/* =========================================================
   IntercambIA — buscador de equivalencias de piezas automotrices
   Archetype: Glassmorphism Modern (paleta industrial/tech)
   ========================================================= */

:root {
  --bg:        #eef1f5;
  --ink:       #101826;
  --ink-soft:  #4b5768;
  --accent:    #ff6a3d;   /* naranja refacción */
  --accent-2:  #2b6cff;   /* azul acero */
  --glass:     rgba(255, 255, 255, 0.55);
  --glass-2:   rgba(255, 255, 255, 0.32);
  --line:      rgba(16, 24, 38, 0.10);
  --radius:    20px;
  --radius-sm: 12px;
  --font-display: "Plus Jakarta Sans", Inter, system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.1;
  margin: 0;
  color: var(--ink);
}

p { margin: 0; }
em { font-style: italic; color: var(--accent); }

a { color: inherit; text-decoration: none; }

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-2);
  margin-bottom: 0.75rem;
}

/* ---------- animated mesh background ---------- */
.mesh-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(at 15% 20%, rgba(255, 106, 61, 0.28) 0%, transparent 45%),
    radial-gradient(at 85% 15%, rgba(43, 108, 255, 0.25) 0%, transparent 45%),
    radial-gradient(at 50% 90%, rgba(43, 108, 255, 0.16) 0%, transparent 55%);
  filter: blur(60px) saturate(140%);
  animation: meshDrift 32s ease-in-out infinite;
}
@keyframes meshDrift {
  0%, 100% { transform: scale(1) rotate(0deg); }
  50%      { transform: scale(1.15) rotate(8deg); }
}
@media (prefers-reduced-motion: reduce) {
  .mesh-bg { animation: none; }
}

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem clamp(1.25rem, 5vw, 3rem);
  background: rgba(238, 241, 245, 0.72);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid var(--line);
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
}
.nav-logo { font-size: 1.3rem; }
.nav-links {
  display: flex;
  gap: clamp(1rem, 3vw, 2rem);
  font-size: 0.92rem;
  font-weight: 600;
}
.nav-links a { position: relative; padding-bottom: 2px; }
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 2px;
  background: var(--accent);
  transition: right 0.25s ease;
}
.nav-links a:hover::after { right: 0; }

@media (max-width: 560px) {
  .nav { flex-wrap: wrap; gap: 0.6rem 1rem; padding: 0.85rem 1.1rem; }
  .nav-links { gap: 0.9rem; font-size: 0.82rem; flex-wrap: nowrap; white-space: nowrap; }
}

/* ---------- hero ---------- */
.hero {
  padding: clamp(3rem, 8vw, 6rem) clamp(1.25rem, 5vw, 3rem) clamp(2rem, 5vw, 3rem);
  display: flex;
  justify-content: center;
}
.hero-inner {
  max-width: 760px;
  width: 100%;
  text-align: center;
}
.hero h1 {
  font-size: clamp(2.1rem, 5.5vw, 3.4rem);
  margin-bottom: 1rem;
}
.hero-sub {
  max-width: 560px;
  margin: 0 auto 2.25rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

/* ---------- glass card ---------- */
.glass-card {
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius);
  box-shadow: 0 20px 60px rgba(16, 24, 38, 0.10);
}
@supports (backdrop-filter: blur(20px)) {
  .glass-card {
    background: var(--glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
  }
}

/* ---------- search form ---------- */
.search-card {
  padding: clamp(1.25rem, 4vw, 2rem);
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.search-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
@media (max-width: 640px) {
  .search-row { grid-template-columns: 1fr; }
}
.field { display: flex; flex-direction: column; gap: 0.4rem; }
.field-label { font-size: 0.82rem; font-weight: 600; color: var(--ink-soft); }
.field input {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.8);
  font-family: var(--font-body);
  font-size: 0.98rem;
  color: var(--ink);
}
.field input:focus {
  outline: 2px solid var(--accent-2);
  outline-offset: 1px;
}

.btn-glass, .btn-search {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.9rem 1.5rem;
  border-radius: 999px;
  border: none;
  background: linear-gradient(135deg, var(--accent), #ff8a5c);
  color: #fff;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.98rem;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 10px 24px rgba(255, 106, 61, 0.35);
}
.btn-glass:hover, .btn-search:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(255, 106, 61, 0.42);
}
.btn-search { align-self: flex-start; }

/* ---------- populares ---------- */
.popular-row {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}
.popular-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-soft);
  margin-right: 0.15rem;
}
.chip-pop {
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.6);
  color: var(--ink);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}
.chip-pop:hover { background: rgba(255, 255, 255, 0.95); transform: translateY(-1px); }

.search-status {
  margin-top: 1.25rem;
  font-size: 0.95rem;
  color: var(--ink-soft);
  min-height: 1.4em;
}
.search-status.is-error { color: #b3261e; }
.search-status.is-ok { color: #1f7a45; }

.search-results {
  margin-top: 1rem;
  display: grid;
  gap: 0.75rem;
  text-align: left;
}
.result-card {
  position: relative;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid var(--line);
}
.result-card h4 { font-family: var(--font-display); font-size: 1rem; margin-bottom: 0.3rem; }
.result-card p { font-size: 0.9rem; color: var(--ink-soft); }
.result-card-id { border-color: var(--accent-2); background: rgba(43, 108, 255, 0.06); }
.result-card-compact { padding: 0.75rem 0.9rem; }
.result-card-compact h4 { font-size: 0.85rem; margin-bottom: 0.15rem; }
.result-card-compact p { font-size: 0.82rem; }

