/* 
   Portfolio: Professional DS/ML Edition
   Theme: The Researcher's Laboratory
   Colors: Dark Mode with Teal/Blue Accents
*/

:root {
    --bg-color: #0a0a0a;
    --card-bg: #111111;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --accent-color: #64ffda;
    /* Teal */
    --accent-dim: rgba(100, 255, 218, 0.1);
    --border-color: #333;
    --font-heading: 'Merriweather', serif;
    --font-body: 'Inter', sans-serif;
    --transition: all 0.3s ease;
}

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

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

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

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Typography */
h1,
h2,
h3 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--text-primary);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 4px;
    background-color: var(--accent-color);
}

/* Navigation */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 50px;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

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

/* Hero Section */
#hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 0 50px;
}

.hero-content {
    max-width: 800px;
    z-index: 2;
    text-align: center;
    /* Centered for impact */
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 20px;
}

.highlight {
    color: var(--accent-color);
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
    font-family: var(--font-body);
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
}

.hero-btns {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.btn {
    padding: 12px 30px;
    border-radius: 4px;
    /* Sharp corners suited for tech */
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    border: 1px solid var(--accent-color);
}

.primary-btn {
    background-color: transparent;
    color: var(--accent-color);
}

.primary-btn:hover {
    background-color: var(--accent-dim);
}

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

.secondary-btn:hover {
    background-color: #4db6ac;
    border-color: #4db6ac;
}

.hero-visual {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    opacity: 0.5;
    pointer-events: none;
}

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

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 50px;
    align-items: center;
}

.about-text p {
    margin-bottom: 20px;
    color: var(--text-secondary);
    font-size: 1rem;
}

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

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 30px;
}

.stat-item {
    border-left: 2px solid var(--accent-color);
    padding-left: 15px;
}

.stat-num {
    display: block;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.about-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.about-image img {
    width: 280px;
    /* Fixed dimensions for perfect circle */
    height: 280px;
    object-fit: cover;
    /* Prevent distortion */
    border-radius: 50%;
    /* Circle */
    border: 3px solid var(--accent-color);
    /* Professional border */
    box-shadow: 0 0 20px rgba(100, 255, 218, 0.2);
    /* Subtle glow */
    filter: grayscale(100%);
    transition: var(--transition);
}

.about-image img:hover {
    filter: grayscale(0%);
    transform: scale(1.05);
    box-shadow: 0 0 30px rgba(100, 255, 218, 0.4);
}

/* Skills Section */
.skills-wrapper {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    /* Force 4 columns for desktop */
    gap: 0;
    /* Remove gap for borders */
    border: 1px solid var(--border-color);
    background: var(--card-bg);
}

.skill-category {
    padding: 30px 20px;
    border-right: 1px solid var(--border-color);
}

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

.skill-category h3 {
    font-size: 1rem;
    margin-bottom: 25px;
    color: var(--accent-color);
    border-bottom: none;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.skill-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.skill-item {
    display: flex;
    align-items: center;
    gap: 15px;
    background: var(--bg-color);
    padding: 15px;
    border-radius: 0;
    /* Square corners */
    border: 1px solid var(--border-color);
    transition: var(--transition);
    font-size: 0.95rem;
    font-weight: 500;
}

.skill-item:hover {
    border-color: var(--accent-color);
    transform: translateX(5px);
    /* Slide instead of lift */
}

.skill-item img,
.skill-item i {
    width: 20px;
    height: 20px;
    object-fit: contain;
    color: var(--accent-color);
}

/* Responsive Skills */
@media (max-width: 1024px) {
    .skills-wrapper {
        grid-template-columns: repeat(2, 1fr);
    }

    .skill-category:nth-child(2) {
        border-right: none;
    }

    .skill-category {
        border-bottom: 1px solid var(--border-color);
    }
}

@media (max-width: 600px) {
    .skills-wrapper {
        grid-template-columns: 1fr;
    }

    .skill-category {
        border-right: none;
    }
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 30px;
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

/* Project Tabs */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    flex-wrap: wrap;
    gap: 20px;
}

.section-title {
    margin-bottom: 0;
    /* Override default */
}

.project-tabs {
    display: flex;
    gap: 10px;
    background: var(--card-bg);
    padding: 5px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 8px 16px;
    cursor: pointer;
    font-family: var(--font-body);
    font-weight: 500;
    border-radius: 4px;
    transition: var(--transition);
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn.active {
    background: var(--accent-dim);
    color: var(--accent-color);
}

/* Tab Views */
.hidden-view {
    display: none;
    opacity: 0;
}

.active-view {
    display: grid;
    animation: fadeIn 0.5s ease forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Badge Colors for Planning/Prototyping */
.status-badge.planning {
    background: rgba(156, 39, 176, 0.2);
    color: #ce93d8;
}

.status-badge.prototyping {
    background: rgba(33, 150, 243, 0.2);
    color: #64b5f6;
}

.project-icon {
    font-size: 2rem;
    color: var(--accent-color);
}

.project-meta h3 {
    font-size: 1.3rem;
    margin-bottom: 5px;
}

.project-tag {
    font-size: 0.75rem;
    font-family: var(--font-body);
    /* Monospace feel */
    color: var(--accent-color);
    margin-right: 10px;
    letter-spacing: 0.5px;
}

.project-body p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.project-body strong {
    color: var(--text-primary);
}

.status-badge {
    font-size: 0.8rem;
    padding: 2px 8px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.1);
}

.status-badge.ongoing {
    background: rgba(255, 193, 7, 0.2);
    color: #ffc107;
}

.project-links {
    margin-top: 20px;
    display: flex;
    gap: 15px;
}

.link-btn {
    font-size: 0.9rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

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

/* Certifications */
.dark-bg {
    background-color: #050505;
}

.cert-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
}

.cert-year {
    color: var(--accent-color);
    font-weight: 700;
    width: 60px;
}

.cert-name {
    flex-grow: 1;
    font-weight: 500;
    color: var(--text-primary);
}

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

/* Contact */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.contact-info p {
    margin-bottom: 30px;
    color: var(--text-secondary);
}

.contact-item {
    font-size: 1.1rem;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.contact-item i {
    color: var(--accent-color);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 15px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    margin-bottom: 15px;
    border-radius: 4px;
    font-family: var(--font-body);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent-color);
}

footer {
    margin-top: 50px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .navbar {
        padding: 20px;
    }

    .nav-links {
        display: none;
        /* Add mobile menu later if needed */
    }

    #hero {
        padding: 0 20px;
    }

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

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

    .about-image {
        order: -1;
        max-width: 300px;
        margin: 0 auto;
    }

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

    .contact-wrapper {
        grid-template-columns: 1fr;
    }
}