:root {
    /* Light Mode Variables */
    --bg-color: #fbfbfd;
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --card-bg: #ffffff;
    --border-color: rgba(0, 0, 0, 0.08);
    --accent-color: #0071e3;
    --accent-hover: #0077ed;
    --nav-bg: rgba(251, 251, 253, 0.8);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
}

[data-theme="dark"] {
    /* Dark Mode Variables */
    --bg-color: #000000;
    --text-primary: #f5f5f7;
    --text-secondary: #a1a1a6;
    --card-bg: #1c1c1e;
    --border-color: rgba(255, 255, 255, 0.1);
    --accent-color: #2997ff;
    --accent-hover: #147ce6;
    --nav-bg: rgba(0, 0, 0, 0.8);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s;
}

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

/* Typography */
h1,
h2,
h3,
h4 {
    letter-spacing: -0.02em;
    font-weight: 600;
}

h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.text-secondary {
    color: var(--text-secondary);
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--nav-bg);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.nav-content {
    max-width: 1000px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: -0.05em;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

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

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

#theme-toggle {
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    transition: background-color 0.2s;
}

#theme-toggle:hover {
    background-color: var(--border-color);
}

#theme-toggle svg {
    width: 20px;
    height: 20px;
}

/* Layout */
main {
    max-width: 1000px;
    margin: 0 auto;
    padding: 6rem 2rem 2rem;
}

.section {
    padding: 4rem 0;
}

/* Hero Section */
.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 70vh;
    gap: 4rem;
}

.hero-content {
    flex: 1;
}

.title {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 1rem;
    font-weight: 700;
    letter-spacing: -0.04em;
}

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

.hero-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 600px;
}

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

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 980px;
    /* pill shape */
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.primary-btn {
    background-color: var(--accent-color);
    color: white !important;
    border: none;
}

.primary-btn:hover {
    background-color: var(--accent-hover);
    color: white !important;
    transform: scale(1.02);
}

.secondary-btn {
    background-color: transparent;
    color: var(--text-primary) !important;
    border: 1px solid var(--border-color);
}

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

.hero-image-container {
    flex: 1;
    display: flex;
    justify-content: flex-end;
}

.profile-placeholder {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--border-color) 0%, var(--card-bg) 100%);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border: 1px solid var(--border-color);
}

.profile-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-placeholder.no-image::after {
    content: "Add photo to img/profile.jpg";
}

/* Cards */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 18px;
    padding: 2rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease, border-color 0.3s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

/* Timeline / Experience */
.timeline {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.timeline-item {
    display: flex;
    gap: 2rem;
}

.timeline-date {
    width: 150px;
    flex-shrink: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    padding-top: 0.5rem;
}

.timeline-content {
    flex: 1;
}

.timeline-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

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

.task-list {
    list-style-type: none;
}

.task-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.task-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

/* Education */
.edu-card {
    display: flex;
    flex-direction: column;
}

.edu-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 0.5rem;
}

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

.gpa {
    color: var(--text-secondary);
    margin-top: 1rem;
}

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

.project-card {
    padding: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.project-media {
    height: 200px;
    background-color: var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    position: relative;
    overflow: hidden;
}

/* If a project has an image/video, they will fill the container */
.project-media img,
.project-media video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.project-info {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.project-meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.project-info h3 {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.project-course {
    color: var(--accent-color);
    font-weight: 500;
    font-size: 0.9rem;
    margin-top: -0.5rem;
    margin-bottom: 1rem;
}

.project-info p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    flex: 1;
    text-align: justify;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tech-tag {
    background-color: var(--border-color);
    color: var(--text-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 99px;
    font-size: 0.75rem;
    font-weight: 500;
}

.text-link {
    font-weight: 500;
    font-size: 0.9rem;
}

/* Skills Section */
.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.skill-category h3 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    color: var(--text-primary);
}

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

.skill-tags span {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: transform 0.2s, background-color 0.2s;
}

.skill-tags span:hover {
    transform: translateY(-2px);
    background-color: var(--border-color);
    color: var(--text-primary);
}

/* Additional grid */
.grid-2-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.info-box h3 {
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.info-box p {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.info-box p strong {
    color: var(--text-primary);
}

/* Footer */
footer {
    border-top: 1px solid var(--border-color);
    padding: 3rem 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 4rem;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Project Jump Links & Highlights */
.project-jump-link {
    color: var(--text-primary);
    text-decoration: underline;
    text-decoration-color: transparent;
    transition: text-decoration-color 0.2s, color 0.2s;
    cursor: pointer;
}

.project-jump-link:hover {
    color: var(--accent-color);
    text-decoration-color: var(--accent-color);
}

@keyframes highlightPulse {
    0% {
        border-color: var(--accent-color);
        box-shadow: 0 0 15px var(--accent-color);
        transform: scale(1.01);
    }

    100% {
        border-color: var(--border-color);
        box-shadow: var(--shadow);
        transform: scale(1);
    }
}

.project-card.highlight {
    animation: highlightPulse 1.5s ease-out;
}

/* Hamburger Menu (hidden on desktop) */
.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

.hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--text-primary);
    margin: 5px 0;
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.hamburger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Responsive */
@media (max-width: 768px) {
    .hamburger {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        max-width: 300px;
        height: 100vh;
        background-color: var(--card-bg);
        flex-direction: column;
        align-items: flex-start;
        padding: 5rem 2rem 2rem;
        gap: 0.25rem;
        border-left: 1px solid var(--border-color);
        transition: right 0.3s ease;
        box-shadow: -4px 0 15px rgba(0, 0, 0, 0.1);
        z-index: 1000;
    }

    .nav-links.open {
        right: 0;
    }

    .nav-links a {
        font-size: 1.1rem;
        padding: 0.75rem 0;
        width: 100%;
    }

    #theme-toggle {
        margin-top: 1rem;
    }

    .hero {
        flex-direction: column-reverse;
        text-align: center;
        gap: 2rem;
        padding-top: 2rem;
        min-height: auto;
    }

    .title {
        font-size: 2.5rem;
    }

    .subtitle {
        font-size: 1.15rem;
    }

    .hero-text {
        margin: 0 auto 2rem;
        font-size: 0.95rem;
    }

    .hero-actions {
        justify-content: center;
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    .btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.9rem;
    }

    .profile-placeholder {
        width: 200px;
        height: 200px;
    }

    .timeline-item {
        flex-direction: column;
        gap: 0.5rem;
    }

    .timeline-date {
        width: auto;
        padding-top: 0;
    }

    .grid-2-col {
        grid-template-columns: 1fr;
    }

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