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

body {
    font-family: 'Segoe UI', Tahoma, sans-serif;
    background: linear-gradient(to bottom, #e6f2ff, #ffffff);
    color: #333;
}

header {
    position: sticky;
    top: 0;
    backdrop-filter: blur(10px);
    background: rgba(51, 153, 255, 0.85);
    color: white;
    padding: 15px;
    text-align: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    z-index: 1000;
}

header h1 {
    margin-bottom: 10px;
}

nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
    gap: 20px;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    padding: 8px 15px;
    border-radius: 20px;
    transition: 0.3s;
}

nav a:hover {
    background: white;
    color: #3399ff;
}

section {
    padding: 60px 20px;
    text-align: center;
}

article {
    background: white;
    margin: 20px auto;
    padding: 20px;
    border-radius: 15px;
    max-width: 900px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

article:hover {
    transform: translateY(-5px);
}

h2 {
    margin-bottom: 20px;
    color: #3399ff;
    font-size: 28px;
}

h3 {
    margin: 15px 0;
}

img {
    width: 260px;
    margin: 10px;
    border-radius: 15px;
    transition: 0.4s;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

img:hover {
    transform: scale(1.08) rotate(1deg);
}

#galeria img {
    width: 220px;
}

button {
    background: linear-gradient(45deg, #3399ff, #66ccff);
    border: none;
    color: white;
    padding: 12px 20px;
    border-radius: 25px;
    cursor: pointer;
    margin-top: 10px;
    transition: 0.3s;
    font-size: 15px;
}

button:hover {
    transform: scale(1.05);
    background: linear-gradient(45deg, #007acc, #33ccff);
}

input {
    padding: 10px;
    width: 250px;
    border-radius: 10px;
    border: 1px solid #ccc;
    margin-top: 10px;
    outline: none;
}

input:focus {
    border-color: #3399ff;
}

#resultado {
    margin-top: 15px;
    font-weight: bold;
    color: #007acc;
}

footer {
    background: #3399ff;
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: 20px;
}

.fade {
    opacity: 0;
    transform: translateY(30px);
    transition: all 1s ease;
}

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