/* ===========================
   CSS Variables & Reset
   =========================== */
:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #3b82f6;
    --color-accent: #06b6d4;
    --color-bg: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-card: #1e293b;
    --color-text: #e2e8f0;
    --color-text-muted: #94a3b8;
    --color-text-heading: #f1f5f9;
    --color-border: #334155;
    --color-success: #10b981;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.5);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-main);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

/* ===========================
   Utility Classes
   =========================== */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 5rem 0;
}

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

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: 3rem;
    text-align: center;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    margin: 0.75rem auto 0;
    border-radius: 2px;
}

/* ===========================
   Buttons
   =========================== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
}

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

.btn-secondary:hover {
    background: var(--color-primary-light);
    color: white;
    transform: translateY(-2px);
}

/* ===========================
   Navigation
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: 0.75rem 0;
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary-light);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

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

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary-light);
    transition: width 0.3s ease;
}

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

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-text);
    font-size: 1.25rem;
    cursor: pointer;
}

/* ===========================
   Hero Section
   =========================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 6rem 2rem 2rem;
    position: relative;
    overflow: hidden;
    background: radial-gradient(ellipse at 20% 50%, rgba(37, 99, 235, 0.08) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 50%, rgba(6, 182, 212, 0.06) 0%, transparent 60%);
}

.hero-container {
    max-width: 1100px;
    width: 100%;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 4rem;
}

.hero-greeting {
    font-size: 1.1rem;
    color: var(--color-accent);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.hero-name {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--color-text-heading);
    line-height: 1.1;
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
}

.hero-title {
    font-size: 1.75rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1.25rem;
}

.hero-description {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    max-width: 500px;
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.hero-socials {
    display: flex;
    gap: 1.25rem;
}

.hero-socials a {
    color: var(--color-text-muted);
    font-size: 1.35rem;
    transition: var(--transition);
}

.hero-socials a:hover {
    color: var(--color-primary-light);
    transform: translateY(-3px);
}

/* Hero Graphic Animation */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-graphic {
    position: relative;
    width: 320px;
    height: 320px;
}

.cloud-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 4rem;
    color: var(--color-primary-light);
    z-index: 2;
    animation: pulse 3s ease-in-out infinite;
}

.orbit {
    position: absolute;
    top: 50%;
    left: 50%;
    border: 1px dashed var(--color-border);
    border-radius: 50%;
    animation: spin 20s linear infinite;
}

.orbit-1 {
    width: 180px;
    height: 180px;
    margin-top: -90px;
    margin-left: -90px;
    animation-duration: 15s;
}

.orbit-2 {
    width: 260px;
    height: 260px;
    margin-top: -130px;
    margin-left: -130px;
    animation-duration: 20s;
    animation-direction: reverse;
}

.orbit-3 {
    width: 320px;
    height: 320px;
    margin-top: -160px;
    margin-left: -160px;
    animation-duration: 25s;
}

.orbit-dot {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 28px;
    height: 28px;
    background: var(--color-bg-card);
    border: 2px solid var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    color: var(--color-primary-light);
}

.orbit-dot i {
    animation: counter-spin 20s linear infinite;
}

.orbit-1 .orbit-dot i { animation-duration: 15s; }
.orbit-2 .orbit-dot i { animation-duration: 20s; animation-direction: reverse; }
.orbit-3 .orbit-dot i { animation-duration: 25s; }

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes counter-spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(-360deg); }
}

@keyframes pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
    50% { transform: translate(-50%, -50%) scale(1.1); opacity: 0.8; }
}

/* Visitor Counter */
.visitor-counter {
    position: absolute;
    bottom: 2rem;
    right: 2rem;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.visitor-counter i {
    color: var(--color-accent);
}

#visitor-count {
    color: var(--color-accent);
    font-weight: 600;
}

/* ===========================
   Timeline (Experience)
   =========================== */
.timeline {
    position: relative;
    padding-left: 2rem;
}

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

.timeline-item {
    position: relative;
    margin-bottom: 2.5rem;
    padding-left: 1.5rem;
}

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

.timeline-marker {
    position: absolute;
    left: -2.35rem;
    top: 0.5rem;
    width: 12px;
    height: 12px;
    background: var(--color-primary);
    border-radius: 50%;
    border: 3px solid var(--color-bg);
    z-index: 1;
}

.timeline-content {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    transition: var(--transition);
}

.timeline-content:hover {
    border-color: var(--color-primary);
    box-shadow: 0 0 20px rgba(37, 99, 235, 0.1);
}

