/* ========================================
   CSS Variables & Reset
======================================== */
:root {
    /* Colors - Professional navy/slate palette */
    --color-primary: #1e3a5f;
    --color-primary-light: #2d4a6f;
    --color-primary-dark: #0f2847;
    --color-accent: #3b82f6;
    --color-accent-light: #60a5fa;
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-text-muted: #9ca3af;
    --color-background: #ffffff;
    --color-background-alt: #f9fafb;
    --color-background-dark: #111827;
    --color-border: #e5e7eb;
    --color-success: #10b981;

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

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Border radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;
}

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

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

body {
    font-family: var(--font-primary);
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

/* ========================================
   Layout
======================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-4xl) 0;
}

/* ========================================
   Navigation
======================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: transparent;
    transition: background-color var(--transition-normal), box-shadow var(--transition-normal);
}

.nav.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-background);
    transition: color var(--transition-fast);
}

.nav.scrolled .nav-logo {
    color: var(--color-primary);
}

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

.nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
    transition: color var(--transition-fast);
    position: relative;
}

.nav.scrolled .nav-link {
    color: var(--color-text);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-fast);
}

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

.nav-cta {
    background-color: var(--color-accent);
    color: white !important;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

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

.nav-cta:hover {
    background-color: var(--color-accent-light);
    transform: translateY(-2px);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background-color: white;
    transition: background-color var(--transition-fast);
}

.nav.scrolled .nav-toggle span {
    background-color: var(--color-text);
}

/* ========================================
   Hero Section
======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-4xl) var(--spacing-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-eyebrow {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent-light);
    margin-bottom: var(--spacing-md);
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    color: white;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 1.25rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-lg);
}

.hero-description {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
    margin-bottom: var(--spacing-xl);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
}

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

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

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
}

.stat {
    text-align: center;
    padding: var(--spacing-xl);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

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

.stat-suffix {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent-light);
}

.stat-label {
    display: block;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
    margin-top: var(--spacing-sm);
}

.hero-scroll {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.hero-scroll a {
    color: rgba(255, 255, 255, 0.6);
    transition: color var(--transition-fast);
}

.hero-scroll a:hover {
    color: white;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* ========================================
   Section Headers
======================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-eyebrow {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--color-text);
}

/* ========================================
   About Section
======================================== */
.about {
    background-color: var(--color-background);
}

.about-lead {
    font-size: 1.25rem;
    color: var(--color-text-light);
    line-height: 1.8;
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-3xl);
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
}

.highlight {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    background-color: var(--color-background-alt);
    border-radius: var(--radius-lg);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.highlight:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.highlight-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    border-radius: var(--radius-md);
    color: white;
}

.highlight-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.highlight-content p {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    line-height: 1.6;
}

/* ========================================
   Experience Section
======================================== */
.experience {
    background-color: var(--color-background-alt);
}

.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-accent), var(--color-primary));
}

.timeline-item {
    position: relative;
    padding-left: 60px;
    padding-bottom: var(--spacing-3xl);
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: 12px;
    top: 0;
    width: 18px;
    height: 18px;
    background-color: var(--color-background);
    border: 3px solid var(--color-accent);
    border-radius: 50%;
    z-index: 1;
}

.timeline-content {
    background-color: var(--color-background);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.timeline-content:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.timeline-company h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

.timeline-industry {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.timeline-meta {
    text-align: right;
}

.timeline-role {
    display: block;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-primary);
}

.timeline-date {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.timeline-description {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.timeline-achievements {
    margin-bottom: var(--spacing-lg);
}

.achievement-category {
    margin-bottom: var(--spacing-md);
}

.achievement-category h4 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.achievement-category ul {
    list-style: none;
}

.achievement-category li {
    position: relative;
    padding-left: var(--spacing-lg);
    font-size: 0.9375rem;
    color: var(--color-text-light);
    line-height: 1.6;
    margin-bottom: var(--spacing-xs);
}

.achievement-category li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 6px;
    height: 6px;
    background-color: var(--color-success);
    border-radius: 50%;
}

.timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.tag {
    font-size: 0.75rem;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--color-background-alt);
    color: var(--color-text-light);
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
}

