/* ==========================================
   FORM REGISTRATION STYLING (DARK AUTOMOTIVE)
   ========================================== */
.form-card {
    background: #151c28;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 18px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
    overflow: hidden;
}

.form-card .card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    font-weight: 700;
}

.header-gold {
    background: linear-gradient(135deg, rgba(255, 183, 3, 0.15) 0%, rgba(251, 133, 0, 0.05) 100%);
    color: #ffb703;
    border-left: 4px solid #ffb703;
}

.header-green {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.15) 0%, rgba(5, 150, 105, 0.05) 100%);
    color: #10b981;
    border-left: 4px solid #10b981;
}

.header-blue {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.15) 0%, rgba(37, 99, 235, 0.05) 100%);
    color: #60a5fa;
    border-left: 4px solid #3b82f6;
}

/* Custom Input Controls */
.dark-input {
    background-color: #0b0f17 !important;
    border: 1px solid rgba(255, 255, 255, 0.12) !important;
    color: #ffffff !important;
    border-radius: 10px !important;
    padding: 0.75rem 1rem !important;
    transition: all 0.3s ease;
}

.dark-input:focus {
    border-color: #ffb703 !important;
    box-shadow: 0 0 12px rgba(255, 183, 3, 0.25) !important;
}

.dark-input::placeholder {
    color: #64748b !important;
}

.form-label {
    color: #cbd5e1;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
}

/* Custom Upload Drop Zone */
.upload-dropzone {
    border: 2px dashed rgba(255, 255, 255, 0.2);
    border-radius: 14px;
    background: #0b0f17;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
}

.upload-dropzone:hover {
    border-color: #ffb703;
    background: rgba(255, 183, 3, 0.02);
}

/* Checkerboard Background for PNG Transparency */
.checkerboard-bg {
    background: repeating-conic-gradient(#1e293b 0% 25%, #0f172a 0% 50%) 50% / 16px 16px;
    border: 2px dashed rgba(255, 183, 3, 0.4);
}