/* ARQUITECTURA VISUAL INDUSTRIAL - MURCIEGALO GROUP SLU */
:root {
    --obsidian: #111416;
    --concrete: #F4F5F6;
    --tech-yellow: #FFC300;
    --tech-yellow-dark: #E0AB00;
    --dark-slate: #212529;
    --border-gray: #DDE1E5;
    --text-dark: #1A1D20;
    --text-muted: #5A626A;
    --sidebar-width: 280px;
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    --transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-body); background-color: var(--concrete); color: var(--text-dark); line-height: 1.8; overflow-x: hidden; padding-left: var(--sidebar-width); }

/* BARRA DE PROGRESO DE LECTURA (JS) */
.progress-bar-container {
    position: fixed; top: 0; left: var(--sidebar-width); right: 0; height: 5px;
    background: rgba(0,0,0,0.05); z-index: 2000;
}
.progress-line { height: 100%; background: var(--tech-yellow); width: 0%; transition: width 0.1s ease-out; }

/* MENÚ LATERAL FIJO EXCLUSIVO (DESKTOP) */
aside.sidebar-nav {
    position: fixed; top: 0; left: 0; width: var(--sidebar-width); height: 100vh;
    background: var(--obsidian); border-right: 1px solid rgba(255,255,255,0.05);
    padding: 40px 30px; display: flex; flex-direction: column; justify-content: space-between; z-index: 1500;
}
.brand-box { text-decoration: none; display: flex; flex-direction: column; }
.brand-title { font-family: var(--font-heading); font-size: 1.6rem; font-weight: 900; color: white; letter-spacing: -0.5px; text-transform: uppercase; }
.brand-title span { color: var(--tech-yellow); }
.brand-subtitle { font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 3px; margin-top: 5px; font-weight: 700; }

.main-menu { list-style: none; margin-top: 50px; display: flex; flex-direction: column; gap: 15px; }
.main-menu a {
    color: #A0AAB5; text-decoration: none; font-size: 0.9rem; font-weight: 700;
    text-transform: uppercase; letter-spacing: 1px; display: block; padding: 12px 20px;
    border-radius: 4px; transition: var(--transition); border-left: 3px solid transparent;
}
.main-menu a:hover, .main-menu a.active {
    color: white; background: rgba(255,255,255,0.03); border-left-color: var(--tech-yellow);
}

.sidebar-footer { font-size: 0.75rem; color: var(--text-muted); }
.lang-select-box { background: transparent; border: 1px solid rgba(255,255,255,0.1); color: white; padding: 8px; width: 100%; font-weight: 700; cursor: pointer; outline: none; margin-top: 15px; }
.lang-select-box option { background: var(--obsidian); color: white; }

/* REVESTIMIENTO HERO EN LA CONFIGURACIÓN DE PÁGINA */
.hero-giant {
    position: relative; height: 100vh; background: var(--obsidian);
    display: flex; align-items: center; padding: 0 8%; overflow: hidden;
}
.hero-video-bg {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%; object-fit: cover;
    opacity: 0.4; filter: grayscale(40%); z-index: 0;
}
.hero-overlay-dark { position: absolute; inset: 0; background: linear-gradient(to right, rgba(17,20,22,0.9) 30%, transparent 100%); z-index: 1; }
.hero-inner { position: relative; z-index: 2; max-width: 850px; color: white; }
.hero-inner h1 { font-family: var(--font-heading); font-size: 5rem; font-weight: 900; text-transform: uppercase; line-height: 1.1; margin-bottom: 25px; }
.hero-inner h1 span { color: var(--tech-yellow); }
.hero-inner p { font-size: 1.3rem; opacity: 0.85; margin-bottom: 40px; font-weight: 300; max-width: 650px; }

.btn-tech {
    display: inline-block; background: var(--tech-yellow); color: var(--obsidian);
    padding: 20px 45px; font-size: 0.95rem; font-weight: 800; text-transform: uppercase;
    letter-spacing: 2px; text-decoration: none; border-radius: 2px; transition: var(--transition);
    box-shadow: 0 10px 30px rgba(255, 195, 0, 0.2); border: none;
}
.btn-tech:hover { background: white; color: var(--obsidian); transform: translateY(-3px); }

