/* ===========================
   CSS Reset & Base Styles
   =========================== */

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

:root {
    /* Colors - Professional palette */
    --primary: #1a365d;
    --primary-light: #2c5282;
    --primary-dark: #0f2942;
    --accent: #d97706;
    --accent-light: #f59e0b;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-light: #718096;
    --bg-primary: #ffffff;
    --bg-secondary: #f7fafc;
    --bg-dark: #1a202c;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===========================
   Typography
   =========================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

p {
    margin-bottom: 1.25rem;
}

.lead {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-secondary);
    line-height: 1.6;
}

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

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 0;
}

.logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

.logo:hover {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    padding: 0.5rem 0;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s ease;
}

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

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

.nav-cta {
    background: var(--primary);
    color: white !important;
    padding: 0.625rem 1.5rem !important;
    border-radius: 6px;
    font-weight: 600;
}

.nav-cta::after {
    display: none;
}

.nav-cta:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

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

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--spacing-xl) 0;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    opacity: 0.05;
    z-index: -1;
}

.hero-content {
    max-width: 900px;
    padding-top: 80px;
}

.hero-label {
    display: inline-block;
    background: var(--accent-light);
    color: white;
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-md);
}

.hero-title {
    font-family: var(--font-display);
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.375rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
    max-width: 800px;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md) 0;
}

.stat {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 2px solid var(--border);
    transition: var(--transition);
}

.stat:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-light);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    font-family: var(--font-display);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* ===========================
   Buttons
   =========================== */

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-size: 1rem;
    text-align: center;
}

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

.btn-primary:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===========================
   Section Styles
   =========================== */

section {
    padding: var(--spacing-xl) 0;
}

.section-header {
    margin-bottom: var(--spacing-lg);
}

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

.section-label {
    display: inline-block;
    color: var(--accent);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-family: var(--font-display);
    color: var(--primary);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

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

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

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.about-text p {
    font-size: 1.0625rem;
    line-height: 1.8;
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.highlight-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: 12px;
    border-left: 4px solid var(--accent);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.highlight-card:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
}

.highlight-card h3 {
    color: var(--primary);
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.highlight-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: 0;
}

/* ===========================
   Capabilities Section
   =========================== */

.capabilities {
    background: white;
}

.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
}

.capability-card {
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 2px solid var(--border);
    transition: var(--transition);
}

.capability-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.capability-icon {
    width: 60px;
    height: 60px;
    background: var(--primary);
    color: white;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
    transition: var(--transition);
}

.capability-card:hover .capability-icon {
    background: var(--accent);
    transform: scale(1.1);
}

.capability-card h3 {
    color: var(--primary);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.capability-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: 0;
}

/* ===========================
   Experience Timeline
   =========================== */

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

.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom, var(--accent), var(--primary));
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.timeline-marker {
    position: absolute;
    left: -2.5rem;
    top: 0.5rem;
    width: 16px;
    height: 16px;
    background: var(--accent);
    border: 4px solid var(--bg-secondary);
    border-radius: 50%;
    box-shadow: 0 0 0 4px var(--accent-light);
}

.timeline-content {
    background: white;
    padding: var(--spacing-md);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.timeline-content:hover {
    box-shadow: var(--shadow-lg);
    transform: translateX(8px);
}

.timeline-date {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 0.375rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.timeline-content h3 {
    color: var(--primary);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.timeline-org {
    color: var(--accent);
    font-weight: 600;
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
}

.timeline-content > p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-size: 1.0625rem;
}

.timeline-highlights {
    list-style: none;
    margin-top: var(--spacing-sm);
}

.timeline-highlights li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.timeline-highlights li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: bold;
}

/* ===========================
   Education Section
   =========================== */

.education {
    background: white;
}

.credentials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.credential-card {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: 12px;
    border: 2px solid var(--border);
    text-align: center;
    transition: var(--transition);
}

.credential-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.credential-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto var(--spacing-sm);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.5rem;
    transition: var(--transition);
}

.credential-icon.cert {
    background: var(--accent);
    color: white;
}

.credential-icon.cert-image {
    background: white;
    padding: 1rem;
    border: 3px solid var(--border);
    box-shadow: var(--shadow-sm);
    border-radius: 16px;
}

.credential-icon.cert-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.credential-icon.degree {
    background: var(--primary);
    color: white;
}

.credential-card:hover .credential-icon {
    transform: scale(1.1) rotate(5deg);
}

.credential-card:hover .credential-icon.cert-image {
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
    transform: scale(1.05);
}

.credential-card h3 {
    color: var(--primary);
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.credential-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.5;
    margin-bottom: 0.75rem;
}

.credential-date {
    display: inline-block;
    background: var(--accent-light);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* ===========================
   Technical Skills Section
   =========================== */

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

.tech-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.tech-category {
    background: white;
    padding: var(--spacing-md);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.tech-category:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.tech-category h3 {
    color: var(--primary);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--accent);
}

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

.tech-tag {
    display: inline-block;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.tech-tag:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-2px);
}

/* ===========================
   Community Involvement Section
   =========================== */

.community {
    background: white;
}

.community-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.community-card {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: 12px;
    border: 2px solid var(--border);
    text-align: center;
    transition: var(--transition);
}

.community-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.community-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-sm);
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.community-card:hover .community-icon {
    background: var(--accent);
    transform: scale(1.1) rotate(5deg);
}

.community-card h3 {
    color: var(--primary);
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.community-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: 0;
}

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

.contact {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.contact .section-label {
    color: var(--accent-light);
}

.contact .section-title {
    color: white;
}

.contact-description {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.125rem;
    line-height: 1.7;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: white;
    text-decoration: none;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.contact-item:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateX(8px);
}

.contact-item svg {
    flex-shrink: 0;
    color: var(--accent-light);
}

.contact-item span {
    font-size: 1.0625rem;
}

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

.footer {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: var(--spacing-md) 0;
    text-align: center;
}

.footer p {
    margin: 0;
    font-size: 0.9375rem;
}

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

@media (max-width: 968px) {
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }

    .timeline {
        padding-left: 1.5rem;
    }

    .timeline-marker {
        left: -1.9rem;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }

    .nav-links {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .hero {
        min-height: auto;
        padding: var(--spacing-lg) 0;
    }

    .hero-content {
        padding-top: 100px;
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .capabilities-grid {
        grid-template-columns: 1fr;
    }

    .credentials-grid {
        grid-template-columns: 1fr;
    }

    .tech-categories {
        grid-template-columns: 1fr;
    }

    .community-grid {
        grid-template-columns: 1fr;
    }

    section {
        padding: var(--spacing-lg) 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .stat-number {
        font-size: 2rem;
    }
}

/* ===========================
   Animations
   =========================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content > * {
    animation: fadeInUp 0.8s ease-out;
}

.hero-label {
    animation-delay: 0.1s;
}

.hero-title {
    animation-delay: 0.2s;
}

.hero-subtitle {
    animation-delay: 0.3s;
}

.hero-stats {
    animation-delay: 0.4s;
}

.hero-cta {
    animation-delay: 0.5s;
}

/* ===========================
   Print Styles
   =========================== */

@media print {
    .nav,
    .hero-cta,
    .contact {
        display: none;
    }

    section {
        page-break-inside: avoid;
    }
}