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

/* Light Theme (default) - Pastel Ocean Blue */
:root, [data-theme="light"] {
    --primary: #0891b2;
    --primary-light: #22d3ee;
    --primary-dark: #0e7490;
    --bg-primary: #f0f9ff;
    --bg-secondary: #e0f2fe;
    --bg-card: #ffffff;
    --text-primary: #0c4a6e;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --accent: #06b6d4;
    --border: rgba(8, 145, 178, 0.15);
    --shadow: rgba(8, 145, 178, 0.1);
}

/* Dark Theme */
[data-theme="dark"] {
    --primary: #22d3ee;
    --primary-light: #67e8f9;
    --primary-dark: #0891b2;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #334155;
    --text-primary: #f0f9ff;
    --text-secondary: #e0f2fe;
    --text-muted: #94a3b8;
    --accent: #06b6d4;
    --border: rgba(34, 211, 238, 0.2);
    --shadow: rgba(0, 0, 0, 0.3);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: var(--bg-primary);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    box-shadow: 0 4px 20px var(--shadow);
}

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

.nav-links {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.nav-controls {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

/* Theme Toggle Button */
.theme-btn {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
    padding: 0.5rem;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-btn:hover {
    background: var(--primary);
    color: var(--bg-primary);
}

[data-theme="light"] .moon-icon,
[data-theme="dark"] .sun-icon {
    display: none;
}

[data-theme="light"] .sun-icon,
[data-theme="dark"] .moon-icon {
    display: block;
}

/* Language Toggle */
.lang-btn {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.lang-btn:hover {
    background: var(--primary);
    color: var(--bg-primary);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 100px 2rem 2rem;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    position: relative;
}

.hero-greeting {
    font-size: 1.5rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    font-weight: 400;
}

.hero-name {
    font-size: 5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

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

.hero-roles {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.role {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--accent);
}

.role-divider {
    color: var(--text-muted);
    font-weight: 300;
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2rem;
    background: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px var(--shadow);
}

.cta-button:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px var(--shadow);
}

.cta-button.secondary {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
    box-shadow: none;
}

.cta-button.secondary:hover {
    background: var(--primary);
    color: white;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.85rem;
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid var(--primary);
    border-bottom: 2px solid var(--primary);
    transform: rotate(45deg);
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(10px); }
}

/* Sections */
section {
    padding: 6rem 0;
}

section h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    color: var(--text-primary);
    position: relative;
}

section h2::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    margin: 1rem auto 0;
    border-radius: 2px;
}

/* Parallax Sections */
.parallax-section {
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}

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

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-text .lead {
    font-size: 1.4rem;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.about-text p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.about-details {
    display: flex;
    justify-content: center;
    gap: 4rem;
    margin-top: 3rem;
    flex-wrap: wrap;
}

.detail {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-card);
    border-radius: 16px;
    box-shadow: 0 4px 20px var(--shadow);
    min-width: 150px;
}

.detail-number {
    display: block;
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.detail-label {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 0.5rem;
    display: block;
}

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

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 2rem;
    border: 1px solid var(--border);
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px var(--shadow);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px var(--shadow);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.project-header h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.project-date {
    color: var(--text-muted);
    font-size: 0.9rem;
    background: var(--bg-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
}

.project-role {
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.project-scope {
    color: var(--accent);
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.project-details {
    list-style: none;
    padding: 0;
}

.project-details li {
    color: var(--text-secondary);
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

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

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

.skills-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.skill-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 20px;
    border: 1px solid var(--border);
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px var(--shadow);
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px var(--shadow);
}

.skill-icon {
    color: var(--primary);
    margin-bottom: 1.5rem;
}

.skill-card h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.skill-card p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.skill-card ul {
    list-style: none;
    padding: 0;
}

.skill-card li {
    color: var(--text-secondary);
    padding: 0.4rem 0;
    padding-left: 1.25rem;
    position: relative;
    font-size: 0.9rem;
}

