:root {
    --bg-color: #121212;
    --text-color: #ffffff;
    --card-bg: #1e1e1e;
    --card-hover-bg: #2a2a2a;
    --accent-color: #bb86fc;
    --accent-hover: #ffffff;
    --border-color: rgba(255, 255, 255, 0.1);
    --font-primary: 'Poppins', sans-serif;
    --spacing-unit: 1rem;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.8;
    margin: 0;
    padding: 0;
    font-size: 18px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.banner {
    position: relative;
    height: 240px;
    overflow: hidden;
    border-radius: 12px;
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.banner-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease, filter 0.3s ease;
}

.banner-img:hover {
    transform: scale(1.05);
    filter: brightness(1.1);
}

#theme-toggle {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    background-color: var(--card-bg);
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 1000;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease, background-color 0.3s ease;
}

#theme-toggle:hover {
    transform: scale(1.05);
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: calc(var(--spacing-unit) * 3);
}

header {
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 6);
    position: relative;
}

.profile-pic {
    position: absolute;
    top: 180px;
    left: 50%;
    transform: translateX(-50%);
    width: 180px;
    height: 180px;
    border-radius: 50%;
    border: 6px solid var(--bg-color);
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.profile-pic:hover {
    transform: translateX(-50%) scale(1.1);
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
}

header h1 {
    margin-top: calc(var(--spacing-unit) * 6);
    font-size: 3.2rem;
    margin-bottom: var(--spacing-unit);
    font-weight: 600;
    letter-spacing: -0.5px;
}

header p {
    font-size: 1.3rem;
    max-width: 600px;
    margin: 0 auto;
    color: rgba(255, 255, 255, 0.8);
}

section {
    margin-bottom: calc(var(--spacing-unit) * 5);
}

h2 {
    font-size: 2.2rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: var(--spacing-unit);
    margin-top: calc(var(--spacing-unit) * 3);
    margin-bottom: calc(var(--spacing-unit) * 2);
    font-weight: 600;
    letter-spacing: -0.5px;
}

h3 {
    font-size: 1.6rem;
    margin-bottom: var(--spacing-unit);
    font-weight: 500;
    color: var(--accent-color);
}

/* Content card for about section */
.content-card {
    background-color: var(--card-bg);
    border-radius: 16px;
    padding: calc(var(--spacing-unit) * 2);
    margin-top: calc(var(--spacing-unit) * 1.5);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    font-size: 1.1rem;
    line-height: 1.8;
}

.content-card p {
    margin-bottom: var(--spacing-unit);
}

.content-card p:last-child {
    margin-bottom: 0;
}

/* Skills section */
.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: calc(var(--spacing-unit) * 2);
    margin-top: calc(var(--spacing-unit) * 1.5);
}

.skill-category {
    background-color: var(--card-bg);
    border-radius: 16px;
    padding: calc(var(--spacing-unit) * 2);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.skill-list {
    list-style-type: none;
    padding-left: 0;
    margin-top: var(--spacing-unit);
}

.skill-list li {
    padding: calc(var(--spacing-unit) * 0.8) 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 1.1rem;
}

.skill-list li:last-child {
    border-bottom: none;
}

/* Education timeline */
.timeline {
    margin-top: calc(var(--spacing-unit) * 2);
}

.timeline-item {
    background-color: var(--card-bg);
    border-radius: 16px;
    padding: calc(var(--spacing-unit) * 2);
    margin-bottom: calc(var(--spacing-unit) * 2);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.timeline-item:hover {
    transform: translateY(-5px);
}

.timeline-place {
    font-weight: 500;
    margin-bottom: calc(var(--spacing-unit) * 0.5);
    font-size: 1.2rem;
}

.timeline-date {
    color: var(--accent-color);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-unit);
}

.timeline-content p {
    font-size: 1.1rem;
}

/* Link grid styles */
.link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: calc(var(--spacing-unit) * 2);
    margin-top: calc(var(--spacing-unit) * 2);
}

