/* ─────────────────────────────────────────────
   styles.css — Estilos compartidos
   Las Calculadoras · lascalculadoras.es
───────────────────────────────────────────── */

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

/* ── DARK THEME (default) ── */
:root,
[data-theme="dark"] {
  --bg: #0a0f1e;
  --surface: #111827;
  --surface2: #1a2236;
  --border: #1f2d45;
  --accent: #00d4aa;
  --accent2: #f59e0b;
  --accent3: #818cf8;
  --text: #e2e8f0;
  --text-soft: #94a3b8;
  --muted: #64748b;
  --danger: #f87171;
  --info-bg: rgba(129,140,248,0.08);
  --info-border: rgba(129,140,248,0.2);
  --info-text: #a5b4fc;
  --badge-bg: rgba(0,212,170,0.15);
  --badge-border: rgba(0,212,170,0.3);
  --hero-badge-bg: rgba(0,212,170,0.08);
  --hero-badge-border: rgba(0,212,170,0.2);
  --gradient-1: rgba(0,212,170,0.06);
  --gradient-2: rgba(129,140,248,0.06);
  --gradient-3: rgba(245,158,11,0.03);
  --btn-text: #0a0f1e;
  --row-hover: rgba(255,255,255,0.02);
  --td-border: rgba(31,45,69,0.5);
}

/* ── LIGHT THEME ── */
[data-theme="light"] {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface2: #f1f5f9;
  --border: #e2e8f0;
  --accent: #00957a;
  --accent2: #d97706;
  --accent3: #4f46e5;
  --text: #0f172a;
  --text-soft: #475569;
  --muted: #64748b;
  --danger: #dc2626;
  --info-bg: rgba(79,70,229,0.06);
  --info-border: rgba(79,70,229,0.18);
  --info-text: #4f46e5;
  --badge-bg: rgba(0,149,122,0.1);
  --badge-border: rgba(0,149,122,0.3);
  --hero-badge-bg: rgba(0,149,122,0.08);
  --hero-badge-border: rgba(0,149,122,0.3);
  --gradient-1: rgba(0,149,122,0.04);
  --gradient-2: rgba(79,70,229,0.04);
  --gradient-3: rgba(217,119,6,0.03);
  --btn-text: #ffffff;
  --row-hover: rgba(0,0,0,0.02);
  --td-border: rgba(226,232,240,0.8);
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  font-weight: 300;
  line-height: 1.8;
  overflow-x: hidden;
}

/* Default background gradient — most pages use green-top + purple-bottom */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 40% at 20% 10%, var(--gradient-1) 0%, transparent 60%),
    radial-gradient(ellipse 50% 30% at 80% 80%, var(--gradient-2) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.wrapper { position: relative; z-index: 1; }

/* ── TOPBAR ── */
.topbar {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 10px 24px;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 24px;
}

.topbar a {
  font-size: 0.8rem;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}

.topbar a:hover { color: var(--text); }

/* ── THEME TOGGLE ── */
.theme-toggle {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 5px 12px;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--muted);
  transition: all 0.2s;
  font-family: 'DM Sans', sans-serif;
  line-height: 1;
}

.theme-toggle:hover { color: var(--text); border-color: var(--accent); }

/* ── NAV (breadcrumb / logo bar on subpages) ── */
nav {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-logo {
  font-family: 'Playfair Display', serif;
  font-weight: 900;
  font-size: 1.2rem;
  background: linear-gradient(135deg, var(--accent), var(--accent3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
}

.nav-sep { color: var(--border); }
.nav-current { color: var(--muted); font-size: 0.85rem; }

/* ── FOOTER ── */
footer {
  border-top: 1px solid var(--border);
  padding: 24px;
  text-align: center;
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

footer a { font-size: 0.82rem; color: var(--muted); text-decoration: none; }
footer span { font-size: 0.82rem; color: var(--muted); }

/* ── HERO BADGE ── */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--hero-badge-bg);
  border: 1px solid var(--hero-badge-border);
  border-radius: 100px;
  padding: 6px 16px;
  font-size: 0.75rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 24px;
}

/* ── ARTICLE STRUCTURE ── */
article {
  max-width: 720px;
  margin: 0 auto;
  padding: 60px 24px 100px;
}

.article-meta {
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 20px;
}

.article-intro {
  font-size: 1.1rem;
  color: var(--text-soft);
  margin-bottom: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--border);
  line-height: 1.7;
}

/* ── TYPOGRAPHY (article pages) ── */
h1 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 20px;
}

h2 {
  font-family: 'Playfair Display', serif;
  font-size: 1.5rem;
  font-weight: 700;
  margin: 48px 0 16px;
}

p { margin-bottom: 20px; color: var(--text-soft); }
strong { color: var(--text); font-weight: 600; }

/* ── HIGHLIGHT BOX ── */
.highlight-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 0 12px 12px 0;
  padding: 24px 28px;
  margin: 32px 0;
}

.highlight-box p { margin: 0; }
.highlight-box p + p { margin-top: 12px; }

/* ── EXAMPLE TABLE ── */
.example-table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 0.9rem;
}

.example-table th {
  text-align: left;
  padding: 12px 16px;
  background: var(--surface2);
  color: var(--muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 500;
  border-bottom: 1px solid var(--border);
}

.example-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--td-border);
  color: var(--text);
}

.example-table tr:last-child td { border-bottom: none; }
.example-table .accent { color: var(--accent); font-weight: 600; }
.example-table .warn { color: var(--danger); font-weight: 600; }
.example-table .danger { color: var(--danger); font-weight: 600; }

/* ── FAQ ── */
.faq-item { border-bottom: 1px solid var(--border); padding: 24px 0; }
.faq-item:last-child { border-bottom: none; }
.faq-q { font-weight: 600; color: var(--text); margin-bottom: 12px; }
.faq-a { color: var(--text-soft); margin: 0; }
.faq-a a { color: var(--accent); text-decoration: none; }

/* ── AD BLOCK ── */
.ad-block {
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin: 40px 0;
}

/* ── RELATED ARTICLES ── */
.related { margin-top: 60px; padding-top: 40px; border-top: 1px solid var(--border); }
.related-title { font-family: 'Playfair Display', serif; font-size: 1.2rem; margin-bottom: 20px; }
.related-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }

.related-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.2s;
  display: block;
}

.related-card:hover { border-color: var(--accent); }
.related-card-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 8px; display: block; }
.related-card-title { font-size: 0.9rem; font-weight: 500; }

/* ── CTA BTN (base) ── */
.cta-btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 100px;
  font-weight: 700;
  font-family: 'DM Sans', sans-serif;
  text-decoration: none;
  font-size: 0.95rem;
  transition: opacity 0.2s;
}

.cta-btn:hover { opacity: 0.85; }