/* ============================================================
   KÄRCHER TAPICERÍA — Global Stylesheet
   Claude Agency OS v1 · Phase 08 Senior Web Developer
   Design tokens from Phase 07 UX Specialist
   ============================================================ */

/* ---- DESIGN TOKENS ---------------------------------------- */
:root {
  /* Colors */
  --color-bg:       #0a0e14;
  --color-surface:  #131820;
  --color-surface2: #1a2030;
  --color-accent:   #f5c842;
  --color-accent2:  #e8a020;
  --color-text:     #e4e8f0;
  --color-muted:    #6a7a8a;
  --color-border:   #1e2840;
  --color-green:    #2d9e52;
  --color-green-bg: #0a1a0f;
  --color-red:      #e05555;

  /* Typography */
  --font-sans:  'Inter', system-ui, -apple-system, sans-serif;
  --font-serif: Georgia, 'Times New Roman', serif;
  --font-mono:  'JetBrains Mono', 'Courier New', monospace;

  /* Spacing scale */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-6: 1.5rem;
  --sp-8: 2rem;
  --sp-12: 3rem;
  --sp-16: 4rem;

  /* Sizing */
  --max-content: 780px;
  --max-wide:    1140px;
  --radius:      8px;
  --radius-sm:   4px;

  /* Shadows */
  --shadow-card: 0 2px 12px rgba(0,0,0,0.4);
  --shadow-cta:  0 4px 20px rgba(245,200,66,0.18);
}

/* ---- RESET ------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
ul, ol { padding-left: 1.25rem; }
li { margin-bottom: var(--sp-2); }

/* ---- TYPOGRAPHY ------------------------------------------- */
h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.25;
  color: #fff;
}
h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); margin-bottom: var(--sp-4); }
h2 { font-size: clamp(1.2rem, 3vw, 1.6rem); margin: var(--sp-8) 0 var(--sp-4); color: var(--color-text); }
h3 { font-size: 1.05rem; margin: var(--sp-6) 0 var(--sp-3); color: var(--color-accent); }
p  { margin-bottom: var(--sp-4); color: var(--color-text); }
strong { color: #fff; }
em { color: var(--color-muted); font-style: italic; }

/* Article body uses serif for readability */
.article-body p,
.article-body li,
.article-body ol li {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.8;
}

/* ---- LAYOUT ----------------------------------------------- */
.container {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 0 var(--sp-4);
}
.container--wide {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 0 var(--sp-4);
}
.layout-sidebar {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: var(--sp-8);
  align-items: start;
}
@media (max-width: 860px) {
  .layout-sidebar { grid-template-columns: 1fr; }
  .sidebar { display: none; }
}

/* ---- NAVIGATION ------------------------------------------- */
.nav {
  background: rgba(10,14,20,0.96);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.nav__inner {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 0 var(--sp-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.nav__logo {
  font-size: 1rem;
  font-weight: 800;
  color: var(--color-accent);
  letter-spacing: -0.02em;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}
.nav__logo span { color: var(--color-text); font-weight: 400; font-size: 0.85rem; }
.nav__links {
  display: flex;
  gap: var(--sp-6);
  list-style: none;
  padding: 0;
  margin: 0;
}
.nav__links a {
  font-size: 0.875rem;
  color: var(--color-muted);
  text-decoration: none;
  transition: color 0.15s;
}
.nav__links a:hover { color: var(--color-text); }
.nav__links a.active { color: var(--color-accent); }
.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--sp-2);
  color: var(--color-text);
}
@media (max-width: 640px) {
  .nav__links { display: none; }
  .nav__links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 56px; left: 0; right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--sp-4);
    gap: var(--sp-4);
  }
  .nav__toggle { display: block; }
}

/* ---- BREADCRUMBS ------------------------------------------ */
.breadcrumb {
  padding: var(--sp-3) 0;
  font-size: 0.8rem;
  color: var(--color-muted);
}
.breadcrumb a { color: var(--color-muted); }
.breadcrumb a:hover { color: var(--color-accent); }
.breadcrumb span { margin: 0 var(--sp-2); }

