/* style.css */
.input-field {
    background: transparent;
    border: none;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    transition: all 0.4s ease;
    padding: 0.5rem 0;
}

.input-field:focus {
    outline: none;
    border-bottom: 1px solid #f97316; /* Orange-500 */
    padding-left: 10px;
}

.bg-grid {
    background-size: 40px 40px;
    background-image: radial-gradient(circle, #000000 1px, transparent 1px);
    opacity: 0.03;
}

.contact-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(0,0,0,0.05);
}

/* Custom Checkbox lạ mắt */
.type-selector input:checked + label {
    background-color: #1e293b;
    color: white;
    transform: translateY(-2px);
}
header {
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Trạng thái khi cuộn chuột (sẽ dùng JS thêm class này) */
header.scrolled {
    padding-top: 1.5rem;
    padding-bottom: 1.5rem;
    background-color: rgba(244, 241, 238, 0.8); /* Màu nền trùng với body nhưng trong suốt */
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}
.nav-link {
    position: relative;
    transition: color 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 1px;
    bottom: -2px;
    left: 0;
    background-color: #1A1A1A;
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}