/* SECCIONES Y CONTENIDOS MASIVOS */
section.main-section { padding: 120px 8%; max-width: 1500px; }
.section-headline { font-family: var(--font-heading); font-size: 3.5rem; font-weight: 900; text-transform: uppercase; color: var(--obsidian); margin-bottom: 50px; }
.section-headline span { color: var(--tech-yellow-dark); }

.massive-card { background: white; padding: 65px; border-radius: 4px; box-shadow: 0 20px 50px rgba(0,0,0,0.02); border-left: 6px solid var(--obsidian); margin-bottom: 50px; }
.massive-card h3 { font-size: 2rem; margin-bottom: 25px; font-family: var(--font-heading); }
.massive-card p { font-size: 1.15rem; color: var(--text-muted); margin-bottom: 25px; text-align: justify; }

/* FILTRO DE PORTAFOLIO INTERACTIVO (JS) */
.filter-tabs { display: flex; gap: 15px; margin-bottom: 40px; flex-wrap: wrap; }
.filter-btn { background: white; border: 1px solid var(--border-gray); padding: 12px 25px; font-weight: 700; text-transform: uppercase; font-size: 0.8rem; letter-spacing: 1px; cursor: pointer; transition: var(--transition); }
.filter-btn.active, .filter-btn:hover { background: var(--obsidian); color: white; border-color: var(--obsidian); }
.portfolio-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 25px; }
.portfolio-item { background: white; border-radius: 4px; overflow: hidden; box-shadow: 0 5px 15px rgba(0,0,0,0.02); transition: var(--transition); }
.portfolio-item img { width: 100%; height: 250px; object-fit: cover; }
.portfolio-item-body { padding: 25px; }
.portfolio-item.hidden { display: none; }

/* SERVICIOS: REGLA ESTRICTA (SÓLO TÍTULO, SIN DESCRIPCIÓN) */
.services-industrial-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
.service-construction-card {
    background: var(--obsidian); height: 280px; padding: 40px; display: flex;
    align-items: flex-end; justify-content: flex-start; position: relative; overflow: hidden;
    border-bottom: 4px solid var(--tech-yellow);
}
.service-construction-card::before {
    content: ''; position: absolute; inset: 0;
    background: url('https://images.unsplash.com/photo-1541888946425-d81bb19240f5?q=80&w=600&auto=format&fit=crop') center/cover no-repeat;
    opacity: 0.15; transition: var(--transition);
}
.service-construction-card:hover::before { transform: scale(1.05); opacity: 0.3; }
.service-construction-card h3 {
    position: relative; z-index: 5; color: white; font-size: 1.8rem;
    font-family: var(--font-heading); text-transform: uppercase; font-weight: 800; margin: 0;
}
.service-construction-card p { display: none !important; }

/* TESTIMONIOS (REGLA: 100% ANÓNIMOS) */
.reviews-masonry-box { display: grid; grid-template-columns: repeat(2, 1fr); gap: 35px; }
.anonymous-review-card { background: white; padding: 50px; border-radius: 2px; border-top: 4px solid var(--tech-yellow); position: relative; }
.anonymous-review-card p { font-size: 1.2rem; font-style: italic; color: var(--dark-slate); margin: 0; }

/* FAQ: REGLA ESTRICTA (EXACTAMENTE 2, H3 + P) */
.faq-block-wrap { max-width: 950px; }
.faq-structural-item { background: white; padding: 45px; margin-bottom: 25px; border-left: 5px solid var(--tech-yellow); }
.faq-structural-item h3 { font-size: 1.5rem; color: var(--obsidian); margin-bottom: 15px; font-family: var(--font-heading); }
.faq-structural-item p { font-size: 1.15rem; color: var(--text-muted); margin: 0; }

