/* --- Global Variables & Theme Controls --- */
:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #6366f1 100%);
    --card-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.3);
    --border-color: #334155;
    --font-family: 'Inter', sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Mode Variables Override */
[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --accent-color: #2563eb;
    --accent-gradient: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);
    --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.08);
    --border-color: #e2e8f0;
}

/* --- Base Layout Styles --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-family);
    line-height: 1.6;
    transition: var(--transition);
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

a {
    color: inherit;
    text-decoration: none;
}

/* --- Navigation --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

[data-theme="light"] .navbar {
    background-color: rgba(248, 250, 252, 0.9);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.2rem 5%;
}

.nav-logo {
    font-size: 1.4rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    align-items: center;
    list-style: none;
}

.nav-link {
    margin: 0 1.2rem;
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

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

.theme-btn {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1.1rem;
    margin-left: 1.5rem;
    transition: var(--transition);
}

.theme-btn:hover {
    color: var(--accent-color);
    transform: rotate(15deg);
}

/* --- Hamburger Menu --- */
.menu-toggle {
    display: none;
    cursor: pointer;
}

.menu-toggle .bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    background-color: var(--text-primary);
    transition: var(--transition);
}

/* --- Hero Section --- */
.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    padding-top: 100px;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.21fr 0.8fr;
    gap: 4rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 5%;
    align-items: center;
}

.hero-subtitle {
    display: inline-block;
    color: var(--accent-color);
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 0.8rem;
    font-size: 0.9rem;
}

.hero-title {
    font-size: 3.2rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.hero-role {
    font-size: 1.5rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.hero-description {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 2rem;
    max-width: 600px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    font-weight: 600;
    border-radius: 8px;
    transition: var(--transition);
    cursor: pointer;
    font-size: 0.95rem;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #ffffff;
    border: none;
    margin-right: 1rem;
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    border: 1.5px solid var(--border-color);
    color: var(--text-primary);
}

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

/* Stat Cards */
.hero-stats-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.stat-item {
    border-left: 4px solid var(--accent-color);
    padding-left: 1.5rem;
}

.stat-number {
    display: block;
    font-size: 2.2rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* --- Sections --- */
.section {
    padding: 6.5rem 0;
}

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

.section-title {
    font-size: 2.2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3.5rem;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--accent-gradient);
    margin: 10px auto 0;
    border-radius: 2px;
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: center;
}

.about-info p {
    color: var(--text-secondary);
    margin-bottom: 1.2rem;
    font-size: 1.05rem;
}

.key-achievements {
    margin-top: 2rem;
}

.key-achievements h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.key-achievements ul {
    list-style: none;
}

.key-achievements li {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 0.8rem;
    color: var(--text-secondary);
}

.key-achievements li i {
    color: var(--accent-color);
}

.about-quick-details {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.detail-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.detail-card:hover {
    transform: translateY(-3px);
}

.detail-icon {
    font-size: 1.8rem;
    color: var(--accent-color);
}

.detail-card h4 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-transform: uppercase;
}

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

.timeline::after {
    content: '';
    position: absolute;
    width: 2px;
    background-color: var(--border-color);
    top: 0;
    bottom: 0;
    left: 20px;
}

.timeline-item {
    position: relative;
    padding-left: 55px;
    margin-bottom: 3rem;
}

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

.timeline-dot {
    position: absolute;
    width: 16px;
    height: 16px;
    background: var(--accent-gradient);
    border-radius: 50%;
    left: 13px;
    top: 5px;
    z-index: 10;
}

.timeline-date {
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 0.4rem;
}

.timeline-content {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--card-shadow);
}

.timeline-content h3 {
    font-size: 1.4rem;
    margin-bottom: 0.2rem;
}

.timeline-company {
    display: block;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

.timeline-summary {
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.timeline-details {
    list-style: none;
    padding-left: 0.5rem;
}

.timeline-details li {
    position: relative;
    padding-left: 1.2rem;
    margin-bottom: 0.6rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

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

/* Skills Competencies */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.skill-category {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2.2rem;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.skill-category:hover {
    transform: translateY(-5px);
}

.category-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.category-header i {
    font-size: 1.6rem;
    color: var(--accent-color);
}

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

.skill-list li {
    padding: 0.6rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-size: 0.95rem;
}

[data-theme="light"] .skill-list li {
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

/* Education and Certifications */
.edu-train-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.subsection-title {
    font-size: 1.4rem;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.subsection-title i {
    color: var(--accent-color);
}

.edu-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 1.8rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.edu-card:hover {
    transform: scale(1.01);
}

.edu-date {
    color: var(--accent-color);
    font-weight: 600;
    font-size: 0.85rem;
}

.edu-card h4 {
    font-size: 1.15rem;
    margin: 0.4rem 0;
}

.school {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Contact Form */
.contact-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.contact-wrapper {
    max-width: 600px;
    margin: 0 auto;
}

.contact-form-container {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: var(--card-shadow);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    outline: none;
    font-family: var(--font-family);
    transition: var(--transition);
}

.form-group input:focus, .form-group textarea:focus {
    border-color: var(--accent-color);
}

.btn-block {
    width: 100%;
}

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 2.5rem 0;
    text-align: center;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

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

.social-links {
    display: flex;
    gap: 1.5rem;
}

.social-links a {
    color: var(--text-secondary);
    font-size: 1.2rem;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--accent-color);
}


/* --- Responsive Media Queries --- */
@media (max-width: 992px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    .about-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    .edu-train-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--bg-secondary);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
        padding: 2rem 0;
    }
    .nav-menu.active {
        left: 0;
    }
    .nav-link {
        margin: 1.5rem 0;
        display: block;
    }
    .theme-btn {
        margin-left: 0;
        margin-top: 1rem;
    }
    .hero-title {
        font-size: 2.5rem;
    }
    .timeline::after {
        left: 20px;
    }
    .footer-content {
        flex-direction: column;
    }
}