/* ==========================================================================
   DESIGN SYSTEM & VARIABLES - Metalúrgica Industrial B2B
   ========================================================================== */
:root {
    /* Colors */
    --color-slate: #2D3748;
    /* Gris acero (Backgrounds, headers) */
    --color-orange: #F97316;
    /* Naranja operativo (CTAs, Accents) */
    --color-white: #FFFFFF;
    /* Blanco */
    --color-black: #1A202C;
    /* Negro técnico (Text, borders) */
    --color-gray-light: #F3F4F6;
    /* Gris muy claro para secciones secundarias */
    --color-border: #E5E7EB;

    /* Typography */
    /* Roboto for a very technical, clean, structured look */
    --font-primary: 'Roboto', sans-serif;

    /* Spacing */
    --spacing-section: 80px;
    --spacing-element: 24px;

    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.25s ease-in-out;

    /* Box Shadows (Harsh/Technical, not soft) */
    --shadow-base: 0 4px 0 rgba(26, 32, 44, 1);
    /* Hard shadow typical of industrial UI */
    --shadow-hover: 0 6px 0 rgba(26, 32, 44, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-black);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-primary);
    font-weight: 900;
    color: var(--color-black);
    text-transform: uppercase;
    line-height: 1.2;
    letter-spacing: -0.5px;
    margin-bottom: 1rem;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 1.5rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: 1.25rem;
    color: #4B5563;
    /* Gray text for readability against white */
}

a {
    text-decoration: none;
    color: var(--color-orange);
    font-weight: 700;
    transition: color var(--transition-fast);
}

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

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

.section-padding {
    padding: var(--spacing-section) 0;
}

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

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

.bg-dark h2,
.bg-dark h3,
.bg-dark h4 {
    color: var(--color-white);
}

.bg-dark p {
    color: #9CA3AF;
}

.section-header {
    text-align: left;
    margin-bottom: 3rem;
    border-left: 6px solid var(--color-orange);
    padding-left: 20px;
}

.section-header p {
    font-size: 1.125rem;
    font-weight: 500;
    margin-bottom: 0;
    max-width: 800px;
}

/* ==========================================================================
   BUTTONS (Industrial blocky style)
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 0;
    /* Square corners for industrial feel */
    font-weight: 700;
    font-family: var(--font-primary);
    font-size: 1rem;
    text-transform: uppercase;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
    text-align: center;
}

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

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--color-black);
    color: var(--color-white);
}

/* High Conversion CTA - Orange */
.btn-cta {
    background-color: var(--color-orange);
    color: var(--color-black);
    border: 2px solid var(--color-black);
    box-shadow: var(--shadow-base);
}

.btn-cta:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    color: var(--color-black);
}

.btn-cta:active {
    transform: translateY(2px);
    box-shadow: 0 0 0 rgba(26, 32, 44, 1);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-white);
    border: 2px solid var(--color-white);
}

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

.bg-light .btn-outline,
.capacities .btn-outline {
    color: var(--color-black);
    border-color: var(--color-black);
}

.bg-light .btn-outline:hover,
.capacities .btn-outline:hover {
    background-color: var(--color-black);
    color: var(--color-white);
}

.btn-large {
    padding: 18px 36px;
    font-size: 1.125rem;
}

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

/* ==========================================================================
   HEADER / NAVBAR
   ========================================================================== */
.navbar {
    background-color: var(--color-black);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 4px solid var(--color-orange);
}

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

.brand-logo {
    font-family: var(--font-primary);
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--color-white);
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: 1px;
}

.brand-logo i {
    color: var(--color-orange);
}

.brand-logo:hover {
    color: var(--color-white);
}

.nav-links {
    display: none;
}

.nav-links a {
    color: #D1D5DB;
    font-weight: 700;
    font-size: 0.95rem;
    margin: 0 16px;
    text-transform: uppercase;
}

.nav-links a:hover {
    color: var(--color-orange);
}

.header-actions {
    display: none;
}

.nav-phone {
    color: var(--color-white);
    font-weight: 700;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 8px;
    margin-right: 24px;
}

.nav-phone:hover {
    color: var(--color-orange);
}

@media (min-width: 1024px) {
    .nav-links {
        display: flex;
        align-items: center;
    }

    .header-actions {
        display: flex;
        align-items: center;
    }
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero {
    position: relative;
    padding: 100px 0 140px;
    color: var(--color-white);
    display: flex;
    align-items: center;
    background-color: var(--color-black);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* Dark industrial overlay matching exact plant colors */
    background: linear-gradient(rgba(26, 32, 44, 0.7), rgba(26, 32, 44, 0.9)),
        url('https://images.unsplash.com/photo-1565514020179-026b92b84bb6?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80') center/cover;
    z-index: 0;
}