/* CONTACTO */
.grid-form-layout { display: grid; grid-template-columns: 1fr 1.2fr; gap: 50px; }
.info-panel-dark { background: var(--obsidian); color: white; padding: 55px; border-radius: 4px; }
.info-panel-dark h3 { color: var(--tech-yellow); font-size: 2rem; margin-bottom: 25px; text-transform: uppercase; }
.info-panel-dark p { opacity: 0.8; margin-bottom: 20px; font-size: 1.1rem; }
.info-panel-dark strong { display: block; color: var(--tech-yellow); text-transform: uppercase; font-size: 0.85rem; letter-spacing: 1px; margin-top: 25px; margin-bottom: 5px; }

.form-box-concrete { background: white; padding: 55px; border-radius: 4px; box-shadow: 0 10px 30px rgba(0,0,0,0.02); }
.input-tech { width: 100%; padding: 18px; background: var(--concrete); border: 1px solid var(--border-gray); font-size: 1.05rem; margin-bottom: 20px; font-family: var(--font-body); outline: none; }
.input-tech:focus { border-color: var(--tech-yellow); background: white; }

/* PÁGINAS LEGALES */
.legal-container-box { background: white; padding: 75px; border-radius: 4px; box-shadow: 0 10px 40px rgba(0,0,0,0.02); }
.legal-container-box h1 { font-family: var(--font-heading); font-size: 3rem; color: var(--obsidian); margin-bottom: 40px; text-transform: uppercase; border-bottom: 2px solid var(--concrete); padding-bottom: 20px; }
.legal-container-box h2 { font-size: 1.6rem; color: var(--tech-yellow-dark); margin: 45px 0 20px; font-family: var(--font-heading); text-transform: uppercase; }
.legal-container-box p, .legal-container-box li { font-size: 1.1rem; color: var(--text-muted); margin-bottom: 20px; text-align: justify; }
.legal-container-box ul { padding-left: 30px; margin-bottom: 25px; }

/* FOOTER GLOBAL CON REGLA LOGO_KIT */
footer.global-footer { background: var(--obsidian); color: white; padding: 80px 8% 40px; border-top: 5px solid var(--tech-yellow); }
.footer-main-columns { display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 40px; margin-bottom: 60px; text-align: left; }
.footer-main-columns h4 { color: var(--tech-yellow); font-family: var(--font-heading); font-size: 1.1rem; margin-bottom: 25px; text-transform: uppercase; letter-spacing: 1px; }
.footer-ul-links { list-style: none; }
.footer-ul-links li { margin-bottom: 12px; }
.footer-ul-links a { color: #A0AAB5; text-decoration: none; font-size: 0.95rem; transition: var(--transition); }
.footer-ul-links a:hover { color: white; padding-left: 5px; }

/* REGLA INQUEBRANTABLE: CENTRADO, HEIGHT 125PX, FONDO TRANSPARENTE */
.kit-digital-logo-centered {
    height: 125px !important;
    background-color: transparent !important;
    display: block;
    margin: 40px auto 20px;
}

/* RESPONSIVE FLUIDO (MOBILE-FIRST FLIP) */
@media (max-width: 1024px) {
    body { padding-left: 0; padding-top: 80px; }
    aside.sidebar-nav {
        position: fixed; top: 0; left: 0; width: 100%; height: 80px;
        flex-direction: row; align-items: center; justify-content: space-between;
        padding: 0 5%; border-right: none; border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .main-menu { display: none; } /* En producción se activa el menú burger */
    .progress-bar-container { left: 0; top: 80px; }
    .hero-giant { height: calc(100vh - 80px); }
    .hero-inner h1 { font-size: 3.2rem; }
    .portfolio-grid, .services-industrial-grid, .reviews-masonry-box, .grid-form-layout { grid-template-columns: 1fr; }
    .footer-main-columns { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
    .hero-inner h1 { font-size: 2.5rem; }
    .section-headline { font-size: 2.3rem; }
    .massive-card, .form-box-concrete, .info-panel-dark, .legal-container-box { padding: 30px 20px; }
    .footer-main-columns { grid-template-columns: 1fr; }
}