/* ============================================================
   CSCode — Calculadora de Preços da API Oficial do WhatsApp
   Token system
   ============================================================ */

:root {
  --paper: #F5F7F5;
  --surface: #FFFFFF;
  --ink: #10190F;
  --ink-soft: #57655C;
  --ink-faint: #8A968E;
  --line: #DDE5DD;
  --line-strong: #C7D2C6;

  --whatsapp: #25D366;
  --whatsapp-deep: #148A48;
  --whatsapp-tint: #E7F9EE;

  --meta-blue: #0668E1;
  --meta-blue-tint: #E9F1FD;

  --auth: #A9762E;
  --auth-tint: #F6EEE1;

  --service: #9AA79D;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'IBM Plex Mono', 'SFMono-Regular', Menlo, monospace;

  --shadow-card: 0 1px 2px rgba(16, 25, 15, 0.04), 0 8px 24px -12px rgba(16, 25, 15, 0.10);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }

a { color: inherit; text-decoration: none; }

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 28px;
}

:focus-visible {
  outline: 2px solid var(--whatsapp-deep);
  outline-offset: 3px;
}

/* subtle paper texture, kept extremely quiet */
.noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
  background-image: radial-gradient(circle at 1px 1px, rgba(16,25,15,0.035) 1px, transparent 0);
  background-size: 22px 22px;
}

/* ============================== Header ============================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(245, 247, 245, 0.85);
  backdrop-filter: saturate(140%);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--ink);
  flex-shrink: 0;
}

.brand-mark {
  display: inline-flex;
  object-fit: contain;
  flex-shrink: 0;
}

.header-nav {
  display: flex;
  gap: 26px;
  margin-right: auto;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--ink-soft);
}

.header-nav a { transition: color 0.15s var(--ease); }
.header-nav a:hover { color: var(--ink); }

.header-cta {
  background: var(--ink);
  color: var(--paper);
  font-size: 14px;
  font-weight: 600;
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  transition: background 0.15s var(--ease);
  white-space: nowrap;
}

.header-cta:hover { background: var(--whatsapp-deep); }

@media (max-width: 760px) {
  .header-nav { display: none; }
}

/* ============================== Hero ============================== */

.hero {
  position: relative;
  z-index: 1;
  padding: 64px 0 44px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: end;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--whatsapp-deep);
  margin: 0 0 16px;
}

.hero-copy h1 {
  font-family: var(--font-display);
  font-size: clamp(32px, 4.2vw, 50px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  font-weight: 500;
  margin: 0 0 20px;
  max-width: 15ch;
}

.hero-copy h1 em {
  font-style: italic;
  color: var(--whatsapp-deep);
}

.hero-sub {
  font-size: 17px;
  color: var(--ink-soft);
  max-width: 46ch;
  margin: 0;
}

.rate-chips {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.rate-chips li {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-size: 13px;
  color: var(--ink-soft);
}

.rate-chips strong {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.rate-chips small {
  font-size: 11.5px;
  color: var(--ink-faint);
}

.chip-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  margin-bottom: 2px;
}

.dot-marketing { background: var(--whatsapp); }
.dot-utility { background: var(--meta-blue); }
.dot-auth { background: var(--auth); }
.dot-service { background: var(--service); }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .rate-chips { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 620px) {
  .rate-chips { grid-template-columns: repeat(2, 1fr); }
}

/* ============================== Calculator ============================== */

.calculator {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 28px;
  padding: 20px 28px 72px;
  align-items: start;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.inputs-panel { padding: 32px 32px 20px; }

.panel-title {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 500;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}

.panel-hint {
  color: var(--ink-soft);
  font-size: 14.5px;
  margin: 0 0 28px;
}

.field {
  border-top: 1px solid var(--line);
  padding: 22px 0;
}

.field:first-of-type { border-top: none; padding-top: 0; }

.field-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
}

.field-head label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 15.5px;
}

.field-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
}

.field-rate {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-soft);
  white-space: nowrap;
}

.field-rate-free {
  color: var(--whatsapp-deep);
  font-weight: 600;
}

.field-desc {
  font-size: 13.5px;
  color: var(--ink-faint);
  margin: 0 0 16px;
  max-width: 52ch;
}

.field-control {
  display: grid;
  grid-template-columns: 1fr 108px;
  gap: 16px;
  align-items: center;
}

.field-control-simple {
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: 180px;
}

.prefix {
  font-family: var(--font-mono);
  color: var(--ink-soft);
  font-size: 14px;
}

input[type="number"] {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  padding: 9px 10px;
  width: 100%;
  text-align: right;
  transition: border-color 0.15s var(--ease);
}

input[type="number"]:hover { border-color: var(--ink-faint); }
input[type="number"]:focus { border-color: var(--whatsapp-deep); outline: none; }