.timeline-header h3 {
    font-size: 1.15rem;
    color: var(--color-text-heading);
    margin-bottom: 0.25rem;
}

.timeline-company {
    color: var(--color-primary-light);
    font-weight: 500;
    font-size: 0.95rem;
}

.timeline-date {
    display: block;
    color: var(--color-text-muted);
    font-size: 0.85rem;
    margin-bottom: 0.75rem;
}

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

.timeline-details li {
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: 0.4rem;
    color: var(--color-text-muted);
    font-size: 0.92rem;
}

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

/* ===========================
   Skills Grid
   =========================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.skill-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    transition: var(--transition);
}

.skill-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.15);
}

.skill-icon {
    font-size: 2rem;
    color: var(--color-primary-light);
    margin-bottom: 0.75rem;
}

.skill-card h3 {
    color: var(--color-text-heading);
    font-size: 1.05rem;
    margin-bottom: 0.75rem;
}

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

.tag {
    background: rgba(37, 99, 235, 0.12);
    color: var(--color-primary-light);
    padding: 0.25rem 0.65rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid rgba(37, 99, 235, 0.2);
}

/* ===========================
   Certifications
   =========================== */
.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.cert-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
    display: block;
    cursor: pointer;
}

.cert-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(6, 182, 212, 0.15);
}

.cert-badge {
    font-size: 2.5rem;
    color: var(--color-accent);
    margin-bottom: 1rem;
}

.cert-card h3 {
    color: var(--color-text-heading);
    font-size: 1.05rem;
    margin-bottom: 0.5rem;
}

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

.cert-date {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    margin-top: 0.25rem;
}

/* ===========================
   Education
   =========================== */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    justify-items: center;
}

.edu-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 2rem;
    text-align: center;
    max-width: 450px;
    width: 100%;
    transition: var(--transition);
}

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

.edu-icon {
    font-size: 2.5rem;
    color: var(--color-primary-light);
    margin-bottom: 1rem;
}

.edu-card h3 {
    color: var(--color-text-heading);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.edu-school {
    color: var(--color-primary-light);
    font-weight: 500;
}

.edu-date {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    margin-top: 0.25rem;
}

/* ===========================
   Projects
   =========================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.75rem;
    transition: var(--transition);
}

.project-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.15);
}

.project-icon {
    font-size: 2rem;
    color: var(--color-primary-light);
    margin-bottom: 1rem;
}

.project-card h3 {
    color: #ffffff;
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.project-card h3 a {
    color: #ffffff;
    text-decoration: none;
    transition: var(--transition);
}

.project-card h3 a:hover {
    color: var(--color-primary-light);
    text-decoration: underline;
}

.project-card p {
    color: #cbd5e1;
    font-size: 0.92rem;
    margin-bottom: 1rem;
    line-height: 1.7;
}

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

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

.contact-text {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-text);
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    width: fit-content;
}

.contact-item:hover {
    border-color: var(--color-primary);
    background: rgba(37, 99, 235, 0.08);
    color: var(--color-primary-light);
}

.contact-item i {
    font-size: 1.2rem;
    color: var(--color-primary-light);
}

/* ===========================
   Footer
   =========================== */
.footer {
    text-align: center;
    padding: 2rem 0;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

.footer-note {
    margin-top: 0.5rem;
    font-size: 0.8rem;
}

.footer-note a {
    color: var(--color-primary-light);
    text-decoration: none;
}

.footer-note a:hover {
    text-decoration: underline;
}

/* ===========================
   Animations
   =========================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(15, 23, 42, 0.98);
        flex-direction: column;
        padding: 1rem 2rem;
        gap: 0.75rem;
        border-bottom: 1px solid var(--color-border);
    }

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

    .nav-toggle {
        display: block;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

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

    .hero-title {
        font-size: 1.35rem;
    }

    .hero-description {
        margin: 0 auto 2rem;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-socials {
        justify-content: center;
    }

    .hero-visual {
        order: -1;
    }

    .hero-graphic {
        width: 240px;
        height: 240px;
    }

    .orbit-3 {
        width: 240px;
        height: 240px;
        margin-top: -120px;
        margin-left: -120px;
    }

    .visitor-counter {
        position: relative;
        bottom: auto;
        right: auto;
        margin-top: 2rem;
        justify-content: center;
    }

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

    .timeline {
        padding-left: 1.5rem;
    }
}

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

    .section {
        padding: 3rem 0;
    }

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