/* ---- HERO — HOME ------------------------------------------ */
.hero {
  position: relative;
  background: #060a10;
  overflow: hidden;
  min-height: 520px;
  display: flex;
  align-items: center;
}
.hero__video {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  opacity: 0.35;
}
.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(6,10,16,0.85) 40%, rgba(10,20,30,0.6));
}
.hero__content {
  position: relative;
  z-index: 2;
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: var(--sp-16) var(--sp-4);
}
.hero__eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: var(--sp-3);
}
.hero__title {
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  color: #fff;
  margin-bottom: var(--sp-4);
  max-width: 680px;
}
.hero__sub {
  font-size: 1.05rem;
  color: rgba(228,232,240,0.8);
  max-width: 560px;
  margin-bottom: var(--sp-6);
  font-family: var(--font-serif);
  line-height: 1.7;
}
.hero__ctas {
  display: flex;
  gap: var(--sp-3);
  flex-wrap: wrap;
}

/* ---- HERO — ARTICLE --------------------------------------- */
.hero-article {
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg) 100%);
  padding: var(--sp-12) 0 var(--sp-8);
  border-bottom: 1px solid var(--color-border);
}
.hero-article__eyebrow {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: var(--sp-3);
}
.hero-article__title {
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  margin-bottom: var(--sp-4);
}
.hero-article__meta {
  font-size: 0.8rem;
  color: var(--color-muted);
  display: flex;
  gap: var(--sp-4);
  flex-wrap: wrap;
  align-items: center;
}
.hero-article__meta .tag {
  background: var(--color-surface2);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 2px 10px;
  font-size: 0.72rem;
}

/* ---- BUTTONS --------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  text-decoration: none;
}
.btn--primary {
  background: var(--color-accent);
  color: #0a0a0a;
  box-shadow: var(--shadow-cta);
}
.btn--primary:hover {
  background: var(--color-accent2);
  color: #0a0a0a;
  transform: translateY(-1px);
  text-decoration: none;
}
.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn--ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}
.btn--amazon {
  background: var(--color-green);
  color: #fff;
  font-size: 0.95rem;
  padding: 0.8rem 1.6rem;
  box-shadow: 0 4px 16px rgba(45,158,82,0.3);
}
.btn--amazon:hover {
  background: #25844a;
  color: #fff;
  transform: translateY(-1px);
  text-decoration: none;
}
.btn--sm {
  padding: 0.45rem 0.9rem;
  font-size: 0.8rem;
}

/* ---- CTA BOX --------------------------------------------- */
.cta-box {
  background: var(--color-green-bg);
  border: 1px solid rgba(45,158,82,0.35);
  border-radius: var(--radius);
  padding: var(--sp-6);
  margin: var(--sp-6) 0;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}
.cta-box__title {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
}
.cta-box__price {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-accent);
  display: flex;
  align-items: baseline;
  gap: var(--sp-2);
}
.cta-box__price span {
  font-size: 0.8rem;
  color: var(--color-muted);
  font-weight: 400;
}
.cta-box__note {
  font-size: 0.78rem;
  color: var(--color-muted);
  font-family: var(--font-serif);
}
.cta-box__footer {
  font-size: 0.72rem;
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
  padding-top: var(--sp-3);
  margin-top: var(--sp-2);
}

/* ---- SPEC TABLE ------------------------------------------- */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin: var(--sp-6) 0;
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
}
.spec-table th {
  background: var(--color-surface2);
  color: var(--color-accent);
  padding: var(--sp-3) var(--sp-4);
  text-align: left;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-bottom: 2px solid var(--color-accent);
}
.spec-table td {
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}
.spec-table tr:last-child td { border-bottom: none; }
.spec-table tr:hover td { background: var(--color-surface2); }
.spec-table .highlight { color: var(--color-accent); font-weight: 700; }
.spec-table .ok  { color: var(--color-green); }
.spec-table .warn { color: #e8a020; }
.spec-table .bad { color: var(--color-red); }

