:root {
    --bg-color: #0a0a0a;
    --text-color: #e5e5e5;
    --text-muted: #a3a3a3;
    --primary-color: #3b82f6;
    /* A nice accessible blue */
    --primary-hover: #2563eb;
    --accent-color: #8b5cf6;
    /* Purple for gradients */
    --card-bg: #171717;
    --border-color: #262626;
    --header-bg: rgba(10, 10, 10, 0.8);
    --header-border-color: rgba(255, 255, 255, 0.05);

    /* Light Mode Variables (Override these in .light-mode) */
    --bg-color-light: #f2f2f2;
    /* 5% black */
    --text-color-light: #1a1a1a;
    --text-muted-light: #525252;
    --card-bg-light: #ffffff;
    --border-color-light: #e5e5e5;
    --header-bg-light: rgba(242, 242, 242, 0.8);
    --header-border-color-light: rgba(0, 0, 0, 0.1);

    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;

    --container-width: 1200px;
    --header-height: 80px;

    --transition-base: 0.3s ease;
}

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

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

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

body.light-mode {
    --bg-color: var(--bg-color-light);
    --text-color: var(--text-color-light);
    --text-muted: var(--text-muted-light);
    --card-bg: var(--card-bg-light);
    --border-color: var(--border-color-light);
    --header-bg: var(--header-bg-light);
    --header-border-color: var(--header-border-color-light);
}

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

ul {
    list-style: none;
}

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

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    line-height: 1.2;
    font-weight: 700;
}

.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: var(--primary-color);
    border-radius: 2px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-outline {
    border-color: var(--border-color);
    background: transparent;
    color: var(--text-color);
}

.btn-outline:hover {
    border-color: var(--text-color);
    background: rgba(255, 255, 255, 0.05);
}

/* Header */
.header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--header-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--header-border-color);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.nav-list {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--text-muted);
    font-weight: 500;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-color);
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    transition: color var(--transition-base);
}

.theme-toggle:hover {
    color: var(--primary-color);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 6px;
}

.bar {
    width: 24px;
    height: 2px;
    background-color: var(--text-color);
    transition: 0.3s;
}

/* Hero */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: var(--header-height);
}

.hero-title {
    font-size: clamp(3rem, 8vw, 6rem);
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
}

.hero-title span {
    display: block;
}

.highlight {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 600px;
    margin-bottom: 2.5rem;
}

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

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

/* About */
.about-grid {
    display: grid;
    gap: 4rem;
}

.about-content p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: var(--text-muted);
}

.skills-wrapper {
    margin-top: 2rem;
}

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1rem;
}

.skill-tag {
    padding: 0.5rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.9rem;
    color: var(--text-muted);
    transition: 0.3s;
}

.skill-tag:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Timeline */
.timeline {
    position: relative;
    border-left: 2px solid var(--border-color);
    margin-left: 1rem;
    padding-left: 2rem;
}

.timeline-item {
    margin-bottom: 3rem;
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2.6rem;
    top: 0.5rem;
    width: 1rem;
    height: 1rem;
    background: var(--bg-color);
    border: 2px solid var(--primary-color);
    border-radius: 50%;
}

.timeline-date {
    font-size: 0.9rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    display: block;
    font-weight: 500;
}

.timeline-title {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.timeline-company {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.timeline-description {
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

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

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    transition: 0.3s;
    display: flex;
    flex-direction: column;
}

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

.project-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.project-desc {
    color: var(--text-muted);
    margin-bottom: auto;
    /* Pushes footer down */
}

.project-tags {
    margin-top: 1.5rem;
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    font-size: 0.8rem;
}

.project-links {
    margin-top: 1.5rem;
    display: flex;
    gap: 1rem;
}

.link-icon {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

.project-btn {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* Contact */
.contact-container {
    text-align: center;
    max-width: 800px;
}

.contact-text {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.big-btn {
    font-size: 1.5rem;
    padding: 1rem 2rem;
}

.social-links {
    margin-top: 3rem;
    display: flex;
    justify-content: center;
    gap: 2rem;
}

.social-links a {
    color: var(--text-muted);
    font-size: 1.8rem;
    transition: var(--transition-base);
}

.social-links a:hover {
    color: var(--primary-color);
    transform: translateY(-3px);
}

/* Footer */
.footer {
    padding: 2rem 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 768px) {
    .header-container {
        padding: 0 1.5rem;
    }

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

    .nav-list {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        height: 0;
        background: var(--bg-color);
        flex-direction: column;
        gap: 0;
        overflow: hidden;
        transition: height 0.3s ease;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-list.active {
        height: auto;
        padding-bottom: 1rem;
        border-bottom: 1px solid var(--primary-color);
    }

    .nav-list li {
        width: 100%;
        text-align: center;
    }

    .nav-link {
        display: block;
        padding: 1.5rem;
        font-size: 1.2rem;
    }

    .mobile-menu-btn {
        display: flex;
        z-index: 1001;
    }

    .mobile-menu-btn.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .mobile-menu-btn.active .bar:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-btn.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
}

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

.testimonial-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.testimonial-content p {
    font-style: italic;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.testimonial-author {
    display: flex;
    flex-direction: column;
}

.author-name {
    font-size: 1.1rem;
    color: var(--text-color);
    margin-bottom: 0.2rem;
}

.author-role {
    font-size: 0.9rem;
    color: var(--primary-color);
}

/* Logo Image */
.logo-link {
    display: flex;
    align-items: center;
}

.logo-img {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    border: 2px solid var(--primary-color);
    object-fit: cover;
    transition: transform var(--transition-base);
}

.logo-img:hover {
    transform: scale(1.1);
}

/* Things I Can Do List */
.skills-intro {
    margin-bottom: 2rem !important;
    /* Override default paragraph styles */
    font-style: italic;
    border-left: 3px solid var(--primary-color);
    padding-left: 1rem;
}

.things-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.things-list li {
    background: var(--card-bg);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    transition: var(--transition-base);
}

.things-list li::before {
    content: '✓';
    color: var(--primary-color);
    font-weight: bold;
    margin-right: 10px;
}

/* Certifications */
.certifications-wrapper {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.cert-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.cert-list li a {
    display: block;
    background: var(--card-bg);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition-base);
}

.cert-list li a:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

/* Articles */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.article-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    text-decoration: none;
    color: var(--text-color);
    transition: var(--transition-base);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 180px;
}

.article-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.article-title {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.article-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: auto;
}

.article-platform {
    font-size: 0.8rem;
    color: var(--primary-color);
    margin-top: 1rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}