/* ==========================================================================
   RESET & VARIABLES GLOBALES (CSS Custom Properties)
   ========================================================================== */
:root {
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Open Sans', sans-serif;

    /* Paleta Corporativa Pedernal */
    --color-primary: #122338;       /* Azul Petróleo / Pizarra Minero */
    --color-primary-light: #1e3a5f;
    --color-accent: #d97706;        /* Tono Ocre / Cantera dorado */
    --color-accent-hover: #b45309;
    --color-dark: #0b131f;
    --color-gray-dark: #334155;
    --color-gray-light: #f8fafc;
    --color-gray-border: #e2e8f0;
    --color-white: #ffffff;
    --color-success: #15803d;
    --color-danger: #b91c1c;

    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 6px 18px rgba(0,0,0,0.08);
    --shadow-lg: 0 15px 30px rgba(0,0,0,0.12);
    --radius: 6px;
    --max-width: 1200px;
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    color: var(--color-gray-dark);
    line-height: 1.65;
    background-color: var(--color-white);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--color-primary);
    font-weight: 700;
    line-height: 1.25;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ==========================================================================
   LAYOUT Y UTILIDADES
   ========================================================================== */
.container {
    width: 90%;
    max-width: var(--max-width);
    margin-left: auto;
    margin-right: auto;
}

.section-padding {
    padding: 5.5rem 0;
}

.bg-light {
    background-color: var(--color-gray-light);
}

.bg-dark {
    background-color: var(--color-dark);
}

.text-white {
    color: var(--color-white) !important;
}

.text-muted {
    color: #94a3b8 !important;
}

.text-center {
    text-align: center;
}

.items-center {
    align-items: center;
}

.grid {
    display: grid;
    gap: 2rem;
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* Iconos SVG inline */
.icon {
    width: 15px;
    height: 15px;
    fill: currentColor;
    vertical-align: middle;
    margin-right: 5px;
}

/* ==========================================================================
   BOTONES Y COMPONENTES UI
   ========================================================================== */
.btn {
    display: inline-block;
    padding: 0.85rem 1.8rem;
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    border-radius: var(--radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(217, 119, 6, 0.3);
}

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

.btn-outline:hover {
    background-color: var(--color-white);
    color: var(--color-primary);
    transform: translateY(-2px);
}

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

.section-header {
    margin-bottom: 3rem;
}

.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--color-accent);
    letter-spacing: 1.5px;
    margin-bottom: 0.5rem;
}

.section-tag-gold {
    color: #fbbf24;
}

.section-title {
    font-size: 2.2rem;
    margin-bottom: 0.8rem;
}

.section-sub {
    font-size: 1.1rem;
    color: #64748b;
    max-width: 650px;
    margin: 0 auto;
}

/* ==========================================================================
   HEADER & NAVBAR
   ========================================================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: var(--transition);
}

.site-header.scrolled {
    background-color: rgba(213, 213, 213, 0.98);
    backdrop-filter: blur(8px);
    box-shadow: var(--shadow-md);
}

.top-bar {
    background-color: var(--color-dark);
    color: #94a3b8;
    font-size: 0.8rem;
    padding: 0.4rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.top-bar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.contact-quick span {
    margin-right: 20px;
}

.badge-tag {
    background-color: rgba(255, 255, 255, 0.1);
    color: #cbd5e1;
    padding: 2px 8px;
    border-radius: 4px;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 0;
    transition: var(--transition);
}

.site-header.scrolled .navbar {
    padding: 0.8rem 0;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-mark {
    width: 180px;
    height: auto;
    color: var(--color-white);
    font-weight: 800;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
    color: var(--color-white);
}

.logo-text strong {
    font-size: 1.25rem;
    letter-spacing: 1.5px;
}

.logo-text span {
    font-size: 0.65rem;
    letter-spacing: 3px;
    color: var(--color-accent);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    color: #e2e8f0;
    font-size: 0.95rem;
    font-weight: 600;
    position: relative;
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background-color: var(--color-accent);
    transition: var(--transition);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

