/* =============================================
   DIPROME — Diseño de Proyectos Mecatrónicos
   Stylesheet v2.0 — Tema claro
   ============================================= */

:root {
  --rojo:      #8b0000;
  --rojo-vivo: #c0392b;
  --rojo-dim:  #d4a0a0;
  --blanco:    #ffffff;
  --gris-950:  #f7f7f7;
  --gris-900:  #f0f0f0;
  --gris-800:  #e8e8e8;
  --gris-700:  #d0d0d0;
  --gris-600:  #b0b0b0;
  --gris-500:  #888888;
  --gris-400:  #555555;
  --gris-300:  #333333;
  --gris-100:  #111111;
  --acento:    #8b0000;
  --fondo:     #f7f7f7;
  --fondo-2:   #efefef;
  --fondo-3:   #e4e4e4;
  --texto:     #1a1a1a;
  --texto-2:   #444444;
  --texto-3:   #777777;
  --font-head: 'Rajdhani', sans-serif;
  --font-body: 'Barlow', sans-serif;
  --font-mono: 'Share Tech Mono', monospace;
  --nav-h:     68px;
  --trans:     0.25s ease;
}

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

body {
  background: var(--fondo);
  color: var(--texto);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--gris-900); }
::-webkit-scrollbar-thumb { background: var(--rojo); border-radius: 3px; }

h1, h2, h3, h4 { font-family: var(--font-head); font-weight: 700; line-height: 1.15; }
a { color: var(--acento); text-decoration: none; transition: color var(--trans); }
a:hover { color: var(--rojo-vivo); }
.accent { color: var(--acento); }

/* ===== NAVBAR ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(247,247,247,0.96);
  backdrop-filter: blur(10px);
  border-bottom: 2px solid var(--rojo);
  z-index: 1000;
  box-shadow: 0 1px 12px rgba(0,0,0,0.08);
}
.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  padding: 0 2rem;
  gap: 2rem;
}
.nav-logo img { height: 44px; display: block; background: #fff; padding: 4px 8px; border-radius: 4px; }
.nav-tabs { display: flex; gap: 0.25rem; margin-left: auto; }
.tab-btn {
  background: none;
  border: none;
  color: var(--texto-2);
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.5rem 1rem;
  cursor: pointer;
  position: relative;
  transition: color var(--trans);
}
.tab-btn::after {
  content: '';
  position: absolute;
  bottom: 0; left: 50%; right: 50%;
  height: 2px;
  background: var(--acento);
  transition: left var(--trans), right var(--trans);
}
.tab-btn:hover { color: var(--texto); }
.tab-btn.active { color: var(--acento); }
.tab-btn.active::after { left: 1rem; right: 1rem; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  margin-left: auto;
  padding: 4px;
}
.hamburger span { display: block; width: 24px; height: 2px; background: var(--texto); transition: var(--trans); }

/* ===== MAIN ===== */
.main-content { flex: 1; margin-top: var(--nav-h); }
.tab-panel { display: none; min-height: calc(100vh - var(--nav-h) - 80px); animation: fadeIn 0.35s ease; }
.tab-panel.active { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===== PAGE HEADER ===== */
.page-header { padding: 3.5rem 2rem 2rem; max-width: 1280px; margin: 0 auto; }
.page-header-line { width: 48px; height: 3px; background: var(--acento); margin-bottom: 1rem; }
.page-header h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  color: var(--texto);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.page-header p { color: var(--texto-3); font-size: 1.1rem; font-weight: 300; margin-top: 0.4rem; }

