/* --- Design System: Premium Tech & Editorial (Senior Engineer) --- */
:root {
    /* Sophisticated Dark Mode Theme */
    --bg-primary: #030712;
    --bg-secondary: rgba(17, 24, 39, 0.45);
    --bg-tertiary: rgba(31, 41, 55, 0.5);
    
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    --accent-primary: #06b6d4; /* Teal / Cyan */
    --accent-secondary: #10b981; /* Emerald */
    --accent-glow: rgba(6, 182, 212, 0.08);
    
    --glass-border: rgba(255, 255, 255, 0.04);
    --glass-shadow: rgba(0, 0, 0, 0.4);
    
    /* Typography */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --transition-premium: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    --border-radius-lg: 12px;
    --border-radius-md: 6px;
}

/* Light Theme Overrides (Sophisticated Minimalist White) */
[data-theme="light"] {
    --bg-primary: #fafafa;
    --bg-secondary: rgba(255, 255, 255, 0.7);
    --bg-tertiary: rgba(243, 244, 246, 0.8);
    
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;
    
    --accent-primary: #0891b2;
    --accent-secondary: #059669;
    --accent-glow: rgba(8, 145, 178, 0.05);
    
    --glass-border: rgba(17, 24, 39, 0.05);
    --glass-shadow: rgba(17, 24, 39, 0.02);
}

/* --- Base Layout & Blueprint Background --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.7;
    overflow-x: hidden;
    transition: background-color 0.5s ease, color 0.5s ease;
}

/* Technical Grid Background Pattern */
.tech-grid-overlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: -2;
    background-image: 
        linear-gradient(var(--glass-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--glass-border) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.65;
}

/* Elegant Light Leaks (Spotlights) */
.spotlight {
    position: fixed;
    border-radius: 50%;
    filter: blur(120px);
    pointer-events: none;
    z-index: -1;
    opacity: 0.35;
    transition: var(--transition-premium);
}

.spotlight-1 {
    inline-size: 600px;
    block-size: 600px;
    inset-block-start: -200px;
    inset-inline-start: -150px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.15) 0%, transparent 70%);
}

.spotlight-2 {
    inline-size: 800px;
    block-size: 800px;
    inset-block-end: -250px;
    inset-inline-end: -200px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.1) 0%, transparent 70%);
}

[data-theme="light"] .spotlight {
    opacity: 0.15;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
    inline-size: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}

/* --- Navigation Header --- */
.navbar {
    position: fixed;
    inset-block-start: 0;
    inset-inline: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 6%;
    background-color: rgba(3, 7, 18, 0.4);
    backdrop-filter: blur(12px);
    border-block-end: 1px solid var(--glass-border);
    transition: var(--transition-premium);
}

[data-theme="light"] .navbar {
    background-color: rgba(250, 250, 250, 0.7);
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo-sym {
    color: var(--accent-primary);
    opacity: 0.8;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition-premium);
    letter-spacing: -0.2px;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
    text-shadow: 0 0 10px var(--accent-glow);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

/* --- Theme Toggle --- */
.theme-toggle-btn {
    background: transparent;
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    inline-size: 38px;
    block-size: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-premium);
}

.theme-toggle-btn:hover {
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.theme-toggle-btn .sun-icon {
    display: none;
}

[data-theme="light"] .theme-toggle-btn .moon-icon {
    display: none;
}

[data-theme="light"] .theme-toggle-btn .sun-icon {
    display: block;
}

/* --- Buttons --- */
.cta-button {
    font-family: var(--font-heading);
    font-weight: 600;
    text-decoration: none;
    padding: 0.65rem 1.25rem;
    border-radius: var(--border-radius-md);
    font-size: 0.85rem;
    transition: var(--transition-premium);
    cursor: pointer;
}

.nav-cta {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
}

.nav-cta:hover {
    background: var(--text-primary);
    color: var(--bg-primary);
    border-color: var(--text-primary);
}

.primary-cta {
    background: var(--text-primary);
    color: var(--bg-primary);
    border: 1px solid var(--text-primary);
}

.primary-cta:hover {
    background: transparent;
    color: var(--text-primary);
    transform: translateY(-2px);
}

.secondary-cta {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--glass-border);
    margin-inline-start: 1rem;
}

.secondary-cta:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
    transform: translateY(-2px);
}

/* --- Layout Grid --- */
.main-layout {
    display: flex;
    flex-direction: column;
    gap: 12rem;
    padding-block: 8rem 6rem;
    padding-inline: 6%;
    max-inline-size: 1300px;
    margin: 0 auto;
}

/* Section Architecture */
.section-meta {
    font-family: var(--font-mono);
    color: var(--accent-primary);
    font-size: 0.8rem;
    letter-spacing: 2px;
    margin-block-end: 1rem;
}

.section-header {
    margin-block-end: 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    line-height: 1.2;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-block-start: 0.5rem;
}

/* --- Hero Section --- */
.hero-section {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    align-items: center;
    gap: 6rem;
    min-block-size: 65dvh;
}

