/* ── Reset & Base ──────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:         #0d0d0d;
  --bg-2:       #141414;
  --bg-3:       #1a1a1a;
  --bg-4:       #222222;
  --border:     #2a2a2a;
  --border-2:   #333333;
  --text:       #e8e8e8;
  --text-2:     #999999;
  --text-3:     #555555;
  --accent:     #f7931a;   /* Bitcoin orange — used sparingly */
  --accent-dim: #7a4a0d;
  --green:      #3d9970;
  --red:        #c0392b;
  --mono:       'IBM Plex Mono', monospace;
  --sans:       'IBM Plex Sans', sans-serif;
  --radius:     4px;
  --transition: 160ms ease;
}

html { font-size: 14px; scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--text-2); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--text); }

/* ── Header ────────────────────────────────────────────────── */
.site-header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 100;
}

.header-inner {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 24px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--mono);
  font-size: 1.15rem;
  color: var(--text);
  letter-spacing: -0.02em;
}
.logo-mark { color: var(--accent); }
.logo:hover { color: var(--text); }

.header-actions { display: flex; align-items: center; gap: 12px; }

.network-badge {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-3);
  border: 1px solid var(--border-2);
  padding: 2px 8px;
  border-radius: 2px;
  letter-spacing: 0.04em;
}

.btn-settings {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: 1px solid var(--border-2);
  color: var(--text-2);
  padding: 5px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: var(--sans);
  font-size: 0.82rem;
  transition: all var(--transition);
  position: relative;
}
.btn-settings:hover { border-color: var(--text-3); color: var(--text); }

.ai-indicator {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--text-3);
  transition: background var(--transition);
}
.ai-indicator.active { background: var(--green); }

/* ── Settings Panel ────────────────────────────────────────── */
.settings-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 200;
}
.settings-overlay.open { display: block; }

.settings-panel {
  position: fixed;
  top: 0; right: 0; bottom: 0;
  width: 320px;
  background: var(--bg-2);
  border-left: 1px solid var(--border);
  z-index: 201;
  transform: translateX(100%);
  transition: transform 240ms ease;
  display: flex;
  flex-direction: column;
}
.settings-panel.open { transform: translateX(0); }

.settings-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--text-2);
}

.settings-close {
  background: none; border: none; color: var(--text-3);
  cursor: pointer; font-size: 1rem; padding: 2px 6px;
  transition: color var(--transition);
}
.settings-close:hover { color: var(--text); }

.settings-body { padding: 20px; display: flex; flex-direction: column; gap: 18px; }

.settings-note {
  font-size: 0.8rem;
  color: var(--text-2);
  line-height: 1.55;
  border-left: 2px solid var(--border-2);
  padding-left: 10px;
}

.field-group { display: flex; flex-direction: column; gap: 7px; }
.field-label { font-family: var(--mono); font-size: 0.75rem; color: var(--text-3); letter-spacing: 0.04em; }

.provider-select { display: flex; gap: 6px; }
.provider-btn {
  flex: 1;
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text-2);
  padding: 7px 0;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: var(--sans);
  font-size: 0.8rem;
  transition: all var(--transition);
}
.provider-btn:hover { border-color: var(--border-2); color: var(--text); }
.provider-btn.active { border-color: var(--accent-dim); color: var(--accent); background: rgba(247,147,26,0.07); }

.key-input-wrap { position: relative; }
.key-input {
  width: 100%;
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 36px 8px 10px;
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 0.78rem;
  outline: none;
  transition: border-color var(--transition);
}
.key-input:focus { border-color: var(--border-2); }
.key-input::placeholder { color: var(--text-3); }

.key-toggle {
  position: absolute; right: 8px; top: 50%; transform: translateY(-50%);
  background: none; border: none; color: var(--text-3); cursor: pointer;
  padding: 2px; transition: color var(--transition);
}
.key-toggle:hover { color: var(--text-2); }

.btn-save-key {
  background: var(--bg-4);
  border: 1px solid var(--border-2);
  color: var(--text);
  padding: 9px 16px;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: var(--sans);
  font-size: 0.82rem;
  transition: all var(--transition);
}
.btn-save-key:hover { border-color: var(--accent-dim); color: var(--accent); }

.btn-clear-key {
  background: none; border: none; color: var(--text-3);
  cursor: pointer; font-size: 0.78rem; text-align: left;
  padding: 0; transition: color var(--transition);
  font-family: var(--sans);
}
.btn-clear-key:hover { color: var(--red); }

.settings-divider { border: none; border-top: 1px solid var(--border); }
.settings-footnote { font-size: 0.75rem; color: var(--text-3); line-height: 1.5; }
.settings-footnote a { color: var(--text-2); }
.settings-footnote a:hover { color: var(--accent); }

/* ── Main ──────────────────────────────────────────────────── */
.main {
  flex: 1;
  max-width: 780px;
  width: 100%;
  margin: 0 auto;
  padding: 0 24px 60px;
}

/* ── Hero ──────────────────────────────────────────────────── */
.hero {
  padding: 72px 0 48px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 40px;
}

.hero-title {
  font-family: var(--mono);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 12px;
}