/* ===== HERO ===== */
.hero {
  min-height: calc(100vh - var(--nav-h));
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  max-width: 1280px;
  margin: 0 auto;
  padding: 4rem 2rem;
  position: relative;
  overflow: hidden;
  gap: 2rem;
}
.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(139,0,0,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139,0,0,0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}
.hero-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--acento);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.hero-tag::before { content: ''; display: inline-block; width: 24px; height: 1px; background: var(--acento); }
.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  color: var(--texto);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  line-height: 1.1;
  margin-bottom: 1.5rem;
}
.hero-sub {
  font-size: 1.1rem;
  color: var(--texto-2);
  font-weight: 300;
  max-width: 500px;
  margin-bottom: 2.5rem;
  line-height: 1.75;
}
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero-deco { display: flex; justify-content: center; align-items: center; position: relative; }
.deco-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(139,0,0,0.12);
  animation: spin 20s linear infinite;
}
.r1 { width: 320px; height: 320px; animation-duration: 30s; }
.r2 { width: 240px; height: 240px; animation-duration: 20s; animation-direction: reverse; }
.r3 { width: 160px; height: 160px; animation-duration: 15s; border-color: rgba(139,0,0,0.2); }
@keyframes spin { to { transform: rotate(360deg); } }
.deco-circuit { width: 280px; height: 280px; opacity: 0.35; }
.deco-circuit svg { width: 100%; height: 100%; animation: spin 40s linear infinite; }

/* ===== CAPACIDADES ===== */
.quick-caps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--gris-700);
  background: var(--fondo-2);
}
.cap-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem 2rem;
  border-right: 1px solid var(--gris-700);
  cursor: pointer;
  transition: background var(--trans);
}
.cap-item:last-child { border-right: none; }
.cap-item:hover { background: var(--fondo-3); }
.cap-icon { font-size: 1.6rem; flex-shrink: 0; }
.cap-text strong { display: block; font-family: var(--font-head); font-size: 1rem; color: var(--texto); font-weight: 600; }
.cap-text span { font-size: 0.8rem; color: var(--texto-3); }

/* ===== BOTONES ===== */
.btn-primary {
  background: var(--rojo);
  color: white;
  border: none;
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.75rem 2rem;
  cursor: pointer;
  transition: background var(--trans), transform var(--trans);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}
.btn-primary:hover { background: var(--rojo-vivo); transform: translateY(-1px); }
.btn-primary.full { width: 100%; margin-top: 0.5rem; }

.btn-ghost {
  background: transparent;
  color: var(--texto-2);
  border: 1px solid var(--gris-600);
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 0.75rem 1.5rem;
  cursor: pointer;
  transition: all var(--trans);
}
.btn-ghost:hover { color: var(--texto); border-color: var(--gris-400); }

.btn-secondary {
  background: transparent;
  color: var(--rojo);
  border: 2px solid var(--rojo);
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.75rem 2rem;
  cursor: pointer;
  transition: all var(--trans);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}
.btn-secondary:hover { background: var(--rojo); color: #fff; transform: translateY(-1px); }

/* ===== SERVICIOS ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  max-width: 1280px;
  margin: 0 auto 3rem;
  padding: 0 2rem;
  background: var(--gris-700);
}
.service-card {
  background: var(--blanco);
  padding: 2rem;
  position: relative;
  transition: background var(--trans), box-shadow var(--trans);
}
.service-card:hover { background: var(--fondo-2); box-shadow: inset 0 0 0 1px var(--rojo-dim); }
.service-card.featured { background: var(--fondo-2); }
.service-card.featured::before {
  content: '★ Servicio principal';
  position: absolute;
  top: 0; right: 0;
  background: var(--rojo);
  color: white;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 3px 10px;
  letter-spacing: 0.05em;
}
.sc-number { font-family: var(--font-mono); font-size: 0.75rem; color: var(--rojo); margin-bottom: 0.75rem; }
.sc-icon { font-size: 1.8rem; margin-bottom: 1rem; }
.service-card h3 { font-size: 1.25rem; color: var(--texto); margin-bottom: 0.75rem; text-transform: uppercase; letter-spacing: 0.04em; }
.service-card p { font-size: 0.9rem; color: var(--texto-2); margin-bottom: 1rem; font-weight: 300; }
.service-card ul { list-style: none; display: flex; flex-direction: column; gap: 0.4rem; }
.service-card ul li { font-size: 0.85rem; color: var(--texto-3); padding-left: 1rem; position: relative; }
.service-card ul li::before { content: '—'; position: absolute; left: 0; color: var(--rojo); font-size: 0.7rem; }

