/* ==========================================================================
   CSS VARIABLE SYSTEM (Modern & Industrial Layout)
   ========================================================================== */
:root {
    /* Paleta Industrial Basada en Acero y Seguridad */
    --primary-color: #0b3c5d;       /* Azul Industrial Profundo */
    --primary-hover: #07273e;
    --secondary-color: #d9b310;     /* Amarillo Oro / Seguridad Ocupacional */
    --secondary-hover: #bda010;
    --dark-steel: #1d2731;          /* Gris Acero Obscuro / Carbón */
    --light-bg: #f4f6f9;            /* Fondo Técnico Claro */
    --text-main: #333333;           /* Texto Principal Corp */
    --text-muted: #666666;
    --white: #ffffff;
    --border-color: #e2e8f0;
    --error-color: #e53e3e;
    
    /* Configuración de Transiciones */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --container-max: 1200px;
}

/* ==========================================================================
   RESET & SYSTEM BASICS
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    color: var(--text-main);
    line-height: 1.6;
}

body {
    background-color: var(--white);
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ==========================================================================
   TYPOGRAPHY & BUTTON COMPONENTS
   ========================================================================== */
h1, h2, h3, h4 {
    color: var(--dark-steel);
    font-weight: 700;
    line-height: 1.2;
}

h2 {
    font-size: 2rem;
    margin-bottom: 12px;
    position: relative;
    padding-bottom: 8px;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 4px;
    background-color: var(--secondary-color);
}

.section-header {
    margin-bottom: 48px;
    max-width: 700px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: 4px;
    border: 2px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition-smooth);
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--dark-steel);
}

.btn-secondary:hover {
    background-color: var(--secondary-hover);
}

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

.btn-outline:hover {
    background-color: var(--white);
    color: var(--primary-color);
}

.btn-block {
    width: 100%;
    display: flex;
}

/* ==========================================================================
   HEADER & NAVIGATION MANAGEMENT
   ========================================================================== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    transition: var(--transition-smooth);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    text-decoration: none;
    display: flex;
    flex-direction: column;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.logo-accent {
    color: var(--dark-steel);
}

.logo-sub {
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-top: -4px;
}

.main-nav ul {
    display: flex;
    list-style: none;
    align-items: center;
    gap: 28px;
}

.nav-link {
    text-decoration: none;
    color: var(--dark-steel);
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition-smooth);
}

.nav-link:hover, .nav-link.active {
    color: var(--primary-color);
}

.nav-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.hamburger {
    display: block;
    width: 24px;
    height: 3px;
    background-color: var(--dark-steel);
    position: relative;
    transition: var(--transition-smooth);
}

.hamburger::before, .hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 3px;
    background-color: var(--dark-steel);
    transition: var(--transition-smooth);
}

.hamburger::before { top: -8px; }
.hamburger::after { bottom: -8px; }

/* ==========================================================================
   HERO LAYER UI
   ========================================================================== */
.hero-section {
    background: linear-gradient(135deg, #0b3c5d 0%, #1d2731 100%);
    color: var(--white);
    padding: 100px 0 120px 0;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background-image: linear-gradient(rgba(11, 60, 93, 0.15) 2px, transparent 2px), linear-gradient(90deg, rgba(11, 60, 93, 0.15) 2px, transparent 2px);
    background-size: 30px 30px;
    opacity: 0.4;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: center;
}

.hero-content h1 {
    color: var(--white);
    font-size: 3rem;
    margin-bottom: 20px;
}

.hero-tag {
    display: inline-block;
    background-color: rgba(217, 179, 16, 0.2);
    border: 1px solid var(--secondary-color);
    color: var(--secondary-color);
    padding: 6px 14px;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    border-radius: 4px;
    margin-bottom: 16px;
}

.hero-content p {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 36px;
    max-width: 620px;
}

.hero-actions {
    display: flex;
    gap: 16px;
}

.blueprint-badge {
    background-color: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 32px;
    border-radius: 8px;
    backdrop-filter: blur(12px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.badge-title {
    display: block;
    color: var(--secondary-color);
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.9rem;
    margin-bottom: 12px;
}

/* ==========================================================================
   FEATURES SECTION
   ========================================================================== */
.features-section {
    padding: 80px 0;
    background-color: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    border: 1px solid var(--border-color);
    padding: 36px;
    border-radius: 6px;
    transition: var(--transition-smooth);
    background-color: var(--white);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.05);
    border-color: var(--primary-color);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-muted);
}

/* ==========================================================================
   PRODUCTS GRID & FILTER TABS
   ========================================================================== */
.products-section {
    padding: 80px 0;
    background-color: var(--light-bg);
}

.product-tabs {
    display: flex;
    gap: 12px;
    margin-bottom: 40px;
    overflow-x: auto;
    padding-bottom: 8px;
}

.tab-btn {
    background-color: var(--white);
    border: 1px solid var(--border-color);
    padding: 12px 24px;
    font-weight: 600;
    font-size: 0.9rem;
    border-radius: 4px;
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition-smooth);
}

.tab-btn:hover, .tab-btn.active {
    background-color: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.product-card {
    background-color: var(--white);
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: var(--transition-smooth);
}

