/* ======== GLOBAL STYLES & VARIABLES (PCB-INSPIRED THEME) ======== */
:root {
    /* PCB Color Palette */
    --primary-color: #00E676; /* Bright PCB Green (solder mask) */
    --primary-dark: #00C853; /* Darker PCB Green */
    --secondary-color: #FFFFFF; /* White silkscreen */
    --accent-color: #FFB300; /* Copper/Gold traces */
    --accent-copper: #D4A574; /* Authentic copper color */
    
    /* Background Colors - PCB substrate */
    --body-bg-color: #0D1117; /* Dark PCB substrate */
    --card-bg-color: #1C2128; /* Elevated PCB layer */
    --card-bg-alt: #22272E; /* Alternative card background */
    
    /* Text Colors - Enhanced contrast */
    --text-color: #E6EDF3; /* Bright white for main text */
    --text-color-light: #B8C5D0; /* Lighter gray with better contrast */
    --text-color-dim: #7D8590; /* Dimmed text */
    --white: #ffffff;
    
    /* Border & Effects - Circuit traces */
    --border-color: #3D444D; /* Visible borders */
    --border-bright: #00E676; /* Highlighted borders */
    --shadow: 0 4px 12px rgba(0, 230, 118, 0.1); /* Green glow */
    --shadow-strong: 0 8px 24px rgba(0, 230, 118, 0.2);
    
    /* Fonts */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-family-heading: 'Roboto Mono', 'Source Code Pro', monospace;
}

/* Import Google Fonts (Inter + Roboto Mono) */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;700&family=Roboto+Mono:wght@500;700&display=swap');

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--text-color);
    line-height: 1.7;
    background-color: var(--body-bg-color);
    padding-top: 80px; /* Offset for fixed navbar */
    /* Subtle PCB texture pattern */
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(0, 230, 118, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 179, 0, 0.02) 0%, transparent 50%);
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

h1, h2, h3, h4 {
    font-family: var(--font-family-heading);
    color: var(--secondary-color);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 1rem;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-color-light);
}

strong {
    color: var(--text-color);
    font-weight: 600;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--white);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    border-radius: 4px; /* Sharper edges */
}

section {
    padding: 6rem 0;
}

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

/* Alternating Section Backgrounds - PCB layers */
section:nth-of-type(even) {
    background-color: var(--card-bg-color);
    position: relative;
}

section:nth-of-type(even)::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color) 50%, transparent);
}

/* ======== UTILITY CLASSES (GRID) ======== */
.grid-col-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.grid-col-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.grid-col-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

/* ======== BUTTONS ======== */
.btn {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    font-family: var(--font-family-heading);
    font-weight: 700;
    border-radius: 2px; /* Sharper edges */
    transition: all 0.3s ease;
    border: 2px solid transparent;
    cursor: pointer;
    font-size: 0.95rem;
    text-transform: uppercase;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #000; /* Black text on green bg */
}

.btn-primary:hover {
    background-color: #00E676; /* Brighter green */
    color: #000;
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: #000;
    transform: translateY(-2px);
}

/* ======== NAVBAR ======== */
.navbar {
    background: var(--card-bg-color);
    border-bottom: 1px solid var(--border-color);
    box-shadow: none; /* Removed shadow for flat look */
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-family: var(--font-family-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--white);
}
.logo:hover {
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    align-items: center;
}

.nav-links a {
    color: var(--text-color-light);
    font-family: var(--font-family-heading);
    font-weight: 500;
    margin: 0 1rem;
    padding: 1rem 0;
    border-bottom: 2px solid transparent;
    text-transform: uppercase;
    font-size: 0.9rem;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.nav-links .btn {
    margin-left: 1.5rem;
}

.nav-toggle {
    display: none; /* Hidden on desktop */
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.hamburger {
    display: block;
    position: relative;
    width: 25px;
    height: 2px;
    background: var(--white);
}
.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background: var(--white);
    left: 0;
    transition: all 0.3s ease;
}
.hamburger::before { top: -8px; }
.hamburger::after { bottom: -8px; }

/* ======== HERO SECTION ======== */
.hero {
    background: linear-gradient(135deg, var(--body-bg-color) 0%, var(--card-bg-color) 100%);
    padding: 8rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
    /* PCB circuit grid pattern */
    background-image: 
        linear-gradient(rgba(0, 230, 118, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 230, 118, 0.05) 1px, transparent 1px),
        radial-gradient(circle at 10% 20%, rgba(0, 230, 118, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 90% 80%, rgba(255, 179, 0, 0.05) 0%, transparent 50%);
    background-size: 60px 60px, 60px 60px, 100% 100%, 100% 100%;
    border-bottom: 1px solid var(--border-color);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 50%, rgba(0, 230, 118, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.hero h1 {
    font-size: 3.5rem;
    max-width: 800px;
    margin: 0 auto 1.5rem auto;
    color: var(--white);
    text-shadow: 0 0 30px rgba(0, 230, 118, 0.3);
    position: relative;
    z-index: 1;
}

