/* FormaPreço — calculadora pública */
:root {
  --ink: #13212b;
  --ink-soft: #3a4a56;
  --muted: #6b7c88;
  --paper: #f3f6f4;
  --surface: rgba(255, 255, 255, 0.82);
  --surface-solid: #ffffff;
  --line: rgba(19, 33, 43, 0.1);
  --accent: #0f766e;
  --accent-deep: #0a5c56;
  --accent-soft: #d8f0ec;
  --warn: #b45309;
  --err: #b91c1c;
  --ok: #047857;
  --shadow: 0 18px 50px rgba(19, 33, 43, 0.08);
  --radius: 18px;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --sans: "Manrope", system-ui, sans-serif;
  --display: "Syne", "Manrope", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(15, 118, 110, 0.18), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(19, 33, 43, 0.08), transparent 50%),
    linear-gradient(180deg, #e8efec 0%, var(--paper) 40%, #eef2f0 100%);
  line-height: 1.45;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.035'/%3E%3C/svg%3E");
  opacity: 0.5;
  z-index: 0;
}

a {
  color: var(--accent-deep);
}

.shell {
  position: relative;
  z-index: 1;
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.75rem 0 3.5rem;
}

/* Header / brand */
.brand {
  display: grid;
  gap: 0.85rem;
  margin-bottom: 1.75rem;
  animation: rise 0.55s ease both;
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(1.85rem, 4vw, 2.55rem);
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--ink);
}

.brand__dot {
  width: 0.72rem;
  height: 0.72rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 6px var(--accent-soft);
  animation: pulse 2.4s ease-in-out infinite;
}

.brand__lead {
  max-width: 34rem;
  margin: 0;
  color: var(--ink-soft);
  font-size: 1.02rem;
}

.brand__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.28rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.55);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
}

/* Layout */
.layout {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 920px) {
  .layout {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: start;
  }
}

.panel {
  background: var(--surface);
  backdrop-filter: blur(10px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem 1.35rem 1.4rem;
  animation: rise 0.6s ease both;
}

.panel--results {
  animation-delay: 0.08s;
}

.panel__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.panel__title {
  margin: 0;
  font-family: var(--display);
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.panel__hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

/* Mode switch */
.mode-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
  padding: 0.3rem;
  border-radius: 14px;
  background: rgba(19, 33, 43, 0.05);
  margin-bottom: 1.1rem;
}

.mode-switch button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  font: inherit;
  font-weight: 650;
  font-size: 0.9rem;
  padding: 0.7rem 0.6rem;
  border-radius: 11px;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.mode-switch button[aria-pressed="true"] {
  background: var(--surface-solid);
  color: var(--ink);
  box-shadow: 0 4px 14px rgba(19, 33, 43, 0.08);
}

.mode-switch button:hover {
  color: var(--ink);
}

/* Forms */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem 0.85rem;
}

.field {
  display: grid;
  gap: 0.28rem;
}

.field--full {
  grid-column: 1 / -1;
}

.field label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--muted);
}

.field input,
.field select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-solid);
  color: var(--ink);
  font: inherit;
  font-size: 0.98rem;
  padding: 0.7rem 0.8rem;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.field input.mono,
.mono {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

.field input:focus,
.field select:focus {
  border-color: rgba(15, 118, 110, 0.55);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.15);
}

.field .help {
  font-size: 0.75rem;
  color: var(--muted);
}

.section-label {
  grid-column: 1 / -1;
  margin: 0.55rem 0 0;
  font-family: var(--display);
  font-size: 0.95rem;
  color: var(--ink);
}

details.advanced {
  grid-column: 1 / -1;
  border-top: 1px solid var(--line);
  margin-top: 0.4rem;
  padding-top: 0.7rem;
}

details.advanced summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--ink-soft);
  list-style: none;
}

details.advanced summary::-webkit-details-marker {
  display: none;
}

details.advanced summary::after {
  content: "+";
  float: right;
  color: var(--accent);
  font-weight: 700;
}

details.advanced[open] summary::after {
  content: "−";
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1rem;
}

.btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 12px;
  font: inherit;
  font-weight: 700;
  padding: 0.7rem 1rem;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn--primary {
  background: var(--accent);
  color: #fff;
}

.btn--primary:hover {
  background: var(--accent-deep);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink-soft);
}

.btn--ghost:hover {
  border-color: rgba(19, 33, 43, 0.25);
  color: var(--ink);
}

/* Results */
.status {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--muted);
}

.status--ok { color: var(--ok); }
.status--err { color: var(--err); }

.hero-result {
  padding: 1rem 1.05rem 1.15rem;
  border-radius: 16px;
  background:
    linear-gradient(145deg, rgba(15, 118, 110, 0.12), rgba(255, 255, 255, 0.7) 55%),
    var(--surface-solid);
  border: 1px solid rgba(15, 118, 110, 0.18);
  margin-bottom: 1rem;
}

.hero-result__label {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.hero-result__value {
  margin: 0.2rem 0 0;
  font-family: var(--mono);
  font-size: clamp(1.7rem, 4vw, 2.25rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.hero-result.is-updating .hero-result__value {
  opacity: 0.35;
  transform: translateY(2px);
}

.metric-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
  margin-bottom: 1rem;
}

.metric {
  padding: 0.75rem 0.85rem;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
}

.metric__label {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--muted);
  margin-bottom: 0.2rem;
}

.metric__value {
  font-family: var(--mono);
  font-size: 1.02rem;
  font-weight: 600;
}

.alert {
  display: none;
  margin: 0 0 0.9rem;
  padding: 0.75rem 0.85rem;
  border-radius: 12px;
  background: #fff1f1;
  border: 1px solid rgba(185, 28, 28, 0.2);
  color: var(--err);
  font-size: 0.9rem;
}

.alert.is-visible {
  display: block;
}

.tabs {
  display: flex;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
}

.tabs button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-weight: 700;
  font-size: 0.85rem;
  padding: 0.4rem 0.65rem;
  border-radius: 999px;
  cursor: pointer;
}

.tabs button[aria-selected="true"] {
  background: var(--accent-soft);
  color: var(--accent-deep);
}

.tab-panel[hidden] {
  display: none;
}

.dre-table,
.steps-list {
  width: 100%;
  border-collapse: collapse;
}

.dre-table th,
.dre-table td {
  padding: 0.45rem 0.2rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.9rem;
}

.dre-table th {
  text-align: left;
  font-weight: 600;
  color: var(--ink-soft);
}

.dre-table td {
  text-align: right;
  font-family: var(--mono);
}

.step {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.75rem 0.85rem;
  background: rgba(255, 255, 255, 0.65);
  margin-bottom: 0.55rem;
}

.step__top {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  align-items: baseline;
}

.step__title {
  margin: 0;
  font-weight: 700;
  font-size: 0.92rem;
}

.step__value {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 0.92rem;
  white-space: nowrap;
}

.step__formula {
  margin: 0.4rem 0 0;
  font-size: 0.78rem;
  color: var(--muted);
}

.step__calc {
  margin: 0.25rem 0 0;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
  word-break: break-word;
}

.footnote {
  margin: 1.1rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.st-only[hidden],
.sem-st-only[hidden] {
  display: none !important;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.08); opacity: 0.85; }
}

@media (max-width: 640px) {
  .form-grid,
  .metric-grid {
    grid-template-columns: 1fr;
  }

  .shell {
    width: min(100% - 1.25rem, 1120px);
  }
}