:root {
    --azul-profundo: #344C5F;
    --arena: #CBA666;
    --tierra: #795935;
    --blanco: #FFFFFF;
    --gris-claro: #F5F7FA;
    --transicion: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Montserrat', sans-serif;
    scroll-behavior: smooth;
}

body {
    background-color: var(--blanco);
    color: var(--azul-profundo);
    overflow-x: hidden;
}

/* Utilidades de animación */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: var(--transicion);
}

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

/* HEADER */
header {
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    background: var(--azul-profundo);
    padding: 15px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    transition: var(--transicion);
}

header.scrolled {
    padding: 10px 5%;
    background: rgba(52, 76, 95, 0.95);
    backdrop-filter: blur(10px);
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 55px;
    transition: var(--transicion);
}

header.scrolled .logo img {
    height: 45px;
}

nav {
    display: flex;
    gap: 30px;
}

nav a {
    text-decoration: none;
    color: var(--blanco);
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: var(--transicion);
    position: relative;
}

nav a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    background: var(--arena);
    bottom: -5px;
    left: 0;
    transition: var(--transicion);
}

nav a:hover::after {
    width: 100%;
}

nav a:hover {
    color: var(--arena);
}

/* HERO */
.hero {
    height: 100vh;
    background: linear-gradient(135deg, rgba(52, 76, 95, 0.85) 0%, rgba(52, 76, 95, 0.6) 100%),
                url('assets/portada_spt_labo.png') left center/cover no-repeat;        
    display: flex;
    align-items: center;
    padding: 0 5%;
    color: var(--blanco);
    position: relative;
}

.hero-content {
    max-width: 800px;
    z-index: 2;
}

.hero h1 {
    font-size: 72px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 25px;
    text-transform: uppercase;
    letter-spacing: -1px;
}

.hero h1 span {
    color: var(--arena);
}

.hero-bar {
    width: 80px;
    height: 6px;
    background: var(--arena);
    margin-bottom: 30px;
    transition: width 0.5s ease;
}

.hero:hover .hero-bar {
    width: 150px;
}

.hero p {
    font-size: 20px;
    line-height: 1.6;
    font-weight: 300;
    max-width: 600px;
    margin-bottom: 40px;
}

.hero-btn {
    display: inline-block;
    padding: 18px 40px;
    background: var(--arena);
    color: var(--azul-profundo);
    text-decoration: none;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: 4px;
    transition: var(--transicion);
    border: 2px solid var(--arena);
}

.hero-btn:hover {
    background: transparent;
    color: var(--arena);
}

.scroll-down {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--blanco);
    font-size: 24px;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0) translateX(-50%); }
    40% { transform: translateY(-20px) translateX(-50%); }
    60% { transform: translateY(-10px) translateX(-50%); }
}

/* GENERAL SECTION */
section {
    padding: 100px 5%;
}

.section-header {
    margin-bottom: 60px;
}

.section-title {
    font-size: 48px;
    font-weight: 800;
    color: var(--azul-profundo);
    text-transform: uppercase;
    letter-spacing: -1px;
    margin-bottom: 15px;
}

.section-bar {
    width: 80px;
    height: 6px;
    background: var(--arena);
}

/* ABOUT */
.about {
    background-color: var(--blanco);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
}

.about-content {
    flex: 1;
}

.about-content p {
    font-size: 18px;
    line-height: 1.8;
    color: #555;
    margin-bottom: 20px;
}

.about-image {
    flex: 1;
    position: relative;
}

.about-image img {
    display: block;
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 20px 40px rgba(52, 76, 95, 0.15);
}

.about-image::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: var(--arena);
    top: 20px;
    left: -20px;
    z-index: -1;
    border-radius: 8px;
}

.about-image::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background: linear-gradient(135deg, rgba(52, 76, 95, 0.4) 0%, rgba(52, 76, 95, 0.4) 100%);
    border-radius: 8px;
    pointer-events: none;
}

/* SERVICES */
.services {
    background-color: var(--gris-claro);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.service-card-wrapper {
    padding-top: 10px;
    background: transparent;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.service-card {
    flex: 1;
    background: var(--blanco);
    padding: 50px 40px;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.04);
    transition: var(--transicion);
    border-bottom: 4px solid transparent;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 0;
    background: var(--azul-profundo);
    z-index: -1;
    transition: var(--transicion);
}

.service-card-wrapper:hover .service-card::before {
    height: 100%;
}

.service-card-wrapper:hover .service-card {
    transform: translateY(-10px);
    border-bottom-color: var(--arena);
    box-shadow: 0 20px 40px rgba(52, 76, 95, 0.2);
}

