/* ==================================================
   CarmIA - Hoja de estilos principal (mobile-first)
   ================================================== */

:root {
  --color-primary: #6d28d9;
  --color-primary-dark: #5b21b6;
  --color-accent: #f59e0b;
  --color-bg: #ffffff;
  --color-bg-alt: #f6f5fb;
  --color-text: #1e1b2e;
  --color-text-soft: #5b5670;
  --color-border: #e6e2f2;
  --color-success: #15803d;
  --color-error: #b91c1c;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-card: 0 6px 24px -12px rgba(30, 27, 46, 0.18);
  --shadow-card-hover: 0 16px 40px -16px rgba(109, 40, 217, 0.35);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: none; }

img { max-width: 100%; height: auto; }

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.25rem;
}
.container-narrow { max-width: 760px; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: 0 0 8px 0;
  z-index: 100;
}
.skip-link:focus { left: 0; }

/* ---------- Cabecera ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 64px;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--color-text);
  font-weight: 800;
}
.logo-img {
  display: block;
  width: auto;
  height: auto;
  max-height: 42px;
  max-width: 100%;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-list a {
  display: block;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--color-text-soft);
  font-weight: 600;
}
.nav-list a:hover, .nav-list a.active { color: var(--color-primary); background: var(--color-bg-alt); }

/* Menú hamburguesa (móvil) */
.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Botones ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.3rem;
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  text-align: center;
}
.btn:active { transform: scale(0.98); }
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  box-shadow: 0 6px 18px -8px rgba(109, 40, 217, 0.55);
}
.btn-primary:hover { background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary)); }
.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border: 2px solid var(--color-border);
}
.btn-ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn-white { background: #fff; color: var(--color-primary); }
.btn-white:hover { background: var(--color-bg-alt); }
.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn-outline:hover { background: var(--color-primary); color: #fff; }
.btn-danger {
  background: #b91c1c;
  color: #fff;
  box-shadow: 0 6px 18px -8px rgba(185, 28, 28, 0.55);
}
.btn-danger:hover { background: #991b1b; }
.btn-sm { padding: 0.5rem 0.9rem; font-size: 0.9rem; }
.btn-lg { padding: 0.9rem 1.7rem; font-size: 1.1rem; }
.btn-block { width: 100%; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

/* El botón de la cabecera (.nav-cta) es un .btn dentro de .nav-list. Las reglas
   genéricas del nav (.nav-list a, especificidad 0,1,1) ganan a .btn-primary
   (0,1,0) y dejaban el texto en gris sobre el morado (1,02:1). Aquí se
   restituye el color propio del botón, también en estado hover. */
.nav-list .nav-cta .btn,
.nav-list .nav-cta .btn:hover,
.nav-list .nav-cta .btn.active {
  color: #fff;
}
.nav-list .nav-cta .btn:hover,
.nav-list .nav-cta .btn.active {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
}

/* ---------- Hero ---------- */
.hero {
  background:
    radial-gradient(1100px 420px at 80% -10%, rgba(245, 158, 11, 0.18), transparent),
    radial-gradient(900px 500px at 10% -20%, rgba(109, 40, 217, 0.22), transparent),
    linear-gradient(180deg, #ffffff, var(--color-bg-alt));
  padding: 3.5rem 0 2.5rem;
}
.hero-inner { text-align: center; }
.hero h1 {
  font-size: clamp(1.9rem, 5vw, 3.2rem);
  line-height: 1.15;
  margin: 0 0 0.9rem;
}
.hero-sub {
  font-size: clamp(1.05rem, 2.5vw, 1.35rem);
  color: var(--color-text-soft);
  max-width: 640px;
  margin: 0 auto 1.6rem;
}
.hero-cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.8rem; }
.hero-features {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.9rem;
  padding: 0;
  margin: 2.2rem 0 0;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text-soft);
}
.hero-features li::before { content: "✓"; color: var(--color-primary); font-weight: 800; margin-right: 0.35rem; }

/* ---------- Secciones ---------- */
.section { padding: 3rem 0; }
.section-alt { background: var(--color-bg-alt); }
.section-gradient {
  background: linear-gradient(120deg, var(--color-primary), #7c3aed);
  color: #fff;
}
.section h2 {
  font-size: clamp(1.5rem, 3.5vw, 2.1rem);
  margin: 0 0 0.5rem;
}
.section-sub { color: var(--color-text-soft); margin: 0 0 2rem; font-size: 1.05rem; }
.section-gradient .section-sub { color: rgba(255, 255, 255, 0.85); }

.page-header {
  background: linear-gradient(180deg, var(--color-bg-alt), #ffffff);
  padding: 3rem 0 1.5rem;
  text-align: center;
}
.page-header h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin: 0 0 0.6rem; }
.page-sub { color: var(--color-text-soft); margin: 0; max-width: 680px; margin-inline: auto; }

