/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
    --color-bg: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-tertiary: #1a1a25;
    --color-text: #e4e4e7;
    --color-text-muted: #a1a1aa;
    --color-primary: #60a5fa;
    --color-primary-dark: #3b82f6;
    --color-secondary: #a78bfa;
    --color-accent: #34d399;
    --color-border: #27272a;
    --color-card: #18181b;

    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'Fira Code', 'Consolas', monospace;

    --transition: all 0.3s ease;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.4);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    overflow-x: hidden;
}

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

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

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

ul {
    list-style: none;
}

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

.section {
    padding: 100px 0;
}

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

.section-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: 2px;
}

.icon {
    width: 20px;
    height: 20px;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

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

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

.nav-menu a {
    color: var(--color-text);
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

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

.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: 25px;
    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 60px;
    background:
        radial-gradient(ellipse at 50% 0%, rgba(96, 165, 250, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 50%, rgba(167, 139, 250, 0.1) 0%, transparent 40%),
        var(--color-bg);
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(96, 165, 250, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(96, 165, 250, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero-greeting {
    color: var(--color-primary);
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 16px;
    font-family: var(--font-mono);
}

.hero-name {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    margin-bottom: 16px;
    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: clamp(1.5rem, 4vw, 2rem);
    font-weight: 600;
    color: var(--color-secondary);
    margin-bottom: 20px;
}

.hero-subtitle {
    color: var(--color-text-muted);
    font-size: 1.1rem;
    margin-bottom: 24px;
    font-family: var(--font-mono);
}

.hero-location {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--color-text-muted);
    margin-bottom: 40px;
}

.hero-location .icon {
    width: 18px;
    height: 18px;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn .icon {
    width: 20px;
    height: 20px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    box-shadow: 0 4px 15px rgba(96, 165, 250, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(96, 165, 250, 0.5);
    color: white;
}

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

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

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.hero-scroll a {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

.hero-scroll .icon {
    width: 24px;
    height: 24px;
}

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

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

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

.about-text {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

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

.about-tagline {
    font-size: 1.3rem;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 40px;
    font-style: italic;
}

.contact-info {
    display: flex;
    gap: 32px;
    justify-content: center;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--color-text);
    padding: 12px 24px;
    background: var(--color-bg-tertiary);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

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

.contact-item .icon {
    width: 22px;
    height: 22px;
}

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

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

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

.timeline-item {
    position: relative;
    padding-left: 40px;
    margin-bottom: 50px;
}

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

.timeline-marker {
    position: absolute;
    left: -6px;
    top: 0;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--color-primary);
    box-shadow: 0 0 20px rgba(96, 165, 250, 0.5);
}

.timeline-content {
    background: var(--color-card);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.timeline-content:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 8px;
}

.timeline-header h3 {
    font-size: 1.3rem;
    color: var(--color-text);
}

.timeline-period {
    color: var(--color-primary);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    white-space: nowrap;
}

.timeline-company {
    color: var(--color-secondary);
    margin-bottom: 16px;
    font-size: 1rem;
}

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

.timeline-details li {
    color: var(--color-text-muted);
    margin-bottom: 12px;
    padding-left: 20px;
    position: relative;
}

.timeline-details li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

/* ============================================
   Skills Section
   ============================================ */
.skills {
    background: var(--color-bg-secondary);
}

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

.skill-category {
    background: var(--color-card);
    padding: 28px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.skill-category:hover {
    border-color: var(--color-primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.skill-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 20px;
    color: var(--color-primary);
}

.skill-icon svg {
    width: 100%;
    height: 100%;
}

.skill-category h3 {
    font-size: 1.2rem;
    margin-bottom: 12px;
    color: var(--color-text);
}

.skill-category p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

/* ============================================
   Certifications Section
   ============================================ */
.certifications {
    background: var(--color-bg);
}

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

.cert-card {
    background: var(--color-card);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    transition: var(--transition);
    text-align: center;
}

.cert-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.cert-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 20px;
    color: var(--color-accent);
}

.cert-icon svg {
    width: 100%;
    height: 100%;
}

.cert-card h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--color-text);
}

.cert-issuer {
    color: var(--color-primary);
    font-size: 0.95rem;
    margin-bottom: 8px;
}

.cert-status {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-family: var(--font-mono);
}

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

.education-card {
    display: flex;
    align-items: center;
    gap: 30px;
    background: var(--color-card);
    padding: 40px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    max-width: 800px;
    margin: 0 auto;
}

.education-icon {
    width: 64px;
    height: 64px;
    color: var(--color-secondary);
    flex-shrink: 0;
}

.education-icon svg {
    width: 100%;
    height: 100%;
}

.education-content h3 {
    font-size: 1.4rem;
    color: var(--color-text);
    margin-bottom: 8px;
}

.education-school {
    color: var(--color-primary);
    margin-bottom: 4px;
}

.education-period {
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    font-size: 0.95rem;
}

/* ============================================
   Languages Section
   ============================================ */
.languages {
    background: var(--color-bg);
}

.languages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.language-card {
    background: var(--color-card);
    padding: 24px 30px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.language-card:hover {
    border-color: var(--color-secondary);
}

.language-name {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-text);
    display: block;
    margin-bottom: 4px;
}

.language-level {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    display: block;
    margin-bottom: 12px;
}

.language-bar {
    height: 6px;
    background: var(--color-bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
}

.language-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: 3px;
    transition: width 1s ease;
}

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

.contact-description {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 50px;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.contact-card {
    background: var(--color-card);
    padding: 35px 25px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    text-align: center;
    transition: var(--transition);
}

.contact-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.contact-card-icon {
    width: 50px;
    height: 50px;
    margin: 0 auto 20px;
    color: var(--color-primary);
}

.contact-card-icon svg {
    width: 100%;
    height: 100%;
}

.contact-card h3 {
    font-size: 1.2rem;
    color: var(--color-text);
    margin-bottom: 8px;
}

.contact-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

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

.footer p {
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.footer-tagline {
    color: var(--color-primary);
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--color-bg-secondary);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
        border-bottom: 1px solid var(--color-border);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-toggle {
        display: flex;
    }

    .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(7px, -6px);
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 2rem;
    }

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

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

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

    .timeline-period {
        white-space: normal;
    }

    .education-card {
        flex-direction: column;
        text-align: center;
        padding: 30px;
    }

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

@media (max-width: 480px) {
    .hero-name {
        font-size: 2rem;
    }

    .hero-title {
        font-size: 1.3rem;
    }

    .hero-subtitle {
        font-size: 0.95rem;
    }

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