/* 
   Puerta Díaz Engineering - Main Stylesheet
   Style: Swiss / International Typographic Style / Modern Industrial
   Theme: Dark Engineering Blue
*/

:root {
    /* Colors - Dark Blue / Engineering Theme */
    --color-bg: #0F172A;
    /* Slate 900 - Main Background */
    --color-bg-light: #1E293B;
    /* Slate 800 - Secondary/Cards */
    --color-bg-dark: #020617;
    /* Slate 950 - Deepest Depth */

    --color-primary: #38BDF8;
    /* Sky 400 - Technical Blue for text/highlights */
    --color-primary-dark: #0EA5E9;
    /* For hover states */

    --color-accent: #D4AF37;
    /* Metallic Gold */
    --color-accent-hover: #b5952f;

    --color-text: #F8FAFC;
    /* Slate 50 */
    --color-text-muted: #94A3B8;
    /* Slate 400 */
    --color-text-light: #FFFFFF;

    --color-border: #334155;
    /* Slate 700 */

    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    /* Layout */
    --container-width: 1200px;
    --border-radius: 4px;
    --transition: all 0.3s ease;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(2rem, 4vw, 2.5rem);
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.5rem;
    color: var(--color-text-light);
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-muted);
}

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

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

ul {
    list-style: none;
}

/* Utilities */
.container {
    width: 90%;
    max-width: var(--container-width);
    margin: 0 auto;
}

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

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

/* Now Dark Slate 800 */
.bg-dark {
    background-color: var(--color-bg-dark);
}

.text-white {
    color: white;
}

.eyebrow {
    display: block;
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.1em;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.lead {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    max-width: 65ch;
    margin-bottom: var(--spacing-md);
}

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    font-weight: 600;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    text-align: center;
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
    /* White text on bright blue button */
    border: 2px solid var(--color-primary);
}

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

/* Small button variant for nav */
.btn-primary.sm {
    padding: 0.5rem 1.25rem;
    font-size: 0.9rem;
}

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

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

.full-width {
    width: 100%;
}

/* Header */
.header {
    background-color: rgba(15, 23, 42, 0.9);
    /* Dark semi-transparent */
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 0;
}

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

.logo img {
    height: 48px;
    width: auto;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-list a {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--color-text);
}

.nav-list a:hover {
    color: var(--color-primary);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 6px;
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--color-text);
}

/* Hero */
.hero {
    padding: 6rem 0;
    background: radial-gradient(circle at top right, #1e293b 0%, var(--color-bg) 100%);
    position: relative;
    overflow: hidden;
}

/* Faint technical grid background - Lighter opacity for dark mode */
.hero::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(var(--color-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.15;
    z-index: 0;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.cta-group {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    align-items: center;
}

.trust-bar {
    margin-top: var(--spacing-lg);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-muted);
    border-top: 1px solid var(--color-border);
    padding-top: var(--spacing-sm);
    display: inline-block;
}

/* Grids */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

/* Audience */
.audience-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.audience-item {
    border-left: 3px solid var(--color-accent);
    padding-left: var(--spacing-sm);
}

.audience-item h3 {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
    color: var(--color-text-light);
}

.audience-item p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: 0;
}

/* Services */
.services-grid {
    margin-top: var(--spacing-md);
}

.service-card {
    background: var(--color-bg-light);
    /* Dark Card */
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    /* Darker shadow */
    border-color: var(--color-primary);
    /* Blue border on hover */
}

.service-icon {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-primary);
    /* Blue Icon */
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-main);
    opacity: 0.5;
}

.service-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-light);
}

.service-list {
    list-style: disc;
    padding-left: 1.25rem;
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.service-list li {
    margin-bottom: 0.5rem;
}

/* Portfolio */
.projects-grid {
    margin-top: var(--spacing-md);
}

.project-card {
    background-color: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    overflow: hidden;
    position: relative;
    group: hover;
}

