/* ============================================
   HUMEDAD CIMIENTOS — Main Stylesheet
   Color Palette from Logo:
   --dark:    #1E1E1E  (near-black text)
   --charcoal:#2B2B2B  (dark gray)
   --accent:  #C43A18  (warm red-orange from logo banner)
   --silver:  #C4C4C4  (metallic silver)
   --light:   #F5F4F2  (off-white background)
   --white:   #FFFFFF
============================================ */

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --dark:     #1E1E1E;
    --charcoal: #2B2B2B;
    --accent:   #C43A18;
    --accent-dk:#A02E12;
    --silver:   #C4C4C4;
    --light:    #F5F4F2;
    --white:    #FFFFFF;
    --border:   #E2E0DC;
    --text-muted: #7A7A7A;
    --header-h: 110px;
    --transition: 0.3s ease;
    --shadow: 0 4px 24px rgba(0,0,0,0.09);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.13);
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Open Sans', sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--dark);
    background: var(--white);
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ---- Typography ---- */
h1, h2, h3, h4, h5 {
    font-family: 'Montserrat', sans-serif;
    line-height: 1.2;
    font-weight: 700;
    color: var(--charcoal);
}

.section-label {
    display: inline-block;
    font-family: 'Montserrat', sans-serif;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    margin-bottom: 20px;
}

.section-title span { color: var(--accent); }

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-muted);
    max-width: 600px;
    margin-bottom: 48px;
}

/* ---- Layout ---- */
.container {
    max-width: 1160px;
    margin: 0 auto;
    padding: 0 24px;
}

section {
    padding: 100px 0;
}

section:nth-child(even) {
    background: var(--light);
}

/* ---- Header ---- */
#site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--header-h);
    z-index: 1000;
    background: rgba(255,255,255,0.97);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(8px);
    transition: height 0.4s ease, box-shadow 0.4s ease;
}

#site-header.scrolled {
    height: 64px;
    box-shadow: 0 2px 20px rgba(0,0,0,0.10);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo-link { display: flex; align-items: center; }
.logo {
    height: 90px;
    width: auto;
    transition: height 0.4s ease;
}

#site-header.scrolled .logo { height: 44px; }

/* ---- Nav ---- */
.nav-menu {
    display: flex;
    gap: 6px;
    align-items: center;
}

.nav-menu a {
    font-family: 'Montserrat', sans-serif;
    font-size: 12.5px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--charcoal);
    padding: 6px 12px;
    border-radius: 4px;
    transition: color var(--transition), background var(--transition);
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--accent);
    background: rgba(196,58,24,0.07);
}

.nav-menu li:last-child a {
    color: var(--accent);
    border: 1.5px solid var(--accent);
    padding: 6px 16px;
}

.nav-menu li:last-child a:hover {
    background: var(--accent);
    color: var(--white);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
}

.nav-toggle span {
    display: block;
    width: 26px;
    height: 2px;
    background: var(--charcoal);
    transition: all var(--transition);
}

/* ---- Hero ---- */
#inicio {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    background: var(--charcoal);
    padding: 0;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    opacity: 0.48;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 140px 24px 100px;
    width: 100%;
}

.hero-logo {
    width: 200px;
    margin: 0 auto 40px;
    border-radius: 8px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

.hero-tagline {
    font-family: 'Montserrat', sans-serif;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 5px;
    text-transform: uppercase;
    color: var(--silver);
    margin-bottom: 20px;
}

.hero-title {
    font-size: clamp(2.4rem, 6vw, 4.2rem);
    color: var(--white);
    margin-bottom: 20px;
    line-height: 1.1;
}

.hero-title span {
    color: var(--accent);
    text-shadow: 0 2px 6px rgba(0,0,0,0.65), 0 1px 2px rgba(0,0,0,0.8);
}

.hero-sub {
    font-size: 1.15rem;
    color: rgba(255,255,255,0.7);
    max-width: 520px;
    margin: 0 auto 48px;
    font-weight: 300;
}

.hero-cta {
    display: inline-flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.btn {
    display: inline-block;
    font-family: 'Montserrat', sans-serif;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    padding: 14px 32px;
    border-radius: 4px;
    transition: all var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--accent);
    color: var(--white);
    border-color: var(--accent);
}

