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

:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-background: #ffffff;
    --color-background-alt: #f9fafb;
    --color-border: #e5e7eb;
    --color-accent: #3b82f6;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    --max-width: 1200px;
    --header-height: 80px;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    --transition: 0.3s ease;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

h1 { font-size: 3rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.25rem; }

p {
    margin-bottom: var(--spacing-sm);
}

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

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

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: white;
}

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

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

/* ===== Header & Navigation ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

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

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-links a {
    color: var(--color-text);
    font-weight: 500;
    position: relative;
}

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

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

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--color-text);
    transition: all var(--transition);
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--header-height);
    background: linear-gradient(135deg, var(--color-background) 0%, var(--color-background-alt) 100%);
}

.hero .container {
    padding-top: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
}

.hero-greeting {
    font-size: 1.125rem;
    color: var(--color-primary);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.hero-name {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: 1.125rem;
    max-width: 600px;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
}

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

/* ===== Sections ===== */
.section {
    padding: var(--spacing-2xl) 0;
}

.section:nth-child(even) {
    background-color: var(--color-background-alt);
}

.section-title {
    font-size: 2rem;
    margin-bottom: var(--spacing-xl);
    text-align: center;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background-color: var(--color-primary);
    margin: var(--spacing-sm) auto 0;
    border-radius: 2px;
}

/* ===== About Section ===== */
.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text p {
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.highlight {
    text-align: center;
}

.highlight-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.highlight-label {
    display: block;
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-top: var(--spacing-xs);
}

/* ===== Experience Section ===== */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--color-border);
}

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

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

.timeline-marker {
    position: absolute;
    left: -5px;
    top: 0;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--color-primary);
    border: 2px solid var(--color-background);
}

.timeline-content {
    background-color: var(--color-background);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.timeline-date {
    display: inline-block;
    font-size: 0.875rem;
    color: var(--color-primary);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.timeline-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

.timeline-company {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

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

.timeline-details li {
    position: relative;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-light);
    font-size: 0.9375rem;
}

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

/* ===== Projects Section ===== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.project-card {
    background-color: var(--color-background);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition), box-shadow var(--transition);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.project-image {
    aspect-ratio: 16 / 10;
    background-color: var(--color-background-alt);
    overflow: hidden;
}

.project-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--color-text-light);
    background: linear-gradient(135deg, var(--color-background-alt) 0%, var(--color-border) 100%);
}

.project-content {
    padding: var(--spacing-md);
}

.project-title {
    margin-bottom: var(--spacing-xs);
}

.project-description {
    color: var(--color-text-light);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-sm);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.8125rem;
    background-color: var(--color-background-alt);
    color: var(--color-primary);
    border-radius: var(--radius-sm);
    font-weight: 500;
}

/* ===== Skills Section ===== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.skill-category {
    background-color: var(--color-background);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.skill-category-title {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.skill-list {
    list-style: none;
}

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

.skill-list li:last-child {
    border-bottom: none;
}

/* ===== Education Section ===== */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

.education-card {
    display: flex;
    gap: var(--spacing-md);
    background-color: var(--color-background);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: transform var(--transition), box-shadow var(--transition);
}

.education-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.education-icon {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: white;
    font-weight: 700;
    font-size: 1.25rem;
    border-radius: var(--radius-md);
}

.education-content {
    flex: 1;
}

.education-degree {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
}

.education-minor {
    font-size: 0.9375rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.education-school {
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 0.25rem;
}

.education-location {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
}

.education-date {
    display: inline-block;
    font-size: 0.8125rem;
    color: var(--color-primary);
    font-weight: 500;
    background-color: var(--color-background-alt);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    margin-top: var(--spacing-xs);
}

/* ===== Project Links ===== */
.project-link {
    display: inline-block;
    margin-top: var(--spacing-sm);
    font-weight: 500;
    font-size: 0.9375rem;
    color: var(--color-primary);
    position: relative;
}

.project-link::after {
    content: ' →';
    transition: transform var(--transition);
    display: inline-block;
}

.project-link:hover::after {
    transform: translateX(4px);
}

/* ===== Contact Section ===== */
.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

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

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.contact-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-background-alt);
    border-radius: var(--radius-md);
    color: var(--color-text);
    transition: all var(--transition);
}

.contact-item:hover {
    background-color: var(--color-primary);
    color: white;
}

.contact-icon {
    font-weight: 700;
    font-size: 1.125rem;
}

.contact-label {
    font-size: 0.9375rem;
}

.contact-cta {
    margin-top: var(--spacing-lg);
}

/* ===== Footer ===== */
.footer {
    background-color: var(--color-text);
    color: var(--color-background);
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.footer p {
    font-size: 0.875rem;
    margin: 0;
    opacity: 0.8;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
    }

    h1 { font-size: 2.25rem; }
    h2 { font-size: 1.75rem; }

    .nav-links {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--color-background);
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
    }

    .nav-links.active {
        display: flex;
    }

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

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

    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }

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

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

    .hero-cta .btn {
        width: 100%;
    }

    .about-highlights {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .timeline::before {
        left: 0;
    }

    .timeline-item {
        padding-left: var(--spacing-lg);
    }

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

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

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

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

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

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

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

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