.project-img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    transition: transform 0.5s ease;
    /* Optional: Slight opacity/filter to blend better in dark mode */
    filter: brightness(0.9);
}

.project-img-placeholder {
    width: 100%;
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.7);
    font-weight: 600;
    background-size: cover;
    background-position: center;
}

/* Darker Gradients for placeholders */
.med-bg {
    background: linear-gradient(135deg, #0f172a, #1e293b);
}

.consumer-bg {
    background: linear-gradient(135deg, #020617, #334155);
}

.ind-bg {
    background: linear-gradient(135deg, #1e293b, #475569);
}

.project-card:hover .project-img {
    transform: scale(1.05);
    filter: brightness(1);
}

.project-info {
    padding: var(--spacing-md);
    background: var(--color-bg-light);
    position: relative;
    z-index: 2;
    border-top: 1px solid var(--color-border);
}

.project-cat {
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    display: block;
    margin-bottom: 0.5rem;
}

.project-info h3 {
    color: var(--color-text-light);
    font-size: 1.5rem;
}

.project-desc {
    color: var(--color-text-muted);
    margin-bottom: 0;
    font-size: 0.95rem;
}

/* About */
.about-stats {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: var(--spacing-md);
    padding-left: var(--spacing-md);
    border-left: 1px solid var(--color-border);
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-num {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-primary);
    /* Blue numbers */
    line-height: 1;
}

.stat-label {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-muted);
}

/* Contact */
.contact-wrapper {
    display: flex;
    gap: var(--spacing-lg);
    background: var(--color-bg-light);
    /* Dark wrapper */
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    align-items: flex-start;
    border: 1px solid var(--color-border);
}

.contact-content {
    flex: 1;
}

.contact-link {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-primary);
    margin: var(--spacing-sm) 0;
    display: block;
    border-bottom: 2px solid var(--color-primary-dark);
    display: inline-block;
}

.contact-form-container {
    flex: 1;
    background: var(--color-bg);
    /* Darker inset */
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
    background-color: var(--color-bg-light);
    color: var(--color-text);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.1);
}

/* Footer */
.footer {
    background-color: var(--color-bg-dark);
    padding: var(--spacing-md) 0;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--color-border);
}

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

.footer-logo {
    color: white;
    font-weight: 700;
}

/* Responsive */
@media (max-width: 900px) {

    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }

    .contact-wrapper {
        flex-direction: column;
    }

    .about-stats {
        padding-left: 0;
        border-left: none;
        flex-direction: row;
        justify-content: space-between;
        margin-top: var(--spacing-md);
        border-top: 1px solid var(--color-border);
        padding-top: var(--spacing-md);
    }
}

@media (max-width: 768px) {
    .header-container {
        padding: 0 1rem;
    }

    .nav-list {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-bg-light);
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
        border-bottom: 1px solid var(--color-border);
        align-items: flex-start;
        gap: 1rem;
    }

    .nav-list.active {
        display: flex;
    }

    .nav-list li {
        width: 100%;
    }

    .nav-list a {
        display: block;
        padding: 0.5rem 0;
        font-size: 1.1rem;
    }

    .nav-list .btn {
        margin-top: 0.5rem;
        display: inline-block;
        width: 100%;
    }

    .mobile-menu-btn {
        display: flex;
    }

    h1 {
        font-size: 2.5rem;
    }

    .hero {
        padding: 4rem 0;
    }

    .hero-content .lead {
        font-size: 1.1rem;
    }

    .section {
        padding: 3rem 0;
    }

    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }

    .cta-group {
        flex-direction: column;
        width: 100%;
        align-items: stretch;
    }

    .about-stats {
        flex-direction: column;
        gap: 1.5rem;
        align-items: center;
        text-align: center;
    }

    .stat-item {
        width: 100%;
        align-items: center;
    }

    .project-img {
        height: 200px;
    }

    .contact-link {
        font-size: 1.25rem;
        word-break: break-all;
    }
}