/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Helvetica, Arial, sans-serif;
}

body {
    background: white;
    color: black;
    overflow-x: hidden;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    z-index: 1000;
}

.logo {
    font-size: 24px;
    font-weight: bold;
}

.nav a {
    margin-left: 32px;
    text-decoration: none;
    color: black;
    font-size: 15px;
    transition: opacity 0.3s ease;
}

.nav a:hover {
    opacity: 0.5;
}

/* Sections */
.section {
    padding: 120px 80px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* Home full-screen */
.full {
    background: white;
    text-align: center;
}

.title {
    font-size: 58px;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 20px;
    opacity: 0.7;
}

.btn {
    margin-top: 30px;
    padding: 12px 28px;
    border: 1px solid black;
    background: white;
    cursor: pointer;
    transition: all .3s;
    position: relative;
    overflow: hidden;
}

.btn:hover {
    transform: scale(1.05);
}

/* Fade-in */
.fade-in {
    opacity: 0;
    transform: translateY(40px);
    transition: all 1.2s ease;
}
.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Scale-in */
.scale-in {
    transform: scale(0.9);
}
.scale-visible {
    transform: scale(1);
}

/* Products */
.center-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 40px;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.product-card {
    border: 1px solid black;
    padding: 40px;
    transition: 0.4s;
    text-align: center;
    background: white;
    transform-style: preserve-3d;
}

.product-card:hover {
    transform: translateY(-10px) scale(1.03);
    box-shadow: 0 12px 20px rgba(0,0,0,0.1);
}

/* About */
.gray {
    background: #f5f5f5;
}

.text {
    width: 70%;
    margin: auto;
    text-align: center;
    font-size: 18px;
    opacity: 0.75;
    line-height: 1.5;
}

/* Footer */
.footer {
    text-align: center;
    padding: 40px 0;
    border-top: 1px solid #ccc;
    opacity: 0.7;
    margin-top: 40px;
}