/* Base Styles with Spanish-inspired Natural Aesthetic */
:root {
  /* Natural Earthy Color Palette */
  --color-cream: #f5f1e6;
  --color-sand: #e7dbc6;
  --color-olive: #94a178;
  --color-terracotta: #bb6741;
  --color-navy: #2a3b59;
  --color-stone: #a19888;
  --color-white: #ffffff;
  --color-black: #333333;
  
  /* Font Variables */
  --font-primary: 'Inter', 'Segoe UI', sans-serif;
  --font-display: 'Playfair Display', serif;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  /* Shadows */
  --shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-medium: 0 6px 16px rgba(0, 0, 0, 0.1);
}

/* Reset & Base Elements */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-primary);
  background-color: var(--color-cream);
  color: var(--color-black);
  line-height: 1.6;
  overflow-x: hidden;
}

img {
  max-width: 100%;
}

a {
  text-decoration: none;
  color: var(--color-navy);
  transition: all 0.3s ease;
  cursor: pointer;
  position: relative;
  z-index: 5;
}

a:hover {
  color: var(--color-terracotta);
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* Header Styling */
.site-header {
  background: linear-gradient(to right, var(--color-white), var(--color-cream));
  border-bottom: 1px solid var(--color-sand);
  padding: var(--space-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-soft);
  height: 70px; /* 固定导航栏高度为70px */
  display: flex;
  align-items: center;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  height: 70px; /* 与header高度保持一致 */
}

.logo h1 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-navy);
  margin: 0;
  position: relative;
}

.site-name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-navy);
  font-weight: 600;
}

.flag-icon {
  width: 60px;
  height: auto;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-soft);
  object-fit: contain;
}

.logo a {
  display: flex;
  align-items: center;
  text-decoration: none;
  border: none;
}

.logo a:hover {
  transform: none;
  background: none;
}

.logo a:focus {
  outline: none;
}

/* Mobile menu button - hidden on desktop */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--color-navy);
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
  transition: all 0.3s ease;
}

.mobile-menu-btn:hover {
  background-color: var(--color-sand);
}

.mobile-menu-btn.menu-open {
  background-color: var(--color-sand);
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
}

.nav-links a {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-weight: 500;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  transition: all 0.3s ease;
  position: relative;
  z-index: 10;
  cursor: pointer;
}

.nav-links a.active,
.nav-links a:hover {
  background-color: var(--color-sand);
  color: var(--color-navy);
  transform: translateY(-2px);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy) 50%, var(--color-olive) 100%);
  color: var(--color-white);
  padding: var(--space-xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
  margin-bottom: 40px;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 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='0.1'%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");
  opacity: 0.1;
  pointer-events: none;
  z-index: 0;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: 2.2rem;
  margin-bottom: var(--space-md);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  animation: fadeInUp 1s ease-out;
}

.hero p {
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
  opacity: 0.9;
  animation: fadeInUp 1.2s ease-out;
}

/* Calculator Card */
.calculator-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-medium);
  margin: 40px auto 40px;
  max-width: 800px;
  overflow: hidden;
  transform: translateY(0);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  z-index: 10;
}

.calculator-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.card-header {
  background: linear-gradient(to right, var(--color-olive), var(--color-navy));
  color: var(--color-white);
  padding: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.card-header i {
  font-size: 1.5rem;
  opacity: 0.9;
}

.card-header h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin: 0;
}

.card-body {
  padding: var(--space-xl);
}

/* Input Group */
.input-group {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.input-group input {
  flex: 1;
  min-width: 200px;
  padding: var(--space-md);
  border: 2px solid var(--color-sand);
  border-radius: var(--radius-md);
  font-size: 1.1rem;
  color: var(--color-black);
  background-color: var(--color-cream);
  transition: all 0.3s ease;
}

.input-group input:focus {
  outline: none;
  border-color: var(--color-navy);
  box-shadow: 0 0 0 3px rgba(42, 59, 89, 0.1);
}

.input-group input::placeholder {
  color: var(--color-stone);
}

.btn-primary {
  background: linear-gradient(to right, var(--color-terracotta), #cb7d4f);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  transition: all 0.3s ease;
  box-shadow: 0 4px 8px rgba(187, 103, 65, 0.2);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 12px rgba(187, 103, 65, 0.3);
}

