/* ============================================
   Utkarsh Paliwal Portfolio - Styles
   A dark, sophisticated design for senior engineers
   ============================================ */

/* CSS Variables */
:root {
    /* Colors - Deep navy with warm accents */
    --bg-primary: #0a0f1a;
    --bg-secondary: #111827;
    --bg-tertiary: #1a2234;
    --bg-card: #151d2e;
    
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --accent-primary: #38bdf8;
    --accent-secondary: #818cf8;
    --accent-warm: #fbbf24;
    --accent-green: #34d399;
    
    --border-color: #1e293b;
    --border-subtle: rgba(148, 163, 184, 0.1);
    
    /* Typography */
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --font-serif: 'Source Serif 4', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --section-padding: clamp(4rem, 10vw, 8rem);
    --container-max: 1200px;
    --container-padding: clamp(1.5rem, 5vw, 3rem);
    
    /* Animation */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

/* Light Mode */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-card: #ffffff;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    
    --accent-primary: #0284c7;
    --accent-secondary: #6366f1;
    --accent-warm: #f59e0b;
    --accent-green: #059669;
    
    --border-color: #e2e8f0;
    --border-subtle: rgba(15, 23, 42, 0.08);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-secondary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Grain overlay for texture */
.grain {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

[data-theme="light"] .grain {
    opacity: 0.015;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    line-height: 1.3;
    font-weight: 600;
}

h1 {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 600;
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    letter-spacing: -0.01em;
}

h3 {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
}

p {
    max-width: 65ch;
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--text-primary);
}

em {
    font-style: italic;
    color: var(--text-primary);
}

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

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem var(--container-padding);
    background: rgba(10, 15, 26, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-subtle);
}

[data-theme="light"] .nav {
    background: rgba(255, 255, 255, 0.85);
    border-bottom: 1px solid var(--border-color);
}

.nav-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    padding: 0.5rem 0.75rem;
    border: 2px solid var(--accent-primary);
    transition: all var(--transition-fast);
}

.nav-logo:hover {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

[data-theme="light"] .nav-logo {
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

[data-theme="light"] .nav-logo:hover {
    background: var(--accent-primary);
    color: #ffffff;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.nav-cta {
    padding: 0.5rem 1.25rem;
    background: var(--accent-primary);
    color: var(--bg-primary) !important;
    border-radius: 4px;
    font-weight: 600;
}

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

[data-theme="light"] .nav-cta {
    color: #ffffff !important;
}

[data-theme="light"] .nav-cta:hover {
    background: var(--accent-secondary);
}

/* Theme Toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: 1.125rem;
}

.theme-toggle:hover {
    border-color: var(--accent-primary);
    transform: rotate(180deg);
}

.theme-icon {
    display: block;
    line-height: 1;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    padding: calc(80px + var(--section-padding)) var(--container-padding) var(--section-padding);
    max-width: var(--container-max);
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--accent-primary);
    padding: 0.375rem 0.875rem;
    border: 1px solid var(--accent-primary);
    border-radius: 2px;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.6s ease both;
}

.hero-name {
    margin-bottom: 1rem;
    animation: fadeInUp 0.6s ease 0.1s both;
}

.hero-tagline {
    font-size: clamp(1.125rem, 2.5vw, 1.375rem);
    color: var(--text-secondary);
    margin-bottom: 2rem;
    animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
    animation: fadeInUp 0.6s ease 0.3s both;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.meta-icon {
    color: var(--accent-warm);
    font-size: 0.5rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    animation: fadeInUp 0.6s ease 0.4s both;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: 4px;
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

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

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* Terminal Visual */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.8s ease 0.5s both;
}

.terminal {
    width: 100%;
    max-width: 420px;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: 
        0 4px 6px -1px rgba(0, 0, 0, 0.3),
        0 20px 40px -10px rgba(0, 0, 0, 0.4);
}

.terminal-header {
    display: flex;
    gap: 8px;
    padding: 14px 16px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.terminal-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-muted);
}

.terminal-dot:first-child { background: #ef4444; }
.terminal-dot:nth-child(2) { background: #fbbf24; }
.terminal-dot:nth-child(3) { background: #22c55e; }

.terminal-body {
    padding: 1.25rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.8;
}

.terminal-line {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 0.25rem;
}

.terminal-prompt {
    color: var(--accent-green);
}

.terminal-text {
    color: var(--text-primary);
}

.terminal-output {
    color: var(--text-muted);
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
}

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

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* Sections */
.section {
    padding: var(--section-padding) var(--container-padding);
    max-width: var(--container-max);
    margin: 0 auto;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 3rem;
}

.section-number {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--accent-primary);
}

.section-title {
    position: relative;
}

.section-title::after {
    content: '';
    display: inline-block;
    width: clamp(100px, 20vw, 300px);
    height: 1px;
    background: var(--border-color);
    margin-left: 1.5rem;
    vertical-align: middle;
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
}

.about-text {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.about-lead {
    font-size: 1.125rem;
    color: var(--text-primary);
    line-height: 1.8;
}

