/* CSS Variables */
:root {
    --color-bg: #0a0a0b;
    --color-bg-secondary: #111113;
    --color-bg-tertiary: #1a1a1d;
    --color-text: #fafafa;
    --color-text-secondary: #a1a1aa;
    --color-text-muted: #71717a;
    --color-accent: #6366f1;
    --color-accent-light: #818cf8;
    --color-accent-dark: #4f46e5;
    --color-border: #27272a;
    --color-card: #18181b;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

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

html {
    scroll-behavior: smooth;
}

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background-color: rgba(10, 10, 11, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: 12px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-menu a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-menu a:hover {
    color: var(--color-text);
}

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

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

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

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 120px 24px 80px;
    position: relative;
    background: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.15), transparent);
}

.hero-content {
    max-width: 800px;
}

.hero-greeting {
    font-size: 1rem;
    color: var(--color-accent-light);
    font-weight: 500;
    margin-bottom: 16px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.hero-name {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    color: var(--color-accent-light);
    font-weight: 600;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 8px;
    transition: var(--transition);
    cursor: pointer;
}

.btn-primary {
    background: var(--color-accent);
    color: white;
    border: none;
}

.btn-primary:hover {
    background: var(--color-accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -10px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent-light);
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--color-text-muted);
    font-size: 0.8rem;
}

.scroll-indicator {
    width: 24px;
    height: 40px;
    border: 2px solid var(--color-border);
    border-radius: 12px;
    position: relative;
}

.scroll-indicator::after {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--color-accent);
    border-radius: 2px;
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0%, 100% { opacity: 1; top: 8px; }
    50% { opacity: 0.5; top: 20px; }
}

/* Sections */
.section {
    padding: 100px 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
    letter-spacing: -0.02em;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -16px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--color-accent);
    border-radius: 2px;
}

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

.about-content {
    display: grid;
    gap: 60px;
}

.about-text {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-text p {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-text strong {
    color: var(--color-accent-light);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.skill-category {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 32px;
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition);
}

.skill-category.visible {
    opacity: 1;
    transform: translateY(0);
}

.skill-category:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
}

.skill-category h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-accent-light);
    margin-bottom: 20px;
}

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

.skill-category li {
    color: var(--color-text-secondary);
    padding: 8px 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.95rem;
}

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

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

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

.timeline-item {
    position: relative;
    padding-left: 40px;
    padding-bottom: 48px;
    opacity: 0;
    transform: translateX(-20px);
    transition: var(--transition);
}

.timeline-item.visible {
    opacity: 1;
    transform: translateX(0);
}

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

.timeline-marker {
    position: absolute;
    left: -6px;
    top: 0;
    width: 14px;
    height: 14px;
    background: var(--color-bg);
    border: 3px solid var(--color-accent);
    border-radius: 50%;
    z-index: 1;
}

.timeline-content {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 28px;
    transition: var(--transition);
}

.timeline-content:hover {
    border-color: var(--color-accent);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
}

.timeline-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
}

.timeline-header .company {
    color: var(--color-accent-light);
    font-weight: 500;
    margin-top: 4px;
}

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

.timeline-meta .location,
.timeline-meta .date {
    display: block;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.timeline-meta .date {
    color: var(--color-text-secondary);
    margin-top: 4px;
}

.timeline-details {
    list-style: none;
}

.timeline-details li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 12px;
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.timeline-details li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    background: var(--color-accent);
    border-radius: 50%;
}

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

/* Projects Section */
.projects {
    background: var(--color-bg-secondary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 24px;
}

.project-card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 32px;
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition);
}

.project-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.project-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
}

.project-icon {
    width: 56px;
    height: 56px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--color-accent-light);
}

.project-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--color-text);
}

.project-card p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 20px;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.project-tags span {
    background: rgba(99, 102, 241, 0.1);
    color: var(--color-accent-light);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* Education Section */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 24px;
    max-width: 1000px;
    margin: 0 auto;
}

.education-card {
    display: flex;
    gap: 24px;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 32px;
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition);
}

.education-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.education-card:hover {
    border-color: var(--color-accent);
}

.education-logo {
    flex-shrink: 0;
    width: 64px;
    height: 64px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.education-logo span {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-accent-light);
}

.education-details h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 8px;
}

.education-details .institution {
    color: var(--color-accent-light);
    font-weight: 500;
    margin-bottom: 4px;
}

.education-details .location {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.education-details .date {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    margin-top: 8px;
}

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

.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-content > p {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
    margin-bottom: 40px;
    line-height: 1.8;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-card {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 20px 32px;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    text-decoration: none;
    color: var(--color-text);
    transition: var(--transition);
}

.contact-card:hover {
    border-color: var(--color-accent);
    background: rgba(99, 102, 241, 0.05);
}

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

.contact-card span {
    font-size: 1rem;
}

/* Footer */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background: var(--color-bg);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 32px;
        transition: var(--transition);
    }

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

    .nav-menu a {
        font-size: 1.5rem;
    }

    .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 {
        padding: 100px 24px 60px;
    }

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

    .btn {
        width: 100%;
        max-width: 280px;
    }

    .hero-scroll {
        display: none;
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 2rem;
        margin-bottom: 40px;
    }

    .timeline::before {
        left: 6px;
    }

    .timeline-marker {
        left: 0;
    }

    .timeline-item {
        padding-left: 32px;
    }

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

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

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

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

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

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

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-name {
        font-size: 2.25rem;
    }

    .skill-category,
    .project-card,
    .education-card,
    .timeline-content {
        padding: 24px;
    }
}