.skill-card li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: bold;
}

/* Tools & Certs */
.tools-certs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: 2rem;
    background: var(--bg-card);
    border-radius: 20px;
    box-shadow: 0 4px 20px var(--shadow);
}

.tools-certs h3 {
    color: var(--accent);
    margin-bottom: 1rem;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.tag {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

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

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

/* Experience Timeline - Alternating */
.experience {
    background: var(--bg-primary);
}

.timeline-alt {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
}

.timeline-alt::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--primary), var(--primary-light));
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    width: 50%;
    padding: 1rem 2rem;
}

.timeline-item.left {
    left: 0;
    padding-right: 3rem;
}

.timeline-item.right {
    left: 50%;
    padding-left: 3rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    top: 1.5rem;
    width: 16px;
    height: 16px;
    background: var(--primary);
    border: 4px solid var(--bg-primary);
    border-radius: 50%;
    z-index: 1;
}

.timeline-item.left::before {
    right: -8px;
}

.timeline-item.right::before {
    left: -8px;
}

.timeline-content {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 16px;
    box-shadow: 0 4px 20px var(--shadow);
    border: 1px solid var(--border);
}

.timeline-date {
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

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

.timeline-content .company {
    color: var(--accent);
    margin-bottom: 1rem;
    font-weight: 500;
}

.timeline-content ul {
    list-style: none;
    padding: 0;
}

.timeline-content li {
    color: var(--text-secondary);
    padding: 0.3rem 0;
    padding-left: 1.25rem;
    position: relative;
    font-size: 0.9rem;
}

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

/* Education Section */
.education-section {
    margin-top: 4rem;
    text-align: center;
}

.education-section h3 {
    color: var(--text-primary);
    margin-bottom: 2rem;
    font-size: 1.5rem;
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.education-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    border: 1px solid var(--border);
    box-shadow: 0 4px 20px var(--shadow);
}

.education-card h4 {
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.education-card .school {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.education-card p {
    color: var(--text-muted);
}

/* Hobbies Section */
.hobbies {
    background: var(--bg-secondary);
}

.hobbies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.hobby-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 2rem;
    background: var(--bg-card);
    border-radius: 20px;
    border: 1px solid var(--border);
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px var(--shadow);
}

.hobby-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px var(--shadow);
}

.hobby-item:hover .hobby-icon {
    color: var(--primary-light);
    transform: scale(1.1);
}

.hobby-icon {
    color: var(--primary);
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}

.hobby-item span {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1rem;
}

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

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 2rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.contact-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: 12px;
    color: var(--primary);
    flex-shrink: 0;
}

.contact-text {
    display: flex;
    flex-direction: column;
}

.contact-label {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.contact-text a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-form input,
.contact-form textarea {
    padding: 1rem 1.25rem;
    border: 2px solid var(--border);
    border-radius: 12px;
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--shadow);
}

.contact-form button {
    padding: 1rem 2rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.contact-form button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    padding: 2rem;
    text-align: center;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
}

/* Responsive */
@media (max-width: 900px) {
    .timeline-alt::before {
        left: 0;
    }

    .timeline-item {
        width: 100%;
        padding-left: 2rem;
        padding-right: 0;
    }

    .timeline-item.left,
    .timeline-item.right {
        left: 0;
        padding-left: 2.5rem;
        padding-right: 0;
    }

    .timeline-item::before,
    .timeline-item.left::before,
    .timeline-item.right::before {
        left: -8px;
        right: auto;
    }
}

@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    .nav-links {
        gap: 0.75rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero {
        padding-top: 150px;
    }

    .hero-name {
        font-size: 3rem;
    }

    .hero-roles {
        flex-direction: column;
        gap: 0.5rem;
    }

    .role-divider {
        display: none;
    }

    .role {
        font-size: 1.2rem;
    }

    section {
        padding: 4rem 0;
    }

    .about-details {
        gap: 1.5rem;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

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

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

/* 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);
}

/* Smooth transitions for theme switch */
*, *::before, *::after {
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}