.hero-sub {
  color: var(--text-2);
  font-size: 0.95rem;
  margin-bottom: 36px;
}

.search-wrap { max-width: 600px; }

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-2);
  border: 1px solid var(--border-2);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition);
}
.search-box:focus-within { border-color: #444; }

.search-input {
  flex: 1;
  background: none;
  border: none;
  color: var(--text);
  padding: 13px 8px 13px 16px;
  font-family: var(--mono);
  font-size: 0.82rem;
  outline: none;
  min-width: 0;
  letter-spacing: 0.02em;
}
.search-input::placeholder { color: var(--text-3); font-family: var(--sans); font-size: 0.85rem; letter-spacing: 0; }

.search-clear {
  background: none; border: none;
  color: var(--text-3);
  padding: 0 8px;
  cursor: pointer;
  font-size: 0.85rem;
  display: none;
  transition: color var(--transition);
  line-height: 1;
}
.search-clear:hover { color: var(--text-2); }
.search-clear.visible { display: flex; align-items: center; }

.search-btn {
  background: var(--bg-4);
  border: none;
  border-left: 1px solid var(--border-2);
  color: var(--text);
  padding: 0 20px;
  height: 100%;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--sans);
  font-size: 0.85rem;
  white-space: nowrap;
  transition: all var(--transition);
  min-height: 48px;
}
.search-btn:hover { background: #2a2a2a; }
.search-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-arrow { transition: transform var(--transition); }
.search-btn:hover .btn-arrow { transform: translateX(2px); }

.search-meta {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  padding: 0 2px;
}

.search-hint { font-size: 0.75rem; color: var(--text-3); font-family: var(--mono); }
.try-example {
  font-size: 0.75rem; color: var(--text-3);
  background: none; border: none; cursor: pointer;
  font-family: var(--sans);
  transition: color var(--transition);
  padding: 0;
}
.try-example:hover { color: var(--accent); }

/* ── Results ───────────────────────────────────────────────── */
.results { display: flex; flex-direction: column; gap: 16px; }

/* TX Bar */
.tx-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  gap: 12px;
  flex-wrap: wrap;
}

.tx-id-display { display: flex; align-items: center; gap: 8px; min-width: 0; }
.tx-id-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-3);
  letter-spacing: 0.1em;
  flex-shrink: 0;
}
.tx-id-value {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-2);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 320px;
}

.tx-bar-actions { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }

.tx-link {
  font-size: 0.78rem;
  color: var(--text-3);
  font-family: var(--mono);
  transition: color var(--transition);
}
.tx-link:hover { color: var(--accent); }

.tx-copy-link {
  display: flex;
  align-items: center;
  gap: 5px;
  background: none;
  border: 1px solid var(--border);
  color: var(--text-2);
  padding: 5px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.78rem;
  font-family: var(--sans);
  transition: all var(--transition);
  white-space: nowrap;
}
.tx-copy-link:hover { border-color: var(--border-2); color: var(--text); }
.tx-copy-link.copied { border-color: var(--green); color: var(--green); }


  background: none;
  border: 1px solid var(--border);
  color: var(--text-2);
  padding: 5px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.78rem;
  font-family: var(--sans);
  transition: all var(--transition);
}
.tx-new:hover { border-color: var(--border-2); color: var(--text); }

/* AI Block */
.ai-block {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.ai-block-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-3);
}

.ai-badge {
  font-family: var(--mono);
  font-size: 0.7rem;
  padding: 2px 7px;
  border-radius: 2px;
  background: rgba(247,147,26,0.12);
  color: var(--accent);
  letter-spacing: 0.04em;
}

.ai-label { font-size: 0.78rem; color: var(--text-3); }

.ai-content { padding: 16px; min-height: 80px; }

.ai-text {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text);
  display: none;
}
.ai-text.visible { display: block; }

.ai-error { font-size: 0.82rem; color: var(--red); }

/* Skeleton */
.ai-skeleton { display: flex; flex-direction: column; gap: 8px; }
.skel-line {
  height: 12px;
  background: var(--bg-4);
  border-radius: 2px;
  animation: shimmer 1.4s ease infinite;
}
.w80 { width: 80%; }
.w60 { width: 60%; }
.w90 { width: 90%; }

@keyframes shimmer {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0.8; }
}

/* Summary Block */
.summary-block, .io-block {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-3);
}

.block-title { font-family: var(--mono); font-size: 0.75rem; color: var(--text-3); letter-spacing: 0.04em; }

.status-chip {
  font-family: var(--mono);
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 2px;
  letter-spacing: 0.04em;
}
.status-chip.confirmed { background: rgba(61,153,112,0.12); color: var(--green); }
.status-chip.unconfirmed { background: rgba(247,147,26,0.1); color: var(--accent); }

.summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.summary-row {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
}
.summary-row:nth-child(even) { border-right: none; }
.summary-row:nth-last-child(-n+2) { border-bottom: none; }