/* ---- FAQ ACCORDION --------------------------------------- */
.faq { margin: var(--sp-8) 0; }
.faq__item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: var(--sp-2);
  background: var(--color-surface);
  overflow: hidden;
}
.faq__question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--sp-4) var(--sp-6);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text);
  user-select: none;
  transition: color 0.15s;
  gap: var(--sp-4);
}
.faq__question:hover { color: var(--color-accent); }
.faq__icon {
  flex-shrink: 0;
  width: 22px; height: 22px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.7rem;
  color: var(--color-muted);
  transition: all 0.2s;
}
.faq__item.open .faq__icon {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: rotate(45deg);
}
.faq__answer {
  display: none;
  padding: 0 var(--sp-6) var(--sp-4);
  font-size: 0.95rem;
  color: var(--color-muted);
  line-height: 1.7;
  font-family: var(--font-serif);
}
.faq__item.open .faq__answer { display: block; }

/* ---- CARDS ----------------------------------------------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--sp-6);
  box-shadow: var(--shadow-card);
}
.card--accent { border-color: rgba(245,200,66,0.3); }
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--sp-4);
  margin: var(--sp-6) 0;
}
.profile-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--sp-4);
  cursor: pointer;
  transition: border-color 0.15s, transform 0.15s;
  text-decoration: none;
  display: block;
}
.profile-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  text-decoration: none;
}
.profile-card__icon { font-size: 1.8rem; margin-bottom: var(--sp-2); }
.profile-card__title { font-size: 0.95rem; font-weight: 700; color: #fff; margin-bottom: var(--sp-1); }
.profile-card__desc { font-size: 0.82rem; color: var(--color-muted); line-height: 1.5; }

/* ---- ARTICLE CONTENT ------------------------------------- */
.article-section { padding: var(--sp-12) 0; }
.article-section + .article-section {
  border-top: 1px solid var(--color-border);
  padding-top: var(--sp-10);
}

/* Steps / HowTo */
.steps { list-style: none; padding: 0; counter-reset: step; }
.steps li {
  counter-increment: step;
  display: flex;
  gap: var(--sp-4);
  margin-bottom: var(--sp-6);
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--color-text);
  line-height: 1.7;
}
.steps li::before {
  content: counter(step);
  flex-shrink: 0;
  width: 28px; height: 28px;
  background: var(--color-accent);
  color: #0a0a0a;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 0.8rem;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin-top: 2px;
}

/* Callout/Note box */
.callout {
  background: var(--color-surface2);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: var(--sp-4) var(--sp-6);
  margin: var(--sp-6) 0;
  font-size: 0.9rem;
  color: var(--color-muted);
  font-style: italic;
}
.callout strong { color: var(--color-accent); font-style: normal; }

/* ---- SIDEBAR --------------------------------------------- */
.sidebar { position: sticky; top: 72px; }
.toc {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--sp-4);
  margin-bottom: var(--sp-4);
}
.toc__title {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-muted);
  margin-bottom: var(--sp-3);
}
.toc__list { list-style: none; padding: 0; }
.toc__list li { margin-bottom: var(--sp-2); }
.toc__list a {
  font-size: 0.82rem;
  color: var(--color-muted);
  text-decoration: none;
  transition: color 0.15s;
  display: block;
  padding: var(--sp-1) 0;
  border-bottom: 1px solid transparent;
}
.toc__list a:hover, .toc__list a.active {
  color: var(--color-accent);
}

/* ---- RELATED LINKS --------------------------------------- */
.related {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--sp-4);
}
.related__title {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-muted);
  margin-bottom: var(--sp-3);
}
.related__list { list-style: none; padding: 0; }
.related__list li { margin-bottom: 0; }
.related__list a {
  font-size: 0.82rem;
  color: var(--color-muted);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) 0;
  border-bottom: 1px solid var(--color-border);
  transition: color 0.15s;
}
.related__list li:last-child a { border-bottom: none; }
.related__list a:hover { color: var(--color-accent); text-decoration: none; }
.related__list a::before { content: '→'; color: var(--color-accent); font-size: 0.8rem; }