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

.menu-toggle .bar {
    width: 26px;
    height: 3px;
    background-color: var(--color-white);
    border-radius: 2px;
    transition: var(--transition);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #111e2e radial-gradient(circle at center, #1b324d 0%, #0d1724 100%);
    color: var(--color-white);
    padding: 8rem 0 4rem;
    
}

.hero-overlay {
    position: absolute;
    width: 100vw; height: 100%; overflow: hidden;
    inset: 0;
    opacity: 0.6;
}

.hero-overlay img {
    width: 100%; height: 100%;
    object-fit:fill;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 850px;
}

.hero-badge {
    background: rgba(217, 119, 6, 0.2);
    border: 1px solid var(--color-accent);
    color: #fde68a;
    padding: 0.4rem 1rem;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    border-radius: 50px;
    display: inline-block;
    margin-bottom: 1.5rem;
}

.hero-title {
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    color: var(--color-white);
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: 1.15rem;
    color: #cbd5e1;
    margin-bottom: 2.5rem;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 25px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    animation: bounce 2s infinite;
}

.hero-scroll-indicator svg {
    width: 32px;
    height: 32px;
    fill: var(--color-white);
    opacity: 0.7;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0) translateX(-50%); }
    40% { transform: translateY(-10px) translateX(-50%); }
    60% { transform: translateY(-5px) translateX(-50%); }
}

/* ==========================================================================
   NOSOTROS
   ========================================================================== */
.lead-text {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.image-box {
    position: relative;
    background-color: #e2e8f0;
    border-radius: var(--radius);
    height: 380px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Gráfico abstracto representativo de estratos mineros */
.mineral-graphic {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.mineral-graphic .layer {
    flex: 1;
    transition: var(--transition);
}

.mineral-graphic .layer-1 { background-color: #475569; }
.mineral-graphic .layer-2 { background-color: #64748b; }
.mineral-graphic .layer-3 { background-color: #94a3b8; }

.exp-badge {
    position: absolute;
    bottom: 25px;
    right: 25px;
    background: var(--color-primary);
    color: var(--color-white);
    padding: 1.5rem;
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow-lg);
    border-left: 5px solid var(--color-accent);
}

.exp-number {
    font-size: 2.5rem;
    font-weight: 800;
    display: block;
    line-height: 1;
    color: #fbbf24;
}

.exp-txt {
    font-size: 0.75rem;
    text-transform: uppercase;
    font-weight: 600;
}

.features-list {
    margin-top: 2rem;
}

.feature-item {
    display: flex;
    gap: 15px;
    margin-bottom: 1.5rem;
}

.feature-icon {
    width: 38px;
    height: 38px;
    background: rgba(217, 119, 6, 0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.feature-icon svg {
    width: 20px;
    height: 20px;
    fill: var(--color-accent);
}

/* ==========================================================================
   KPI BANNER
   ========================================================================== */
.kpi-banner {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: 3.5rem 0;
    border-top: 4px solid var(--color-accent);
}

.kpi-number {
    font-size: 2.8rem;
    font-weight: 800;
    color: #fbbf24;
    margin-bottom: 0.3rem;
    font-family: var(--font-heading);
}

.kpi-label {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #cbd5e1;
}

/* ==========================================================================
   PRODUCTOS
   ========================================================================== */
.filter-controls {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 3rem;
}

.filter-btn {
    background: none;
    border: 1px solid var(--color-gray-border);
    padding: 0.6rem 1.4rem;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 30px;
    color: var(--color-gray-dark);
    transition: var(--transition);
}

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

.card {
    background: var(--color-white);
    border-radius: var(--radius);
    border: 1px solid var(--color-gray-border);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.product-badge {
    background: var(--color-primary-light);
    color: #fbbf24;
    padding: 0.4rem 1rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.card-body {
    padding: 1.8rem;
    flex-grow: 1;
}

