/* Global Styling Variables */
:root {
    --primary-color: #0070f3; /* Engineering Blue */
    --text-main: #111111;
    --text-muted: #555555;
    --bg-light: #f7f9fa;
    --bg-white: #ffffff;
    --navbar-bg: #0f172a; /* Sleek Deep Slate */
    --scroll-behavior: smooth; /* Smooth transitions across navigation anchor tags */
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-main);
    background-color: var(--bg-light);
    line-height: 1.6;
}

/* Navigation Menu - Glassmorphism Engineering Style */
header {
    background-color: rgba(15, 23, 42, 0.9); /* Transparent Deep Slate */
    backdrop-filter: blur(12px); /* Blurred glass effect */
    -webkit-backdrop-filter: blur(12px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transition: all 0.3s ease;
}

/* Scroll Active State (Triggered by JavaScript) */
header.scroll-active {
    background-color: #0f172a; /* Solid dark color when scrolling */
    border-bottom: 2px solid var(--primary-color); /* Electrical blue accent line */
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    padding: -0.2rem 0; /* Shrinks the navbar slightly on scroll */
}

.navbar {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 2rem;
    transition: padding 0.3s ease;
}

header.scroll-active .navbar {
    padding: 0.9rem 2rem; /* Smooth size transformation */
}

.logo {
    color: #ffffff;
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    text-transform: uppercase;
    font-family: system-ui, -apple-system, sans-serif;
}

.logo span {
    color: var(--primary-color);
    position: relative;
}

/* Subtle circuit node dot indicator over the logo name */
.logo span::after {
    content: '';
    position: absolute;
    width: 5px;
    height: 5px;
    background-color: #059669; /* Battery Green Node */
    border-radius: 50%;
    top: -2px;
    right: -7px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.2rem;
}

.nav-links a {
    color: #94a3b8; /* Muted Slate */
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.3px;
    transition: all 0.2s ease;
    position: relative;
    padding: 0.4rem 0;
}

/* Interactive sliding circuit line indicator below links on hover */
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.2s ease;
}

.nav-links a:hover {
    color: #ffffff;
}

.nav-links a:hover::after {
    width: 100%;
}

/* Hero Banner Layout */
.hero-section {
    padding: 11rem 2rem 6rem; /* Keeps exactly 11rem of safety space at the top */
    background-color: var(--bg-white);
    display: flex;
    justify-content: center;
    text-align: center;
}

.hero-container {
    max-width: 800px;
}

.hero-subtitle {
    color: var(--primary-color);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 1.5px;
    margin-bottom: 1rem;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -1px;
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
}

/* Standard Buttons */
.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    font-weight: 600;
    border-radius: 6px;
    text-decoration: none;
    transition: all 0.2s;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: #0051b3;
}

.btn-secondary {
    background-color: #e2e8f0;
    color: #334155;
}

.btn-secondary:hover {
    background-color: #cbd5e1;
}

/* Sections Structure */
.about-section, .apps-section, .contact-section {
    padding: 6rem 2rem;
}

.section-container {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    letter-spacing: -0.5px;
}

.section-subtitle {
    color: var(--text-muted);
    margin-bottom: 3rem;
}

/* Placeholder Application Card */
/* Updated App Layout Grid */
.apps-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    justify-content: center;
    margin-top: 2rem;
}

/* Custom Alternative Badge Colors */
.card-badge.bg-battery {
    background-color: #ecfdf5;
    color: #059669; /* Battery Green Accent */
}

.btn-battery {
    background-color: #059669;
}

.btn-battery:hover {
    background-color: #047857;
}

.placeholder-card {
    background-color: var(--bg-white);
    border: 2px dashed #cbd5e1;
    border-radius: 8px;
    padding: 3rem;
    max-width: 450px;
    width: 100%;
}

.placeholder-card h3 {
    margin-bottom: 0.5rem;
    color: #64748b;
}

/* Footer Section */
footer {
    background-color: var(--navbar-bg);
    color: #64748b;
    text-align: center;
    padding: 2rem;
    font-size: 0.9rem;
}
/* Calculator Grid & Layout Styling */
.calculation-card {
    background-color: var(--bg-white);
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 2.5rem;
    max-width: 600px;
    width: 100%;
    text-align: left;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.app-card-header h3 {
    font-size: 1.4rem;
    color: var(--navbar-bg);
    margin-bottom: 0.25rem;
}

.card-subtitle {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

/* Forms and Typography Blocks */
.engineering-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    flex: 1;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: #334155;
}

.form-group-title {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--primary-color);
    margin-top: 0.5rem;
}

/* Custom Interactive Intputs */
.eng-input, .eng-select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1.5px solid #cbd5e1;
    border-radius: 6px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

.eng-input:focus, .eng-select:focus {
    border-color: var(--primary-color);
}

.ambient-style {
    background-color: #fffbeb;
    border-color: #fef3c7;
}

.ambient-style:focus {
    border-color: #d97706;
}

.form-twin-row, .form-triple-row {
    display: flex;
    gap: 1rem;
}

/* Button & Calculation Outputs */
.btn-calc {
    background-color: var(--navbar-bg);
    color: #ffffff;
    width: 100%;
    border: none;
    cursor: pointer;
    padding: 1rem;
    margin-top: 0.5rem;
}

.btn-calc:hover {
    background-color: var(--primary-color);
}

.results-display {
    margin-top: 2rem;
    padding: 1.5rem;
    background-color: #f8fafc;
    border-left: 4px solid var(--primary-color);
    border-radius: 4px;
}

