/* ─────────────────────────────────────────────
   Discount & Installment Calculator — Stylesheet
   Design: editorial / refined utilitarian
   ───────────────────────────────────────────── */

/* ── Tokens ── */
:root {
  --clr-bg:        #f0ede8;
  --clr-surface:   #ffffff;
  --clr-border:    #dedad4;
  --clr-text:      #1c1917;
  --clr-muted:     #78716c;
  --clr-accent:    #0f4c81;
  --clr-accent-lt: #e8f0fa;
  --clr-green:     #166534;
  --clr-green-lt:  #dcfce7;
  --clr-error:     #991b1b;

  --radius-sm:  8px;
  --radius-md:  14px;
  --radius-lg:  20px;

  --shadow-sm:  0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md:  0 4px 16px rgba(0,0,0,.10), 0 2px 6px rgba(0,0,0,.06);
  --shadow-lg:  0 20px 50px rgba(0,0,0,.12), 0 8px 20px rgba(0,0,0,.08);

  --font-sans:  'Sora', system-ui, sans-serif;
  --font-mono:  'DM Mono', 'Courier New', monospace;

  --transition: .18s ease;
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.6;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px 16px 0;
  /* subtle grid texture */
  background-image:
    linear-gradient(var(--clr-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--clr-border) 1px, transparent 1px);
  background-size: 32px 32px;
}

/* ── Layout ── */
.container {
  width: 100%;
  max-width: 860px;
  background: var(--clr-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: fadeUp .4s ease both;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Header ── */
.app-header {
  padding: 36px 40px 28px;
  border-bottom: 1px solid var(--clr-border);
  background: var(--clr-accent);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.app-header::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.25);
  color: rgba(255,255,255,.9);
  padding: 3px 10px;
  border-radius: 100px;
  margin-bottom: 12px;
}

h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -.02em;
  color: #fff;
}

h1 em {
  font-style: normal;
  color: #93c5fd;
}

.subtitle {
  margin-top: 10px;
  font-size: .9rem;
  color: rgba(255,255,255,.7);
  max-width: 480px;
}

/* ── Form ── */
form {
  padding: 32px 40px;
  border-bottom: 1px solid var(--clr-border);
}

.fields-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}

.campo {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

label {
  font-size: .82rem;
  font-weight: 600;
  color: var(--clr-text);
  display: flex;
  align-items: center;
  gap: 4px;
}

.unit {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--clr-muted);
  font-weight: 400;
}

.field-hint {
  font-size: .72rem;
  color: var(--clr-muted);
  line-height: 1.4;
}

input[type="number"] {
  font-family: var(--font-mono);
  font-size: 1rem;
  padding: 10px 14px;
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-sm);
  background: #fafaf9;
  color: var(--clr-text);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  -moz-appearance: textfield;
  appearance: textfield;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button { display: none; }

input[type="number"]:focus {
  outline: none;
  border-color: var(--clr-accent);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(15, 76, 129, .12);
}

input[type="number"].invalid {
  border-color: var(--clr-error);
  box-shadow: 0 0 0 3px rgba(153, 27, 27, .1);
}

/* ── Buttons ── */
.form-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

.btn-calc,
.btn-reset {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 0;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: var(--font-sans);
  font-weight: 600;
  transition: transform var(--transition), filter var(--transition), box-shadow var(--transition);
}

.btn-calc {
  padding: 12px 28px;
  background: var(--clr-accent);
  color: #fff;
  font-size: 1rem;
  box-shadow: 0 2px 8px rgba(15,76,129,.35);
}

.btn-calc:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(15,76,129,.4);
}

.btn-calc:active { transform: translateY(0); filter: brightness(.95); }

.btn-reset {
  padding: 11px 20px;
  background: transparent;
  border: 1.5px solid var(--clr-border);
  color: var(--clr-muted);
  font-size: .9rem;
}

.btn-reset:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
  background: var(--clr-accent-lt);
}

.error-msg {
  margin-top: 14px;
  font-size: .85rem;
  color: var(--clr-error);
  min-height: 1.2em;
  font-weight: 500;
}

/* ── Result Cards ── */
.resultados {
  padding: 32px 40px;
  border-bottom: 1px solid var(--clr-border);
  animation: fadeIn .3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

h2 {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--clr-muted);
  margin-bottom: 18px;
}

.cards-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
}

.card {
  background: #fafaf9;
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.card--highlight {
  background: var(--clr-accent-lt);
  border-color: var(--clr-accent);
}

.card--savings {
  background: var(--clr-green-lt);
  border-color: #bbf7d0;
}

.card-label {
  font-size: .75rem;
  font-weight: 600;
  color: var(--clr-muted);
  letter-spacing: .04em;
  text-transform: uppercase;
}

.card--highlight .card-label { color: var(--clr-accent); }
.card--savings  .card-label { color: var(--clr-green); }

.card-value {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--clr-text);
  letter-spacing: -.01em;
}

.card--highlight .card-value { color: var(--clr-accent); }
.card--savings  .card-value { color: var(--clr-green); }

/* ── Table ── */
#tabelaSecao {
  padding: 32px 40px;
  animation: fadeIn .3s ease;
}

.table-scroll {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--clr-border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: .85rem;
}

thead th {
  background: #f5f4f2;
  color: var(--clr-muted);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  padding: 12px 16px;
  text-align: right;
  border-bottom: 1.5px solid var(--clr-border);
  white-space: nowrap;
}

thead th:first-child { text-align: center; }

tbody td {
  font-family: var(--font-mono);
  padding: 10px 16px;
  text-align: right;
  border-bottom: 1px solid #f0ede8;
  color: var(--clr-text);
  transition: background var(--transition);
}

tbody td:first-child {
  text-align: center;
  color: var(--clr-muted);
  font-weight: 500;
}

tbody tr:last-child td { border-bottom: none; }

tbody tr:hover td { background: var(--clr-accent-lt); }

tfoot td {
  font-family: var(--font-mono);
  font-weight: 700;
  padding: 12px 16px;
  text-align: right;
  background: #f5f4f2;
  border-top: 1.5px solid var(--clr-border);
  font-size: .82rem;
}

tfoot td:first-child { text-align: center; color: var(--clr-muted); }

.table-note {
  margin-top: 12px;
  font-size: .75rem;
  color: var(--clr-muted);
}

/* ── Footer ── */
.app-footer {
  width: 100%;
  max-width: 860px;
  text-align: center;
  padding: 20px 16px 32px;
  font-size: .8rem;
  color: var(--clr-muted);
}

.app-footer a {
  color: var(--clr-accent);
  text-decoration: none;
  font-weight: 600;
}

.app-footer a:hover { text-decoration: underline; }

/* ── Responsive ── */
@media (max-width: 600px) {
  body { padding: 16px 8px 0; }

  .app-header,
  form,
  .resultados,
  #tabelaSecao { padding-left: 20px; padding-right: 20px; }

  h1 { font-size: 1.5rem; }

  .form-actions { flex-direction: column; align-items: stretch; }

  .btn-calc, .btn-reset { justify-content: center; }
}

/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}