/* =========================================================================
   Fuel Consumption API — Front-end
   ========================================================================= */

:root {
  --bg: #0e1117;
  --bg-card: #161b22;
  --bg-card-2: #1c232c;
  --border: #2a313c;
  --border-strong: #3a424e;
  --text: #e6edf3;
  --text-muted: #8b95a4;
  --text-dim: #5b6470;
  --primary: #4ea1ff;
  --primary-hover: #6db3ff;
  --primary-soft: rgba(78, 161, 255, 0.15);
  --success: #3fb950;
  --warning: #d29922;
  --danger: #f85149;
  --danger-soft: rgba(248, 81, 73, 0.12);
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  --radius: 10px;
  --radius-sm: 6px;
  --transition: 0.18s ease;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fa;
    --bg-card: #ffffff;
    --bg-card-2: #f0f3f6;
    --border: #d0d7de;
    --border-strong: #afb8c1;
    --text: #1f2328;
    --text-muted: #57606a;
    --text-dim: #8b95a4;
    --primary: #0969da;
    --primary-hover: #0860c7;
    --primary-soft: rgba(9, 105, 218, 0.1);
    --success: #1a7f37;
    --warning: #9a6700;
    --danger: #cf222e;
    --danger-soft: rgba(207, 34, 46, 0.1);
    --shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter",
    Roboto, Helvetica, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============================== TOPBAR ============================== */
.topbar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
}

.topbar-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.brand { display: flex; align-items: center; gap: 14px; }
.brand-mark {
  font-size: 28px;
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  background: var(--primary-soft);
  border-radius: 10px;
}
.brand h1 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.brand-sub {
  margin: 0;
  font-size: 12px;
  color: var(--text-muted);
}

.local-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: var(--primary-soft);
  border: 1px solid var(--primary);
  border-radius: 999px;
  color: var(--primary);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.01em;
  user-select: none;
}
.local-dot {
  font-size: 14px;
  line-height: 1;
  animation: pulse 1.6s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ============================== LAYOUT ============================== */
.layout {
  flex: 1;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 24px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 20px;
}

@media (max-width: 980px) {
  .layout { grid-template-columns: 1fr; }
  .local-badge { font-size: 11px; padding: 4px 10px; }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

/* ============================== FORM ============================== */
.form-card { padding: 12px 8px; }

fieldset.group {
  border: none;
  border-top: 1px solid var(--border);
  padding: 18px 16px 4px;
  margin: 0;
}
fieldset.group:first-of-type { border-top: none; padding-top: 8px; }

legend {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  padding: 0 8px;
  margin-left: -8px;
}

.row {
  display: grid;
  gap: 12px;
  margin-bottom: 12px;
}
.row.two { grid-template-columns: 1fr 1fr; }
.row.three { grid-template-columns: 1fr 1fr 1fr; }
@media (max-width: 560px) {
  .row.two, .row.three { grid-template-columns: 1fr; }
}

label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}
label.check {
  flex-direction: row;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  margin-top: 18px;
}
label.check input { width: auto; }
label.check span { font-weight: 500; }

input[type="number"],
input[type="url"],
input[type="text"],
select {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  color: var(--text);
  font-size: 13px;
  font-family: inherit;
  width: 100%;
  transition: border-color var(--transition), box-shadow var(--transition);
}
input:focus, select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}
input::placeholder { color: var(--text-dim); }
input:invalid:not(:placeholder-shown) { border-color: var(--danger); }

.advanced {
  margin: 8px 0 4px;
}
.advanced > summary {
  cursor: pointer;
  user-select: none;
  font-size: 12px;
  color: var(--text-muted);
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.advanced > summary::-webkit-details-marker { display: none; }
.advanced > summary::before {
  content: "▸";
  font-size: 10px;
  transition: transform var(--transition);
  display: inline-block;
}
.advanced[open] > summary::before { transform: rotate(90deg); }
.advanced > summary:hover { background: var(--bg-card-2); color: var(--text); }

.advanced[open] > .row,
.advanced[open] > .hint,
.advanced[open] > .elev-points { margin-top: 10px; }

.hint {
  font-size: 12px;
  color: var(--text-dim);
  margin: 4px 0 8px;
  padding: 0 8px;
  line-height: 1.5;
}