/* ---- STICKY FOOTER CTA (article pages — mobile dark bar) - */
.sticky-cta {
  display: none;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: rgba(10,14,20,0.97);
  border-top: 1px solid var(--color-border);
  padding: var(--sp-3) var(--sp-4);
  z-index: 200;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.sticky-cta__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  max-width: var(--max-wide);
  margin: 0 auto;
}
.sticky-cta__text {
  font-size: 0.82rem;
  color: var(--color-muted);
  line-height: 1.3;
}
.sticky-cta__text strong { display: block; color: var(--color-text); font-size: 0.88rem; }
@media (max-width: 640px) { .sticky-cta { display: flex; } }
body.has-sticky-cta { padding-bottom: 72px; }

/* ---- MOBILE IMPROVEMENTS --------------------------------- */
@media (max-width: 640px) {
  /* Product cards stack full width */
  .product-showcase { grid-template-columns: 1fr; }

  /* VS hero duel on comparativa */
  .vs-duel { grid-template-columns: 1fr; }

  /* Stats row 2 columns on mobile */
  .stats-row { grid-template-columns: 1fr 1fr; }

  /* How-works 1 column on small mobile */
  .how-works { grid-template-columns: 1fr; }

  /* Uses grid 1 column */
  .uses-grid { grid-template-columns: 1fr; }

  /* Mid CTA banner stack */
  .mid-cta-banner { flex-direction: column; text-align: center; }
  .mid-cta-banner__btn { width: 100%; text-align: center; }

  /* VS banner stack */
  .vs-banner { flex-direction: column; }

  /* Article hero mobile product duel */
  .hero-duel { grid-template-columns: 1fr; gap: 0.75rem; }
  .hero-duel .vs-label { display: none; }

  /* Home hero padding */
  .hero__content { padding: 3rem 1rem; }

  /* Trust bar: 2 items per row */
  .trust-bar__inner { gap: 0.75rem; }
  .trust-bar__item { font-size: 0.72rem; }
}

/* Inline CTA post-tabla mobile: stack buttons */
@media (max-width: 480px) {
  [style*="grid-template-columns:1fr 1fr"] {
    display: flex !important;
    flex-direction: column !important;
  }
}

/* ---- AFFILIATE DISCLOSURE -------------------------------- */
.disclosure {
  font-size: 0.78rem;
  color: var(--color-muted);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--sp-3) var(--sp-4);
  margin: var(--sp-6) 0;
}

/* ---- FOOTER ---------------------------------------------- */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--sp-12) 0 var(--sp-8);
  margin-top: var(--sp-16);
}
.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--sp-8);
  margin-bottom: var(--sp-8);
}
.footer__brand h3 {
  font-size: 1rem;
  color: var(--color-accent);
  margin: 0 0 var(--sp-3);
}
.footer__brand p {
  font-size: 0.82rem;
  color: var(--color-muted);
  line-height: 1.6;
}
.footer__col h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  margin-bottom: var(--sp-3);
}
.footer__col ul { list-style: none; padding: 0; }
.footer__col ul li { margin-bottom: var(--sp-2); }
.footer__col ul a { font-size: 0.82rem; color: var(--color-muted); text-decoration: none; }
.footer__col ul a:hover { color: var(--color-accent); }
.footer__bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--sp-4);
  font-size: 0.75rem;
  color: var(--color-muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-2);
}
@media (max-width: 640px) {
  .footer__grid { grid-template-columns: 1fr; }
  .footer__bottom { flex-direction: column; }
}

/* ---- UTILS ----------------------------------------------- */
.text-accent  { color: var(--color-accent); }
.text-muted   { color: var(--color-muted); }
.text-green   { color: var(--color-green); }
.text-center  { text-align: center; }
.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--sp-2); }
.mb-4 { margin-bottom: var(--sp-4); }
.mb-6 { margin-bottom: var(--sp-6); }
.mb-8 { margin-bottom: var(--sp-8); }
.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--sp-4); }
.mt-8 { margin-top: var(--sp-8); }
.hidden { display: none; }

/* ---- VIDEO PLACEHOLDER ----------------------------------- */
.video-placeholder {
  background: #060a10;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  aspect-ratio: 16/9;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-3);
  color: var(--color-muted);
  font-size: 0.9rem;
  margin: var(--sp-6) 0;
}
.video-placeholder__icon { font-size: 2rem; }