.card-body h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.product-spec {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--color-accent);
    margin-bottom: 1rem;
}

.spec-list {
    margin-top: 1.2rem;
    padding-top: 1.2rem;
    border-top: 1px dashed var(--color-gray-border);
    font-size: 0.85rem;
}

.spec-list li {
    margin-bottom: 0.4rem;
}

.card-footer {
    padding: 1rem 1.8rem;
    background: #f8fafc;
    border-top: 1px solid var(--color-gray-border);
}

.btn-card {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-primary);
}

.btn-card:hover {
    color: var(--color-accent);
}

/* ==========================================================================
   PROCESO Y SUSTENTABILIDAD
   ========================================================================== */
.step-card {
    background-color: rgba(255, 255, 255, 0.04);
    padding: 2.2rem;
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, 0.08);
    position: relative;
}

.step-number {
    font-size: 3rem;
    font-weight: 800;
    color: rgba(217, 119, 6, 0.4);
    line-height: 1;
    margin-bottom: 1rem;
}

.step-card h3 {
    color: var(--color-white);
    margin-bottom: 0.8rem;
    font-size: 1.25rem;
}

.step-card p {
    color: #94a3b8;
    font-size: 0.95rem;
}

/* ==========================================================================
   CONTACTO
   ========================================================================== */
.info-blocks {
    margin-top: 2rem;
}

.info-block {
    display: flex;
    gap: 15px;
    margin-bottom: 1.5rem;
}

.info-icon {
    width: 44px;
    height: 44px;
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.info-icon svg {
    width: 22px;
    height: 22px;
    fill: var(--color-accent);
}

.contact-form-card {
    background: var(--color-white);
    padding: 2.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-gray-border);
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-row {
    gap: 1rem;
}

label {
    display: block;
    font-weight: 600;
    font-size: 0.85rem;
    margin-bottom: 0.4rem;
    color: var(--color-primary);
}

.form-control {
    width: 100%;
    padding: 0.75rem 0.9rem;
    font-family: inherit;
    font-size: 0.95rem;
    border: 1px solid var(--color-gray-border);
    border-radius: var(--radius);
    background-color: #fdfdfd;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.15);
}

.form-feedback {
    padding: 1rem;
    border-radius: var(--radius);
    margin-bottom: 1.2rem;
    display: none;
    font-size: 0.9rem;
}

.form-feedback.success {
    display: block;
    background-color: #dcfce7;
    color: var(--color-success);
    border: 1px solid #bbf7d0;
}

.form-feedback.error {
    display: block;
    background-color: #fee2e2;
    color: var(--color-danger);
    border: 1px solid #fecaca;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
    background-color: #070d14;
    color: #94a3b8;
    padding: 4rem 0 0;
    font-size: 0.9rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    padding-bottom: 3.5rem;
}

.footer-brand .brand-logo {
    margin-bottom: 1rem;
}

.footer-links h4 {
    color: var(--color-white);
    font-size: 1.05rem;
    margin-bottom: 1.2rem;
}

.footer-links ul li {
    margin-bottom: 0.6rem;
}

.footer-links a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 1.5rem 0;
    font-size: 0.8rem;
}

.footer-bottom-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* ==========================================================================
   RESPONSIVE DESIGN (MEDIA QUERIES)
   ========================================================================== */
@media (max-width: 992px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }

    .top-bar {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background-color: var(--color-primary);
        flex-direction: column;
        justify-content: flex-start;
        padding: 5rem 2rem;
        box-shadow: -5px 0 20px rgba(0,0,0,0.3);
        transition: var(--transition);
    }

    .nav-menu.open {
        right: 0;
    }

    .nav-links {
        flex-direction: column;
        width: 100%;
        gap: 1.2rem;
    }

    .nav-cta {
        width: 100%;
        margin-top: 1.5rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-bottom-inner {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }
}