:root {
  --green-900: #0f2b1a;
  --green-800: #143922;
  --green-700: #1a4a2e;
  --green-600: #226b3d;
  --green-500: #2d8a4e;
  --green-300: #5cbf7c;
  --amber-500: #f59e0b;
  --amber-400: #fbbf24;
  --amber-100: #fef3c7;
  --gray-50: #f8faf9;
  --gray-100: #f0f2f1;
  --gray-200: #dce0dd;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --white: #ffffff;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  color: var(--gray-800);
  background: var(--gray-50);
  line-height: 1.7;
}

a { color: var(--green-600); }
a:hover { color: var(--green-500); }

/* ===== HEADER ===== */
.site-header {
  background: linear-gradient(135deg, var(--green-900) 0%, var(--green-700) 100%);
  color: var(--white);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-lg);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  color: var(--white);
  text-decoration: none;
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo span { color: var(--amber-400); }

.logo-icon { font-size: 1.6rem; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--white);
  font-size: 1.5rem;
  cursor: pointer;
}

.main-nav { display: flex; gap: 4px; }

.main-nav a {
  color: var(--gray-200);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s;
}

.main-nav a:hover,
.main-nav a.active {
  background: rgba(255,255,255,0.12);
  color: var(--white);
}

/* ===== HERO (home) ===== */
.hero {
  background: linear-gradient(135deg, var(--green-900) 0%, #0d3320 50%, var(--green-700) 100%);
  color: var(--white);
  padding: 80px 24px;
  text-align: center;
}

.hero-content h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -1px;
}

.hero-content h1 span { color: var(--amber-400); }

.hero-content p {
  font-size: 1.15rem;
  color: var(--gray-200);
  max-width: 650px;
  margin: 0 auto 24px;
}

.hero-meta {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  font-size: 0.95rem;
  color: var(--gray-400);
}

/* ===== CONTAINER ===== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== SECTIONS ===== */
.section { padding: 60px 0; }
.section-light { background: var(--white); }

.section-title {
  font-size: 1.6rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 8px;
  color: var(--gray-900);
}

.section-subtitle {
  text-align: center;
  color: var(--gray-500);
  margin-bottom: 40px;
  font-size: 1rem;
}

/* ===== CARD GRID ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}

.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: all 0.25s;
  border: 1px solid var(--gray-200);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--green-300);
}

.card-image {
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-image.inversores { background: linear-gradient(135deg, #1e3a5f, #3b82f6); }
.card-image.baterias { background: linear-gradient(135deg, #3b0764, #8b5cf6); }
.card-image.paneles { background: linear-gradient(135deg, #064e3b, #10b981); }

.emoji-icon { font-size: 3.5rem; }

.card-body { padding: 24px; }

.card-category {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.inversores .card-category { background: #dbeafe; color: #1e40af; }
.baterias .card-category { background: #ede9fe; color: #6b21a8; }
.paneles .card-category { background: #dcfce7; color: #166534; }

.card-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.4;
}

.card-title a {
  color: var(--gray-900);
  text-decoration: none;
}
.card-title a:hover { color: var(--green-600); }

.card-text {
  color: var(--gray-600);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 16px;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--gray-500);
  padding-top: 12px;
  border-top: 1px solid var(--gray-100);
}

.card-link {
  color: var(--green-600);
  text-decoration: none;
  font-weight: 600;
}
.card-link:hover { text-decoration: underline; }

/* ===== CATEGORY PAGE ===== */
.category-hero {
  padding: 60px 24px;
  text-align: center;
  color: var(--white);
}

.category-hero.inversores { background: linear-gradient(135deg, #1e3a5f, #1e40af); }
.category-hero.baterias { background: linear-gradient(135deg, #3b0764, #7c3aed); }
.category-hero.paneles { background: linear-gradient(135deg, #064e3b, #059669); }

.category-hero h1 { font-size: 2rem; margin-bottom: 8px; }
.category-hero p { opacity: 0.85; max-width: 600px; margin: 0 auto; font-size: 1rem; }

/* Category-specific card grid on cat pages */
.cat-articles .card-grid { margin-top: 0; }

/* ===== ARTICLE PAGE ===== */
.article-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 0 60px;
}

.article-header { margin-bottom: 32px; }

.breadcrumbs {
  font-size: 0.85rem;
  color: var(--gray-500);
  margin-bottom: 20px;
}

.breadcrumbs a {
  color: var(--green-600);
  text-decoration: none;
}
.breadcrumbs a:hover { text-decoration: underline; }

.breadcrumbs .sep {
  margin: 0 6px;
  color: var(--gray-400);
}

.article-header h1 {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--gray-900);
}

.article-meta {
  color: var(--gray-500);
  font-size: 0.9rem;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--gray-200);
}

.article-body h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 36px 0 12px;
  color: var(--green-800);
}

.article-body h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 24px 0 8px;
  color: var(--gray-800);
}

.article-body p { margin-bottom: 16px; color: var(--gray-700); }

.article-body ul, .article-body ol {
  margin: 0 0 16px 24px;
  color: var(--gray-700);
}

.article-body li { margin-bottom: 8px; }

.article-body strong { color: var(--gray-900); }

.article-body .tip-box {
  background: var(--amber-100);
  border-left: 4px solid var(--amber-500);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
}

.article-body .tip-box p:last-child { margin-bottom: 0; }

/* Tags */
.tag-list {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--gray-200);
}

.tag {
  display: inline-block;
  font-size: 0.75rem;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--gray-100);
  color: var(--gray-600);
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--green-900);
  color: var(--gray-200);
  padding: 48px 24px;
}

.footer-grid {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
}

.footer-col h3 {
  color: var(--amber-400);
  font-size: 1rem;
  margin-bottom: 16px;
}

.footer-col p {
  font-size: 0.9rem;
  color: var(--gray-400);
  line-height: 1.6;
}

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

.footer-col ul li { margin-bottom: 10px; }

.footer-col ul a {
  color: var(--gray-400);
  text-decoration: none;
  font-size: 0.9rem;
}
.footer-col ul a:hover { color: var(--amber-400); }

.footer-bottom {
  max-width: 1100px;
  margin: 32px auto 0;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.08);
  text-align: center;
  font-size: 0.85rem;
  color: var(--gray-500);
}

.footer-bottom .brand { color: var(--amber-400); font-weight: 600; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .header-inner { height: auto; padding: 12px 16px; }
  .nav-toggle { display: block; }
  .main-nav {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--green-800);
    padding: 8px;
    gap: 2px;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 10px 16px; }

  .hero { padding: 48px 16px; }
  .hero-content h1 { font-size: 1.7rem; }
  .hero-content p { font-size: 1rem; }
  .hero-meta { flex-direction: column; gap: 8px; }

  .section { padding: 40px 0; }
  .card-grid { grid-template-columns: 1fr; gap: 20px; }

  .article-page { padding: 24px 0 40px; }
  .article-header h1 { font-size: 1.5rem; }

  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
}

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}