:root {
    --bg-color: #ffffff;
    --text-color: #333333;
    --accent-color: #4a90e2;
    --card-bg: #f5f5f5;
    --nav-bg: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --nav-icon-size: 24px;
    --border-radius: 15px;
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --text-color: #ffffff;
    --accent-color: #64b5f6;
    --card-bg: #2d2d2d;
    --nav-bg: #333333;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Arial', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color 0.3s ease;
}

.card-container {
    width: 90%;
    max-width: 1200px;
    height: 80vh;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    display: flex;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.side-nav {
    width: 80px;
    background: var(--nav-bg);
    padding: 2rem 1rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    border-right: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
}

.nav-items {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    align-items: center;
    position: relative;
}

.nav-item {
    position: relative;
    text-decoration: none;
    color: var(--text-color);
    font-size: var(--nav-icon-size);
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    background: var(--nav-bg);
}

.nav-item i {
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.nav-item::before {
    content: '';
    position: absolute;
    bottom: -8px;
    width: 5px;
    height: 5px;
    background: var(--accent-color);
    border-radius: 50%;
    opacity: 0;
    transform: scale(0);
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.nav-item.active::before {
    opacity: 1;
    transform: auto;
}

.nav-item:hover {
    transform: scale(1.2);
}

.nav-item.active {
    color: var(--accent-color);
}

.nav-item .tooltip {
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%) translateX(10px);
    background: var(--nav-bg);
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 14px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: var(--shadow);
}

.nav-item:hover .tooltip {
    opacity: 1;
    transform: translateY(-50%) translateX(15px);
}

/* Update responsive styles */
@media (max-width: 768px) {
    .nav-item:hover {
        transform: scale(1.2) translateY(-5px);
    }

    .nav-item .tooltip {
        top: -45px;
        left: 50%;
        transform: translateX(-50%) translateY(0);
    }

    .nav-item:hover .tooltip {
        transform: translateX(-50%) translateY(-5px);
    }

    .nav-item::before {
        bottom: -5px;
    }
}

.nav-item::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: var(--accent-color);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s ease, height 0.6s ease;
    z-index: -1;
}

.nav-item:hover::before,
.nav-item.active::before {
    width: 100%;
    height: 100%;
    opacity: 0.2;
}

.nav-item .tooltip {
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%);
    background: var(--nav-bg);
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 14px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
    margin-left: 10px;
    box-shadow: var(--shadow);
}

.nav-item:hover .tooltip {
    opacity: 1;
    transform: translateY(-50%) translateX(5px);
}

.theme-toggle {
    width: 50px;
    height: 50px;
    position: relative;
    cursor: pointer;
    border-radius: 50%;
    background: var(--card-bg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.toggle-button {
    width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toggle-button i {
    position: absolute;
    font-size: 20px;
    transition: transform 0.6s ease, opacity 0.3s ease;
}

.toggle-button .fa-sun {
    opacity: 1;
    transform: rotate(0deg);
}

.toggle-button .fa-moon {
    opacity: 0;
    transform: rotate(-90deg);
}

[data-theme="dark"] .toggle-button .fa-sun {
    opacity: 0;
    transform: rotate(90deg);
}

[data-theme="dark"] .toggle-button .fa-moon {
    opacity: 1;
    transform: rotate(0deg);
}

.main-content {
    flex: 1;
    padding: 2rem;
    position: relative;
    overflow-y: auto;
}

.section {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
    padding: 2rem;
    display: none;
}

.section.active {
    opacity: 1;
    transform: translateY(0);
    display: block;
}

/* Hero Section */
.hero-content {
    text-align: center;
    padding: 2rem;
}

.profile-image {
    width: 200px;
    height: 200px;
    margin: 0 auto 2rem;
    position: relative;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: var(--shadow);
}

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

.social-links {
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.social-icon {
    color: var(--text-color);
    font-size: 24px;
    transition: transform 0.3s ease;
}

.social-icon:hover {
    transform: translateY(-3px);
    color: var(--accent-color);
}

/* About Section */
.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.skills {
    margin-top: 2rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1rem;
}

.skill-tag {
    background: var(--accent-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
}

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

.project-card {
    background: var(--nav-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.project-card:hover {
    transform: translateY(-5px);
}

.project-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.project-card h3 {
    padding: 1rem;
}

.project-card p {
    padding: 0 1rem 1rem;
    color: var(--text-color);
    opacity: 0.8;
}

.project-links {
    padding: 1rem;
    display: flex;
    gap: 1rem;
}

.project-link {
    text-decoration: none;
    color: var(--accent-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Contact Section */
.contact-container {
    max-width: 800px;
    margin: 0 auto;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2rem;
    margin-top: 2rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.contact-item i {
    font-size: 24px;
    color: var(--accent-color);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    position: relative;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    background: var(--nav-bg);
    border: none;
    border-radius: var(--border-radius);
    color: var(--text-color);
    font-size: 1rem;
}

.form-group textarea {
    height: 150px;
    resize: none;
}

.submit-btn {
    background: var(--accent-color);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: transform 0.3s ease;
}

.submit-btn:hover {
    transform: translateY(-2px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .card-container {
        flex-direction: column;
        height: auto;
        min-height: 100vh;
    }

    .side-nav {
        width: 100%;
        height: 70px;
        padding: 1rem;
        flex-direction: row;
    }

    .nav-items {
        flex-direction: row;
        gap: 1rem;
    }

    .nav-item .tooltip {
        top: -40px;
        left: 50%;
        transform: translateX(-50%);
        margin-left: 0;
    }

    .nav-item:hover .tooltip {
        transform: translateX(-50%) translateY(-5px);
    }

    .main-content {
        height: calc(100vh - 70px);
    }

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