.btn-primary:hover {
    background: var(--accent-dk);
    border-color: var(--accent-dk);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(196,58,24,0.35);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: rgba(255,255,255,0.5);
}

.btn-outline:hover {
    border-color: var(--white);
    background: rgba(255,255,255,0.1);
    transform: translateY(-2px);
}

.scroll-down {
    position: absolute;
    bottom: 36px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255,255,255,0.5);
    font-size: 22px;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* ---- Quienes Somos ---- */
#quienes-somos { background: var(--white); }

.qs-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.qs-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-top: 40px;
}

.feature-card {
    padding: 28px 24px;
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: all var(--transition);
}

.feature-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow);
    transform: translateY(-4px);
}

.feature-card .icon {
    width: 44px;
    height: 44px;
    background: rgba(196,58,24,0.1);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
    color: var(--accent);
    font-size: 18px;
}

.feature-card h4 {
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.feature-card p {
    font-size: 13.5px;
    color: var(--text-muted);
    line-height: 1.6;
}

.qs-image-wrap {
    position: relative;
}

.qs-image {
    border-radius: 8px;
    width: 100%;
    object-fit: cover;
    aspect-ratio: 4/5;
    box-shadow: var(--shadow-lg);
}

.qs-badge {
    position: absolute;
    bottom: -24px;
    right: -24px;
    background: var(--accent);
    color: var(--white);
    text-align: center;
    padding: 24px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.qs-badge strong {
    display: block;
    font-size: 2.4rem;
    font-family: 'Montserrat', sans-serif;
    font-weight: 800;
    line-height: 1;
}

.qs-badge span {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.9;
}

/* ---- El Problema ---- */
#el-problema { background: var(--light); }

.problema-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.problema-list {
    margin: 32px 0;
}

.problema-list li {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    margin-bottom: 20px;
    font-size: 15px;
    line-height: 1.65;
    color: var(--charcoal);
}

.problema-list li i {
    color: var(--accent);
    font-size: 16px;
    margin-top: 3px;
    flex-shrink: 0;
}

.problema-photos {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.problema-photos img {
    border-radius: 6px;
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    box-shadow: var(--shadow);
    transition: transform var(--transition);
}

.problema-photos img:hover { transform: scale(1.03); }
.problema-photos img:first-child { grid-column: 1 / -1; aspect-ratio: 16/9; }

/* ---- Tratamiento ---- */
#tratamiento { background: var(--white); }

.tratamiento-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.tratamiento-steps {
    counter-reset: step;
    margin-top: 32px;
}

.step {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    margin-bottom: 32px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border);
}

.step:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }

.step-num {
    width: 44px;
    height: 44px;
    min-width: 44px;
    background: var(--accent);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Montserrat', sans-serif;
    font-weight: 800;
    font-size: 16px;
}

.step-body h4 {
    font-size: 15px;
    margin-bottom: 6px;
    font-weight: 700;
}

.step-body p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.65;
}

.tratamiento-image-stack {
    position: relative;
    padding: 20px 20px 40px 0;
}

.tratamiento-image-stack img {
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    object-fit: cover;
}

.tratamiento-image-stack .img-main {
    aspect-ratio: 4/5;
    position: relative;
    z-index: 2;
}

.tratamiento-image-stack .img-accent {
    position: absolute;
    bottom: 0;
    right: -20px;
    width: 55%;
    aspect-ratio: 1;
    z-index: 3;
    border: 4px solid var(--white);
}

/* ---- Productos ---- */
#productos { background: var(--charcoal); }

#productos .section-label { color: var(--silver); }
#productos .section-title { color: var(--white); }
#productos .section-subtitle { color: rgba(255,255,255,0.6); }

.productos-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.producto-card {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 10px;
    padding: 40px 32px;
    text-align: center;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.producto-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--accent);
    transform: scaleX(0);
    transition: transform var(--transition);
}

.producto-card:hover {
    background: rgba(255,255,255,0.09);
    transform: translateY(-6px);
    box-shadow: 0 16px 40px rgba(0,0,0,0.3);
}