.results-display h4 {
    margin-bottom: 1rem;
    color: var(--navbar-bg);
}

.result-metric {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid #e2e8f0;
}

.result-metric:last-child {
    border-bottom: none;
}

.text-alert {
    color: #b91c1c;
}

.hidden {
    display: none;
}
/* App Link Card Styling Layout */
.app-link-card {
    background-color: var(--bg-white);
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 2.5rem;
    max-width: 500px;
    width: 100%;
    text-align: left;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    position: relative;
}

.card-badge {
    display: inline-block;
    background-color: #e0f2fe;
    color: var(--primary-color);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.app-link-card h3 {
    font-size: 1.4rem;
    color: var(--navbar-bg);
    margin-bottom: 0.75rem;
}

.app-link-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 2rem;
    line-height: 1.5;
}

.btn-app-link {
    background-color: var(--primary-color);
    color: #ffffff;
    display: block;
    text-align: center;
    border: none;
}

.btn-app-link:hover {
    background-color: var(--navbar-bg);
}
/* Navigation Link Back to Home */
.nav-control-header {
    width: 100%;
    max-width: 390px;
    margin: 15px auto 12px;
    text-align: left;
    padding: 0 10px;
}

.back-home-link {
    display: inline-block;
    color: #1a759f; /* Transformer Blue theme color */
    text-decoration: none;
    font-size: 13px;
    font-weight: 700;
    padding: 6px 12px;
    background-color: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(26, 117, 159, 0.3);
    border-radius: 8px;
    transition: all 0.2s ease;
}

.back-home-link:hover {
    background-color: #1a759f;
    color: #ffffff;
    border-color: #1a759f;
    box-shadow: 0 2px 8px rgba(26, 117, 159, 0.2);
}
/* Professional Background Component Layout */
.text-left-align {
    text-align: left !important;
}

.section-intro {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 3rem;
    max-width: 900px;
}

.about-flex-layout {
    display: flex;
    gap: 3.5rem;
    flex-wrap: wrap;
}

.about-column {
    flex: 1;
    min-width: 300px;
}

.about-column h3 {
    font-size: 1.3rem;
    color: var(--navbar-bg);
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

/* Competency Grid Badges */
.skills-tags-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.skills-tags-list li {
    background-color: #f1f5f9;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 600;
    color: #334155;
    border-left: 3px solid var(--primary-color);
}

/* Professional Timeline Nodes */
.timeline-item {
    margin-bottom: 1.75rem;
    padding-left: 1rem;
    border-left: 2px solid #cbd5e1;
}

.timeline-item h4 {
    font-size: 1.1rem;
    color: var(--navbar-bg);
}

.company-sub {
    font-size: 0.85rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.4rem;
}

.role-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.5;
}
/* Interactive Contact Form Styling and Layouts */
.portfolio-contact-form {
    max-width: 650px;
    margin: 0 auto;
    text-align: left;
    background-color: var(--bg-white);
    padding: 2.5rem;
    border-radius: 12px;
    border: 1px solid #e2e8f0;
    box-shadow: 0 4px 20px rgba(15, 23, 42, 0.04);
}

.form-row-twin {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.25rem;
}

.form-input-block {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    flex: 1;
    min-width: 250px;
    margin-bottom: 1.25rem;
}

.form-input-block label {
    font-size: 0.85rem;
    font-weight: 700;
    color: #334155;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-input-block input, .form-input-block textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1.5px solid #cbd5e1;
    border-radius: 6px;
    font-size: 0.95rem;
    font-family: inherit;
    outline: none;
    transition: all 0.2s ease;
}

.form-input-block input:focus, .form-input-block textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 112, 243, 0.1);
}

.btn-form-submit {
    width: 100%;
    border: none;
    cursor: pointer;
    text-align: center;
    padding: 1rem;
    font-size: 1rem;
}
/* Professional Mobile Responsiveness Patch */
@media (max-width: 768px) {
    /* Stack the profile columns vertically on mobile */
    .about-flex-layout {
        flex-direction: column;
        gap: 2rem;
    }

    /* Keep the profile headshot centered on small viewports */
    .profile-photo-wrapper {
        justify-content: center;
        margin-bottom: 1rem;
    }

    /* Add side spacing inside the contact form for mobile edges */
    .portfolio-contact-form {
        padding: 1.5rem;
    }

    /* Stack twin inputs on top of each other on mobile phones */
    .form-row-twin {
        flex-direction: column;
        gap: 0;
    }

    /* Shrink large hero title fonts slightly so they don't break lines awkwardly */
    .hero-title {
        font-size: 2.2rem;
    }
}
.form-input-block input:focus, 
.form-input-block textarea:focus {
    border-color: var(--primary-color) !important;
    box-shadow: 0 0 0 4px rgba(0, 112, 243, 0.15) !important;
    background-color: #ffffff;
}
/* Top Layout Intro Alignment */
.profile-intro-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
    margin-bottom: 2.5rem;
}

.profile-intro-row .section-intro {
    margin-bottom: 0; /* Clear previous margin spacing so it aligns with the photo center */
    flex: 1;
}

.profile-photo-wrapper {
    flex-shrink: 0; /* Prevents the image container from squeezing */
}

.profile-inline-image {
    width: 140px;              
    height: 140px;
    object-fit: cover;         
    border-radius: 50%;        
    border: 3px solid #ffffff;
    box-shadow: 0 4px 15px rgba(15, 23, 42, 0.12);
}

/* Ensure bottom columns sit nicely below the top intro row */
.about-flex-layout {
    display: flex;
    gap: 3.5rem;
    flex-wrap: wrap;
}