/* ================================================================
   ACS CONTABILIDADE - DESIGN SYSTEM
   Paleta: Azuis profissionais com toques de confiança
   ================================================================ */

:root {
  /* Cores Principais */
  --cor-primaria: #1e3a5f;        /* Azul Profundo - Confiança */
  --cor-secundaria: #2c5aa0;      /* Azul Corporativo - Autoridade */
  --cor-terciaria: #3d6cb9;       /* Azul Médio - Clareza */
  --cor-destaque: #0066cc;        /* Azul Vibrante - Ação */
  
  /* Tons de Suporte */
  --cor-cinza-escuro: #2d3436;
  --cor-cinza-medio: #636e72;
  --cor-cinza-claro: #b2bec3;
  --cor-cinza-bg: #f8f9fa;
  --cor-branco: #ffffff;
  
  /* Feedback */
  --cor-sucesso: #00b894;
  --cor-alerta: #fdcb6e;
  --cor-erro: #d63031;
  
  /* Sombras */
  --sombra-sm: 0 2px 8px rgba(30, 58, 95, 0.08);
  --sombra-md: 0 4px 16px rgba(30, 58, 95, 0.12);
  --sombra-lg: 0 8px 32px rgba(30, 58, 95, 0.16);
  
  /* Transições */
  --transicao-rapida: 0.2s ease;
  --transicao-normal: 0.3s ease;
  --transicao-lenta: 0.5s ease;
  
  /* Tipografia */
  --font-stack: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
}

/* ================================================================
   RESET E BASE
   ================================================================ */

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

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

body {
  font-family: var(--font-stack);
  line-height: 1.7;
  color: var(--cor-cinza-escuro);
  background-color: var(--cor-branco);
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transicao-rapida);
}

button {
  font-family: inherit;
  border: none;
  cursor: pointer;
  transition: all var(--transicao-rapida);
}

/* ================================================================
   HEADER E NAVEGAÇÃO
   ================================================================ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: var(--cor-branco);
  box-shadow: var(--sombra-sm);
  z-index: 1000;
  transition: all var(--transicao-normal);
}

.header.scrolled {
  box-shadow: var(--sombra-md);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo {
  height: 50px;
  width: auto;
}

.nav-menu {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-menu a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--cor-cinza-escuro);
  position: relative;
  padding: 0.5rem 0;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--cor-destaque);
  transition: width var(--transicao-normal);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  background: none;
  width: 30px;
  height: 24px;
  position: relative;
}

.nav-toggle span {
  display: block;
  position: absolute;
  height: 3px;
  width: 100%;
  background: var(--cor-primaria);
  border-radius: 2px;
  opacity: 1;
  left: 0;
  transition: all var(--transicao-rapida);
}

.nav-toggle span:nth-child(1) { top: 0; }
.nav-toggle span:nth-child(2) { top: 10px; }
.nav-toggle span:nth-child(3) { top: 20px; }

.nav-toggle.active span:nth-child(1) {
  top: 10px;
  transform: rotate(135deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  top: 10px;
  transform: rotate(-135deg);
}

/* ================================================================
   SEÇÕES GERAIS
   ================================================================ */

section {
  padding: 5rem 2rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 4rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--cor-destaque);
  margin-bottom: 1rem;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--cor-primaria);
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

.section-subtitle {
  font-size: 1.15rem;
  color: var(--cor-cinza-medio);
  line-height: 1.8;
}

/* ================================================================
   HERO CONCEITUAL
   ================================================================ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: url('../assets/hero.svg') center/cover no-repeat;
  position: relative;
  padding: 8rem 2rem 5rem;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(30, 58, 95, 0.92) 0%, rgba(44, 90, 160, 0.88) 100%);
}

.hero-content {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  color: var(--cor-branco);
  text-align: center;
}

.hero-tag {
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  opacity: 0.9;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 2rem;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}

.hero-description {
  font-size: 1.35rem;
  line-height: 1.8;
  max-width: 800px;
  margin: 0 auto 3rem;
  opacity: 0.95;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1.25rem 3rem;
  background: var(--cor-destaque);
  color: var(--cor-branco);
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: 50px;
  box-shadow: 0 8px 24px rgba(0, 102, 204, 0.35);
  transition: all var(--transicao-normal);
}

.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(0, 102, 204, 0.45);
  background: #0052a3;
}

/* ================================================================
   CARDS E GRIDS
   ================================================================ */

.grid {
  display: grid;
  gap: 2.5rem;
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

.card {
  background: var(--cor-branco);
  border-radius: 12px;
  padding: 2.5rem;
  box-shadow: var(--sombra-sm);
  transition: all var(--transicao-normal);
  border: 1px solid transparent;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--sombra-lg);
  border-color: var(--cor-terciaria);
}

.card-icon {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--cor-secundaria), var(--cor-terciaria));
  color: var(--cor-branco);
  border-radius: 12px;
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 12px rgba(44, 90, 160, 0.2);
}

.card-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--cor-primaria);
  margin-bottom: 1rem;
}

.card-text {
  color: var(--cor-cinza-medio);
  line-height: 1.7;
}

/* ================================================================
   TABELAS E LISTAS COMPARATIVAS
   ================================================================ */