.about-sidebar {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.tech-stack h3 {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.tech-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.tech-list li {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1rem;
}

.tech-list li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

/* Strengths Section */
.strengths {
    background: var(--bg-secondary);
    max-width: none;
    padding-left: var(--container-padding);
    padding-right: var(--container-padding);
}

.strengths .section-header,
.strengths .strengths-grid {
    max-width: var(--container-max);
    margin-left: auto;
    margin-right: auto;
}

.strengths-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.strength-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    transition: all var(--transition-base);
}

.strength-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
}

.strength-icon {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.strength-card h3 {
    margin-bottom: 0.75rem;
}

.strength-card p {
    font-size: 0.9375rem;
    color: var(--text-muted);
}

/* Case Study Section */
.case-study {
    border-top: 1px solid var(--border-color);
}

.case-study-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: clamp(2rem, 5vw, 4rem);
}

.case-header {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.case-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent-warm);
    display: block;
    margin-bottom: 0.75rem;
}

.case-title {
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: 0.5rem;
}

.case-subtitle {
    font-size: 1rem;
    color: var(--text-muted);
}

.case-section {
    margin-bottom: 2.5rem;
}

.case-section h4 {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.case-section p {
    margin-bottom: 1rem;
}

.case-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.case-list li {
    position: relative;
    padding-left: 1.5rem;
}

.case-list li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

/* Decision Grid */
.decision-grid {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.decision {
    background: var(--bg-tertiary);
    border-left: 3px solid var(--accent-secondary);
    padding: 1.5rem;
    border-radius: 0 8px 8px 0;
}

.decision-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent-secondary);
    display: block;
    margin-bottom: 0.25rem;
}

.decision p {
    margin-bottom: 1rem;
}

.decision p:last-child {
    margin-bottom: 0;
    color: var(--text-muted);
    font-size: 0.9375rem;
}

/* Outcomes Grid */
.outcomes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
}

.outcome {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.outcome-value {
    display: block;
    font-family: var(--font-mono);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
    color: var(--accent-green);
    margin-bottom: 0.5rem;
}

.outcome-label {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

/* Tech Tags */
.case-tech {
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

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

.tech-tag {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    padding: 0.375rem 0.875rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-secondary);
}

/* What I'm Known For Section */
.known-for-content {
    max-width: 800px;
}

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

.known-for-list li {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.7;
}

.known-for-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: 600;
}

.known-for-list li strong {
    color: var(--text-primary);
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.project-header h3 {
    font-size: 1.125rem;
}

.project-type {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-warm);
    white-space: nowrap;
}

.project-desc {
    font-size: 0.9375rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    flex-grow: 1;
}

.project-impact {
    font-size: 0.9375rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: 6px;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: auto;
}

.project-tech span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    padding: 0.25rem 0.625rem;
    background: var(--bg-primary);
    border-radius: 4px;
}

/* How I Work Section */
.how-i-work {
    background: var(--bg-secondary);
    max-width: none;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.how-i-work .section-header,
.how-i-work .work-grid {
    max-width: var(--container-max);
    margin-left: auto;
    margin-right: auto;
}

.work-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.work-item h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.work-item p {
    font-size: 0.9375rem;
    color: var(--text-muted);
}

/* Looking For Section */
.looking-content {
    max-width: 900px;
}

.looking-lead {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 2.5rem;
}

.looking-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.looking-item {
    padding: 1.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.looking-item h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--accent-primary);
}

.looking-item p {
    font-size: 0.9375rem;
    color: var(--text-muted);
}

/* Contact Section */
.contact {
    text-align: center;
    padding-top: calc(var(--section-padding) * 1.5);
    padding-bottom: calc(var(--section-padding) * 1.5);
    border-top: 1px solid var(--border-color);
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
}

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

.contact-text {
    font-size: 1.0625rem;
    margin-bottom: 2.5rem;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-weight: 500;
    transition: all var(--transition-base);
}

.contact-link:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: translateY(-2px);
}

.contact-link svg {
    stroke: currentColor;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem var(--container-padding);
    border-top: 1px solid var(--border-color);
}

.footer p {
    font-size: 0.875rem;
    color: var(--text-muted);
    max-width: none;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }
    
    .hero-content {
        order: 1;
    }
    
    .hero-visual {
        order: 2;
    }
    
    .hero-meta {
        justify-content: center;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .about-sidebar {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
    }
    
    .nav-links a:not(.nav-cta) {
        display: none;
    }
    
    .section-title::after {
        display: none;
    }
    
    .strengths-grid,
    .projects-grid,
    .work-grid,
    .looking-grid {
        grid-template-columns: 1fr;
    }
    
    .outcomes-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .terminal {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .contact-links {
        flex-direction: column;
        align-items: center;
    }
    
    .contact-link {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
    
    .outcomes-grid {
        grid-template-columns: 1fr;
    }
}

/* Print Styles */
@media print {
    .grain,
    .nav,
    .hero-visual,
    .hero-actions {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .section {
        padding: 2rem 0;
        page-break-inside: avoid;
    }
    
    h1, h2, h3, h4 {
        color: black;
    }
}