/* ---------- Tarjetas de herramientas ---------- */
.tools-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.2rem;
}
.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card-hover); }
.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary), #a855f7);
}
.card-icon .icon { width: 26px; height: 26px; }
.card-icon-sm { width: 44px; height: 44px; border-radius: 12px; }
.card-icon-sm .icon { width: 22px; height: 22px; }
.card-title { margin: 0; font-size: 1.15rem; }
.card-desc { margin: 0; color: var(--color-text-soft); flex: 1; }

/* ---------- Features ---------- */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.feature {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.3rem 1.4rem;
}
.feature h3 { margin: 0 0 0.4rem; font-size: 1.05rem; }
.feature p { margin: 0; color: var(--color-text-soft); }

/* ---------- Populares ---------- */
.popular-list { display: grid; grid-template-columns: 1fr; gap: 0.9rem; }
.popular {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.popular:hover { transform: translateY(-3px); box-shadow: var(--shadow-card-hover); }
.popular-text { display: flex; flex-direction: column; flex: 1; min-width: 0; }
.popular-text strong { color: var(--color-text); }
.popular-text small { color: var(--color-text-soft); }
.popular-arrow { color: var(--color-primary); font-size: 1.3rem; font-weight: 800; }

/* ---------- Split ---------- */
.split { display: grid; grid-template-columns: 1fr; gap: 2rem; }
.split h2 { margin-top: 0; }
.split p { color: rgba(255, 255, 255, 0.92); margin-bottom: 1.4rem; }
.split a.btn { margin-top: 0.2rem; }

/* ---------- FAQ ---------- */
.faq { display: grid; gap: 0.8rem; }
.faq-item {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.2rem 0.4rem;
}
.faq-item summary {
  cursor: pointer;
  font-weight: 700;
  padding: 0.9rem 1rem;
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; float: right; font-size: 1.3rem; color: var(--color-primary); }
.faq-item[open] summary::after { content: "−"; }
.faq-item p { margin: 0; padding: 0 1rem 1rem; color: var(--color-text-soft); }

/* ---------- Formularios ---------- */
.card-form { gap: 1rem; display: flex; flex-direction: column; }
.form-group { display: flex; flex-direction: column; gap: 0.4rem; }
.form-group label { font-weight: 700; font-size: 0.95rem; }
.form-group input,
.form-group select,
.form-group textarea {
  font-family: inherit;
  font-size: 1rem;
  padding: 0.75rem 0.9rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--color-text);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(109, 40, 217, 0.15);
}
.form-status { min-height: 1.5em; font-weight: 600; }
.form-status-ok { color: var(--color-success); }
.form-status-error { color: var(--color-error); }
.form-hint { font-size: 0.85rem; color: var(--color-text-soft); }

/* ---------- Acceso / registro ---------- */
.auth-tabs { display: flex; gap: 0.5rem; margin-bottom: 1.2rem; }
.auth-tab {
  flex: 1;
  padding: 0.8rem 1rem;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text-soft);
  cursor: pointer;
  transition: all 0.15s ease;
}
.auth-tab:hover { border-color: var(--color-primary); }
.auth-tab.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

/* ---------- Mi cuenta ---------- */
.account-list { display: grid; gap: 0.9rem; margin: 0 0 1.5rem; }
.account-list div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
}
.account-list dt { font-weight: 700; color: var(--color-text-soft); }
.account-list dd { margin: 0; font-weight: 700; overflow-wrap: anywhere; }