/* ========================================
   Competencies Section
======================================== */
.competencies {
    background-color: var(--color-background);
}

.competencies-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.competency-card {
    padding: var(--spacing-xl);
    background-color: var(--color-background-alt);
    border-radius: var(--radius-lg);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.competency-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.competency-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    border-radius: var(--radius-md);
    color: white;
    margin-bottom: var(--spacing-lg);
}

.competency-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.competency-card ul {
    list-style: none;
}

.competency-card li {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--color-border);
}

.competency-card li:last-child {
    border-bottom: none;
}

/* ========================================
   Achievements Section
======================================== */
.achievements {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    color: white;
}

.achievements .section-eyebrow {
    color: var(--color-accent-light);
}

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

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.achievement-card {
    text-align: center;
    padding: var(--spacing-xl);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: transform var(--transition-normal), background-color var(--transition-normal);
}

.achievement-card:hover {
    transform: translateY(-4px);
    background: rgba(255, 255, 255, 0.15);
}

.achievement-value {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-accent-light);
    margin-bottom: var(--spacing-xs);
}

.achievement-label {
    font-size: 1rem;
    font-weight: 600;
    color: white;
    margin-bottom: var(--spacing-md);
}

.achievement-card p {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

/* ========================================
   Education Section
======================================== */
.education {
    background-color: var(--color-background-alt);
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.education-card {
    text-align: center;
    padding: var(--spacing-xl);
    background-color: var(--color-background);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.education-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.education-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    border-radius: 50%;
    color: white;
    margin: 0 auto var(--spacing-lg);
}

.education-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.education-field {
    font-size: 0.9375rem;
    color: var(--color-accent);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.education-institution {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* ========================================
   Contact Section
======================================== */
.contact {
    background-color: var(--color-background);
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
}

.contact-intro {
    text-align: center;
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-3xl);
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.contact-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    background-color: var(--color-background-alt);
    border-radius: var(--radius-lg);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.contact-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.contact-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    border-radius: var(--radius-md);
    color: white;
}

.contact-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
}

.contact-value {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text);
}

/* ========================================
   Footer
======================================== */
.footer {
    background-color: var(--color-background-dark);
    color: rgba(255, 255, 255, 0.6);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.footer p {
    font-size: 0.875rem;
}

/* ========================================
   Animations
======================================== */
[data-aos] {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

[data-aos="zoom-in"] {
    transform: scale(0.95);
}

[data-aos="zoom-in"].aos-animate {
    transform: scale(1);
}

/* ========================================
   Responsive Design
======================================== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-stats {
        max-width: 500px;
        margin: 0 auto;
    }

    .competencies-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .achievements-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .education-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        font-size: 15px;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background-color: var(--color-background);
        flex-direction: column;
        justify-content: center;
        gap: var(--spacing-xl);
        transition: right var(--transition-normal);
        box-shadow: var(--shadow-xl);
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-menu .nav-link {
        color: var(--color-text);
        font-size: 1.125rem;
    }

    .nav-toggle {
        display: flex;
        z-index: 1001;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .hero-stats {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-md);
    }

    .stat {
        padding: var(--spacing-lg);
    }

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

    .about-highlights {
        grid-template-columns: 1fr;
    }

    .timeline::before {
        left: 15px;
    }

    .timeline-item {
        padding-left: 45px;
    }

    .timeline-marker {
        left: 8px;
        width: 16px;
        height: 16px;
    }

    .timeline-header {
        flex-direction: column;
    }

    .timeline-meta {
        text-align: left;
    }

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

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

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

    .contact-methods {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .section {
        padding: var(--spacing-3xl) 0;
    }

    .hero-stats {
        grid-template-columns: 1fr;
    }

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

    .btn {
        width: 100%;
    }

    .highlight {
        flex-direction: column;
        text-align: center;
    }

    .highlight-icon {
        margin: 0 auto;
    }
}

/* ========================================
   Print Styles
======================================== */
@media print {
    .nav,
    .hero-scroll,
    .hero-cta {
        display: none;
    }

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

    .section {
        padding: var(--spacing-xl) 0;
        page-break-inside: avoid;
    }
}