/* Elevation points editor */
.elev-points { display: flex; flex-direction: column; gap: 6px; padding: 4px 8px; }
.elev-row {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 8px;
  align-items: center;
}
.elev-row input { padding: 6px 8px; font-size: 12px; }
.elev-row button {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: 28px; height: 28px;
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  padding: 0;
  transition: background var(--transition);
}
.elev-row button:hover { background: var(--danger-soft); }

/* Buttons */
.actions {
  display: flex;
  gap: 10px;
  padding: 16px;
  position: sticky;
  bottom: 0;
  background: linear-gradient(to top, var(--bg-card) 80%, transparent);
  margin-top: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background var(--transition), border-color var(--transition), transform 0.05s;
  font-family: inherit;
}
.btn:active { transform: translateY(1px); }
.btn.primary {
  background: var(--primary);
  color: white;
  flex: 1;
}
.btn.primary:hover { background: var(--primary-hover); }
.btn.primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}
.btn.ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: var(--border);
}
.btn.ghost:hover { background: var(--bg-card-2); color: var(--text); }
.btn.ghost.danger:hover { color: var(--danger); border-color: var(--danger); }

/* ============================== RESULT ============================== */
.result-card {
  min-height: 480px;
  display: flex;
  flex-direction: column;
}

.empty-state, .error-state {
  margin: auto;
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
}
.empty-icon { font-size: 48px; display: block; margin-bottom: 12px; }
.empty-state h2, .error-state h2 {
  margin: 0 0 8px;
  font-size: 18px;
  color: var(--text);
  font-weight: 600;
}
.empty-state p { margin: 0; max-width: 320px; margin-inline: auto; }

.error-state pre {
  text-align: left;
  background: var(--bg);
  border: 1px solid var(--danger);
  border-radius: var(--radius-sm);
  padding: 12px;
  font-size: 12px;
  color: var(--danger);
  white-space: pre-wrap;
  max-height: 240px;
  overflow: auto;
  margin: 16px 0 0;
}

.hidden { display: none !important; }

/* Tarja de aviso não-fatal (ex: valor recuperado do cache). */
.soft-warning {
  background: var(--primary-soft);
  border: 1px solid var(--primary);
  color: var(--primary);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  margin-bottom: 16px;
  line-height: 1.4;
}

.result-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}
.result-header h2 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}
.badge {
  background: var(--primary-soft);
  color: var(--primary);
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}
.metric {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 92px;
}
.metric.primary {
  background: var(--primary-soft);
  border-color: var(--primary);
}
.metric-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  font-weight: 600;
}
.metric-value {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
.metric.primary .metric-value { color: var(--primary); }
.metric-sub {
  font-size: 12px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.chart-block { margin-bottom: 20px; }
.chart-block h3 {
  margin: 0 0 4px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}
.chart-block .hint { padding: 0 0 12px; }
.chart-wrap {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  height: 280px;
}

.extras {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 18px;
}
.extra {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
}
.extra h3 {
  margin: 0 0 2px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  font-weight: 600;
}
.extra p {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.warnings {
  background: var(--danger-soft);
  border: 1px solid var(--danger);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-bottom: 18px;
}
.warnings h3 {
  margin: 0 0 8px;
  font-size: 13px;
  color: var(--danger);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.warnings ul { margin: 0; padding-left: 20px; }
.warnings li { color: var(--text); font-size: 13px; margin-bottom: 4px; }

.table-wrap {
  max-height: 300px;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  margin-top: 10px;
}
#segments-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}
#segments-table th,
#segments-table td {
  padding: 6px 10px;
  text-align: right;
  border-bottom: 1px solid var(--border);
}
#segments-table th:first-child,
#segments-table td:first-child { text-align: left; }
#segments-table th {
  background: var(--bg-card-2);
  position: sticky;
  top: 0;
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}
#segments-table tr:hover td { background: var(--bg-card-2); }

/* ============================== FOOTER ============================== */
.footer {
  padding: 20px 24px;
  text-align: center;
  color: var(--text-dim);
  font-size: 12px;
  border-top: 1px solid var(--border);
  background: var(--bg-card);
}
.footer a {
  color: var(--text-muted);
  text-decoration: none;
}
.footer a:hover { color: var(--primary); }
.footer .sep { margin: 0 8px; }

/* Loading state */
.btn.primary[data-loading="true"]::after {
  content: "";
  display: inline-block;
  width: 12px; height: 12px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: white;
  border-radius: 50%;
  margin-left: 8px;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }