:root {
  --bg: #0d0f14;
  --surface: #13161e;
  --surface2: #1a1e28;
  --border: #252a38;
  --accent: #4fffb0;
  --accent2: #3dd6f5;
  --text: #e8eaf0;
  --muted: #6b7280;
  --card-hover: #1e2330;
  --radius: 16px;
  --font-display: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
  opacity: 0.4;
}

body::after {
  content: '';
  position: fixed;
  top: -200px; left: -200px;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(79,255,176,0.06) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ── NAV ── */
nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(13,15,20,0.88);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  height: 64px;
  display: flex; align-items: center; justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-display);
  font-weight: 800; font-size: 1.3rem;
  color: var(--accent); letter-spacing: -0.02em;
  text-decoration: none;
}
.nav-logo span { color: var(--text); }

.nav-links { display: flex; gap: 0.2rem; list-style: none; flex-wrap: wrap; }
.nav-links a {
  color: var(--muted); text-decoration: none;
  font-size: 0.82rem; font-weight: 500;
  padding: 0.35rem 0.65rem; border-radius: 8px;
  transition: all 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); background: var(--surface2); }
.nav-links a.active { color: var(--accent); }

/* ── BREADCRUMB ── */
.breadcrumb {
  position: relative; z-index: 1;
  max-width: 860px; margin: 1.5rem auto 0;
  padding: 0 2rem;
  font-size: 0.82rem; color: var(--muted);
}
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { margin: 0 0.4rem; }

/* ── HERO (index) ── */
.hero {
  position: relative; z-index: 1;
  text-align: center;
  padding: 5rem 2rem 3.5rem;
  max-width: 820px; margin: 0 auto;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 0.4rem;
  background: rgba(79,255,176,0.08);
  border: 1px solid rgba(79,255,176,0.2);
  color: var(--accent); font-size: 0.78rem; font-weight: 600;
  padding: 0.35rem 0.9rem; border-radius: 100px;
  margin-bottom: 1.5rem; letter-spacing: 0.05em; text-transform: uppercase;
  animation: fadeUp 0.5s ease both;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 800; line-height: 1.1;
  letter-spacing: -0.03em; margin-bottom: 1.25rem;
  animation: fadeUp 0.5s 0.1s ease both;
}
.hero h1 .highlight {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero p {
  font-size: 1.05rem; color: var(--muted);
  max-width: 520px; margin: 0 auto 2.5rem;
  font-weight: 300; animation: fadeUp 0.5s 0.2s ease both;
}
.hero-stats {
  display: flex; justify-content: center; gap: 2.5rem;
  animation: fadeUp 0.5s 0.3s ease both;
}
.stat { text-align: center; }
.stat-num { font-family: var(--font-display); font-size: 1.5rem; font-weight: 800; color: var(--accent); }
.stat-label { font-size: 0.78rem; color: var(--muted); }

/* ── PAGE HERO (subpages) ── */
.page-hero {
  position: relative; z-index: 1;
  max-width: 860px; margin: 0 auto;
  padding: 2.5rem 2rem 2rem;
}
.page-hero-icon {
  display: block;
  width: 64px;
  height: 64px;
  margin-bottom: 1rem;
  border-radius: 16px;
  overflow: hidden;
  background: var(--surface2);
  border: 1px solid var(--border);
}
.page-hero-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800; line-height: 1.15;
  letter-spacing: -0.03em; margin-bottom: 0.6rem;
  animation: fadeUp 0.4s ease both;
}
.page-hero p {
  font-size: 1rem; color: var(--muted);
  max-width: 580px; font-weight: 300;
  animation: fadeUp 0.4s 0.1s ease both;
}

/* ── AD SLOTS ── */
/* TODO: Cuando Google AdSense apruebe la web, elimina las tres líneas "display: none"
   que hay debajo (una en .ad-banner, una en .ad-slot y una en .ad-slot-sq) */
.ad-banner { display: none; position: relative; z-index: 1; max-width: 860px; margin: 1rem auto; padding: 0 2rem; }
.ad-slot {
  display: none;
  background: var(--surface); border: 1px dashed var(--border);
  border-radius: var(--radius); height: 90px;
  align-items: center; justify-content: center;
  color: var(--muted); font-size: 0.78rem;
  letter-spacing: 0.1em; text-transform: uppercase;
}
.ad-slot-sq {
  display: none;
  background: var(--surface); border: 1px dashed var(--border);
  border-radius: var(--radius); height: 250px;
  align-items: center; justify-content: center;
  color: var(--muted); font-size: 0.78rem;
  letter-spacing: 0.1em; text-transform: uppercase;
}