/* ===== PROYECTOS ===== */
.filter-bar { display: flex; gap: 0.5rem; padding: 0 2rem 2rem; max-width: 1280px; margin: 0 auto; flex-wrap: wrap; }
.filter-btn {
  background: none;
  border: 1px solid var(--gris-700);
  color: var(--texto-3);
  font-family: var(--font-head);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.4rem 1.1rem;
  cursor: pointer;
  transition: all var(--trans);
}
.filter-btn:hover { border-color: var(--gris-400); color: var(--texto); }
.filter-btn.active { border-color: var(--acento); color: var(--acento); background: rgba(139,0,0,0.04); }

/* ===== GRUPOS DE PROYECTOS ===== */
.project-group { max-width: 1280px; margin: 0 auto 0.5rem; padding: 0 2rem; }
.project-group-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.2rem 0 0.8rem;
  border-bottom: 1px solid var(--gris-700);
  margin-bottom: 1px;
}
.project-group-header .pg-line { width: 32px; height: 2px; background: var(--rojo); flex-shrink: 0; }
.project-group-header h3 { font-family: var(--font-head); font-size: 1.1rem; color: var(--texto); text-transform: uppercase; letter-spacing: 0.06em; }
.project-group-header .pg-count { font-family: var(--font-mono); font-size: 0.75rem; color: var(--texto-3); margin-left: auto; }

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  max-width: 1280px;
  margin: 0 auto 0.5rem;
  padding: 0 2rem;
  background: var(--gris-700);
}
.gallery-grid-last { margin-bottom: 3rem; }

.gallery-card { background: var(--blanco); cursor: pointer; transition: opacity 0.3s ease; }
.gallery-card.hidden { display: none; }
.gc-img { position: relative; overflow: hidden; aspect-ratio: 4/3; background: var(--fondo-2); }
.gc-img img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform 0.4s ease; }
.gallery-card:hover .gc-img img { transform: scale(1.05); }
.gc-overlay {
  position: absolute; inset: 0;
  background: rgba(139,0,0,0.75);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity var(--trans);
}
.gallery-card:hover .gc-overlay { opacity: 1; }
.gc-overlay span {
  color: white;
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid white;
  padding: 0.5rem 1.5rem;
}
.gc-info { padding: 1.25rem 1.5rem; }
.gc-tag { font-family: var(--font-mono); font-size: 0.7rem; color: var(--acento); letter-spacing: 0.08em; text-transform: uppercase; display: block; margin-bottom: 0.4rem; }
.gc-info h4 { font-size: 1.05rem; color: var(--texto); margin-bottom: 0.4rem; text-transform: uppercase; }
.gc-info p { font-size: 0.85rem; color: var(--texto-3); font-weight: 300; }

/* ===== VIDEO PLACEHOLDER ===== */
.video-placeholder { background: var(--fondo-2); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0.5rem; min-height: 220px; }
.video-icon { width: 56px; height: 56px; border-radius: 50%; border: 2px solid var(--rojo); display: flex; align-items: center; justify-content: center; font-size: 1.4rem; color: var(--rojo); }
.video-label { font-family: var(--font-mono); font-size: 0.7rem; color: var(--gris-600); letter-spacing: 0.15em; }

/* ===== NOSOTROS ===== */
.about-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; max-width: 1280px; margin: 0 auto; padding: 0 2rem 3rem; }
.about-lead { font-size: clamp(1.6rem, 3vw, 2.2rem); color: var(--texto); margin-bottom: 1.5rem; text-transform: uppercase; }
.about-text p { color: var(--texto-2); font-weight: 300; margin-bottom: 1rem; }

.timeline-title { font-size: 1.1rem; color: var(--acento); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 2rem; font-family: var(--font-mono); }
.tl-item { display: flex; gap: 1.5rem; position: relative; padding-bottom: 2rem; }
.tl-item::before { content: ''; position: absolute; left: 9px; top: 20px; bottom: 0; width: 1px; background: var(--gris-700); }
.tl-item:last-child::before { display: none; }
.tl-dot { width: 20px; height: 20px; border-radius: 50%; border: 2px solid var(--gris-600); background: var(--blanco); flex-shrink: 0; margin-top: 4px; }
.tl-item.active .tl-dot { border-color: var(--acento); background: var(--rojo); }
.tl-year { font-family: var(--font-mono); font-size: 0.72rem; color: var(--acento); letter-spacing: 0.08em; text-transform: uppercase; display: block; margin-bottom: 0.3rem; }
.tl-content h4 { font-size: 1rem; color: var(--texto); margin-bottom: 0.4rem; text-transform: uppercase; }
.tl-content p { font-size: 0.88rem; color: var(--texto-3); font-weight: 300; }

