/* ================================================
   Design System & CSS Variables
   ================================================ */

:root {
    /* Colors - Light Theme (SaaS Professional) */
    --color-bg: #ffffff;
    --color-bg-light: #f9fafb;
    --color-bg-primary-light: #eef2ff;
    
    --color-primary: #4f46e5;
    --color-primary-hover: #4338ca;
    
    --color-text-primary: #111827;
    --color-text-secondary: #4b5563;
    --color-text-muted: #6b7280;
    
    --color-border: #e5e7eb;
    --color-border-hover: #d1d5db;
    
    /* Typography */
    --font-primary: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 5rem;
    
    /* Layout */
    --container-width: 1024px;
    --navbar-height: 72px;
    
    /* Effects */
    --shadow-sm: 0 1px 2px 0 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);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition: 200ms ease-in-out;
}

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

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

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

body {
    font-family: var(--font-primary);
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

p {
    color: var(--color-text-secondary);
}

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

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

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: var(--space-2xl) 0;
}

.bg-light {
    background-color: var(--color-bg-light);
}

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

/* ================================================
   Typography & Utilities
   ================================================ */

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

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    background-color: var(--color-bg-primary-light);
    color: var(--color-primary);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-md);
}

.badge::before {
    content: "";
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--color-primary);
    margin-right: 0.5rem;
}

.section-header {
    margin-bottom: var(--space-xl);
    max-width: 600px;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 0.5rem;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-muted);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition);
    cursor: pointer;
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    color: white;
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    border-color: var(--color-border-hover);
    background-color: var(--color-bg-light);
    color: var(--color-text-primary);
}

.btn-nav {
    padding: 0.5rem 1rem;
    background-color: var(--color-bg-light);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-weight: 500;
}

.btn-nav:hover {
    background-color: var(--color-border);
    color: var(--color-text-primary);
}

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

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    height: var(--navbar-height);
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-border);
    z-index: 50;
    display: flex;
    align-items: center;
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.025em;
}

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

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.nav-link:hover, .nav-link.active {
    color: var(--color-text-primary);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--color-text-primary);
    cursor: pointer;
    padding: 0.5rem;
}

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

.hero {
    min-height: calc(100vh - var(--navbar-height));
    display: flex;
    align-items: center;
    padding-top: var(--space-xl);
    padding-bottom: var(--space-xl);
}

.hero-content {
    max-width: 700px;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.1;
    margin-bottom: var(--space-md);
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.25rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    max-width: 600px;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ================================================
   Resume Actions Section
   ================================================ */

.resume-actions-section {
    padding-bottom: var(--space-xl);
}

.resume-actions-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
    background-color: var(--color-bg-primary-light);
    padding: var(--space-lg) var(--space-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.resume-actions-text h2 {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
    color: var(--color-primary);
}

.resume-actions-text p {
    font-size: 0.9375rem;
    margin: 0;
}

.resume-actions-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.resume-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.about-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

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

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.stat-card {
    background: white;
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: 0.25rem;
}

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

/* ================================================
   Experience Section (Timeline)
   ================================================ */

.timeline {
    position: relative;
    max-width: 800px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--color-border);
}

.timeline-item {
    position: relative;
    padding-left: 2.5rem;
    margin-bottom: var(--space-lg);
}

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

.timeline-dot {
    position: absolute;
    left: 0;
    top: 0.375rem;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: white;
    border: 3px solid var(--color-primary);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.role {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

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

.duration {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    background-color: var(--color-bg-light);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}

.responsibilities {
    list-style-type: disc;
    padding-left: 1.25rem;
    color: var(--color-text-secondary);
}

.responsibilities li {
    margin-bottom: 0.5rem;
}

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

.projects-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.project-card {
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
}

.project-title {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.project-description {
    font-size: 1rem;
    margin-bottom: 1.25rem;
    flex-grow: 1;
}

.project-highlights {
    list-style: none;
    margin: 0 0 1.25rem 0;
    padding: 0;
    flex-grow: 1;
}

.project-highlights li {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    padding-left: 1.5rem;
    position: relative;
}

.project-highlights li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tech-tag {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-primary);
    background-color: var(--color-bg-primary-light);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
}

.project-links {
    display: flex;
    gap: 1.25rem;
}

.project-link {
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
}

.project-link::after {
    content: "→";
    margin-left: 0.25rem;
    transition: transform var(--transition);
}

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

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

.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
}

.skill-group-title {
    font-size: 1.125rem;
    margin-bottom: var(--space-sm);
    color: var(--color-text-primary);
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

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

.skill-tags .tag {
    background-color: white;
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
}

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

.contact-container {
    text-align: center;
    max-width: 600px;
}

.contact-title {
    font-size: 2.5rem;
    margin-bottom: var(--space-sm);
}

.contact-text {
    font-size: 1.125rem;
    margin-bottom: var(--space-lg);
}

.contact-links {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.social-links {
    display: flex;
    gap: var(--space-md);
}

.social-link {
    font-weight: 500;
    color: var(--color-text-secondary);
}

.social-link:hover {
    color: var(--color-primary);
}

/* Improved contact card layout */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: var(--space-lg);
    align-items: start;
}

.contact-card {
    background: white;
    border: 1px solid var(--color-border);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    text-align: left;
}

.contact-item {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.contact-icon {
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background-color: var(--color-bg-primary-light);
    color: var(--color-primary);
    flex-shrink: 0;
}

.contact-meta .contact-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.contact-meta .contact-value {
    font-weight: 600;
    color: var(--color-text-primary);
}

.contact-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 0.25rem;
}

.contact-social {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
    flex-wrap: wrap;
}

.contact-text-muted {
    color: var(--color-text-muted);
    margin-top: 0.5rem;
}

/* Small screens: stack card below text */
@media (max-width: 900px) {
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .contact-card {
        width: 100%;
    }
}

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

.footer {
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--color-border);
    background-color: white;
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.footer-mark {
    flex-shrink: 0;
}

.footer-copy {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
}

.footer-copyright {
    font-size: 0.875rem;
    margin: 0;
}

.footer-note {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin: 0;
}

.back-to-top {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

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

@media (max-width: 768px) {
    :root {
        --space-2xl: 4rem;
        --space-xl: 2.5rem;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        background-color: white;
        flex-direction: column;
        padding: var(--space-md);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
        gap: 1rem;
    }

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

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

    .btn-nav {
        width: 100%;
        text-align: center;
    }

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

    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .timeline-header {
        flex-direction: column;
    }
}