.hero-container {
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 900px;
}

.hero-badge {
    display: inline-block;
    background-color: var(--color-orange);
    color: var(--color-black);
    padding: 4px 12px;
    font-weight: 900;
    font-size: 0.875rem;
    letter-spacing: 2px;
    margin-bottom: 24px;
}

.hero h1 {
    color: var(--color-white);
    margin-bottom: 24px;
    text-transform: uppercase;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 40px;
    color: #D1D5DB;
    font-weight: 500;
    max-width: 700px;
}

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

/* ==========================================================================
   METRICS BAR
   ========================================================================== */
.metrics {
    border-top: 4px solid var(--color-orange);
    padding: 40px 0;
    position: relative;
    z-index: 2;
    margin-top: -40px;
}

.metrics-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
    text-align: center;
}

@media (min-width: 640px) {
    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .metrics-grid {
        grid-template-columns: repeat(4, 1fr);
        text-align: left;
    }
}

.metric-item {
    display: flex;
    flex-direction: column;
    padding-left: 20px;
    border-left: 2px solid var(--color-slate);
}

@media (max-width: 1023px) {
    .metric-item {
        border-left: none;
        padding-left: 0;
        border-bottom: 1px solid var(--color-slate);
        padding-bottom: 20px;
    }
}

.metric-number {
    font-size: 3rem;
    font-weight: 900;
    color: var(--color-orange);
    line-height: 1;
}

.metric-unit {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--color-white);
    margin-left: 4px;
}

.metric-label {
    font-size: 0.875rem;
    color: #9CA3AF;
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 1px;
    margin-top: 8px;
}

/* ==========================================================================
   CAPACITIES & PROCESSES
   ========================================================================== */
.process-flow {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 60px;
}

@media (min-width: 768px) {
    .process-flow {
        flex-direction: row;
        align-items: stretch;
    }
}

.flow-step {
    flex: 1;
    background-color: var(--color-gray-light);
    border: 2px solid var(--color-black);
    padding: 24px;
    position: relative;
}

/* Industrial corner cut effect using clip-path mapping */
.flow-step::before {
    content: '';
    position: absolute;
    top: -2px;
    right: -2px;
    width: 20px;
    height: 20px;
    background-color: var(--color-orange);
}

.flow-icon {
    font-size: 2.5rem;
    color: var(--color-orange);
    margin-bottom: 16px;
}

.flow-step h4 {
    margin-bottom: 8px;
}

.flow-detail {
    font-weight: 500;
    color: #4B5563;
    font-size: 0.875rem;
}

.flow-connector {
    display: none;
}

@media (min-width: 768px) {
    .flow-connector {
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 2rem;
        color: var(--color-slate);
    }
}

.specs-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
}

@media (min-width: 992px) {
    .specs-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.spec-card {
    border: 2px solid var(--color-border);
    padding: 32px;
    background-color: var(--color-white);
}

.spec-card h3 {
    border-bottom: 2px solid var(--color-black);
    padding-bottom: 16px;
    margin-bottom: 24px;
}

.spec-list {
    list-style: none;
}

.spec-list li {
    padding: 12px 0;
    border-bottom: 1px solid var(--color-gray-light);
    color: var(--color-black);
}

.spec-list li:last-child {
    border-bottom: none;
}

.spec-list strong {
    color: var(--color-slate);
    margin-right: 8px;
}

/* ==========================================================================
   CERTIFICATIONS
   ========================================================================== */
.compliance-wrapper {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
}

@media (min-width: 992px) {
    .compliance-wrapper {
        grid-template-columns: 1fr 2fr;
    }
}

.cert-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

@media (min-width: 640px) {
    .cert-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.cert-card {
    background-color: var(--color-white);
    border: 2px solid var(--color-black);
    padding: 24px;
    text-align: center;
}

.cert-logo {
    display: inline-block;
    background-color: var(--color-black);
    color: var(--color-white);
    font-weight: 900;
    font-size: 1.5rem;
    padding: 12px;
    margin-bottom: 16px;
}

.cert-card h4 {
    margin-bottom: 12px;
    font-size: 1rem;
}

.cert-date {
    font-weight: 700;
    color: var(--color-orange);
    font-size: 0.875rem;
    margin-bottom: 4px;
}

.cert-org {
    font-size: 0.75rem;
    color: #6B7280;
    text-transform: uppercase;
}

/* ==========================================================================
   PORTFOLIO (Filtering)
   ========================================================================== */
.portfolio-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 40px;
}

