/* ==============================================================================
   Algeobras - Estilos Globales (CSS Puro)
   ============================================================================== */

:root {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-border: #e2e8f0;
  --color-border-subtle: #cbd5e1;
  --color-text-main: #0f172a;
  --color-text-muted: #475569;
  --color-text-light: #64748b;
  --color-dark: #09090b;
  --color-dark-surface: #18181b;
  --color-dark-border: #27272a;
  --color-accent: #f59e0b;
  --color-accent-hover: #d97706;
  --color-accent-dark: #b45309;
  --color-success: #166534;
  --color-success-bg: #dcfce7;
  --color-error: #991b1b;
  --color-error-bg: #fee2e2;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --container-max: 1200px;
}

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

html {
  font-family: var(--font-sans);
  color: var(--color-text-main);
  background-color: var(--color-bg);
  line-height: 1.6;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font: inherit;
}

/* Tipografía y Contenedores */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section-padding {
  padding-top: 5rem;
  padding-bottom: 5rem;
}

.section-header {
  margin-bottom: 3rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent-dark);
  margin-bottom: 0.5rem;
}

.section-tag.light {
  color: var(--color-accent);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.2;
  color: var(--color-text-main);
}

.section-title.light {
  color: #ffffff;
}

.section-subtitle {
  margin-top: 0.75rem;
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 48rem;
}

.section-subtitle.light {
  color: #d4d4d8;
}

/* Botones */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9375rem;
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  cursor: pointer;
  border: 1px solid transparent;
  text-align: center;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-dark);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  color: #ffffff;
}

.btn-secondary {
  background-color: transparent;
  border-color: #52525b;
  color: #f4f4f5;
}

.btn-secondary:hover {
  border-color: #a1a1aa;
  background-color: rgba(255, 255, 255, 0.05);
}

.btn-dark {
  background-color: var(--color-dark);
  color: #ffffff;
}

.btn-dark:hover {
  background-color: var(--color-accent-hover);
  color: #ffffff;
}

/* Header & Navegación */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.75rem;
}

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

.brand-logo-img {
  height: 2.75rem;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text-main);
  transition: color 0.2s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-accent-dark);
}

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 600;
  color: var(--color-text-main);
}

/* Banner de Página */
.page-banner {
  background-color: var(--color-dark);
  color: #ffffff;
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--color-dark-border);
}

/* Tarjetas y Rejillas */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.5rem;
}

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.card-img-wrap {
  position: relative;
  aspect-ratio: 16 / 10;
  background-color: var(--color-dark-surface);
  overflow: hidden;
}

.card-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.card:hover .card-img-wrap img {
  transform: scale(1.04);
}

.card-badge {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  background-color: rgba(9, 9, 11, 0.9);
  color: var(--color-accent);
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
}

.card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-meta {
  font-size: 0.75rem;
  color: var(--color-text-light);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.75rem;
  color: var(--color-text-main);
}

.card-text {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.card-footer {
  margin-top: auto;
  border-top: 1px solid var(--color-border);
  padding-top: 1rem;
}

.card-link {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-accent-dark);
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.card-link:hover {
  color: var(--color-accent);
}

/* Hero Section */
.hero-section {
  background-color: var(--color-dark);
  color: #ffffff;
  padding: 5rem 0 4rem 0;
  border-bottom: 1px solid var(--color-dark-border);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-content h1 {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-top: 1rem;
  margin-bottom: 1.5rem;
}

.hero-content p {
  font-size: 1.125rem;
  line-height: 1.7;
  color: #cbd5e1;
  margin-bottom: 2rem;
  max-width: 38rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.hero-visual {
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-dark-surface);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.4);
}

.hero-metrics-bar {
  background-color: rgba(24, 24, 27, 0.7);
  border-top: 1px solid var(--color-dark-border);
  padding: 2.25rem 0;
  margin-top: 3.5rem;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.metric-item .number {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
}

.metric-item .label {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #a1a1aa;
  margin-top: 0.5rem;
}

/* Bloque de Garantías / Confianza */
.trust-banner {
  background-color: var(--color-dark);
  color: #ffffff;
  border-radius: var(--radius-lg);
  padding: 3.5rem;
  border: 1px solid var(--color-dark-border);
}

.trust-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 3rem;
  align-items: center;
}

.guarantees-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.guarantee-card {
  background-color: var(--color-dark-surface);
  border: 1px solid var(--color-dark-border);
  padding: 1.5rem;
  border-radius: var(--radius-md);
}

.guarantee-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.guarantee-card p {
  font-size: 0.8125rem;
  color: #d4d4d8;
  line-height: 1.5;
}

/* Filtros */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
}

.filter-btn {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-main);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-btn:hover {
  border-color: var(--color-text-muted);
}

.filter-btn.active {
  background-color: var(--color-dark);
  color: #ffffff;
  border-color: var(--color-dark);
}

/* Formulario */
.form-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.form-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-main);
  margin-bottom: 0.5rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: #ffffff;
  color: var(--color-text-main);
  font-size: 0.9375rem;
  transition: border-color 0.2s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-dark);
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-top: 1rem;
  margin-bottom: 1.75rem;
}

.checkbox-group input {
  margin-top: 0.25rem;
}

.checkbox-group label {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.form-alert {
  padding: 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
  display: none;
}

.form-alert.success {
  display: block;
  background-color: var(--color-success-bg);
  color: var(--color-success);
  border: 1px solid #bbf7d0;
}

.form-alert.error {
  display: block;
  background-color: var(--color-error-bg);
  color: var(--color-error);
  border: 1px solid #fecaca;
}

/* Modal de Detalle de Proyecto */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  background-color: rgba(9, 9, 11, 0.7);
  backdrop-filter: blur(4px);
  padding: 2rem 1rem;
  overflow-y: auto;
}

.modal-overlay.open {
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-container {
  background-color: #ffffff;
  border-radius: var(--radius-lg);
  max-width: 48rem;
  width: 100%;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: rgba(9, 9, 11, 0.8);
  color: #ffffff;
  border: none;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  font-size: 1.25rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

.modal-body {
  padding: 2rem;
}

/* Footer */
.site-footer {
  margin-top: auto;
  background-color: var(--color-dark);
  color: #d4d4d8;
  border-top: 1px solid var(--color-dark-border);
  padding: 4.5rem 0 2rem 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 3.5rem;
  margin-bottom: 3.5rem;
}

.footer-col h3 {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: 1.25rem;
}

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

.footer-links a {
  color: #a1a1aa;
  font-size: 0.9375rem;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-contact li {
  font-size: 0.9375rem;
  color: #a1a1aa;
  margin-bottom: 0.75rem;
  line-height: 1.5;
}

.footer-contact strong {
  color: #f4f4f5;
}

.footer-bottom {
  border-top: 1px solid var(--color-dark-border);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  color: #71717a;
}

/* Responsividad */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .trust-grid {
    grid-template-columns: 1fr;
  }
  .guarantees-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: #ffffff;
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.25rem;
    box-shadow: var(--shadow-md);
  }
  .nav-menu.open {
    display: flex;
  }
  .hero-content h1 {
    font-size: 2.25rem;
  }
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
  .guarantees-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  .trust-banner {
    padding: 2rem;
  }
}