.results-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 0.75rem;
}
@media (max-width: 780px) {
  .results-columns { grid-template-columns: 1fr; }
}
.results-panel {
  padding: 1rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.4);
  border: 1px solid var(--line);
}
.results-panel-title {
  margin: 0 0 0.75rem;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
}
.results-panel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 0.6rem;
}
.product-image { margin-top: 1rem; }
.product-image-card {
  padding: 1rem;
  text-align: center;
}
.product-image-warning {
  display: block;
  margin-bottom: 0.6rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: #8a5a00;
  background: rgba(255, 191, 0, 0.18);
  border: 1px solid rgba(255, 191, 0, 0.4);
  border-radius: 999px;
  padding: 0.3rem 0.8rem;
  display: inline-block;
}
.product-image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  justify-items: center;
}
.product-image-item img {
  display: block;
  max-width: 220px;
  max-height: 220px;
  width: 100%;
  height: auto;
  object-fit: contain;
  margin: 0 auto 0.5rem;
  border-radius: var(--radius-sm);
  background: #fff;
}
.product-image-credit {
  font-size: 0.72rem;
  color: var(--ink-soft);
  opacity: 0.8;
}
.product-image-credit a { text-decoration: underline; }

.badge-ia {
  display: inline-block;
  margin-bottom: 0.5rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: var(--accent-2);
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.btn-whatsapp {
  margin-top: 0.25rem;
  background: linear-gradient(135deg, #25D366, #1DA851);
  box-shadow: 0 10px 24px rgba(37, 211, 102, 0.35);
  align-self: flex-start;
  padding: 0.75rem 1.25rem;
  font-size: 0.9rem;
}
.btn-whatsapp:hover { box-shadow: 0 14px 30px rgba(37, 211, 102, 0.42); }

/* ---------- calificación de la búsqueda ---------- */
.search-feedback { margin-top: 0.75rem; }
.feedback-card {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  background: rgba(16, 24, 38, 0.04);
  font-size: 0.85rem;
  color: var(--ink-soft);
}
.feedback-btn {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  width: 2.2rem;
  height: 2.2rem;
  font-size: 1.1rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s ease;
}
.feedback-btn:hover:not(:disabled) { transform: scale(1.12); }
.feedback-btn:disabled { opacity: 0.5; cursor: default; }
.feedback-thanks { color: var(--ink); font-weight: 600; }

/* ---------- ejemplos ---------- */
.section-sub {
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.95rem;
  margin: -1.75rem auto 2rem;
  max-width: 560px;
}
.examples {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}
.example-card { padding: 1.5rem; }
.example-head { margin-bottom: 1rem; }
.example-tag {
  display: inline-block;
  margin-bottom: 0.4rem;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.example-head h3 { font-size: 1.05rem; }
.example-results { display: grid; gap: 0.6rem; }
.example-results .result-card { background: rgba(255, 255, 255, 0.55); }

/* ---------- ad slots ---------- */
.ad-slot {
  max-width: 980px;
  margin: 2.5rem auto;
  padding: 1.75rem 1rem;
  border: 1px dashed var(--line);
  border-radius: var(--radius-sm);
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.8rem;
  background: rgba(255, 255, 255, 0.35);
}
.ad-label {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  font-size: 0.68rem;
  color: var(--ink-soft);
  opacity: 0.7;
}

/* ---------- sections ---------- */
.section {
  padding: clamp(2.5rem, 6vw, 4.5rem) clamp(1.25rem, 5vw, 3rem);
  max-width: 1080px;
  margin: 0 auto;
}
.section-alt { max-width: 100%; background: rgba(255, 255, 255, 0.35); }
.section-alt > * { max-width: 1080px; margin-left: auto; margin-right: auto; }
.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.1rem);
  text-align: center;
  margin-bottom: 2.5rem;
}

/* ---------- steps ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
@media (max-width: 780px) { .steps { grid-template-columns: 1fr; } }
.step-card {
  padding: 1.75rem;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--line);
}
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background: var(--accent-2);
  color: #fff;
  font-weight: 800;
  font-family: var(--font-display);
  margin-bottom: 0.9rem;
}
.step-card h3 { font-size: 1.05rem; margin-bottom: 0.4rem; }
.step-card p { color: var(--ink-soft); font-size: 0.92rem; }

/* ---------- features ---------- */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
@media (max-width: 780px) { .features { grid-template-columns: 1fr; } }
.feature-card {
  padding: 1.75rem;
  border-radius: var(--radius);
  text-align: center;
}
.feature-card h3 { font-size: 1.05rem; margin-bottom: 0.5rem; }
.feature-card p { color: var(--ink-soft); font-size: 0.92rem; }

/* ---------- faq ---------- */
.faq-list {
  display: grid;
  gap: 0.75rem;
  max-width: 760px;
  margin: 0 auto;
}
.faq-item {
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--line);
  overflow: hidden;
}
.faq-q {
  width: 100%;
  text-align: left;
  padding: 1.1rem 1.4rem;
  background: none;
  border: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--ink);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.faq-q .chev { transition: transform 0.2s ease; flex-shrink: 0; }
.faq-item.is-open .faq-q .chev { transform: rotate(180deg); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
  padding: 0 1.4rem;
  color: var(--ink-soft);
  font-size: 0.92rem;
}
.faq-item.is-open .faq-a {
  max-height: 240px;
  padding-bottom: 1.1rem;
}

/* ---------- footer ---------- */
.footer {
  padding: 2.5rem clamp(1.25rem, 5vw, 3rem) 3rem;
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.85rem;
}
.footer-note { margin-top: 0.4rem; font-size: 0.78rem; opacity: 0.8; }

/* ---------- reveal ---------- */
[data-reveal] { opacity: 0; transform: translateY(16px); transition: opacity 0.5s ease, transform 0.5s ease; }
[data-reveal].is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
}