/* ── TOOLS GRID (index) ── */
.section { position: relative; z-index: 1; max-width: 1100px; margin: 0 auto; padding: 0 2rem 4rem; }
.section-title {
  font-family: var(--font-display); font-size: 0.72rem; font-weight: 700;
  color: var(--muted); letter-spacing: 0.15em; text-transform: uppercase; margin-bottom: 1.25rem;
}
.tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1rem; }
.tool-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem;
  text-decoration: none; display: block;
  transition: all 0.25s; position: relative; overflow: hidden;
}
.tool-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transform: scaleX(0); transform-origin: left; transition: transform 0.3s ease;
}
.tool-card:hover { background: var(--card-hover); border-color: rgba(79,255,176,0.2); transform: translateY(-2px); box-shadow: 0 8px 32px rgba(0,0,0,0.3); }
.tool-card:hover::before { transform: scaleX(1); }
/* ── CARD ICON → IMAGE CONTAINER ── */
.card-icon {
  display: block;
  width: 100px;
  height: 60px;
  margin-bottom: 1rem;
  border-radius: 12px;
  overflow: hidden;
  background: var(--surface2);
  border: 1px solid var(--border);
  flex-shrink: 0;
}

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

.tool-card:hover .card-icon img {
  transform: scale(1.08);
}

/* Placeholder shown when no image is set */
.card-icon:not(:has(img))::after,
.card-icon img[src=""]::before {
  content: '';
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--surface2), var(--border));
}

/* Icon placeholder visual — shows a subtle "image" icon */
.card-icon-placeholder {
  display: block;
  width: 52px;
  height: 52px;
  margin-bottom: 1rem;
  border-radius: 12px;
  background: var(--surface2);
  border: 1.5px dashed var(--border);
  position: relative;
  flex-shrink: 0;
}
.card-icon-placeholder::after {
  content: '🖼';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.4rem;
  opacity: 0.3;
}
.card-title { font-family: var(--font-display); font-size: 1rem; font-weight: 700; margin-bottom: 0.4rem; color: var(--text); }
.card-desc { font-size: 0.84rem; color: var(--muted); line-height: 1.5; }
.card-arrow { position: absolute; top: 1.25rem; right: 1.25rem; color: var(--muted); font-size: 1.1rem; transition: transform 0.2s, color 0.2s; }
.tool-card:hover .card-arrow { transform: translateX(3px); color: var(--accent); }

/* ── CALC LAYOUT ── */
.calc-layout {
  position: relative; z-index: 1;
  max-width: 860px; margin: 0 auto;
  padding: 0 2rem 1rem;
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 1.5rem;
  align-items: start;
}

.calc-main { display: flex; flex-direction: column; gap: 1.5rem; }

/* ── CALC CARD ── */
.calc-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 2rem;
  position: relative; overflow: hidden;
}
.calc-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
}
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 1rem; margin-bottom: 1.5rem; }
.form-group { display: flex; flex-direction: column; gap: 0.4rem; }
.form-group label { font-size: 0.78rem; font-weight: 600; color: var(--muted); letter-spacing: 0.05em; text-transform: uppercase; }
.form-group input, .form-group select {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 10px; color: var(--text);
  font-family: var(--font-body); font-size: 1rem;
  padding: 0.7rem 1rem; outline: none; transition: border-color 0.2s; width: 100%;
}
.form-group input:focus, .form-group select:focus {
  border-color: var(--accent); box-shadow: 0 0 0 3px rgba(79,255,176,0.08);
}
.form-group select option { background: var(--bg); }

.calc-btn {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border: none; border-radius: 10px; color: #0d0f14;
  cursor: pointer; font-family: var(--font-display);
  font-size: 0.95rem; font-weight: 700;
  padding: 0.85rem 2.5rem; transition: opacity 0.2s, transform 0.1s;
  letter-spacing: 0.02em;
}
.calc-btn:hover { opacity: 0.9; transform: translateY(-1px); }
.calc-btn:active { transform: translateY(0); }