.btn-primary:active {
  transform: translateY(0);
}

/* Resultado */
.resultado {
  min-height: 60px;
  margin-bottom: var(--space-lg);
}

.resultado .success {
  background: linear-gradient(to right, rgba(148, 161, 120, 0.15), rgba(148, 161, 120, 0.05));
  border-left: 4px solid var(--color-olive);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.resultado .success i {
  color: var(--color-olive);
  font-size: 1.5rem;
  margin-bottom: var(--space-xs);
}

.resultado .success strong {
  color: var(--color-navy);
  font-size: 1.3rem;
  letter-spacing: 1px;
}

.result-explanation {
  color: var(--color-stone);
  font-size: 0.95rem;
  margin-bottom: var(--space-md);
  padding-left: var(--space-md);
  border-left: 2px solid var(--color-sand);
}

.resultado .error {
  background: rgba(220, 53, 69, 0.1);
  border-left: 4px solid #dc3545;
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.resultado .error i {
  color: #dc3545;
  font-size: 1.5rem;
}

.input-help {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  color: var(--color-stone);
  font-size: 0.9rem;
}

.input-help i {
  font-size: 1rem;
  color: var(--color-navy);
  opacity: 0.7;
}

/* Info Section */
.info-section {
  margin: var(--space-xl) 0;
}

.card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.feature {
  display: flex;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  background-color: var(--color-cream);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature:last-child {
  margin-bottom: 0;
}

.feature:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-soft);
}

.feature-icon {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-cream), var(--color-white));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-terracotta);
  font-size: 1.3rem;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

.feature-text h3 {
  font-family: var(--font-display);
  margin-bottom: var(--space-sm);
  color: var(--color-navy);
}

/* SEO Article */
.seo-article {
  margin: var(--space-xl) 0;
}

.seo-article .card-body {
  padding: var(--space-xl);
}

.seo-article p {
  margin-bottom: var(--space-lg);
  line-height: 1.8;
}

.seo-article strong {
  color: var(--color-navy);
}

.seo-article h3 {
  font-family: var(--font-display);
  color: var(--color-navy);
  margin: var(--space-xl) 0 var(--space-md);
  font-size: 1.3rem;
}

/* DNI Table Styles */
.dni-table {
  overflow-x: auto;
  margin: var(--space-lg) 0;
  background: linear-gradient(to right, rgba(148, 161, 120, 0.1), rgba(148, 161, 120, 0.05));
  padding: var(--space-md);
  border-radius: var(--radius-md);
}

.letra-table {
  width: 100%;
  border-collapse: collapse;
  border-radius: var(--radius-sm);
  overflow: hidden;
  font-size: 0.95rem;
}

.letra-table th {
  background-color: var(--color-navy);
  color: var(--color-white);
  text-align: center;
  padding: var(--space-sm);
  font-weight: 600;
}

.letra-table td {
  text-align: center;
  padding: var(--space-sm);
  border: 1px solid var(--color-sand);
}

.letra-table tr:nth-child(even) {
  background-color: rgba(255, 255, 255, 0.7);
}

.letra-table tr:nth-child(odd) {
  background-color: rgba(255, 255, 255, 0.4);
}

/* Example Box */
.example-box {
  background: linear-gradient(to right, rgba(42, 59, 89, 0.1), rgba(42, 59, 89, 0.05));
  border-left: 4px solid var(--color-navy);
  padding: var(--space-md);
  margin: var(--space-lg) 0;
  border-radius: var(--radius-sm);
}

.example-box p {
  margin-bottom: 0;
}

/* FAQ Section */
.faq-section {
  margin: var(--space-xl) 0;
}

.accordion {
  margin-top: var(--space-lg);
}

.accordion-item {
  border-bottom: 1px solid var(--color-sand);
}

.accordion-header {
  padding: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.accordion-header:hover {
  background-color: var(--color-cream);
}

.accordion-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0;
  flex: 1;
}

.accordion-header i.fa-question {
  color: var(--color-navy);
  font-size: 1rem;
  opacity: 0.7;
}

.accordion-header i.fa-chevron-down {
  color: var(--color-stone);
  transition: transform 0.3s ease;
}

