/* ============================================
   Kelvin Uduma — Portfolio Styles
   Color palette: Deep navy + electric cyan + warm amber accents
   ============================================ */

:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #0f1629;
    --bg-card: #141b2d;
    --bg-card-hover: #1a2340;
    --text-primary: #e8eaf0;
    --text-secondary: #8b93a7;
    --text-muted: #5a6380;
    --accent-primary: #22d3ee;
    --accent-primary-dim: rgba(34, 211, 238, 0.12);
    --accent-secondary: #f59e0b;
    --accent-gradient: linear-gradient(135deg, #22d3ee 0%, #3b82f6 50%, #8b5cf6 100%);
    --border-color: rgba(139, 147, 167, 0.12);
    --border-color-hover: rgba(34, 211, 238, 0.3);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 40px rgba(34, 211, 238, 0.08);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   Navigation
   ============================================ */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background: rgba(10, 14, 26, 0.8);
    border-bottom: 1px solid transparent;
}

.nav.scrolled {
    border-bottom-color: var(--border-color);
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 800;
    text-decoration: none;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition);
    letter-spacing: 0.01em;
}

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

.nav-cta {
    background: var(--accent-primary-dim);
    color: var(--accent-primary) !important;
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(34, 211, 238, 0.2);
}

.nav-cta:hover {
    background: rgba(34, 211, 238, 0.2) !important;
    border-color: rgba(34, 211, 238, 0.4);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    flex-direction: column;
    gap: 5px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-secondary);
    border-radius: 2px;
    transition: var(--transition);
}

/* ============================================
   Hero
   ============================================ */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: 120px 24px 80px;
    overflow: hidden;
}

.hero-bg-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(34, 211, 238, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(34, 211, 238, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 60% 60% at 50% 40%, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 60% 60% at 50% 40%, black 30%, transparent 70%);
}

.hero::before {
    content: '';
    position: absolute;
    top: -200px;
    right: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(34, 211, 238, 0.06) 0%, transparent 70%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -100px;
    left: -100px;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 6px 16px;
    border-radius: 100px;
    margin-bottom: 32px;
    letter-spacing: 0.02em;
    animation: fadeInUp 0.8s ease forwards;
    opacity: 0;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: #10b981;
    border-radius: 50%;
    animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero-greeting {
    display: block;
    font-size: clamp(1rem, 2vw, 1.25rem);
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: 4px;
    animation: fadeInUp 0.8s 0.1s ease forwards;
    opacity: 0;
}

.hero-name {
    display: block;
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.05;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s 0.2s ease forwards;
    opacity: 0;
}

.hero-subtitle {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 16px;
    letter-spacing: -0.01em;
    line-height: 1.3;
    animation: fadeInUp 0.8s 0.3s ease forwards;
    opacity: 0;
}

.hero-description {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-top: 20px;
    line-height: 1.8;
    animation: fadeInUp 0.8s 0.4s ease forwards;
    opacity: 0;
}

.hero-description strong {
    color: var(--accent-primary);
    font-weight: 600;
}

.company-link {
    color: var(--accent-primary);
    font-weight: 600;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.company-link:hover {
    border-bottom-color: var(--accent-primary);
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-top: 36px;
    animation: fadeInUp 0.8s 0.5s ease forwards;
    opacity: 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 14px 28px;
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    letter-spacing: 0.01em;
    font-family: var(--font-sans);
}

.btn-primary {
    background: var(--accent-gradient);
    color: #0a0e1a;
    box-shadow: 0 4px 20px rgba(34, 211, 238, 0.25);
}

.btn-primary:hover {
    box-shadow: 0 8px 32px rgba(34, 211, 238, 0.35);
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    border-color: var(--border-color-hover);
    background: var(--bg-card-hover);
    transform: translateY(-2px);
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 56px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
    animation: fadeInUp 0.8s 0.6s ease forwards;
    opacity: 0;
}

.stat-number {
    display: block;
    font-size: 1.75rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    display: block;
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-top: 2px;
    letter-spacing: 0.02em;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   Sections
   ============================================ */

.section {
    padding: 100px 0;
}

.section-dark {
    background: var(--bg-secondary);
}

.section-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent-primary);
    margin-bottom: 12px;
    font-family: var(--font-mono);
}

