/* ============ Trocador Unit Converter — Styles ============ */
:root {
  --primary: #0ea5e9;
  --primary-dark: #0369a1;
  --accent: #22c55e;
  --dark: #0f172a;
  --gray: #64748b;
  --light: #f1f5f9;
  --white: #ffffff;
  --border: #e2e8f0;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--dark);
  background: var(--white);
  line-height: 1.65;
}

.container {
  width: 90%;
  max-width: 1080px;
  margin: 0 auto;
}

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

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
}

.logo {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: 0.5px;
}

.logo span {
  color: var(--accent);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 24px;
}

.nav-links a {
  text-decoration: none;
  color: var(--dark);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--primary);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.6rem;
  cursor: pointer;
  color: var(--dark);
}

/* ============ Hero ============ */
.hero {
  background: linear-gradient(135deg, #e0f2fe 0%, #dcfce7 100%);
  padding: 64px 0 48px;
  text-align: center;
}

.hero h1 {
  font-size: 2.6rem;
  line-height: 1.2;
  margin-bottom: 14px;
}

.hero h1 span {
  color: var(--primary);
}

.hero p {
  font-size: 1.1rem;
  color: var(--gray);
  max-width: 600px;
  margin: 0 auto;
}

/* ============ Converter ============ */
.converter-section {
  padding: 48px 0 64px;
}

.converter {
  max-width: 720px;
  margin: -80px auto 0;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  position: relative;
  z-index: 5;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
  justify-content: center;
}

.tab {
  padding: 10px 18px;
  border: 1px solid var(--border);
  background: var(--light);
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--gray);
  transition: all 0.15s;
}

.tab:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.tab.active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--white);
}

.converter-body {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 16px;
  align-items: end;
}

.field label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gray);
  margin-bottom: 6px;
}

.field input,
.field select {
  width: 100%;
  padding: 13px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 1.05rem;
  font-family: inherit;
  background: var(--white);
  color: var(--dark);
}

.field input:focus,
.field select:focus {
  outline: 2px solid var(--primary);
  border-color: transparent;
}

.field input {
  margin-bottom: 10px;
}

.swap-btn {
  align-self: center;
  margin-bottom: 10px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--light);
  font-size: 1.2rem;
  cursor: pointer;
  transition: all 0.15s;
  color: var(--primary);
}

.swap-btn:hover {
  background: var(--primary);
  color: var(--white);
  transform: rotate(180deg);
}

.result-line {
  margin-top: 22px;
  padding: 16px 18px;
  background: var(--light);
  border-radius: 10px;
  text-align: center;
  font-size: 1.05rem;
  color: var(--dark);
}

.result-line strong {
  color: var(--primary);
}

/* ============ Common conversions ============ */
.common {
  background: var(--light);
}

.common h2,
.info-section h2 {
  text-align: center;
  font-size: 1.8rem;
  margin-bottom: 8px;
}

.common .sub,
.info-section .sub {
  text-align: center;
  color: var(--gray);
  margin-bottom: 36px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
}

.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}

.card h3 {
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.card p {
  color: var(--gray);
  font-size: 0.92rem;
}

/* ============ Info section ============ */
.info-section {
  padding: 64px 0;
}

/* ============ Inner pages ============ */
.page-header {
  background: var(--light);
  text-align: center;
  padding: 52px 0;
}

.page-header h1 {
  font-size: 2.1rem;
}

.page-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 52px 0;
}

.page-content h2 {
  margin: 30px 0 12px;
  font-size: 1.35rem;
}

.page-content p,
.page-content li {
  color: #334155;
  margin-bottom: 12px;
}

.page-content ul {
  padding-left: 24px;
}

/* ============ Contact form ============ */
.contact-form {
  max-width: 560px;
  margin: 0 auto;
  background: var(--light);
  padding: 34px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  background: var(--white);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: 2px solid var(--primary);
  border-color: transparent;
}

.form-msg {
  margin-top: 16px;
  font-weight: 600;
  display: none;
}

.form-msg.success {
  display: block;
  color: #059669;
}

.form-msg.error {
  display: block;
  color: #dc2626;
}

/* ============ Footer ============ */
footer {
  background: var(--dark);
  color: #cbd5e1;
  padding: 44px 0 22px;
  margin-top: 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  margin-bottom: 30px;
}

.footer-grid h4 {
  color: var(--white);
  margin-bottom: 14px;
}

.footer-grid ul {
  list-style: none;
}

.footer-grid ul li {
  margin-bottom: 8px;
}

.footer-grid a {
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.92rem;
}

.footer-grid a:hover {
  color: var(--white);
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 18px;
  text-align: center;
  font-size: 0.85rem;
  color: #94a3b8;
}

/* ============ Responsive ============ */
@media (max-width: 620px) {
  .converter-body {
    grid-template-columns: 1fr;
  }

  .swap-btn {
    justify-self: center;
    transform: rotate(90deg);
  }

  .swap-btn:hover {
    transform: rotate(270deg);
  }

  .hero h1 {
    font-size: 2rem;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 16px 5%;
    border-bottom: 1px solid var(--border);
    gap: 14px;
  }

  .nav-links.open {
    display: flex;
  }
}