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--cor-branco);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--sombra-md);
}

.comparison-table thead {
  background: linear-gradient(135deg, var(--cor-primaria), var(--cor-secundaria));
  color: var(--cor-branco);
}

.comparison-table th {
  padding: 1.25rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.comparison-table td {
  padding: 1.25rem;
  border-bottom: 1px solid var(--cor-cinza-bg);
}

.comparison-table tbody tr:hover {
  background: var(--cor-cinza-bg);
}

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

.check-icon {
  color: var(--cor-sucesso);
  font-weight: 700;
  font-size: 1.2rem;
}

.x-icon {
  color: var(--cor-erro);
  font-weight: 700;
  font-size: 1.2rem;
}

/* ================================================================
   FAQ INTERATIVO
   ================================================================ */

.faq-list {
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  background: var(--cor-branco);
  border-radius: 12px;
  margin-bottom: 1.25rem;
  box-shadow: var(--sombra-sm);
  overflow: hidden;
  border: 1px solid transparent;
  transition: all var(--transicao-rapida);
}

.faq-item:hover {
  border-color: var(--cor-terciaria);
}

.faq-question {
  width: 100%;
  padding: 1.5rem 2rem;
  background: none;
  text-align: left;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--cor-primaria);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.faq-question:hover {
  background: var(--cor-cinza-bg);
}

.faq-icon {
  font-size: 1.5rem;
  transition: transform var(--transicao-normal);
  color: var(--cor-destaque);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transicao-normal);
}

.faq-answer-content {
  padding: 0 2rem 1.5rem;
  color: var(--cor-cinza-medio);
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

/* ================================================================
   FORMULÁRIO DE CONTATO
   ================================================================ */

.contact-form {
  max-width: 700px;
  margin: 0 auto;
  background: var(--cor-branco);
  padding: 3rem;
  border-radius: 16px;
  box-shadow: var(--sombra-lg);
}

.form-group {
  margin-bottom: 1.75rem;
}

.form-label {
  display: block;
  font-weight: 600;
  color: var(--cor-primaria);
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 1rem 1.25rem;
  border: 2px solid var(--cor-cinza-claro);
  border-radius: 8px;
  font-family: inherit;
  font-size: 1rem;
  transition: all var(--transicao-rapida);
  background: var(--cor-branco);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--cor-destaque);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 140px;
}

.form-error {
  color: var(--cor-erro);
  font-size: 0.85rem;
  margin-top: 0.5rem;
  display: none;
}

.form-input.error,
.form-select.error,
.form-textarea.error {
  border-color: var(--cor-erro);
}

.form-input.error + .form-error,
.form-select.error + .form-error,
.form-textarea.error + .form-error {
  display: block;
}

.form-submit {
  width: 100%;
  padding: 1.25rem;
  background: linear-gradient(135deg, var(--cor-secundaria), var(--cor-destaque));
  color: var(--cor-branco);
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0, 102, 204, 0.3);
  transition: all var(--transicao-normal);
}

.form-submit:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0, 102, 204, 0.4);
}

.form-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.form-message {
  margin-top: 1.5rem;
  padding: 1.25rem;
  border-radius: 8px;
  text-align: center;
  font-weight: 500;
  display: none;
}

.form-message.success {
  background: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
  display: block;
}

.form-message.error {
  background: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
  display: block;
}

/* ================================================================
   BACKGROUNDS ALTERNATIVOS
   ================================================================ */

.bg-gray {
  background-color: var(--cor-cinza-bg);
}

.bg-pattern {
  background: url('../assets/pattern.svg') center/cover;
}

.bg-gradient {
  background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
}

/* ================================================================
   RODAPÉ
   ================================================================ */

.footer {
  background: linear-gradient(135deg, var(--cor-primaria) 0%, var(--cor-secundaria) 100%);
  color: var(--cor-branco);
  padding: 3rem 2rem 1.5rem;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
  margin-bottom: 2rem;
}

.footer-section h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  opacity: 0.95;
}

.footer-section p,
.footer-section a {
  font-size: 0.9rem;
  opacity: 0.8;
  line-height: 1.8;
}

.footer-section a:hover {
  opacity: 1;
  text-decoration: underline;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  font-size: 0.75rem;
  opacity: 0.5;
  line-height: 1.4;
}

/* ================================================================
   RESPONSIVIDADE
   ================================================================ */

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }
  
  .nav-menu {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 80px);
    background: var(--cor-branco);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    box-shadow: var(--sombra-lg);
    transition: left var(--transicao-normal);
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .hero {
    padding: 6rem 1.5rem 4rem;
    min-height: 90vh;
  }
  
  .hero-title {
    font-size: 2.25rem;
  }
  
  .hero-description {
    font-size: 1.1rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  section {
    padding: 3.5rem 1.5rem;
  }
  
  .grid {
    gap: 1.5rem;
  }
  
  .card {
    padding: 2rem;
  }
  
  .contact-form {
    padding: 2rem 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.85rem;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .card {
    padding: 1.5rem;
  }
  
  .comparison-table {
    font-size: 0.85rem;
  }
  
  .comparison-table th,
  .comparison-table td {
    padding: 0.875rem;
  }
}