.producto-card:hover::before { transform: scaleX(1); }

.producto-card .product-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 24px;
    background: rgba(196,58,24,0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    color: var(--accent);
}

.producto-card h3 {
    font-size: 1rem;
    font-weight: 800;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--white);
    margin-bottom: 16px;
}

.producto-card p {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    line-height: 1.7;
}

.producto-card .product-badge {
    display: inline-block;
    margin-top: 20px;
    padding: 4px 14px;
    border: 1px solid rgba(196,58,24,0.5);
    border-radius: 20px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--accent);
}

.producto-img-wrap {
    margin-top: 60px;
    text-align: center;
}

.producto-img-wrap img {
    max-width: 260px;
    margin: 0 auto;
    filter: drop-shadow(0 20px 40px rgba(0,0,0,0.5));
    transition: transform var(--transition);
}

.producto-img-wrap img:hover { transform: scale(1.04) rotate(-2deg); }

/* ---- Garantia ---- */
#garantia { background: var(--light); }

.garantia-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.garantia-highlight {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 32px;
    background: var(--white);
    border-radius: 10px;
    border-left: 4px solid var(--accent);
    margin: 32px 0;
    box-shadow: var(--shadow);
}

.garantia-years {
    font-family: 'Montserrat', sans-serif;
    font-size: 4rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
    white-space: nowrap;
}

.garantia-years-label {
    font-family: 'Montserrat', sans-serif;
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--charcoal);
}

.garantia-years-label span {
    display: block;
    font-weight: 400;
    font-size: 13px;
    color: var(--text-muted);
    text-transform: none;
    letter-spacing: 0;
    margin-top: 4px;
    line-height: 1.5;
}

.garantia-note {
    font-size: 14px;
    color: var(--text-muted);
    background: rgba(196,58,24,0.06);
    border-radius: 6px;
    padding: 16px 20px;
    border-left: 3px solid var(--accent);
    line-height: 1.7;
}

.garantia-cert {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.garantia-cert img {
    width: 100%;
    display: block;
}

/* ---- Contacto ---- */
#contacto { background: var(--white); }

.contacto-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.contact-items { margin-top: 32px; }

.contact-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    margin-bottom: 32px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border);
}

.contact-item:last-child { border-bottom: none; }

.contact-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    background: rgba(196,58,24,0.09);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--accent);
}

.contact-item h4 {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.contact-item a, .contact-item p {
    font-size: 15px;
    color: var(--charcoal);
    transition: color var(--transition);
}

.contact-item a:hover { color: var(--accent); }

.social-links {
    display: flex;
    gap: 12px;
    margin-top: 32px;
}

.social-link {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    background: var(--light);
    color: var(--charcoal);
    transition: all var(--transition);
    border: 1px solid var(--border);
}

.social-link:hover {
    background: var(--accent);
    color: var(--white);
    border-color: var(--accent);
    transform: translateY(-3px);
}

/* Contact right: CTA box */
.contact-cta-box {
    background: var(--charcoal);
    border-radius: 10px;
    padding: 48px 40px;
    color: var(--white);
    text-align: center;
    position: sticky;
    top: calc(var(--header-h) + 24px);
}

.contact-cta-box .cta-icon {
    width: 72px;
    height: 72px;
    background: rgba(196,58,24,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    color: var(--accent);
    margin: 0 auto 24px;
}

.contact-cta-box h3 {
    color: var(--white);
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.contact-cta-box p {
    color: rgba(255,255,255,0.65);
    font-size: 14px;
    margin-bottom: 32px;
    line-height: 1.7;
}

.contact-cta-box .btn-whatsapp {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background: #25D366;
    color: var(--white);
    padding: 16px 32px;
    border-radius: 50px;
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all var(--transition);
    margin-bottom: 16px;
}

.contact-cta-box .btn-whatsapp:hover {
    background: #1ebe59;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(37,211,102,0.35);
}

.contact-cta-box .btn-whatsapp i { font-size: 20px; }

.contact-cta-box .btn-email {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background: transparent;
    color: rgba(255,255,255,0.8);
    border: 1px solid rgba(255,255,255,0.2);
    padding: 14px 32px;
    border-radius: 50px;
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    font-size: 13px;
    transition: all var(--transition);
}