.section-title {
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 56px;
}

/* ============================================
   About Section
   ============================================ */

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: start;
}

.about-lead {
    font-size: 1.15rem;
    color: var(--text-primary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-lead strong {
    color: var(--accent-primary);
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 0.95rem;
}

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

.about-text em {
    color: var(--accent-secondary);
    font-style: italic;
}

.about-highlights {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.highlight-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: var(--transition);
}

.highlight-card:hover {
    border-color: var(--border-color-hover);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.highlight-icon {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.highlight-card h3 {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.highlight-card p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   Expertise Section
   ============================================ */

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.expertise-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 36px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.expertise-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-gradient);
    opacity: 0;
    transition: var(--transition);
}

.expertise-card:hover {
    border-color: var(--border-color-hover);
    box-shadow: var(--shadow-glow);
    transform: translateY(-4px);
}

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

.expertise-number {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--accent-primary);
    margin-bottom: 16px;
    opacity: 0.7;
}

.expertise-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.expertise-card p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.expertise-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.expertise-tags span {
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--accent-primary);
    background: var(--accent-primary-dim);
    padding: 4px 12px;
    border-radius: 100px;
    letter-spacing: 0.02em;
}

/* ============================================
   Projects Section
   ============================================ */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
    position: relative;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    border-color: var(--border-color-hover);
    box-shadow: var(--shadow-glow);
    transform: translateY(-4px);
}

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

.project-featured {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, var(--bg-card) 0%, rgba(34, 211, 238, 0.04) 100%);
    border-color: rgba(34, 211, 238, 0.15);
}

.project-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--accent-primary);
    background: var(--accent-primary-dim);
    padding: 4px 12px;
    border-radius: 100px;
    margin-bottom: 16px;
    width: fit-content;
    font-family: var(--font-mono);
    letter-spacing: 0.03em;
}

.project-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: -0.01em;
}

.project-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.7;
    flex: 1;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 20px;
}

.project-tech span {
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-muted);
    background: rgba(139, 147, 167, 0.08);
    padding: 4px 10px;
    border-radius: 100px;
}

.project-arrow {
    position: absolute;
    top: 32px;
    right: 32px;
    font-size: 1.25rem;
    color: var(--text-muted);
    transition: var(--transition);
}

/* ============================================
   Credentials Section
   ============================================ */

.credentials-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.credential-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    transition: var(--transition);
}

.credential-card:hover {
    border-color: var(--border-color-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.credential-logo {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
    font-family: var(--font-mono);
}

.credential-card h3 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.credential-card p {
    font-size: 0.78rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ============================================
   Contact Section
   ============================================ */

.contact-block {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact-description {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 16px;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.contact-link:hover {
    border-color: var(--border-color-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.contact-link-icon {
    font-weight: 800;
    font-size: 1rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ============================================
   Footer
   ============================================ */

.footer {
    padding: 32px 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

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

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 1024px) {
    .expertise-grid { grid-template-columns: 1fr; }
    .credentials-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-toggle { display: flex; }
    
    .hero { padding: 100px 24px 60px; }
    .hero-stats { flex-wrap: wrap; gap: 24px; }
    .stat { flex: 0 0 calc(50% - 12px); }
    
    .about-grid { grid-template-columns: 1fr; gap: 40px; }
    .about-highlights { grid-template-columns: 1fr 1fr; }
    
    .projects-grid { grid-template-columns: 1fr; }
    .project-featured { grid-column: 1; }

    .credentials-grid { grid-template-columns: 1fr 1fr; }
    
    .contact-links { flex-direction: column; align-items: center; }
    
    .section { padding: 72px 0; }
    .hero-actions { flex-direction: column; }
    .btn { text-align: center; justify-content: center; }
}

@media (max-width: 480px) {
    .about-highlights { grid-template-columns: 1fr; }
    .credentials-grid { grid-template-columns: 1fr; }
    .hero-stats { flex-direction: column; gap: 20px; }
    .stat { flex: none; }
}

/* ============================================
   Modals
   ============================================ */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 14, 26, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -45%) scale(0.95);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    width: 90%;
    max-width: 600px;
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.modal.active {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    line-height: 1;
}

.modal-close:hover {
    color: var(--accent-primary);
}

.modal h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.modal p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.modal p strong {
    color: var(--accent-primary);
}

.project-card {
    cursor: pointer;
}