.filter-btn {
    background: transparent;
    border: 2px solid var(--color-border);
    padding: 8px 16px;
    font-family: var(--font-primary);
    font-weight: 700;
    text-transform: uppercase;
    cursor: pointer;
    color: var(--color-black);
    transition: all var(--transition-fast);
}

.filter-btn:hover {
    border-color: var(--color-black);
}

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

.portfolio-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
}

@media (min-width: 768px) {
    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .portfolio-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.project-card {
    border: 2px solid var(--color-border);
    transition: all var(--transition-normal);
}

.project-card:hover {
    border-color: var(--color-black);
    box-shadow: var(--shadow-base);
}

.project-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-bottom: 2px solid var(--color-border);
}

.project-card:hover .project-img {
    filter: brightness(0.9);
}

.project-content {
    padding: 24px;
}

.project-tag {
    display: inline-block;
    background-color: var(--color-orange);
    color: var(--color-black);
    font-size: 0.75rem;
    font-weight: 900;
    padding: 4px 8px;
    margin-bottom: 12px;
    text-transform: uppercase;
}

.project-content h3 {
    font-size: 1.25rem;
    margin-bottom: 16px;
    min-height: 56px;
}

.project-details p {
    font-size: 0.875rem;
    margin-bottom: 12px;
    color: var(--color-black);
}

.project-details strong {
    color: var(--color-slate);
}

.project-result {
    background-color: var(--color-gray-light);
    padding: 12px;
    border-left: 4px solid var(--color-orange);
    margin-top: 16px;
    margin-bottom: 0 !important;
}

.project-card.hide {
    display: none;
}

/* ==========================================================================
   B2B FORM
   ========================================================================== */
.quote-wrapper {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
}

@media (min-width: 992px) {
    .quote-wrapper {
        grid-template-columns: 1fr 2fr;
    }
}

.contact-direct {
    margin-top: 32px;
    padding-top: 32px;
    border-top: 1px solid var(--color-slate);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    font-weight: 700;
}

.contact-item i {
    color: var(--color-orange);
    font-size: 1.5rem;
}

.quote-form-card {
    background-color: var(--color-white);
    padding: 40px;
    border: 4px solid var(--color-gray-light);
}

.form-group {
    margin-bottom: 24px;
}

.form-row {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.form-group.half {
    flex: 1;
    min-width: 250px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 700;
    color: var(--color-black);
    text-transform: uppercase;
    font-size: 0.875rem;
}

input,
select {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--color-border);
    font-family: var(--font-primary);
    font-size: 1rem;
    color: var(--color-black);
    background-color: var(--color-white);
    transition: all var(--transition-fast);
    border-radius: 0;
    /* Industrial rigid blocks */
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--color-black);
}

/* Custom File Upload */
.file-upload-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: 16px;
}

.file-input {
    position: absolute;
    left: 0;
    top: 0;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
    z-index: 2;
}

.file-custom-button {
    background-color: var(--color-slate);
    color: var(--color-white);
    padding: 12px 20px;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    z-index: 1;
}

.file-name {
    font-size: 0.875rem;
    color: #6B7280;
    z-index: 1;
}

.form-message {
    margin-top: 16px;
    padding: 16px;
    display: none;
    font-weight: 700;
    border: 2px solid;
}

.form-message.success {
    display: block;
    background-color: var(--color-gray-light);
    color: var(--color-black);
    border-color: var(--color-black);
    border-left: 8px solid var(--color-orange);
}

.form-message.error {
    display: block;
    background-color: #FEF2F2;
    color: #B91C1C;
    border-color: #B91C1C;
}

.form-note {
    font-size: 0.8rem;
    color: #6B7280;
    margin-top: 16px;
    text-align: center;
    font-weight: 500;
}

/* ==========================================================================
   FOOTER (Industrial Style)
   ========================================================================== */
.site-footer {
    background-color: #111827;
    /* Extra dark */
    color: #9CA3AF;
    padding: 60px 0 24px 0;
    border-top: 4px solid var(--color-orange);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: minmax(auto, 300px) auto auto;
    }
}

.footer-logo {
    margin-bottom: 16px;
}

.site-footer h4 {
    color: var(--color-white);
    margin-bottom: 20px;
}

.links-col {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.links-col a,
.legal-links a {
    color: #9CA3AF;
    font-weight: 500;
}

.links-col a:hover,
.legal-links a:hover {
    color: var(--color-orange);
}

.facility-col p {
    color: #9CA3AF;
}

.facility-col strong {
    color: var(--color-white);
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

@media (min-width: 768px) {
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

.legal-links {
    display: flex;
    gap: 20px;
}