.contact-cta-box .btn-email:hover {
    border-color: rgba(255,255,255,0.5);
    color: var(--white);
}

/* ---- WhatsApp Float ---- */
.whatsapp-float {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 58px;
    height: 58px;
    background: #25D366;
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    box-shadow: 0 4px 20px rgba(37,211,102,0.45);
    z-index: 999;
    transition: all var(--transition);
}

.whatsapp-float:hover {
    background: #1ebe59;
    transform: scale(1.1);
    box-shadow: 0 6px 28px rgba(37,211,102,0.55);
}

/* ---- Footer ---- */
#site-footer {
    background: var(--dark);
    color: rgba(255,255,255,0.7);
    padding: 70px 0 0;
}

.footer-inner {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-logo { height: 54px; width: auto; margin-bottom: 16px; border-radius: 4px; }

.footer-tagline {
    font-size: 13.5px;
    line-height: 1.7;
    color: rgba(255,255,255,0.5);
    margin-bottom: 14px;
}

.footer-body {
    font-size: 13px;
    line-height: 1.75;
    color: rgba(255,255,255,0.4);
    margin-bottom: 14px;
}

.footer-keywords {
    font-size: 11.5px;
    line-height: 1.8;
    color: rgba(255,255,255,0.25);
    font-style: italic;
}

.footer-col h4 {
    color: var(--white);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 20px;
}

.footer-links li + li { margin-top: 4px; }
.footer-links a {
    font-size: 13.5px;
    color: rgba(255,255,255,0.55);
    transition: color var(--transition);
}
.footer-links a:hover { color: var(--accent); }

.contact-list li + li { margin-top: 12px; }
.contact-list a {
    font-size: 13.5px;
    color: rgba(255,255,255,0.55);
    display: flex;
    align-items: center;
    gap: 10px;
    transition: color var(--transition);
}
.contact-list a:hover { color: var(--accent); }
.contact-list i { color: var(--accent); font-size: 15px; width: 16px; }

.footer-bottom {
    padding: 20px 0;
    text-align: center;
    font-size: 12.5px;
    color: rgba(255,255,255,0.3);
}

/* ---- Multimedia Page ---- */
.multimedia-hero {
    background: var(--charcoal);
    padding: 160px 0 80px;
    text-align: center;
}

.multimedia-hero h1 { color: var(--white); }
.multimedia-hero p { color: rgba(255,255,255,0.6); margin: 12px auto 0; max-width: 500px; font-size: 15px; }

.gallery-section { padding: 80px 0; }
.gallery-section:nth-child(odd) { background: var(--white); }
.gallery-section:nth-child(even) { background: var(--light); }

.gallery-section h2 { margin-bottom: 40px; }

.photo-grid {
    columns: 4;
    column-gap: 12px;
}

.photo-grid .photo-item {
    break-inside: avoid;
    margin-bottom: 12px;
    border-radius: 6px;
    overflow: hidden;
    cursor: pointer;
    position: relative;
}

.photo-grid .photo-item img {
    width: 100%;
    display: block;
    transition: transform 0.4s ease;
}

.photo-grid .photo-item:hover img { transform: scale(1.05); }

.photo-grid .photo-item .photo-overlay {
    position: absolute;
    inset: 0;
    background: rgba(30,30,30,0);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition);
}

.photo-grid .photo-item:hover .photo-overlay { background: rgba(30,30,30,0.35); }

.photo-grid .photo-item .photo-overlay i {
    color: var(--white);
    font-size: 26px;
    opacity: 0;
    transform: scale(0.8);
    transition: all var(--transition);
}

.photo-grid .photo-item:hover .photo-overlay i {
    opacity: 1;
    transform: scale(1);
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.video-card {
    border-radius: 8px;
    overflow: hidden;
    background: var(--white);
    box-shadow: var(--shadow);
    transition: all var(--transition);
}

.video-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.video-card video {
    width: 100%;
    display: block;
    max-height: 280px;
    object-fit: cover;
    background: var(--dark);
}

.video-card-label {
    padding: 14px 16px;
    font-family: 'Montserrat', sans-serif;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 8px;
}