.experience-badge {
    display: inline-block;
    background: rgba(6, 182, 212, 0.08);
    border: 1px solid rgba(6, 182, 212, 0.15);
    color: var(--accent-primary);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.35rem 0.85rem;
    border-radius: 50px;
    margin-block-end: 1.5rem;
    letter-spacing: 0.5px;
}

.hero-title {
    font-size: clamp(2.5rem, 5.5vw, 4.25rem);
    line-height: 1.05;
    letter-spacing: -2px;
    margin-block-end: 2rem;
}

.hero-desc {
    color: var(--text-secondary);
    font-size: 1.15rem;
    max-inline-size: 580px;
    margin-block-end: 3rem;
}

/* High-Impact Stat Matrix */
.hero-metrics {
    display: grid;
    grid-template-rows: repeat(3, 1fr);
    gap: 1.5rem;
}

.metric-card {
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    padding: 1.5rem 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 4px 20px var(--glass-shadow);
    display: flex;
    flex-direction: column;
    transition: var(--transition-premium);
}

.metric-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-primary);
    box-shadow: 0 8px 30px rgba(6, 182, 212, 0.08);
}

.metric-value {
    font-family: var(--font-heading);
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1;
}

.metric-label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--accent-primary);
    margin-block: 0.5rem 0.25rem;
}

.metric-sub {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* --- Expertise Section --- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 6rem;
}

.about-narrative p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-block-end: 3.5rem;
}

.subsection-title {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-block-end: 2rem;
    font-family: var(--font-heading);
}

.edu-timeline {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.edu-node {
    position: relative;
    padding-inline-start: 1.5rem;
    border-inline-start: 1px solid var(--glass-border);
}

.edu-node::before {
    content: '';
    position: absolute;
    inset-inline-start: -3.5px;
    inset-block-start: 8px;
    inline-size: 6px;
    block-size: 6px;
    background-color: var(--accent-primary);
    border-radius: 50%;
}

.edu-year {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.edu-node h4 {
    font-size: 1.05rem;
    margin-block: 0.25rem 0.1rem;
}

.edu-org {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.edu-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Skills Performance Bar Styling */
.skills-architecture {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.skill-group h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    margin-block-end: 1.5rem;
    letter-spacing: -0.2px;
}

.skill-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.skill-item {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.skill-item span {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.skill-bar {
    inline-size: 100%;
    block-size: 4px;
    background-color: var(--bg-tertiary);
    border-radius: 2px;
    overflow: hidden;
}

.skill-bar .fill {
    block-size: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 2px;
}

/* --- Professional Experience Timeline --- */
.experience-tabs-container {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 5rem;
}

.experience-sidebar {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.exp-tab-btn {
    background: transparent;
    border: 1px solid transparent;
    text-align: start;
    padding: 1.25rem;
    cursor: pointer;
    border-radius: var(--border-radius-md);
    transition: var(--transition-premium);
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.exp-tab-btn:hover {
    background: var(--bg-secondary);
    border-color: var(--glass-border);
}

.exp-tab-btn.active {
    background: var(--bg-secondary);
    border-color: var(--glass-border);
    border-inline-start: 3px solid var(--accent-primary);
}

.exp-company {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.exp-title {
    font-size: 0.85rem;
    color: var(--accent-primary);
    font-weight: 500;
}

.exp-date {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Exp Content Panels */
.exp-content {
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    border-radius: var(--border-radius-lg);
    padding: 3rem;
    box-shadow: 0 4px 30px var(--glass-shadow);
}

.exp-panel {
    animation: fadeIn 0.4s ease-out;
}

.exp-panel[hidden] {
    display: none;
}

.exp-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-block-end: 1px solid var(--glass-border);
    padding-block-end: 1.5rem;
    margin-block-end: 2rem;
}

.exp-header h3 {
    font-size: 1.35rem;
}

.company-glow {
    color: var(--accent-primary);
}

.exp-loc {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

.exp-details {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.exp-details li {
    position: relative;
    padding-inline-start: 1.5rem;
    color: var(--text-secondary);
    font-size: 1rem;
}

.exp-details li::before {
    content: "→";
    color: var(--accent-primary);
    position: absolute;
    inset-inline-start: 0;
    inset-block-start: 0;
}

/* --- Projects & Terminal --- */
.terminal-container {
    background-color: #0d1117;
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-lg);
    margin-block-end: 4rem;
    overflow: hidden;
    box-shadow: 0 10px 40px var(--glass-shadow);
}

.terminal-header {
    background-color: #161b22;
    padding: 0.75rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-block-end: 1px solid rgba(255,255,255,0.05);
}

.terminal-buttons {
    display: flex;
    gap: 0.5rem;
}

.term-btn {
    inline-size: 12px;
    block-size: 12px;
    border-radius: 50%;
    display: inline-block;
}

.term-btn.close { background-color: #ff5f56; }
.term-btn.minimize { background-color: #ffbd2e; }
.term-btn.expand { background-color: #27c93f; }