.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--gris-700); background: var(--fondo-2); }
.stat { padding: 2rem; text-align: center; border-right: 1px solid var(--gris-700); }
.stat:last-child { border-right: none; }
.stat-num { font-family: var(--font-head); font-size: 2.5rem; font-weight: 700; color: var(--acento); line-height: 1; margin-bottom: 0.5rem; }
.stat-label { font-size: 0.85rem; color: var(--texto-3); text-transform: uppercase; letter-spacing: 0.06em; }

/* ===== CONTACTO ===== */
.contact-layout { display: grid; grid-template-columns: 1fr 1.4fr; gap: 4rem; max-width: 1280px; margin: 0 auto; padding: 0 2rem 4rem; }
.contact-info h3 { font-size: 1.6rem; color: var(--texto); text-transform: uppercase; margin-bottom: 1rem; }
.contact-info > p { color: var(--texto-2); font-weight: 300; margin-bottom: 2rem; }
.contact-items { display: flex; flex-direction: column; gap: 1.25rem; }
.ci { display: flex; align-items: flex-start; gap: 1rem; }
.ci-icon { font-size: 1.2rem; margin-top: 2px; }
.ci strong { display: block; color: var(--texto); font-family: var(--font-head); font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.06em; }
.ci span, .ci a { font-size: 0.9rem; color: var(--texto-3); }
.ci a:hover { color: var(--acento); }

.contact-form { display: flex; flex-direction: column; gap: 1rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-group { display: flex; flex-direction: column; gap: 0.4rem; }
.form-group label { font-family: var(--font-head); font-size: 0.85rem; color: var(--texto-2); text-transform: uppercase; letter-spacing: 0.06em; }
.form-group input, .form-group select, .form-group textarea {
  background: var(--blanco);
  border: 1px solid var(--gris-700);
  color: var(--texto);
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 0.7rem 1rem;
  transition: border-color var(--trans);
  outline: none;
  resize: vertical;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--acento); }
.form-group select { appearance: none; cursor: pointer; }
.form-success { display: none; background: rgba(33,115,70,0.1); border: 1px solid #217346; color: #1a5c35; padding: 0.75rem 1rem; font-size: 0.9rem; font-family: var(--font-mono); text-align: center; }
.form-success.visible { display: block; }

/* Form messages */
.form-msg {
  display: none;
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  text-align: center;
}
.form-msg.visible { display: block; }
.form-msg--ok { background: rgba(33,115,70,0.1); border: 1px solid #217346; color: #1a5c35; }
.form-msg--err { background: rgba(139,0,0,0.08); border: 1px solid var(--rojo); color: var(--rojo); }
.form-msg--err a { color: var(--rojo); text-decoration: underline; }

/* WhatsApp box */
.whatsapp-box {
  margin-top: 2.5rem;
  background: var(--blanco);
  border: 1px solid var(--gris-800);
  border-radius: 8px;
  padding: 1.5rem;
}
.wa-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}
.wa-icon {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: #e8f5e9;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.wa-header strong {
  display: block;
  font-family: var(--font-head);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--texto);
}
.wa-header span {
  font-size: 0.82rem;
  color: var(--texto-3);
}
.wa-qr-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1.25rem;
}
#wa-qr { display: flex; justify-content: center; }
#wa-qr img { border-radius: 6px; }
.wa-scan {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gris-500);
}
.wa-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.7rem 1rem;
  background: #25D366;
  color: #fff;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  border-radius: 6px;
  text-decoration: none;
  transition: background 0.2s;
}
.wa-btn:hover { background: #1ebe5a; color: #fff; }