.video-card-label i { color: var(--accent); }

/* ---- Lightbox ---- */
.lightbox {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(0,0,0,0.92);
    align-items: center;
    justify-content: center;
}

.lightbox.open { display: flex; }

.lightbox-inner {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    margin-bottom: 60px;
}

.lightbox-inner img {
    max-width: 90vw;
    max-height: 85vh;
    border-radius: 4px;
    object-fit: contain;
}

.lightbox-close {
    position: fixed;
    top: 20px;
    right: 28px;
    color: var(--white);
    font-size: 38px;
    cursor: pointer;
    background: none;
    border: none;
    opacity: 0.75;
    transition: opacity var(--transition);
    line-height: 1;
    z-index: 10;
}

.lightbox-close:hover { opacity: 1; }

.lightbox-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    color: var(--white);
    font-size: 24px;
    cursor: pointer;
    background: rgba(255,255,255,0.12);
    border: none;
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition);
}

.lightbox-nav:hover { background: rgba(255,255,255,0.25); }
.lightbox-prev { left: -64px; }
.lightbox-next { right: -64px; }

.lightbox-thumbs {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    padding: 12px 20px;
    justify-content: center;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(6px);
}

.lightbox-thumb {
    width: 64px;
    height: 64px;
    flex-shrink: 0;
    object-fit: cover;
    border-radius: 4px;
    cursor: pointer;
    opacity: 0.45;
    border: 2px solid transparent;
    margin: 0 3px;
    overflow: hidden;
    transition: width 0.3s ease, opacity 0.3s ease, border-color 0.25s ease, margin 0.3s ease;
}

.lightbox-thumb.thumb-hidden {
    width: 0;
    opacity: 0;
    margin: 0;
    border-color: transparent;
    pointer-events: none;
}

.lightbox-thumb:hover { opacity: 0.8; }

.lightbox-thumb.active {
    opacity: 1;
    border-color: var(--accent);
}

/* ---- Scroll reveal ---- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.reveal-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal-right.visible {
    opacity: 1;
    transform: translateX(0);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }

/* ---- Responsive ---- */
@media (max-width: 1024px) {
    .qs-grid,
    .problema-grid,
    .tratamiento-content,
    .garantia-grid,
    .contacto-grid { grid-template-columns: 1fr; gap: 48px; }

    .qs-badge { bottom: -12px; right: -12px; }

    .tratamiento-image-stack .img-accent { display: none; }

    .productos-grid { grid-template-columns: 1fr 1fr; }

    .footer-inner { grid-template-columns: 1fr 1fr; }

    .photo-grid { columns: 3; }
    .video-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    :root { --header-h: 80px; }

    .logo { height: 66px; }
    #site-header.scrolled .logo { height: 52px; }

    section { padding: 70px 0; }

    .nav-toggle { display: flex; }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0; right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 20px 24px 28px;
        gap: 4px;
        border-bottom: 1px solid var(--border);
        box-shadow: 0 8px 24px rgba(0,0,0,0.1);
    }

    .nav-menu.open { display: flex; }

    .nav-menu a { padding: 10px 14px; font-size: 13px; }
    .nav-menu li:last-child a { margin-top: 8px; text-align: center; }

    .hero-logo { width: 140px; }
    .hero-title { font-size: 2rem; }

    .qs-features { grid-template-columns: 1fr; }

    .qs-badge { position: static; margin-top: 20px; display: inline-flex; gap: 12px; padding: 16px 24px; align-items: center; }
    .qs-badge strong { font-size: 1.8rem; }

    .productos-grid { grid-template-columns: 1fr; }

    .photo-grid { columns: 2; }
    .video-grid { grid-template-columns: 1fr; }

    .footer-inner { grid-template-columns: 1fr; gap: 32px; }

    .lightbox-prev { left: -44px; }
    .lightbox-next { right: -44px; }

    .whatsapp-float { bottom: 20px; right: 20px; width: 52px; height: 52px; font-size: 24px; }
}

@media (max-width: 480px) {
    .photo-grid { columns: 2; }
    .contact-cta-box { padding: 32px 24px; }
    .lightbox-nav { display: none; }
}