.terminal-title {
    color: #8b949e;
    font-family: var(--font-mono);
    font-size: 0.8rem;
}

.terminal-body {
    padding: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: #c9d1d9;
}

.terminal-line {
    margin-block-end: 0.5rem;
}

.term-prompt {
    color: var(--accent-secondary);
}

.code-block {
    color: #58a6ff;
    padding-inline-start: 1rem;
}

.typing-cursor {
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    50% { opacity: 0; }
}

/* Projects Cards Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.project-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    border-radius: var(--border-radius-lg);
    padding: 2.25rem;
    display: flex;
    flex-direction: column;
    transition: var(--transition-premium);
    box-shadow: 0 4px 20px var(--glass-shadow);
}

.project-card:hover {
    transform: translateY(-6px);
    border-color: var(--accent-primary);
    box-shadow: 0 8px 30px rgba(6, 182, 212, 0.1);
}

.project-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-block-end: 1.5rem;
}

.project-num {
    font-family: var(--font-mono);
    color: var(--text-muted);
    font-size: 0.85rem;
}

.gh-icon {
    color: var(--text-secondary);
    transition: var(--transition-premium);
}

.gh-icon:hover {
    color: var(--accent-primary);
}

.project-card h3 {
    font-size: 1.25rem;
    margin-block-end: 0.75rem;
}

.project-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-block-end: 2rem;
    flex-grow: 1;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.project-tags span {
    background-color: var(--bg-tertiary);
    padding: 0.25rem 0.6rem;
    border-radius: var(--border-radius-md);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
}

/* --- Contact Section --- */
.contact-card-wrapper {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 4rem;
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    border-radius: var(--border-radius-lg);
    padding: 3.5rem;
    box-shadow: 0 4px 30px var(--glass-shadow);
}

.contact-details-panel h3 {
    font-size: 1.5rem;
    margin-block-end: 1rem;
}

.contact-details-panel p {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-block-end: 3rem;
}

.detail-items {
    display: flex;
    flex-direction: column;
    gap: 2.25rem;
}

.detail-lbl {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 1px;
    display: block;
    margin-block-end: 0.25rem;
}

.detail-val {
    color: var(--text-primary);
    font-size: 1.1rem;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-premium);
}

.detail-val:hover {
    color: var(--accent-primary);
}

.detail-social-row {
    display: flex;
    gap: 1.5rem;
}

.detail-social-row a {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-premium);
}

.detail-social-row a:hover {
    color: var(--text-primary);
}

/* Form Styles */
.senior-contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.senior-contact-form .form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.senior-contact-form label {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.senior-contact-form input, .senior-contact-form textarea {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 0.85rem 1.1rem;
    border-radius: var(--border-radius-md);
    font-family: var(--font-body);
    outline: none;
    font-size: 0.95rem;
    transition: var(--transition-premium);
}

.senior-contact-form input:focus, .senior-contact-form textarea:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 10px rgba(6, 182, 212, 0.1);
}

.form-status-msg {
    font-size: 0.9rem;
    font-family: var(--font-heading);
    margin-block-start: 1rem;
    padding: 0.75rem;
    border-radius: var(--border-radius-md);
    display: none;
    transition: var(--transition-premium);
}

.form-status-msg.success {
    display: block;
    background-color: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: var(--accent-secondary);
}

.form-status-msg.error {
    display: block;
    background-color: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #ef4444;
}

/* --- Footer --- */
.site-footer {
    border-block-start: 1px solid var(--glass-border);
    padding-block: 2.5rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-block-start: 8rem;
}

/* --- Fade In Keyframe --- */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Responsive Adaptations --- */
@media (max-width: 1024px) {
    .hero-section {
        grid-template-columns: 1fr;
        gap: 4rem;
        text-align: center;
    }
    .hero-desc {
        margin-inline: auto;
    }
    .hero-metrics {
        grid-template-columns: repeat(3, 1fr);
        grid-template-rows: 1fr;
        gap: 1rem;
    }
    .about-grid {
        grid-template-columns: 1fr;
        gap: 5rem;
    }
    .experience-tabs-container {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
    .experience-sidebar {
        flex-direction: row;
        border-block-end: 1px solid var(--glass-border);
        padding-block-end: 1rem;
        overflow-x: auto;
    }
    .exp-tab-btn {
        flex-direction: row;
        align-items: center;
        gap: 0.75rem;
        white-space: nowrap;
    }
    .exp-tab-btn.active {
        border-inline-start: 1px solid var(--glass-border);
        border-block-end: 3px solid var(--accent-primary);
    }
    .contact-card-wrapper {
        grid-template-columns: 1fr;
        gap: 4rem;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: 1rem 5%;
    }
    .nav-links {
        display: none;
    }
    .hero-metrics {
        grid-template-columns: 1fr;
    }
    .theme-toggle-btn {
        margin-inline-start: auto;
    }
    .exp-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    .form-row {
        grid-template-columns: 1fr;
    }
    .contact-card-wrapper {
        padding: 2rem;
    }
}