.product-card:hover {
    box-shadow: 0 20px 30px rgba(0,0,0,0.06);
}

.product-image {
    height: 200px;
    background-color: #cbd5e1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    text-align: center;
    border-bottom: 4px solid var(--primary-color);
}

.image-placeholder {
    font-weight: 700;
    color: #475569;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.product-body {
    padding: 28px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.product-body h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
}

.product-body p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.product-body ul {
    list-style-position: inside;
    margin-bottom: 24px;
    color: var(--text-main);
    font-size: 0.9rem;
}

.product-body li {
    margin-bottom: 6px;
}

.card-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 700;
    margin-top: auto;
    font-size: 0.9rem;
    transition: var(--transition-smooth);
}

.card-link:hover {
    color: var(--secondary-color);
}

/* ==========================================================================
   ENGINEERING & VALUATION PROCESS
   ========================================================================== */
.engineering-section {
    padding: 100px 0;
    background-color: var(--dark-steel);
    color: var(--white);
}

.engineering-section h2 {
    color: var(--white);
}

.engineering-container {
    max-width: 900px;
}

.engineering-content > p {
    font-size: 1.15rem;
    margin-bottom: 40px;
    color: rgba(255,255,255,0.8);
}

.process-steps {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.step {
    display: flex;
    gap: 24px;
    align-items: flex-start;
}

.step-num {
    background-color: var(--secondary-color);
    color: var(--dark-steel);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.step h4 {
    color: var(--white);
    font-size: 1.25rem;
    margin-bottom: 6px;
}

.step p {
    color: rgba(255,255,255,0.75);
}

/* ==========================================================================
   APPLICATIONS SECTION
   ========================================================================== */
.applications-section {
    padding: 80px 0;
}

.apps-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.app-item {
    background-color: var(--light-bg);
    padding: 32px;
    border-radius: 4px;
    border-left: 5px solid var(--secondary-color);
}

.app-box h4 {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.app-box p {
    color: var(--text-muted);
}

/* ==========================================================================
   CONTACT WORKSPACE & FORM DESIGN
   ========================================================================== */
.contact-section {
    padding: 100px 0;
    background-color: var(--light-bg);
    border-top: 1px solid var(--border-color);
}

.contact-container {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 64px;
    align-items: start;
}

.contact-info h2 {
    margin-bottom: 20px;
}

.contact-info p {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 32px;
}

.info-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.info-item {
    display: flex;
    gap: 16px;
    align-items: center;
}

.info-item span {
    font-size: 1.5rem;
}

.contact-form-container {
    background-color: var(--white);
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.04);
}

.modern-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-row {
    display: flex;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    width: 100%;
}

.form-group label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--dark-steel);
}

.form-group input, .form-group textarea {
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.95rem;
    transition: var(--transition-smooth);
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(11, 60, 93, 0.1);
}

.form-group.invalid input, .form-group.invalid textarea {
    border-color: var(--error-color);
}

.error-msg {
    color: var(--error-color);
    font-size: 0.8rem;
    font-weight: 600;
    display: none;
}

.form-group.invalid .error-msg {
    display: block;
}

.form-success-alert {
    background-color: #f0fff4;
    border: 1px solid #c6f6d5;
    padding: 24px;
    border-radius: 6px;
    color: #22543d;
    text-align: center;
}

.form-success-alert h4 {
    color: #234e52;
    margin-bottom: 8px;
}

/* ==========================================================================
   FOOTER STRUCTURE
   ========================================================================== */
.site-footer {
    background-color: var(--dark-steel);
    color: rgba(255,255,255,0.7);
    padding: 60px 0 0 0;
    border-top: 4px solid var(--primary-color);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 0.5fr;
    gap: 48px;
    padding-bottom: 40px;
}

.footer-brand .logo-text {
    color: var(--white);
    margin-bottom: 12px;
    display: inline-block;
}

.footer-links h4 {
    color: var(--white);
    margin-bottom: 16px;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.footer-links ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    transition: var(--transition-smooth);
}

.footer-links a:hover {
    color: var(--secondary-color);
    padding-left: 4px;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding: 24px 0;
    font-size: 0.85rem;
}

.footer-bottom-container {
    display: flex;
    justify-content: space-between;
}

/* ==========================================================================
   MOBILE FIRST RESPONSIVE QUERIES
   ========================================================================== */
@media (max-width: 992px) {
    .hero-container, .contact-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .hero-badge-container {
        order: -1;
    }
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    h2 { font-size: 1.6rem; }
    .hero-content h1 { font-size: 2.2rem; }
    .features-grid, .apps-grid { grid-template-columns: 1fr; }
    .products-grid { grid-template-columns: 1fr; }
    .form-row { flex-direction: column; gap: 20px; }
    .footer-bottom-container { flex-direction: column; gap: 12px; }
    
    /* Menú Móvil Arquitectura */
    .nav-toggle { display: block; }
    .main-nav {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--white);
        border-bottom: 1px solid var(--border-color);
        padding: 24px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
        display: none;
    }
    .main-nav.open { display: block; }
    .main-nav ul { flex-direction: column; align-items: stretch; gap: 16px; }
    .nav-btn { text-align: center; }
}