/* ---------- Administración ---------- */
.admin-nav { background: var(--color-surface); border-bottom: 1px solid var(--color-border); }
.admin-nav .container { display: flex; flex-wrap: wrap; gap: 0.5rem; padding-top: 0.75rem; padding-bottom: 0.75rem; }
.admin-nav a {
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--color-text-soft);
  text-decoration: none;
  border: 2px solid transparent;
  transition: all 0.15s ease;
}
.admin-nav a:hover { color: var(--color-primary); }
.admin-nav a.active { color: var(--color-primary); border-color: var(--color-primary); }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 1rem; margin-bottom: 2rem; }
.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.stat-card strong { font-size: 2rem; color: var(--color-primary); }
.stat-card span { color: var(--color-text-soft); font-weight: 600; }
.h2-block { margin: 0 0 1rem; font-size: 1.25rem; }
.table { width: 100%; border-collapse: collapse; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-sm); overflow: hidden; }
.table th, .table td { text-align: left; padding: 0.75rem 1rem; border-bottom: 1px solid var(--color-border); vertical-align: top; }
.table th { background: rgba(0, 0, 0, 0.04); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--color-text-soft); }
.table tr:last-child td { border-bottom: none; }
.table .nowrap { white-space: nowrap; }
.table .message-cell { max-width: 340px; overflow-wrap: anywhere; }
.badge { display: inline-block; padding: 0.2rem 0.6rem; border-radius: 999px; font-size: 0.8rem; font-weight: 700; background: var(--color-border); color: var(--color-text-soft); }
.badge-premium { background: #fde9d7; color: #b45309; }
.consumo-alerts { list-style: none; display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0 0 2rem; padding: 0; }
.consumo-alert { padding: 0.5rem 0.9rem; border-radius: var(--radius-sm); background: #fee2e2; color: #b91c1c; font-weight: 700; font-size: 0.9rem; }
.ia-on { color: var(--color-success); }
.ia-off { color: var(--color-error); }
.badge-premium { background: var(--color-accent); color: #fff; }
.chart-bars { display: flex; align-items: flex-end; gap: 6px; height: 160px; padding-top: 1rem; border-bottom: 2px solid var(--color-border); }
.chart-col { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: flex-end; height: 100%; }
.chart-bar { width: 100%; max-width: 34px; background: linear-gradient(180deg, var(--color-primary), var(--color-accent)); border-radius: 6px 6px 0 0; min-height: 2px; }
.chart-label { font-size: 0.68rem; color: var(--color-text-soft); margin-top: 0.3rem; white-space: nowrap; }

/* ---------- Pasos ---------- */
.steps { display: grid; grid-template-columns: 1fr; gap: 1.4rem; margin-bottom: 2.5rem; }
.step { text-align: center; }
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  font-weight: 800;
  font-size: 1.2rem;
  margin-bottom: 0.7rem;
}
.step h2 { font-size: 1.2rem; }
.step p { color: var(--color-text-soft); margin: 0.4rem 0 0; }

.check-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.7rem; }
.check-list li { padding-left: 1.7rem; position: relative; }
.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 800;
}

.h-margin { margin-top: 2.5rem; }

/* ---------- Legales ---------- */
.legal h2 { font-size: 1.25rem; margin-top: 1.8rem; }

/* ---------- Footer ---------- */
.site-footer {
  background: #191526;
  color: #cfcadf;
  margin-top: 3rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding: 2.5rem 1.25rem;
}
.footer-brand .logo { color: #fff; margin-bottom: 0.6rem; }
/* El logo de CarmIA es oscuro: sobre el pie oscuro (#191526) se apoya en un
   soporte blanco para mantener el contraste sin retocar la imagen. */
.footer-brand .logo-chip {
  width: fit-content;
  padding: 0.45rem 0.7rem;
  background: #fff;
  border-radius: 10px;
}
.footer-brand .logo-img { max-height: 30px; }
.footer-brand p { margin: 0.5rem 0 0; max-width: 320px; }
.site-footer h4 { color: #fff; margin: 0 0 0.8rem; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.5rem; }
.site-footer a { color: #cfcadf; }
.site-footer a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1rem 1.25rem;
  font-size: 0.9rem;
}

/* ---------- Utilidades ---------- */
.hidden { display: none; }
.mt-0 { margin-top: 0; }

/* ---------- Resultado de herramientas ---------- */
.result {
  margin-top: 1.6rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.3rem;
}
.result-head { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 0.8rem; }
.result-head h2 { margin: 0; font-size: 1.2rem; }
.result-content { display: grid; gap: 0.9rem; }
.result-block {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1rem;
}
.result-label { margin: 0 0 0.4rem; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--color-primary); }
.result-text { white-space: pre-wrap; word-break: break-word; line-height: 1.7; }
.result-list { margin: 0; padding-left: 1.2rem; display: grid; gap: 0.35rem; }
.result-list li::marker { color: var(--color-primary); }
.result-actions { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 1rem; }
.result-actions .btn { padding: 0.6rem 1rem; font-size: 0.95rem; }
.req { color: var(--color-error); }

/* ---------- Responsive (tablet / escritorio) ---------- */
@media (min-width: 640px) {
  .tools-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .popular-list { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
  .split { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 960px) {
  .tools-grid { grid-template-columns: repeat(3, 1fr); }
  .features-grid { grid-template-columns: repeat(4, 1fr); }
  .nav-toggle { display: none; }
  .site-nav { display: block !important; }
}

/* Móvil: navegación desplegable */
@media (max-width: 959px) {
  .site-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
  }
  .site-nav.open { display: block; }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 0.6rem 1.25rem 1.1rem;
    gap: 0.15rem;
  }
  .nav-list a { padding: 0.8rem 0.75rem; font-size: 1.05rem; }
  .nav-list .nav-cta { margin-top: 0.5rem; }
  .nav-list .btn { width: 100%; }
}