/* range slider */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 4px;
  background: var(--line-strong);
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--surface);
  border: 2.5px solid var(--whatsapp-deep);
  cursor: pointer;
  transition: transform 0.12s var(--ease);
}

input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.12); }

input[type="range"]::-moz-range-thumb {
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--surface);
  border: 2.5px solid var(--whatsapp-deep);
  cursor: pointer;
}

[data-field="utility"] input[type="range"]::-webkit-slider-thumb { border-color: var(--meta-blue); }
[data-field="utility"] input[type="range"]::-moz-range-thumb { border-color: var(--meta-blue); }
[data-field="auth"] input[type="range"]::-webkit-slider-thumb { border-color: var(--auth); }
[data-field="auth"] input[type="range"]::-moz-range-thumb { border-color: var(--auth); }
[data-field="service"] input[type="range"]::-webkit-slider-thumb { border-color: var(--service); }
[data-field="service"] input[type="range"]::-moz-range-thumb { border-color: var(--service); }

.field-muted { opacity: 0.9; }

.optional-tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  color: var(--ink-faint);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 2px 6px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.field-extra { border-top: 1px solid var(--line); }

.assumptions {
  margin-top: 8px;
  border-top: 1px solid var(--line);
  padding: 18px 0 6px;
  font-size: 13px;
}

.assumptions summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--ink-soft);
  list-style: none;
}

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

.assumptions summary::before {
  content: "+ ";
  color: var(--whatsapp-deep);
  font-weight: 700;
}

.assumptions[open] summary::before { content: "− "; }

.assumptions p {
  color: var(--ink-faint);
  margin: 10px 0 4px;
  line-height: 1.6;
}

.assumptions a { color: var(--meta-blue); text-decoration: underline; text-underline-offset: 2px; }

/* ---------- summary panel ---------- */

.summary-panel { align-self: start; position: sticky; top: 92px; }

.summary-sticky { padding: 30px 30px 26px; }

.total-display {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-top: 4px;
}

.total-currency {
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--ink-soft);
  font-weight: 500;
}

.total-number {
  font-family: var(--font-mono);
  font-size: 46px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.total-caption {
  font-size: 13px;
  color: var(--ink-faint);
  margin: 2px 0 22px;
}

.cost-meter {
  display: flex;
  height: 10px;
  width: 100%;
  border-radius: 6px;
  overflow: hidden;
  background: var(--line);
  margin-bottom: 24px;
}

.cost-meter-segment {
  height: 100%;
  width: 0%;
  transition: width 0.45s var(--ease);
}

.seg-marketing { background: var(--whatsapp); }
.seg-utility { background: var(--meta-blue); }
.seg-auth { background: var(--auth); }

.breakdown {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  border-top: 1px solid var(--line);
}

.breakdown li {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 10px;
  align-items: center;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13.5px;
}

.breakdown-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

.breakdown-qty {
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 12.5px;
  text-align: right;
}

.breakdown-value {
  font-family: var(--font-mono);
  font-weight: 600;
  text-align: right;
  min-width: 84px;
}

.breakdown-free .breakdown-value { color: var(--whatsapp-deep); }
.breakdown-platform .breakdown-label { color: var(--ink-soft); font-weight: 500; }

.summary-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 24px;
}

.stat-label {
  display: block;
  font-size: 11.5px;
  color: var(--ink-faint);
  margin-bottom: 4px;
  line-height: 1.3;
}

.stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 600;
}

.summary-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--whatsapp-deep);
  color: #fff;
  font-weight: 600;
  font-size: 15px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  transition: background 0.15s var(--ease), transform 0.15s var(--ease);
}

.summary-cta:hover { background: #0F723A; transform: translateY(-1px); }
.summary-cta svg { transition: transform 0.15s var(--ease); }
.summary-cta:hover svg { transform: translate(2px, -2px); }

.summary-footnote {
  font-size: 12px;
  color: var(--ink-faint);
  text-align: center;
  margin: 12px 0 0;
}

@media (max-width: 940px) {
  .calculator { grid-template-columns: 1fr; }
  .summary-panel { position: static; }
}

/* ============================== Context section ============================== */

.context {
  position: relative;
  z-index: 1;
  padding: 12px 28px 88px;
}

.context-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  border-top: 1px solid var(--line-strong);
  padding-top: 44px;
}

.context h2 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 500;
  margin: 0 0 10px;
}

.context p {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.65;
  margin: 0;
}

.context strong { color: var(--ink); }

@media (max-width: 760px) {
  .context-grid { grid-template-columns: 1fr; gap: 32px; }
}

/* ============================== Footer ============================== */

.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  background: var(--surface);
  padding: 44px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
}

.brand-footer { margin-bottom: 8px; }

.footer-inner p {
  color: var(--ink-faint);
  font-size: 13px;
  max-width: 40ch;
  margin: 0;
}

.footer-legal {
  max-width: 34ch;
  text-align: right;
}

@media (max-width: 700px) {
  .footer-inner { flex-direction: column; }
  .footer-legal { text-align: left; }
}