body { 
    background-color: #fcf9f5; 
    margin: 0; padding: 0;
    font-family: 'Poppins', sans-serif;
}

.res-header { 
    text-align: center; 
    padding: 80px 20px; 
    background: #4A3728; 
    color: #eae1d7; 
}

.res-header h1 {
    font-family: 'Playfair Display', serif;
    font-size: 3.5rem;
    margin: 0;
}

.res-container {
    max-width: 800px;
    margin: -50px auto 80px;
    background: white;
    padding: 50px;
    border-radius: 15px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.1);
    border-top: 6px solid #C5A059;
    position: relative;
    z-index: 10;
}

.res-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 25px;
}

.res-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 5px;
}

.full {
    grid-column: span 2;
}

.res-group label {
    font-weight: 700;
    color: #4A3728;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.res-group input {
    padding: 14px;
    border: 2px solid #f0f0f0;
    border-radius: 10px;
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    background: #fafafa;
    transition: all 0.3s ease;
}

.res-group input:focus {
    border-color: #C5A059;
    background: #fff;
    outline: none;
}

.error-msg {
    color: #C5A059; 
    font-size: 0.8rem;
    font-weight: 600;
    min-height: 18px;
}

input.invalid {
    border-color: #C5A059 !important;
    background-color: #fff9f0;
    animation: shake 0.3s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-4px); }
    75% { transform: translateX(4px); }
}

.res-btn {
    width: 100%;
    margin-top: 20px;
    padding: 20px;
    background: #4A3728;
    color: #eae1d7;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 700;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.3s ease;
}

.res-btn:hover {
    background: #C5A059;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

@media screen and (max-width: 768px) {
    .res-header h1 { font-size: 2.2rem; }
    .res-container { margin: 20px; padding: 30px 20px; }
    .res-grid { grid-template-columns: 1fr; }
    .full { grid-column: span 1; }
}