/* ===== FOOTER ===== */
.footer { background: var(--fondo-2); border-top: 1px solid var(--gris-700); padding: 2rem 0; }
.footer-inner { max-width: 1280px; margin: 0 auto; padding: 0 2rem; display: flex; align-items: center; gap: 2rem; flex-wrap: wrap; }
.footer-logo { height: 36px; opacity: 0.6; }
.footer-links { display: flex; gap: 1rem; flex-wrap: wrap; }
.footer-links button { background: none; border: none; color: var(--texto-3); font-family: var(--font-head); font-size: 0.85rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; cursor: pointer; transition: color var(--trans); }
.footer-links button:hover { color: var(--acento); }
.footer-copy { font-size: 0.78rem; color: var(--gris-600); margin-left: auto; font-family: var(--font-mono); }

/* ===== HOME FEATURED ===== */
.home-featured {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 2rem 4rem;
}
.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--acento);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.section-label::before { content: ''; display: inline-block; width: 32px; height: 1px; background: var(--acento); }
.featured-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--gris-700);
}
.featured-card {
  background: var(--blanco);
  cursor: pointer;
  transition: background var(--trans);
  overflow: hidden;
}
.featured-card:hover { background: var(--fondo-2); }
.featured-card img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}
.featured-card:hover img { transform: scale(1.04); }
.fc-info { padding: 1rem 1.25rem 1.25rem; }
.fc-cat {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--acento);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 0.35rem;
}
.fc-info h4 { font-size: 0.95rem; color: var(--texto); text-transform: uppercase; margin-bottom: 0.3rem; }
.fc-info p { font-size: 0.8rem; color: var(--texto-3); font-weight: 300; }

/* ===== HERO STATS ===== */
.hero-stats {
  display: flex;
  gap: 2rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--gris-700);
  flex-wrap: wrap;
}
.hero-stats .stat {
  padding: 0;
  border: none;
  text-align: left;
}
.hero-stats .stat-num { font-size: 2rem; }
.hero-stats .stat-label { font-size: 0.78rem; }

/* ===== ABOUT STATS ===== */
.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--gris-700);
  max-width: 1280px;
  margin: 0 auto 3rem;
  padding: 0 2rem;
}
.about-stats .stat {
  padding: 2rem;
  text-align: center;
  background: var(--blanco);
  border: none;
}

/* ===== RESPONSIVE — TABLET (≤1024px) ===== */
@media (max-width: 1024px) {
  .services-grid  { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid   { grid-template-columns: repeat(2, 1fr); }
  .quick-caps     { grid-template-columns: repeat(2, 1fr); }
  .hero           { grid-template-columns: 1fr; min-height: auto; padding: 3rem 2rem; }
  .hero-deco      { display: none; }
  .hero-stats     { display: flex; flex-direction: row; gap: 2rem; flex-wrap: wrap; }
  .stats-row      { grid-template-columns: repeat(2, 1fr); }
  .about-layout   { grid-template-columns: 1fr; gap: 2rem; }
  .contact-layout { grid-template-columns: 1fr; gap: 2rem; }
  .footer-inner   { flex-direction: column; align-items: flex-start; gap: 1rem; }
  .footer-copy    { margin-left: 0; }

  /* Featured grid responsive */
  .featured-grid  { grid-template-columns: repeat(2, 1fr) !important; }

  /* About stats */
  .about-stats    { grid-template-columns: repeat(2, 1fr) !important; }
}

/* ===== RESPONSIVE — MOBILE (≤768px) ===== */
@media (max-width: 768px) {
  :root { --nav-h: 60px; font-size: 15px; }

  /* Navbar */
  .nav-inner      { padding: 0 1rem; gap: 0.75rem; }
  .nav-tabs       { display: none; }
  .hamburger      { display: flex; margin-left: auto; }
  .nav-tabs.open  {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    background: var(--fondo);
    border-bottom: 2px solid var(--rojo);
    padding: 0.5rem 1rem 1rem;
    gap: 0;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    z-index: 999;
  }
  .nav-tabs.open .tab-btn {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--gris-800);
    font-size: 1rem;
  }
  .nav-tabs.open .tab-btn:last-child { border-bottom: none; }