.accordion-item.active .accordion-header i.fa-chevron-down {
  transform: rotate(180deg);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  padding: 0 var(--space-lg);
}

.accordion-item.active .accordion-content {
  max-height: 200px;
  padding-bottom: var(--space-lg);
}

/* Footer */
.site-footer {
  background: linear-gradient(to right, var(--color-navy), #364a6e);
  color: var(--color-white);
  padding: var(--space-xl) 0 var(--space-lg);
  margin-top: var(--space-xl);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 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='0.05'%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");
  opacity: 0.1;
  pointer-events: none;
  z-index: 0;
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.footer-column {
  flex: 1;
  min-width: 200px;
}

.footer-column h3 {
  font-family: var(--font-display);
  color: var(--color-cream);
  margin-bottom: var(--space-lg);
  position: relative;
  padding-bottom: var(--space-sm);
}

.footer-column h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background-color: var(--color-terracotta);
}

.footer-column p,
.footer-column ul li {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.95rem;
}

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

.footer-column ul li {
  margin-bottom: var(--space-sm);
}

.footer-column ul li a {
  color: rgba(255, 255, 255, 0.8);
  transition: all 0.3s ease;
  position: relative;
  z-index: 10;
  display: inline-block;
  cursor: pointer;
}

.footer-column ul li a:hover {
  color: var(--color-white);
  text-decoration: underline;
}

.footer-bottom {
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}

.footer-bottom p {
  font-size: 0.85rem;
  opacity: 0.7;
}

/* Legal Content Styling */
.legal-content {
  line-height: 1.8;
}

.legal-content h3 {
  font-family: var(--font-display);
  color: var(--color-navy);
  margin: var(--space-xl) 0 var(--space-md);
  font-size: 1.4rem;
  border-bottom: 1px solid var(--color-sand);
  padding-bottom: var(--space-sm);
}

.legal-content h4 {
  font-family: var(--font-display);
  color: var(--color-navy);
  margin: var(--space-lg) 0 var(--space-sm);
  font-size: 1.2rem;
}

.legal-content p, 
.legal-content li {
  margin-bottom: var(--space-md);
  color: var(--color-black);
}

.legal-content ul {
  padding-left: 1.5rem;
  margin-bottom: var(--space-lg);
}

.legal-content a {
  color: var(--color-terracotta);
  text-decoration: underline;
  position: relative;
  z-index: 5;
  cursor: pointer;
}

.legal-content a:hover {
  color: var(--color-navy);
}

/* Animations */
@keyframes fadeInUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Media Queries for Responsive Design */
@media (max-width: 768px) {
  .site-header .container {
    flex-direction: row;
    flex-wrap: wrap;
    position: relative;
  }
  
  .mobile-menu-btn {
    display: block;
    order: 2;
  }
  
  .main-nav {
    width: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    order: 3;
    margin-top: 0;
  }
  
  .main-nav.nav-open {
    max-height: 300px;
    margin-top: var(--space-md);
    z-index: 100;
  }
  
  .nav-links {
    flex-direction: column;
    width: 100%;
    gap: 0;
    margin-top: var(--space-sm);
    background-color: var(--color-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-soft);
    padding: var(--space-md) 0;
    position: relative;
    z-index: 100;
  }
  
  .nav-links a {
    padding: var(--space-md);
    width: 100%;
    border-radius: 0;
    position: relative;
    display: block;
  }
  
  .nav-links a:hover {
    transform: none;
    background-color: var(--color-cream);
  }
  
  .hero h1, 
  .hero h2 {
    font-size: 1.8rem;
  }
  
  .input-group {
    flex-direction: column;
  }
  
  .card-header {
    padding: var(--space-md);
  }
  
  .card-body {
    padding: var(--space-lg);
  }
  
  .feature {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-md);
  }
  
  .footer-content {
    flex-direction: column;
    gap: var(--space-xl);
  }
}

@media (max-width: 480px) {
  .nav-links {
    gap: var(--space-sm);
  }
  
  .hero h1, 
  .hero h2 {
    font-size: 1.5rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .input-group input,
  .btn-primary {
    width: 100%;
  }
  
  .accordion-header {
    padding: var(--space-md);
  }
  
  .accordion-header h3 {
    font-size: 1rem;
  }
}