.hero .subtitle {
    font-size: 1.25rem;
    max-width: 700px;
    margin: 0 auto 2.5rem auto;
    color: var(--text-color-light);
    position: relative;
    z-index: 1;
}

.hero .btn {
    margin: 0 0.5rem;
}

/* ======== PAGE HEADER (For sub-pages) ======== */
.page-header {
    background-color: var(--body-bg-color);
    padding: 4rem 0;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}
.page-header h1 {
    color: var(--white);
    margin: 0;
}
.page-header p {
    color: var(--text-color-light);
    font-size: 1.15rem;
    max-width: 600px;
    margin: 0.5rem auto 0 auto;
}

/* ======== HOME ABOUT ======== */
.home-about {
    background: var(--body-bg-color);
}

.home-about img {
    border: 1px solid var(--border-color);
}

/* ======== CARDS ======== */
.card {
    background: var(--card-bg-color);
    padding: 2.5rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-copper));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.card:hover::before {
    opacity: 1;
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--border-bright);
    box-shadow: var(--shadow-strong);
    background: var(--card-bg-alt);
}

.card h3 {
    color: var(--primary-color);
    margin-bottom: 1.2rem;
}

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

.service-card {
    background: var(--card-bg-color);
    padding: 2.5rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.service-card:hover {
    border-color: var(--border-bright);
    box-shadow: var(--shadow-strong);
}

.service-card h3 {
    color: var(--white);
    border-left: 4px solid var(--primary-color);
    padding-left: 1rem;
}

.service-card p {
    color: var(--text-color-light);
}

/* ======== HOME WHY CHOOSE US ======== */
.home-why {
    background-color: var(--body-bg-color);
}

.home-why .section-title,
.home-why h3 {
    color: var(--white);
}

.home-why p {
    color: var(--text-color-light);
}

.feature-item h3 {
    color: var(--accent-color);
    margin-bottom: 0.8rem;
}

.feature-item p {
    color: var(--text-color-light);
}

/* ======== CALL TO ACTION (CTA) ======== */
.cta {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    color: #000;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

.cta h2 {
    color: #000;
    font-size: 2.5rem;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.cta p {
    color: rgba(0, 0, 0, 0.8);
    font-size: 1.15rem;
    margin-bottom: 2rem;
}

.cta .btn-primary {
    background: var(--white);
    color: #000;
    font-size: 1.1rem;
    padding: 1rem 2.5rem;
}

.cta .btn-primary:hover {
    background: var(--body-bg-color);
    color: var(--white);
}

/* ======== FOOTER ======== */
.footer {
    background: #101010; /* Even darker footer */
    color: var(--text-color-light);
    padding: 5rem 0;
    border-top: 1px solid var(--border-color);
}

.footer h3 {
    color: var(--white);
    margin-bottom: 1.5rem;
}

.footer p {
    color: var(--text-color-light);
    font-size: 0.9rem;
}

.footer ul li {
    margin-bottom: 0.8rem;
}

.footer ul li a {
    color: var(--text-color-light);
}

.footer ul li a:hover {
    color: var(--accent-color);
    padding-left: 5px;
}

/* ======== SERVICE PAGE STYLES ======== */
.service-list {
    list-style: none; /* Replaced disc with custom */
    padding-left: 0;
}
.service-list li {
    margin-bottom: 1rem;
    color: var(--text-color-light);
    position: relative;
    padding-left: 1.8rem;
}
/* Custom bullet point */
.service-list li::before {
    content: '>>';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--primary-color);
    font-family: monospace;
    font-weight: 700;
}
.service-list strong {
    color: var(--text-color);
}

/* ======== ABOUT PAGE (PROCESS) ======== */
.process-card {
    padding: 2rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--card-bg-color);
    transition: all 0.3s ease;
    position: relative;
    box-shadow: var(--shadow);
}

.process-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-copper));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.process-card:hover::after {
    transform: scaleX(1);
}

.process-card:hover {
    border-color: var(--border-bright);
    transform: translateY(-3px);
    box-shadow: var(--shadow-strong);
}

.process-card .phase {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-family: var(--font-family-heading);
    text-transform: uppercase;
    letter-spacing: 1px;
}
.process-card h3 {
    color: var(--white);
    margin-bottom: 0.5rem;
}
.process-card p {
    font-size: 0.9rem;
    color: var(--text-color-light);
    margin: 0;
}

/* ======== ABOUT PAGE (TABLE) ======== */
.tech-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 2rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}
.tech-table th, .tech-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
.tech-table th {
    background-color: var(--card-bg-color);
    font-family: var(--font-family-heading);
    color: var(--white);
}
.tech-table td {
    background: var(--body-bg-color);
}
.tech-table tr:last-child td {
    border-bottom: none;
}
.tech-table td:first-child {
    font-weight: 600;
    color: var(--primary-color);
    width: 30%;
    font-family: var(--font-family-heading);
}

