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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding-top: 80px;
    padding-bottom: 20px;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: bold;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 8px 16px;
    border-radius: 20px;
}

.nav-link:hover,
.nav-link.active {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.container {
    max-width: 500px;
    margin: 50px auto;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.header {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 30px;
    text-align: center;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: 10px;
}

.header p {
    opacity: 0.9;
    font-size: 1.1rem;
}

.form-container {
    padding: 30px;
}

.task-nav {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.task-filter {
    flex: 1;
    padding: 12px;
    background: white;
    border: 2px solid #e1e5e9;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.task-filter.active,
.task-filter:hover {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-color: transparent;
}

.input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
}

#todoInput {
    flex: 1;
    padding: 15px 20px;
    border: 2px solid #e1e5e9;
    border-radius: 50px;
    font-size: 1rem;
    outline: none;
    transition: all 0.3s ease;
}

#todoInput:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.add-btn {
    padding: 15px 25px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.add-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.todo-list {
    max-height: 400px;
    overflow-y: auto;
    padding: 0 30px 30px;
}

.todo-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 20px;
    margin-bottom: 15px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    border-left: 4px solid #667eea;
    transition: all 0.3s ease;
    animation: slideIn 0.3s ease;
}

.todo-item:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.todo-item.completed {
    opacity: 0.7;
    border-left-color: #28a745;
}

.todo-item.completed .todo-text {
    text-decoration: line-through;
    color: #999;
}

.todo-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: #667eea;
}

.todo-text {
    flex: 1;
    font-size: 1.1rem;
    color: #333;
    transition: all 0.3s ease;
}

.delete-btn {
    background: linear-gradient(135deg, #ff6b6b, #ee5a52);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 50px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(255, 107, 107, 0.3);
}

.delete-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: #999;
    font-size: 1.1rem;
}

.empty-state::before {
    content: "📝";
    display: block;
    font-size: 3rem;
    margin-bottom: 15px;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.todo-list::-webkit-scrollbar {
    width: 6px;
}

.todo-list::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}

.todo-list::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 10px;
}

.todo-list::-webkit-scrollbar-thumb:hover {
    background: #5a67d8;
}

.about-header {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 40px;
    text-align: center;
    border-radius: 20px 20px 0 0;
}

.profile-img {
    font-size: 4rem;
    margin-bottom: 20px;
}

.about-header h1 {
    font-size: 2.5rem;
    font-weight: 300;
}

.about-content {
    padding: 40px;
}

.info-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.info-card h3 {
    font-size: 2rem;
    color: #333;
    margin-bottom: 5px;
}

.title {
    color: #667eea;
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 25px;
}

.details {
    margin-bottom: 25px;
}

.detail-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid #f0f0f0;
}

.label {
    font-weight: 600;
    color: #555;
}

.value {
    color: #333;
}

.description {
    margin-bottom: 25px;
    line-height: 1.6;
    color: #666;
}

.tech-stack h4 {
    color: #333;
    margin-bottom: 15px;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tech-tag {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}