  /* Layout */
  .hero           { padding: 2rem 1rem; min-height: auto; }
  .hero-title     { font-size: clamp(1.8rem, 7vw, 2.8rem); }
  .hero-sub       { font-size: 1rem; }
  .hero-actions   { flex-direction: column; gap: 0.75rem; }
  .hero-actions .btn-primary,
  .hero-actions .btn-secondary { width: 100%; text-align: center; }
  .hero-stats     { flex-direction: row; flex-wrap: wrap; gap: 1rem; padding-top: 1.5rem; }
  .stat           { min-width: 80px; padding: 0.75rem; }

  .page-header    { padding: 1.5rem 1rem 1rem; }
  .page-header h2 { font-size: clamp(1.6rem, 6vw, 2.4rem); }

  /* Services */
  .services-grid  { grid-template-columns: 1fr; padding: 0 1rem; }
  .service-card   { padding: 1.5rem 1.25rem; }

  /* Gallery */
  .gallery-grid   { grid-template-columns: 1fr; padding: 0 1rem; }
  .filter-bar     { padding: 0 1rem 1.5rem; gap: 0.4rem; }
  .filter-btn     { font-size: 0.75rem; padding: 0.35rem 0.75rem; }
  .gallery-section-header { margin: 1.5rem 0 0.25rem; }

  /* Featured */
  .featured-grid  { grid-template-columns: 1fr !important; padding: 0 1rem !important; }
  .home-featured  { padding: 0 1rem !important; }

  /* About */
  .about-layout   { padding: 0 1rem 2rem; gap: 1.5rem; }
  .about-stats    { grid-template-columns: repeat(2, 1fr) !important; padding: 0 1rem !important; }

  /* Contact */
  .contact-layout { padding: 0 1rem 2rem; gap: 1.5rem; }
  .form-row       { grid-template-columns: 1fr; }
  .whatsapp-box   { margin-top: 2rem; padding: 1.25rem; }
  .wa-qr-wrap     { display: none; } /* En móvil el usuario ya tiene WhatsApp, mostrar solo botón */

  /* Footer */
  .footer-inner   { padding: 0 1rem; flex-direction: column; gap: 1rem; }
  .footer-copy    { margin-left: 0; font-size: 0.72rem; }
  .footer-links   { gap: 0.5rem; flex-wrap: wrap; }

  /* Timeline */
  .timeline { padding-top: 1rem; }
}

/* ===== RESPONSIVE — SMALL MOBILE (≤420px) ===== */
@media (max-width: 420px) {
  .hero-title     { font-size: 1.7rem; }
  .hero-stats     { gap: 0.5rem; }
  .stat-num       { font-size: 1.8rem; }
  .filter-btn     { font-size: 0.7rem; padding: 0.3rem 0.6rem; }
  .gc-info h4     { font-size: 0.95rem; }
  .service-card h3 { font-size: 1.1rem; }
  .contact-form h3, .contact-info h3 { font-size: 1.3rem; }
  .about-stats    { grid-template-columns: repeat(2, 1fr) !important; }
  .footer-inner   { gap: 0.75rem; }
}

/* ===== ANTES / DESPUÉS ===== */
.before-after-container { position: relative; overflow: hidden; }
.before-after-container .img-before,
.before-after-container .img-after {
  width: 100%; height: 100%; object-fit: cover;
  display: block;
  transition: opacity 0.4s ease;
  position: absolute; top: 0; left: 0;
}
.before-after-container .img-before { position: relative; }
.before-after-container .img-after { opacity: 0; }
.antes-despues:hover .img-after { opacity: 1; }
.antes-despues:hover .img-before { opacity: 0; }

.before-after-label {
  position: absolute; bottom: 8px; left: 0; right: 0;
  display: flex; justify-content: space-between;
  padding: 0 10px; pointer-events: none; z-index: 2;
}
.label-before, .label-after {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  padding: 2px 8px;
  border-radius: 2px;
}
.label-before { background: rgba(139,0,0,0.85); color: white; }
.label-after  { background: rgba(33,115,70,0.85); color: white; }
.antes-despues:hover .label-before { opacity: 0; }