.link-item {
    background-color: var(--card-bg);
    border-radius: 16px;
    padding: calc(var(--spacing-unit) * 2);
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    text-decoration: none;
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.link-item img {
    width: 60px;
    height: 60px;
    border: 1px solid rgb(65, 65, 65);
    border-radius: 10px;
    object-fit: contain;
    vertical-align: middle;
    margin-bottom: var(--spacing-unit);
}

.link-item:hover {
    transform: translateY(-8px);
    background-color: var(--card-hover-bg);
}

.link-item i {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-unit);
    color: var(--accent-color);
    transition: color 0.3s ease;
}

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

.link-item span {
    font-size: 1.2rem;
    font-weight: 500;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

#contact p {
    display: flex;
    align-items: center;
    gap: var(--spacing-unit);
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    font-size: 1.2rem;
}

#contact i {
    font-size: 1.5rem;
    color: var(--accent-color);
}

footer {
    text-align: center;
    margin-top: calc(var(--spacing-unit) * 5);
    padding-top: calc(var(--spacing-unit) * 2);
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.6);
    border-top: 1px solid var(--border-color);
}

.footer-links {
    margin-top: calc(var(--spacing-unit) * 1);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: calc(var(--spacing-unit) * 1);
    flex-wrap: wrap;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

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

.footer-links .separator {
    color: rgba(255, 255, 255, 0.3);
    font-size: 0.9rem;
}

/* Light mode styles */
body.light-mode {
    --bg-color: #ffffff;
    --text-color: #121212;
    --card-bg: #f5f5f7;
    --card-hover-bg: #e8e8e8;
    --accent-color: #5c41a8;
    --accent-hover: #3a2a6b;
    --border-color: rgba(0, 0, 0, 0.1);
}

/* Responsive styles */
@media (max-width: 768px) {
    body {
        font-size: 16px;
    }
    
    .container {
        padding: var(--spacing-unit);
    }

    header h1 {
        font-size: 2.5rem;
    }
    
    header p {
        font-size: 1.1rem;
    }

    h2 {
        font-size: 1.8rem;
    }

    h3 {
        font-size: 1.4rem;
    }

    .link-grid, .skills-container {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
    
    .banner {
        height: 180px;
    }

    .profile-pic {
        top: 120px;
        width: 150px;
        height: 150px;
    }

    header h1 {
        margin-top: calc(var(--spacing-unit) * 5);
    }
}

@media (max-width: 480px) {
    body {
        font-size: 15px;
    }
    
    .profile-pic {
        width: 130px;
        height: 130px;
    }

    .link-grid, .skills-container {
        grid-template-columns: 1fr;
    }
    
    .banner {
        height: 150px;
    }

    .profile-pic {
        top: 100px;
    }

    header h1 {
        margin-top: calc(var(--spacing-unit) * 4.5);
        font-size: 2.2rem;
    }
    
    .timeline-item, .content-card, .skill-category {
        padding: calc(var(--spacing-unit) * 1.5);
    }
    
    #theme-toggle {
        width: 45px;
        height: 45px;
        top: 1rem;
        right: 1rem;
    }
}

/* Animation effects */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

section {
    animation: fadeIn 0.5s ease-out forwards;
}

section:nth-child(1) { animation-delay: 0.1s; }
section:nth-child(2) { animation-delay: 0.2s; }
section:nth-child(3) { animation-delay: 0.3s; }
section:nth-child(4) { animation-delay: 0.4s; }
section:nth-child(5) { animation-delay: 0.5s; }
section:nth-child(6) { animation-delay: 0.6s; }

/* Project items specific styling */
.project-item {
    padding: calc(var(--spacing-unit) * 2.5);
    transition: all 0.4s ease;
}

.project-item i {
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    background: linear-gradient(135deg, var(--accent-color), #9c6ade);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.project-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}