.service-icon {
    font-size: 40px;
    color: var(--arena);
    margin-bottom: 25px;
    transition: var(--transicion);
}

.service-card h3 {
    font-size: 24px;
    margin-bottom: 15px;
    font-weight: 700;
    color: var(--azul-profundo);
    transition: var(--transicion);
}

.service-card p {
    color: #666;
    line-height: 1.6;
    transition: var(--transicion);
}

.service-card-wrapper:hover .service-card h3,
.service-card-wrapper:hover .service-card p {
    color: var(--blanco);
}

/* STANDARDS / CTA BAND */
.standards {
    background: var(--tierra);
    color: var(--blanco);
    padding: 60px 5%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.standards-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 30px;
    max-width: 900px;
    width: 100%;
}

.standards-icon {
    width: 72px;
    height: 72px;
    color: var(--blanco);
    flex-shrink: 0;
    stroke-width: 2.2;
}

.standards-text {
    font-size: 26px;
    font-weight: 500;
    line-height: 1.4;
    color: var(--blanco);
    letter-spacing: -0.3px;
}

@media (max-width: 768px) {
    .standards {
        padding: 50px 5%;
    }
    .standards-container {
        gap: 20px;
    }
    .standards-icon {
        width: 56px;
        height: 56px;
    }
    .standards-text {
        font-size: 18px;
    }
}

@media (max-width: 480px) {
    .standards-container {
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }
}

/* CONTACT CTA */
.contact-cta {
    background: linear-gradient(rgba(52, 76, 95, 0.9), rgba(52, 76, 95, 0.9)), url('assets/perfil_fondo.jpg') center/cover;
    padding: 100px 5%;
    text-align: center;
    color: var(--blanco);
}

.contact-cta h2 {
    font-size: 40px;
    font-weight: 800;
    margin-bottom: 30px;
}

.contact-cta p {
    font-size: 18px;
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* FOOTER */
footer {
    background: #1F2E3A; /* Más oscuro que el azul profundo */
    color: var(--blanco);
    padding: 60px 5% 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 60px;
}

.footer-logo img {
    width: 200px;
    margin-bottom: 20px;
}

.footer-col h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--arena);
    text-transform: uppercase;
}

.footer-col p, .footer-col a {
    color: #A0B0BE;
    text-decoration: none;
    line-height: 1.8;
    display: block;
    margin-bottom: 10px;
    transition: var(--transicion);
}

.footer-col a:hover {
    color: var(--arena);
    transform: translateX(5px);
}

.footer-col a.phone-link {
    display: inline;
    margin-bottom: 0;
    transition: color 0.4s ease;
}

.footer-col a.phone-link:hover {
    color: var(--arena);
    transform: none;
}

.footer-social {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.footer-social a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.05);
    border-radius: 50%;
    color: var(--blanco);
}

.footer-social a:hover {
    background: var(--arena);
    transform: translateY(-3px);
    color: var(--azul-profundo);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: #A0B0BE;
    font-size: 14px;
}

/* RESPONSIVE */
@media (max-width: 992px) {
    .hero h1 { font-size: 56px; }
    .about { flex-direction: column; }
    .about-image { margin-top: 40px; width: 100%; max-width: 600px; }
}

@media (max-width: 768px) {
    header { padding: 15px 5%; flex-direction: column; gap: 15px; }
    nav { gap: 15px; flex-wrap: wrap; justify-content: center; }
    .hero h1 { font-size: 42px; }
    .section-title { font-size: 36px; }
    .hero { text-align: center; }
    .hero-bar { margin: 0 auto 30px; }
    .scroll-down { display: none; }
}

/* WHATSAPP FLOAT BUTTON */
.whatsapp-float {
    position: fixed;
    width: 60px;
    height: 60px;
    bottom: 30px;
    right: 30px;
    background-color: #25D366;
    color: #FFFFFF;
    border-radius: 50%;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.25);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 32px;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.whatsapp-float:hover {
    background-color: #20BA5A;
    transform: scale(1.1) translateY(-5px);
    box-shadow: 0 8px 25px rgba(37, 211, 102, 0.4);
    color: #FFFFFF;
}

/* Pulse animation effect */
.whatsapp-float::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #25D366;
    opacity: 0.7;
    z-index: -1;
    animation: whatsapp-pulse 2s infinite;
}

@keyframes whatsapp-pulse {
    0% {
        transform: scale(1);
        opacity: 0.7;
    }
    100% {
        transform: scale(1.6);
        opacity: 0;
    }
}