/* ── RESULT BOX ── */
.result-box {
  display: none; background: var(--bg);
  border: 1px solid rgba(79,255,176,0.2); border-radius: var(--radius);
  padding: 1.5rem; animation: fadeUp 0.3s ease;
}
.result-box.visible { display: block; }
.result-title { font-size: 0.72rem; font-weight: 700; color: var(--accent); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 1rem; }
.results-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 1rem; }
.result-label { font-size: 0.8rem; color: var(--muted); margin-bottom: 0.2rem; }
.result-value { font-family: var(--font-body); font-size: 1.35rem; font-weight: 700; color: var(--text); letter-spacing: -0.01em; }
.result-value.big { font-family: var(--font-body); font-size: 2rem; font-weight: 700; color: var(--accent); letter-spacing: -0.02em; }
.result-note { margin-top: 1rem; font-size: 0.8rem; color: var(--muted); line-height: 1.5; padding-top: 1rem; border-top: 1px solid var(--border); }

/* ── SIDEBAR ── */
.calc-sidebar { display: flex; flex-direction: column; gap: 1rem; }
.sidebar-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; }
.sidebar-card h3 { font-family: var(--font-display); font-size: 0.85rem; font-weight: 700; color: var(--text); margin-bottom: 0.75rem; }
.sidebar-links { list-style: none; display: flex; flex-direction: column; gap: 0.4rem; }
.sidebar-links a { color: var(--muted); text-decoration: none; font-size: 0.85rem; padding: 0.3rem 0; display: flex; align-items: center; gap: 0.5rem; transition: color 0.2s; }
.sidebar-links a:hover { color: var(--accent); }

/* ── SEO ARTICLE ── */
.seo-article {
  position: relative; z-index: 1;
  max-width: 860px; margin: 0 auto;
  padding: 0 2rem 3rem;
}
.seo-article h2 { font-family: var(--font-display); font-size: 1.3rem; font-weight: 700; margin: 2rem 0 0.75rem; color: var(--text); }
.seo-article h3 { font-family: var(--font-display); font-size: 1rem; font-weight: 700; margin: 1.5rem 0 0.5rem; color: var(--text); }
.seo-article p { color: var(--muted); font-size: 0.95rem; line-height: 1.75; margin-bottom: 0.75rem; }
.seo-article ul { color: var(--muted); font-size: 0.95rem; line-height: 1.75; padding-left: 1.25rem; margin-bottom: 0.75rem; }
.seo-article ul li { margin-bottom: 0.3rem; }
.faq-item { border-top: 1px solid var(--border); padding: 1rem 0; }
.faq-item summary { cursor: pointer; font-weight: 600; color: var(--text); font-size: 0.95rem; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq-item summary::after { content: '+'; color: var(--accent); font-size: 1.2rem; }
.faq-item[open] summary::after { content: '−'; }
.faq-item p { margin-top: 0.75rem; color: var(--muted); font-size: 0.9rem; }

/* ── FOOTER ── */
footer {
  position: relative; z-index: 1;
  border-top: 1px solid var(--border);
  padding: 2rem; text-align: center;
  color: var(--muted); font-size: 0.84rem;
}
footer a { color: var(--accent); text-decoration: none; }
.footer-links { display: flex; justify-content: center; gap: 1.5rem; margin-bottom: 1rem; flex-wrap: wrap; }

/* ── ANIMATIONS ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── MOBILE ── */
@media (max-width: 720px) {
  nav { padding: 0 1rem; }
  .nav-links { display: none; }
  .hero, .page-hero { padding-left: 1rem; padding-right: 1rem; }
  .section, .seo-article, .ad-banner { padding-left: 1rem; padding-right: 1rem; }
  .calc-layout { grid-template-columns: 1fr; padding: 0 1rem 1rem; }
  .calc-sidebar { display: none; }
  .tools-grid { grid-template-columns: 1fr 1fr; gap: 0.75rem; }
  .tool-card { padding: 1rem; }
  .card-desc { display: none; }
  .hero-stats { gap: 1.5rem; }
}

/* ── HAMBURGER MENU (móvil) ── */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 0.3rem 0.6rem;
  line-height: 1;
  transition: background 0.2s, border-color 0.2s;
}
.nav-toggle:hover {
  background: var(--surface2);
  border-color: var(--accent);
}

@media (max-width: 720px) {
  .nav-toggle { display: block; }

  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 64px; left: 0; right: 0;
    background: rgba(13,15,20,0.97);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1rem 1rem;
    gap: 0.25rem;
    z-index: 99;
  }
  .nav-links.open { display: flex; }
  .nav-links a {
    padding: 0.55rem 0.75rem;
    font-size: 0.95rem;
  }
}