weight: 600; padding: 10px 18px; border-radius: 999px;
  border: 1px solid transparent; transition: background .15s, box-shadow .15s, transform .05s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--teal-600); color: #fff; box-shadow: var(--shadow-1); }
.btn-primary:hover { background: var(--teal-700); }
.btn-ghost { background: var(--white); color: var(--ink-700); border-color: var(--slate-200); }
.btn-ghost:hover { background: var(--slate-100); }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.chip {
  font-size: 12.5px; font-weight: 500; color: var(--slate-500); cursor: pointer;
  background: var(--surface); border: 1px solid var(--slate-200);
  padding: 6px 11px; border-radius: 999px; font-family: var(--font-mono);
  transition: border-color .15s, color .15s;
}
.chip:hover { border-color: var(--teal-400); color: var(--teal-700); }

/* result states */
.result-empty {
  display: grid; place-items: center; text-align: center; min-height: 200px;
  color: var(--slate-400); gap: 8px;
}
.result-empty .material-symbols-rounded { font-size: 38px; color: var(--slate-300); }

.banner {
  display: flex; align-items: flex-start; gap: 9px; padding: 11px 14px;
  border-radius: var(--radius-sm); font-size: 13.5px; margin-bottom: 14px;
}
.banner.ok  { background: #f0fdf4; color: #15803d; border: 1px solid #bbf7d0; }
.banner.err { background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; }
.banner.warn{ background: #fffbeb; color: #b45309; border: 1px solid #fde68a; }
.banner.info{ background: #f0f9ff; color: #0369a1; border: 1px solid #bae6fd; }

/* ---------- TLV tree ---------- */
.tlv-tree { font-family: var(--font-mono); font-size: 13px; }
.tlv-node {
  border-left: 2px solid var(--slate-200); margin-left: 4px; padding-left: 0;
}
.tlv-row {
  display: grid; grid-template-columns: auto 1fr; gap: 10px;
  padding: 9px 12px; border-radius: 8px; transition: background .12s;
  align-items: start;
}
.tlv-row:hover { background: var(--teal-50); }
.tlv-toggle {
  width: 18px; height: 18px; display: inline-grid; place-items: center;
  color: var(--slate-400); cursor: pointer; user-select: none;
}
.tlv-tag {
  font-weight: 700; color: var(--teal-700); background: var(--teal-50);
  padding: 1px 7px; border-radius: 5px; border: 1px solid var(--teal-100);
}
.tlv-tag.constructed { color: var(--info); background: #f0f9ff; border-color: #bae6fd; }
.tlv-name { color: var(--ink-700); font-family: var(--font-sans); font-size: 13px; }
.tlv-meta { color: var(--slate-400); font-size: 11.5px; }
.tlv-value { color: var(--ink-800); word-break: break-all; margin-top: 3px; }
.tlv-decoded { color: var(--teal-700); font-size: 12px; margin-top: 2px; }
.tlv-children { margin-left: 18px; border-left: 1px dashed var(--slate-200); padding-left: 6px; }

/* generic kv table */
.kv { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.kv td { padding: 9px 12px; border-bottom: 1px solid var(--slate-100); vertical-align: top; }
.kv tr:last-child td { border-bottom: none; }
.kv .k { color: var(--slate-500); font-weight: 600; width: 40%; }
.kv .v { color: var(--ink-800); font-family: var(--font-mono); }
.mono { font-family: var(--font-mono); }
.pill {
  display: inline-block; font-size: 11px; font-weight: 700; padding: 2px 8px;
  border-radius: 999px; letter-spacing: .03em;
}
.pill.ok { background: #dcfce7; color: #15803d; }
.pill.err { background: #fee2e2; color: #b91c1c; }
.pill.neutral { background: var(--slate-100); color: var(--slate-500); }

.copy-btn {
  cursor: pointer; color: var(--slate-400); font-size: 13px; font-weight: 600;
  display: inline-flex; align-items: center; gap: 5px; background: none; border: none;
  padding: 4px 8px; border-radius: 6px;
}
.copy-btn:hover { color: var(--teal-700); background: var(--teal-50); }

/* ---------- Info / SEO body ---------- */
.prose { margin-top: 48px; max-width: 760px; }
.prose h2 { font-size: 22px; color: var(--ink-900); letter-spacing: -.015em; margin: 36px 0 12px; }
.prose h3 { font-size: 17px; color: var(--ink-800); margin: 24px 0 8px; }
.prose p { color: var(--slate-600); font-size: 15.5px; color: var(--ink-600); }
.prose ul { color: var(--ink-600); font-size: 15.5px; padding-left: 0; list-style: none; }
.prose li { padding-left: 24px; position: relative; margin: 7px 0; }
.prose li::before { content: "\2192"; position: absolute; left: 0; color: var(--teal-500); font-weight: 700; }
.faq-item { border-top: 1px solid var(--slate-100); padding: 18px 0; }
.faq-item h3 { margin: 0 0 6px; }
.faq-item p { margin: 0; }

/* ---------- Footer ---------- */
.foot {
  margin-top: 64px; border-top: 1px solid var(--slate-100);
  background: var(--white);
}
.foot-inner {
  max-width: 1120px; margin: 0 auto; padding: 32px 24px;
  display: flex; flex-wrap: wrap; gap: 16px; align-items: center;
  font-size: 13.5px; color: var(--slate-500);
}
.foot-inner .spacer { flex: 1; }
.foot a { color: var(--slate-500); font-weight: 600; }
.foot a:hover { color: var(--teal-700); }
.foot .sep { color: var(--slate-300); margin: 0 4px; }

.disclaimer {
  margin-top: 18px; font-size: 12.5px; color: var(--slate-400);
  display: flex; gap: 8px; align-items: flex-start;
}
.disclaimer .material-symbols-rounded { font-size: 18px; color: var(--slate-300); }

/* utility */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}