/* ===== CSS VARIABLES ===== */
:root {
    --primary: #2563EB;
    --primary-dark: #1D4ED8;
    --primary-light: #DBEAFE;
    --dark: #111827;
    --text: #374151;
    --text-light: #6B7280;
    --bg: #FFFFFF;
    --bg-alt: #F9FAFB;
    --border: #E5E7EB;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
    --transition: 0.3s ease;
}

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

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

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

ul {
    list-style: none;
}

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

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== NAVIGATION ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition);
}

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

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark);
    letter-spacing: -0.5px;
}

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

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-light);
    transition: color var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--dark);
}

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--dark);
    transition: all var(--transition);
}

.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 ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 64px;
    background: linear-gradient(135deg, var(--bg) 0%, var(--bg-alt) 50%, var(--primary-light) 100%);
}

.hero-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.hero-greeting {
    font-size: 1.125rem;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 8px;
}

.hero-name {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--dark);
    line-height: 1.1;
    letter-spacing: -1.5px;
    margin-bottom: 12px;
}

.hero-title {
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--text-light);
    margin-bottom: 20px;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text);
    margin-bottom: 32px;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 40px;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 12px 28px;
    border-radius: var(--radius);
    font-size: 0.938rem;
    font-weight: 500;
    transition: all var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.hero-social {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.hero-social a {
    color: var(--text-light);
    transition: all var(--transition);
    display: flex;
    align-items: center;
}

.hero-social a:hover {
    color: var(--primary);
    transform: translateY(-2px);
}

/* ===== SECTIONS ===== */
.section {
    padding: 80px 0;
}

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

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark);
    text-align: center;
    margin-bottom: 48px;
    letter-spacing: -0.5px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 48px;
    height: 3px;
    background: var(--primary);
    margin: 12px auto 0;
    border-radius: 2px;
}

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

.about-text p {
    margin-bottom: 16px;
    font-size: 1.05rem;
    line-height: 1.8;
}

.about-stats {
    display: flex;
    gap: 48px;
    margin-top: 32px;
    justify-content: center;
}

.stat {
    text-align: center;
}

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

.stat-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-light);
    margin-top: 4px;
}

/* ===== TIMELINE ===== */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    padding-left: 32px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: var(--border);
}

.timeline-item {
    position: relative;
    margin-bottom: 32px;
}

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

.timeline-marker {
    position: absolute;
    left: -32px;
    top: 8px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bg);
    border: 3px solid var(--primary);
    z-index: 1;
}

.timeline-item:first-child .timeline-marker {
    background: var(--primary);
}

.timeline-content {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: box-shadow var(--transition);
}

.timeline-content:hover {
    box-shadow: var(--shadow-md);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
    gap: 16px;
}

.timeline-content h3 {
    font-size: 1.125rem;
    color: var(--dark);
    font-weight: 600;
}

.timeline-company {
    font-size: 0.938rem;
    color: var(--text-light);
    margin-top: 2px;
}

.timeline-company a {
    color: var(--primary);
    font-weight: 500;
}

.timeline-date {
    font-size: 0.813rem;
    color: var(--text-light);
    white-space: nowrap;
    background: var(--bg-alt);
    padding: 4px 10px;
    border-radius: 4px;
    font-weight: 500;
}

.timeline-content ul {
    list-style: disc;
    padding-left: 20px;
    margin-bottom: 12px;
}

.timeline-content li {
    font-size: 0.938rem;
    color: var(--text);
    margin-bottom: 4px;
    line-height: 1.6;
}

.timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.timeline-tags span {
    font-size: 0.75rem;
    background: var(--primary-light);
    color: var(--primary-dark);
    padding: 3px 10px;
    border-radius: 100px;
    font-weight: 500;
}

/* ===== SKILLS ===== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.skill-category {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: box-shadow var(--transition);
}

.skill-category:hover {
    box-shadow: var(--shadow-md);
}

.skill-category h3 {
    font-size: 0.938rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.skill-tags span {
    font-size: 0.813rem;
    background: var(--bg);
    color: var(--text);
    padding: 4px 12px;
    border-radius: 100px;
    border: 1px solid var(--border);
    font-weight: 400;
    transition: all var(--transition);
}

.skill-tags span:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

/* ===== PROJECTS ===== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.project-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    transition: all var(--transition);
}

.project-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.project-icon {
    color: var(--primary);
    margin-bottom: 16px;
}

.project-card h3 {
    font-size: 1.25rem;
    color: var(--dark);
    margin-bottom: 12px;
    font-weight: 600;
}

.project-card p {
    font-size: 0.938rem;
    color: var(--text);
    line-height: 1.7;
    margin-bottom: 16px;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.project-tags span {
    font-size: 0.75rem;
    background: var(--primary-light);
    color: var(--primary-dark);
    padding: 3px 10px;
    border-radius: 100px;
    font-weight: 500;
}

/* ===== EDUCATION ===== */
.education-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 800px;
    margin: 0 auto;
}

.education-card {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    text-align: center;
    transition: box-shadow var(--transition);
}

.education-card:hover {
    box-shadow: var(--shadow-md);
}

.education-card h3 {
    font-size: 1.063rem;
    color: var(--dark);
    font-weight: 600;
    margin-bottom: 6px;
}

.education-school {
    font-size: 0.938rem;
    color: var(--text-light);
    margin-bottom: 8px;
}

.education-date {
    font-size: 0.813rem;
    color: var(--text-light);
    background: var(--bg);
    padding: 4px 12px;
    border-radius: 4px;
    font-weight: 500;
}

/* ===== CONTACT ===== */
.contact-intro {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text);
    margin-bottom: 40px;
    margin-top: -16px;
}

.contact-grid {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 24px;
    color: var(--text);
    transition: all var(--transition);
}

.contact-card:hover {
    border-color: var(--primary);
    color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.contact-card svg {
    flex-shrink: 0;
    color: var(--primary);
}

.contact-card span {
    font-size: 0.938rem;
    font-weight: 500;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--dark);
    color: #9CA3AF;
    padding: 32px 0;
    text-align: center;
}

.footer-social {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 16px;
}

.footer-social a {
    color: #9CA3AF;
    transition: all var(--transition);
    display: flex;
}

.footer-social a:hover {
    color: #fff;
    transform: translateY(-2px);
}

.footer-text {
    font-size: 0.813rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--bg);
        flex-direction: column;
        align-items: center;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
        transform: translateY(-120%);
        transition: transform var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
    }

    .hero-name {
        font-size: 2.5rem;
    }

    .hero-title {
        font-size: 1.25rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .about-stats {
        gap: 24px;
    }

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

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

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

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

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

    .section {
        padding: 60px 0;
    }
}

@media (max-width: 480px) {
    .skills-grid {
        grid-template-columns: 1fr;
    }

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

    .section-title {
        font-size: 1.5rem;
    }

    .about-stats {
        flex-direction: column;
        gap: 16px;
    }

    .contact-grid {
        flex-direction: column;
        align-items: center;
    }
}