/* ======== CONTACT PAGE ======== */
.form-group {
    margin-bottom: 1.5rem;
}
.form-group label {
    display: block;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--white);
    font-family: var(--font-family-heading);
}
.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 2px;
    font-family: var(--font-family);
    font-size: 1rem;
    background: var(--body-bg-color);
    color: var(--text-color);
}
.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--body-bg-color);
}
.form-group textarea {
    min-height: 150px;
    resize: vertical;
}
.form-group .btn {
    width: 100%;
}

.contact-details p {
    margin-bottom: 1.2rem;
    font-size: 1.1rem;
    color: var(--text-color);
}
.contact-details strong {
    color: var(--white);
    font-family: var(--font-family-heading);
}
.contact-details a {
    color: var(--accent-color);
}

/* ======== CLIENT LOGOS ======== */
.client-logos {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    align-items: stretch;
}

.logo-box {
    background: var(--body-bg-color);
    padding: 2rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 150px;
    transition: all 0.3s ease;
    overflow: hidden;
}

.logo-box:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
}

.logo-box img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    filter: grayscale(100%) opacity(0.7);
    transition: filter 0.3s ease;
}

.logo-box:hover img {
    filter: grayscale(0%) opacity(1);
}

/* ======== PROJECT BADGES ======== */
.project-badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    font-family: var(--font-family-heading);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.project-badge.testing {
    background-color: rgba(0, 200, 83, 0.2);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.project-badge.research {
    background-color: rgba(255, 215, 0, 0.2);
    color: #FFD700;
    border: 1px solid #FFD700;
}

.project-badge.development {
    background-color: rgba(100, 149, 237, 0.2);
    color: #6495ED;
    border: 1px solid #6495ED;
}

/* ======== RESPONSIVE DESIGN (MOBILE-FIRST) ======== */

@media (max-width: 1024px) {
    .grid-col-3 {
        grid-template-columns: 1fr 1fr;
    }
    .grid-col-4 {
        grid-template-columns: 1fr 1fr;
    }
    .client-logos {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    body {
        padding-top: 80px; /* Ensure content isn't hidden */
    }
    
    h1 { font-size: 2.5rem; }
    h2, .section-title { font-size: 1.8rem; }
    
    section { padding: 4rem 0; }
    
    .grid-col-2,
    .grid-col-3,
    .grid-col-4 {
        grid-template-columns: 1fr; /* Stack all grids on mobile */
    }
    
    .client-logos {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .logo-box {
        height: 120px;
    }

    .home-about img {
        grid-row: 1; /* Make image appear on top */
        margin-bottom: 2rem;
    }
    
    /* Contact page grid swap */
    .contact-grid .form-container {
        grid-row: 1; /* Form on top */
    }

    /* --- Mobile Navigation --- */
    .nav-links {
        position: fixed;
        top: 80px; /* Below navbar */
        left: 0;
        width: 100%;
        height: calc(100vh - 80px);
        background: var(--card-bg-color);
        flex-direction: column;
        align-items: flex-start;
        padding: 2rem;
        
        transform: translateX(100%);
        transition: transform 0.3s ease-in-out;
        overflow-y: auto;
        border-top: 1px solid var(--border-color);
    }
    
    .nav-open .nav-links {
        transform: translateX(0);
    }
    
    .nav-links a {
        font-size: 1.2rem;
        width: 100%;
        padding: 1rem;
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-links .btn {
        margin-top: 1rem;
        width: 100%;
        text-align: center;
    }
    
    .nav-toggle {
        display: block; /* Show hamburger */
    }

    /* Animate hamburger to 'X' */
    .nav-open .hamburger {
        background: transparent;
    }
    .nav-open .hamburger::before {
        background: var(--white);
        transform: rotate(45deg) translate(5px, 5px);
    }
    .nav-open .hamburger::after {
        background: var(--white);
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    .hero {
        padding: 4rem 0;
    }
    
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .hero .btn {
        display: block;
        width: 100%;
        margin: 1rem 0;
    }

    .footer .grid-col-4 {
        gap: 3rem;
    }
    
    /* Mobile Table Styles */
    .tech-table, .tech-table thead, .tech-table tbody, .tech-table th, .tech-table td, .tech-table tr {
        display: block;
    }
    
    .tech-table thead {
        display: none; /* Hide table header on mobile */
    }
    
    .tech-table tr {
        border: 1px solid var(--border-color);
        margin-bottom: 1rem;
        border-radius: 4px;
        background: var(--card-bg-color);
    }
    
    .tech-table td {
        border: none;
        border-bottom: 1px solid var(--border-color);
        position: relative;
        padding-left: 50%; /* Make space for label */
        background: transparent;
    }
    
    .tech-table td:before {
        /* Use data-label for mobile view */
        position: absolute;
        left: 1rem;
        width: 40%;
        padding-right: 10px;
        white-space: nowrap;
        font-weight: 700;
        color: var(--white);
        font-family: var(--font-family-heading);
        content: attr(data-label);
    }
    
    .tech-table tr:last-child td:last-child {
        border-bottom: none;
    }
}