.summary-key { font-family: var(--mono); font-size: 0.68rem; color: var(--text-3); letter-spacing: 0.06em; text-transform: uppercase; }
.summary-val { font-family: var(--mono); font-size: 0.85rem; color: var(--text); }
.summary-note { font-size: 0.72rem; color: var(--text-2); font-family: var(--sans); }

/* IO Block */
.io-block {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: start;
  gap: 0;
}

.io-panel { min-width: 0; }
.io-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-3);
}
.io-title { font-family: var(--mono); font-size: 0.75rem; color: var(--text-3); letter-spacing: 0.04em; }
.io-count { font-family: var(--mono); font-size: 0.72rem; color: var(--text-3); }

.io-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 14px 4px;
  color: var(--text-3);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  align-self: stretch;
  background: var(--bg-3);
}

.io-list { padding: 8px 0; }

.io-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 16px;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.io-item:last-child { border-bottom: none; }
.io-item:hover { background: var(--bg-3); }

.io-addr {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-2);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.io-addr.coinbase { color: var(--accent); }
.io-amount { font-family: var(--mono); font-size: 0.8rem; color: var(--text); }
.io-amount-usd { font-size: 0.7rem; color: var(--text-3); font-family: var(--sans); }

/* Raw Block */
.raw-block {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.raw-summary {
  padding: 10px 16px;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-3);
  letter-spacing: 0.04em;
  cursor: pointer;
  background: var(--bg-3);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  user-select: none;
  transition: color var(--transition);
}
.raw-summary:hover { color: var(--text-2); }
.raw-summary::before { content: '▶'; font-size: 0.6rem; transition: transform var(--transition); }
details[open] .raw-summary::before { transform: rotate(90deg); }

.raw-pre {
  padding: 16px;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-2);
  overflow-x: auto;
  line-height: 1.6;
  background: var(--bg-2);
  white-space: pre;
  max-height: 400px;
  overflow-y: auto;
}

/* Loading */
.loading-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 80px 0;
}

.loading-spinner {
  width: 28px; height: 28px;
  border: 2px solid var(--border-2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-text { font-family: var(--mono); font-size: 0.78rem; color: var(--text-3); }

/* Error */
.error-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 80px 0;
  text-align: center;
}
.error-icon { font-size: 1.5rem; color: var(--text-3); }
.error-msg { color: var(--text-2); font-size: 0.88rem; max-width: 400px; }
.btn-retry {
  background: none;
  border: 1px solid var(--border-2);
  color: var(--text-2);
  padding: 8px 20px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.82rem;
  font-family: var(--sans);
  transition: all var(--transition);
}
.btn-retry:hover { border-color: var(--text-3); color: var(--text); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: auto;
}
.footer-inner {
  max-width: 780px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.75rem;
  color: var(--text-3);
  flex-wrap: wrap;
}
.footer-sep { color: var(--border-2); }

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 600px) {
  .hero { padding: 48px 0 32px; }
  .summary-grid { grid-template-columns: 1fr; }
  .summary-row { border-right: none; }
  .summary-row:nth-last-child(-n+2) { border-bottom: 1px solid var(--border); }
  .summary-row:last-child { border-bottom: none; }
  .io-block { grid-template-columns: 1fr; }
  .io-arrow { display: none; }
  .tx-id-value { max-width: 180px; }
  .settings-panel { width: 100%; }
}

/* ── Chain Selector ────────────────────────────────────────── */
.chain-selector {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
}

.chain-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  color: var(--text-2);
  padding: 8px 16px;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 400;
  transition: all var(--transition);
}
.chain-btn:hover { border-color: var(--border-2); color: var(--text); }
.chain-btn.active {
  border-color: var(--accent-dim);
  color: var(--accent);
  background: rgba(247,147,26,0.07);
}
.chain-icon { flex-shrink: 0; opacity: 0.8; }
.chain-btn.active .chain-icon { opacity: 1; }

/* ── Chain Chip (in TX bar) ────────────────────────────────── */
.chain-chip {
  font-family: var(--mono);
  font-size: 0.68rem;
  padding: 2px 7px;
  border-radius: 2px;
  letter-spacing: 0.06em;
  flex-shrink: 0;
}
.chain-chip.btc { background: rgba(247,147,26,0.12); color: var(--accent); }
.chain-chip.eth { background: rgba(98,126,234,0.12); color: #8899ee; }

/* ── Status chip — reverted ────────────────────────────────── */
.status-chip.reverted { background: rgba(192,57,43,0.12); color: var(--red); }

/* ── Toast ─────────────────────────────────────────────────── */
.toast {
  position: fixed;
  top: 68px;
  left: 50%;
  transform: translateX(-50%) translateY(-12px);
  background: var(--bg-4);
  border: 1px solid var(--border-2);
  color: var(--text);
  font-family: var(--sans);
  font-size: 0.82rem;
  padding: 10px 18px;
  border-radius: var(--radius);
  box-shadow: 0 4px 24px rgba(0,0,0,0.4);
  white-space: nowrap;
  max-width: calc(100vw - 48px);
  overflow: hidden;
  text-overflow: ellipsis;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease, transform 200ms ease;
  z-index: 999;
}
.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}
.toast.toast-error {
  border-color: var(--red);
  color: #e07070;
}